CN214208466U - Femoral neck fixing component - Google Patents
Femoral neck fixing component Download PDFInfo
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- CN214208466U CN214208466U CN202022878221.2U CN202022878221U CN214208466U CN 214208466 U CN214208466 U CN 214208466U CN 202022878221 U CN202022878221 U CN 202022878221U CN 214208466 U CN214208466 U CN 214208466U
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- screw
- femoral neck
- hole
- lag
- pressurizing
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Abstract
The utility model relates to the technical field of medical equipment, specifically disclose a fixed subassembly of femoral neck, it includes femoral neck coaptation board, lag screw, forcing screw and tail cap, lag screw and forcing screw pass femoral neck coaptation board and both cooperations and use, the downthehole screw in tail cap of the pressurization of femoral neck coaptation board to deviate from in preventing forcing screw and lag screw femoral neck fishplate. The utility model discloses a subassembly is fixed to cervical bone neck has bending resistance, anti ability of revolving and anti nail ability of moving back, reduces the risk that femoral neck resets failure at recovered in-process.
Description
Technical Field
The utility model relates to the field of medical equipment, concretely relates to subassembly is fixed to thighbone neck.
Background
Neck of femur fracture is one of the most common fractures, and the junction between the femoral head and the femur is called the neck of the femur, which carries most of the weight of the upper body of the human body. Therefore, the bending resistance, the rotation resistance and the nail withdrawal resistance of the internal fixator for the femoral neck fracture treatment are important factors influencing the good and bad treatment effect of the femoral neck. For example, the chinese utility model patent with the prior art publication number CN211094606U discloses a bone fixation nail and a bone fixation assembly, the axis of the bone fixation nail of this structure and the axis of the anti-rotation nail are arranged in different planes and the locking nut for preventing the anti-rotation nail from being separated out is provided. Although the structure has certain anti-rotation capacity and anti-screw-back capacity, after the bone fixing screw and the anti-rotation screw are implanted into a human body, the two screws cannot bear the weight in the same direction in a resultant force manner due to the fact that the bone fixing screw and the anti-rotation screw are arranged in different surfaces, and therefore the anti-bending capacity of the bone fixing screw and the anti-rotation screw is relatively weak. Also disclosed in chinese patent publication No. CN108042189A is a femoral neck fracture implant having a co-planar cross arrangement of an implant shaft and an anti-rotation screw. The structure also has certain anti-rotation capability and anti-nail-withdrawal capability, but after the structure is implanted into a human body, the implant shaft and the anti-rotation screw of the structure can not bear the weight in a resultant force in different directions, and the defect of poor bending resistance is also existed. The bending resistance is weakened, and two nails are easy to cut out or break in the rehabilitation process, so that the femoral neck is failed to reset, and the risk of secondary operation of a patient is increased.
Disclosure of Invention
The utility model aims at providing a subassembly is fixed to femoral neck that has better bending resistance to the above-mentioned problem that exists among the prior art to reduce the risk that femoral neck resets and fails.
Realize the utility model discloses the technical scheme of purpose is: the femoral neck fixing component comprises a compression screw, a lag screw, a tail cap and a femoral neck bone fracture plate, wherein the lag screw and the compression screw are sized and dimensioned to be inserted into a femoral head, the compression screw consists of a screw rod positioned at the front end and a cylinder positioned at the rear end, the diameter of the cylinder is slightly larger than that of the screw rod, and a first groove is formed in the end surface of the cylinder; the front end of the lag screw is provided with external threads, the peripheral surface of the lag screw is provided with an arc groove, the tail end of the lag screw is provided with a straight-line groove, thread teeth matched with a screw rod of the compression screw are arranged in the arc groove, the axis of the arc groove is parallel to the axis of the lag screw, and the axes of the arc groove and the lag screw are in the same vertical plane; the femur neck bone fracture plate is composed of an insertion part and an attaching plate, the insertion part and the attaching plate are fixedly connected at an angle of 125-135 degrees, a tension hole which penetrates through the insertion part and the attaching plate simultaneously and is used for mounting a tension screw and a pressurizing hole which is used for mounting a pressurizing screw are arranged on the femur neck bone fracture plate, the tension hole is communicated with the pressurizing hole, a hole shoulder which is connected with a cylinder of the pressurizing screw is arranged in the pressurizing hole, and an internal thread is arranged on the hole wall of the pressurizing hole which is connected with the cylinder of the pressurizing screw; the outer peripheral surface of the tail cap is provided with an external thread matched with the internal thread of the pressurizing hole, and the tail cap is screwed into the pressurizing hole to prevent the lag screw from falling out of the lag hole of the femoral neck bone fracture plate.
