Knee Joint Prosthesis Curved Outer Surface Stability
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Solution Overview
Problem
Conventional knee replacement surgeries face challenges in providing a stable and durable artificial knee joint surface that effectively addresses the wear and tear caused by osteoarthritis, leading to limited range of motion and pain, especially in maintaining the natural movement and weight-bearing capabilities of the knee joint.
Innovation Solution
A medical device with a curved outer surface and a hollow inner surface, featuring a unique configuration of points and a circular extension to fill circumferential discontinuities, is designed to clasp the distal portion of the femoral bone, incorporating a through-going fixation element and adjustable arrangements for secure attachment, allowing for variable positioning and stability, and includes articulating surfaces to replace the medial and lateral condyles and patella, ensuring a stable fit and weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional prosthesis is placed on the condyles, then the knee joint can be replaced, but the stability and natural movement capability are compromised
Solution Approach 1:
The prosthesis features a curved outer surface that follows the natural curvature of the distal femur, creating a form-fitting interface that enhances stability while preserving natural knee movement patterns. The curved geometry allows the device to conform to the bone's contour, providing secure attachment without restricting physiological motion.
Solution Approach 2:
The prosthesis employs different surface characteristics at different locations: a curved outer surface for bone contact, a hollow inner surface for structural integrity, and an imaginary circular extension for filling circumferential discontinuities. This localized differentiation optimizes both stability and adaptability in specific functional zones.
2Reliability
If the prosthesis is designed to clasp the distal portion of the femoral bone, then stability is improved, but the device complexity increases
Solution Approach 1:
The prosthesis is divided into distinct functional surfaces: an outer curved surface for bone contact, a hollow inner surface for structural support, and an imaginary circular extension for geometric completion. This segmentation allows each component to perform its specific function while maintaining overall simplicity.
Solution Approach 2:
Multiple geometric elements (curved surface, hollow interior, circular extension) are merged into a single integrated prosthesis structure that clasps the distal femur. This consolidation achieves stable attachment without requiring multiple separate components, thereby reducing overall device complexity.
3Adaptability or versatility
If the prosthesis uses a hollow inner surface with circular extension, then the fit is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The hollow inner surface and imaginary circular extension create a geometrically simple yet highly adaptable form that conforms to the distal femur. This curved geometry provides excellent fit while remaining straightforward to manufacture using conventional techniques, avoiding complex precision requirements.
4Reliability
If the prosthesis replaces the contacting surfaces of condyles and patella, then the wear and tear is reduced, but the loss of natural cartilage function occurs
Solution Approach 1:
The prosthesis changes the physical parameters of the joint surface by replacing organic cartilage with a durable artificial material. This substitution eliminates wear and tear while maintaining the essential mechanical functions of the natural joint, including load-bearing and motion facilitation.
Data Source
AI summary
A medical device for implantation in a knee joint of a human patient is provided. The medical device comprises: an inner surface and an outer surface. The inner surface comprises: a first point, a second point, a third point, a fourth point, a fifth point, and a sixth point, all points located on different places along a length axis of said inner surface. A first straight line, reaching from the first point to the second point is parallel to a second straight line reaching from the third point to the fourth point, which in turn is parallel to a third straight line reaching from the fifth point to the sixth point. The first and third straight lines are of equal length and the second straight line is longer than the first, furthermore the third straight line is positioned between the first and third straight lines. Wherein the medical device comprises a first articulating surface adapted replaced the surface of the contacting surface of the medial condyle, a second articulating surface adapted to replace the contacting surface of the lateral condyle and a third articulating surface adapted to replace the contacting surface of the patella.