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Jakoubek Medizintechnik Gmbh

Dmv-Medizintecknik Gmbh

Dey, Uwe and Mueller, Bernd

Torsten Thiel

Bernd Muller

Uwe Dey

Peter Hartwig

A switch-over device which is useful for a gas insufflation device using liquid gas includes at least two inflow channels each blockable by a valve and at least one outflow channel for alternate removal of a fluid medium from a plurality of containers. The device has a switch-over piston movably mounted in a housing and comprising a base member which has at each end a valve closure member in a form of a body of rotation. The switch-over piston is driven by a pressure difference between the fluid media and connects one of the inflow channels to the outflow channel in each of two switching positions. A working chamber accommodates the switch-over piston, with sealing elements being provided for closing off the inflow channels in a pressure tight manner when the switch-over piston is in the correspondingly closed position and for dividing the working chamber into two portions sealed off from each other. The switch-over piston and/or the working chamber is constructed so that at least one sealing element can be arranged selectively in different positions. The size of the areas of the switch-over piston which are acted upon by the fluid media and determined the switch-over point is determined by the position of the sealing element.

Switch-over device

Process for maintaining the cleanliness of the inner cavity of a medical operating instrument (I), particularly a surgical instrument used in minimally invasive medicine, having an outer casing (M) and operating or actuating elements (SS, SH) arranged therein, said instrument being used to enter the body of a living person or animal, wherein during its use the instrument is acted upon essentially from its proximal end through a fluid connection (A) with a medically clean fluid (G) in such a way that essentially all the crevices and cavities in the inner space, in fluid contact with the inside of the body, between the operating or actuating elements (SS, SH) or between the latter and the casing (M) are filled with the fluid.

Process for maintaining the sterility of a medical instrument

Process for introducing a fluid into a cavity or a blood vessel of a human or animal body, particularly for gas insufflation in preparation for or during a minimally invasive surgical procedure or investigation of the body cavity or blood vessel, the fluid being conveyed from a pressurised gas store (11,12) through a fluid supply line (4) and an introduction instrument (T) of a fluid introduction system (1) into the body cavity or blood vessel and the internal pressure produced in the body cavity or blood vessel being determined from the insufflation pressure measured at a measuring point in the fluid introduction system and a correction magnitude reflecting the drop in pressure between the measuring point and the body cavity or blood vessel, wherein the internal pressure is determined substantially without interrupting the introduction of fluid from substantially continuously detected measurements of the insufflation pressure and the fluid volume introduced per unit of time (fluid flow), the gas flow yielding the correction magnitude on the basis of a predetermined non-linear characteristic which reflects the functional correlation between the fluid flow and the fall in pressure in the fluid introduction system.

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Furstenwalde, Germany

Torsten Thiel