The utility model discloses a fixed subassembly of thighbone neck's theory of operation: when the compression screw, the lag screw and the femoral neck bone fracture plate are implanted into a bone, the hole shoulder of the compression hole enables the compression screw to rotate in situ, the compression screw is rotated to drive the lag screw to move in the direction of withdrawing from the bone, namely, the femoral head on the external thread at the front end of the lag screw moves towards the fracture, and finally, the femoral head provides resetting compression for the fracture. And finally, the tail cap is screwed in the rear end of the compression screw, so that the compression screw has the function of better preventing the compression screw from withdrawing from the compression hole of the femoral neck bone fracture plate, and the tension screw is not easy to withdraw from the tension hole of the femoral neck bone fracture plate due to the threaded matching between the tension screw and the compression screw. The lag screw and the compression screw are matched with each other, and the axes of the lag screw and the compression screw are in the same vertical plane and are parallel to each other, so that the structure can lead the lag screw and the compression screw to jointly bear most of the weight of the upper body of a human body in the same direction, and has better bending resistance; the arc grooves of the lag screw are arranged side by side to partially accommodate the compression screws, so that the cross sections of the compression screws form special-shaped sections, and the sections can prevent the femoral head from rotating relative to the lag screw, so that the lag screw has anti-rotation capacity.
In the femoral neck fixation assembly, the diameter of the lag screw is larger than the diameter of the compression screw.
In the femoral neck fixing component, the thread teeth of the arc groove and the thread of the screw are trapezoidal threads.
In the femoral neck fixing component, the thread teeth of the arc groove are close to the tail part of the tension screw.
In the femoral neck fixing component, the insertion part and the attachment plate are fixedly connected at an angle of 130 °. The femur neck bone fracture plate with the angle is suitable for the anatomical structure of the femur of Chinese people.
In the femoral neck fixing component, the attaching plate is provided with a locking hole.
In the femoral neck fixing component, a through hole is axially formed in the tension screw. The through hole penetrates through the guide pin to play a role in guiding the lag screw.
In the above femoral neck fixing component, the first groove of the compression screw is a hexagon socket groove, a straight groove, a quincuncial groove or a star-shaped groove.
Compared with the prior art, the femoral neck fixing component of the utility model has the following beneficial effects:
(1) the lag screw and the compression screw are matched with each other, and the axes of the lag screw and the compression screw are in the same vertical plane and are parallel to each other, so that the structure can lead the lag screw and the compression screw to jointly bear most of the weight of the upper part of the human body in the same direction, and has better bending resistance.
(2) The arc grooves of the lag screw are arranged side by side to partially accommodate the compression screws, so that the cross sections of the compression screws form special-shaped sections, and the structure can prevent the femoral head from rotating relative to the lag screw, so that the lag screw has anti-rotation capacity.
(3) Through the downthehole screw in tail cap of pressurization at the thighbone neck coaptation board, make the compression screw have the downthehole function of preventing withdrawing from of pressurization of better follow thighbone neck coaptation board, because use through screw-thread fit between lag screw and compression screw to make lag screw also more difficult follow the downthehole deviating from of lag screw of thighbone neck coaptation board, have and prevent withdrawing the nail ability.
(4) The femoral neck fixing component has the bending resistance, the rotation resistance and the nail withdrawal prevention capability at the same time.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is an exploded view of a femoral neck fixation assembly in accordance with an embodiment of the present invention;
FIG. 2 is an assembly view of a femoral neck fixation assembly in accordance with an embodiment of the present invention;
fig. 3 is a cross-sectional view of a femoral neck bone plate according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lag screw according to an embodiment of the present invention;
fig. 5 is a schematic view of an application of the femoral neck fixation assembly according to an embodiment of the present invention;
fig. 6 is a schematic view illustrating that the first groove is a plum blossom groove according to the embodiment of the present invention;
fig. 7 is a schematic view illustrating the first groove is a star-shaped groove according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1-7, the femoral neck fixation assembly 5 of the present embodiment includes a femoral neck bone plate 1, a lag screw 2, a compression screw 3, and a tail cap 4, the lag screw 2 and compression screw 3 being sized and dimensioned for insertion into a femoral head 6.
As shown in fig. 1-7, the compression screw 3 is composed of a screw 31 at the front end and a cylinder 32 at the rear end, the diameter of the cylinder 32 is slightly larger than that of the screw 31, a first groove is provided on the end surface of the cylinder 31, the first groove in this embodiment is a socket head 33, the socket head 33 is used for a hex driver to screw the compression screw 3 into and out of a bone, the first groove can be a straight groove 33 or a plum blossom groove 33 (as shown in fig. 6) or a star groove 33 (as shown in fig. 7), and the grooves with different shapes have the same function as the socket head.
