Shock wave source for generating a short initial pressure pulse

Details Shock wave source for generating a short initial pressure pulse Shock wave source for generating a short initial pressure pulse

1987-10-06

1989-11-14

Smith, Ruth S.

Surgery

Truss

Perineal

128328, 12866003, A61B 1722

Patent

active

048799939

ABSTRACT:
A shock wave source has a coil carrier, a planar or concave coil, a membrane consisting of electrically conductive material and a foil consisting of electrically non-conductive material. The membrane is disposed between the coil and the foil so as to be held tightly therebetween but having a perimeter which is capable of substantially unrestrained movement. Upon the application of a high voltage pulse to the coil, the resulting field causes the membrane to be rapidly repelled, however, only the mechanical forces of the membrane act on the foil, with no electromagnetic forces generated by the coil acting on the foil. The resulting pressure pulse is intensified to form a shock wave pulse in a transmission medium adjacent to the foil. The substantially unrestrained perimeter of the membrane disposed between the coil and the foil permits an initial pressure pulse of short duration to be generated, which provides the further advantages of a short approach path, a small focus zone, a high focusing factor, low electrical and thermal stress on the shock wave source and a low acoustic energy output into the body of a patient receiving treatment using the shock wave source.

REFERENCES:
patent: 4617931 (1986-10-01), Dory
patent: 4660186 (1987-04-01), Massa
patent: 4669472 (1987-06-01), Eisenmenger
patent: 4697579 (1987-10-01), Wessels et al.
patent: 4766888 (1988-08-01), Oppelt
patent: 4793329 (1988-12-01), Mahler et al.
patent: 4794914 (1989-01-01), Mahler et al.

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