CN112315569B

CN112315569B - Internal fixation structure and internal fixation system of spine

Info

Publication number: CN112315569B
Application number: CN202011261852.8A
Authority: CN
Inventors: 王晋; 肖建如; 刘明岩; 顾然; 李中华; 马宇立
Original assignee: Shanghai Sanyou Medical Co ltd
Current assignee: Shanghai Sanyou Medical Co ltd; Second Military Medical University SMMU
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2024-09-27
Anticipated expiration: 2040-11-12
Also published as: CN112315569A; CN115568924B; CN115568924A

Abstract

The invention provides an internal fixation structure of a spine and an internal fixation system thereof, comprising: a plug member, a screw member and a rod body; the plug piece comprises a plug seat and a plug column connected with the lower end of the plug seat; the plug seat is provided with a plug part mounting hole; the bottom surface of the plug column is provided with a separation groove, the separation groove extends along the length direction of the plug column, the separation groove separates the plug column into two block structures, and the separation groove is communicated with the plug part mounting hole; the central axis of the plug part mounting hole is obliquely arranged relative to the central axis of the plug column; the plug part mounting hole is used for inserting the rod body; the screw member comprises a screw seat and a screw body arranged at the lower end of the screw seat, and the screw seat is provided with a seat body mounting hole; the plug column is clamped in the seat body mounting hole. The invention provides an internal fixation structure of a spine and an internal fixation system thereof, which have the advantages of simple structure, convenient operation and reliable locking. The internal fixation structure of the spine can avoid interference to detection means such as X-rays, CT, MRI and the like, and meets the intensity required by implantation.

Description

Internal fixation structure of spine and internal fixation system thereof

Technical Field

The invention relates to the technical field of medical equipment, in particular to an internal fixation structure of a spine and an internal fixation system thereof.

Background

For patients with spinal tumor, after nerve decompression and spinal tumor excision, an internal fixation structure is often required to fix the spinal column in an auxiliary way, so that the normal physiological function of the spinal column is recovered. How to design an internal fixation structure of the spine, which has simple structure, convenient operation and reliable locking, is a problem to be solved by the technicians in the field.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention solves the technical problem of providing an internal fixation structure of the spine and an internal fixation system thereof.

To achieve the above and other related objects, the present invention provides an internal fixation structure of a spinal column, comprising: a plug member, a screw member and a rod body;

The plug piece comprises a plug seat and a plug column connected with the lower end of the plug seat; the plug seat is provided with a plug part mounting hole; a separation groove is formed in the bottom surface of the plug column, the separation groove extends along the length direction of the plug column, the separation groove separates the plug column into two block structures, and the separation groove is communicated with the plug part mounting hole; the central axis of the plug part mounting hole is obliquely arranged relative to the central axis of the plug column; the plug part mounting hole is used for inserting the rod body;

The screw member comprises a screw seat and a screw body arranged at the lower end of the screw seat, and a seat body mounting hole is formed in the screw seat; the seat body mounting hole is used for clamping in the plug column.

Preferably, the screw member is made of a polymer matrix composite material or a polymer material; the material of the rod body is a polymer matrix composite material or a polymer material; the plug member is made of a polymer material. In the detection stage of the process of preparing the spinal tumor treatment scheme by combining the operation and the radiotherapy, if the spinal internal fixation system made of metal materials in the prior art is implanted in the operation, X-rays and CT artifact effects are generated, the magnetic principle of the MRI detection mode can lead to metal displacement, and the possibility of adopting MRI detection after the operation is completely eliminated by the implantation of the internal fixation system made of metal materials. The material adopted by the internal fixation structure of the spine ensures that the internal fixation structure of the spine can avoid interference to detection means such as X-ray, CT, MRI and the like and meet the intensity required by implantation. Preferably, the plug column is in a conical structure, and the seat body mounting hole is in a conical structure corresponding to the plug column.

Preferably, the connection part between the plug part mounting hole and the separation groove is an opening part of the plug seat, and the opening part is provided with two oppositely arranged protruding structures, and each protruding structure extends towards the inside of the plug part mounting hole.

Further, the plug part mounting hole is a round hole, and the diameter of the plug part mounting hole is larger than the diameter of the cross section of the rod body; the maximum distance between the protruding structure and the hole wall of the plug part mounting hole is smaller than the diameter of the cross section of the rod body.

Preferably, an included angle between the central axis of the seat body mounting hole of the nail seat and the central axis of the nail body is greater than or equal to 0 degree.

Further, when the included angle between the central axis of the seat body mounting hole of the nail seat and the central axis of the nail body is larger than 0 degree, the seat body mounting hole is a through hole or a blind hole.

Preferably, the outer side surface of the plug column is provided with a plurality of wedge-shaped bulges, and all the wedge-shaped bulges are sequentially arranged along the axial direction of the plug column.

Preferably, the rod body is a straight rod or a bent rod.

The invention also relates to an internal fixation system of the spine, which adopts the internal fixation structure of the spine; the internal fixation system of the spine comprises: a rod body, at least two plug members and at least two screw members; the number of the plug members is equal to that of the screw members, the rod body penetrates into all the plug portion mounting holes of the plug members, and the plug post of each plug member is clamped into the corresponding seat body mounting hole of the screw member.

As described above, the internal fixation structure of the spinal column and the internal fixation system thereof of the present invention have the following advantageous effects:

When the internal fixing structure of the spine is used, after the rod body is inserted into the plug part mounting hole of the plug seat, the plug column provided with the separation groove is inserted into the seat body mounting hole of the nail seat, the plug column separated into two block structures by the separation groove is gradually closed in the process that the plug column gradually stretches into the seat body mounting hole, the friction force between the plug column and the seat body mounting hole of the nail seat is gradually increased, the groove width of the separation groove is gradually reduced, the friction force between the rod body and the plug part mounting hole of the plug seat is increased, and when the friction force between the plug column and the seat body mounting hole of the nail seat is finally increased to a state of locking the plug column and the nail seat, the plug part mounting hole of the plug seat also simultaneously clamps the rod body, so that synchronous locking is realized between the screw piece and the plug piece and between the rod body and the plug piece; the invention provides an internal fixation structure of a spine and an internal fixation system thereof, which have the advantages of simple structure, convenient operation and reliable locking.

Drawings

Fig. 1 is a schematic perspective view of the internal fixation structure of the spine according to the present embodiment, when the included angle between the central axis of the seat body mounting hole of the nail seat and the central axis of the nail body is equal to 0 degrees.

Fig. 2 is a schematic perspective view showing an angle between the central axis of the seat body mounting hole of the nail seat and the central axis of the nail body, which is used in the internal fixation structure of the spine of the present embodiment, being greater than 0 degrees.

Fig. 3 is a schematic side view of the structure of the present embodiment, in which the included angle between the central axis of the seat body mounting hole of the nail seat and the central axis of the nail body is greater than 0 degrees.

Fig. 4 is a schematic view showing a structure in which a rod body of the internal fixation structure of the spinal column according to the present embodiment is a bent rod.

Fig. 5 is a schematic view showing the structure of the rod body of the internal fixation structure of the spine according to the present embodiment as a straight rod.

Fig. 6 is a schematic view showing a structure in which no wedge-shaped protrusions are provided on the plug post of the plug member of the internal fixation structure of the spinal column of the present embodiment.

FIG. 7 is a schematic view showing the structure of the plug member of the internal fixation structure of the spinal column according to the present embodiment in which wedge-shaped protrusions are provided on the plug member

Fig. 8 is a schematic structural view showing the structure of the internal fixation structure of the spine of the present embodiment when the included angle between the central axis of the seat body mounting hole of the screw seat and the central axis of the screw body is equal to 0 degrees.

Fig. 9 shows a schematic structural view of the screw member of the internal fixation structure of the spine of this embodiment, in which the included angle between the central axis of the seat body mounting hole and the central axis of the screw body is greater than 0 degrees, and the seat body mounting hole is a blind hole.

Fig. 10 shows a schematic structural view of the screw member of the internal fixation structure of the spine of this embodiment, in which the included angle between the central axis of the seat mounting hole of the screw seat and the central axis of the screw body is greater than 0 degrees, and the seat mounting hole is a through hole.

Fig. 11 is a schematic structural view showing the internal fixation system of the spine of the present embodiment.

Fig. 12 shows a schematic cross-sectional structure of the screw seat of the screw member of the internal fixation structure of the spine of this embodiment, in which the seat body mounting hole is a blind hole, and the central axis of the seat body mounting hole and the central axis of the screw body have an included angle equal to 0 degrees.

Fig. 13 shows a schematic cross-sectional structure of the screw seat of the screw member of the internal fixation structure of the spine of this embodiment, in which the seat body mounting hole is a blind hole, and the central axis of the seat body mounting hole and the central axis of the screw body have an included angle equal to 30 degrees.

