Implantable cardiac assist device having differential signal det

Details Implantable cardiac assist device having differential signal det Implantable cardiac assist device having differential signal det

1997-06-06

1999-02-16

Getzow, Scott M.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 1365

Patent

active

058715070

ABSTRACT:
A heart stimulator, operable for single-chamber and/or dual-chamber pacing, includes a first unipolar electrical lead placeable in the atrium of a heart, and a second unipolar electrical lead placeable in the ventricle of the heart. In the heart stimulator, a differential detector is connected to each of these unipolar leads and detects a differential signal representative of cardiac activity between the atrial electrode and the ventricular electrode. The differential signal is supplied to decision logic which evaluates each of those outputs including using a morphology analysis, if necessary. Depending on the type of cardiac activity identified as a result of the evaluation, the decision logic supplies a signal to a control unit in the heart stimulator to cause the therapy administered by the heart stimulator to be altered as warranted. The decision logic may also derive a respiration signal from the differential signal, which can also be used to modify the administered therapy.

REFERENCES:
patent: 4905708 (1990-03-01), Davies
patent: 5417718 (1995-05-01), Kleks et al.
patent: 5458623 (1995-10-01), Lu et al.
patent: 5571143 (1996-11-01), Hoegnelid et al.
patent: 5607457 (1997-03-01), Schuller
"Detection of Pathological Tachycardia by Analysis of Electrogram Morphology," Davies, et al., PACE, vol. 9, Mar.-Apr., 1986, pp. 200-208.

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