Implantable medical device system with method for determining le

Details Implantable medical device system with method for determining le Implantable medical device system with method for determining le

1996-06-27

1998-04-21

Lateef, Marvin M.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 137

Patent

active

057413118

ABSTRACT:
In an implantable medical device system such as a pacemaker system, there is provided a system and method for measuring lead impedance so as to obtain reliable data concerning any indication of the need to replace the lead. A relatively short duration low current AC burst is delivered after a standard pacing pulse, at a time to coincide with the heart's refractory period. The pulse is long enough in duration, e.g., 50-125 ms and preferably around 100 ms, to achieve the benefit of substantially steady state measurement, but short enough to substantially avoid the possibility of inducing any cardiac arrhythmia. The current level of the burst is limited to about 30 microamps, providing a further factor of safety against inducing an unwanted arrhythmia. The PPAC technique is adaptable for automatic measurement within an implantable device, or for implementation involving an external programmer which triggers the test.

REFERENCES:
patent: 4805621 (1989-02-01), Heinze et al.
patent: 4899750 (1990-02-01), Ekwall
patent: 4964407 (1990-10-01), Baker, Jr. et al.
patent: 5003975 (1991-04-01), Hafelfinger et al.
patent: 5201865 (1993-04-01), Kuehn
patent: 5233986 (1993-08-01), Robson
patent: 5318593 (1994-06-01), Duggan
Pending Patent Application, Wahlstrand et al., "Automatic Lead Recognition For Implantable Medical Device," U.S. application Ser. No. 08/346,661, filed Nov. 30, 1994.

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