Surgery – Truss – Perineal
Patent
1990-07-26
1991-10-22
Cohen, Lee S.
Surgery
Truss
Perineal
12866003, A61B 1722
Patent
active
050585690
ABSTRACT:
An apparatus for generating focused shockwaves, suitable for extracorporeal lithotripsy, has a substantially hollow-cylindrical membrane consisting of electrically conductive material and an electrical coil arrangement disposed inside the membrane which can be supplied with a high voltage pulse to rapidly repel the membrane and thereby generate a shockwave. The apparatus includes a concave reflector in the form of a paraboloid of revolution, which surrounds the membrane and coil, and which has a center axis substantially coincident with the center axis of the membrane. An acoustic propagation medium fills at least the volume between the membrane and the reflector. The shockwave generated by the cylindrical coil and membrane arrangement is reflected and focused by the paraboloid of revolution so that the shockwaves converge at a focus. The apparatus is arranged so that the focus conicides with a region of a patient to be treated with shockwave therapy, such as a calculus. The coil is wound in the shape of a cylindrical helix, and the membrane is in the form of a thin-walled, smooth tube.
REFERENCES:
patent: 4669472 (1987-06-01), Eisenmenger
patent: 4674505 (1987-06-01), Pauli et al.
patent: 4697588 (1987-10-01), Reichenberger
patent: 4901709 (1990-02-01), Rattner
patent: 4915114 (1990-04-01), Hassler
Hassler Dietrich
Reichenberger Helmut
Schmidt Erhard
Schwark Hubert
Cohen Lee S.
Pfaffle Krista M.
Siemens Aktiengesellschaft
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