Multi-axis ankle joint prosthesis with adjustable spherical structure
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Solution Overview
Problem
Current ankle joint prosthetics are often bulky, lack personalized adaptability, and have poor movement coordination between affected and unaffected limbs due to fixed joint axis angles, making them uncomfortable and less suitable for various environments.
Innovation Solution
A multi-axis ankle joint prosthesis with an adjustable joint axis angle and spherical structure, allowing for customizable angle adjustments through sliding components, which reduces the overall size and improves bearing capacity, enabling better movement coordination and environmental adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional axis-based force bearing elements are used in ankle joint prostheses, then the structure is simple, but the shaft diameter becomes large resulting in bulky overall size
Solution Approach 1:
The patent replaces traditional linear axis-based force bearing elements with a spherical structure where force is distributed across a ball-and-socket joint mechanism. The spherical geometry allows force to be borne through radial loading on the ball surface rather than requiring a large diameter shaft, thereby reducing overall prosthesis size while maintaining structural simplicity through the intuitive spherical design.
2Stability of the object's composition
If fixed space angle of two axes is used in multi-axis ankle joint prosthesis, then the structure is stable, but personalized adaptability is low and movement coordination is poor
Solution Approach 1:
The patent incorporates adjustable angle mechanisms that allow the space angle between the two axes to be dynamically modified. The adjustment mechanism includes movable components with locking features that enable the angle to be changed while maintaining stability during use. This dynamic capability allows customization for different patients' anatomical variations and injury patterns, improving personalized adaptability without compromising structural stability during operation.
3Ease of manufacture
If fixed joint axis angle is used in ankle joint prosthesis, then manufacturing is simple, but adaptability to different road surfaces and movement coordination is poor
Solution Approach 1:
The patent divides the prosthesis into modular segments with independent adjustment capabilities. The adjustable angle mechanism is segmented into discrete components including adjustment elements, locking mechanisms, and movable joints that can be manufactured separately and assembled. This segmentation maintains manufacturing simplicity through standardized components while enabling post-manufacturing customization of the joint angle to adapt to different road surfaces and patient needs.
Data Source
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AI summary
Disclosed is a multi-axis ankle joint prosthesis with an adjustable joint axis angle and a spherical structure, belonging to the technical field of bionic human body prostheses. The present invention includes a foot connection part, a leg connection part, an upper part and a lower part, and rotation around an axis is replaced with sliding of a mechanism along a rail; and a space angle of a joint axis is adjusted by adjusting a position of each external component, thereby making the prosthesis of the present invention close to an ankle joint structure of a human body to the maximum extent. An adjustment process is carried out outside the product, making adjustment more convenient. As for the employment of the spherical structure, the prosthesis is closer to the human body in appearance, more stable in structure, and higher in bearing capacity.