Meter for measuring battery charge delivered in an implantable d

Details Meter for measuring battery charge delivered in an implantable d Meter for measuring battery charge delivered in an implantable d

1996-10-15

1998-06-23

Getzow, Scott M.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 1378

Patent

active

057698732

ABSTRACT:
An improved apparatus and method are described for providing a measurement of the charge depleted from a battery used in an implantable device such as a cardiac pacemaker. The measurement is provided not by measuring the voltage level or impedance of the battery, but rather by continuously measuring the electrical current drawn from the battery and integrating that measured current over an integration time period. A precision current-sensing resistor provides a sense signal having a voltage that varies according to the magnitude of current being drawn, and this sense signal is integrated using a voltage-controlled oscillator circuit and counter, which are implemented using CMOS circuitry arranged in a switched-capacitor topology.

REFERENCES:
patent: 4290429 (1981-09-01), Blaser
patent: 5092330 (1992-03-01), Duggan
patent: 5193538 (1993-03-01), Ekwall
patent: 5325041 (1994-06-01), Briggs
patent: 5336242 (1994-08-01), Zadeh
patent: 5458624 (1995-10-01), Renirie et al.
patent: 5496353 (1996-03-01), Grandjean et al.

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