Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1993-11-22
1995-06-13
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 9, A61N 136
Patent
active
054238706
ABSTRACT:
A cardiac pacemaker having an automatic pulse rate response gain factor responsive to at least one cardiac-related physiological characteristic of a patient. The pacemaker includes a rate controller that comprises a detector for detecting a plurality of individual measurements of at least one physiological characteristic over each of a plurality of pre-determined time periods, with each of the individual measurements being an average of values detected over each of a respective multiple number of incremental time periods occurring within each of the pre-determined time periods. The pacemaker saves the highest measurement from one incremental time period of each of several consecutive pre-determined time periods, and these highest measurements are averaged. Thereafter, the rate controller adjusts the rate response gain factor or slope of the pulse rate in relation to the physiological characteristic measurement and a pre-determined target pulse rate. In a preferred embodiment, two physiological characteristics are measured, with high values averaged of only one characteristic when that characteristic exceeds a threshold level of the other characteristic. One embodiment is pulse rate responsive to minute volume measurement in combination with accelerometer measurement, with accelerometer measurement requiring a threshold value over an increment of time prior to minute volume recordation for input toward rate response gain factor.
REFERENCES:
patent: 4884576 (1989-12-01), Alt
patent: 4945909 (1990-08-01), Fearnot et al.
patent: 4966146 (1990-10-01), Webb et al.
patent: 5088488 (1992-02-01), Markowitz et al.
"One-Year Follow-Up of Automatic Adaptation of the Rate Response Algorithm of the QT Sensing Rate Adaptive Pacemaker" by M. W. Baig et al PACE, vol. 14, pp. 1598-1605.
Olive Arthur L.
Salo Rodney W.
Cardiac Pacemakers Inc.
Kamm William E.
Parker Marianne
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