CN115317203A - Double-compartment knee joint prosthesis - Google Patents

Abstract

The invention discloses a double-compartment knee joint prosthesis, belonging to the technical field of medical prostheses. The prosthesis comprises a double-compartment femoral condyle, a tibial pad and a tibial tray; the double-compartment femoral condyle is mainly composed of a unilateral condyle joint surface It is composed of the anterior condyle surface of the femoral condyle; the middle position of the anterior condyle surface of the femoral condyle has the trochlear groove of the patella; the articular surface of the unilateral condyle is connected with the anterior condyle surface of the femoral condyle, and the two are integrated; The groove structure cooperates, and the combination of the two is located on the lateral side of the articular surface of the unilateral condyle; the inner surface of the double-compartment femoral condyle and the bottom of the tibial tray both have grooves and fixation posts, where the grooves are used to strengthen the bone cement. The bonding strength of human bones, the fixed column is used to insert human bones to ensure the stability of the connection. The invention avoids the excision of the anterior and posterior cruciate ligaments and the collateral ligaments in the knee joint, preserves the function of the knee joint body ligament of the patient, and reduces the adverse reaction of the patient's physiological activities after operation.

Description

A bicompartmental knee prosthesis

technical field

The invention relates to the technical field of medical prosthesis, in particular to a double-compartment knee joint prosthesis.

Background technique

The correct specifications of the knee prosthesis, that is, the morphological size is very important for the successful replacement and long-term survival of the artificial total knee joint. Due to the large morphological differences between different races, commercial prostheses may not have specifications suitable for Chinese people. When the existing device is used, the fixing effect after installation is poor, and it is prone to loosening, causing the prosthesis to fail and even the user to be injured, and the specifications and structures of human joints are different.

The dual-chamber knee joint prosthesis in the prior art cannot simultaneously solve patellar arthritis and unicondylar joint inflammation; and it has resection damage to the knee joint ligament during knee joint prosthesis replacement.

Contents of the invention

In view of this, the present invention provides a double-compartment knee joint prosthesis, which avoids the resection of the anterior and posterior cruciate ligaments and collateral ligaments in the knee joint, retains the function of the patient's knee joint body ligament; Adverse reactions to physiological activities.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A double-compartment knee joint prosthesis, comprising a double-compartment femoral condyle 1, a tibial liner 2 and a tibial support 3; the double-compartment femoral condyle is mainly composed of a unilateral condyle articular surface and an anterior femoral condyle surface; The middle position of the anterior condyle surface of the femoral condyle has a patella trochlear groove; the articular surface of the unilateral condyle is connected with the anterior condyle surface of the femoral condyle, and the two are integrated structures;

The tibial liner and the tibial tray are matched through a slot structure, and the combination of the two is located on the outside of the articular surface of the unilateral condyle;

Both the inner surface of the femoral condyle of the two compartments and the bottom of the tibial support have grooves and fixing posts, wherein the grooves are used to strengthen the bonding strength between bone cement and human bone, and the fixing posts are used to insert human bones to ensure stable connection sex.

Further, the material of the bicompartmental femoral condyle is cobalt-chromium-molybdenum alloy.

Further, the material of the tibial liner is VE highly cross-linked ultra-high molecular weight polyethylene.

Further, the material of the tibial tray 3 is titanium alloy.

Further, the curvature of the patella trochlear groove is the same as the physiological curvature of the articular surface of the human femoral condyle.

Further, the lower surface of the tibial pad is provided with a locking protrusion, and the upper surface of the tibial tray is provided with a locking groove; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial pad, and the locking groove There is a horizontal groove corresponding to the extension on the same side of the bone; the tibial liner is inserted from one side of the femoral tray, and the extension is located in the horizontal groove when the two are locked.

Further, the curvature of the articular surface of the unilateral condyle is the same as the physiological curvature of the articular surface of the human femoral condyle.

The beneficial effect that the present invention produces by adopting above-mentioned technical scheme is:

1. The design of the double-compartmental femoral condyle in this technology is to solve the disease of patients suffering from patellar arthritis and unilateral femoral condyle osteoarthritis, and replace the existing total knee joint replacement plan, and carry out the treatment for the disease of the patella and unilateral femoral condyle. Replacement repair.

