| US 7,515,955 B2 | ||
| Method and apparatus for adjusting cardiac event detection threshold based on dynamic noise estimation | ||
| William J. Linder, Golden Valley, Minn. (US); Jeremy Maniak, Columbia Heights, Minn. (US); and Ron A. Balczewski, Bloomington, Minn. (US) | ||
| Assigned to Cardiac Pacemakers, Inc., St. Paul, Minn. (US) | ||
| Filed on Nov. 07, 2006, as Appl. No. 11/557,318. | ||
| Application 11/557318 is a continuation of application No. 10/967660, filed on Oct. 18, 2004, granted, now 7,155,275. | ||
| Prior Publication US 2007/0088399 A1, Apr. 19, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A61B 5/0402 (2006.01) | ||
| U.S. Cl. 600—509 [600/508; 128/901] | 20 Claims |
| 1. A cardiac rhythm management device, comprising:
one or more sensing channels each including:
a sensing circuit to sense a cardiac signal, the sensing circuit including a signal filter adapted to produce a filtered cardiac
signal using the sensed cardiac signal, the filtered cardiac signal having a signal frequency band;
a noise estimation circuit coupled to the sensing circuit, the noise estimation circuit including a noise filter adapted to
produce a noise signal using the sensed cardiac signal, the noise signal having a noise frequency band within and substantially
narrower than the signal frequency band; and
an event detection circuit coupled to the sensing circuit and the noise estimation circuit, the event detection circuit adapted
to produce a detection threshold using at least the filtered cardiac signal and the noise signal and to detect cardiac electrical
events using the filtered cardiac signal and the detection threshold.
|