As shown in fig. 1 and 4, the front end of the lag screw 2 is provided with an external thread 21, the outer peripheral surface is provided with an arc groove 22, the axis of the arc groove 22 is parallel to the axis of the lag screw 2, and the axes of the both are in the same vertical plane, the tail end of the lag screw 2 is provided with a straight groove 24 into which a straight screwdriver can be inserted, the arc groove 22 is provided with a trapezoidal thread 23 matched with the screw rod 31 of the compression screw 3, and in order to reduce the mechanical performance of the lag screw 2 less, the trapezoidal thread 23 is preferably arranged in the arc groove 22 near the straight groove 24 side; the thread of the compression screw 3 is easily deformed by pressing the tension screw 2 by the femoral head and pressing the thread of the compression screw shank 31 by the femoral head, and it is preferable to use a trapezoidal thread for the thread of the compression screw shank 31 in order to reduce the thread deformation of the compression screw 3. Furthermore, the axial direction of the lag screw 2 is provided with a through hole which passes through the guide pin to guide the lag screw.
As shown in fig. 1-3, the femoral neck bone fracture plate 1 is composed of a plug part 11 and an abutting plate 12, wherein the plug part 11 and the abutting plate 12 are fixedly connected at an angle of 125-135 degrees, preferably at an angle of 130 degrees, which is more suitable for the anatomical structure of the Chinese; the femoral neck bone fracture plate 1 is provided with a tension hole 13 which simultaneously penetrates through the insertion part 11 and the attachment plate 12 and is used for installing the tension screw 2 and a pressurizing hole 14 for installing the pressurizing screw 3, the tension hole 13 and the pressurizing hole 14 are partially overlapped (namely two holes are communicated), a hole shoulder 15 which is jointed with a cylinder 31 of the pressurizing screw 3 is arranged in the pressurizing hole 14, and the hole wall of the pressurizing hole 14 which is jointed with the cylinder 31 of the pressurizing screw 3 is provided with an internal thread 17. The plug-in part 11 not only has the function of guiding the lag screw 2 and the compression screw 3, but also has the function of further enhancing the bending resistance of the lag screw 2. The tension hole 13 may be above or below the pressure hole 14, and in this embodiment, the tension hole 13 is above the pressure hole 14, and the pressure hole 14 is below the tension hole 13. In order to secure the femoral neck bone plate 1 to the bone, locking holes 16 are further provided in the abutment plate 12. Further, in order to increase the mechanical performance of the lag screw, the diameter of the lag screw 2 is larger than that of the compression screw shank 31.
It should be noted that the tension hole 13 has no internal thread, and the pressurizing hole 14 has no internal thread at the position where it is engaged with the screw 31. In addition, the trapezoidal thread 23 of the arc groove 22 is arranged at the side close to the straight groove 24, because the trapezoidal thread 23 at the position is arranged in the plug part 11 after being assembled, the mechanical performance of the lag screw cannot be reduced.
As shown in fig. 1, the outer circumferential surface of the tail cap 4 is provided with an external thread matched with the internal thread 17 of the pressurizing hole 14, the tail portion of the tail cap is provided with an inner hexagonal groove convenient for the tail cap to be screwed in and out, the inner hexagonal groove can be also set as a straight groove, a plum blossom groove or a star groove according to actual needs, and the shape of the inner hexagonal groove, the straight groove, the plum blossom groove or the star groove at the tail portion of the tail cap 4 is the same as the shape of the first groove of the pressurizing screw 3. The tail cap 4 is screwed into the compression hole 14 to prevent the lag screw 2 from being removed from the lag hole 13 of the femoral neck bone plate 1.
As shown in fig. 5, the weight G of the upper body of the human body is decomposed into a pressing force F1 against the tension screw 2 and a pulling force F2 in the axial direction of the tension screw 2, and the pressing force F1 is greater than the pulling force F2. Wherein the compression force F1 has the effect of bending the lag screw 2 and the tension force F2 has the effect of withdrawing the lag screw 2 from the femur. In the femoral neck fixing component 5 of the present embodiment, the lag screw 2 and the compression screw 3 are in threaded fit with each other, and the axes of the lag screw 2 and the compression screw 3 are in the same vertical plane and parallel to each other, so that the structure enables the lag screw 2 and the compression screw 3 to jointly bear most of the upper body pressure F1 of the human body in the same direction, and has better bending resistance; the compression screws 3 are partially accommodated in parallel through the arc grooves 22 of the lag screw 2, so that the cross sections of the compression screws 3 form special-shaped sections which can prevent the femoral head 6 from rotating relative to the lag screw 2, and the lag screw 2 has anti-rotation capacity; through the tail cap 4 of screwing in the pressurization hole 14 of thighbone neck coaptation board 1, make compression screw 3 have the function of preventing withdrawing from in the pressurization hole 14 of thighbone neck coaptation board 1 better, because use through screw thread fit between lag screw 2 and compression screw 3 to make lag screw 2 also be difficult for deviating from in the lag hole 13 of thighbone neck coaptation board 1, have and prevent moving back the nail ability.
