Symmetrical Acetabular Cup Impaction Plate Design
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Solution Overview
Problem
Traditional prosthetic acetabular cups with single-plane rims do not accurately mimic the natural acetabulum's contoured shape, leading to improper positioning and potential tissue damage, and require side-specific impaction plates, increasing tooling complexity.
Innovation Solution
A symmetrical prosthetic acetabular cup impaction plate with intersecting annular arrays of shape portions that mirror the natural right and left acetabular rim shapes, allowing the same plate to support both right and left side cups by distributing impact loading evenly around the rim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional single-plane rim cups are used, then manufacturing is simpler, but positioning accuracy and tissue compatibility deteriorate
Solution Approach 1:
The cup rim is designed with a contoured shape featuring three convex portions that replicate the natural acetabular rim geometry, replacing the traditional single-plane flat rim. This curvature enables accurate positioning within the natural acetabulum while maintaining compatibility with surrounding soft tissues.
Solution Approach 2:
The rim geometry parameters are changed from a single-plane configuration to a multi-convex contoured shape with specific radial and axial dimensions. This parameter modification allows the cup to conform to the natural acetabular anatomy, improving positioning accuracy and reducing soft tissue conflict.
2Manufacturing precision
If side-specific impaction plates are used for right and left cups, then positioning accuracy improves, but device complexity and tooling requirements worsen
Solution Approach 1:
A single universal impaction plate design is developed that can accommodate both right and left contoured cups. The plate features a contoured upper surface with a cup-engaging wall that complements the contoured rim geometry, allowing it to work with either side's cup without requiring separate side-specific plates.
Solution Approach 2:
The impaction plate incorporates an asymmetric contoured upper surface that mirrors the natural acetabular rim shape. This asymmetric design enables the plate to adapt to both right and left cups, as the contoured geometry naturally conforms to whichever side is being operated on, eliminating the need for dedicated right and left plates.
3Manufacturing precision
If contoured rim cups mimicking natural acetabulum are used, then positioning accuracy and tissue compatibility improve, but impaction plate complexity worsens
Solution Approach 1:
The impaction plate features a contoured upper surface with a cup-engaging wall that has localized geometric features matching specific portions of the natural acetabular rim. This local quality matching allows the plate to conform to the contoured cup rim, enabling accurate impaction while maintaining a relatively simple overall plate structure.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A prosthetic acetabular cup impaction plate (1) comprising an annular cup engaging surface (2) comprising an annular array of first shape portions (3, 4, 5, 6) adapted to substantially complement portions of the natural shape of the right side acetabulum, which first shape portions are intersected by an annular array of second shape portions (3a, 4a, 5a, 6a) adapted to substantially complement the natural shape of the left side acetabulum.