Abstract: The invention relates to a suction device for medical purposes with one or more side apertures and with a valve which responds to a vacuum. The invention is characterised in that the side apertures are covered by film halves which overlap in the middle, one of said halves being made from highly elastic thin material while the other is made from a stiff inflexible material and covers the flexible film in the overlap region. The side apertures can also take the form of elongated apertures. An advantage of this embodiment is the low damage to tissue when used in the overpressure area especially in minimally invasive surgical applications.

Abstract: The invention relates to a suction device for medical use, in which an aspirator (1) as illustrated in FIG. 1 is proposed, which has one or a plurality of side openings (3), and which is provided with a valve (4) which responds to underpressure.

Abstract: In a striking tool for surgical instruments with a sleeve-shaped gripping part, a tool holder which is slidingly displaceable in the latter in the longitudinal direction thereof, and an oscillatingly driven piston which is slidingly displaceable in the gripping part in the longitudinal direction thereof and has two striking surfaces which strike corresponding contact surfaces of the tool holder and thereby act upon the latter with impulses acting in opposite directions, to enable selective generation of blows in the striking direction and in the pulling-out direction without converting the tool, it is proposed that the actual stroke of the piston in the gripping part be limited such that is it smaller than the double-strike stroke which the piston would have to cover, with the tool holder held firmly in the gripping part, from the striking of the first striking surface against the contact surface to the striking of the second striking surface against the second contact surface, and that the tool holder be mou

Abstract: The method for monitoring the end positions of a controlling element having a servomotor (1) comprises the recognition of the end position, for instance by interruption of the flow of current to the servomotor by limit switches (4, 5), and the subsequent action of a control pulse of opposite direction on the servomotor in order to brake the servomotor.

Abstract: In the method for adjusting a controlling element, a marking point which can be recognized by the controller unit which controls the controlling element and is at a given distance from the adjustment point is selected in the vicinity of the desired adjustment point, said distance corresponding to a given number of control pulses which are necessary in order to adjust the controlling element with close tolerances to the desired adjustment point. When a switch is used as the marking point, the distance should be so great that after movement beyond this marking point the switch passes into a precisely defined switch condition.