Vibrotactile Feedback for a Person with Transradial Amputation and Visual Loss: A Case Report

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Medicine

Background:

• Major upper-limb amputation presents challenges in tactile sensation and hand function.
• Visual compensation for lost hand function can divert attention and is impossible with vision loss.
• Restoring tactile feedback is crucial for individuals with both amputation and visual impairment.

Observation:

• A prototype tactile feedback system was developed using a sensor glove and vibration actuators.
• The system was tested on a 30-year-old male with traumatic transradial amputation and complete vision loss.

Findings:

• Significant functional improvements were observed, including a 66% increase in the Box and Blocks test scores.
• The Southampton Hand Assessment Procedure score improved from 30% to 43% with tactile feedback.
• Qualitative benefits included enhanced bimanual activity, improved ergonomics, and reduced reliance on the unaffected limb.

Implications:

• Restoring peripheral sensitivity in prosthetic hands can improve utility and function, even without visual compensation.
• Tactile feedback may enhance prosthetic acceptance, embodiment, social integration, and pain management in individuals with impaired somatosensation and vision.
• This approach holds potential for individuals with combined visual and somatosensory deficits.