Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1992-02-27
1994-02-08
Cohen, Lee S.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 100
Patent
active
052844919
ABSTRACT:
A pacemaker having a hysteresis feature which permits intrinsic heart activity, controlled by the sinus node to resume optimally after pacing. The pacemaker has a programmable lower rate and upper rate, a programmable lower hysteresis rate (LRH) corresponding to a lower rate hysteresis interval (LRHI), and a programmable rate (IR) intermediate an upper pacing rate (UR) and a lower pacing rate (LR). A microprocessor measures the average rate of change M.sub.AVG in the intervals between consecutive ventricular depolarizations, and compares the last intrinsic escape interval RR.sub.N to the lower rate hysteresis interval (LRHI).
If the last intrinsic escape interval RR.sub.N is longer than the lower rate hysteresis interval (LRHI), and if the value of M.sub.AVG is greater than a first preselected value SL.sub.1 but less than a second preselected value SL.sub.2, the pacemaker stimulates at the lower rate hysteresis (LRH) and thereafter gradually increases the pacing rate up to the intermediate rate (IR). A time counter maintains a continuous pacing at the intermediate rate (IR) for a predefined period of time, and the pacing rate is gradually decreased toward the lower pacing rate (LR).
REFERENCES:
patent: 3661157 (1972-05-01), Fyson et al.
patent: 3857399 (1974-12-01), Zacouto
patent: 3921642 (1975-11-01), Preston et al.
patent: 4169480 (1979-10-01), Digloy et al.
patent: 4363325 (1982-12-01), Roline et al.
patent: 4856523 (1989-08-01), Sholder et al.
patent: 4972834 (1990-11-01), Begemann et al.
"Dual Chamber Pacing Aborts Vasovagal Syncope Induced by Head-Up 60.degree. Tilt", Fitzpatrick et al. PACE, vol. 14, pp. 13-19.
Bourgeois Ivan
Sutton Richard
Cohen Lee S.
Gadson Gregory P.
Medtronic Inc.
Parker Marianne
Patton Harold R.
LandOfFree
Cardiac pacemaker with hysteresis behavior does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cardiac pacemaker with hysteresis behavior, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cardiac pacemaker with hysteresis behavior will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-694988