Prosthetic Socket Tether Adjustment Mechanism
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Solution Overview
Problem
Prosthesis users with limb amputation face challenges in managing residual limb volume loss, particularly due to the fault intolerance of elevated vacuum systems and the difficulty of partial doffing in active environments, which affects socket fit and fluid volume retention.
Innovation Solution
A motor-driven device within the prosthetic socket that adjusts the locking pin tether length using a coupling mechanism, allowing easy partial and full doffing with recorded adjustments for user convenience and fluid volume recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional prosthetic socks are added to reduce socket size, then socket fit is improved, but limb fluid volume is further reduced and limb atrophy is accentuated
Solution Approach 1:
The patent employs a dynamic adjustment mechanism that allows the socket suspension system to be adjusted between fully suspended and partially doffed states. This dynamic system enables the user to modify the degree of socket engagement based on limb volume changes, thereby maintaining proper socket fit without continuously adding prosthetic socks that would further reduce limb fluid volume and accelerate atrophy.
2Shape
If elevated vacuum systems are used to manage limb volume, then socket fit and suspension are improved, but fault intolerance to air leaks and maintenance requirements increase
Solution Approach 1:
The patent describes a passive mechanical adjustment system that does not require external power sources, pumps, or complex electronic controls. The system relies on simple mechanical components including a spool, tether, and adjustment mechanism that can be manually operated without technical expertise. This self-service approach eliminates the reliability issues associated with elevated vacuum systems while maintaining effective socket fit and suspension.
3Shape
If pin lock suspension is used for transtibial prosthesis, then socket fit is improved, but partial doffing becomes challenging in active environments
Solution Approach 1:
The patent implements a segmented adjustment mechanism that allows independent control of the suspension pin position relative to the socket. The system divides the adjustment function into discrete steps through a ratchet mechanism, enabling users to easily transition between fully suspended and partially doffed states without removing clothing or performing complex maneuvers. This segmentation makes partial doffing simple and quick for active users in various environments.
Data Source
AI summary
The present disclosure provides a device configured to be positioned within a prosthetic socket. The device includes a tether having a first end and a second end opposite the first end. The first end of the tether is configured to be coupled to a prosthetic liner. The device also includes a spool fixed with respect to the prosthetic socket. The second end of the tether is coupled to the spool. The device also includes a motor and a battery configured to provide power to the motor. The device also includes a coupling mechanism configured to transition from a first position in which the spool is only able to rotate in a first direction to a second position in which the spool is able to rotate in the first direction and a second direction. The device also includes a release actuator positioned on an exterior of the prosthetic socket. Actuation of the release actuator causes the coupling mechanism to transition from the first position to the second position. The device also includes a tightening actuator positioned on the exterior of the prosthetic socket. Actuation of the tightening actuator causes the motor to rotate the spool in the first direction to wind the tether around the spool to thereby reduce a distance between the first end of the tether and the spool.