阅读说明：本技术 一种虚拟头颅模型自然头位的定位装置及其定位方法 (Positioning device and positioning method for natural head position of virtual skull model ) 是由 王琳 吴国民 陈楷 谢昆鹏 胡向锦 庞婉毓 史红丽 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种虚拟头颅模型自然头位的定位装置及其定位方法,属于临床医学技术领域,包括弧形面弓、电磁铁自动描记笔及支架；弧形面弓固定在多个支架的顶端,支架的高度可调节,弧形面弓上均匀固定有多个电磁铁自动描记笔。使用前,将电磁铁自动描记笔笔尖涂抹X线显影糊剂,通电后笔芯压缩,使用时,嘱患者调整至自然头位状态,将弧形面弓调整至患者眶下平面高度并使笔尖距离皮肤一厘米；断电,笔芯被弹簧弹出,电磁铁自动描记笔伸长并在患者眶下部描记可在X线下显影的标记点,自然头位记录完成。虚拟头颅模型自然头位的精准确定装置的应用为正颌外科手术术前数字化设计时虚拟头颅模型的自然头位确定提供了更加精准和科学的保障。(The invention discloses a positioning device and a positioning method for a natural head position of a virtual skull model, belonging to the technical field of clinical medicine and comprising an arc-shaped face bow, an electromagnet automatic tracing pen and a bracket; the arc face bow is fixed on the top ends of the plurality of supports, the height of the supports can be adjusted, and a plurality of electromagnet automatic tracing pens are uniformly fixed on the arc face bow. Before use, smearing X-ray developing paste on the pen point of the automatic tracing pen of the electromagnet, compressing the pen core after electrifying, when in use, advising a patient to adjust to a natural head position state, adjusting the arc face bow to the height of the infraorbital plane of the patient and enabling the pen point to be one centimeter away from the skin; when the power is off, the pen core is ejected by the spring, the electromagnet automatically traces the pen to extend and trace the marking point which can be developed under X-ray on the lower part of the orbit of the patient, and the recording of the natural head position is finished. The application of the accurate determination device for the natural head position of the virtual head model provides more accurate and scientific guarantee for the natural head position determination of the virtual head model during the preoperative digital design of orthognathic surgery.)

1. A virtual skull model natural head position positioning device is characterized by comprising an arc-shaped face bow (1), an electromagnet automatic tracing pen (2) and a support (3); the bottom of support (3) is fixed in the level subaerial, and arc face bow (1) is fixed on the top of a plurality of supports (3), and the height-adjustable of support (3) is evenly fixed with a plurality of electro-magnet automatic tracing pens (2) on arc face bow (1), realizes the location to the natural head position of human body through electro-magnet automatic tracing pen (2).

2. The positioning device for the natural head position of the virtual skull model according to claim 1, characterized in that the arc-shaped face bow (1) consists of a semi-arc-shaped sliding rail (4) and a base (5); the base support (5) is located at the end part of the semi-circular arc-shaped sliding rail (4), the universal level meter (7) is placed in the base support (5), and the screw hole (6) is formed in the edge of the base support (5) and is used for being in threaded connection with the universal level meter (7).

3. The device for positioning the natural head position of the virtual skull model according to claim 2, wherein the upper surface of the semi-circular arc-shaped slide rail (4) is provided with a notch, an arc-shaped slide block (8) is arranged in the notch, the arc-shaped slide block (8) can freely slide in the inner groove structure of the semi-circular arc-shaped slide rail (4), the bottom of the arc-shaped slide block (8) is provided with a fixing screw (9), and after the arc-shaped slide block (8) slides to a proper position, the fixing screw (9) can be screwed down to fix the arc-shaped slide block (8) and the semi-circular arc-shaped slide rail (4).

4. The device for positioning the natural head position of the virtual skull model according to claim 3, wherein the top of the arc-shaped sliding block (8) is slidably connected in the hollow sliding rail (10), the side of the hollow sliding rail (10) is provided with a fixing screw (11), and after the hollow sliding rail (10) slides to a proper position, the fixing screw (11) can be screwed down to fix the arc-shaped sliding block (8) and the hollow sliding rail (10).

