Individual Prosthetic Finger Control Via Ultrasonic Sensor Developed at
  Georgia Tech
From: Rehab Management - 12/14/2017

An ultrasonic sensor designed to allow amputees to control each individual
finger in their prosthetic hand has helped an amputee - a musician - play the
piano for the first time since his injury, note researchers from Georgia
Institute of Technology.

Jason Barnes, a musician, lost his hand and most of his forearm 5 years ago
due to a work accident. The muscles in his residual limb work with the sensor
to control his fingers. The sensor is able to provide fine motor hand
gestures that aren't possible with current commercially available devices,
the researchers suggest, in a media release from Georgia Institute of
Technology.

Read the entire article at:
http://www.rehabpub.com/2017/12/individual-prosthetic-finger-control-via-ultrasonic-sensor-developed-georgia-tech

Links:
Ultrasonic Sensor Allows Amputees to Control Prosthetic Fingers
https://www.medicaldesignbriefs.com/component/content/article/1104-mdb/features/28202

The Force is Strong: Amputee Controls Individual Prosthetic Fingers (with
  videos 1:45, 0:23, 2:39)
http://www.news.gatech.edu/2017/12/11/force-strong-amputee-controls-individual-prosthetic-fingers

Robotic Prosthesis Turns Drummer into a Three-Armed Cyborg (with video 1:09)
http://www.news.gatech.edu/2014/03/05/robotic-prosthesis-turns-drummer-three-armed-cyborg

'Skywalker' Prosthetic Hand Uses Ultrasound for Finger-Level Control
https://spectrum.ieee.org/the-human-os/biomedical/devices/skywalker-prosthetic-hand-uses-ultrasound-sensors-for-fingerlevel-control