The method of assembly of the femoral neck fixation assembly 5 of the present embodiment is as follows:
firstly, arranging a pre-drilled hole at the proximal end of a femur, and inserting the insertion part 11 of the femoral neck bone fracture plate 1 into the pre-drilled hole;
secondly, inserting a guide pin into the femoral head along a tension hole 13 of the femoral neck bone fracture plate 1, penetrating a tension screw 2 along the guide pin and then screwing the tension screw into the femoral head, wherein an arc groove 22 of the tension screw 2 is positioned at a position matched with the compression screw 3;
thirdly, screwing a compression screw 3 into the compression hole 14 of the femoral neck bone fracture plate 1;
fourthly, screwing a tail cap 4 into the pressurizing hole 14 of the femoral neck bone plate 1 to prevent the tension screw 2 and the pressurizing screw 3 from being separated from the femoral neck bone plate 1;
in a fifth step, bone screws are screwed into the locking holes 16 of the femoral neck bone plate 1.
In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (8)
1. A femoral neck fixation assembly, comprising:
the pressurizing screw consists of a screw rod positioned at the front end and a cylinder positioned at the rear end, the diameter of the cylinder is slightly larger than that of the screw rod, and a first groove is formed in the end face of the cylinder;
the front end of the lag screw is provided with an external thread, the peripheral surface of the lag screw is provided with an arc groove, the tail end of the lag screw is provided with a straight groove, the arc groove is internally provided with a thread tooth matched with a screw rod of the compression screw, the axis of the arc groove is parallel to the axis of the lag screw, and the axes of the arc groove and the lag screw are in the same vertical plane;
the femur neck bone fracture plate is composed of an insertion part and an attaching plate, the insertion part and the attaching plate are fixedly connected at an angle of 125-135 degrees, a tension hole which penetrates through the insertion part and the attaching plate simultaneously and is used for mounting a tension screw and a pressurizing hole which is used for mounting a pressurizing screw are arranged on the femur neck bone fracture plate, the tension hole is communicated with the pressurizing hole, a hole shoulder which is connected with a cylinder of the pressurizing screw is arranged in the pressurizing hole, and an internal thread is arranged on the hole wall of the pressurizing hole which is connected with the cylinder of the pressurizing screw;
the outer peripheral surface of the tail cap is provided with an external thread matched with the internal thread of the pressurizing hole, and the tail cap is screwed into the pressurizing hole to prevent the lag screw from falling out of the lag hole of the femoral neck bone fracture plate;
the lag and compression screws are sized and dimensioned for insertion into a femoral head.
2. The femoral neck fixation assembly of claim 1 wherein the lag screw has a diameter greater than a diameter of the compression screw.
3. The femoral neck fixation assembly of claim 1, wherein the teeth of the arcuate groove and the threads of the threaded rod are trapezoidal threads.
4. The femoral neck fixation assembly of claim 1 wherein the socket and abutment plate are in a 130 ° fixed connection.
5. The femoral neck fixation assembly of claim 4 wherein the abutment plate has a locking aperture therein.
6. The femoral neck fixation assembly of claim 1 wherein the rounded groove has a thread tooth proximate a tail portion of the lag screw.
7. The femoral neck fixation assembly of claim 1 wherein the lag screw is axially provided with a through bore.
8. The femoral neck fixation assembly of claim 1 wherein the first recess of the compression screw is a socket head or a straight recess or a quincunx recess or a star recess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022878221.2U CN214208466U (en) | 2020-12-03 | 2020-12-03 | Femoral neck fixing component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022878221.2U CN214208466U (en) | 2020-12-03 | 2020-12-03 | Femoral neck fixing component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214208466U true CN214208466U (en) | 2021-09-17 |
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ID=77701789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022878221.2U Active CN214208466U (en) | 2020-12-03 | 2020-12-03 | Femoral neck fixing component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214208466U (en) |
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2020
- 2020-12-03 CN CN202022878221.2U patent/CN214208466U/en active Active
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