JP4249017B2 - 遠方場r波をフィルタリングするための複数のテンプレート - Google Patents
遠方場r波をフィルタリングするための複数のテンプレート Download PDFInfo
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- JP4249017B2 JP4249017B2 JP2003526481A JP2003526481A JP4249017B2 JP 4249017 B2 JP4249017 B2 JP 4249017B2 JP 2003526481 A JP2003526481 A JP 2003526481A JP 2003526481 A JP2003526481 A JP 2003526481A JP 4249017 B2 JP4249017 B2 JP 4249017B2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/37—Monitoring; Protecting
- A61N1/3702—Physiological parameters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
- A61B5/283—Invasive
- A61B5/287—Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/6852—Catheters
- A61B5/6858—Catheters with a distal basket, e.g. expandable basket
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- Health & Medical Sciences (AREA)
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- Animal Behavior & Ethology (AREA)
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- Medical Informatics (AREA)
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- Physiology (AREA)
- Cardiology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Electrotherapy Devices (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
Sun他に対する米国特許第5,778,881号およびSun他に対する米国特許第5,782,888号は、隠れマルコフモデル法をウェーブレット変換とともに使用して、EGM信号中の関心の心臓事象を識別することを記載している。これらの技法は、A−EGM信号中の遠方場R波に関して使用することもできる。
[発明の概要]
本発明は、A−EGM信号から遠方場R波をフィルタリングする技法を対象とし、その結果、心房調律を正確に解釈し適切な治療を送出する。房室事象の性質、レートおよびタイミングに基づき、推定遠方場R波の形態学的モデルすなわち「テンプレート」を複数のテンプレートから選択する。次に、この推定遠方場R波を、望ましくない遠方場R波を含むA−EGM信号から減算する。
図2に示す埋め込み可能PCDは、本発明を実施することができる装置である。図2は、本発明を組み込むことができる1つのタイプの装置の例示として解釈されるべきである。本発明は、図2に示す例示的な装置に限定されず、多様なデバイス実施態様(ペースメーカやICDなど)で実施することができる。
サンプリング時間kにおける推定遠方場R波=Wk(r)
したがって、サンプリング時間kにおけるフィルタリングされた信号370(ekで示す)は、サンプリング時間kにおけるA−EGM信号352全体からWk(r)を引いたものとなる。係数である重みは、次式のように更新される。
Wk+1=Wk+(μ×Xk×ek)
ここでμは、収束速度を表す適応係数である。通常の適応係数は、1/2、1/4、1/8、または1/16であり得る。これらの適応係数の各々は2の累乗であるので、サンプリング時間kにおけるフィルタリングされた信号370をビットシフトすることによって実現することができる。
i<rである場合に、Wk+1(i)=Wk(i)+(μ×Xk−1×ek−i)
i=rである場合に、Wk+1(i)=Wk(i)+(μ×ek−i)
iがそれ以外である場合は全て、Wk+1(i)=Wk(i)
フィルタの重みの更新は、いずれのサンプル時間においても更新される係数が1つであるように行われる。N個全ての重みを更新すると、適応フィルタ360は、次のタイミングウインドウまで停止したままとすることができる。適応フィルタ360は停止している間、低電力構成をとる。
A−EGM信号およびV−EGM信号は、遠方場R波のフィルタリングの一部または他の信号解析の一部として、さらなる処理を受けてもよい。たとえば、A−EGM信号およびV−EGM信号を処理前に整流することにより、結果として推定遠方場R波およびフィルタリングされたA−EGMも整流することができる。
上記および他の実施形態は添付の特許請求項の範囲内にある。
Claims (5)
- 心房リード線と、
複数の推定遠方場R波から推定遠方場R波を選択し、該選択した推定遠方場R波を、前記心房リード線から受け取った心房電位図信号から減算するフィルタと、
を備える装置。 - 前記心房電位図信号と前記選択した遠方場R波との間の差は、フィルタリングされた心房電位図信号を成すこと、および前記フィルタリングされた心房電位図信号を事前に選択された心房検知しきい値と比較し、前記フィルタリングされた心房電位図信号が前記心房検知しきい値を超えた場合に心房検知信号を生成する比較器をさらに備える請求項1に記載の装置。
- 前記フィルタは、前記心房電位図信号と前記選択した推定遠方場R波との間の差を受け取り、該差に応じて第2推定遠方場R波を生成する請求項1に記載の装置。
- 複数の推定遠方場R波を記憶するメモリをさらに備える請求項1に記載の装置。
- 心室リード線と、
該心室リード線から受け取った心室信号を事前に選択された心室検知しきい値と比較し、前記心室信号が前記心室検知しきい値を超えた場合に心室検知信号を生成する比較器と、
をさらに備える請求項1に記載の装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/951,320 US6810283B2 (en) | 2001-09-13 | 2001-09-13 | Multiple templates for filtering of far field R-waves |
PCT/US2002/028460 WO2003022356A2 (en) | 2001-09-13 | 2002-09-06 | Multiple templates for filtering of far field r-waves |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005501674A JP2005501674A (ja) | 2005-01-20 |
JP4249017B2 true JP4249017B2 (ja) | 2009-04-02 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003526481A Expired - Fee Related JP4249017B2 (ja) | 2001-09-13 | 2002-09-06 | 遠方場r波をフィルタリングするための複数のテンプレート |
Country Status (7)
Country | Link |
---|---|
US (1) | US6810283B2 (ja) |
EP (1) | EP1427473B1 (ja) |
JP (1) | JP4249017B2 (ja) |
AT (1) | ATE411831T1 (ja) |
CA (1) | CA2459345A1 (ja) |
DE (1) | DE60229540D1 (ja) |
WO (1) | WO2003022356A2 (ja) |
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2001
- 2001-09-13 US US09/951,320 patent/US6810283B2/en not_active Expired - Lifetime
-
2002
- 2002-09-06 WO PCT/US2002/028460 patent/WO2003022356A2/en active Application Filing
- 2002-09-06 EP EP02759575A patent/EP1427473B1/en not_active Expired - Lifetime
- 2002-09-06 AT AT02759575T patent/ATE411831T1/de not_active IP Right Cessation
- 2002-09-06 DE DE60229540T patent/DE60229540D1/de not_active Expired - Lifetime
- 2002-09-06 CA CA002459345A patent/CA2459345A1/en not_active Abandoned
- 2002-09-06 JP JP2003526481A patent/JP4249017B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2459345A1 (en) | 2003-03-20 |
JP2005501674A (ja) | 2005-01-20 |
US20030050563A1 (en) | 2003-03-13 |
EP1427473A2 (en) | 2004-06-16 |
US6810283B2 (en) | 2004-10-26 |
DE60229540D1 (de) | 2008-12-04 |
ATE411831T1 (de) | 2008-11-15 |
EP1427473B1 (en) | 2008-10-22 |
WO2003022356A3 (en) | 2003-10-16 |
WO2003022356A2 (en) | 2003-03-20 |
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