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4,030,509 A 6/1977 Heilman et al. LLC 4,157,720 A 6/1979 Greatbatch 4,164,946 A 8/1979 Langer(57) ABSTRACT 4,184,493 A 1/1980 Langer et al. 4,210,149 A 7/1980 Heilman et al. Asubcutaneous implantable cardioverter-de? brillator is dis RE30, 387 E 8/1980 Denniston, III et al. closed Which has an electrically active canister Which houses 4,223,678 A 9/1980 Lander et al- a source of electrical energy, a capacitor, and operational 4,254,775 A 3/1981 LaPgeT circuitry that senses the presence of potentially fatal heart 4,291,707 A 9/1981 Hellmfm et a1 ‘ rhythms. At least one subcutaneous electrode that serves as 4300567 A 11/1981 Kolemk et a1 ‘ the o osite electrode from the canister is attached to the