CA2219307A1 - Apparatus and method for discriminating flow of blood in a cardiovascular system - Google Patents

Apparatus and method for discriminating flow of blood in a cardiovascular system

Info

Publication number
CA2219307A1
CA2219307A1 CA002219307A CA2219307A CA2219307A1 CA 2219307 A1 CA2219307 A1 CA 2219307A1 CA 002219307 A CA002219307 A CA 002219307A CA 2219307 A CA2219307 A CA 2219307A CA 2219307 A1 CA2219307 A1 CA 2219307A1
Authority
CA
Canada
Prior art keywords
blood
shock
potential
stimulating electrodes
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002219307A
Other languages
French (fr)
Other versions
CA2219307C (en
Inventor
Chris A. Bonnerup
Mohammed Z. Munshi
John P. Rosborough
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intermedics Inc
Original Assignee
Chris A. Bonnerup
Mohammed Z. Munshi
Sulzer Intermedics Inc.
John P. Rosborough
Intermedics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chris A. Bonnerup, Mohammed Z. Munshi, Sulzer Intermedics Inc., John P. Rosborough, Intermedics Inc. filed Critical Chris A. Bonnerup
Publication of CA2219307A1 publication Critical patent/CA2219307A1/en
Application granted granted Critical
Publication of CA2219307C publication Critical patent/CA2219307C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3918—Heart defibrillators characterised by shock pathway, e.g. by electrode configuration

Abstract

An implantable cardiac stimulator includes means for delivering a first electrical shock via implantable stimulating electrodes at a time when there is substantially no flow of blood, as determined by conventional fibrillation detection means. At least one of the stimulating electrodes is disposed in a blood flow path of the cardiovascular system. The first shock is preferably of insufficient energy level to cause defibrillation. A potential is measured as a function of time between the blood-contacting electrode and a reference electrode following delivery of the first shock to obtain a first potential equilibration function under no-flow conditions. A second therapeutic electrical shock, preferably of sufficient energy level to effect defibrillation, is delivered via the stimulating electrodes. A second potential equilibration function is measured following delivery of the second shock. The first and second potential equilibration functions are compared, and if the two functions are sufficiently different in morphology, it is determined that blood is flowing.
CA002219307A 1995-06-02 1996-05-31 Apparatus and method for discriminating flow of blood in a cardiovascular system Expired - Fee Related CA2219307C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/458,952 1995-06-02
US08/458,952 US5782879A (en) 1995-06-02 1995-06-02 Apparatus and method for discriminating flow of blood in a cardiovascular system
PCT/US1996/008180 WO1996038201A1 (en) 1995-06-02 1996-05-31 Apparatus and method for discriminating flow of blood in a cardiovascular system

Publications (2)

Publication Number Publication Date
CA2219307A1 true CA2219307A1 (en) 1996-12-05
CA2219307C CA2219307C (en) 2001-07-24

Family

ID=23822768

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002219307A Expired - Fee Related CA2219307C (en) 1995-06-02 1996-05-31 Apparatus and method for discriminating flow of blood in a cardiovascular system

Country Status (5)

Country Link
US (1) US5782879A (en)
EP (1) EP0828532A1 (en)
JP (1) JP2001501487A (en)
CA (1) CA2219307C (en)
WO (1) WO1996038201A1 (en)

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Also Published As

Publication number Publication date
CA2219307C (en) 2001-07-24
US5782879A (en) 1998-07-21
WO1996038201A1 (en) 1996-12-05
EP0828532A1 (en) 1998-03-18
JP2001501487A (en) 2001-02-06

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