Femoral osteotomy guide plate for knee joint replacement
By replacing the femoral osteotomy guide plate with knee joint, the problem of unstable and large errors during osteotomy in the prior art is solved, and higher osteotomy accuracy and surgical success rate are achieved.
Patent Information
- Application Number
- CN202421707589.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-18
AI Technical Summary
When the existing knee replacement femoral osteotomy guide plate is oscillated, the bone nails on the cantilever are perpendicular to the direction of the osteotomy, which causes the cutting depth to interfere with the bone nail. After fixing, the bone nails need to be pulled out and then osteotomy is osteotomy. The guide plate is unstable, resulting in an error in the position of the osteotomy and affecting the surgical effect.
A knee replacement femoral osteotomy guide plate was designed, and a third positioning hole with an inclined setting on the main body of the guide plate was added to form a triangular stabilization structure, a cross beam was added to enhance the strength of the cantilever, and a guide block and force line trough were set to improve the accuracy and stability of the osteotomy.
Through the design of inclined positioning holes and cross beams, the fixing stability of the guide plate is improved, the error during osteotomy is reduced, and the success rate of the surgery is enhanced.
Smart Images
Figure CN222997904U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical instruments, and relates to a femoral osteotomy guide plate, in particular to a femoral osteotomy guide plate for knee joint replacement. Background Art
[0002] The osteotomy guide plate for knee joint replacement is a surgical auxiliary tool. By using the guide plate, there is no need to open the medullary cavity, reducing surgical trauma. The femoral osteotomy guide plate in the prior art includes a guide plate body and two cantilevers arranged on the guide plate body. Fitting surfaces are provided on both the guide plate body and the two cantilevers, and two positioning holes are provided on the guide plate body. One positioning hole is provided on each of the two cantilevers. Four bone nails are respectively driven into the four positioning holes to fix the guide plate, and then the fitting degree between the guide plate and the femur is verified. If it can be completely fitted, osteotomy is performed through the osteotomy groove on the guide plate body.
[0003] The disadvantages of the above osteotomy guide plate structure are as follows: Since the bone nails on the two cantilevers are perpendicular to the osteotomy direction, during osteotomy, the cutting depth will interfere with the two bone nails. Therefore, after the guide plate is fixed, the bone nails on the two cantilevers need to be pulled out before osteotomy. During osteotomy, the blade needs to be repeatedly moved in the osteotomy groove, and the remaining two bone nails on the guide plate body are not enough to support the stability of the guide plate, resulting in the deviation of the guide plate and causing errors in the osteotomy position, affecting the surgical effect. Summary of the Utility Model
[0004] In order to solve the above deficiencies in the prior art, the utility model aims to provide a femoral osteotomy guide plate for knee joint replacement to achieve the purpose of accurate positioning of the guide plate without deviation and improve the accuracy of osteotomy.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] A femoral osteotomy guide plate for knee joint replacement includes a guide plate body and two cantilevers fixedly arranged on the guide plate body. Two first positioning holes are provided on the guide plate body, second positioning holes are provided on both of the two cantilevers, and an osteotomy groove is provided on the guide plate body; a third positioning hole is further provided on the guide plate body, and the third positioning hole is inclined along the thickness direction of the guide plate body.
[0007] As a limitation of the utility model, the inclination angle of the third positioning hole is 5 - 15°.
[0008] As a further limitation of the utility model, a cross beam is provided between the two cantilevers, and both ends of the cross beam are fixedly arranged on the two cantilevers respectively.
[0009] As another limitation of the utility model, a guide block is fixedly arranged at the position of the osteotomy groove of the guide plate body, and the osteotomy groove penetrates through the guide block.
[0010] As a limitation of the present utility model, a force groove is provided on the guiding block.
[0011] Due to the adoption of the above technical solution, compared with the prior art, the beneficial effects achieved by the present utility model are as follows:
[0012] (1) The present utility model adds a third positioning hole arranged obliquely. On the one hand, it can form a triangular stable structure with the two first positioning holes on the guide plate body, reducing the degrees of freedom of the guide plate. On the other hand, the inclined angle can improve the positioning effect of the guide plate, prevent the guide plate from moving away from the femur under the drive of the blade, greatly improve the stability of the guide plate fixation, improve the accuracy of the osteotomy position, and increase the success rate of the operation;
[0013] (2) The arrangement of the cross beam in the present utility model is beneficial to increasing the strength of the two cantilevers, preventing the two cantilevers from deforming during osteotomy and causing the osteotomy groove to shift;
[0014] (3) The arrangement of the guiding block in the present utility model increases the thickness of the osteotomy groove, which is beneficial to increasing the stability of the blade cutting during osteotomy, preventing the blade from swinging up and down, and improving the accuracy of osteotomy;
[0015] (4) By arranging the force groove on the guiding block in the present utility model, the setting of other components can be reduced, and the overall weight can be reduced.
[0016] In summary, the present utility model can improve the stability of the guide plate fixation, improve the accuracy of osteotomy, and is applicable to femoral osteotomy. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.
[0018] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present utility model;
[0019] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of the present utility model placed on the femur;
[0020] Figure 3 It is a sectional structural schematic diagram of the setting direction of the third positioning hole on the guide plate body in an embodiment of the present utility model.
