阅读说明：本技术 磁性刺激装置 (Magnetic stimulation device ) 是由 森仁 八岛建树 加贺谷齐 出江绅一 于 2020-01-08 设计创作，主要内容包括：目的在于实现一种磁性刺激装置的实用化,该磁性刺激装置不仅能够应用于大型装置,也能够应用于小型化装置,能够使由通电时的发热引起的上升温度低于安全基准,能够实现许多次的连续磁性刺激。磁性刺激装置(A)包括磁芯(2)、导体(1b、1c(1b'、1c'))以及壳体(4)。磁芯(2)包括主体部分(2a)和从主体部分(2a)沿相同方向突出的腿部(2b、2c)。导体(1b、1c(1b'、1c'))以线圈状缠绕设置于腿部(2b、2c)各自的周围。壳体(4)为容纳磁芯(2)和导体(1b、1c)的容器。磁芯(2)的腿部(2b、2c)形成为与同时将所述腿部(2b、2c)横切的面(K)平行的该横截面积(Sb、Sc)从主体部分(2a)侧的基部(2k、2l)向着顶端(2s、2t)而逐渐变小。(The purpose is to realize a magnetic stimulation device which can be applied not only to a large-sized device but also to a small-sized device, and which can reduce the temperature rise due to heat generation during energization to below a safety standard, and which can realize continuous magnetic stimulation many times. The magnetic stimulation device (A) comprises a magnetic core (2), conductors (1b, 1c (1b ', 1c')) and a housing (4). The magnetic core (2) includes a main body portion (2a) and leg portions (2b, 2c) protruding in the same direction from the main body portion (2 a). Conductors (1b, 1c (1b ', 1c')) are wound in a coil shape around the respective leg portions (2b, 2 c). The case (4) is a container that houses the magnetic core (2) and the conductors (1b, 1 c). The leg portions (2b, 2c) of the magnetic core (2) are formed such that the cross-sectional areas (Sb, Sc) parallel to a plane (K) which intersects both the leg portions (2b, 2c) gradually decrease from the base portions (2K, 2l) on the main body portion (2a) side toward the tip portions (2s, 2 t).)

1. A magnetic stimulation device, comprising:

a magnetic core including a body portion and leg portions protruding in the same direction from the body portion;

a coil-shaped conductor wound around each of the leg portions; and

a housing containing the magnetic core and the conductor,

in the magnetic stimulation device, the leg portion is formed such that a cross-sectional area of the leg portion parallel to a plane intersecting the leg portion at the same time becomes gradually smaller from a base portion on the main body portion side toward a tip end.

2. The magnetic stimulation device of claim 1,

the interval between the opposite inner side surfaces of the leg portions is formed to gradually expand from the base portion toward the tip portion.

3. The magnetic stimulation device according to claim 1 or 2,

the magnetic core is formed of a laminate of thin plates, and the lamination surface is parallel to a surface obtained by slitting the body portion and both leg portions of the magnetic core at the same time.

4. A magnetic stimulation device according to any of claims 1-3,

cooling spaces through which cooling gas introduced into the case flows are provided between an inner surface of the leg and an opposing surface of the conductor wound around the leg and opposing the inner surface.

5. The magnetic stimulation device according to any one of claims 1 to 4,

the conductor is made of a wire rod wound by being divided into a plurality of layers from the tip of the leg portion toward the base portion,

the wires are connected for each layer that is contiguous.

6. The magnetic stimulation device according to any one of claims 1 to 4,

the conductor is made of a wire rod wound by being divided into a plurality of layers from the tip of the leg portion toward the base portion,

the wires of the layers of one leg portion from the distal end toward the base portion are connected in this order to the wires of the layers of the other leg portion from the base portion side toward the distal end.

7. The magnetic stimulation device according to any one of claims 1 to 4,

the conductor is composed of a wire material which is wound multiple times around each leg portion in a nested manner, so that a plurality of layers are wound inside and outside,

in the wire, the same layers are connected to each other on the corresponding inner side and outer side.

8. The magnetic stimulation device according to any one of claims 1 to 4,

the conductor is composed of a wire material which is multiply wound around each leg portion in a nested manner, so that a plurality of layers are wound inside and outside,

in the wire, for each layer, the corresponding outer wire is connected to the inner wire.

9. A magnetic stimulation device is characterized in that,

in a magnetic stimulation device comprising a magnetic core, a conductor, a fan for blowing air and a casing for accommodating the magnetic core, the conductor, the fan for blowing air and the casing for accommodating the fan for blowing air,

the magnetic core includes a main body portion and leg portions projecting from the main body portion in the same direction, the spacing between the opposing inner side surfaces of the leg portions being formed so as to gradually expand from the base portion toward the tip end thereof, and the magnetic core is constituted by a laminated body in which the planes of a plurality of thin plates are overlapped with each other,

conductors are wound around the respective legs in a coil shape,

the fan is disposed between the opposing inner side surfaces of the leg portions.

Technical Field

The present invention relates to a magnetic stimulation device used for repeatedly magnetically stimulating peripheral nerves or cerebral cortex motor regions of an affected part in order to enhance motor functions.

Background

At present, the number of quadriplegia patients due to stroke and spinal cord injury reaches 200 ten thousand, and the number is further increasing with the transition of age structure in japan. When paralysis continues for a long period due to brain damage, the function of the muscle is significantly reduced due to disuse syndrome, and recovery becomes difficult.

Rehabilitation based on motor therapy is considered to be the most important treatment method in order to prevent disuse syndrome caused by hemiplegia, quadriplegia and to actively recover the function of muscles.

In addition, dysphagia caused by sequelae of cerebrovascular disorder and aging has also become a social problem. Currently, most of pneumonia, which accounts for 7.2% of domestic causes of death, is aspiration pneumonia caused by dysphagia. As a rehabilitation method for dysphagia, rehabilitation based on motor therapy in which muscles associated with swallowing are repeatedly activated is mainly used.

One of the methods for inducing muscle movement by stimulating peripheral nerves and cerebral cortex motor regions is a magnetic stimulation method. This is the following method: a pulse current is caused to flow through a coil placed near the body surface, and the nerve is stimulated by an induced current induced in the body by a magnetic flux generated from the coil to move the muscle.

Patent document 1 discloses a technique of continuously bending a finger or an arm by magnetic stimulation, and shows that when magnetic stimulation is performed on nerves of an arm by repeating magnetic pulses at intervals of 10 milliseconds, the distance of arm bending increases as the number of pulses increases. However, since a large current is used in the magnetic stimulation device, the device temperature is likely to rise.