2. The structural design of the double-compartmental femoral condyle, tibial liner, and tibial support in this technology can be used for surgical treatment in patients, avoiding the resection of the anterior and posterior cruciate ligaments and collateral ligaments in the knee joint, and retaining the original ligaments of the knee joint. Function.

3. In this technology, the unilateral condylar articular surface and the patella trochlear groove of the bicompartmental femoral condyle are designed according to the biology of the human femoral condyle to reduce the adverse reaction of the patient's postoperative physiological activities.

4. In this technology, the two-compartment femoral condyle, tibial liner, and tibial tray have a combination of metal-polyethylene-metal, which reduces the wear between metal and metal, and the material of the tibial liner is VE high cross-linked polymer. Vinyl, better wear resistance and biocompatibility, prolongs the service life of the prosthesis.

5. In this technology, the locking groove 31 and the locking protrusion 21 are designed to slide in on one side. This combination method reduces the difficulty of the doctor in the assembly process and reduces the damage to the tibial liner of the polyethylene component during the assembly process. .

6. The setting of the fixed column and the groove in this technology promotes the stable strength of the prosthesis when the bone cement is fixed.

Description of drawings

Fig. 1 is the installation structure schematic diagram of the embodiment of the present invention;

Fig. 2 is the structure explosion diagram of the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a second viewing angle in Fig. 2;

FIG. 4 is a schematic structural diagram of a third viewing angle in FIG. 2 .

Fig. 5 is a schematic structural view of the tibial pad in Fig. 2 .

Fig. 6 is a schematic structural view of the tibial support in Fig. 2 .

In the figure: 1. Bicompartmental femoral condyle, 2. Tibial liner, 3. Tibial support, 14. Patella trochlear groove, 11, 33. Groove, 12, 32. Fixed post, 31. Locking groove, 21 , locking protrusion, 13, articular surface of unilateral condyle, 22, extension, 34, horizontal groove.

Detailed ways

Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art Generally speaking, other drawings can also be obtained based on these drawings on the premise of not paying creative work.

A double-compartment knee joint prosthesis, comprising a double-compartment femoral condyle 1, a tibial liner 2 and a tibial support 3; the double-compartment femoral condyle is mainly composed of a unilateral condyle articular surface and an anterior femoral condyle surface; The middle position of the anterior condyle surface of the femoral condyle has a patella trochlear groove; the articular surface of the unilateral condyle is connected with the anterior condyle surface of the femoral condyle, and the two are integrated structures;

The tibial liner and the tibial tray are matched through a slot structure, and the combination of the two is located on the outside of the articular surface of the unilateral condyle;

Both the inner surface of the femoral condyle of the two compartments and the bottom of the tibial support have grooves and fixing posts, wherein the grooves are used to strengthen the bonding strength between bone cement and human bone, and the fixing posts are used to insert human bones to ensure stable connection sex.

Further, the material of the bicompartmental femoral condyle is cobalt-chromium-molybdenum alloy.

Further, the material of the tibial liner is VE highly cross-linked ultra-high molecular weight polyethylene.

Further, the material of the tibial tray 3 is titanium alloy.

Further, the curvature of the patella trochlear groove is the same as the physiological curvature of the articular surface of the human femoral condyle.

Further, the lower surface of the tibial pad is provided with a locking protrusion, and the upper surface of the tibial tray is provided with a locking groove; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial pad, and the locking groove There is a horizontal groove corresponding to the extension on the same side of the bone; the tibial liner is inserted from one side of the femoral tray, and the extension is located in the horizontal groove when the two are locked.

Further, the curvature of the articular surface of the unilateral condyle is the same as the physiological curvature of the articular surface of the human femoral condyle.

Below is a more specific embodiment:

Referring to FIGS. 1 to 6 , the present embodiment consists of a bicompartmental femoral condyle 1 , a tibial pad 2 and a tibial support 3 , as shown in FIGS. 1 to 4 . The material of the femoral component 1 is cobalt-chromium-molybdenum alloy, the material of the tibial liner 2 is VE high cross-linked ultra-high molecular weight polyethylene, and the material of the tibial tray 3 is titanium alloy.

