Quadruped Knee Prosthesis Axle Rotation Mechanism
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Solution Overview
Problem
Current knee joint replacement designs for humans are inadequate for quadrupeds like canines and felines due to differing force distributions and anatomical requirements, leading to potential component dislocation and limited application in these species.
Innovation Solution
A total knee replacement prosthesis assembly featuring a femoral component, tibial component, and a bearing component with a transverse bore and post configuration, including a medial-lateral hinge axis and a rotating platform with predefined rotational laxity, to prevent dislocation and accommodate unique quadruped anatomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a post-in-channel design is used for rotating hinge knee mechanism, then internal and external rotation is enabled, but component dislocation occurs due to distraction
Solution Approach 1:
The bearing component is divided into separate sections with individual transverse bores, allowing independent control of rotational movements. The first bearing component handles internal-external rotation while the second bearing component manages anterior-posterior rotation, preventing dislocation by segmenting the rotational functions.
Solution Approach 2:
Axles are introduced as intermediary elements that connect the bearing components to the tibial and femoral components. These axles act as mediators that transmit rotational movements while maintaining stable connections, preventing direct dislocation between the bearing components and bone-anchored components.
2Stability of the object's composition
If a rotating hinge mechanism is used for severe soft tissue compromise, then stability is improved, but distraction leads to dislocation
Solution Approach 1:
The mechanism allows dynamic rotational movements through the two bearing components with different rotational axes. The first bearing component rotates about a mediolateral axis for internal-external rotation, while the second bearing component rotates about an anteroposterior axis for anterior-posterior rotation, providing adaptive stability that responds to soft tissue conditions without causing dislocation.
3Adaptability or versatility
If human knee replacement designs are used for quadrupeds, then limited application is achieved, but anatomical requirements are not met
Solution Approach 1:
The knee joint replacement prosthesis is designed with universal applicability for both quadruped and biped species. The dual-bearing component system with independent rotational capabilities provides multi-functional movement patterns that accommodate the anatomical requirements of different species, making the design versatile while maintaining reliable clinical function.
Data Source
Figure 1~2B
Figure 3A~4
Figure 5~6
AI summary
A total knee replacement prosthesis assembly (10) comprising a femoral component (20), a tibial component (30) having a tibial platform (32), and a bearing component (40), the bearing component having an inferior side (40b) and a superior side (40a), the bearing component being adapted to be arranged between the femoral component and tibial platform when assembled,the tibial platform having a post (36) upstanding from it and the bearing component having a post recess (46) in its inferior side for receiving the post, the bearing component being rotatable about the post when assembled, the post and bearing component each having a transverse bore and the assembly further comprising an axle (60), at least part of the axle being received through the transverse bore (38) in the post when assembled and at least part of the axle being received through the transverse bore (52) in the bearing component when assembled, the axle being configured to provide an axis of rotation between the femoral component and bearing component which is fixed relative to the femoral component and the bearing component in use.