Implantable pacemaker having means for automatically adjusting s

Details Implantable pacemaker having means for automatically adjusting s Implantable pacemaker having means for automatically adjusting s

Filed on

1991-03-21

Date issued

1993-01-05

Examiner

Howell, Kyle L.

Patent Class

Surgery

SubClass

Truss

SubSubClass

Pad

Other Related Categories

A61N 1362

Type

Patent

Status

active

Patent number

051761386

Description

ABSTRACT:
An implantable programmable pacemaker includes a sensor for measuring SO.sub.2 levels in blood on a periodic basis, e.g., every 15 seconds, while the pacemaker is operating in its programmed mode of operation. The energy of stimulation pulses generated by the pacemaker is automatically adjusted, as required, in order to maintain a prescribed level of SO.sub.2 in the blood. At least a minimum level of SO.sub.2 is presumed when the stimulation pulses are of sufficient energy to effectuate capture. Hence, the SO.sub.2 level is monitored to provide an indication of whether capture has been lost, and if so, to increase the stimulation energy. In one embodiment, the stimulation energy is increased by first increasing the pulse width of the stimulation pulse a prescribed amount. After the pulse width has been increased a maximum amount, and if capture is still lost, the stimulation energy is further increased by increasing the pulse amplitude a prescribed amount. After the pulse amplitude has been increased a maximum amount, and if capture is still lost, the operating mode of the pacemaker is changed, and the stimulation energy is reset to an appropriate value.

REFERENCES:
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patent: 4399820 (1983-08-01), Wirtzfeld et al.
patent: 4686988 (1987-08-01), Sholder
patent: 4712555 (1987-12-01), Thornander et al.
patent: 4750495 (1988-06-01), Moore et al.
patent: 4791935 (1988-12-01), Baudino et al.
patent: 4809697 (1989-03-01), Causey et al.
patent: 4815469 (1989-03-01), Cohen et al.
patent: 4940052 (1990-07-01), Mann et al.
patent: 4944299 (1990-07-01), Silvian
"A Practice of Cardiac Pacing", Furman et al., Futura Publishing Co., Mt. Kisco N.Y., 1986 pp. 27-73.

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