Offset Connecting Device for Joint Prosthesis Adaptability
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Solution Overview
Problem
Conventional connecting devices for joint prostheses are not designed to accommodate individual musculoskeletal mechanics and biological diversity, leading to mismatch issues that can result in activity limitations, muscle stiffness, pain, and the need for re-replacement surgery.
Innovation Solution
A connecting device for joint prostheses that includes a stem, a receiving component, and an offset connecting mechanism with a first and second connecting component, where an inserting member adjusts the longitudinal central axis alignment to match the patient's musculoskeletal mechanics, allowing for customizable fit and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fixed connecting device is used, then the device structure is simple, but it cannot match individual musculoskeletal mechanics and causes mismatch issues
Solution Approach 1:
The connecting device is divided into multiple components: a stem means, a receiving means, and an offset connecting means with first and second connecting components. This segmentation allows each component to be independently positioned and adjusted, enabling customization for individual patient anatomy while maintaining a relatively simple overall structure.
Solution Approach 2:
The offset connecting means provides adjustable positioning between the stem means and receiving means, allowing the longitudinal central axis to be shifted to match individual patient anatomy. This dynamic adjustability enables the device to adapt to different musculoskeletal mechanics without requiring a completely complex custom-designed device for each patient.
2Adaptability or versatility
If an adjustable connecting device with offset means is used, then adaptability to patient anatomy is improved, but assembly complexity increases
Solution Approach 1:
The offset connecting means is divided into a first connecting component with an inserting bore and a second connecting component with an inserting recess. The inserting member passes through these segmented components to secure them together, allowing for adjustable positioning while maintaining straightforward assembly through a clear insert-and-secure process.
3Reliability
If a fixed connecting device is used, then manufacturing is simple, but it causes stress concentration and joint wear due to mismatch
Solution Approach 1:
The offset connecting means allows the longitudinal central axis to be shifted to match the patient's natural anatomy, preventing stress concentration and joint wear that result from mismatched fixed devices. This dynamic positioning capability is achieved through standard manufacturing techniques for the modular components, avoiding the need for complex custom manufacturing while improving reliability.
Data Source
AI summary
A connecting device of joint prosthesis includes a stem means provided for being inserted into a medullary cavity of a bone, a receiving means provided for receiving a bone structure near the bone, an offset connecting means connected between the stem means and the receiving means, and an inserting member. The offset connecting means includes a first connecting component and a second connecting component. The inserting member inserts into an inserting bore of the first connecting component and an inserting recess of the second connecting component to make the first connecting component being fixed and positioned at the second connecting component, wherein there is an offset distance between the longitudinal central axis of the first connecting component and the longitudinal central axis of the second connecting component. Thereby the connecting device of joint prosthesis is adjustable for fitting individual patients with more effect in regard of the musculoskeletal mechanics.