Injectable subcutaneous heart device (ISHD) (480, 550) for regulating arrhythmias in a heart of a patient, comprising: a plurality of linked structures, each one of said linked structures being hollow; an interconnecting bus, for electrically coupling said plurality of linked structures; a biocompatible coating, for hermetically sealing and electrically insulating said plurality of linked structures; at least two electrodes; and a plurality of sensors, wherein a first one of said plurality of linked structures encapsulates a power source; wherein a second one of said plurality of linked structures encapsulates at least one capacitor; wherein a third one of said plurality of linked structures encapsulates electronics; wherein said at least two electrodes are respectively placed on an outer surface of at least two different ones of said plurality of linked structures located at opposite ends of said ISHD, for providing electrical shocks to said heart for regulating said arrhythmias; wherein at least two of said plurality of sensors are located on an outer surface at opposite ends of said ISHD, for detecting said arrhythmias in said heart; wherein said at least two electrodes and said plurality of sensors are electrically coupled with said interconnecting bus; wherein said power source provides power to said electronics and provides electrical energy to said at least one capacitor; and wherein said at least one capacitor stores electrical energy and discharges said electrical energy to said at least two electrodes when an arrhythmia is detected in said heart, said ISSHD is positionable subcutaneously around said heart; said plurality of linked structures provides said ISHD flexibility in at least three directions; said ISHD having a substantially symmetric cross-section such that the ISHD is indifferent to its roll position; a significant portion of said ISHD being positionable in an abdominal region of said patient; characterized in that said plurality of sensors forming at least two sensor pairs; and said at least two sensor pairs being usable for reducing false positives in detecting said arrhythmias in said heart. a plurality of linked structures, each one of said linked structures being hollow; an interconnecting bus, for electrically coupling said plurality of linked structures; a biocompatible coating, for hermetically sealing and electrically insulating said plurality of linked structures; at least two electrodes; and a plurality of sensors, wherein a first one of said plurality of linked structures encapsulates a power source; wherein a second one of said plurality of linked structures encapsulates at least one capacitor; wherein a third one of said plurality of linked structures encapsulates electronics; wherein said at least two electrodes are respectively placed on an outer surface of at least two different ones of said plurality of linked structures located at opposite ends of said ISHD, for providing electrical shocks to said heart for regulating said arrhythmias; wherein at least two of said plurality of sensors are located on an outer surface at opposite ends of said ISHD, for detecting said arrhythmias in said heart; wherein said at least two electrodes and said plurality of sensors are electrically coupled with said interconnecting bus; wherein said power source provides power to said electronics and provides electrical energy to said at least one capacitor; and wherein said at least one capacitor stores electrical energy and discharges said electrical energy to said at least two electrodes when an arrhythmia is detected in said heart, said ISSHD is positionable subcutaneously around said heart; said plurality of linked structures provides said ISHD flexibility in at least three directions; said ISHD having a substantially symmetric cross-section such that the ISHD is indifferent to its roll position; a significant portion of said ISHD being positionable in an abdominal region of said patient; characterized in that said plurality of sensors forming at least two sensor pairs; and said at least two sensor pairs being usable for reducing false positives in detecting said arrhythmias in said heart.