Surgery – Truss – Pad
Patent
1991-05-20
1991-12-31
Smith, Ruth S.
Surgery
Truss
Pad
128 24EL, A61B 1722
Patent
active
050762770
ABSTRACT:
A calculus destroying apparatus includes piezoelectric elements constituted by arranging a plurality of piezoelectric elements to have a predetermined shape, thereby constituting a shock wave generating source, a first driver for driving the piezoelectric elements by a high voltage pulse so that a shock wave for calculus destruction having a predetermined focal point pressure distribution is generated from the piezoelectric elements, a second driver for driving at least some of the piezolectric elements by a low voltage pulse so that a low pressure ultrasonic wave having a lower pressure and a wider focal point pressure distribution than those of the shock wave is generalized from the piezoelectric elements, a receiver for receiving an echo of the low pressure ultrsonic wave from inside a patient's body via the piezoelectric elements, and a controller for activating the second driver prior to activation of the first driver, and activating the first driver when the intensity of the echo received by the receiver exceeds a predetermined threshold value.
REFERENCES:
patent: 4537074 (1985-08-01), Dietz
patent: 4771787 (1986-12-01), Wurster et al.
patent: 4803995 (1987-06-01), Ishida et al.
patent: 4858597 (1989-08-01), Kurtze et al.
patent: 4888746 (1989-12-01), Wurster et al.
Aida Satoshi
Iwama Nobuyuki
Kabushiki Kaisha Toshiba
Smith Ruth S.
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