Prosthetic Socket Interface With Compression Bars
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Solution Overview
Problem
Traditional prosthetic sockets fail to effectively prevent lost motion between the socket and the underlying skeletal structure, leading to instability and discomfort for amputees.
Innovation Solution
The development of a prosthetic socket design featuring deep channels and longitudinal relief areas, combined with the use of compression bars and a jig system for precise placement, allows for optimal tissue compression and stabilization, minimizing lost motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional encapsulating sockets are used to contain the limb part, then the socket structure is simple and easy to manufacture, but lost motion between the socket and underlying skeletal structure cannot be prevented
Solution Approach 1:
The socket is divided into multiple functional zones: encapsulating portions that contain the limb part and compression bar portions that apply localized compression forces. This segmentation allows each portion to perform its specific function - the encapsulating portions provide structural containment while the compression bar portions prevent lost motion through targeted compression, resolving the contradiction between simplicity and effectiveness.
Solution Approach 2:
Compression bars are positioned at specific locations within the socket to apply compression forces at precise anatomical points. This local quality approach means that compression is applied only where needed rather than uniformly throughout the socket, preventing lost motion at critical interfaces while maintaining overall socket simplicity and manufacturability.
2Reliability
If compression bars are added to prevent lost motion, then stability and comfort are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The compression bars are integrated into the socket as a unified structure rather than being separate components. The socket is formed as a single piece that incorporates both the encapsulating portions and the compression bar portions, eliminating the need for separate assembly steps and maintaining ease of manufacture while providing the stability and comfort benefits of compression bars.
3Reliability
If deep channels are formed in the positive model for compression bars, then tissue compression is optimized and lost motion is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The positive model is pre-formed with channels at the correct depth and position before the socket fabrication process begins. This preliminary action ensures that when the socket is created from the positive model, the compression bars will be positioned accurately without requiring high-precision machining during socket manufacturing. The channels are prepared in advance as part of the molding process, reducing the precision burden on subsequent manufacturing steps.
Data Source
AI summary
A method of manufacturing an interface for a body part is described. The method includes the step of selecting an inner radial dimension of the interface to have a plurality of compression areas that extend along the long axis of the interface. The method also includes the step of spacing the plurality of compression areas circumferentially around the long axis of the interface to create a compression pattern. The compression pattern is sized and dimensioned to reduce motion of the skeletal structure towards a wall of the interface when the interface is worn on the body part by compressing soft tissue of the body part against the skeletal structure.