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Mobile interface for neuroprosthesis control aiming tetraplegic users.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2017
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STIMGRASP: A Home-Based Functional Electrical Stimulator for Grasp Restoration in Daily Activities.

Renato G Barelli1, Valter F Avelino1, Maria Claudia F Castro1

  • 1Electrical Engineering Department, Centro Universitário FEI, São Bernardo do Campo 09850-901, SP, Brazil.

Sensors (Basel, Switzerland)
|January 8, 2023
PubMed
Summary

Functional electrical stimulation (FES) can restore grasping for individuals with spinal cord injury (SCI) or stroke. The STIMGRASP device offers a portable, home-based FES solution for improved daily activity.

Keywords:
circuit applicationcircuit designfunctional electrical stimulation (FES)graspinghemiplegiatetraplegia

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Neuroscience

Background:

  • Spinal cord injury (SCI) and stroke frequently result in motor limitations, impacting daily life.
  • Functional electrical stimulation (FES) presents a promising avenue for restoring lost motor functions, such as grasping.
  • Assistive technologies are crucial for enhancing independence in individuals with neurological impairments.

Purpose of the Study:

  • To introduce the STIMGRASP, a novel home-based functional electrical stimulator.
  • To provide an assistive technology for individuals with tetraplegia or hemiplegia to regain grasping capabilities.
  • To develop a portable, user-friendly system for FES-assisted grasping.

Main Methods:

  • Development of a microcontrolled stimulator (STIMGRASP) with eight independent output channels.
  • Implementation of USB and Bluetooth communication for system control via a mobile app.
  • Design of a wearable orthosis with electrodes for muscle activation and four grasp modes.
  • Specification of pulse parameters: 20 Hz frequency, 300 µs/phase width, 40 mA amplitude.
  • Integration of a rechargeable 3100 mAh lithium-ion battery for over 10 hours of continuous use.

Main Results:

  • The STIMGRASP system is designed for portability, usability, and wearability.
  • It enables users to perform muscle activation sequences for four distinct grasp modes.
  • The device offers user-friendly control through a dedicated mobile application.
  • The system provides extended operational time exceeding 10 hours on a single charge.

Conclusions:

  • The STIMGRASP system represents a significant advancement in home-based assistive technology for individuals with SCI and stroke.
  • It facilitates the artificial restoration of grasping, thereby improving functional independence in daily activities.
  • The focus on portability and user-friendly control enhances the potential for widespread adoption and long-term use.