5. The virtual skull model natural head position positioning device according to claim 4, characterized in that the upper surface of the hollow slide rail (10) is connected with the electromagnet automatic tracing pen (2) by a fixing screw (12), and the electromagnet automatic tracing pen (2) is composed of a pen cap (13), a metal pen core (14), a rubber pen point (16), a spring (17) and an electromagnet (18); the inside of pen cap (13) is the cavity structure, is provided with metal refill (14) in the cavity structure, and pen cap (13) is worn out to the front end of metal refill (14), and metal refill (14) that are located the cavity structure is equipped with electro-magnet (18) and spring (17) from back to front cover in proper order, still is provided with round protruding structure (19) on the front end that is located spring (17), metal refill (14), protruding structure (19) card is at the inner wall of pen cap (13), outside being used for preventing that metal refill (14) from being released pen cap (13) by spring (17), the front end of metal refill (14) is connected with rubber nib (16) through knob (15).

6. The virtual skull model natural head positioning device according to claim 1, wherein the support (3) is a telescopic structure composed of an inner rod (20) and an outer rod (22) sleeved outside the inner rod (20), the inner rod (20) and the outer rod (22) are connected and fixed through a fixing knob (21), and the bottom of the outer rod (22) is connected with a base (23); the inner rod (20) is of a bent structure and is L-shaped, the end part of the inner rod (20) is connected with a universal joint (24), the universal joint (24) is connected with a connecting device (26) through a rotating screw (25), and the other end of the connecting device (26) is connected with the arc-shaped face bow (1) through a fixing screw (27).

7. The positioning device for the natural head position of the virtual skull model according to claim 3, characterized in that the arc-shaped sliding block (8) is composed of an upper structure and a lower structure, and the width of the upper structure is matched with the width of the inner side of the hollow sliding rail (10); the lower structure is arc-shaped, the radian of the lower structure is matched with that of the semi-arc-shaped slide rail (4), and the width of the lower structure is matched with the inner diameter of a notch of the semi-arc-shaped slide rail (4); the upper structure of the arc-shaped sliding block (8) can enable the hollow sliding rail (10) of the automatic electromagnet tracing pen (2) to freely slide on the arc-shaped sliding block (8), and the lower structure can freely slide in the semi-circular arc-shaped sliding rail (4).

8. The device for positioning the natural head position of the virtual skull model according to claim 1, characterized in that the number of the brackets (3) is three, and the brackets are uniformly arranged below the arc-shaped face bow (1); the number of the electromagnet automatic tracing pens (2) is five, and the electromagnet automatic tracing pens are uniformly arranged in an inner groove structure of the arc-shaped face bow (1).

9. A virtual skull model natural head position positioning device method is characterized by comprising the following steps:

the method comprises the following steps: firstly, adjusting the height of a bracket according to the height of a patient, and then screwing a fixing knob so as to enable an arc-shaped face bow positioned at the top end of the bracket to be positioned at the position under the orbit of the patient, thereby ensuring that the lower part of the orbit of the patient and a pen point of an automatic tracing pen of an electromagnet are in the same level; after the arc-shaped sliding block in the arc-shaped face bow is adjusted to reach a proper position, the arc-shaped sliding block is fixed on the semi-arc-shaped sliding rail by using a fixing screw; according to the indication of the universal level gauge on the arc-shaped face bow, the height of the bracket and the angle of the universal joint are adjusted, so that the whole arc-shaped face bow is in a horizontal position;

step two: then, according to the sizes of the skull of different patients, the pen cap slides back and forth on the arc-shaped sliding block, so that the rubber pen point is adjusted to be in right contact with the face of the patient, X-ray developing paste is smeared on the rubber pen point of the automatic electromagnet tracing pen for standby, a power supply is turned on to electrify the electromagnet, the metal pen core is adsorbed by magnetic force to compress the spring, and the automatic electromagnet tracing pen is in a contraction state at the moment, so that the rubber pen point is one centimeter away from the face of the patient;

step three: then the patient is adjusted to the natural head position, the face of the patient enters the arc face bow, the power supply of the electromagnet is disconnected, the spring is released, the metal pen core is simultaneously popped up by the spring, and the electromagnet automatically traces the pen to extend and traces the marking point which can be developed under the X-ray on the lower part of the orbit of the patient; the protruding part of the metal pen core is arranged, so that the metal pen core is prevented from being excessively stretched to cause damage to a patient;

step four: from this, the patient's face traces a plurality of marker points and the natural head recording is completed.

Technical Field

The invention belongs to the technical field of clinical medicine, and particularly relates to a positioning device and a positioning method for a natural head position of a virtual skull model.

