Patent ID: 9566444
Date: 2017-02-14
CPC Classifications: A61N

Claim:
1. A cardiac pacemaker comprising: a first cardiac chamber lead branch to sense electrical activity in a first cardiac chamber of a heart and to deliver electrical stimulation to the first cardiac chamber; a second cardiac chamber lead branch to sense electrical activity in a second cardiac chamber of the heart and to deliver electrical stimulation to the second cardiac chamber; a controller to control delivery of electrical pulses to at least one of the first cardiac chamber and the second cardiac chamber based on the electrical activity sensed by at least one of the first cardiac chamber lead branch and the second cardiac chamber lead branch; a first clamping circuit connected to the first cardiac chamber lead branch, the first clamping circuit being configured to reduce, under control of the controller, a voltage level of electrical pulses delivered to the first cardiac chamber through the first clamping circuit and the first cardiac chamber lead branch; and a second clamping circuit connected to the second cardiac chamber lead branch, the second clamping circuit being configured to reduce, under control of the controller, a voltage level of electrical pulses delivered to the second cardiac chamber through the second clamping circuit and the second cardiac chamber lead branch, wherein each of the first and second clamping circuits include a first and a second unity-gain buffer connected in series and two operational amplifiers with outputs respectively connected to an input of the second unity gain buffer via diodes and configured to reduce a voltage therethrough under control of the controller.