Patent document 2 discloses the following technique: in the magnetic stimulation device, the temperature rise of the coil and the core due to heat generation at the time of energization is reduced by air cooling, and continuous magnetic stimulation can be performed many times.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2010-166971

Patent document 2: japanese patent laid-open publication No. 2016-28640

Disclosure of Invention

Technical problem to be solved by the invention

The effect of the magnetic stimulation increases with the number of repetitions of the magnetic stimulation. Furthermore, in order to generate an effective magnetic stimulus, a large current of several hundred amperes or more needs to flow through the coil. Therefore, as described above, the magnetic stimulation by the continuous pulses has a problem that the coil generates heat and the temperature rises sharply, and the number of pulses cannot be increased to a predetermined value only by air cooling. The heating of the coil becomes a significant technical limitation for performing continuous magnetic stimulation.

In addition, there are limitations from the use environment for the magnetic stimulation device. The time that can be implemented in actual rehabilitation is limited to 20 minutes per unit of treatment, and even if preparation is included, the actual rehabilitation time is about 15 minutes. It is required to perform the required number of magnetic stimulations within this time. Currently, the required specifications require 60 magnetic pulses per magnetic stimulation and 100 magnetic stimulations in 15 minutes. If so, the desired magnetic pulse for substantially the healing time is 6000 shots. Furthermore, according to the safety standards of medical equipment, there is a standard of less than 43 ℃ for the surface temperature of equipment that is in contact with the skin of a patient for a long time, and it is naturally required that this standard is satisfied also for a small-sized magnetic stimulation device (for example, a jaw device described later).

As the magnetic stimulation device, there is a large device that magnetically stimulates muscles of large parts such as arms and legs, and the magnetic stimulation device is sometimes applied to the jaw. In addition, when applied to the jaw, women and the elderly also include patients with a small jaw in a certain proportion, and a smaller magnetic stimulation device is required.

When the shape of the device is made smaller, the coil is inevitably also made smaller, and the heat capacity thereof is reduced, resulting in a temperature rise of the coil. Further, making the coil smaller means making the magnitude of the magnetic flux smaller, and a higher magnetic flux density is required in order to obtain the same stimulation as that of a large-sized magnetic stimulation apparatus using the small coil. That is, a larger current is applied to a smaller coil, and therefore the temperature rise of the coil is further increased.

For the above reasons, it is difficult for the conventional magnetic stimulation apparatus to lower the surface temperature of the device to 43 ℃ or less, and the magnetic flux density has to be reduced. In particular, when the device is miniaturized, the surface temperature of the equipment rises sharply, and the device satisfying the above-described specifications cannot be miniaturized.

The present invention has been made in view of the above-described problems of the conventional art, and an object of the present invention is to realize a magnetic stimulation apparatus which can be applied to both large-sized and small-sized apparatuses, and which can perform continuous magnetic stimulation many times by lowering the temperature rise due to heat generation at the time of energization below a safety standard.

Claims for solving the technical problems

Claim 1 relates to an improvement of the magnetic core 2 of the magnetic stimulation device a (fig. 6).

The magnetic stimulation device a includes:

a magnetic core 2 including a main body portion 2a and leg portions 2b, 2c protruding in the same direction from the main body portion 2 a;

coiled conductors 1b and 1c (1b 'and 1c') wound around the respective leg portions 2b and 2 c; and

a housing 4 accommodating the magnetic core 2 and the conductors 1b, 1c,

in the magnetic stimulation apparatus a, the leg portions 2b and 2c are formed such that cross-sectional areas Sb and Sc parallel to a plane K intersecting both the leg portions 2b and 2c are gradually reduced from the base portions 2K and 2l on the main body portion 2a side toward the distal ends 2s and 2 t.

Claim 2 further defines the magnetic core 2 of claim 1.

Characterized in that, in the magnetic stimulation device A of claim 1,

the interval L between the opposing inner side surfaces 2m, 2n of the leg portions 2b, 2c is formed so as to gradually increase from the base portions 2k, 2L toward the distal ends 2s, 2 t.

Claim 3 relates to the direction of lamination of the thin plates 3 constituting the magnetic core 2 (fig. 7).

In the magnetic stimulation device A of claim 1 or 2,

the magnetic core 2 is composed of a laminated body of thin plates 3, and the laminated surface is parallel to a surface M obtained by slitting the body portion 2a and the leg portions 2b, 2c of the magnetic core 2 at the same time.

Claim 4 relates to a housing 4 of a magnetic stimulation device A,

in the magnetic stimulation device A according to any one of claims 1 to 3,

cooling spaces 81 through which the cooling gas 6 introduced into the housing 4 flows are provided between the inner surfaces 2m, 2n of the legs 2b, 2c and the facing surfaces of the conductors 1b, 1c wound around the legs 2b, 2c and facing the inner surfaces 2m, 2n, respectively.

Claim 5 relates to a conductor 1b, 1c (straight connection configuration of embodiment 1: fig. 11) configuration of a magnetic stimulation device a, characterized in that,

in the magnetic stimulation device A according to any one of claims 1 to 4,

the conductors 1b, 1c are constituted by wire members 1b 1-1 bn/1c 1-1 cn which are wound in a plurality of layers (stages) divided from the tips 2s, 2t of the legs 2b, 2c toward the bases 2k, 2l,

the wires 1b 1-1 bn/1c 1-1 cn are connected for each adjacent layer (stage).

Claim 6 relates to conductors 1b, 1c of a magnetic stimulation device A (cross-connect configuration of embodiment 1: FIG. 12), characterized in that,

in the magnetic stimulation device A according to any one of claims 1 to 4,

the conductors 1b, 1c are constituted by wire members 1b 1-1 bn/1c 1-1 cn which are wound in a plurality of layers (stages) divided from the tips 2s, 2t of the legs 2b, 2c toward the bases 2k, 2l,

the wire members 1b 1-1 bn of each layer (stage) of one leg 2b from the tip 2s toward the base 2k and the wire members 1c 2-1 cn of each layer (stage) of the other leg 2c are connected in this order from the base 2l side toward the tip 2 t.

Claim 7 relates to conductors 1b ', 1c' of a magnetic stimulation device A (straight connection configuration of embodiment 2: FIG. 13), characterized in that,

in the magnetic stimulation device A according to any one of claims 1 to 4,

the conductors 1b 'and 1c' are formed of wires 1b1 'to 1bn'/1c1 'to 1cn', and the wires 1b1 'to 1bn'/1c1 'to 1cn' are respectively wound in a nested manner in multiple turns around the respective leg portions 2b and 2c so as to be wound in multiple turns inside and outside,

the wire members 1b1 'to 1bn'/1c1 'to 1cn' are connected to each other on the corresponding inner side and outer side for each same layer.

