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Micromodular implants to provide electrical stimulation of paralyzed muscles and limbs

1997; Institute of Electrical and Electronics Engineers; Volume: 44; Issue: 9 Linguagem: Inglês

10.1109/10.623047

1558-2531

Tracy Cameron, Gerald E. Loeb, R.A. Peck, J.H. Schulman, P. Strojnik, Philip R. Troyk,

Advanced Sensor and Energy Harvesting Materials

Describes the design, fabrication, and output capabilities of a microminiature electrical stimulator that can be injected in or near nerves and muscles. Each single channel microstimulator consists of a cylindrical glass capsule with hermetically sealed electrodes in either end (2-mm diameter/spl times/13-mm overall length). Power and digital control data can be transmitted to multiple implants (256 unique addresses) via a 2-MHz RF field created by an external AM oscillator and inductive coil. In vitro testing demonstrated accurate control of output pulsewidth (3-258 /spl mu/s in 1-/spl mu/s steps) and current (0-30 mA in two linear ranges of 16 steps each, up to 8.5 V available compliance voltage). Microstimulators were used successfully for chronic stimulation in hindlimb muscles of cats. Design and fabrication issues affecting yield and reliability of the packaging and electronics are discussed.