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One embodiment of the present invention provides an implantable cardioverter-defibrillator for subcutaneous positioning between the third rib and the twelfth rib within a patient, the implantable cardioverter-defibrillator including a housing including a first electrode; a telescoping lead assembly

One embodiment of the present invention provides an implantable cardioverter-defibrillator for subcutaneous positioning between the third rib and the twelfth rib within a patient, the implantable cardioverter-defibrillator including a housing including a first electrode; a telescoping lead assembly including a second electrode, wherein the telescoping lead assembly is electrically and mechanically coupled to the housing; and an electrical circuit located within and electrically coupled to the housing.

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What is claimed is: 1. An implantable cardioverter-defibrillator comprising: a means for housing cardioversion-defibrillation circuitry, wherein the means for housing includes a first surface and a second surface and a left and a right overhang portion connected to the first surface, and at least a

What is claimed is: 1. An implantable cardioverter-defibrillator comprising: a means for housing cardioversion-defibrillation circuitry, wherein the means for housing includes a first surface and a second surface and a left and a right overhang portion connected to the first surface, and at least a portion of the means for housing is electrically insulated; wherein the cardioversion-defibrillation circuitry can provide an anti-arrhythmia waveform; an electrically conductive surface disposed upon a portion of the means for housing, wherein the electrically conductive surface couples to the cardioversion-defibrillation circuitry; and a lead assembly adjustably disposed on and electrically coupled to the first surface of the means for housing, wherein the first surface of the means for housing and the lead assembly are configured such that the position of the lead assembly can vary along substantially all of the first surface of the means for housing between the left and the right overhang portions. 2. The implantable cardioverter-defibrillator of claim 1, wherein the means for housing and the lead assembly are substantially curved in shape. 3. The implantable cardioverter-defibrillator of claim 1, wherein the means for housing and the lead assembly each further comprises one or more connector means; wherein at least one connector means on the means for housing is electrically coupled to the cardioversion-defibrillation circuitry; and wherein at least one connector means on the means for housing is electrically and mechanically coupled to at least one connector means on the lead assembly. 4. The implantable cardioverter-defibrillator of claim 3, wherein each of the one or more connector means further comprises a set screw for securing the lead assembly. 5. The implantable cardioverter-defibrillator of claim 1, wherein the lead assembly is a pacing lead. 6. The implantable cardioverter-defibrillator of claim 1, wherein the lead assembly is a shocking lead. 7. The implantable cardioverter-defibrillator of claim 1, wherein the lead assembly is a sensory lead. 8. The implantable cardioverter-defibrillator of claim 1, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the third and fifth ribs. 9. The implantable cardioverter-defibrillator of claim 1, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the fourth and sixth ribs. 10. The implantable cardioverter-defibrillator of claim 1, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the sixth and eighth ribs. 11. The implantable cardioverter-defibrillator of claim 1, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the eighth and tenth ribs. 12. The implantable cardioverter-defibrillator claim 1, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the tenth and twelfth ribs. 13. The implantable cardioverter-defibrillator of claim 1, wherein the implantable cardioverter-defibrillator provides anti-bradycardia pacing energy to the heart for treatment of atrial fibrillation. 14. The implantable cardioverter-defibrillator of claim 1, wherein the implantable cardioverter-defibrillator provides anti-bradycardia pacing energy to the heart for treatment of ventricular fibrillation. 15. The implantable cardioverter-defibrillator of claim 1, wherein the length of the means for housing is approximately 2 centimeters to approximately 40 centimeters. 16. The implantable cardioverter-defibrillator of claim 1, wherein the width of the means for housing is approximately 0.1 centimeters to approximately 25 centimeters. 17. The implantable cardioverter-defibrillator of claim 1, wherein the length the lead assembly is approximately 2 centimeters to approximately 55 centimeters. 18. The implantable cardioverter-defibrillator of claim 1, wherein the width the lead assembly is approximately 0.05 centimeters to approximately 8 centimeters. 19. An implantable cardioverter-defibrillator comprising: a housing having a first surface and a second surface and a left and a right overhang portion connected to the first surface, wherein at least a portion of the housing is electrically insulated, the housing having one or more connector blocks; a cardioversion-defibrillation circuitry sealed within the housing, wherein the cardioversion-defibrillation circuitry can provide an anti-arrhythmia waveform; an electrically conductive surface disposed upon a portion of the housing, wherein the electrically conductive surface couples to the cardioversion-defibrillation circuitry; and a lead assembly adjustably disposed on and electrically coupled to the first surface of the housing, and is disposed between the left and the right overhang portions of the housing, the lead assembly including one or more connector blocks; wherein the first surface of the housing and the lead assembly are configured such that the position of the lead assembly can vary along substantially all of the first surface of the housing; wherein at least one connector block on the housing is electrically coupled to the cardioversion-defibrillation circuitry; and wherein at least one connector block on the housing is electrically and mechanically coupled to at least one connector block on the lead assembly. 20. The implantable cardioverter-defibrillator of claim 19, wherein the housing and the lead assembly are substantially curved in shape. 21. The implantable cardioverter-defibrillator of claim 19, wherein each of the one or more connector blocks further comprises a set screw for securing the lead assembly. 