Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1996-09-17
1998-03-03
Kamm, William F.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
128734, A61N 137
Patent
active
057229970
ABSTRACT:
A method and apparatus for measuring impedance of heart tissue or the leads associated with a cardiac stimulation apparatus involves charging a capacitor, storing the value of the voltage across the capacitor when charged, discharging the capacitor into said lead/heart system and storing the voltage on said capacitor when discharged. The two voltages may then be used to determine the combined impedance of the lead and the heart tissue. This may be advantageously accomplished by using separate circuits to measure each of the voltages of the capacitor and storing those voltages. These voltages then may be applied to an analog-to-digital converter which converts the ratio of said voltages to digital form. This value can then be used to calculate the combined impedance of the heart tissue or the lead. If one of the two impedances is known the other can then be easily determined.
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Aria Behrad
Nedungadi Ashok P.
Kamm William F.
Merkling John R.
Schaetzle Kennedy J.
Sulzer Intermedics Inc.
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