Cardiac rhythm management system with ultrasound for autocapture or other applications
First Claim
1. A cardiac rhythm management system including:
- a lead, including a distal end and a proximal end, the distal end of the lead adapted for being disposed in or about a heart, the distal end of the lead including a first ultrasonic element; and
an electronics unit coupled to the proximal end of the lead, the electronics unit including;
an ultrasound driving circuit; and
a signal processing circuit that processes a signal that is based on ultrasound.
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Accused Products
Abstract
A cardiac rhythm management system provides ultrasound autocapture capability for determining whether a stimulation has evoked a desired response from the heart, and for adjusting an energy of the stimulation based on the observed response from the heart. A first ultrasound element is disposed on a lead in the heart. A second ultrasound element is disposed elsewhere in the heart or in the implanted device. An autocapture determination circuit determines whether motion of the heart chamber indicates a contraction in response to the stimulation, and adjusts the stimulation energy to provide only that energy which is needed to obtain capture. This saves energy, prolonging the life of the implanted device, minimizing the risk and expense to patient associated with early explantation and replacement of the implanted device. Other applications include using ultrasound for (1) determining the strength of heart contractions (2) determining dissociation between electrical and mechanical heart activity, (3) determining the volume of the heart, (4) determining the origin of sensed intrinsic electrical heart activity signals, (5) recognizing particular arrhythmias (6) disrupting cell membranes for lowering stimulation thresholds, (7) controlling the delivery of a steroid, and (8) obtaining blood flow information.
56 Citations
34 Claims
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1. A cardiac rhythm management system including:
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a lead, including a distal end and a proximal end, the distal end of the lead adapted for being disposed in or about a heart, the distal end of the lead including a first ultrasonic element; and
an electronics unit coupled to the proximal end of the lead, the electronics unit including;
an ultrasound driving circuit; and
a signal processing circuit that processes a signal that is based on ultrasound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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17. A method comprising:
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disposing a first ultrasonic element in a first heart chamber;
obtaining a first electrical signal, which includes mechanical heart contraction information, using the ultrasonic element; and
providing cardiac rhythm management therapy based on the first electrical signal.
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Specification