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Related Experiment Videos

A modular six-directional force sensor for prosthetic assessment: a technical note

J E Sanders1, R A Miller, D N Berglund

  • 1Center for Bioengineering and Department of Mechanical Engineering, University of Washington, Seattle 98195, USA. sanders@limbs.bioeng.washington.edu

Journal of Rehabilitation Research and Development
|April 1, 1997
PubMed
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A novel, thin, and lightweight prosthetic device accurately measures forces and moments during walking for individuals with lower limb amputation. This advancement enhances prosthetic function assessment.

Area of Science:

  • Biomechanics
  • Biomedical Engineering
  • Rehabilitation Engineering

Background:

  • Accurate measurement of forces and moments in lower limb prostheses is crucial for understanding gait and improving prosthetic design.
  • Existing force measurement devices are often bulky or limited in their measurement capabilities.
  • Lower limb amputation presents unique biomechanical challenges that necessitate advanced monitoring tools.

Purpose of the Study:

  • To present a novel, thin, and lightweight device for measuring six components of force and moment transmitted through lower limb prostheses.
  • To evaluate the accuracy and performance of this new sensing unit in a bench-test setting and during subject trials.
  • To provide data on prosthetic force transmission during walking in individuals with transtibial amputation.

Main Methods:

Related Experiment Videos

  • Development of a disk-shaped transducer incorporating twelve strain gages configured into Wheatstone bridge circuits.
  • Calibration of the sensor using a 6x6 matrix to correlate bridge output with force and moment components.
  • Bench-testing under simulated walking loads and data collection from a subject with transtibial amputation (TTA).

Main Results:

  • The developed sensing unit is significantly thin (19 mm) and lightweight (527.5 g).
  • Bench-test evaluations demonstrated errors less than 7.2% of full-scale output for all measured force and moment components.
  • Data successfully captured prosthetic forces and moments during TTA subject's walking at various speeds.

Conclusions:

  • The novel prosthetic sensing device offers a compact and accurate solution for measuring in-situ forces and moments.
  • This technology has the potential to significantly advance the assessment and optimization of lower limb prosthetics.
  • Further research can utilize this device to gain deeper insights into gait biomechanics and prosthetic user outcomes.