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United States Patent | 5,584,866 |
Kroll ,   et al. | December 17, 1996 |
An electrical method and apparatus for stimulating cardiac cells causing contraction to force hemodynamic output during fibrillation, hemodynamically compromising tachycardia, or asystole. High level electrical fields are applied to the heart to give cardiac output on an emergency basis until the arrhythmia ceases or other intervention takes place. The device is used as a stand alone external or internal device, or as a backup to an ICD, atrial defibrillator, or an anti-tachycardia pacemaker. The method and apparatus maintain some cardiac output and not necessarily defibrillation.
Inventors: | Kroll; Kai (Minnetonka, MN); Kroll; Mark W. (Minnetonka, MN) |
Assignee: | Galvani, Ltd. (Eden Prairie, MN) |
Appl. No.: | 543001 |
Filed: | October 13, 1995 |
Intern'l Class: | A61N 001/39 |
Field of Search: | 607/4-7,9-10,14 |
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__________________________________________________________________________ Percentage Status of Percentage Forcing Original of the the of the Percentage Cardiac status of cardiac cardiac original of the total Mechanical Output the cells cells cells status cells Action Effect __________________________________________________________________________ (A) 50% Diastolic 40% 20% will start to positive Diastolic non- of 50% contract on (+) captured own (B) Diastolic 60% 30% contract positive Diastolic captured of 50% (++) (C) 50% Systolic 80% 40% will start to negative Systolic non- of 50% relax on (-) captured own (D) Systolic 20% of 10% hold neutral Systolic captured 50% (0) Total 100% 100% 100% more positive contraction (++) __________________________________________________________________________
______________________________________ Status of the Cardiac Change in Description of Row Cells Output Activity ______________________________________ A Diastolic +5% Positive. Some cells non-captured will begin to contract on their own. B Diastolic captured +30% Positive. Cells contract due to forcing field. C Systolic -5% Negative. Some non-captured cells will begin to relax on their own. D Systolic captured 0% Neutral. Cells hold contraction due to forcing field. Net +30% A net gain cardiac Gain output due to forcing fields. ______________________________________