Claim 8 relates to conductors 1b ', 1c' of a magnetic stimulation device A (cross-connect configuration of embodiment 2: FIG. 14), characterized in that,

in the magnetic stimulation device A according to any one of claims 1 to 4,

the conductors 1b 'and 1c' are formed of wires 1b1 'to 1bn'/1c1 'to 1cn', and the wires 1b1 'to 1bn'/1c1 'to 1cn' are wound in a multiple manner around the respective leg portions 2b and 2c in a nested manner, so that a plurality of layers are wound inside and outside,

of the wire members 1b1 'to 1bn'/1c1 'to 1cn', the corresponding outer wire member is connected to the inner wire member for each layer.

Claim 9 relates to the overall structure of the magnetic stimulation device A,

in a magnetic stimulation device A comprising a magnetic core 2, conductors 1b and 1c, a fan 5 for blowing air and a case 4 for accommodating them,

the magnetic core 2 includes a main body portion 2a and leg portions 2b, 2c, the leg portions 2b, 2c project from the main body portion 2a in the same direction, a space L between opposed inner side surfaces 2m, 2n of the leg portions 2b, 2c is formed so as to gradually expand from base portions 2k, 2L thereof toward tip portions 2s, 2t, and the magnetic core 2 is constituted by a laminated body in which planes of a plurality of thin plates 3 are overlapped with each other,

conductors 1b, 1c are wound around the respective leg portions 2b, 2c in a coil shape,

the fan 5 is disposed between the opposing inner side surfaces 2m, 2n of the leg portions 2b, 2 c.

Effects of the invention

In the magnetic core 2 of the present invention, the leg portions 2b and 2c are formed such that the cross-sectional areas Sb and Sc of the leg portions 2b and 2c are gradually reduced from the base portions 2k and 2l of the main body portion 2a toward the distal ends 2s and 2t, so that leakage of the magnetic flux G between the magnetic poles from the distal end portions can be suppressed, and the magnetic flux density effective for the treatment, which is generated from the distal ends 2s and 2t, can be kept constant, and the temperature rise of the conductors 1b and 1c (1b 'and 1c') can be suppressed (fig. 6). In order to avoid complication, the conductors 1b and 1c (1b 'and 1c') may be simply referred to as the conductor 1.

In addition, since a space is created between the inclined side surfaces of the leg portions 2b, 2c and the conductor 1, the cooling gas 6 enters the space when flowing therethrough to effectively cool the leg portions 2b, 2 c.

In the above description, if the interval L between the opposing inner surfaces 2m, 2n of the legs 2b, 2c is formed so as to gradually increase from the base portions 2k, 2L toward the distal ends 2s, 2t, the magnetic flux density of the magnetic flux G1 generated from the portions on the opposing inner surfaces 2m, 2n side of the distal ends 2s, 2t is reduced as compared with the case where the interval L is not increased, and the magnetic flux G3 generated from the outer portions of the distal ends 2s, 2t on the opposite side is deeper than the case where the interval L is not increased. As a result, strong magnetic stimulation is applied to the deep part of the affected part (the movement point P of the muscle to be treated), and weak magnetic stimulation is applied to the shallow part of the affected part such as the skin, thereby reducing the discomfort of the patient (fig. 3).

When the plane (laminated surface) of the thin plate 3 of the magnetic core 2 is laminated in parallel with the plane M intersecting both the main body portion 2a and the leg portions 2b and 2c, the eddy current U to be generated in the leg portions 2b and 2c is suppressed by the interlayer insulation of the leg portions 2b and 2c, and the temperature rise of the leg portions 2b and 2c is suppressed (fig. 9).

In the case 4, if the cooling spaces 81 are provided between the inner surfaces 2m and 2n of the legs 2b and 2c and the conductors 1 wound around the legs 2b and 2c, respectively, the legs 2b and 2c can be cooled more efficiently by the cooling gas 6 from the fan 5 (fig. 8).

In the structure of the conductor 1, if the conductor 1 is divided into a plurality of layers (stages) in the longitudinal direction of the legs 2b and 2c or a plurality of layers are formed in the direction of overlapping, the current density of each layer is averaged, and the local temperature rise is suppressed.

In this case, when the connection of the respective layers is "cross-connection", unlike "straight-line connection", the electromotive force generated in the coil on the tip side (inner side) and the electromotive force generated in the coil on the base side (outer side) in the opposite direction cancel each other out, and the temperature rise of the conductor 1 is suppressed more effectively.

Then, by combining these (the shape of the core 2, the lamination direction, the cooling method, and the structure of the conductor 1), the temperature rise of the conductor 1 and the core 2 can be suppressed to be less than the limit value even with miniaturization, and the magnetic flux density and the number of times of stimulation at the level necessary for the treatment can be secured.

Drawings

Fig. 1 is a perspective view of the magnetic stimulation device of the present invention as viewed from the cover side.

Fig. 2 is a plan sectional view showing the internal configuration of fig. 1 viewed from the cover portion side.

Fig. 3 is a cross-sectional view X-X of fig. 2.

Fig. 4 (a) is a central longitudinal sectional view of the magnetic stimulation device of the present invention, fig. 4 (b) is a perspective view of the magnetic core, and fig. 4 (c) is a perspective view of another magnetic core.

Fig. 5 is a perspective view of a thin plate constituting the magnetic core of the present invention.

Fig. 6 is a perspective view showing a horizontal section of a leg portion of the magnetic core of the present invention.

Fig. 7 is a perspective view showing the lamination direction of thin plates of the magnetic core of the present invention.

Fig. 8 (a) is a diagram showing an arrangement relationship between the magnetic core of the present invention and a conductor, and fig. 8 (b) is a diagram showing an arrangement relationship between the magnetic core of the present invention and another conductor.

Fig. 9 is a diagram showing a relationship between eddy current and magnetic flux between magnetic poles in fig. 8.

Fig. 10 is a schematic diagram (single coil) of the wiring configuration of the conductor of the present invention.

Fig. 11 (a) is a schematic view of a wiring structure of conductors (a linear connection structure of embodiment 1), and fig. 11 (b) is a schematic front view thereof.

Fig. 12 (a) is a schematic view of a wiring structure of conductors (cross-connection structure of embodiment 1), and fig. 12 (b) is a schematic front view thereof.

