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Micromodular implants to provide electrical stimulation of paralyzed muscles and limbs

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6 Author(s)
Cameron, T. ; Biomed. Eng. Unit, Queen''s Univ., Kingston, Ont., Canada ; Loeb, G.E. ; Peck, R.A. ; Schulman, J.H.
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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×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 μs in 1-μs 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.

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Biomedical Engineering, IEEE Transactions on  (Volume:44 ,  Issue: 9 )