Title:
皮下心電図の波形から心臓のR波を感知する方法及び装置
Document Type and Number:
Japanese Patent JP2005537888
Kind Code:
A
Abstract:
The present invention uses a R-wave sensing algorithm that uniquely combines an automatic threshold adjustment method with a new noise rejection technique. This algorithm has significant advantages in avoiding the sensing of T-waves, P-waves, and noise/artifacts. Detecting the presence of noise bursts uses features that determine if an R-R interval adjacent to or within the noise signal is valid. Circuitry that discriminates noise signals from R-waves can use any one of several features including, but not limited to, the following: detection events occurring so close together that they are outside normal physiologic heart rates; frequency content that is wider than that of QRS complexes; amplitudes that are different than the adjacent or encompassing R-waves; and amplitudes that display greater than normal variability. The present invention employs multiple discrete thresholds optionally with different decay constants, alone or in combination with one or more substantially constant magnitude sensing threshold.
Inventors:
Khao, Gien
Lee, Brian Bee
Kane, Michael Earl
Hard, spencer are
Lee, Brian Bee
Kane, Michael Earl
Hard, spencer are
Application Number:
JP2004536079A
Publication Date:
December 15, 2005
Filing Date:
September 02, 2003
Export Citation:
Assignee:
Medtronic Incorporated
International Classes:
A61B5/352; A61B5/364; (IPC1-7): A61B5/0456
Domestic Patent References:
| JPH06205847A | 1994-07-26 |
Foreign References:
| US6377851B1 | 2002-04-23 | |||
| US6236882B1 | 2001-05-22 | |||
| US5709215A | 1998-01-20 | |||
| WO2002056961A2 | 2002-07-25 |
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fujihiro Kanda
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fujihiro Kanda