Output stage with switchable constant current modes

Details Output stage with switchable constant current modes Output stage with switchable constant current modes

1997-06-19

1998-11-17

Jastrzab, Jeffrey R.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 68, 607 72, 607 32, 607 60, A61N 1362

Patent

active

058369830

ABSTRACT:
An output circuit is provided for delivering output pulses in either a constant voltage or constant current mode. The output circuit has a simple architecture built around a pair of area-ratioed transistors which operate in a linear range carrying a ratio of currents corresponding to the area ratio. The circuit is mode controlled by a switch network which connects to a constant current source, which constant current source controls the pulse amplitude, either current or voltage. As used in a pacemaker embodiment, the circuit is controllable to control the mode and/or amplitude of the pulse following a cyclical decision to deliver a pulse, and with an amplitude derived from pacemaker data and controllable during delivery of the pulse. The circuit has high speed control which enables amplitude modulation of the pulse, for transmitting encoded data to an external device adapted to receive the data.

REFERENCES:
patent: 4340062 (1982-07-01), Thompson et al.
patent: 4416282 (1983-11-01), Saulson et al.
Breivik, K. et al., "Electrophysiological Properties of a New Permanent Endocardial Lead for Uni-and Bipolar Pacing," PACE 5, Mar.-Apr. 1982, pp. 268-274.
Ector et al., "Measurement of Pacing Threshold," PACE 8, Jan.-Feb. 1985, pp. 66-72.
Hogan, James F. et al., "Electrical Techniques for Stimulation of the Phrenic Nerve to Pace the Diaphragm: Inductive Coupling and Battery Powered Total Implant in Asynchronous and Demand Modes," PACE, vol. 12, May 1989, pp. 847-853.
"Pulse Generator Output Stage With Programmable Output Voltage," Research Disclosure, Jun. 1993, p. 374.

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