Fig. 13 (a) is a schematic view of a wiring structure of conductors (a linear connection structure of embodiment 2), and fig. 13 (b) is a schematic front view thereof.

Fig. 14 (a) is a schematic view of a wiring structure of conductors (cross-connection structure of embodiment 2), and fig. 14 (b) is a schematic front view thereof.

Fig. 15 is a graph showing the relationship between the opening angle of the opposed inner surfaces of the core of the present invention and the electrical stimulation of two sites of the affected area.

Reference numerals

A: a continuous magnetic stimulation device; G. g1, G3: a magnetic flux; l: the spacing between the inner sides; K. m: kneading; p: a motion point; θ: an opening angle; 1. 1b, 1c (1b ', 1 c'): a conductor; 1b 1-1 bn/1c 1-1 cn (1b1 '-1 bn'/1c1 '-1 cn'): coils (layers, stages); 2: a magnetic core; 2 a: a body portion; 2b, 2 c: a leg portion; 2k, 2 l: a base; 2m, 2 n: (opposite) medial side; 2s, 2 t: a top end; 3: a thin plate; 3 a: a thin plate; 3b, 3 c: the leg portion constitutes a tab; 4: a housing; 6: cooling gas (air); 7: a cooling mechanism; 7 b: a fan; 10b, 10 c: an exciting current supply line; 41: a cover portion; 42: a magnetic flux generating surface; 43: a convex portion; 44: an air outlet; 45: an electric wire mounting part; 46: a housing main body: 47: an air suction port; 48: a bottom; 49: a handle; 50: a feed wire; 51: a support member; 81: a cooling space; 83: a suction space; 84: a fan receiving space.

Detailed Description

Next, the details of the present invention will be described based on embodiments. Further, this embodiment is for easy understanding by those skilled in the art. That is, it should be understood that the present invention is limited only by the technical idea described in the entire specification of the present invention, and is not limited to the present embodiment.

The continuous magnetic stimulation apparatus a of the present invention includes a conductor 1, a magnetic core 2, a housing 4, and a cooling mechanism 7. The conductor 1 is wound in a coil shape around the left and right leg portions 2b and 2c of the core 2.

The magnetic core 2 is U-shaped, and includes a rectangular or cubic main body portion 2a and leg portions 2b, 2c, the leg portions 2b, 2c projecting in the same direction from opposite side end portions in a line-symmetrical manner on the same plane of the main body portion 2 a. The magnetic core 2 is a laminated body of thin plates 3 described later.

The leg portions 2b and 2c are shaped such that the cross-sectional areas Sb and Sc cut by a plane K (for example, a horizontal plane) parallel to the main body portion 2a and intersecting the leg portions 2b and 2c gradually decrease toward the distal ends 2s and 2 t.

The embodiment shown in fig. 4 (b) is an example of a leg shape, the opposing inner side surfaces 2m, 2n of the legs 2b, 2c are configured to be flat, and the interval L between the surfaces 2m, 2n is formed to gradually increase from the bases 2k, 2L toward the tips 2s, 2 t. The opening angle between the opposing inner side surfaces 2m, 2n is represented by "θ" (fig. 5).

Specifically, the leg shape is a truncated prism (pyramid) or a trapezoidal solid in front view in which the outer side surface is vertical and the opposing inner side surface (plane) is inclined so as to become wider upward.

The embodiment shown in fig. 4 (c) is another example of a leg shape, and the opposing inner side surfaces 2m, 2n are bulged inward. In the example of the figure, the tip 2s and the tip 2t are divided into three parts by ridge lines parallel to each other. The respective divided inner surfaces are denoted by 2m1, 2m2, 2m3/2n1, 2n2, and 2n 3. Needless to say, the division into three parts is an example, and a curved surface having an arc-shaped longitudinal section (i.e., a curved surface obtained by cutting a part of a cylinder: not shown) which bulges inside may be used. By forming the shape in this manner, a stronger stimulus can be applied to the inside than in the case where the opposing inner side surfaces 2m, 2n are flat. That is, when the opposed inner side surfaces 2m, 2n of the core 2 are expanded inward, the magnetic flux density at the thick base portions 2k, 2l of the core 2 becomes less likely to be saturated, and the magnetic flux density inside until the distal ends 2s, 2t of the core 2 is maintained at a high state. As a result, the magnetic flux density at the core distal ends 2s and 2t becomes stronger.

The magnetic core 2 is formed of a laminated body in which a plurality of thin plates 3 of rolled silicon steel plates having a thin insulating coating film shown in fig. 5 are laminated. The thickness of the rolled silicon steel plate used in this example was 0.35 mm. One example thereof is a thin plate 3 shown in fig. 5.

As shown in fig. 7, the thin plates 3 are laminated in parallel with a plane M (for example, a vertical plane) that intersects both the main body 2a and the legs 2b and 2c of the core 2 (in other words, the planes of the thin plates 3 are overlapped). Therefore, as shown in fig. 5, the sheet 3 has a substantially U-shape in which two leg-constituting projecting pieces 3b and 3c extend in the same direction from one side of the sheet main body 3a, and the inner opposing edges thereof are formed so that the interval gradually increases from the base toward the tip. The opening angle is represented by θ.

In the core 2, the distribution of the magnetic flux G generated from the distal ends 2s and 2t of the legs 2b and 2c changes according to the opening angle θ. That is, as shown in fig. 3, when the opposed inner side surfaces 2m and 2n of the leg portions 2b and 2c are opened, the magnetic flux G1 generated from the tip portions on the opposed inner side surfaces 2m and 2n side becomes weaker than that when the opening angle θ is set to 0, and the magnetic flux G3 generated from the outer portions of the opposite tip portions 2s and 2t goes deeper than that when the opening angle θ is set to 0. As a result, as shown in fig. 3, the stimulation to the shallow part of the body becomes weak, and the moving point P deep in the body is stimulated more strongly.

Now, when the moving point P in the deep body is set to a depth of 20mm from the skin surface and the position of the epidermal nociceptor present in the skin is set to a depth of 1mm, the opening angle θ is set to a range of 9.1 ° to 17.7 °, preferably to a range of 13.5 ° ± 2 ° according to fig. 15. Here, the depth from the skin surface is Z.

The above θ is 9.1 ° and is the intensity of the magnetic stimulus at the depth Z of 20mm (induced current density a/m at the depth of 20 mm)²That is, the intensity of the eddy current in this portion) starts to become flat, and θ becomes 17.7 ° at which both of them sharply decrease. The peak is reached at 13.5 °. The intensity of the magnetic stimulus at the depth Z of 20mm shows a flat value in the range of θ 9.1 ° to 17.7 °. The magnetic stimulus drops sharply when it exceeds 17.7 °.

