Surgery – Truss – Perineal
Patent
1990-08-28
1992-05-12
Howell, Kyle L.
Surgery
Truss
Perineal
310311, 310313, 310334, 310335, 367157, 367165, 367171, 367173, A61B 1722, H01L 4108, H04R 1700
Patent
active
051118050
ABSTRACT:
There is disclosed, a piezoelectric transducer for generating focussed ultrasonic shock waves for use in lithotripsy. The ultrasonic shock waves are emitted in pulsed form and can be transmitted by way of a coupling medium to the body of a patient to be treated. The transducer comprises a substantial member of individual piezoelectric transducer elements of ceramic or like material which are connected to the poles of a pulse generator and are fixed to a support in mosaic form and with their sides electrically insulated from one another. The acoustic termination of the transducer elements is essentially free from reflection. An intermediate medium of at least one layer, the acoustic impedance of which lies between that of the ceramic of the transducer element and that of the coupling medium, is provided between the transducer elements and the coupling medium. The thickness d of the layer is chosen in accordance with the relationship d>.tau..sub.k .multidot.c.sub.LA, where .tau..sub.k is the propagation time of sound in the piezoceramic of the transducer elements and c.sub.LA is the sound velocity in the intermediate medium.
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Jaggy Peter
Krauss Werner
Schafer Dagobert
Wurster Helmut
Howell Kyle L.
Pfaffle Krista M.
Richard Wolf GmbH
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