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US 8,644,923 B2Granted
Determination of upper limit of vulnerability using a variable number of shocks
AssigneesMedtronic, Inc., Imperception, Inc.
InventorsPaul A. Belk, Charles D. Swerdlow, Linda L. Ruetz
Life of this patent
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Abstract
A method and apparatus sense a cardiac electrical signal and determine a signal quality parameter of the cardiac electrical signal. A number of shock pulses to be delivered to a patient's heart is determined in response to the signal quality parameter. Each of the shock pulses are scheduled to be delivered at a unique offset from a T-wave shock interval in one embodiment of the invention.
Claims21
A method, comprising:
- sensing a cardiac electrical signal;
- determining a signal quality parameter of the cardiac electrical signal;
- comparing the signal quality parameter to a signal quality threshold;
- based on the comparison of the signal quality parameter to the signal quality threshold, determining a number of shock pulses for a shocking sequence including a plurality of shock pulses to be delivered to a patient's heart, wherein the number of shock pulses is determined to be a first number of shock pulses when the signal quality parameter is less than the signal quality threshold, and the number of shock pulses is determined to be a second number of shock pulses different than the first number of shock pulses when the signal quality parameter is greater than the signal quality threshold;
- and
- scheduling the determined number of shock pulses to be delivered.
3 more elements
An implantable medical device, comprising:
- electrodes for sensing a cardiac electrical signal and for delivering a shock pulse to a patient's heart;
- a sensing module coupled to the electrodes for receiving the cardiac signal and analyzing the sensed signal for determining a signal quality parameter of the cardiac electrical signal and comparing the signal quality parameter to a signal quality threshold;
- a shock pulse generating module coupled to the electrodes for delivering the shock pulse;
- and
- a control module coupled to the sensing module and the shock pulse generating module and configured to, based on the comparison of the signal quality parameter to the signal quality threshold, automatically determine a number of shock pulses to be delivered to the patient's heart for a shocking sequence including a plurality of shock pulses, wherein the number of shock pulses is determined to be a first number of shock pulses when the signal quality parameter is less than the signal quality threshold, and the number of shock pulses is determined to be a second number of shock pulses different than the first number of shock pulses when the signal quality parameter is greater than the signal quality threshold;
- the control module, sensing module, and shock pulse generating module configured to cooperatively deliver the scheduled determined number of shock pulses.
3 more elements
A computer readable storage medium for storing a set of instructions which when implemented in a medical device system cause the system to:
- analyze a cardiac electrical signal;
- determine a signal quality parameter of the cardiac electrical signal;
- compare the signal quality parameter to a signal quality threshold;
- based on the comparison of the signal quality parameter to the signal quality threshold, determine a number of shock pulses for a shocking sequence including a plurality of shock to be delivered to a patient's heart, wherein the number of shock pulses is determined to be a first number of shock pulses when the signal quality parameter is less than the signal quality threshold, and the number of shock pulses is determined to be a second number of shock pulses different than the first number of shock pulses when the signal quality parameter is greater than the signal quality threshold;
- and
- schedule the determined number of shock pulses to be delivered.
3 more elements
Dependencies are inferred from the claim text.