Microsecond tandem-pulse electrohydraulic shock wave generator w

Details Microsecond tandem-pulse electrohydraulic shock wave generator w Microsecond tandem-pulse electrohydraulic shock wave generator w

1995-12-14

1998-09-01

Caster, Brian L.

Surgery: kinesitherapy

Kinesitherapy

Contact-free comminution of concretion

A61B 1722

Patent

active

058003657

ABSTRACT:
The invention discloses a microsecond tandem-pulse electrohydraulic shock wave generator for the comminution of concretions in vivo by controlled, concentrated cavitation energy. This apparatus generates a primary and a secondary shock wave pulse with a specified time delay in microseconds and pressure relationships, with the primary shock wave pulse being used to induce a transient cavitation bubble cluster near the target concretion, and the secondary shock wave pulse consisting of a sequence of reflected pulses producing a pulse that is substantially compressive to control and force the collapse of the cavitation bubble cluster towards the target concretion. This microsecond tandem-pulse is produced by the use of a plurality of ellipsoidal reflecting surfaces of the same focal length, but different major and minor axes. These two microsecond shock wave pulses, one having a compressive and a tensile component and one having essentially only a compressive component have been found to give concentrated energy deposition on the target concretion, while avoiding injury to surrounding tissue caused by random collapse of the cavitation bubbles, thus enhancing the efficiency of fragmentation of the concretion using shock waves while reducing potential deleterious injury to surrounding tissue.

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