Further, since the maximum magnetism of the depth Z of 20mm is included in θ ═ 13.5 ° ± 2 °Intensity of stimulus (A/m)²) And remains substantially constant, this range is therefore the most appropriate opening angle theta.

The magnetic stimulus at a depth of 1mm decreases constantly as the opening angle θ becomes larger. In the above range, the irritation to the skin is slightly reduced as compared with the case where the opening angle θ is 0.

Further, in FIG. 15, the left vertical axis shows the induced current density A/m at a depth of 20mm from the skin²The right vertical axis shows the induced current density A/m at a depth of 1mm²The horizontal axis shows the opening angle θ (degrees) of the opposing inner surfaces 2m and 2n of the core 2.

The wire material as the material of the conductor 1 is a long flat copper plate (ribbon) having a rectangular or square cross section, and the conductor 1 is formed by winding the wire material around the legs 2b and 2c of the magnetic core 2 in a coil shape. This conductor 1 is sometimes also referred to as a coil. An insulating coating is formed on the surface of the conductor 1.

The conductor 1 is wound in a close-wound shape so that coils on the inner peripheral side and the outer peripheral side, and on the upper stage side and the lower stage side, respectively, are in contact with each other. (needless to say, a coil cooling space (not shown) may be provided so as to be not in contact with the inside and outside of the coil cooling space, and the coil cooling space may be wound around the coil cooling space)

As the insulating coating of the conductor 1, a urethane resin is used, and the insulating coating is formed to be thin so as not to hinder heat dissipation from the surface of the conductor 1. In the present embodiment, the thickness of the insulating coating is set to 20 μm.

There are two types of wire materials used for the conductor 1, and 1 is a case of using a flat wire material (tape) having 1 wide covering almost the entire leg portions 2b and 2c as shown in fig. 8 (a), and a flat wire material having a narrow upper and lower width as shown in fig. 8 (b). In this case, a plurality of flat wires are wound in multiple layers and multiple layers around the leg portions 2b and 2 c. There are 3 kinds of winding states of the wire rod constituting the conductor 1 to the leg portions 2b, 2 c. As will be described later, there are two connection methods of the conductors 1b and 1c (1b 'and 1c') formed of a plurality of flat wires wound around the leg portions 2b and 2c, respectively. (instead of the flat wire having a narrow upper and lower width, a wire having a circular cross section may be used.)

(winding state of wire rod constituting conductor 1 to leg parts 2b, 2c)

In the case of the 1 st embodiment, as shown in fig. 8 (a) and 10, 1 wire rod having a large vertical width is wound in multiple turns around the leg portions 2b and 2c from the inside toward the outside, the outermost coils are connected to each other, and the innermost coils are connected to the excitation current supply lines 10b and 10c, respectively. This is called a "single coil".

In cases 2 and 3, as shown in fig. 8 (b), a plurality of flat wires having narrow widths at the top and bottom are wound around the leg portions 2b and 2c in the top and bottom direction in a plurality of layers (in multiple stages or in a nested manner). These coils are referred to as "parallel coils" and "multiple coils".

That is, the wire rod constituting the conductor 1 is wound around the leg portions 2b and 2c in 3 patterns of "single coil", "parallel coil", and "multiple coil".

The "parallel coil" of the above-mentioned 2 includes a coil composed of two upper and lower layers shown in fig. 3 and 4, a coil composed of a plurality of layers (multi-stage) shown in fig. 11 and 12, and the like.

The "multiple coil" of the above-mentioned 3 is used in a case where a plurality of flat wire members having narrow upper and lower widths as shown in fig. 13 and 14 are wound in a radial direction around the leg portions 2b and 2c in a plurality of layers (multiple layers). In other words, the inner and outer coils are wound around the legs 2b and 2c in a nested state.

In any of the "single coil", "parallel coil" and "multiple coil" winding directions of the wire rod with respect to the leg portions 2b and 2c, the winding is performed such that the direction n(s) of the magnetic field with respect to one leg portion 2b and the direction s (n) of the magnetic field with respect to the other leg portion 2c are opposite directions. That is, when the conductor 1b of one leg portion 2b is wound in the clockwise direction, the conductor 1c of the other leg portion is wound in the counterclockwise direction (fig. 10 to 14).

Next, a connection structure of each stage or layer of the wire material of the "parallel coil" or the "multiple coil" will be described. Fig. 11 and 13 show the connection structure of the wire rods of the "parallel coil" and the "multiple coil", which is referred to as a "linear connection structure". In contrast, fig. 12 and 14 show other connection structures of the wire materials of the "parallel coil" and the "multiple coil", and the connection structure is referred to as a "cross connection structure". The description is given separately.

In the "straight line connection structure (fig. 11)" of the "parallel coils", the outermost coils of the same upper and lower layers (i.e., adjacent layers) 1b1/1c1 to 1bn/1cn are connected to each other to form 1 wire, and the ends of the innermost coils of the same layers are collected and connected to the excitation current supply lines 10b and 10c, respectively.

In the cross-connection structure (fig. 12) of the "parallel coil", the outermost coils 1b1/1c1 of the 1 st layer (stage) on the top ends 2s and 2t side and the coils 1bn/1cn of the n-th layer on the base portions 2k and 2l side are cross-connected to form 1 wire, and the outermost coils 1b2/1c2 of the 2 nd layer and the coils 1b (n-1)/1 c (n-1) of the n-1 th layer are connected to form 1 wire. The following is the same. In this case, the coils of the different layers are connected. Then, the ends of the innermost coil are connected to the excitation current supply lines 10b and 10c, respectively, together.

In the "linear connection structure (fig. 13)" of the "multiple coil", the 1 st wire rod is wound several turns from the tip 2s toward the base 2k along the outer peripheral surface of one leg portion 2 b. The innermost coil is denoted by 1b 1'.

Next, the 2 nd wire rod is wound so as to overlap the 1 st coil 1b1' as the innermost layer. In the case of n layers, they are wound in a nested manner. The outermost coil is denoted by 1 bn'.

Similarly, the remaining portions of the 1 st to nth wires are sequentially wound around the outer peripheral surface of the other leg portion 2c in a nested manner. These coils are denoted by 1c1 'to 1 cn'.

At the innermost circumference, the coils 1b1'/1c1' at the innermost circumference are connected to each other, the coils of the same overlapping layer are sequentially connected to each other, and at the outermost circumference, the coils 1bn '/1cn' at the outermost circumference are connected to each other. Then, the coil ends of the legs 2b and 2c are connected to the excitation current supply lines 10b and 10c, respectively.