Fig. 14 shows a schematic cross-sectional structure of the screw seat of the internal fixation structure of the spine according to this embodiment, in which the seat body mounting hole of the screw seat is a through hole, and the central axis of the seat body mounting hole and the central axis of the screw body have an included angle equal to 60 degrees.

Description of the reference numerals

100. Plug-in element

110. Plug seat

111. Plug part mounting hole

112. An opening part

113. Chamfering tool

120. Plug column

121. Partition groove

122. Block structure

123. Wedge-shaped protrusion

130. Protruding structure

200. Screw member

210. Nail seat

211. Mounting hole of seat body

220. Nail body

300. Rod body

Center point A of A rod body

Central axis of nail body of L1 screw

W1 distance between the center point of the rod body and the central axis of the shank of the screw member in the vertical section

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings and described herein are for illustration purposes only and should not be construed as limiting the scope of the invention, therefore, without any technical significance, any structural modification, proportional relation change or size adjustment should still fall within the scope of the technical content disclosed by the invention without affecting the efficacy and achievement of the purpose of the invention. Also, the terms "upper," "lower," "left," "right," "middle," "distal," "proximal," and "a" are used herein for descriptive purposes only and not for purposes of limitation, and are intended to limit the scope of the invention as defined by the claims and the relative terms thereof as may be modified or altered without materially altering the general principles of the invention.

As shown in fig. 1 to 11, the internal fixation structure of the spine of the present embodiment includes: plug 100, screw member 200 and rod 300;

Plug 100 includes a plug seat 110 and a plug post 120 connected to a lower end of plug seat 110; the plug seat 110 is provided with a plug part mounting hole 111; the bottom surface of the plug 120 is provided with a separation groove 121, the separation groove 121 extends along the length direction of the plug 120, the separation groove 121 separates the plug 120 into two block structures 122, and the separation groove 121 is communicated with the plug part mounting hole 111; the central axis of the plug portion mounting hole 111 is inclined with respect to the central axis of the plug post 120; plug portion mounting hole 111 for insertion of rod 300;

The screw member 200 includes a nail seat 210 and a nail body 220 mounted at the lower end of the nail seat 210, and a seat body mounting hole 211 is formed in the nail seat 210; the socket mounting hole 211 is used for the plug column 120 to be clamped in.

When the internal fixing structure of the spine of the present invention is used, after the rod 300 is inserted into the plug portion mounting hole 111 of the plug seat 110, the plug 120 provided with the separation groove 121 is inserted into the seat body mounting hole 211 of the nail seat 210, in the process that the plug 120 gradually extends into the seat body mounting hole 211, the plug 120 separated into two block structures 122 by the separation groove 121 is gradually closed, the friction force between the plug 120 and the seat body mounting hole 211 of the nail seat 210 is gradually increased, the groove width of the separation groove 121 is gradually reduced, the friction force between the rod 300 and the plug portion mounting hole 111 of the plug seat 110 is also increased, and when the friction force between the plug 120 and the seat body mounting hole 211 of the nail seat 210 is finally increased to a state of locking the plug 120 and the nail seat 210, the plug portion mounting hole 111 of the plug seat 110 also simultaneously clamps the rod 300, and synchronous locking is realized between the screw member 200 and the plug member 100 and between the rod 300 and the plug member 100; the invention provides an internal fixation structure of a spine, which has the advantages of simple structure, convenient operation and reliable locking.

In this embodiment, the nail body 220 and the nail seat 210 adopt an arc transition. The central axis of the plug portion mounting hole 111 is perpendicular to the central axis of the plug post 120. The central axis of the plug 120 passes through the separation groove 121.

The screw member is made of a polymer matrix composite material or a polymer material; the material of the rod body is a polymer matrix composite material or a polymer material; the plug member is made of a polymer material.

When the screw member 200 and the rod body 300 are made of the polymer-based composite material, the polymer-based composite material has a large elastic modulus, and the equivalent strength with the metal material is realized on the premise of not increasing the structural size. The plug 100 is made of a polymer material, and the polymer material has high plasticity, so that brittleness of a complex structure of the plug can be reduced, structural damage caused by special operation in operation is avoided, and structural stability is improved. Therefore, the whole internal fixation structure does not generate abnormal display in X-ray, CT and MRI examination. The polymer material is medical polyether-ether-ketone, and the polymer-based composite material is carbon fiber reinforced medical polyether-ether-ketone. When the screw member 200 is applied to working conditions with low working load, one of the screw member 200 and the rod body 300 is made of a high polymer material or both the screw member and the rod body are made of a high polymer material according to requirements.

