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Mechanical performance of inflatable inserts used in limb prosthetics
1Department of Bioengineering, University of Washington, Seattle 98195, USA. jsanders@u.washington.edu
Journal of Rehabilitation Research and Development
|September 21, 2001
Summary
Inflatable inserts for residual limb shrinkage showed pressure loss over time and a two-phase pressure-thickness curve. The transition point suggests inserts may not provide consistent support without high inflation pressures.
Area of Science:
- Biomedical Engineering
- Prosthetics and Orthotics
Background:
- Residual limb shrinkage is a common challenge in prosthetic use.
- Inflatable inserts are designed to manage volume fluctuations and improve prosthetic fit.
Purpose of the Study:
- To evaluate the performance of inflatable inserts under compressive loading.
- To analyze pressure loss and pressure-thickness relationships in prosthetic inserts.
Main Methods:
- Bench testing of inflatable inserts under static and cyclic compressive loading.
- Measurement of pressure loss over time.
- Analysis of pressure versus thickness curves, identifying distinct phases.
Main Results:
- Inserts exhibited pressure loss ranging from 0.09%/min to 1.36%/min within the first 5 minutes.
- A two-phase pressure-thickness curve was observed, with a transition occurring beyond clinically acceptable thickness.
- Local stiffness was more influenced by insert pressure than by thickness constraints.
Conclusions:
- Inflatable inserts may not provide consistent support due to pressure loss and the nature of their pressure-thickness response.
- The current design may place more stress on the residual limb and socket than the insert itself.
- Adjusting the transition point in the pressure-thickness curve could improve insert performance.