Acetabular Cup Liner Insertion Device Alignment
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Solution Overview
Problem
Existing devices for inserting liners into acetabular cups often result in misalignment, leading to restricted movement, component loosening, and potential damage, due to tilting issues during the insertion process.
Innovation Solution
A device comprising a first portion for initial alignment and a second portion with a guide arrangement to prevent tilting, allowing linear movement along an axis for precise insertion, ensuring the liner is correctly aligned and seated within the cup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If devices mounted on the liner are used for initial alignment, then alignment capability is improved, but tilting occurs during insertion leading to misalignment
Solution Approach 1:
The device is divided into three functional segments: a cup engagement portion with arms that engage the cup rim, a liner engagement portion with fingers that grip the liner, and a guide portion with laterally extending elements that engage the liner rim. This segmentation allows each portion to perform its specific function independently, preventing tilting while maintaining alignment precision during insertion.
Solution Approach 2:
The guide portion acts as an intermediary between the cup engagement portion and the liner engagement portion. Its laterally extending elements engage the liner rim to prevent tilting, mediating the transfer of alignment from the cup to the liner while ensuring stable insertion without direct contact between the cup engagement arms and the liner.
2Device complexity
If manual alignment methods are used, then device complexity is reduced, but alignment precision deteriorates
Solution Approach 1:
The device performs self-alignment through its structural design. The arms engage the cup rim to establish initial alignment, the fingers grip the liner, and the guide portion's laterally extending elements automatically engage the liner rim to prevent tilting during insertion. This self-aligning mechanism eliminates the need for complex external alignment tools or manual adjustment procedures while ensuring precise alignment.
3Ease of operation
If tilting is allowed during insertion, then ease of operation is improved, but manufacturing precision of the final assembly deteriorates
Solution Approach 1:
The device incorporates dynamic elements that adapt during insertion. The fingers gripping the liner and the laterally extending elements of the guide portion can adjust to accommodate slight variations in liner positioning, allowing easy insertion while maintaining alignment. The structure transitions from a rigid alignment framework to a slightly compliant insertion mechanism, ensuring precision is maintained throughout the dynamic insertion process.
Data Source
AI summary
A device and method for inserting a liner into an acetabular cup. The device includes a first portion configured to engage the liner and a rim of the acetabular cup to align a pole of the liner and a pole of the cup along an axis of the device prior to insertion of the liner into the cup. The device also includes a second portion for pushing the liner into the cup. The second portion includes a guide arrangement for engaging a rim of the liner. The second portion is coupled to the first portion for movement of the second portion with respect to the first portion along said axis.