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Updated: May 25, 2026

Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

Published on: March 17, 2023

MEMS-based bubble pressure sensor for prosthetic socket interface pressure measurement.

Jason W Wheeler¹, Jeffrey G Dabling, Douglas Chinn

¹Sandia National Laboratories, Albuquerque, NM87185, USA. jwwheel@sandia.gov

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

This summary is machine-generated.

Researchers developed a novel bubble sensor for monitoring prosthetic socket pressure. This sensor shows excellent performance, offering valuable data for clinical and research applications in prosthetics.

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Area of Science:

Biomedical Engineering
Prosthetics and Orthotics
Sensor Technology

Background:

Chronic monitoring of pressure at the prosthetic socket/residual limb interface is crucial for research and clinical practice.
Existing monitoring technologies may have limitations in performance or applicability.
Understanding interface pressure is key to improving prosthetic fit and function.

Purpose of the Study:

To introduce and characterize a novel fluid-filled bubble sensor for prosthetic socket pressure monitoring.
To evaluate the performance of the novel sensor against existing commercial technologies.
To assess the sensor's suitability for long-term data collection in prosthetic applications.

Main Methods:

Development of a novel sensor comprising a MEMS pressure sensor and custom electronics within a fluid-filled bubble.
Characterization of the bubble sensor's performance, including drift and resolution.
Comparative analysis of the bubble sensor against two commercially available pressure sensing technologies.

Main Results:

The novel bubble sensor demonstrated excellent drift performance and good sensing resolution.
The sensor exhibited hysteresis, potentially attributable to the silicone molding material.
Performance metrics suggest potential for valuable data acquisition in prosthetic applications.

Conclusions:

The developed bubble sensor offers a promising new tool for chronic pressure monitoring in prosthetic sockets.
Hysteresis was observed, suggesting material or integration considerations for optimization.
Recommendations include positioning the sensor between the liner and socket to mitigate hysteresis for improved accuracy.