Shock wave source with increased degree of effectiveness

Details Shock wave source with increased degree of effectiveness Shock wave source with increased degree of effectiveness

1987-03-26

1989-06-20

Smith, Ruth S.

Surgery

Truss

Perineal

128328, A61B 1722

Patent

active

048401668

ABSTRACT:
A shock wave source, especially useful for a lithotriptor, has a pressure source for the generation of a pressure wave impulse, a focusing device for focusing the pressure wave pulse, and a seal diaphragm for coupling the pressure wave pulse into the body of a patient, perhaps via a coupling body placed between the seal diaphragm and the patient. The seal diaphragm and the focusing device of the pressure source form a space which serves as a prepassage. The prepassage space is filled with a liquid substance which has a high B/A ratio and an acoustic impedance less than or equal to that of water. The advantage of this configuration is that the pressure wave pulse can be built up very rapidly in its course through the space. At a given point in the space, with the selection of the above-mentioned substances, as compared to water, a given minimum value of the quotient amplitude/build-up time of the pressure wave pulse can be achieved inspite of a reduced output amplitude at the pressure source. Consequently, the life expectancy of the pressure source is higher and less stress is placed on the patient by the acoustic energy. Thus, the degree of effectiveness of the lithotriptor is increased.

REFERENCES:
patent: 2559227 (1951-07-01), Rieber
patent: 4281550 (1981-08-01), Erikson
patent: 4608979 (1986-09-01), Breidenthal et al.
patent: 4669472 (1987-06-01), Eisenmenger
Journal of the Acoustical Society of America, No. 2, Feb. 1986, pp. 566-570; Entitled: "Ultrasonic Nonlinear Parameters and Sound Soeed of Alcohol-Water Mixtures".

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