Abstract: In a device for detecting transmission losses of optical light guide means (2) of an endoscope (3) by means of measurements, said optical light guide means (2) having an optical inlet portion (4) through which light from a light source (6) is transmitted to an optical outlet portion (8) of the means to be checked, said device comprising at least one light sensor (10) measuring the light intensity emerging from the optical outlet portion (8) of the means (2) to be checked, and an evaluation means (14) for the signal of the at least one light sensor (10), said evaluation means (14) having a display means (18) for displaying the measurement result, it is provided that the at least one light sensor (10) is arranged in a chamber (20), that the optical outlet portion (8) of the light guide means (2) to be checked is adapted to be introduced through an opening (22) of the chamber (20) into the chamber (20), and that the inner surface (24) defining the chamber (20) diffusely reflects the light emerging from the optic

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 dental apparatus comprises a connector arrangement for allowing a connection of a fluid reservoir containing a fluid which is supplied to a dental handpiece under control of a valve arrangement by a suction pump which has a suction line that is connected with a reception member of a connector piece of the fluid reservoir on which a closure one-way check valve is arranged which is biased by a closure spring towards a closing position on a valve seat of the connector piece which is further provided with an aeration one-way check valve over an aeration opening for compensating a negative pressure which will be produced inside of the fluid reservoir when the closure one-way check valve is opened at its valve member and fluid is drawn from the fluid reservoir for being supplied to the handpiece.

Abstract: A medical instrument for treating biological tissue comprises a housing (2), a pressure wave generation means (4) and a transmission means (8) for coupling the unfocused pressure waves into the body of living beings. The transmission means (8) comprises a pressure chamber (12) having an inlet and an outlet end, the pressure chamber (12) containing a liquid (14) into which pressure waves from the pressure wave generation means (4) can be coupled, which pressure waves can be transmitted to a membrane (16) arranged at the outlet end of the pressure chamber (12) which membrane (16) couples the pressure waves transmitted from the liquid unfocusedly into the biological tissue.

Abstract: A filtration device for separating concrements, fragments or other body material from liquids which are processed by means of a lithotripter connected to a suction device equipped with a peristaltic valve and sucked out of body cavities. The device has a functional zone having an inlet zone connected at one end to the lithotripter, and an outlet zone connected to the suction device. There is a collection zone mounted on the functional zone and connected to the other end of the inlet zone. A filter element is disposed between the functional zone and the collection zone, so that body material processed by the lithotripter will be deposited in the collection zone, and the filter element will separate the body fluids collected by the lithotripter from the body material.

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 dental handpiece for use with a device for treatment of teeth by means of a jet of an abrasive powder mixed with air and water comprises a first one-way valve means in a first supply line for pressurised air connected to an integrated powder container of a gripping sleeve whereby at least a first filter means is further provided in this first supply line at a position upstream of the first one-way valve means and downstream of a connecting end of the supply line with a common supply means for air and water which is provided at the rearward end of the gripping sleeve. A second filter means is provided at a position downstream of the first one-way valve means in the first supply line and a second one-way valve means is provided in a second supply line for water together with a third filter means. The first and third filter means each comprise a fine-meshed screen body. The second filter means comprises a microporous sintered metallic body or a microporous plastic body.

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 dental apparatus comprises means for allowing a connection of a fluid reservoir containing a fluid which is supplied to a dental handpiece under control of a valve arrangement by a suction pump which has a suction line that is connected with a reception member of a connector piece of the fluid reservoir on which a closure one-way check valve is arranged which is biased by a closure spring towards a closing position on a valve seat of the connector piece which is further provided with an aeration one-way check valve over an aeration opening for compensating a negative pressure which will be produced inside of the fluid reservoir when the closure one-way check valve is opened at its valve member and fluid is drawn from the fluid reservoir for being supplied to the handpiece.

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: For a surgical instrument for removing distal and/or peripheral cement (2) and/or a medullary block in a medullary cavity (8) when endoprostheses are replaced, the surgical instrument comprising a drilling tool (4) and an extraction tool (6), it is provided that the drilling tool (4) and the extraction tool (6) comprise a bore (14,16) extending coaxially to the respective tool shaft (12) for receiving a centering bolt (10), that the bore diameter of the coaxial bores (14,16) of the drilling tool (4) and the extraction tool (6) is substantially adapted to the diameter of the centering bolt (10), and that the centering bolt (10) anchored at a predetermined location in the cement (2) or the medullary block and the medullary space (5) located distally below it is configured as an axial guide for the drilling tool (4) and the extraction tool (6), respectively.

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 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 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 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 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: An ejection device for ejecting a liquid or a liquid containing solid particles at high pressure, comprising a head unit; a pressure chamber (11) which opens into a distal ejection opening and is delimited by a working piston which, upon application of an elastic impact on its end facing away from the pressure chamber, is capable of transmitting a compression wave which may displace the pressure chamber-facing end of the working piston into the pressure chamber so that the volume thereof is reduced, with the reduction in volume of the pressure chamber being significantly smaller than the original volume of the pressure chamber; and a drive unit having a drive member which is accelerated across an acceleration portion formed within the drive unit so that it generates the elastic impact to be transmitted to the working piston. The pressure chamber is at least partially formed by a pressure cavity formed in the head unit.

Abstract: The invention relates to a medical instrument for treating biological tissue, comprising a device for generating extra-corporeal pressure waves and a transmission element (2) for injecting pressure waves into the bodies of living organisms. According to the invention the transmission element (2) has a blunt probe tip (22) with a flat exit surface (24) which injects non-focused mechanically generated pressure waves into the biological tissue.

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.