Non-invasive destruction of kidney stones
Patent 4620545 Issued on November 4, 1986. Estimated Expiration Date: 
October 31, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 31, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesApparatus for breaking-up, without contact, concrements present in the body of a living being Apparatus for contact-free disintegration of kidney stones or other calculi Injury-free coupling and decoupling of therapeutic shock waves Patent #: 4539989 InventorsAssigneeApplicationNo. 06/666770 filed on 10/31/1984US Classes:601/4Contact-free comminution of concretionExaminersPrimary: Crowder, Clifford D.Attorney, Agent or FirmInternational ClassesA61B 17/22 (20060101)G10K 11/00 (20060101) G10K 11/28 (20060101) AbstractApparatus for the non-invasive disintegration of kidney stones and the like. An ellipsoidal reflector open at one end is positionable against the body, and may have a diaphragm across the opened end to prevent leakage of water contained in the reflector. A spark gap is located at the first focal point of the ellipsoid, and sonic aiming means is physically interconnected with the ellipsoid for aiming the ellipsoid at the kidney stone or the like to locate the kidney stone at the second focal point of the ellipsoid. A series of sparks discharged across the spark gap generates a succession of shock waves that travel through water in the reflector, and through the body to impinge on the kidney stone or the like and thereby to disintegrate the same.Other References
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