Background

The Natural Head Position (NHP) is distinguished from the intracranial reference plane, the extracranial water reference plane. NHP was introduced in the research field of morphology of human maxillofacial regions in the fifties of the twentieth century, is currently recognized as the head position that most shows aesthetic expression in the natural state of human, and is the best reference for evaluating facial appearance. The standard definition of natural head bits is: when the main body of the figure is upright and in a completely relaxed state, and two eyes horizontally watch eyes at infinity in front or in a mirror surface without any external interference, the head of the main body is in a standard, stable and repeatable physiological position, and the real conditions of the head, the jaw, the surface and the neck of an individual in a natural living state are reflected. According to different acquisition modes, the NHP includes recording a natural head position (i.e., a natural, upright, and upright position of the head after the subject to be tested self-adjusts in a natural relaxation state) and evaluating the natural head position (i.e., an experienced natural head position in which the head of the patient is adjusted to be in a natural, upright, and upright position by subjective recognition of a trained doctor). Although one of them is subjective feeling of the subject itself and the other is subjective feeling of the examiner to the subject, they essentially mean the same head position. By definition, the determination capacity for evaluating the natural head position is easily influenced by subjective factors of doctors, and the acquisition of the recorded natural head position is more objective. Nowadays, NHPs are used as clinical routine examination items in orthognathic surgery, orthodontic surgery, prosthodontic surgery, and maxillofacial surgery, and are involved in diagnosis of diseases, preparation of treatment plans, monitoring of treatment processes, and evaluation of treatment effects.

Today, orthognathic surgery has fully entered the digital age. The preoperative design of the orthognathic surgery abandons the traditional two-dimensional head shadow analysis and model surgery approaches, and enters the digital era of three-dimensional computer-aided design. At this time, the positioning of the virtual skull model is the problem that is first solved before the orthognathic surgeon performs surgical planning. Currently, the acquisition of cranial information is generally by cone beam CT or helical CT. During cone beam CT scanning, it is necessary to immobilize the patient's head against movement due to the relatively long scan times (twenty to forty seconds). This is usually done with a chin rest, headband, but these devices not only deform the soft facial tissues but also affect the recording of NHPs. During helical CT scanning, the patient is in a supine position with the head randomly oriented in the CT coordinate system, and thus, in clinical practice, a typical CT image does not reflect the NHP of the patient. The existing solution is to record after NHP determination by wearing a sensor with a positioning function (gyroscope, level device, inclinometer or bubble air device). But the head accessory inevitably brings discomfort to the tested person or brings extra weight to the head, thereby causing the NHP recording to be inaccurate, and further influencing the accuracy of the preoperative digital design to different degrees.

Disclosure of Invention

The invention aims to accurately record the natural head position of a patient before CT data is acquired, and provides a positioning device and a positioning method of the natural head position of a virtual skull model, so that the position of the virtual skull model is accurately positioned to the natural head position state before digital design, and accurate and scientific guarantee is provided for the subsequent digital design.

The invention is realized by the following technical scheme:

a virtual skull model natural head position positioning device comprises an arc-shaped face bow 1, an electromagnet automatic tracing pen 2 and a support 3; the bottom of support 3 is fixed in the level subaerial, and arc face bow 1 is fixed on the top of a plurality of supports 3, and the height-adjustable of support 3 evenly is fixed with a plurality of electro-magnet automatic tracing pens 2 on the arc face bow 1, realizes the location to the natural head position of human body through electro-magnet automatic tracing pen 2.

Furthermore, the arc-shaped face bow 1 consists of a semi-arc-shaped slide rail 4 and a base 5; the base support 5 is positioned at the end part of the semi-circular arc-shaped slide rail 4, the universal level meter 7 is placed in the base support 5, and the edge of the base support 5 is provided with a screw hole 6 for being in threaded connection with the universal level meter 7.

Further, the upper surface of the semi-circular arc-shaped slide rail 4 is provided with a notch, an arc-shaped slide block 8 is arranged in the notch, the arc-shaped slide block 8 can freely slide in the inner groove structure of the semi-circular arc-shaped slide rail 4, a fixing screw 9 is arranged at the bottom of the arc-shaped slide block 8, and after the arc-shaped slide block 8 slides to a proper position, the fixing screw 9 can be screwed up to fix the arc-shaped slide block 8 and the semi-circular arc-shaped slide rail 4.

