A posterior cruciate ligament replacement intercondylar osteotomy module

Abstract

The utility model relates to medical instrument technical field especially intercondylar osteotomy module of posterior cruciate ligament replacement type, including bottom plate, front condyle positioning board, rear condyle positioning board, front bevel positioning board and rear bevel positioning board, front bevel positioning board and rear bevel positioning board are located respectively in bottom plate both sides, rear condyle positioning board is located rear side at rear bevel positioning board, front condyle positioning board is located front side at front bevel positioning board, the appearance of front condyle positioning board is the shape after left condyle outer contour and right condyle outer contour middle part superposition, a plurality of front condyle positioning board fixed holes are equipped with in the upper portion of superposition part of front condyle positioning board, a plurality of front condyle positioning board fixed holes both sides are equipped with window respectively, and the inner edge of two windows corresponds respectively with left condyle or right condyle inner edge, front condyle positioning board lower part is provided with the guide groove of through module body. The utility model provides the instrument function integration of high, and it is helpful to realize the flexible switching between two kinds of mainstream osteotomy mode of swing saw osteotomy and bone drill osteotomy.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a posterior cruciate ligament replacement intercondylar osteotomy module. Background Technology

[0002] Total knee replacement surgery is a treatment method used when the knee joint is damaged. Artificial femoral condyle prostheses are divided into two types based on different design theories: posterior cruciate ligament (PS) replacement and posterior cruciate ligament (CR) preservation. For the PS replacement type, the implantation process in the operating room requires osteotomy to remove bone from the intercondylar region of the femur, creating a rectangular space to facilitate implantation and avoid interference. After completing distal femoral osteotomy, anterior condylar osteotomy, posterior condylar osteotomy, and anterior and posterior oblique osteotomy, intercondylar osteotomy is necessary. This requires suitable surgical instruments for precise, rapid, and labor-saving osteotomy to remove bone in this area, saving surgical time and reducing the possibility of bleeding and complications.

[0003] In surgical procedures, osteotomy with a bone drill is usually preferred over oscillating saw osteotomy due to its ease of operation. However, when the patient's bone is hard (e.g., with excessively high bone density), making it difficult to guide the bone drill, obstructing its entry, or when the bone chisel cannot effectively penetrate, it is necessary to switch to oscillating saw osteotomy to complete the osteotomy. Currently available intercondylar osteotomy modules have significant limitations in functional integration and cannot flexibly switch between the two mainstream osteotomy methods of oscillating saw osteotomy and bone drill osteotomy. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a posterior cruciate ligament replacement intercondylar osteotomy module with high functional integration and to facilitate flexible switching between the two mainstream osteotomy methods of oscillating saw osteotomy and bone drill osteotomy.

[0005] This utility model is achieved through the following solution:

[0006] A posterior cruciate ligament (PCL) replacement intercondylar osteotomy module includes a module body. The module body includes a base plate, an anterior condylar positioning plate, a posterior condylar positioning plate, an anterior oblique positioning plate, and a posterior oblique positioning plate. The anterior oblique positioning plate and the posterior oblique positioning plate are respectively fixedly and obliquely on the front and rear sides of the base plate. The posterior condylar positioning plate is fixedly located on the rear side of the posterior oblique positioning plate, and the anterior condylar positioning plate is fixedly located on the front side of the anterior oblique positioning plate. The shape of the anterior condylar positioning plate is the superposition of the middle part of the outer contour of the left and right condyles. The anterior condylar positioning plate has multiple anterior condylar positioning plate fixing holes on the upper part of the superposition of the middle part of the outer contour of the left and right condyles. Viewing windows are provided on the non-superpositioned parts on both sides of the multiple anterior condylar positioning plate fixing holes, and the inner edges of the two viewing windows correspond to the inner edges of the corresponding left or right condyles. The module body has a guide groove penetrating the module body in the lower part of the anterior condylar positioning plate.

[0007] The optimized design features three fixing holes for the anterior condyle positioning plate, with one hole located on the center line of the anterior condyle positioning plate and the other two holes positioned near the inner edges of the two viewing windows.

[0008] The optimized anterior condyle positioning plate has an upper outer edge shape and size that are consistent with the outer edge shape and size of the femoral condyle prosthesis to be installed.