22. The implantable cardioverter-defibrillator of claim 19, wherein the electrical circuit can provide a cardioversion-defibrillation energy to the patient's heart. 23. The implantable cardioverter-defibrillator of claim 19, wherein the electrical circuit can further provide multiphasic waveform cardiac pacing for the patient's heart. 24. The implantable cardioverter-defibrillator of claim 19, wherein the electrical circuit can provide biphasic waveform cardiac pacing forte patient's heart. 25. The implantable cardioverter-defibrillator of claim 19, wherein the electrical circuit can provide triphasic waveform cardiac pacing for the patient's heart. 26. The implantable cardioverter-defibrillator of claim 19, wherein the electrical circuit can provide a monophasic waveform cardiac pacing for the patient's heart. 27. The implantable cardioverter-defibrillator of claim 19, wherein the lead assembly is a pacing lead. 28. The implantable cardioverter-defibrillator of claim 19, wherein the lead assembly is a shocking lead. 29. The implantable cardioverter-defibrillator of claim 19, wherein the lead assembly is a sensory lead. 30. The implantable cardioverter-defibrillator of claim 19, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the third and fifth ribs. 31. The implantable cardioverter-defibrillator of claim 19, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the fourth and sixth ribs. 32. The implantable cardioverter-defibrillator of claim 19, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the sixth and eighth ribs. 33. The implantable cardioverter-defibrillator of claim 19, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the eighth and tenth ribs. 34. The implantable cardioverter-defibrillator claim 19, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the tenth and twelfth ribs. 35. The implantable cardioverter-defibrillator of claim 19, wherein the implantable cardioverter-defibrillator provides anti-tachycardia pacing energy to the heart for treatment of atrial fibrillation. 36. The implantable cardioverter-defibrillator of claim 19, wherein the implantable cardioverter-defibrillator provides anti-tachycardia pacing energy to the heart for treatment of ventricular tachycardia. 37. The implantable cardioverter-defibrillator of claim 19, wherein the length of the housing is approximately 2 centimeters to approximately 40 centimeters. 38. The implantable cardioverter-defibrillator of claim 19, wherein the width of the housing is approximately 0.1 centimeters to approximately 25 centimeters. 39. The implantable cardioverter-defibrillator of claim 19, wherein the length the lead assembly is approximately 2 centimeters to approximately 55 centimeters. 40. The implantable cardioverter-defibrillator of claim 19, wherein the width the lead assembly is approximately 0.05 centimeters to approximately 8 centimeters. 41. An implantable cardioverter-defibrillator for subcutaneous positioning between the third rib and the twelfth rib within a patient, the implantable cardioverter-defibrillator comprising: a housing including a first electrode, the housing having a first surface and a second surface, and left and right overhang portions connected to the first surface; a telescoping lead assembly including a second electrode, wherein the telescoping lead assembly is electrically and mechanically coupled to the housing; and an electrical circuit located within and electrically coupled to the housing; wherein the telescoping lead assembly is selectively disposed next to the first surface and between the left and the right overhang portions of the housing, wherein the position of the telescoping lead assembly can vary along pre-set positions on the housing. 42. The implantable cardioverter-defibrillator of claim 41, wherein the housing and the telescoping lead assembly are substantially curved in shape. 43. The implantable cardioverter-defibrillator of claim 41, wherein the housing and the telescoping lead assembly each further comprises one or more connector blocks; wherein at least one connector block on the housing is electrically coupled to the electrical circuit; and wherein at least one connector block on the housing is electrically and mechanically coupled to at least one connector block on the telescoping lead assembly. 44. The implantable cardioverter-defibrillator of claim 43, wherein each of the one or more connector blocks further comprises a set screw for securing the telescoping lead assembly. 45. The implantable cardioverter-defibrillator of claim 41, wherein the electrical circuit can provide a cardioversion-defibrillation energy to the patient's heart. 46. The implantable cardioverter-defibrillator of claim 41, wherein to electrical circuit can further provide multiphasic waveform cardiac pacing for the patient's heart. 47. The implantable cardioverter-defibrillator of claim 41, wherein the electrical circuit can provide triphasic waveform cardiac pacing for the patient's heart. 48. The implantable cardioverter-defibrillator of claim 41, wherein the electrical circuit can provide triphasic waveform cardiac pacing for the patient's heart. 49. The implantable cardioverter-defibrillator of claim 41, wherein the electrical circuit can provide a monophasic waveform cardiac pacing for the patient's heart. 50. The implantable cardioverter-defibrillator of claim 41, wherein the telescoping lead assembly is a pacing lead. 51. The implantable cardioverter-defibrillator of claim 41, wherein the telescoping lead assembly is a shocking lead. 52. The implantable cardioverter-defibrillator of claim 41, wherein the telescoping lead assembly is a sensory lead. 53. The implantable cardioverter-defibrillator of claim 41, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the third and fifth ribs. 54. The implantable cardioverter-defibrillator of claim 41, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the fourth and sixth ribs. 55. The implantable cardioverter-defibrillator of claim 41, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the sixth and eighth ribs. 56. The implantable cardioverter-defibrillator of claim 41, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the eighth and tenth ribs. 57. The implantable cardioverter-defibrillator claim 41, wherein the implantable cardioverter-defibrillator is positioned subcutaneously between the tenth and twelfth ribs. 58. The implantable cardioverter-defibrillator of claim 41, wherein the implantable cardioverter-defibrillator provides anti-tachycardia pacing energy to the heart for treatment of atrial fibrillation. 59. The method of claim 41, wherein the implantable cardioverter-defibrillator provides anti-tachycardia pacing energy to the heart for treatment of ventricular tachycardia.