Self-calibrating rate-adaptive pacemaker
First Claim
Patent Images
1. A rate-adaptive pacemaker, comprising:
- a sensor adapted to sense exertion levels; and
a microprocessor coupled to the sensor, the microprocessor adapted to;
collect short-term maximum exertion levels;
update a long-term maximal exertion level periodically by setting the long-term maximal exertion level to a maximum of the short-term maximum exertion levels collected during a specified time period; and
adjust a response factor, the response factor being a slope of a rate response curve mapping exertion levels to sensor indicated rates, wherein the response factor is adjusted such that the updated long-term maximal exertion level is mapped to a specified maximum sensor indicated rate.
0 Assignments
0 Petitions
Accused Products
Abstract
A system and method for automatically adjusting the operating parameters of a rate-adaptive cardiac pacemaker. In accordance with the method, maximum exertion levels attained by the patient are measured at periodic intervals and stored. The stored maximum exertion levels may then be used to update a long-term maximal exertion level, and the slope of the rate-response curve is adjusted to map the updated long-term maximal exertion level to a maximum allowable pacing rate. The stored maximum exertion levels may also be used to update a sensor target rate which is used to adjust the slope of the rate response curve.
57 Citations
20 Claims
-
1. A rate-adaptive pacemaker, comprising:
-
a sensor adapted to sense exertion levels; and a microprocessor coupled to the sensor, the microprocessor adapted to; collect short-term maximum exertion levels; update a long-term maximal exertion level periodically by setting the long-term maximal exertion level to a maximum of the short-term maximum exertion levels collected during a specified time period; and adjust a response factor, the response factor being a slope of a rate response curve mapping exertion levels to sensor indicated rates, wherein the response factor is adjusted such that the updated long-term maximal exertion level is mapped to a specified maximum sensor indicated rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A rate-adaptive pacemaker, comprising:
-
a sensor adapted to sense exertion levels; and a microprocessor coupled to the sensor, the microprocessor adapted to; collect short-term maximum exertion levels and short-term maximum sensor indicated rates; compute an intermediate-term average maximum exertion level being an average of the short-term maximum exertion levels and an intermediate-term average maximum sensor indicated rate being an average of the short-term sensor indicated rates; compute a sensor target rate as a function of the intermediate-term average short-term maximum exertion level and a maximum exercise capacity as defined by a long-term maximum exertion level; and adjust a response factor using the intermediate-term average maximum sensor indicated rate and the sensor target rate, the response factor being a slope of a rate response curve that maps exertion levels to sensor indicated rates. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification