Acute-Angle Snap Pad Prosthesis for Secure Knee Implant Connection
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Solution Overview
Problem
In unicompartmental knee arthroplasty, the integration of a tibial plateau and pad prosthesis poses challenges due to the narrow field of vision and operation space, making it difficult to clean posterior bone cement and achieve a strong, secure connection between the tibial plateau and pad, which are essential for effective surgery and recovery.
Innovation Solution
A pad prosthesis design featuring a body with a protrusion portion and snap mechanism, where the snap extends at an acute angle, providing a larger engaging force and stability by fitting into specific slots on the tibial tray plateau, ensuring a secure and easy-to-maintain connection during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the tibial plateau and pad are integrated, then the structure is simplified and easier to manufacture, but the posterior bone cement cannot be cleaned after mounting
Solution Approach 1:
The invention divides the integrated structure into separate components: the tibial plateau and the pad prosthesis. The pad is designed as an independent component that can be mounted separately, allowing surgeons to access and clean the posterior bone cement between the tibial plateau and the pad, thus resolving the cleaning difficulty while maintaining structural simplicity.
2Ease of operation
If the pad and tibial plateau are mounted separately, then the posterior bone cement can be cleaned, but the connection between pad and tibial plateau becomes weaker and more prone to separation
Solution Approach 1:
The pad prosthesis features a recessed portion that receives and nests the protrusion portion of the tibial plateau. This nested configuration creates a secure mechanical interlock that strengthens the connection between the separately mounted components, preventing separation while allowing posterior bone cement access.
3Reliability
If a strong engaging method is used to connect pad and tibial plateau, then the connection reliability is improved, but the device complexity increases
Solution Approach 1:
The invention combines multiple functions into simple geometric features: the protrusion portion serves as both the mounting interface and the engaging mechanism, while the recessed portion provides both structural integration and mechanical interlocking. This merging of functions achieves strong connection reliability without adding complex engaging mechanisms.
4Force
If the snap extends perpendicular to the front edge, then the engaging force is maximized, but the snap occupies excessive space and interferes with other components
Solution Approach 1:
The snap is oriented at an acute angle relative to the front edge of the pad, transitioning from a perpendicular arrangement to an angled configuration. This dimensional reorientation reduces the space occupied by the snap in the anterior-posterior direction while maintaining effective engaging force through the angled mechanical advantage.
Data Source
AI summary
A pad prosthesis includes a body, a protrusion portion and a snap. The body has a first surface, and the first surface includes a front edge, a curved edge, a rear edge and a straight edge connected sequentially. The protrusion portion is arranged on the first surface of the body. The snap is arranged on the first surface of the body, and the snap extends along a second direction, an angle between the second direction and the first direction is an acute angle. The pad prosthesis according to the present application may be applied in an artificial knee prosthesis.