[0009] Furthermore, the base plate has a base plate fixing hole and a base plate positioning hole on both sides of the guide groove, and the base plate fixing hole is an oblique hole.

[0010] Furthermore, the front inclined positioning plate is symmetrically provided on both sides of the guide groove, and the front inclined positioning plate is a stepped hole.

[0011] Furthermore, the guide groove is fixedly provided with an upper stop bar and two side plates to form a limiting space for the guide groove.

[0012] The optimized design places the upper retaining strip parallel to the intercondylar cascade of the femoral condyle prosthesis.

[0013] Furthermore, the inner sides of the two side plates are respectively provided with gripper fixing grooves, and the upper ends of the two side plates are provided with gripper positioning grooves.

[0014] Beneficial effects of the utility model:

[0015] The posterior cruciate ligament replacement intercondylar osteotomy module provided by this utility model has the following advantages:

[0016] (1) The posterior cruciate ligament replacement intercondylar osteotomy module can make better contact with the osteotomy surface of the distal femur after the distal osteotomy, which is beneficial for subsequent positioning osteotomy and other operations.

[0017] (2) The anterior condyle positioning plate of the posterior cruciate ligament replacement intercondylar osteotomy module is designed by superimposing the shape of the left and right condyle trial molds of the same type. By superimposing the anatomical features of the bilateral condyle trial molds, the anterior condyle positioning plate is universally applied in left and right side surgery. In addition, the design of the viewing window makes it easy to observe the fit between the anterior condyle positioning plate and the anterior condyle osteotomy surface during the operation.

[0018] (3) The design of the guide groove can realize the quick assembly and disassembly of the module body and the guide module, which helps the collaborative mechanism of hollow drilling roughing and bone chiseling fine finishing, and realizes the need to switch between two different osteotomy methods. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the assembly structure of the module body and the gripper of this utility model.

[0021] Figure 3 This is a schematic diagram of the module body, guide module, and bone tissue assembly structure of this utility model.

[0022] In the diagram: 1. Module body; 11. Base plate; 111. Base plate fixing hole; 112. Base plate positioning hole; 12. Posterior condyle positioning plate; 13. Anterior condyle positioning plate; 131. Anterior condyle positioning plate fixing hole; 132. Viewing window; 14. Anterior inclined surface positioning plate; 141. Anterior inclined surface positioning plate; 15. Posterior inclined surface positioning plate; 16. Guide groove; 161. Side plate; 162. Upper stop bar; 163. Holder fixing groove; 164. Holder positioning groove; 2. Guide module; 3. Holder; 4. Bone tissue. Detailed Implementation

[0023] A posterior cruciate ligament replacement intercondylar osteotomy module, the structural diagram of which is shown below. Figure 1 As shown, it includes a module body 1, which includes a base plate 11, an anterior condyle positioning plate 13, a posterior condyle positioning plate 12, an anterior inclined surface positioning plate 14, and a posterior inclined surface positioning plate 15. The anterior and posterior inclined surface positioning plates are respectively fixedly and obliquely on the front and rear sides of the base plate. The posterior condyle positioning plate is fixedly located on the rear side of the posterior inclined surface positioning plate, and the anterior condyle positioning plate is fixedly located on the front side of the anterior inclined surface positioning plate. The shape of the anterior condyle positioning plate is the outer contour of the left condyle and... The shape of the right condyle outer contour after superposition. The anterior condyle positioning plate has multiple anterior condyle positioning plate fixing holes 131 on the upper part of the superposition part of the left condyle outer contour and the right condyle outer contour. On the non-superposition part on both sides of the multiple anterior condyle positioning plate fixing holes, there are windows 132 respectively. The inner edge of the two windows corresponds to the inner edge of the corresponding left condyle or right condyle. The module body has a guide groove 16 that penetrates the module body at the lower part of the anterior condyle positioning plate.

[0024] The module body has a modular structure and can be integrally machined from metal materials, which facilitates manufacturing and processing.