Further, the top of the arc-shaped sliding block 8 is connected in the hollow sliding rail 10 in a sliding manner, the side of the hollow sliding rail 10 is provided with a fixing screw 11, and after the hollow sliding rail 10 slides to a proper position, the fixing screw 11 can be screwed down to fix the arc-shaped sliding block 8 and the hollow sliding rail 10.

Further, the upper surface of the hollow slide rail 10 is connected with an electromagnet automatic tracing pen 2 through a fixing screw 12, and the electromagnet automatic tracing pen 2 consists of a pen cap 13, a metal pen core 14, a rubber pen point 16, a spring 17 and an electromagnet 18; the inside of the pen cap 13 is of a cavity structure, a metal pen core 14 is arranged in the cavity structure, the front end of the metal pen core 14 penetrates out of the pen cap 13, the metal pen core 14 located in the cavity structure is sequentially sleeved with an electromagnet 18 and a spring 17 from back to front, a circle of protruding structures 19 are further arranged at the front end of the spring 17 and on the metal pen core 14, the protruding structures 19 are clamped on the inner wall of the pen cap 13 to prevent the metal pen core 14 from being pushed out of the pen cap 13 by the spring 17, and the front end of the metal pen core 14 is connected with a rubber pen point 16 through a rotating button 15.

Furthermore, the support 3 is a telescopic structure composed of an inner rod 20 and an outer rod 22 sleeved outside the inner rod 20, the inner rod 20 and the outer rod 22 are fixedly connected through a fixing knob 21, and the bottom of the outer rod 22 is connected with a base 23; the inner rod 20 is of a bent structure and is L-shaped, the end part of the inner rod 20 is connected with a universal joint 24, the universal joint 24 is connected with a connecting device 26 through a rotating screw 25, and the other end of the connecting device 26 is connected with the arc-shaped face bow 1 through a fixing screw 27.

Furthermore, the arc-shaped sliding block 8 is composed of an upper part structure and a lower part structure, and the width of the upper part structure is matched with the width of the inner side of the hollow sliding rail 10; the lower structure is arc-shaped, the radian of the lower structure is matched with that of the semi-arc-shaped slide rail 4, and the width of the lower structure is matched with the inner diameter of the notch of the semi-arc-shaped slide rail 4; the upper structure of the arc-shaped sliding block 8 can enable the hollow sliding rail 10 of the automatic electro-magnet tracing pen 2 to freely slide on the arc-shaped sliding block 8, and the lower structure can freely slide in the semi-circular arc-shaped sliding rail 4.

Further, the number of the brackets 3 is three, and the brackets are uniformly arranged below the arc-shaped face bow 1; the number of the electromagnet automatic tracing pens 2 is five, and the electromagnet automatic tracing pens are uniformly arranged in the inner groove structure of the arc-shaped face bow 1.

The invention also aims to provide a method for positioning the natural head position of the virtual skull model, which specifically comprises the following steps:

the method comprises the following steps: firstly, adjusting the height of a bracket according to the height of a patient, and then screwing a fixing knob so as to enable an arc-shaped face bow positioned at the top end of the bracket to be positioned at the position under the orbit of the patient, thereby ensuring that the lower part of the orbit of the patient and a pen point of an automatic tracing pen of an electromagnet are in the same level; after the arc-shaped sliding block in the arc-shaped face bow is adjusted to reach a proper position, the arc-shaped sliding block is fixed on the semi-arc-shaped sliding rail by using a fixing screw; according to the indication of the universal level gauge on the arc-shaped face bow, the height of the bracket and the angle of the universal joint are adjusted, so that the whole arc-shaped face bow is in a horizontal position;

step two: then, according to the sizes of the skull of different patients, the pen cap slides back and forth on the arc-shaped sliding block, so that the rubber pen point is adjusted to be in right contact with the face of the patient, X-ray developing paste is smeared on the rubber pen point of the automatic electromagnet tracing pen for standby, a power supply is turned on to electrify the electromagnet, the metal pen core is adsorbed by magnetic force to compress the spring, and the automatic electromagnet tracing pen is in a contraction state at the moment, so that the rubber pen point is one centimeter away from the face of the patient;

step three: then the patient is adjusted to the natural head position, the face of the patient enters the arc face bow, the power supply of the electromagnet is disconnected, the spring is released, the metal pen core is simultaneously popped up by the spring, and the electromagnet automatically traces the pen to extend and traces the marking point which can be developed under the X-ray on the lower part of the orbit of the patient; the protruding part of the metal pen core is arranged, so that the metal pen core is prevented from being excessively stretched to cause damage to a patient;

step four: from this, the patient's face traces a plurality of marker points and the natural head recording is completed.

