Faculty Advisor

Ault, Holly Keyes

Faculty Advisor

Hoffman, Allen H.


Persons with reduced hand strength and dexterity have difficulty completing activities of daily living. The project goal was to create an affordable hand orthosis for persons with reduced grip strength suitable for home use. The orthosis is wrist-activated and enables the user to form the cylindrical power grip and pincer precision grip. As the wrist flexes, pre-tensioned cables cause rigid finger channels to rotate and pull the fingers towards a fist. The device was manufactured mainly of plastic to keep weight (220g) and cost ($130) low. It provides a 13N grip force at a 45° wrist angle and the user can hold objects ranging in diameter from 7.5 to 45mm for the pincer grip and 30 to 80mm for the power grip. Testing indicates that the orthosis can assist users in performing daily tasks.


Worcester Polytechnic Institute

Date Accepted

March 2017


Mechanical Engineering

Project Type

Major Qualifying Project



Advisor Department

Mechanical Engineering