[0025] The module body includes a base plate, anterior condyle positioning plate, posterior condyle positioning plate, anterior inclined positioning plate, and posterior inclined positioning plate. The anterior and posterior inclined positioning plates are fixedly and obliquely on both sides of the base plate. The posterior condyle positioning plate is fixed on the rear side of the posterior inclined positioning plate, and the anterior condyle positioning plate is fixed on the front side of the anterior inclined positioning plate. The base plate, anterior condyle positioning plate, posterior condyle positioning plate, anterior inclined positioning plate, and posterior inclined positioning plate correspond to the five surfaces of the condyle trial mold, which can verify the fit between the medial surface and the bone in advance. The module body can be integrally machined from metal material, which has a certain strength and can shape the bone after osteotomy in the previous surgical procedure, making the bone surface flat and facilitating the smooth installation of the subsequent condyle trial mold. This allows the posterior cruciate ligament replacement intercondylar osteotomy module to have better contact with the bone tissue at the distal end of the femur after distal osteotomy, which is beneficial for subsequent positioning osteotomy and other operations.

[0026] The anterior condyle positioning plate is shaped by overlapping the midpoints of the left and right condyle lateral contours, enabling its universal application in both left and right side surgeries. Multiple fixing holes are provided on the upper part of the overlapping portion of the left and right condyle lateral contours, further facilitating its universal application in both left and right side surgeries and ensuring easy fixation of the anterior condyle positioning plate to the corresponding anterior condyle osteotomy surface.

[0027] Viewing windows are provided on the non-overlapping parts on both sides of the multiple fixation holes, and the inner edges of the two viewing windows correspond to the inner edges of the left or right condyle, respectively. This makes the anterior condyle positioning plate more suitable for universal application in left and right side surgery, and facilitates intraoperative observation of the fit between the anterior condyle positioning plate and the anterior condyle osteotomy surface.

[0028] The optimized design uses three fixation holes for the anterior condyle positioning plate, with one hole located on the center line of the plate and the other two holes positioned near the inner edges of the two viewing windows. This design allows for fixation of the anterior condyle positioning plate to the corresponding anterior condyle osteotomy surface with a minimal number of fixation holes, while ensuring effective fixation.

[0029] The optimized anterior condyle positioning plate has an upper outer edge shape and size that are consistent with the outer edge shape and size of the femoral condyle prosthesis to be installed, which makes the position of the posterior cruciate ligament replacement intercondylar osteotomy module more intuitive and the positioning more accurate during installation.

[0030] Furthermore, the base plate has base plate fixing holes 111 and base plate positioning holes 112 on both sides of the guide groove, and the base plate fixing holes are oblique holes. The base plate fixing holes are oblique holes, which generate a compressive force on the side. When combined with the fixing holes of the anterior condyle positioning plate, this can prevent the posterior cruciate ligament replacement intercondylar osteotomy module from dislodging from the osteotomy surface and prevent the posterior cruciate ligament replacement intercondylar osteotomy module from moving during intercondylar osteotomy, thus preventing inaccurate osteotomy.

[0031] By drilling holes in the base plate positioning holes on the human femur, the posterior cruciate ligament replacement intercondylar osteotomy module is removed from the human femur. This facilitates the insertion of the connecting post on the femoral condyle prosthesis, which is used to connect with the human femur, into the positioning holes on the human femur, thus achieving a good fit and positioning between the femoral condyle prosthesis and the human femur.

[0032] Furthermore, the anterior inclined positioning plate has symmetrically provided anterior inclined positioning plate 141 on both sides of the guide groove, and the anterior inclined positioning plate has stepped holes, which facilitates the fixing of the guide module 2 with fixing pins, so that the guide module is more firmly fixed on the posterior cruciate ligament replacement intercondylar osteotomy module.

[0033] Furthermore, the guide groove is fixedly equipped with an upper stop bar 162 and two side plates 161 to form a limiting space for the guide groove, thereby better enabling two surgical modes: First, without installing the guide module, the operation is performed directly within the limiting space using a saw blade or thin osteotome; Second, the guide module is installed within the limiting space, and then a hollow drill is used for osteotomy within the space confined by the guide module, followed by the use of a bone chisel to shape the intercondylar box. In both surgical modes, the upper stop bar and two side plates can block tools such as saw blades, hollow chisels, and bone chisels, preventing them from deviating and avoiding accidental injury to the intercondyle. A schematic diagram of the assembly structure of the module body, guide module, and bone tissue is shown below. Figure 3 As shown.

