阅读说明：本技术 一种防切出髓内钉 (Anti-cutting out intramedullary nail ) 是由 王鑫 史春宝 郭静 王振国 岳术同 李正戎 于 2021-08-30 设计创作，主要内容包括：本发明提供一种防切出髓内钉,包括：主钉,其近端上沿其宽度方向贯穿有一固定孔；螺旋刀片,其尾部开设有倾斜的锁定螺钉孔；锁钉,通过所述锁钉依次插入所述锁定螺钉孔、所述固定孔以将所述主钉、所述螺旋刀片连接固定。其优点是：通过锁钉将主钉、螺旋刀片连接固定的方式,使得三者之间构成稳定的三角形结构,有效地防止了螺旋刀片沿轴向或径向发生切出,使得螺旋刀片在股骨颈中的位置不发生改变,避免股骨头或股骨颈发生损坏,提高骨折复位的质量。(The invention provides an anti-resection intramedullary nail, comprising: the near end of the main nail is provided with a fixing hole along the width direction; the tail part of the spiral blade is provided with an inclined locking screw hole; and the locking nail is sequentially inserted into the locking screw hole and the fixing hole so as to connect and fix the main nail and the spiral blade. The advantages are that: the main nail and the spiral blade are connected and fixed through the locking nail, so that a stable triangular structure is formed among the main nail, the spiral blade and the spiral blade, the spiral blade is effectively prevented from being cut out along the axial direction or the radial direction, the position of the spiral blade in the femoral neck is not changed, the femoral head or the femoral neck is prevented from being damaged, and the quality of fracture reduction is improved.)

1. An anti-resection intramedullary nail, comprising: comprises that

The main nail (1) is provided with a fixing hole (11) which penetrates through the near end along the width direction;

the tail part of the spiral blade (2) is provided with an inclined locking screw hole (21);

the locking screw (3) is sequentially inserted into the locking screw hole (21) and the fixing hole (11) to fixedly connect the main screw (1) and the spiral blade (2).

2. The anti-resection intramedullary nail of claim 1, wherein: the angle formed between the proximal end of the main nail (1) and the distal end of the main nail (1) conforms to the physiological anatomical structure of the femur.

3. The anti-resection intramedullary nail of claim 2, wherein: an angle alpha formed between the central axis of the near end of the main nail (1) and the central axis of the far end of the main nail (1) is 5-7 degrees.

4. The anti-resection intramedullary nail of claim 1, wherein: the near end of the main nail (1) is provided with a spiral blade hole (12) for inserting the spiral blade (2), and the inclination angle beta formed between the spiral blade hole (12) and the near end of the main nail (1) is 125-135 degrees.

5. The anti-resection intramedullary nail of claim 1, wherein: the locking nail (3) is of an external thread structure.

6. The anti-resection intramedullary nail of claim 1, wherein: the fixing hole (11) and the locking screw hole (21) are threaded holes.

7. The anti-resection intramedullary nail of claim 1, wherein: the cross section of the structure among the main nail (1), the spiral blade (2) and the locking nail (3) forms a right-angled triangle.

8. The anti-resection intramedullary nail of claim 7, wherein: the main nail (1) is vertically connected with the locking nail (3).

9. The anti-resection intramedullary nail of claim 1, wherein: the main nail (1) is of a hollow structure.

Technical Field

The invention relates to the technical field of medical treatment, in particular to an anti-cutting intramedullary nail.

Background

The spiral blade of the existing APFN intramedullary nail is designed in an integrated mode, and after the spiral blade is driven into a femoral neck by a driver, in order to ensure the stability of the spiral blade in the intramedullary nail, a locking device at the tail of a main nail needs to be screwed in to fix the spiral blade. However, under the action of the pressure conducted by the hip joint, the connection stability of the spiral blade is not high, and the spiral blade is easy to cut out along the axial direction or the radial direction, so that the position of the spiral blade in the femoral neck is changed, the quality of fracture reduction is influenced, even the femoral head or the femoral neck is damaged, secondary fracture is caused or intramedullary fixation is failed, and larger physiological and economic burden is caused to a patient.

Disclosure of Invention

The invention provides an anti-cutting intramedullary nail, which aims to overcome at least one technical defect and improve the stability of the intramedullary nail.

In order to achieve the above purpose, the invention provides the following technical scheme:

an anti-resection intramedullary nail comprising: the near end of the main nail is provided with a fixing hole along the width direction;

the tail part of the spiral blade is provided with an inclined locking screw hole;

and the locking nail is sequentially inserted into the locking screw hole and the fixing hole so as to connect and fix the main nail and the spiral blade.

Preferably, the angle formed between the proximal end of the main nail and the distal end of the main nail conforms to the femoral anatomy.

Preferably, the angle α formed between the proximal mid-axis of the main nail and the distal mid-axis of the main nail is 5-7 °.