For the patient with spinal tumor, after nerve decompression and spinal tumor excision, the internal fixation structure of the spinal column of the embodiment is often required to be adopted for auxiliary fixation of the spinal column, so that the normal physiological function of the spinal column is recovered. In recent years, surgical methods combining surgery and radiotherapy have been increasingly used in the treatment of spinal tumors. Based on clinical evidence, the manner in which surgery is combined with radiation therapy has long been accepted. In early treatment of tumors in the spine, if the tumor cannot be completely resected for the purpose of avoiding damage to nerve function, etc., a combination of surgery and radiation therapy is often required. Complete excision procedures, such as malignant tumors, recurrent tumors, or large tumors that dilate in the foramen, can cause significant damage to the patient's neurological function. In the above-mentioned operation, a doctor usually avoids cutting off the tumor near the nerve of the patient, and leaves the rest of the tumor in the subsequent radiotherapy process, and after the accurate positioning is detected, the tumor is cleared by using radioactive rays.

In the residual tumor detection stage of the operation which helps to make the backbone tumor treatment scheme combining the operation and the radiotherapy, if the existing metal internal fixation system is implanted in the prior operation, the detection is interfered. For example X-ray, CT artifact effects, the magnetic principle of MRI detection mode may lead to metal displacement. The accurate detection means without shielding is the key for improving the effect of subsequent radiotherapy. The intraspinal fixation system made of metal materials can also produce absorption and scattering effects on radioactive rays for treating tumors, and influence the preparation of radiotherapy schemes and the accurate calculation of radiometric.

The material adopted by the internal fixation structure of the spine of the embodiment ensures that the internal fixation structure of the spine can avoid the interference to detection means such as X-ray, CT, MRI and the like and meet the intensity required by implantation.

The plug 120 has a conical structure, and the housing mounting hole 211 has a conical structure corresponding to the plug 120. The inclination angle formed by the hole wall of the seat body mounting hole 211 and the central axis of the seat body mounting hole 211 is equal to the inclination angle formed by the outer side surface of the plug post 120 and the central axis of the plug post 120. Since the housing mounting hole 211 and the plug post 120 are both conical structures, the housing mounting hole 211 performs centering and guiding functions on the inserted plug post 120. The diameter of the lower end of the plug 120 is smaller than the diameter of the insertion opening of the housing mounting hole 211, and the plug 120 can be easily inserted into the interior of the housing mounting hole 211.

The body 300 is a straight rod or a bent rod. In order to adapt to different implantation positions, the physiological curvature of the spine of people in different age stages. In addition to straight bars, the body 300 of the present embodiment includes curved bars of different curvature. In this embodiment, the cross sections of the straight rod and the curved rod are circular structures with the same size, so that different rod bodies 300 can be inserted into the plug portion mounting holes 111 of the plug member 100 with the same specification, and the surgeon only needs to select the proper rod body 300 according to the physiological structure of the patient.

The communication between the plug mounting hole 111 and the partition groove 121 is an opening 112 of the plug seat 110, and the opening 112 is provided with two oppositely arranged protruding structures 130, and each protruding structure 130 extends towards the inside of the plug mounting hole 111. When the rod 300 is inserted into the plug portion installation hole 111, the rod 300 presses the protrusion structure 130 so that the two block structures 122 of the plug 120 are opened to both sides of the separation groove 121, so that the rod 300 can be inserted into the plug portion installation hole 111. This configuration can facilitate the operator's freehand penetration of the curved rod of high curvature into the plug portion mounting hole 111.

The plug part mounting hole 111 is a round hole, and the diameter of the plug part mounting hole 111 is larger than the diameter of the cross section of the rod body 300; the maximum distance between the protrusion 130 and the wall of the plug portion mounting hole 111 is smaller than the diameter of the cross section of the rod 300. The diameter of the plug portion mounting hole 111 is larger than the diameter of the cross section of the rod body 300, so that the rod body 300 can conveniently penetrate into the plug portion mounting hole 111; the rod 300 positioned in the plug portion mounting hole 111 is pressed by the protrusion structure 130, the rod 300 is supported by the protrusion structure 130, and the rod 300 can be in contact with a region on the wall of the plug portion mounting hole 111 opposite to the protrusion structure 130. The protrusion 130 allows the straight bar and the bent bar to be positioned at a specific position of the plug portion mounting hole 111 after locking, so that the straight bar and the bent bar have the same locking force.