Compared with the prior art, the invention has the following advantages:

the positioning device and the positioning method for the natural head position of the virtual skull model solve the problem that the natural head position is transferred to the virtual model so as to accurately determine the natural head position of the virtual skull model before digital design. Before use, the pen point of the electromagnet automatic tracing pen is coated with proper X-ray developing paste in advance, the electromagnet is electrified, the pen core is adsorbed by magnetic force to compress the spring, and at the moment, the electromagnet automatic tracing pen is in a contraction state. When the multifunctional face-bow pen is used, a patient is ordered to adjust to a natural head position state, the arc-shaped face bow is adjusted to the height of the infraorbital plane of the patient according to the height of the patient and the size of the skull, and the five pen points are simultaneously away from the skin by one centimeter. The power supply of the electromagnet is disconnected, the five pen cores are simultaneously ejected by the spring, and the electromagnet automatic tracing pen extends simultaneously and traces five marking points which can be developed under X-rays at the lower part of the orbit of the patient. At this point, the natural header recording is complete. Then, the patient whose face is traced with the mark points is ordered to shoot the craniomaxillofacial spiral CT, at the moment, CT data not only contains the craniomaxillofacial bone and soft tissue information of the patient, but also carries the natural head position information of the patient. When a virtual skull model is built later, the natural head position can be accurately determined according to the mark points. The application of the accurate determination device for the natural head position of the virtual head model provides more accurate and scientific guarantee for the natural head position determination of the virtual head model during the preoperative digital design of orthognathic surgery.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1: the invention embodiment 1 describes a three-dimensional structure diagram of a virtual skull model natural head position positioning device;

FIG. 2: embodiment 1 of the invention virtual skull model natural head position accurate determination device of the semi-circular arc slide rail of the three-dimensional structure sketch map;

FIG. 3: embodiment 1 of the invention virtual skull model natural head position accurate determination device universal level instrument three-dimensional structure sketch map;

FIG. 4: embodiment 1 of the invention virtual skull model natural position accurate determination device electromagnet automatic tracing pen three-dimensional structure sketch map;

FIG. 5: the invention embodiment 1 virtual skull model natural head position accurate determination device electromagnet automatic tracing pen structure schematic side bitmap;

FIG. 6: embodiment 1 of the invention is a three-dimensional structure schematic diagram of a bracket of a device for accurately determining the natural head position of a virtual skull model;

FIG. 7: embodiment 1 of the invention virtual skull model natural head position accurate determination device support and arc face bow connection position three-dimensional structure sketch map;

FIG. 8: the invention embodiment 1 describes a detail three-dimensional structure diagram of a virtual skull model natural head position positioning device;

the names of the parts in the figure are: the automatic drawing pen comprises an arc-shaped face bow 1, an electromagnet automatic drawing pen 2, a support 3, a semi-arc-shaped slide rail 4, a base 5, a screw hole 6, a universal level meter 7, an arc-shaped slide block 8, a fixing screw 9, a hollow slide rail 10, a fixing screw 11, a fixing screw 12, a pen cap 13, a metal pen core 14, a rotary button 15, a rubber pen point 16, a spring 17, an electromagnet 18, a protruding structure 19, an inner rod 20, a fixing knob 21, an outer rod 22, a base 23, a universal joint 24, a rotary screw 25 and a connecting device 26

Detailed Description

For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:

in the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Example 1

As shown in FIG. 1, the embodiment of the invention provides a positioning device for a virtual skull model natural head position, which comprises an arc-shaped face bow 1, an electromagnet automatic tracing pen 2 and a bracket 3; the bottom of support 3 is fixed in the level subaerial, and arc face bow 1 is fixed on the top of a plurality of supports 3, and the height-adjustable of support 3 evenly is fixed with a plurality of electro-magnet automatic tracing pens 2 on the arc face bow 1, realizes the location to the natural head position of human body through electro-magnet automatic tracing pen 2.

As shown in fig. 2 and 3, the arc-shaped face bow 1 is composed of a semi-arc-shaped slide rail 4 and a base 5; universal spirit level 7 is placed in the base 5, and the edge of base 5 is provided with screw hole 6 for with universal spirit level 7 threaded connection.

