Experimental analysis of an innovative prosthetic hand with proprioceptive sensors

TLDR

The natural hand performs grasping, manipulation, and exploration. The study aims to develop and fabricate an underactuated prosthetic hand with proprioceptive and exteroceptive sensors to restore these functions in upper‑limb amputees, and to experimentally characterize its mechanical structure and actuator system. The hand was designed using a biomimetic, underactuated architecture that integrates an artificial musculoskeletal system, proprioceptive and exteroceptive sensors, a control unit, and a human/machine interface, and was fabricated with robotic and microengineering techniques. The first prototype of the prosthetic hand was successfully designed and fabricated.

Abstract

This paper presents an underactuated artificial hand intended for functional replacement of the natural hand in upper limb amputees. The natural hand has three basic functionalities: grasping, manipulation and exploration. To accomplish the goal of restoring these capabilities by implanting an artificial hand, two fundamental steps are necessary: to develop an artificial hand equipped with artificial proprioceptive and exteroceptive sensors and to fabricate an appropriate interface able to exchange sensory-motor signals with the amputee's body and the central nervous system. In order to address these objectives, we have studied an underactuated hand according to a biomimetic approach, and we have exploited robotic and microengineering technologies to design and fabricate its building blocks. The architecture of the hand comprises the following modules: an actuator system embedded in the underactuated mechanical structure (artificial musculoskeletal system), a proprioceptive sensory system (position and force sensors), an exteroceptive sensory system (3D force sensors distributed on the cosmetic glove), an embedded control unit, and a human/machine interface. The first prototype of the artificial hand has been designed and fabricated. The hand is underactuated, and is equipped with opposable thumb and a proprioceptive sensory system. This paper presents the fabrication and experimental characterization of the hand, focusing on the mechanical structure, the actuator system and the proprioceptive sensory system.