The cross-connection structure (fig. 14) of the "multiple coils" is the same as the above-described nested structure, but the wiring structure is different.

Then, the innermost coil 1b1 'on the base 2k side of the one leg 2b is connected to the outermost coil 1cn' on the tip 2t side of the other leg 2c, and becomes 1 wire. Similarly, the 2 nd inner layer coil 1b2 'on the base 2k side of the one leg portion 2b is connected to the coil 1c (n-1)' on the outermost tip 2t side of the other leg portion 2 c. The coil 1bn 'of the nth inner layer, which is the outermost layer on the base 2k side of the one leg portion 2b, is connected to the coil 1c1' on the distal end 2t side of the innermost layer of the other leg portion 2 c. Then, the ends of the coils wound around the legs 2b and 2c are connected to the excitation current supply lines 10b and 10c, respectively.

In the embodiment of fig. 8, the relationship between the legs 2b and 2c and the conductors 1b and 1c is such that right triangle-shaped spaces are formed between the inner surfaces of the conductors 1b and 1c and the inner surfaces of the opposing inner surfaces 2m and 2n inclined outward of the legs 2b and 2c, respectively, and increase in the directions of the distal ends 2s and 2 t. This space is used as a cooling space 81.

The shape of the leg portions 2b and 2c may be such that the outer side surfaces of the leg portions 2b and 2c are inclined inward as approaching the distal ends 2s and 2t, although not shown, in addition to the above-described case where the opposing inner side surfaces 2m and 2n are inclined outward. In this case, the aforementioned right-triangle-shaped space is generated on the outer side surface side of the leg portions 2b and 2 c. Further, inclined surfaces may be provided on both the opposing inner side surfaces 2m, 2n and the outer side surfaces of the leg portions 2b, 2c, and the triangular space may be generated along both the inner and outer side surfaces of the leg portions 2b, 2 c.

Further, since the insulating coating is formed on the surface of the conductor 1 as described above, the conductor 1 itself as a whole generates less heat as described later, and therefore, it is not particularly necessary to provide a cooling gap between the conductors 1, which has been conventionally required, and they can be wound in close contact with each other. The cooling gap between the conductors 1 is provided only when particularly required. In the drawing of fig. 4, the upper and lower coils and the inner and outer coils are drawn exaggeratedly so that a gap is formed therebetween, but there is substantially no gap.

The case 4 is a unit made of resin (here, made of ABS) that houses the magnetic core 2, the coil-shaped conductor 1, and a cooling fan 5 and the like that constitute a part of the cooling mechanism 7. The case 4 is formed of a case main body 46 having an open upper surface, and a lid 41 and a handle 49 covering the opening, and is fixed by bolts not shown, and the upper surface opening is closed.

The handle 49 is provided on the bottom 48 of the housing main body 46 so as to extend rearward of the housing 4. An air inlet 47 leading to the internal space is provided in the front surface of the casing main body 46.

On the magnetic flux generating surface 42 of the cover 41 which is in contact with the affected part of the patient, quadrangular (rectangular) convex portions 43 which are outwardly bulged are formed at two positions in parallel and extend in the front-rear direction of the housing 4. The inner surface of the convex portion 43 is formed in a shallow concave shape corresponding to the convex portion 43. The tips 2s and 2t (fig. 3) of the leg portions 2b and 2c of the magnetic core 2 are fitted into the concave portions on the inner surface side of the rectangular convex portions 43.

Further, an air outlet 44 having a horizontally long slit is provided to penetrate the front surface of the cover 41 in multiple stages in the vertical direction. The air outlet 44 is provided to match the space between the leg portions 2b and 2c of the magnetic core 2. Then, a wire attachment portion 45 is provided on the back surface of the cover portion 41 so as to project rearward. The feed wire 50 is connected to the wire mounting portion 45.

The magnetic core 2 accommodated in the case 4 is pressed against the lid portion 41 by the support 51 via the column portion erected on the bottom portion 48 of the case main body 46. Then, a suction space 83 connected to the suction port 47 is provided between the support 51 and the bottom 48.

Then, in the fan housing space 84 on the back surface side of the core 2, the air intake space 83 is connected to the cooling space 81 on the exhaust side.

The fan 5 is provided in the fan housing space 84 on the back surface side of the magnetic core 2. The cooling mechanism 7 is constituted by the air inlet 47, the cooling space 81, the fan housing space 84, the air inlet space 83, the air outlet 44, and the fan 5. (instead of fan 5, an air supply hose (not shown) may be connected to air inlet 47.)

Next, the operation of the present apparatus a will be explained. The present apparatus a used is referred to as a "single coil" shown in fig. 8 (a) and 10, and the other description will be centered on a difference from the "single coil".

In fig. 10, when an exciting current (pulse current or alternating current) is supplied from one exciting current supply line 10b, the exciting current flows in the counterclockwise direction through the conductor 2b wound around the one leg portion 2b, then flows in the clockwise direction through the conductor 1c wound around the other leg portion 2c, and flows to the other exciting current supply line 10 c.

Accordingly, the magnetic pole of the distal end 2S of one leg portion 2b is S, and the magnetic pole of the distal end 2S of the other leg portion 2c is N. When the flow of the exciting current in one direction is completed, the exciting current is inverted, and the exciting current in the opposite direction flows from the other exciting current supply line 10c, flows in the clockwise direction through the conductor 1c wound around the other leg portion 2c, then flows in the counterclockwise direction through the conductor 1b wound around the one leg portion 2b, and flows to the one exciting current supply line 10 b. Accordingly, the magnetic pole at the distal end 2S of the other leg portion 2c is S, the magnetic pole at the distal end 2t of the one leg portion 2b is N, and the magnetic poles are reversed. The above process is repeated at a predetermined cycle. A magnetic flux G is generated between the two distal ends 2s, 2t of the core 2.

Among the generated magnetic fluxes G, a magnetic flux G3 reaching deeper than the opening angle θ of 0 acts on the deep part of the affected part (in the figure, below the jaw), and a magnetic flux G1 weakened than the opening angle θ of 0 acts on the skin. Then, as this effect, an increased eddy current U3 is generated in the depth, and a decreased eddy current U1 is generated in the skin, and this portion is magnetically stimulated.

In this case, the legs of the conventional magnetic core are prisms having a constant cross-sectional area, and therefore leakage of magnetic flux between the magnetic poles between the legs occurs toward the tip. Therefore, local eddy currents are generated in the portions of the conductor 1 on the distal ends 2s and 2t sides by the leakage magnetic flux, and the temperature of the portions rises to the limit value or more.

