CN218792650U

CN218792650U - Novel knee joint prosthesis

Info

Publication number: CN218792650U
Application number: CN202221742467.XU
Authority: CN
Inventors: 陈吉
Original assignee: Nanjing Pukou Hospital
Current assignee: Nanjing Pukou Hospital
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2023-04-07
Anticipated expiration: 2032-07-06

Abstract

The utility model provides a novel knee joint prosthesis, which is characterized in that the novel knee joint prosthesis comprises a femur condyle prosthesis, a tibia pad and a tibia support, wherein the femur condyle prosthesis and the tibia support are respectively connected with a first fixing rod and a second fixing rod, the first fixing rod and the second fixing rod are respectively provided with four cylindrical guide grooves, two sides of the joint of the second fixing rod and the tibia support are provided with reinforcing ribs, the tibia pad is arranged on the tibia support, and the femur condyle prosthesis can smoothly rotate on the tibia pad; the utility model discloses utilize simple structure, make knee joint prosthesis the shin hold in the palm with the thighbone condyle prosthesis can be accurate and convenient install in shin bone and thighbone, the shin pad with the installation is stable to be difficult to take place the dislocation between the shin holds in the palm, has fine application prospect.

Description

Novel knee joint prosthesis

Technical Field

The utility model belongs to the technical field of medical equipment and specifically relates to a novel knee joint prosthesis.

Background

The knee joint is the largest, complex anatomical joint with high requirements for motion function of a human body, knee osteoarthritis and rheumatoid arthritis are the most common arthritis of the knee joint, and serious joint deformity and movement disorder occur in the later stage of arthritis, and at the moment, the treatment of total knee joint surface replacement is needed. The artificial total knee joint replacement can relieve joint pain, correct joint deformity and recover joint mobility, is the first choice method for treating knee joint diseases at present, can effectively relieve the knee joint pain after the operation, and can meet the requirement of a patient on pain relief.

In replacing a posterior stabilized knee prosthesis, it is necessary to resect the anterior and posterior cruciate ligaments of the knee. In the design of conventional posterior stabilized knee prostheses, the cam and post structures are often used to replace the posterior cruciate ligament function in order to achieve the goals of guiding the "rolling motion" of the knee and maintaining the kinematic stability of the knee. However, conventional posterior stabilized prostheses are prone to post-operative dislocation or loosening failure during flexion, particularly at high flexion. And conventional posterior stabilized prostheses do not restore the natural motion of the knee joint well.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel knee joint prosthesis to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a novel knee joint prosthesis, its characterized in that includes thighbone condyle prosthesis 1, shin bone pad 2 and shin bone and holds in the palm 3, wherein thighbone condyle prosthesis 1 with first dead lever 11 and second dead lever 31 are connected respectively to shin bone support 3, first dead lever 11 with four cylindrical guide ways are seted up respectively on the second dead lever 31 pole.

The femoral condyle prosthesis 1 is installed at the bottom end of a femur, and the tibial tray 3 is installed on a tibia.

The first fixing rod 11 and the second fixing rod 31 are both in a circular truncated cone shape, one end of the fixing rod close to the femoral condyle prosthesis 1 or the tibial tray 3 is large in diameter, the diameter of the far end of the fixing rod is small, and the end of the far end of the fixing rod is hemispherical.

The bottom surface of thighbone condyle prosthesis 1 is the sphere-like form, and can with the upper surface cooperation of shin pad 2, be equipped with a hinge rod 12 on the thighbone condyle prosthesis 1, hinge rod 12 with thighbone condyle prosthesis 1 is articulated, hinge rod 12 is installed the protruding 21 department at shin pad 2 middle part, hinge rod 12 with protruding 21 department has a through-hole that runs through, a fixed pin 22 will can be installed to through-hole department hinge rod 12 with protruding 21 is fixed.

The bottom edge of the tibia pad 2 is sunken and is provided with a chamfer, the edge of the upper surface of the tibia pad 3 is convex, the tibia pad 2 and the tibia pad 3 are connected and are fixed with a rear overlapping part by three through holes 24 which can insert matched screws and nuts, the center of the bottom of the tibia pad 2 is provided with a third fixing rod 23 which is similar to the second fixing rod 31 in shape and smaller than the second fixing rod 31 in size and just can be inserted into the second fixing rod 31.

The surface of one end of the tibial tray 3 close to the second fixing rod 31 is provided with three fixing screws 32, the three fixing screws 32 are arranged in an equilateral triangle, and two sides of the joint of the second fixing rod 31 and the tibial tray 3 are provided with reinforcing ribs 33.

Compared with the prior art, the utility model discloses beneficial effect as follows:

the utility model discloses utilize simple structure, make knee joint prosthesis the shin hold in the palm with the thighbone condyle prosthesis can be accurate and convenient install in shin bone and thighbone, the shin pad with special mounting means is stable to be difficult to take place the dislocation between the shin holds in the palm, has fine application prospect.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a second schematic view of the overall structure of the present invention;

FIG. 3 is an exploded view of the overall structure of the present invention;

FIG. 4 is a schematic view of the installation structure of the femoral condyle prosthesis and the tibial pad of the present invention;

FIG. 5 is a schematic view of the installation structure of the tibia pad and the tibia tray of the present invention;

FIG. 6 is a bottom view of the tibial tray of the present invention;

figure 7 shows the tibia pad and the tibia support of the utility model

In the figure: 1-femoral condyle prosthesis; 11-a first fixing bar; 12-a hinged lever; 2-a tibia pad; 21-bulge; 22-a fixation pin; 23-a third fixing bar; 24-a through hole; 3-a tibial tray; 31-a second fixing bar; 32-set screws; 33-reinforcing ribs; 34-screw.

