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Wireless wearable controller for upper-limb neuroprosthesis.

Christa A Wheeler¹, P Hunter Peckham

¹Department of Biomedical Engineering, Case Western Reserve University, Wickenden Building, 10900 Euclid Ave, Cleveland, OH 44106, USA. caw30@case.edu

Journal of Rehabilitation Research and Development

|June 18, 2009

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This study developed a wireless wrist controller for neuroprosthetics, enabling proportional control via wrist position. This wearable device offers a feasible solution for individuals with tetraplegia to regain hand function.

Area of Science:

Biomedical Engineering
Neuroprosthetics
Wearable Technology

Background:

Implanted neuroprostheses utilize functional electrical stimulation for hand grasp in individuals with tetraplegia.
Wrist position control offers advantages by augmenting the tenodesis grasp and allowing bilateral implementation.
Recent advancements include fully implantable, battery-powered multichannel stimulators with wireless telemetry.

Purpose of the Study:

To develop a wireless, wearable joint angle transducer for proportional control of upper-limb neuroprostheses.
To enable control of implantable stimulators using wrist position for individuals with cervical-level spinal cord injury.

Main Methods:

Designed an external wrist controller utilizing gigantic magnetoresistive sensing techniques.

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Integrated a small magnet on the back of the hand for position measurement.

Developed a forearm-worn device for command signal acquisition.

Main Results:

Demonstrated the feasibility of the wireless wrist controller for neuroprosthetic control.
The device successfully measured wrist position using magnetoresistive sensing.
The controller design is amenable to miniaturization for improved cosmesis and ease of use.

Conclusions:

The wireless, wearable joint angle transducer is a viable control method for upper-limb neuroprostheses.
Wrist position offers an intuitive and effective control strategy for individuals with spinal cord injuries.
Future iterations can be reduced to a compact, wristwatch-like form factor.