CA2027745A1 - Dual indifferent electrode - Google Patents

Dual indifferent electrode

Info

Publication number
CA2027745A1
CA2027745A1 CA2027745A CA2027745A CA2027745A1 CA 2027745 A1 CA2027745 A1 CA 2027745A1 CA 2027745 A CA2027745 A CA 2027745A CA 2027745 A CA2027745 A CA 2027745A CA 2027745 A1 CA2027745 A1 CA 2027745A1
Authority
CA
Canada
Prior art keywords
electrode
signal
sensing
pair
demodulator
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
CA2027745A
Other languages
French (fr)
Other versions
CA2027745C (en
Inventor
John A. Hauck
Brian D. Pederson
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.)
Cardiac Pacemakers Inc
Original Assignee
Cardiac Pacemakers 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24004398&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2027745(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Cardiac Pacemakers Inc filed Critical Cardiac Pacemakers Inc
Publication of CA2027745A1 publication Critical patent/CA2027745A1/en
Application granted granted Critical
Publication of CA2027745C publication Critical patent/CA2027745C/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
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
    • A61N1/36514—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure
    • A61N1/36521—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure the parameter being derived from measurement of an electrical impedance

Abstract

An endocardial lead having first and second spaced apart electrodes resides in a patient's heart. The first electrode is a sensing electrode and the second electrode is a carrier signal driving electrode. The lead has a conductor coupling a source of alternating current carrier signals of a predetermined frequency to the second electrode. A third electrode is in electrical contact with body tissues. A cardiac pacer apparatus includes a pacer can which functions as a fourth electrode and has a plastic top wherein the third electrode is located. Said third electrode acts in cooperation with the first electrode to form a pair of sensing electrodes. The sensing electrode pair is further coupled to a sense amplifier for receiving an amplifying modulated electrical signals developed across the sensing electrode pair. A demodulator and filters circuit for demodulating the modulated carrier signal and recovering the modulating signal therefrom is connected to the output of the sense amplifier. The modulating signal is proportional to instantaneous stroke volume of the patient's heart and the demodulator and filters circuit develops a control signal therefrom called a stroke volume signal. The control signal is applied to the pulse generator so as to control the rate of stimulating pulses.
CA002027745A 1990-04-04 1990-10-16 Dual indifferent electrode Expired - Fee Related CA2027745C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/503,991 1990-04-04
US07/503,991 US5036849A (en) 1990-04-04 1990-04-04 Variable rate cardiac pacer

Publications (2)

Publication Number Publication Date
CA2027745A1 true CA2027745A1 (en) 1991-10-05
CA2027745C CA2027745C (en) 1998-07-07

Family

ID=24004398

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002027745A Expired - Fee Related CA2027745C (en) 1990-04-04 1990-10-16 Dual indifferent electrode

Country Status (5)

Country Link
US (1) US5036849A (en)
EP (1) EP0450229B1 (en)
JP (1) JP2729104B2 (en)
CA (1) CA2027745C (en)
DE (1) DE69022029T2 (en)

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* Cited by examiner, † Cited by third party
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DE69022029D1 (en) 1995-10-05
EP0450229A3 (en) 1992-07-08
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CA2027745C (en) 1998-07-07
US5036849A (en) 1991-08-06
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EP0450229B1 (en) 1995-08-30
JP2729104B2 (en) 1998-03-18

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