Surgery – Truss – Pad
Patent
1990-11-14
1992-06-02
Kamm, William E.
Surgery
Truss
Pad
128419PG, A61N 139
Patent
active
051178249
ABSTRACT:
An implantable cardiac pacemaker and/or cardioverter/defibrillator employing an R-wave detector which atuomatically adjusts its sensing threshold in response to R-wave amplitude. The R-wave detector produces an output which is used to indicate the occurrence of ventricular contractions, and is used to reset the timing of the pacemaker and to indicate the occurrence of ventricular contractions for purposes of activating the associated cardioverter/defibrillator. Adjustment of the threshold is disable for a predetermined period following the delivery of each pacing pulse such that in the presence of continuous pacing for a predetermined period of time, the sensing threshold is returned to a desired, lower threshold level, allowing for detection of lower level R-waves, which may be indicative of tachyarrhythmia or fibrillation. The R-wave detector disclosed also eliminates the necessity for blanking of the input of the sense amplifier following sensing of naturally occurring R-waves, without increasing susceptibility to sensing of spontaneous T-waves which occur thereafter.
REFERENCES:
patent: 4819643 (1989-04-01), Menken
patent: 4974589 (1990-12-01), Sholder
patent: 5048521 (1991-09-01), Pless et al.
"Reliable R-Wave Detection from Ambulatory Subjects" by Nitish V. Thakor, Biomed Sci Instrum 14:67-72, 1978.
"Design of Microcomputer-Based Medical Instrumetation" by W. J. Tompkins & John G. Webster, Editors Prentice-Hall, 1981 pp. 413-415.
Ballis Joseph A.
Keimel John G.
Roline Glenn M.
Duthler Reed A.
Getzow Scott M.
Kamm William E.
Medtronic Inc.
Patton Harold R.
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