Abstract: A valve arrangement for stopping fluid passage through at least one flexible tubing is provided with a camshaft having at least one control cam which is designed as a sink in an otherwise closed circular surface of the camshaft for moving a press member which is retracted into an inactive relative position when radially aligned with the sink and which is protruded into an active relative position by the circular surface of the camshaft for then squeezing the associated portion of the flexible tube which is passed through a housing of the valve arrangement in a direction normal with respect to a longitudinal bore rotatably supporting the camshaft and also normal with respect to a radial bore which is arranged for radially guiding the press member.

Abstract: A nozzle piece for a handpiece of a dental abrasive blasting apparatus comprises a gripping member for connection with a head portion of the handpiece whereby the gripping member has a closed surface with a thusly defined curvature on its upper and underneath visual surfaces that discharge openings of two discharge nozzles of the nozzle piece are located close to a visual plane which by definition includes a longitudinal axis of the handpiece and outside of which are located the crossing points of two supply ducts with a common central axis of the two discharge nozzles, whereby the two supply ducts extend in parallel and inclined with respect to the longitudinal axis of the handpiece for defining an inclined discharge angle of a working jet of the nozzle piece.

Abstract: A powder reservoir for a dental abrasive blasting apparatus is provided with a discharge valve having a closure body that comprises associated driving means for moving a closure body with a pulsed frequency alternately between a closing position and an opening position of an associated discharge opening of the powder reservoir for discharging the powder into a mixing chamber which is passed by a supply line for compressed air for supplying a handpiece with a mixture of compressed air and abrasive powder particles.

Abstract: A foot switch for operation of at least two different functional members of a dental apparatus which is operatively connected with the foot switch has at least two press switches which are each formed as a diaphragm switch comprising a printed circuitry with an arrangement between two carrier foils which as a package are supported on a base plate of the foot switch within a hollow formed by an overlaid cover plate and connected by a signalling line with at least two different functional members of the dental apparatus for transmitting functional control signals upon depression of the cover plate.

Abstract: A pinch valve comprises a flexible tube member as a portion of a fluid line which for a flow control is arranged on a separate insert member made of a rigid material and provided with two axially aligned adapter pieces of the fluid line for being pinched by an actuator which directly contacts the flexible tube member at a control position of its cross-sectional area.

Abstract: Device for removal of calculi by using an intracorporeal lithotripter comprises a metallic probe or sonotrode which is excited by an electrically controlled ultrasonic transducer for generating longitudinal oscillations for the fragmentation of calculi via the distal end of the sonotrode, the sonotrode accommodating a coaxially arranged impact probe which for an alternative fragmentation of calculi transfers shock or pressure forces that are generated by the impact energy of a reversibly driven impact member or projectile which periodically hits against a mass body on the proximal end of the impact probe when its drive is alternatively switched-on.

Abstract: A device for removing calculi by using an intracorporeal lithotripter comprises a single metallic probe or sonotrode which for the fragmentation of calculi is connected with an electrically controlled ultrasonic transducer for generating longitudinal oscillations which alternatively may be switched to the generation of shock or pressure waves by either a pulse wave stimulated oscillation of the metallic probe or sonotrode or by a reversibly driven impact member or projectile which is accommodated by the hollow of a backward tubular extension of the sonotrode.

Abstract: A device for removing calculi by using an intracorporeal lithotripter comprises a single metallic probe or sonotrode which for the fragmentation of calculi is connected with an electrically controlled ultrasonic transducer for generating longitudinal oscillations which alternatively may be switched to the generation of shock or pressure waves by a pulse wave stimulated oscillation of the metallic probe or sonotrode.

Abstract: A dental abrasive blasting or jet apparatus is provided with an interconnected handpiece having a nozzle arrangement which is supplied with a dental powder as stored in a powder reservoir and delivered under pressure by a gaseous carrier medium via a powder supply line together with a fluid that is supplied via a separate fluid supply line. The apparatus is provided with a separate fluid receptacle or bottle which is filled with a flushing or rinsing liquid for being selectively supplied to the nozzle arrangement of the handpiece via a branch line having a change-over directional valve downstream of a suction pump for supplying the flushing or rinsing liquid to the portion of the fluid supply line that is directly connected with the handpiece.

Abstract: A metallic flexible probe for use in shock wave lithotripsy is provided next to its head portion and approximately at a transition to an adjoining initial length of the probe with a rated break point for causing without any disturbance of the energy flow along the length of the probe as optimized by different dimensional and material chracteristics of the probe a fracture at a position which most presumably will not lead to harmful injuries of the patient and to no damages of the surrounding lumen of the endoscope which is used in combination with a lithotripter.