The included angle between the central axis of the seat body mounting hole 211 of the nail seat 210 and the central axis of the nail body 220 is greater than or equal to 0 degree. The screw member 200 has various specifications, the included angles between the central axes of the seat body mounting holes 211 and the central axes of the screw bodies 220 of the screw members 200 with different specifications are different, the screw seat 210 is cylindrical, and the depth of the seat body mounting holes 211 can be increased by adjusting the included angle between the central axes of the seat body mounting holes 211 and the central axes of the screw bodies 220 under the condition that the diameter of the screw seat 210 and the height of the screw seat 210 are determined. The included angles between the central axes of the seat body mounting holes 211 and the central axes of the nail bodies 220 of the screw members 200 with different specifications are different, so that a doctor can select an appropriate screw member 200 according to the height between the central point of the rod body 300 and the bone surface on the vertical section and the distance L2 between the central point A of the rod body 300 and the central axis L1 of the nail body 220 of the screw member 200 on the vertical section, which are required to be achieved in the operation, so that the forced correction or the adjustment of the nail insertion path to the spine of a patient can be avoided due to the influence of the rod insertion path.

When the included angle between the central axis of the seat body mounting hole 211 of the nail seat 210 and the central axis of the nail body 220 is greater than 0 degree, the seat body mounting hole 211 is a through hole or a blind hole so as to be adapted to the mounting requirements of different patients.

As shown in fig. 12, the seat body mounting hole 211 is a blind hole, and an included angle between a central axis of the seat body mounting hole 211 and a central axis of the nail body 220 is equal to 0 degree. As shown in fig. 13, the seat body mounting hole 211 is a blind hole, and an included angle between a central axis of the seat body mounting hole 211 and a central axis of the nail body 220 is equal to 30 degrees. As shown in fig. 14, the seat body mounting hole 211 is a through hole, and an included angle between a central axis of the seat body mounting hole 211 and a central axis of the nail body 220 is equal to 60 degrees.

As shown in fig. 1 to 14, the outer side surface of the plug 120 has a plurality of wedge-shaped protrusions 123 thereon, and all the wedge-shaped protrusions 123 are disposed in order along the axial direction of the plug 120. Each wedge-shaped protrusion 123 extends circumferentially around the outer side of the plug 120. All of the wedge-shaped protrusions 123 are located at the lower portion of the plug 120. When the seat body mounting hole 211 is a through hole, after the plug column 120 is inserted into the seat body mounting hole 211, the wedge-shaped protrusions 123 are clamped at the bottom edge of the seat body mounting hole 211, so that the anti-extraction force between the plug 100 and the nail seat 210 is increased, the closing of the separation groove 121 can be further increased by the wedge-shaped protrusions 123 in the seat body mounting hole 211, and all the wedge-shaped protrusions 123 are sequentially provided with a structure forming a plurality of layers of wedge-shaped protrusions 123 along the axial direction of the plug column 120 so as to adapt to the requirement that the plug column 120 is inserted into the seat body mounting hole 211 at different depths.

When the plug 120 is inserted into the desired depth of the socket 210, the plug 120 is clamped in the socket mounting hole 211, and the plug 120 and the socket mounting hole 211 are locked, at this time, on the same cross section, the diameter of the socket mounting hole 211 is smaller than the diameter of the corresponding plug 120, and on the same cross section, the diameter of the socket mounting hole 211 and the diameter of the plug 120 are different, so that the plug 120 is forced to be extruded under the limitation of the socket mounting hole 211, and a pressure is generated between the plug 120 and the socket mounting hole 211, and the plug 120 and the socket mounting hole 211 are firmly combined together under the static friction generated by the pressure.