The double-compartment femoral condyle 1 is designed according to the biological characteristics of the Chinese knee joint femur. The unilateral condylar articular surface 13 and the patella trochlear groove 14 conform to the physiological curvature of the human femoral condyle articular surface, and all ligaments of the knee joint can be preserved during the osteotomy;

Osteotomy was performed on the femoral condyle of the patient according to the internal surface structure of the prosthesis, the femoral condyle was drilled, and bone cement was applied to the inner surface of the bicompartmental femoral condyle and installed on the femoral condyle of the patient. The groove 11 was designed to strengthen the contact between the bone cement and the human bone The bonding strength is high, and the fixed column 12 ensures the stability of the prosthesis after implantation;

Carry out osteotomy and perforation on the patient's tibia according to the structural design of the tibial support 3, select the appropriate model and specification tibial support 3 through the trial model, the design of the lower surface groove 33 and the fixed column 32 ensures the stable installation of the tibial support 3 on the human tibia sex;

After selecting a suitable tibial tray 3, select a tibial liner 2 with a suitable thickness according to the trial model, and perform assembly and locking through the locking convex groove 21 and the locking groove 31;

Bone cement is applied to the lower surface of the tibial tray 3, and the locked tibial plateau is implanted into the patient's tibia to complete the prosthesis implantation, followed by surgical suturing.

5 to 6, the lower surface of the tibial pad is provided with a locking protrusion, and the upper surface of the tibial tray is provided with a locking groove; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial pad, locking The same side of the groove is provided with a horizontal groove corresponding to the extension; the tibial liner is inserted from one side of the femoral tray, and the extension is located in the horizontal groove when the two are locked.

Double-compartmental femoral condyle 1. The lower surface of the tibial tray can increase the bone trabecular structure through 3D printing technology, prolong the service life of the prosthesis through human bone self-growth, and avoid allergies and particle problems that may be caused by bone cement fixation.

Claims (7)

1. A bicompartmental knee prosthesis is characterized by comprising a bicompartmental femoral condyle (1), a tibial gasket (2) and a tibial tray (3); the double compartment femoral condyle mainly comprises a unilateral condyle joint surface and a femoral condyle anterior condyle surface; the middle position of the femoral condyle anterior condyle surface is provided with a patellar sliding groove; the unilateral condyle joint surface is connected with the femoral condyle anterior condyle surface and has an integrated structure;

the tibia liner is matched with the tibia support through a clamping groove structure, and a combination of the tibia liner and the tibia support is positioned on the outer side of the unilateral condyle articular surface;

the inner surface of the double-compartment femoral condyle and the bottom of the tibial tray are provided with a groove and a fixing upright post, wherein the groove is used for enhancing the bonding strength of bone cement and human bones, and the fixing upright post is used for being inserted into human bones to ensure the connection stability.

2. The bicompartmental knee prosthesis of claim 1, wherein the material of the bicompartmental femoral condyle is cobalt chromium molybdenum alloy.

3. The bicompartmental knee prosthesis of claim 1, wherein the material of said tibial insert is VE high cross-linked ultra-high molecular weight polyethylene.

4. A bicompartmental knee prosthesis according to claim 1, characterized in that the material of the tibial tray (3) is a titanium alloy.

5. The bicompartmental knee prosthesis of claim 1, wherein the curvature of the patellar trochlear groove is the same as the physiological curvature of the human femoral condyle articular surface.

6. A bicompartmental knee prosthesis according to claim 1, wherein the lower surface of the tibial gasket is provided with a locking projection, and the upper surface of the tibial tray is provided with a locking groove; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial gasket, and the same side of the locking groove is provided with a horizontal groove corresponding to the extension; the tibia liner is inserted from one side of the femur support, and under the locking state of the tibia liner and the femur support, the tibia liner extends to be positioned in the horizontal groove.

7. The bicompartmental knee prosthesis of claim 1, wherein the curvature of said unilateral condyle articular surface is the same as the physiological curvature of the human femoral condyle articular surface.

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