Lithotrity apparatus using ultrasonic waves or shock waves for p

Details Lithotrity apparatus using ultrasonic waves or shock waves for p Lithotrity apparatus using ultrasonic waves or shock waves for p

1990-04-04

1992-01-07

Smith, Ruth S.

Surgery

Truss

Pad

128 24AA, 128 24EL, 128804, A61B 1722

Patent

active

050781430

ABSTRACT:
A shock wave lithotrity apparatus comprises an applicator which includes a first transducer for generating ultrasonic waves and for converging the ultrasonic waves on a focal point to treat an object, a second transducer for generating ultrasonic waves at a low level for echography, and a water bag for transmitting the ultrasonic waves to the object. A lithotrity unit and a B-mode imaging unit are respectively connected to the first and second transducers. When a position mode is selected, the second transducer is driven by the B-mode imaging unit and the echography is displayed and the first transducer is driven by the lithotrity unit at a low voltage to detect the intensity of the echo signal. The degree of focus-calculus matching is calculated based on the intensity. The operator adjusts the position of the first transducer by referring to the echography and the matching degree. The operation of a trigger switch is disabled in order to inhibit the drive of the first transducer at a high level in the positioning mode. In a lithotrity mode the first transducer is driven at the high level in order to generate the shock wave at the focus point upon the operation of the trigger switch.

REFERENCES:
patent: 4617931 (1986-10-01), Dory
patent: 4763652 (1988-08-01), Brisson et al.
patent: 4803995 (1989-02-01), Ishida et al.
patent: 4819621 (1989-04-01), Ueberle et al.
patent: 4829986 (1989-05-01), Eichler et al.
patent: 4834074 (1989-05-01), Reichenberger
patent: 4940050 (1990-07-01), Forssmann et al.
patent: 4958639 (1990-09-01), Uchiyama et al.

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