Surgery – Truss – Pad
Patent
1989-06-06
1990-08-07
Jaworski, Francis
Surgery
Truss
Pad
A61N 100
Patent
active
049459090
ABSTRACT:
A pacemaker is disclosed with a pacing rate that is restricted within a range defined by variable upper and lower rate limits that change as a function of the patient's detected level of activity. An indication such as the nonambient temperature of blood is sensed in the right ventricle of the heart to indicate detected activity level. Other activity indications, such as blood oxygen concentration and body motion, either singly or in combination are also disclosed. A control circuit of the pacemaker varies the upper and lower rate limits according to the patient's detected level of activity. The control circuit also varies the atrial and ventricular refractory periods along with the AV delay period in response to detected activity level changes.
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Fearnot, NE, et al., "Principles of Exercise Responsive Pacemakers," IEEE Engineering in Medicine & Biology, Jun. 1984, pp. 25-29.
Berstein, et al., "Pacing Mode Codes," Modern Cardiac Pacing, Futura Publishing Co., Mount Kisco, N.Y. 1985, Chapter 13, pp. 307-322.
Fearnot Neal E.
Heggs Kevin S.
Johnson William L.
Stevens Donald A.
Cook Pacemaker Corporation
Godlewski Richard J.
Jaworski Francis
Manuel George
Medical Engineering & Development Institute, Inc.
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