Date of Award
Spring 1986
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Biomedical Engineering
First Advisor
Jeutter, Dean C.
Second Advisor
Jodat, Ronald W.
Third Advisor
Mickelson, Timothy C.
Abstract
A transcutaneous programmable microcontroller based neurostimulation system has been developed and implemented using Small Outline CMOS integrated circuitry. The system utilizes CMOS programmable microcontrollers to provide the data interface between the external RF serial communication and the implantable stimulator circuitry. The external controller provides UART, transmitted parameter display, and parameter selection functions. The external RF section operates at a carrier frequency of 3.58 MHz, and when encoded at a 260 Hz clock rate, initiates non-invasive data transfer to the stimulator. In addition, the external RF section is capable of transcutaneous delivery of a recharging current of 33-40 mA to an implantable power source. The stimulator controller acts as a UART and provides timing and amplitude control to produce selectable biphasic pulses to implanted electrodes. Stimulation parameters provided for are all combinations of rate from 1 to 255 pulses per second for 31 predefined rates; amplitudes from O to 9.9 mA in increments of 0.3 mA/step; and pulse durations of 80 to 500μs in 60 μs increments. Transmitted serial data strings utilize parity and data encoding to assure noise immunity, thus protecting against erroneous output states. Long term timing stability is achieved by the use of high stability quartz crystals. Reliability, size, low power consumption, long term stability, and remote module lifetime make this system ideal for applications where chronic stimulation may be required.
Recommended Citation
Geisler, Mark Steven, "An Externally Programmable Microcontroller Based Neural Stimulator" (1986). Master's Theses (1922-2009) Access restricted to Marquette Campus. 4673.
https://epublications.marquette.edu/theses/4673