As shown in fig. 4 and 5, a notch is formed in the upper surface of the semi-circular arc-shaped slide rail 4, an arc-shaped slide block 8 is arranged in the notch, the arc-shaped slide block 8 can freely slide in the inner groove structure of the semi-circular arc-shaped slide rail 4, a fixing screw 9 is arranged at the bottom of the arc-shaped slide block 8, and after the arc-shaped slide block 8 slides to a proper position, the fixing screw 9 can be screwed down to fix the arc-shaped slide block 8 and the semi-circular arc-shaped slide rail 4; the upper surface of the arc-shaped face bow 1 is connected with the automatic electromagnet tracing pen 2 through an arc-shaped sliding block 8; the top of the arc-shaped sliding block 8 is connected in a hollow sliding rail 10 in a sliding manner, a fixing screw 11 is arranged on the side of the hollow sliding rail 10, and after the hollow sliding rail 10 slides to a proper position, the fixing screw 11 can be screwed down to fix the arc-shaped sliding block 8 and the hollow sliding rail 10;

the arc-shaped sliding block 8 is composed of an upper part structure and a lower part structure, and the width of the upper part structure is matched with the width of the inner side of the hollow sliding rail 10; the lower structure is arc-shaped, the radian of the lower structure is matched with that of the semi-arc-shaped slide rail 4, and the width of the lower structure is matched with the inner diameter of the notch of the semi-arc-shaped slide rail 4; the upper structure of the arc-shaped sliding block 8 can enable the hollow sliding rail 10 of the automatic electro-magnet tracing pen 2 to freely slide on the arc-shaped sliding block 8, and the lower structure can freely slide in the semi-circular arc-shaped sliding rail 4.

The upper surface of the hollow slide rail 10 is connected with an electromagnet automatic tracing pen 2 through a fixing screw 12, and the electromagnet automatic tracing pen 2 consists of a pen sleeve 13, a metal pen core 14, a rubber pen point 16, a spring 17 and an electromagnet 18; the inside of the pen cap 13 is of a cavity structure, a metal pen core 14 is arranged in the cavity structure, the front end of the metal pen core 14 penetrates out of the pen cap 13, the metal pen core 14 located in the cavity structure is sequentially sleeved with an electromagnet 18 and a spring 17 from back to front, a circle of protruding structures 19 are further arranged at the front end of the spring 17 and on the metal pen core 14, the protruding structures 19 are clamped on the inner wall of the pen cap 13 to prevent the metal pen core 14 from being pushed out of the pen cap 13 by the spring 17, and the front end of the metal pen core 14 is connected with a rubber pen point 16 through a rotating button 15.

As shown in fig. 6 and 7, the bracket 3 is a telescopic structure composed of an inner rod 20 and an outer rod 22 sleeved outside the inner rod 20, the inner rod 20 and the outer rod 22 are connected and fixed through a fixing knob 21, and the bottom of the outer rod 22 is connected with a base 23; the inner rod 20 is of a bent structure and is L-shaped, the top end of the inner rod 20 is connected with a universal joint 24, the universal joint 24 is connected with a connecting device 26 through a rotating screw 25, and the other end of the connecting device 26 is connected with the arc-shaped face bow 1 through a fixing screw 27.

When the device is used, firstly, the height of the bracket 3 is adjusted according to the height of a patient, and then the fixing knob 21 is screwed down, so that the arc-shaped face bow 1 at the top end of the bracket is positioned at the position under the orbit of the patient, and the lower part of the orbit of the patient is ensured to be at the same level with the rubber pen point 16 of the electromagnet automatic tracing pen 2; after the arc-shaped sliding block 8 in the arc-shaped face bow is adjusted to reach a proper position, the arc-shaped sliding block 8 is fixed on the semi-arc-shaped sliding rail 4 by using a fixing screw 9; according to the indication of the universal level gauge 7 on the arc-shaped face bow 1, the height of the bracket 3 and the angle of the universal joint 24 are adjusted to ensure that the whole arc-shaped face bow 1 is in a horizontal position; then, according to the sizes of the skull of different patients, the pen cap 13 slides back and forth on the arc-shaped sliding block 8, so that the rubber pen point 16 is adjusted to be in right contact with the face of the patient, X-ray developing paste is smeared on the rubber pen point 16 of the electromagnetic automatic tracing pen 2 for standby, a power supply is switched on to electrify the electromagnet 18, the metal pen core 14 is adsorbed by magnetic force to compress the spring 17, at the moment, the electromagnetic automatic tracing pen 2 is in a contraction state, and the rubber pen point 16 is enabled to be one centimeter away from the face of the patient. Then the patient is adjusted to the natural head position, the face of the patient enters the arc face bow 1, the power supply of the electromagnet 18 is cut off, the spring 17 is released, the metal pen core 14 is simultaneously ejected by the spring, and the electromagnet automatic tracing pen 2 extends and traces a marking point which can be developed under an X-ray on the lower part of the orbit of the patient; the arrangement of the convex structure 19 of the metal pen core 14 ensures that the metal pen core 14 cannot be excessively stretched to cause damage to a patient; at this point, the patient's face has traced a number of marker points and the natural head recording is complete.

