Device for ensuring the proper positioning of electrodes in a li

Details Device for ensuring the proper positioning of electrodes in a li Device for ensuring the proper positioning of electrodes in a li

1988-10-21

1990-07-10

Smith, Ruth S.

Surgery

Truss

Perineal

606128, 340686, A61B 1722

Patent

active

049400509

ABSTRACT:
In an arrangement for the generation and focussing of shock waves for purposes of comminution of concrements, wherein the generation is provided by a pair of electrodes, and the focussing is provided by a rotational ellipsoid; the electrodes extend from a sleeve being inserted in the body of the ellipsoid such that the electrodes center on one of the two focal points of the rotational ellipsoid; a positioning device for the electrodes includes a position indicator on the electrode sleeve such as a metal or optical marking on a mechanical actuator having a highly accurately predetermined positional relation to the electrodes; a position sensor on the body of the rotational ellipsoid has a highly accurately determined position in relation to the first focal point; and a circuit is connected to the position sensor to provide a audible and/or visible representation if, and only if, the position indicator has an accurate position related to the sensor as an indication that the electrodes are centered on the first focal point.

REFERENCES:
patent: 3896280 (1975-07-01), Blake
patent: 3986165 (1976-10-01), MacIntyre
patent: 4162491 (1979-07-01), Gochis
patent: 4296410 (1981-10-01), Higgs et al.
patent: 4608983 (1986-09-01), Muller et al.
patent: 4662375 (1987-05-01), Hepp et al.
patent: 4669465 (1987-06-01), Moore et al.

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