Preferably, the proximal end of the main nail is provided with a spiral blade hole for inserting the spiral blade, and the inclination angle β formed between the spiral blade hole and the proximal end of the main nail is 125-135 °.

Preferably, the locking nail is of an external thread structure.

Preferably, the fixing hole and the locking screw hole are both threaded holes.

Preferably, the cross-section of the configuration among the main nail, the helical blade and the locking nail is formed with a right-angled triangle.

Further, the main nail is vertically connected with the locking nail.

Preferably, the main nail is of a hollow structure.

The anti-cutting-out intramedullary nail has the advantages that: the fixing hole is formed in the near end of the main nail, the locking screw hole is formed in the tail portion of the spiral blade, and the main nail and the spiral blade are connected and fixed through the locking nail, so that a stable triangular structure is formed among the main nail, the spiral blade and the spiral blade, the spiral blade is effectively prevented from being cut out along the axial direction or the radial direction, the position of the spiral blade in the femoral neck is not changed, the femoral head or the femoral neck is prevented from being damaged, and the quality of fracture reduction is improved;

in addition, the structural design of the invention can effectively reduce the physiological and economic burden of the patient.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 and fig. 2 are schematic views of three-dimensional structures of different viewing angles of an anti-cutting intramedullary nail according to the present invention;

FIG. 3 is a partial cross-sectional structural view of an anti-resection intramedullary nail of the present invention;

FIG. 4 is a schematic perspective view of the main nail;

FIG. 5 is a cross-sectional structural view of the main nail;

FIG. 6 is an enlarged view of a portion of the structure of FIG. 5;

FIG. 7 is a schematic structural view of a helical blade;

FIG. 8 is a schematic cross-sectional view of a helical blade;

wherein:

1-main nail, 11-fixing hole, 12-spiral blade hole, 2-spiral blade, 21-locking screw hole, 22-connecting threaded hole and 3-locking nail.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In a specific embodiment, as shown in fig. 1-3, an anti-resection intramedullary nail of the present invention comprises: a fixing hole 11 is penetrated through the near end of the main nail 1 along the width direction; the tail part of the spiral blade 2 is provided with an inclined locking screw hole 21; the locking screw 3, through the locking screw 3 inserts in proper order locking screw hole 21 the fixed orifices 11 is in order to incite somebody to action main nail 1 spiral blade 2 is connected fixedly, makes main nail 1 spiral blade 2 the cross section of structure is formed with right-angled triangle-shaped between the locking screw 3, because triangular stability, has improved main nail 1 with spiral blade 2 connection structure's stability.

In particular implementation, the main nail 1 is vertically connected with the locking nail 3 so as to enhance the stability between the main nail 1 and the spiral blade 2; the main nail 1 is a hollow structure to reduce the burden on a patient after implantation while ensuring the strength thereof.

In a specific embodiment, in order to facilitate implantation from the vertex of the greater trochanter of femur, according to fig. 5 and 6, an angle formed between the proximal end of the main nail 1 and the distal end of the main nail 1 conforms to the physiological anatomical structure of femur, further, an angle α formed between the central axis of the proximal end of the main nail 1 and the central axis of the distal end of the main nail 1 is 5 to 7 °, so that the operation is simple, and the influence on the blood circulation of femur is small, and further, the angle α formed between the central axis of the proximal end of the main nail 1 and the central axis of the distal end of the main nail 1 is 6 ° to further conform to the physical characteristics of chinese people.

In a specific embodiment, in order to conform to the physiological anatomical structure of the femur of a Chinese person, according to fig. 4 and 5, the distal end of the main nail 1 has a physiological curvature to improve the fitting degree with the medullary cavity, reduce the resistance of the main nail 1 during insertion, prevent the main nail 1 from contacting and impacting the cortex of the femur, and effectively avoid stress concentration caused by the intramedullary nail;

in order to conform to the physiological anatomical structure of the femoral neck of the Chinese, as shown in fig. 5, a spiral blade hole 12 for inserting the spiral blade 2 is formed at the proximal end of the main nail 1, and an inclination angle β formed between the spiral blade hole 12 and the proximal end of the main nail 1 is 125-135 °; preferably, the inclination angle beta formed between the helical blade hole 12 and the proximal end of the main nail 1 is 130 degrees;

according to fig. 7 and 8, the spiral blade 2 adopts an integral hollow core design to ensure the strength of the spiral blade 2;

the tail part of the spiral blade 2 is also provided with a connecting threaded hole 22 connected with a remover, so that the difficulty in driving and removing is avoided.

In a specific implementation process, the locking nail 3 is of an external thread structure; the fixing hole 11 and the locking screw hole 21 are threaded holes, so that the screw threads among the locking nail 3, the main nail 1 and the spiral blade 2 can be effectively prevented from being axially and radially cut out, and the possibility of secondary fracture and fixation failure is reduced.

The structures not shown or described in detail in the drawings of the present invention are conventional technologies and thus will not be described in detail.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.