Since the leg portions 2b and 2c of the core 2 of the present apparatus a are formed such that the cross-sectional areas Sb and Sc gradually decrease from the base portions 2k and 2l on the main body portion 2a side toward the tip end, leakage of magnetic flux between the magnetic poles from the inner side surface of the tip end portion is suppressed. As a result, no eddy current U is generated in the conductor 1, and the temperature increase in the portion on the tip side of the conductor 1 is suppressed. At the same time, since the above-described leakage of magnetic flux can be suppressed, the density of magnetic flux generated from the distal ends 2s and 2t can be kept constant. This reduces energy loss and contributes to miniaturization of the device.

In particular, when the opposed inner side surfaces 2m and 2n of the legs 2b and 2c are open as shown in fig. 3, the density of the magnetic flux G1 generated from the tip portions on the opposed inner side surfaces 2m and 2n side is lower than that at the opening angle θ of 0 as described above, and the depth to which the magnetic flux G3 generated from the tip portions on the opposite side, i.e., the outer side, reaches becomes deeper, so that stronger magnetic stimulation can be applied to deeper portions (the movement point P of the muscle to be treated) than at the opening angle θ of 0, and weak magnetic stimulation can be applied to shallow portions of the affected area such as the skin, and therefore, the discomfort given to the patient can be reduced.

Accordingly, the jaw muscle (or arm muscle) can be greatly contracted without causing pain during training, and effective training of muscles of the arm and the swallowing can be achieved.

In the magnetic core 2, if the thin plates 3 are laminated such that the planes of the thin plates 3 overlap each other, that is, if the laminated surface (plane) of the magnetic core 2 is laminated in parallel with a plane (vertical plane) M intersecting the main body portion 2a and the leg portions 2b and 2c at the same time, the direction of the magnetic flux between the legs 2b (2c) and the legs 2c (2b) is perpendicular to the lamination direction of the thin plates 3 when the conductors 1b and 1c are energized, and therefore, the magnetic core is cut by the interlayer insulation (insulation film of the thin plates 3) of the leg portions 2b and 2c, and the generation of the eddy current U is suppressed (fig. 9). As a result, the temperature rise of the leg portions 2b and 2c is suppressed.

Then, during the energization, the cooling mechanism 7 continues to operate (i.e., the air supply and the air discharge are performed by the fan 5 and the air supply hose), and the cooling gas (air) 6 flows into the intake space 83 through the intake port 47 and is sent to the cooling space 81 by the fan 5. The cooling air 6 flowing through the cooling space 81 directly contacts the legs 2b and 2c of the conductor 1 and the magnetic core 2, takes heat of the legs 2b and 2c of the conductor 1 and the magnetic core 2, and is discharged from the outlet 44 to the outside.

Since the front and rear of the cooling space 81 are closed by the conductor 1, the cooling air 6 collides with the conductor 1 to generate sufficient turbulence in the cooling space 81, and as a result, a high cooling effect is exhibited.

As described above, by improving the lamination direction and shape of the magnetic core 2 and the cooling structure, the device temperature is lower than the reference 43 ℃ even in the case where magnetic pulses are continuously generated for 15 minutes (the total number of pulses of 6000) at room temperature of 25 ℃, and the risk of heat generation to the patient can be prevented.

Next, the relationship between the improvement of the wire structure and the suppression of temperature rise will be described, in addition to the above-described improvements.

In the case of a "monocoil" as shown in fig. 8 (a), when an excitation current flows, the inductance of the core 2 on the tip side is locally lower than the inductance on the base side as described above. Therefore, the excitation current flows while being concentrated on the top end side portions of the conductors 1b and 1c having a wide vertical width facing the top end portions of the legs 1b and 1 c. As a result, in the case of the "monocoil", the temperature rise of the device is suppressed by improving the lamination direction and shape of the magnetic core 2 centering on the air cooling.

The improvement of the conductors 1b, 1c for suppressing the temperature rise thus obtained will be described. In this case, if the conductors 1b and 1c are divided into a plurality of layers (stages) in the longitudinal direction of the leg portions 2b and 2c or a plurality of layers are formed in the radial direction, concentration of the current density in the portions on the distal end 2s and 2t sides is alleviated unlike in the case of the "single coil", the current density of each layer is averaged, and the temperature rise of each layer is further suppressed. Hereinafter, the operation will be briefly described.

When an excitation current is applied to the conductors 1b and 1c, an N pole (S pole) appears at the tip 2S of one leg 2b, and an S pole (N pole) opposite thereto appears at the tip 2t of the other leg 2c, and the polarities are alternately switched, thereby generating a magnetic flux G between the two poles. This aspect is common in the present invention.

(straight line construction of parallel coils: FIG. 11)

In the 1 st wiring structure (straight-line structure of parallel coils), the inductance of the tip portions of the leg portions 2b, 2c is smaller than the inductance of the portions of the base portions 2k, 2l at the time of energization. Therefore, in the coils 1b1/1c 1-1 bn/1cn wound around the legs 2b, 2c, the excitation current decreases from the distal ends 2s, 2t side toward the base portions 2k, 2l side. That is, a larger amount of excitation current flows through the 1 st layer 1b1/1c1 wound around the tip portions of the legs 2b and 2c than through the following layers 1b2 to 1bn/1c2 to 1cn on the base portions 2k and 2l side. However, in this case, compared to a "single coil" of a band-shaped integral structure that is long in the longitudinal direction and wide in the width direction, since the conductors 1b and 1c are divided into a plurality of wire rods, variations in current density are reduced.

In the magnetic core 2 of the present invention, as described above, magnetic flux leakage from between the magnetic poles between the leg portions 2b and 2c is greatly suppressed, and therefore, the generation of eddy current in the conductor layers 1b1 to 1bn/1c1 to 1cn is reduced.

As a result, the "straight-line structure of parallel coils" reduces variations in current density as compared with the "single coil", and therefore, heat generation of the conductors 1b and 1c is greatly suppressed as compared with the "single coil".