[0034] The optimized design places the upper retaining strip parallel to the intercondylar cascade of the femoral condyle prosthesis, rather than parallel to the base plate, which facilitates the precise cutting out of the intercondylar cascade shape.

[0035] Furthermore, each of the two side plates has a holder fixing groove 163 on its inner side, and a holder positioning groove 164 on the upper end of the two side plates. The holder positioning groove facilitates quick positioning of the holder 3, and the holder fixing groove facilitates quick fixation of the posterior cruciate ligament replacement intercondylar osteotomy module to the holder at the holder fixing groove. A schematic diagram of the assembly structure of the module body and the holder is shown below. Figure 2 As shown.

[0036] In summary, the posterior cruciate ligament replacement intercondylar osteotomy module proposed in this utility model has a module body that can make good contact with the osteotomy surface of the distal femur after distal osteotomy. The anterior condylar positioning plate is suitable for universal application in both left and right side surgeries and facilitates intraoperative observation of the fit between the anterior condylar positioning plate and the anterior condylar osteotomy surface. The module body can be equipped with a guide module as needed, which works together to form a limiting space. Then, a hollow drill and bone chisel combined cutting technique can be used. Alternatively, the guide module can be omitted, and the guide groove limiting space formed by the module body can be used directly. The guide groove limiting space directly serves as the saw blade guide osteotomy groove, thereby helping to meet the need to switch between two different osteotomy methods: oscillating saw osteotomy and hollow drill / bone chisel osteotomy.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A posterior cruciate ligament replacement intercondylar osteotomy module, characterized in that: The module body includes a base plate, anterior condyle positioning plate, posterior condyle positioning plate, front inclined surface positioning plate, and rear inclined surface positioning plate. The front inclined surface positioning plate and the rear inclined surface positioning plate are respectively fixedly and obliquely on the front and rear sides of the base plate. The posterior condyle positioning plate is fixedly installed on the rear side of the rear inclined surface positioning plate, and the anterior condyle positioning plate is fixedly installed on the front side of the front inclined surface positioning plate. The shape of the anterior condyle positioning plate is the superposition of the middle part of the outer contour of the left condyle and the outer contour of the right condyle. The anterior condyle positioning plate has multiple anterior condyle positioning plate fixing holes on the upper part of the superposition part of the middle part of the outer contour of the left condyle and the outer contour of the right condyle. Viewing windows are provided on the non-superposition parts on both sides of the multiple anterior condyle positioning plate fixing holes, and the inner edges of the two viewing windows correspond to the inner edges of the corresponding left condyle or right condyle. The module body has a guide groove penetrating the module body at the lower part of the anterior condyle positioning plate.

2. The posterior cruciate ligament replacement intercondylar osteotomy module according to claim 1, characterized in that: The anterior condyle positioning plate has three fixing holes, one of which is located on the center line of the anterior condyle positioning plate, and the other two fixing holes are located near the inner edges of the two viewing windows.

3. The posterior cruciate ligament replacement intercondylar osteotomy module according to claim 1, characterized in that: The shape and size of the outer edge of the upper end of the anterior condyle positioning plate are consistent with the shape and size of the outer edge of the femoral condyle prosthesis to be installed.

4. The posterior cruciate ligament replacement intercondylar osteotomy module according to claim 1, characterized in that: The base plate has a base plate fixing hole and a base plate positioning hole on both sides of the guide groove, and the base plate fixing hole is an oblique hole.

5. The posterior cruciate ligament replacement intercondylar osteotomy module according to claim 1, characterized in that: The front inclined positioning plate has symmetrical front inclined positioning plates on both sides of the guide groove, and the front inclined positioning plate has stepped holes.

6. The posterior cruciate ligament replacement intercondylar osteotomy module according to claim 1, characterized in that: The guide groove is fixedly provided with an upper stop bar and two side plates to form a limiting space for the guide groove.

7. A posterior cruciate ligament replacement intercondylar osteotomy module according to claim 6, characterized in that: The upper retaining strip is arranged parallel to the intercondylar cascade of the femoral condyle prosthesis.

8. A posterior cruciate ligament replacement intercondylar osteotomy module according to claim 6, characterized in that: The inner sides of the two side plates are respectively provided with gripper fixing grooves, and the upper ends of the two side plates are provided with gripper positioning grooves.

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