Method and device for removing concretions within human ducts

Details Method and device for removing concretions within human ducts Method and device for removing concretions within human ducts

1992-05-22

1993-10-19

Pellegrino, Stephen C.

Surgery

Instruments

Means for concretion removal

606127, 606108, 606 29, 606 48, 606 50, A61B 1722

Patent

active

052541215

ABSTRACT:
A method and device is described for removing concretions such as calculus stones within human ducts such as the ureter or kidney. The device includes a flexible probe insertable through the human duct so that a tip thereof is juxtaposed against the concretion. The probe includes a positive electrode extending coaxially within the conduit and embedded in a solid electrically insulative material. A negative electrode is coextensive with and outwardly encircles the positive electrode. The solid electrically insulative material stops short by a distance R from the end of the probe, thereby leaving a recess without solid insulation between negative and positive electrodes at the tip end of the probe. The recess achieves a more efficient fragmentation of target calculi at lower energy, with less human tissue damage and increase in useful probe life.

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Krishna Bhatta et al, Effects of Shielded or Unshielded Lasar and Electrohydraulic Lithotripsy on Rabbit Bladder, Apr. 1990, vol. 143 pp. 857-860.

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