| US 7,567,839 B2 | ||
| Self-calibrating rate-adaptive pacemaker | ||
| Weimin Sun, Plymouth, Minn. (US); Bruce R. Jones, Hopkins, Minn. (US); Douglas J. Lang, Arden Hills, Minn. (US); and Donald Hopper, Maple Grove, Minn. (US) | ||
| Assigned to Cardiac Pacemakers, Inc., St. Paul, Minn. (US) | ||
| Filed on Jul. 13, 2006, as Appl. No. 11/457,382. | ||
| Application 11/457382 is a continuation of application No. 10/839875, filed on May 06, 2004, granted, now 7,079,897. | ||
| Application 10/839875 is a continuation of application No. 09/657402, filed on Sep. 08, 2000, granted, now 6,823,214. | ||
| Prior Publication US 2006/0247704 A1, Nov. 02, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A61N 1/18 (2006.01) | ||
| U.S. Cl. 607—19 | 20 Claims |
| 1. A system for automatically adjusting responsiveness of a rate-adaptive pacemaker by using a rate response curve mapping
measured exertion levels to a sensor indicated rate, the system comprising:
means for collecting short-term maximum exertion levels and short-term maximum sensor indicated rates;
means for computing 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 maximum sensor indicated
rates;
means for computing a sensor target rate as a function of the intermediate-term average maximum exertion level and a long-term
maximum exertion level; and
means for periodically adjusting a slope of the rate response curve using the intermediate-term average maximum sensor indicated
rate and the sensor target rate.
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