For the nail seat 210 with the seat body mounting hole 211 being a through hole, after the plug column 120 extends out of the bottom of the seat body mounting hole 211, due to the existence of the separation groove 121, the wedge-shaped protrusion 123 of the extending part of the plug column 120 will spring away from the separation groove 121 and be clamped into the bottom edge of the seat body mounting hole 211, so that the load required for pulling out the plug column 120 from the nail seat 210 is further increased. The screw member 200 is made of a polymer-based composite material, the surface structure of the screw seat 210 of the screw member 200 is complete and continuous, and the phenomena of stress concentration caused by a thread structure, fiber extraction and surface tearing of the composite material of the screw seat 210 are effectively avoided. As the depth of insertion of the plug 120 into the socket 210 increases, the diameter difference between the diameter of the socket mounting hole 211 and the diameter of the plug 120 increases in the same cross section, and the friction between the plug 120 and the socket 210 increases accordingly, which avoids the problem that the locking force between the socket 210 and the plug 120 is insufficient due to the machining tolerance of the socket 210 and the plug 120, and the surgeon can increase the locking friction by increasing the insertion depth of the plug 120 to finally satisfy the requirement of stable locking. For patients requiring additional fixation loads, the physician may choose to use a screw member 200 with a through hole in the housing mounting hole 211, and the wedge-shaped protrusion 123 at the bottom of the plug post 120 may further increase the stability of the structure. The included angles between the central axes of the seat body mounting holes 211 and the central axes of the screw bodies 220 of the screw members 200 of different specifications are different, and a doctor can adjust the height between the central point a of the rod body 300 and the bone surface in the vertical section and the distance W1 (shown in fig. 3) between the central point a of the rod body 300 and the central axis L1 of the screw body 220 of the screw member 200 in the vertical section by selecting the screw members 200 of different included angles. After the plug stem 120 is fixed to the socket 210, the angle between the plug stem 120 and the pin 220 is fixed at the same time, avoiding the possibility of torsional displacement between the plug 100 and the socket 210 as the patient moves. The pin 220 is designed with large bottom diameter and thick thread to ensure the strength of the pin 220 and the thread root.

The plug portion mounting hole 111 is a through hole, and both ends of the plug portion mounting hole 111 are provided with chamfers 113, and the arrangement of the chamfers 113 plays a guiding role when the rod 300 penetrates into the plug portion mounting hole 111.

The internal fixation system of the spine adopts an internal fixation structure of the spine; the internal fixation system of the spine comprises: one shank 300, at least two plugs 100 and at least two screw members 200; the number of the plug members 100 is equal to the number of the screw members 200, and the rod body 300 penetrates into the plug portion mounting holes 111 of all the plug members 100, and the plug post 120 of each plug member 100 is caught in the seat body mounting hole 211 of the corresponding screw member 200. As shown in fig. 11, in the internal fixation system of the spine of the present embodiment, the number of the screw members 200 is two, and the angles of the central axes of the seat mounting holes 211 of the two screw members 200 and the central axis of the screw body 220 are different.

The method for installing the internal fixation system of the spine of the present embodiment includes the steps of: firstly, a doctor plans a rod setting path according to a physiological structure of a patient, estimates the distance between the central point of the rod 300 and the central axis of the nail 220 of the screw 200 on a preset vertical section, selects the screw 200 with an included angle of a proper nail seat 210 for implantation, selects the rod 300 with a proper radian, determines the number of the plug members 100 according to the number of spinal column segments involved in operation, then penetrates the rod 300 into the plug portion mounting holes 111 of the plug members 100, inserts the assembly of the plug members 100 and the rod 300 into the seat mounting holes 211 of the nail seat 210, and the insertion depth can be adjusted by the doctor according to the estimated locking force required by the actual condition of the patient, and realizes the locking of the plug members 100 and the rod 300 while locking the plug members 100 and the screw members 200.

Aiming at the use condition of high load, the internal fixing structure is made of two nonmetallic materials which do not influence the radiotherapy effect, the thick-tooth large-bottom-diameter screw member 200 realizes conical friction locking, the conical plug 120 with the separation groove 121 is arranged, the middle part of the cylindrical hole of the plug 100 is provided with the protruding structure 130, and the design scheme that the height between the central point of the rod body 300 and the bone surface on the vertical section and the distance W1 between the central point A of the rod body 300 and the central axis L1 of the nail body 220 of the screw member 200 on the vertical section can be adjusted can be realized. The internal fixation system has a simple structure, can adapt to the needs of patients with different physiological radians, is simple and convenient to operate, and is convenient for operation in operation. Aiming at the characteristics of low strength, low modulus, high plasticity and brittleness of the high polymer matrix composite material, the internal fixing structure optimizes the structural design, and the internal fixing structure respectively applies two materials to parts in different stress states. The internal fixing structure reduces the structural size and improves the stability. Compared with the existing metal internal fixing structure, the internal fixing structure has the same auxiliary supporting effect on the spine, can be suitable for various mature surgical operations, solves the problem that a nonmetal internal fixing system cannot bear the spine load of a human body, and avoids the problems of detection obstacle and radiation shielding caused by the metal internal fixing system. Can be suitable for a wider patient population, and brings better treatment effect for patients. Aiming at the use condition of low load, the internal fixing structure of the invention correspondingly adjusts the used materials so as to simplify the processing and the use.

Aiming at the difficulties of the patients with spinal tumor in the combined treatment of the operation and the radiotherapy, the invention provides the internal fixation structure and the internal fixation system of the spinal, which are made of nonmetallic materials and have the advantages of simple structure, convenient operation and reliable locking. The invention has no interference to X-ray, CT and MRI examination and no influence on radiotherapy effect.

In conclusion, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. An internal fixation structure for a spinal column, comprising: a plug member (100), a screw member (200) and a rod body (300);

The plug (100) comprises a plug seat (110) and a plug post (120) connected with the lower end of the plug seat (110); the plug seat (110) is provided with a plug part mounting hole (111); a separation groove (121) is formed in the bottom surface of the plug column (120), the separation groove (121) extends along the length direction of the plug column (120), the separation groove (121) separates the plug column (120) into two block structures (122), and the separation groove (121) is communicated with the plug part mounting hole (111); the central axis of the plug part mounting hole (111) is obliquely arranged relative to the central axis of the plug column (120); the plug part mounting hole (111) is used for inserting the rod body (300);

The screw member (200) comprises a screw seat (210) and a screw body (220) arranged at the lower end of the screw seat (210), and a seat body mounting hole (211) is formed in the screw seat (210); the seat body mounting hole (211) is used for clamping the plug column (120); the plug column (120) and the nail seat (210) are locked by utilizing friction force between the plug column (120) and the seat body mounting hole (211) of the nail seat (210).

2. An internal fixation structure of the spine according to claim 1, wherein: the screw member (200) is made of a polymer-based composite material or a polymer material; the material of the rod body (300) is a polymer matrix composite material or a polymer material; the plug member (100) is made of a polymer material.

3. An internal fixation structure of the spine according to claim 1, wherein: the plug column (120) is of a conical structure, and the seat body mounting hole (211) is of a conical structure corresponding to the plug column (120).

4. An internal fixation structure of the spine according to claim 1, wherein: the communication part of the plug part mounting hole (111) and the separation groove (121) is an opening part (112) of the plug seat (110), the opening part (112) is provided with two oppositely arranged protruding structures (130), and each protruding structure (130) extends towards the inside of the plug part mounting hole (111).

5. An internal fixation structure of the spine as defined in claim 4, wherein: the plug part mounting hole (111) is a round hole, and the diameter of the plug part mounting hole (111) is larger than the diameter of the cross section of the rod body (300); the maximum distance between the protrusion structure (130) and the hole wall of the plug part mounting hole (111) is smaller than the diameter of the cross section of the rod body (300).

6. An internal fixation structure of the spine according to claim 1, wherein: the included angle between the central axis of the seat body mounting hole (211) of the nail seat (210) and the central axis of the nail body (220) is more than or equal to 0 degree.

7. An internal fixation structure of the spine as defined in claim 6, wherein: when the included angle between the central axis of the seat body mounting hole (211) of the nail seat (210) and the central axis of the nail body (220) is larger than 0 degree, the seat body mounting hole (211) is a through hole or a blind hole.

8. An internal fixation structure of the spine according to claim 1, wherein: the outer side surface of the plug column (120) is provided with a plurality of wedge-shaped bulges (123), and all the wedge-shaped bulges (123) are sequentially arranged along the axial direction of the plug column (120).

9. An internal fixation structure of the spine according to claim 1, wherein: the rod body (300) is a straight rod or a bent rod.

10. An internal fixation system for the spine employing the internal fixation structure of the spine as claimed in any one of claims 1 to 9; the method is characterized in that: the internal fixation system of the spine comprises: a rod body (300), at least two plug members (100) and at least two screw members (200); the number of the plug members (100) is equal to the number of the screw members (200), the rod bodies (300) penetrate into all plug portion mounting holes (111) of the plug members (100), and the plug posts (120) of each plug member (100) are clamped into the seat body mounting holes (211) of the corresponding screw member (200).