A distributed neural signal sensor system

In this paper the design of an implantable neural signal sensing system is described. The system is distributed with in the patient's body to allow a very low mass neural signal sensor to be placed at the optimum site for sensing with control of the sensor and external interfacing for power and data transmission in the abdominal cavity, where more space is available. A digital communication strategy between the two parts of the system is described, and shown to operate effectively over an implantable cable.

I. Introduction

An ability to chronically implant neural signal sensors into a patient has considerable value as it provides the possibility of closed–loop neuroprostheses through the sensing of neural responses to force, slip and contact [1], [2], [3]. In order to create this ability, it is necessary to provide for neural signal sensing within limbs where space is tightly constrained, and significant movement occurs. The neural signal sensors must therefore be very small and light and must not place undue stress on the nerve bundle. Connection to the nerve bundle is best achieved by the use of a nerve cuff electrode which can be chronically implanted without harm to the patient.