Method and apparatus for calculating and monitoring the impedanc

Details Method and apparatus for calculating and monitoring the impedanc Method and apparatus for calculating and monitoring the impedanc

1996-08-09

1997-07-22

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

128697, A61N 108

Patent

active

056499698

ABSTRACT:
A method and apparatus for calculating and monitoring the impedance of an implanted pacemaker lead, and in particular to such a method and apparatus for monitoring the impedance to determine whether a lead fault, such as a lead rupture or a lead dislocation, has occurred. In order to avoid reprogramming the implanted pacemaker to deliver a pulse having known parameters in order to permit an impedance measurement to be made, the method and apparatus operate on the basis of the system formed by the pulse generator, the electrode leads and body tissue being considered to behave as an RC circuit, with the pulse generator emitting an ideal square wave pulse which then exhibits an exponential decay in the body tissue having a decay time constant associated therewith. From surface ECG measurements, the decay time constant is estimated, and since the capacitance of the pulse generator is known, the lead impedance can then be calculated. A determination can then be made whether the calculated lead impedance deviates from the nominal lead impedance to such an extent that a malfunction is assumed to be present.

REFERENCES:
patent: 4140131 (1979-02-01), Dutcher et al.
patent: 4899750 (1990-02-01), Ekwall
patent: 5385576 (1995-01-01), Noren et al.
patent: 5423871 (1995-06-01), Hoegnelid et al.
patent: 5431692 (1995-07-01), Hansen et al.

Affiliated with

Also associated with

Rating

Method and apparatus for calculating and monitoring the impedanc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for calculating and monitoring the impedanc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for calculating and monitoring the impedanc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1557423