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Flexible knee joint prosthesis

A knee joint prosthesis, flexible technology, applied in the direction of knee joint, prosthesis, elbow joint, etc., can solve the problems of reduced contact area, high pressure, accelerated wear of joint surface, etc., to prolong service life, reduce pain, and reduce surgery effect of times

Inactive Publication Date: 2016-08-03
BEIJING AKEC MEDICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But when the knee joint starts to flex, the contact area between the upper and lower surfaces will decrease sharply, and even theoretically there is only one contact line left in some positions. At this time, the local pressure will be very high, which is also a factor that leads to accelerated wear of the articular surface. important reason

Method used

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  • Flexible knee joint prosthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 , figure 2 Shown is an embodiment of the present invention, the flexible knee joint prosthesis in this embodiment, comprises femoral condyle prosthesis 1 and tibial platform 3, is provided with flexible spacer 2 between femoral condyle prosthesis 1 and tibial platform 3, The flexible spacer 2 is fixed on the tibial plateau 3, and the flexible spacer 2 supports the femoral condyle prosthesis 1. With the rotation of the femoral condyle prosthesis 1, the flexible spacer 2 produces adaptive deformation and maintains contact with the femoral condyle prosthesis 1 The parts are in surface contact.

[0032] The flexible gasket 2 is a hollow body, and the inner cavity is filled with a filling liquid 4 .

[0033] The flexible gasket 2 is made of ultra-high molecular weight polyethylene, and the filling liquid 4 is made of physiological saline or purified water, so that even if leakage occurs, it will not cause damage to human health.

[0034] The flexible gas...

Embodiment 2

[0038] Such as image 3 , Figure 4 Shown is Embodiment 2 of the present invention. In this embodiment, the flexible gasket 2 is provided with a fiber reinforced layer 2-1. By providing the fiber reinforced layer 2-1, the strength of the flexible gasket 2 is improved, and the cavity is effectively prevented from being crushed and broken.

[0039] Such as Figure 5 Shown is the manufacturing process of the flexible gasket 2, which is specifically manufactured by molding. The UHMWPE joint surface gasket is made into a cover and a hollow shell, and two small holes are reserved on the cover for remarking. liquid and expel trapped gas. The cover and the shell are bonded together with an adhesive or the two parts are firmly connected by ultrasonic welding to form a closed internal cavity, and a syringe is used to inject liquid such as physiological saline or purified water through a small hole, and the inner cavity The remaining gas in the cavity will be discharged from the othe...

Embodiment 3

[0041] Such as Figure 8 Shown is Embodiment 3 of the present invention. In this embodiment, the flexible pad 2 has a skirt 2-5, and the skirt 2-5 is provided with connection holes, and then the flexible pad 2 is fixed on the tibial plateau by screws 5 3, correspondingly, threaded holes can be set on the tibial plateau 3.

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Abstract

The invention discloses a flexible knee joint prosthesis. The flexible knee joint prosthesis comprises a femoral condyle prosthesis and a tibial plateau, wherein a flexible gasket is arranged between the femoral condyle prosthesis and the tibial plateau and fixed to the tibial plateau, and the flexible gasket supports the femoral condyle prosthesis and deforms adaptively along with the rotation of the femoral condyle prosthesis to maintain surface contact with the femoral condyle prosthesis. Due to the fact that the flexible gasket is prepared from ultrahigh molecular weight polyethylene, the articular surface can deform to adapt to and conform to the flexion and rotation deformation of the femoral condyle prosthesis under pressure, and then abrasion of the tibial plateau is relieved remarkably.

Description

technical field [0001] The invention relates to a flexible knee joint prosthesis, in particular to a flexible spacer applied between the femoral condyle prosthesis and the tibial plateau at the human knee joint. Background technique [0002] The knee joint prosthesis used in artificial knee replacement surgery usually uses medical metal to make the femoral condyle prosthesis on the femoral side, such as stainless steel or cobalt alloy, and the tibial side uses ultra-high molecular weight polyethylene to make spacers (tibial plateau) ; Due to the needs of knee joint kinematics, the metal articular surface of the femoral condyle prosthesis is generally designed as a complex continuous space surface, but the UHMWPE articular spacer on the tibial side can only be designed according to a specific position. (For example, in the upright position), there is a curved surface with a high degree of coincidence with the articular surface of the femoral side to ensure the stability whe...

Claims

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Application Information

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IPC IPC(8): A61F2/38
CPCA61F2/3836A61F2/3859A61F2/3877A61F2/389A61F2002/3006A61F2002/30448A61F2002/30451
Inventor 张卫平
Owner BEIJING AKEC MEDICAL
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