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Artificial knee joint

A technology for artificial knee joints and articular surfaces, applied in the field of artificial knee joints, can solve problems such as wear and tear, and achieve the effect of avoiding bony contact

Inactive Publication Date: 2008-07-16
SAGA UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if it is used for a relatively short period of time, the part of the surface of the spine that contacts the cam is abnormally worn, and as a result, there is a problem that reoperation for artificial knee replacement is inevitable.

Method used

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  • Artificial knee joint
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  • Artificial knee joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0051] As shown in Figures 1 to 5, the artificial knee joint 1 of the present invention includes: a femur part 2, which is fixed at the distal part of the femur; and a tibial part 3, which is fixed at the proximal part of the tibia.

[0052] The femoral part 2 includes: two femoral articular surfaces 25 that are curved and bulged; and an ellipsoidal or substantially cylindrical cam part 21 .

[0053] The tibial part 3 includes: a tibial tray 31 fixed on the proximal part of the tibia; and an insertion tray 4 fixed on the upper surface of the tibial tray 31 .

[0054] The insertion tray includes two tibial articular surfaces 45 abutting on the two femoral articular surfaces 25 , and a cam sliding surface 41 abutting on the cam portion 21 , and slidingly moves in direct contact with the femoral portion 2 .

[0055] The artificial knee joint 1 according to the present embodiment is in the first sliding movement state when the knee is extended, and the femoral articular surface 25...

Embodiment approach 2

[0079] In the present embodiment, similar to Embodiment 1, it is an artificial knee joint including the femoral part 2 and the tibial part 3, but is characterized in that the cam part 21 is slidably fixed to the rear end part 23 of the femoral part 2. , by changing the protrusion amount of the cam portion 21 from the femoral articular surface 25, the offset amount can be adjusted.

[0080] As shown in FIG. 10 , a cam hole 26 is formed in the rear end portion 23 of the femoral portion 2 , and the cam portion 21 is fixed by inserting the cam shaft portion 24 into the cam hole 26 . The camshaft portion 24 and the cam hole 26 are securely fixed by forming an engaging mechanism on the surface of the camshaft portion 24 and the inner surface of the cam hole 26 , or by using an engaging member separate therefrom. In addition, by releasing the fixed state of the camshaft portion 24, the position in the cam hole 26 can be changed, for example, the camshaft portion 24 can be moved to th...

Embodiment approach 3

[0084] The present embodiment is the artificial knee joint 1 including the femoral part 2 and the tibial part 3 as in the first embodiment, but is characterized in that the insertion disc 4 is provided on the back side of the central position corresponding to the cam sliding movement surface. The downwardly sloping protrusion, the tibial tray has a recess that receives the downwardly sloping protrusion.

[0085] In the artificial knee joint 1 of the present invention, the knee can be bent in two sliding movement states, the first sliding movement state and the second sliding movement state, and the insertion disk 4 is worn due to repetition of these sliding movements. Therefore, it is necessary to set the thickness of the insertion tray 4 so that the lower side of the tibial articular surface 45 and the cam sliding movement surface 41 becomes equal to or greater than a predetermined thickness t in consideration of wear.

[0086] Fig. 12(B) shows the artificial knee joint 1 for...

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Abstract

An object of the present invention is to provide an artificial knee joint that can avoid both bony contact and soft tissue contact and is durable for long-term use. The artificial knee joint of the present invention includes a femur, a tibial tray, and an insertion plate fixed to the tibial tray. The femur portion includes: a femoral articular surface, and a cam portion protruding from the femoral articular surface provided at the rear end of the femoral articular surface, and the insertion plate includes: a tibial articular surface that abuts on the femoral articular surface, and A cam sliding movement surface that abuts on the cam portion. When the knee is extended, it is the first sliding state where the articular surface of the femur slides on the articular surface of the tibia, within the bending angle of 90° to 160°, from the first sliding state to the sliding movement of the cam part on the cam sliding surface The second sliding movement state shifts. When the knee is bent at a bending angle of 180°, the osteotomy surface of the femur and the rear end of the insertion plate are offset through the second sliding movement state.

Description

technical field [0001] The present invention relates to an artificial knee joint used for restoring normal function to the joint of a highly deformed knee due to osteoarthritis or chronic joint rheumatism. Background technique [0002] The artificial knee joint includes: a femur part fixed to the distal part of the femur, and a tibia part fixed to the proximal part of the tibia. As an example of an artificial knee joint, it is known that a spherical or ellipsoidal convex sliding surface is formed on the rear central sliding part of the femur, and a spherical or ellipsoidal convex sliding surface is formed on the rear central sliding part of the tibia. The artificial knee joint of the recessed part (for example, patent document 1). The convex sliding surface and the concave sliding surface fit together when the knee is bent, and slide and rotate behind, thereby increasing the movable range. Furthermore, by setting the height T of the convex sliding movement surface 1 and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/38
CPCA61F2/3886A61F2002/30604A61F2002/30616
Inventor 佛渊孝夫高野恭寿
Owner SAGA UNIVERSITY
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