Dornier System Gmbh

Dornier Medizintechnik Gmbh

Gerold Heine

Othmar Wess

Wolfgang Hepp

Joachim Stark

Bernd Forssmann

Hendrik Zech

Gustav Sell

Ernst Marlinghaus

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.

Device for ensuring the proper positioning of electrodes in a

A mold or parts of the mold are removed from a casting following solidification and cooling by immersing the casting with mold or mold particles still attached in a liquid such as oil or water and focusing shock waves onto interface portions to obtain ablation and spalling of the mold material to be removed from the casting.

Removing a casting from a mold

A shock wave sensor is disclosed in which a piezoelectric foil is either suspended in a ring or on a backing. Electrodes run from a particular sensitive area on the foil towards the edges and are fracture proof connected to concentric conductors.

Shock wave sensor

A generator for pulse trains of shockwaves for the purpose of contactlessly comminuting concretions in living bodies, comprising a shockwave source, for instance a spark gap, a focusing reflector, for instance a hollow ellipsoid filled with a propagation medium, and a layer of a material having an impedance different from that of the medium of propagation mounted in such a manner that it is crossed by the shockwave field.

Generator for a pulse train of shockwaves

In extracorporal lithotripsy a shock wave that is focussed on a concrement is followed by a pain producing pressure wave. This wave is filtered by means of a membrane bulging inwardly into the focussing chamber, closing the same and having a thickness smaller than the predominant wave length of the shock wave.

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Uhldingen-Muehlhofen, Germany

Gerold Heine