Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1991-10-31
1994-12-20
Manuel, George
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 23, 607 25, 607 28, A61N 1365
Patent
active
053742826
ABSTRACT:
A pacemaker capable of automatically adjusting the sensitivity of its sense amplifier to electrical cardiac signals is disclosed. In one embodiment, a pacemaker having a pressure sensor disposed on the distal end of its pacing/sensing lead counts the number of pressure events and electrical events which occur during an autosensitivity timing period. If the number of electrical events exceeds the number of pressure events by more than a predetermined margin, the sense amplifier's sensitivity threshold is decreased. If the number of electrical events does not exceed the number of pressure events by more than the predetermined margin, the sense amplifier's sensitivity threshold is increased. In another embodiment, the pacemaker maintains a running average of the peak voltages of sensed electrical events over a predetermined history period. Periodically, the pacemaker computes the ratio of the running average of peak voltages to a preprogrammed sense margin value, and adjusts the sensitivity threshold of the sense amplifier according to this computation. By basing the adjustment of the sense amplifier's sensitivity threshold on a long-term average of peak sense values, the effects of cycle-to-cycle variation in sensed values are minimized. In still another embodiment of the invention, a pressure sensor alone is employed to detect natural cardiac events.
REFERENCES:
patent: 4407296 (1983-10-01), Anderson
patent: 4485813 (1984-12-01), Anderson et al.
patent: 4556063 (1985-12-01), Thompson et al.
patent: 4640285 (1987-12-01), DeCote, Jr. et al.
patent: 4708144 (1987-11-01), Hamilton et al.
patent: 4766902 (1988-08-01), Schroeppel
patent: 4768511 (1988-09-01), DeCote, Jr.
patent: 4827934 (1989-05-01), Ekwall
patent: 4880004 (1989-11-01), Baker, Jr. et al.
patent: 4903699 (1990-02-01), Baker, Jr. et al.
patent: 5081987 (1992-01-01), Nigam
patent: 5127404 (1992-07-01), Wyborny et al.
patent: 5133349 (1992-07-01), Heinze
patent: 5134997 (1992-08-01), Bennett et al.
patent: 5137019 (1992-08-01), Pederson et al.
Bennett Tom D.
Nichols Lucy M.
Roline Glenn M.
Thompson David L.
Manuel George
Medtronic Inc.
Patton Harold R.
LandOfFree
Automatic sensitivity adjust for cardiac pacemakers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic sensitivity adjust for cardiac pacemakers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic sensitivity adjust for cardiac pacemakers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2384607