The main structure of the device for accurately determining the natural head position of the virtual skull model is made of medical stainless steel, so that the device is high in strength and not easy to deform. The arc-shaped face bow 1 can be ensured to be parallel to the ground under the indication of the universal level gauge 7, and the recording of the natural head position is guaranteed. The rubber pen point 16 of the electromagnet automatic tracing pen 2 is coated with X-ray developing paste in advance every time of use, and can be repeatedly used after being cleaned and disinfected.

Example 2

The invention relates to a positioning device for a natural head position of a virtual skull model, which has the following size parameters:

the inner diameter of the semi-arc slide rail 4 is 120mm, the outer diameter is 160mm, the height is 10mm, and the width of the middle rail is 10 mm; the width and the length of the base 5 are respectively 20mm and 30mm, and the height is 10 mm; the diameter of the universal level gauge 7 is 15mm, and the thickness is 5 mm; the arc-shaped sliding block 8 is correspondingly 15 degrees and about 31mm in length.

The pen cap 13 of the automatic electromagnet tracing pen 2 is of a cuboid structure, the length is 55mm, the width is 20mm, and the height is 25 mm; the metal pen core 14 is of a cylindrical structure, the total length is 65mm, and the diameter is 8 mm. The height of the hollow slide rail 11 below the pen cap 13 is 10mm, and the length is 60 mm.

In the main structure of the bracket 3, the height of the inner rod 20 is 1000mm, the diameter of the inner rod is 20mm, the height of the outer rod 22 is 1000mm, and the diameter of the outer rod is 25 mm; the bottom of the bracket 3 is a disc-shaped base 23 with the diameter of 100mm and the height of 10 mm.

Example 3

A virtual skull model natural head position positioning method specifically comprises the following steps:

firstly, adjusting the height of a support according to the height of a patient, and then screwing a fixing knob so as to enable an arc-shaped face bow positioned at the top end of the support to be positioned at the position under the orbit of the patient, and ensuring that the lower part of the orbit of the patient and a pen point of an automatic tracing pen of an electromagnet are in the same level; after the arc-shaped sliding block in the arc-shaped face bow is adjusted to reach a proper position, the arc-shaped sliding block is fixed on the semi-arc-shaped sliding rail by using a fixing screw; according to the indication of the universal level gauge on the arc-shaped face bow, the height of the bracket and the angle of the universal joint are adjusted, so that the whole arc-shaped face bow is in a horizontal position;

secondly, enabling the pen cap to slide back and forth on the arc-shaped sliding block according to the sizes of the skull of different patients, so as to adjust the rubber pen point to be in right contact with the face of the patient, smearing X-ray developing paste on the rubber pen point of the automatic electromagnet tracing pen for standby application, turning on a power supply to electrify the electromagnet, enabling the metal pen core to be adsorbed by magnetic force to compress the spring, and enabling the automatic electromagnet tracing pen to be in a contraction state at the moment to enable the rubber pen point to be one centimeter away from the face of the patient;

step three, adjusting the patient to a natural head position, enabling the face of the patient to enter the arc face bow, disconnecting the power supply of the electromagnet, releasing the spring, simultaneously ejecting the metal pen core by the spring, and automatically extending the electromagnet tracing pen and tracing a marking point which can be developed under an X line on the lower part of the orbit of the patient; the protruding part of the metal pen core is arranged, so that the metal pen core is prevented from being excessively stretched to cause damage to a patient;

and fourthly, tracing a plurality of mark points on the face of the patient, and finishing the recording of the natural head.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.