(Cross structure of parallel coils: FIG. 12)

Next, a 2 nd wiring structure (a crossing structure of parallel coils) of embodiment 1 will be explained (fig. 12). When the excitation current is caused to flow through the conductors 1b and 1c, the excitation current slightly flows toward the 1 st layer 1b1/1c1 due to the inductance, but the excitation current is less likely to flow through the n-th layer 1bn/1cn connected to the base 2k and 2l side of the 1 st layer 1b1/1c1 than through the 1 st layer 1b1/1c1, and therefore the n-th layer 1bn/1cn becomes a limiting factor and the excitation current flowing through the 1 st layer 1b1/1c1 is suppressed. In other words, the excitation current flowing through the 1 st layer 1b1/1c1 is the same as that of the n-th layer 1bn/1 cn. Accordingly, the excitation current suppressed substantially uniformly as a whole flows through the conductors 1 of the respective layers. As a result, heat generation can be more suppressed than in the 1 st wiring structure.

Further, "straight wiring" and "cross wiring configuration" are applied as the (parallel coil) including the upper and lower two-layer configurations of fig. 3 and 4.

(Linear structure of multiple coils: FIG. 13)

Next, the 1 st wiring structure (the linear structure of the multiple coils) of embodiment 2 will be explained. As described above, the conductors 1b 'and 1c' are formed by winding the wires constituting the conductors 1b 'and 1c' in a plurality of turns so as to be in close contact with the leg portions 2b and 2c, the wires having different diameters from a large diameter to a small diameter. That is, the wires with small diameters of the conductors 1b 'and 1c' are arranged inside the wires with large diameters in a nested state. Then, similarly to the "linear structure" of embodiment 1, the wire rods of the conductor layers 1b1 'to 1bn' constituting one leg portion 2b 'are connected in parallel to the wire rods of the conductor layers 1c1' to 1cn 'constituting the other leg portion 2c', respectively.

When current is passed to the conductors 1b '/1c', excitation current flows downward (or upward) from above the legs 2b and 2c to below the inner and outer conductor layers 1b1'— 1bn'/1c1'— 1 cn'. At this time, as described above, the base-side portions of the leg portions 2b and 2c in the respective conductor layers 1b1 'to 1bn'/1c1 'to 1cn' become the limiting factors due to the inductance relationship, and the variation in current density is eliminated to a considerable extent.

(Cross structure of multiple coils: FIG. 14)

In the 2 nd connection structure (multiple coil crossing structure) of embodiment 2, the innermost 1 st layer 1b1 'wound in multiple fashion around the one leg portion 2b is connected to the outermost n-th layer 1cn' of the other leg portion 2c, and the outermost n-th layer 1bn 'of the one leg portion 2b is connected to the innermost 1 st layer 1c1' of the other leg portion 2c, in reverse order.

As described above, the inductance of the tip portions of the legs 2b and 2c is smaller than the inductance of the base portion side at the time of energization, and the influence is more significant as the layer is located radially inward of the tip portions.

In other words, when comparing the top end portions of the 1 st layer 1b1'/1c1' with the top end portions of the outermost layer 1bn '/1cn', the 1 st layer 1b1'/1c1' is greatly affected. As a result, the excitation current flowing through the 1 st layer 1b1'/1c1' is slightly stronger than that of the outermost layer 1bn '/1 cn'. Therefore, in this case of the reverse connection, the base side of the n-th layer 1bn '(1cn') having the smallest influence of inductance becomes the limiting factor, and the temperature rise can be suppressed more favorably with less variation in current density.

As described above, when the connection of the layers is "cross-connection", the electromotive force generated in the wire on the distal end side (inner side) and the electromotive force generated in the wire on the proximal end side (outer side) in the opposite direction cancel each other out as compared with the "straight-line connection", and the temperature rise of the conductors 1b and 1c is suppressed more.

As described above, by improving the wiring structure in addition to the lamination direction and shape of the magnetic core 2 and the cooling structure, it is possible to realize 100 times (6000 shots) of magnetic stimulation in 6 minutes and 40 seconds, which are significantly shorter than the standard 15 minutes, by using a small magnetic stimulation apparatus a for a patient having a small jaw, for example. This can significantly reduce the burden on the patient and the therapist.

The claims (modification according to treaty clause 19)

1. A magnetic stimulation device, comprising:

a magnetic core including a body portion and leg portions protruding in the same direction from the body portion;

a coil-shaped conductor wound around each of the leg portions; and

a housing containing the magnetic core and the conductor,

in the magnetic stimulation apparatus, the interval between the opposing inner side surfaces of the leg portions is formed so as to gradually increase from the base portion toward the tip end, and the leg portions are formed so that the cross-sectional areas of the leg portions, which are parallel to the surfaces that simultaneously intersect the leg portions, gradually decrease from the base portion on the main body portion side toward the tip end.

2. The magnetic stimulation device of claim 1,

the magnetic core is formed of a laminate of thin plates, and the lamination surface is parallel to a surface obtained by slitting the main body portion and the leg portions of the magnetic core at the same time.

3. The magnetic stimulation device according to claim 1 or 2,

cooling spaces through which cooling gas introduced into the case flows are provided between an inner surface of the leg and an opposing surface of the conductor wound around the leg and opposing the inner surface.

4. A magnetic stimulation device according to any of claims 1-3,

the conductor is made of a wire rod wound by being divided into a plurality of layers from the tip of the leg portion toward the base portion,

the wires are connected for each layer that is contiguous.

5. A magnetic stimulation device according to any of claims 1-3,

the conductor is made of a wire rod wound by being divided into a plurality of layers from the tip of the leg portion toward the base portion,

the wires of the layers of one leg portion from the distal end toward the base portion are connected in this order to the wires of the layers of the other leg portion from the base portion side toward the distal end.

6. A magnetic stimulation device according to any of claims 1-3,

the conductor is composed of a wire material which is wound multiple times around each leg portion in a nested manner, so that a plurality of layers are wound inside and outside,

in the wire, the same layers are connected to each other on the corresponding inner side and outer side.

7. A magnetic stimulation device according to any of claims 1-3,

the conductor is composed of a wire material which is multiply wound around each leg portion in a nested manner, so that a plurality of layers are wound inside and outside,

in the wire, for each layer, the corresponding outer wire is connected to the inner wire.

8. A magnetic stimulation device is characterized in that,

in a magnetic stimulation device comprising a magnetic core, a conductor, a fan for blowing air and a casing for accommodating the magnetic core, the conductor, the fan for blowing air and the casing for accommodating the fan for blowing air,

the magnetic core includes a main body portion and leg portions projecting from the main body portion in the same direction, the spacing between the opposing inner side surfaces of the leg portions being formed so as to gradually expand from the base portion toward the tip end thereof, and the magnetic core is constituted by a laminated body in which the planes of a plurality of thin plates are overlapped with each other,

conductors are wound around the respective legs in a coil shape,

the fan is disposed between the opposing inner side surfaces of the leg portions.