Detailed Description

In order to clarify technical problems, technical solutions, implementation processes and performance displays, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only. The utility model discloses, be not used for limiting the utility model discloses. Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the subject matter of the present disclosure.

Example 1

As shown in fig. 1, a novel knee joint prosthesis is characterized by comprising a femoral condyle prosthesis 1, a tibial pad 2 and a tibial tray 3, wherein the femoral condyle prosthesis 1 and the tibial tray 3 are respectively connected with a first fixing rod 11 and a second fixing rod 31, and four cylindrical guide grooves are respectively formed on the first fixing rod 11 and the second fixing rod 31.

As shown in fig. 1 to 3, as a possible embodiment, the first fixing rod 11 and the second fixing rod 31 are in the shape of a truncated cone, one end near the femoral condyle prosthesis 1 or the tibial tray 3 has a larger diameter and a smaller distal end diameter, so that the first fixing rod 11 or the second fixing rod 31 can be conveniently installed in a deep hole drilled in advance, and the distal end is in a hemispherical shape, so that damage to human tissues and bones due to sharp edges is prevented as much as possible.

As shown in fig. 1-3, as a possible embodiment, the bottom surface of the femoral condyle prosthesis 1 is spherical-like and can be matched with the upper surface of the tibia pad 2, the femoral condyle prosthesis 1 is provided with a hinge rod 12, and the hinge rod 12 is hinged with the femoral condyle prosthesis 1, so that the femoral condyle prosthesis 1 can smoothly articulate with the tibia pad 2; the hinge rod 12 is installed in the protrusion 21 in the middle of the tibia pad 2, the hinge rod 12 and the protrusion 21 have a through hole, a fixing pin 22 can be installed at the through hole to fix the hinge rod 12 and the protrusion 21, so as to ensure that the position relation between the femur condyle prosthesis 1 and the tibia pad 2 cannot be changed during movement.

As shown in fig. 4 to fig. 7, as a possible embodiment, the bottom edge of the tibia pad 2 is concave and is provided with a chamfer to facilitate guiding and positioning when the tibia pad 2 and the tibia tray 3 are installed, the edge of the upper surface of the tibia tray 3 is convex, three through holes 24 are formed at the joint and rear overlapping part of the tibia pad 2 and the tibia tray 3 to insert and fix matching screws 34 through nuts, so as to ensure that the tibia pad 2 and the tibia tray 3 do not move relatively after installation, and a third fixing rod 23 which is similar to the second fixing rod 31 in shape and smaller than the second fixing rod 31 in size and can be just inserted into the second fixing rod 31 is arranged at the center of the bottom of the tibia pad 2.

As shown in fig. 5, as a possible embodiment, three fixing screws 32 are provided on one end surface of the tibial tray 3 near the second fixing portion 31, the three fixing screws 32 are arranged in an equilateral triangle to increase the stability of the tibial tray 3 after being installed on the tibia, and reinforcing ribs 32 are provided on both sides of the joint of the second fixing screw 31 and the tibial tray 3 to increase the stability of the tibial tray 3 after being installed in the tibia and also to play a role in guiding and positioning before.

The utility model discloses utilize simple structure, make knee joint prosthesis the shin holds in the palm with the installation that thighbone condyle prosthesis can be accurate and convenient is in shin bone and the thighbone, the shin pad with special mounting means is stable to be difficult to take place the dislocation between the shin holds in the palm, has fine application prospect.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a novel knee joint prosthesis, its characterized in that includes thighbone condyle prosthesis (1), shin bone pad (2) and shin bone support (3), wherein thighbone condyle prosthesis (1) with first dead lever (11) and second dead lever (31) are connected respectively to shin bone support (3), first dead lever (11) with four cylindrical guide ways are seted up respectively on second dead lever (31) pole.

2. The new knee joint prosthesis according to claim 1, characterized in that the femoral condyle prosthesis (1) is mounted on the bottom end of the femur and the tibial tray (3) is mounted on the tibia.

3. The new knee joint prosthesis according to claim 2, characterized in that said first fixation rod (11) and said second fixation rod (31) are both frustoconical, with a larger diameter at the end close to said femoral condylar prosthesis (1) or said tibial tray (3), a smaller diameter at the distal end and a hemispherical shape at the distal end.

4. The novel knee joint prosthesis according to claim 3 is characterized in that the bottom surface of the femoral condyle prosthesis (1) is spherical-like and can be matched with the upper surface of the tibia pad (2), the femoral condyle prosthesis (1) is provided with a hinge rod (12), the hinge rod (12) is hinged with the femoral condyle prosthesis (1), the hinge rod (12) is installed at a bulge (21) in the middle of the tibia pad (2), the hinge rod (12) and the bulge (21) are provided with a through hole, and a fixing pin (22) can be installed at the through hole to fix the hinge rod (12) and the bulge (21).

5. The novel knee joint prosthesis according to claim 4, wherein the bottom edge of the tibia pad (2) is concave and is provided with a chamfer, the edge of the upper surface of the tibia tray (3) is convex, three through holes (24) are formed at the joint and rear overlapping part of the tibia pad (2) and the tibia tray (3) for inserting a matched screw (34) and fixing the matched screw by a nut, a third fixing rod (23) which is similar to the second fixing rod (31) in shape and is smaller than the second fixing rod (31) in size and just capable of being inserted into the second fixing rod (31) is arranged at the right center of the bottom of the tibia pad (2).

6. The novel knee joint prosthesis according to claim 5, characterized in that three fixing screws (32) are provided on one end surface of the tibial tray (3) close to the second fixing rod (31), the three fixing screws (32) are arranged in an equilateral triangle, and reinforcing ribs (33) are provided on both sides of the joint of the second fixing rod (31) and the tibial tray (3).