Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1996-08-06
1998-02-10
Lateef, Marvin M.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 5, 607 7, A61N 139
Patent
active
057163812
ABSTRACT:
An electrophysiology diagnostic device generating a high voltage (HV) pulse of a predetermined shape, which device is electrically connected to a patient's heart, i.e., a load resistance and which device includes a microprocessor and a load resistance measuring device, consists of a rapid response voltage threshold determination (RRVTD) circuit and a variable capacitance emulation (VCE) circuit. The RRVTD circuit receives an actual signal corresponding to the HV pulse waveform, compares the actual signal with a desired signal and produces an error signal when the actual signal deviates from the desired signal by a predetermined threshold value. The VCE circuit, which is capable of emulating a selected capacitance C, includes a fixed capacitor C.sub.0, and first and second branch circuits including respective resistors R.sub.1 and R.sub.2 and corresponding switching elements, connected in parallel with the load resistance R.sub.L. According to one aspect of the VCE circuit, the selected .vertline..vertline.R.sub.eff)*C.sub.0 !/R.sub.L, where R.sub.eff is an effective resistance value produced by pulse width modulation control of at least one of the resistors R.sub.1 and R.sub.2 using corresponding switch elements. The individual circuits, respective methods for operating the same as well as methods for operating the electrophysiology diagnostic device are all described.
REFERENCES:
patent: 3624530 (1971-11-01), Zwirn
patent: 5111813 (1992-05-01), Charbonnier et al.
patent: 5312442 (1994-05-01), O'Phelan
patent: 5350403 (1994-09-01), Stroetmann et al.
patent: 5385575 (1995-01-01), Adams
Lateef Marvin M.
Layno Carl H.
Mitchell Steven M.
Pacesetter Inc.
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