[0021] In the figure: 1. Guide plate body; 11. First fitting surface; 2. Cantilever; 21. Second fitting surface; 3. First positioning hole; 4. Second positioning hole; 5. Third positioning hole; 6. Guiding block; 7. Osteotomy groove; 8. Force groove; 9. Cross beam; 10. Femur. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] The preferred embodiments of the present utility model will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and understanding the present utility model, and are not used to limit the present utility model.
[0023] Embodiment A femoral osteotomy guide plate for knee joint replacement
[0024] As Figure 1 , Figure 2 shown, this embodiment includes a guide plate body 1 and two cantilevers 2 fixedly arranged on the guide plate body 1. The guide plate body 1 is provided with a first fitting surface 11, and the guide plate body 1 is provided with an osteotomy groove 7. Both of the two cantilevers 2 are provided with a second fitting surface 21. The structures of the above-mentioned guide plate body 1 and the cantilevers 2 are all prior arts and will not be elaborated in detail. Fit the first fitting surface 11 on the guide plate with the lateral bone surface of the femur 10, and ensure that the second fitting surface 21 fits with the upper bone surface of the femur, so that the guide plate fits on the femur 10. At this time, the position of the osteotomy groove 7 on the guide plate body 1 is the position where osteotomy is required. After the guide plate is fixed, insert a blade into the osteotomy groove 7 to perform osteotomy on the femur 10.
[0025] The guide plate body 1 is provided with two first positioning holes 3. The two first positioning holes 3 are arranged on both sides of the guide plate body 1, and both of the two first positioning holes 3 penetrate through the thickness direction of the guide plate body 1. The guide plate body 1 is further provided with a third positioning hole 5. The third positioning hole 5 is arranged below the two first positioning holes 3 and forms a triangular structure with the two first positioning holes 3. As Figure 3 shown, the third positioning hole 5 penetrates through the thickness direction of the guide plate body 1 and penetrates from the front surface of the guide plate body 1 to the surface of the first fitting surface 11. The third positioning hole 5 is inclined along the thickness direction of the guide plate body 1, and the inclination angle is 5-15°. The inclination angle of this embodiment is 10°. After driving a bone nail into the third positioning hole 5, the guide plate body 1 will not move away from the femur 10 under the shaking of the blade. Coupled with the triangular structure formed with the first positioning holes 3, the stability of the guide plate fixation is further improved.
[0026] A guide block 6 is fixedly arranged at the position of the osteotomy groove 7 of the guide plate body 1. The guide block 6 is a cuboid, with a part on one side of the guide plate body 1 and the other part on the other side of the guide plate body 1. The osteotomy groove 7 penetrates through the guide block 6. The setting of the guide block 6 increases the thickness of the position of the osteotomy groove 7 on the guide plate body 1 and extends the length of the osteotomy groove 7, which can play a better guiding role for the blade during osteotomy. The guide block 6 is provided with a force line groove 8. The force line groove 8 is arranged along the thickness direction of the guide block 6 and is located in the middle of the guide block 6, and is used to insert a force line rod to check the accuracy of the guide plate fixation.
[0027] Second positioning holes 4 are provided on both of the two cantilevers 2, and both of the two second positioning holes 4 penetrate through the thickness direction of the cantilever 2 from the second fitting surface 21 of the cantilever 2. A cross beam 9 is provided between the two cantilevers 2, and both ends of the cross beam 9 are fixedly arranged on the two cantilevers 2 respectively. Since the cantilevers 2 are relatively long, the arrangement of the cross beam 9 can improve the structural strength of the two cantilevers 2 and prevent the cantilevers 2 from deforming during osteotomy.
[0028] When using this embodiment, the first fitting surface 11 of the guide plate body 1 is attached to the fitting area of the femoral bone 10 side bone surface, and it is ensured that the second fitting surfaces 21 on the two cantilevers 2 are attached to the fitting area of the upper bone surface of the femoral bone 10. Then, bone nails are driven into the first positioning hole 3, the second positioning hole 4, and the third positioning hole 5 to fix the guide plate on the femoral bone 10. Then, a force line rod is inserted into the force line groove 8 to check the accuracy of the guide plate fixation. If the positioning is accurate, the bone nail in the second positioning hole 4 is removed, and a blade is inserted into the osteotomy groove 7 for osteotomy.
[0029] It should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the above embodiments or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A femoral osteotomy guide for knee replacement, comprising a guide body and two cantilevers fixed on the guide body, the guide body is provided with two first positioning holes, the two cantilevers are provided with second positioning holes, and the guide body is provided with an osteotomy groove; characterized in that: The guide plate body is also provided with a third positioning hole, which is arranged obliquely along the thickness direction of the guide plate body.
2. A femoral osteotomy guide for knee replacement according to claim 1, characterized in that: The inclination angle of the third positioning hole is 5-15°.
3. A femoral osteotomy guide for knee replacement according to claim 2, characterized in that: A crossbeam is arranged between the two cantilevers, and two ends of the crossbeam are respectively fixed on the two cantilevers.
4. A femoral osteotomy guide for knee replacement according to any one of claims 1 to 3, characterized in that: A guide block is fixedly arranged at the position of the osteotomy groove of the guide plate body, and the osteotomy groove penetrates the guide block.
5. A femoral osteotomy guide plate for knee replacement according to claim 4, characterized in that: The guide block is provided with a force line groove.