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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

477
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
477

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Related Experiment Video

Updated: Oct 12, 2025

A Tactile Automated Passive-Finger Stimulator TAPS
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Micromachined Tactile Sensor Array for RTSA.

Elliott C Leinauer1, H Mike Kim2, Jae W Kwon1

  • 1Department of Electrical Engineering and Computer Science, University of Missouri, Columbia, MO 65201, USA.

Micromachines
|November 27, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel polymer tactile capacitive sensor for measuring joint reaction forces during reverse total shoulder arthroplasty (RTSA). The sensor accurately quantifies glenohumeral contact forces, aiding in surgical precision and reducing complications.

Keywords:
capacitive sensorglenohumeral joint forcepolydimethylsiloxane (PDMS)pressure sensorreverse total shoulder arthroplasty (RTSA)

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Orthopedic Surgery

Background:

  • Reverse total shoulder arthroplasty (RTSA) requires precise soft tissue tensioning for optimal outcomes.
  • Accurate measurement of glenohumeral joint forces is crucial during RTSA procedures.
  • Existing methods for assessing joint forces during RTSA have limitations.

Purpose of the Study:

  • To develop and validate a polymer-based tactile capacitive sensor for quantifying joint reaction forces in RTSA.
  • To enable real-time measurement of four components of glenohumeral contact forces.
  • To assist surgeons in achieving optimal soft tissue tensioning and implant fit.

Main Methods:

  • Fabrication of a polydimethylsiloxane (PDMS) dielectric layer with an electrode array using soft lithography.
  • Integration of the capacitive sensor within a 3D-printed replica of an RTSA prosthesis.
  • Testing the sensor's performance under static loading conditions in simulated shoulder positions.

Main Results:

  • The sensor demonstrated a loading time of approximately 400 ms at 14.13 kPa.
  • Achieved a sensitivity of 1.24 × 10-3 pF/kPa at a load of 1649 kPa.
  • Provided graphical pressure distribution across the glenohumeral joint, enabling intuitive analysis.

Conclusions:

  • The developed sensor can accurately measure joint reaction forces during RTSA.
  • This technology can aid in selecting appropriate implant sizes and offsets for patient anatomy.
  • Potential to reduce postoperative complications like dislocation and scapular stress fractures.