Dragerwerk Aktiengesellschaft

Christoph Maurer

Ulrich Heim

Wolfgang Falb

Siegfried Kiske

Uvo Holscher

Karl-Ludwig Gippert

Ralf-Ernst Loser

Hans Matthiessen

Edmund Koch

Johann Otten

Ralf E Loser

Jens-Uwe Hagenah

A gas ratio control device for anesthetic apparatus with an anesthetic gas feed line 1, which has a control valve 12 and a first measuring resistance 6, and an oxygen feed line 2 with a second measuring resistance 10, wherein the differential pressure determined from the measuring resistances is sent to a proportional member 13 for regulating oxygen feed to anesthetic gas feed. So oxygen concentration will not drop below a minimum oxygen concentration value in the case of anesthetics to be metered at both low and high doses, one of the measuring resistances 6, 10 can be replaced or bridged over with a bypass line 14, which contains a throttle point 15 (FIG. 1).

Gas ratio control device for anesthetic apparatus

A filling device for anesthetic vaporizers, with a connection piece which can be connected to a connection opening of an anesthetic reservoir in a gas-tight and liquid-tight manner. Leakage of anesthetic gas or liquid anesthetic can be avoided during the filling especially of low-boiling anesthetics by providing the reservoir 10 with a seal 17, which closes the connection opening 9 at least in a liquid-tight manner and can be opened by a projection 5 which is arranged on the connection piece 2 and extends into the interior space of the connection opening 9, as soon as the connection piece 2 is sealed off from the surroundings against the connection opening 9 by a sealing element 15 in a gas-tight and liquid-tight manner.

Filling device for anesthetic vaporizers

The invention pertains to a cooling device for cooling breathing gas in a respiratory protection device with a heat collector exposed to the breathing gas stream. Such a cooling device is to be improved such that it can be prepared for cooling at any desired time prior to putting the respiratory protection device into operation, and that cold storage of a coolant is not required. The improvement is achieved by designing the heat collector as a storage tank for an evaporable liquid, which can be connected to an evacuated adsorbent container such that the liquid will evaporate while absorbing heat of vaporization, and its vapor is adsorbed on an adsorbent contained in the adsorbent container while releasing heat of adsorption and heat of condensation, wherein the adsorbent container is designed as a cooling body that is arranged outside the breathing gas stream and is intended to release the heat into the surroundings.

Cooling device for cooling breathing gas in a respiratory protection

A metering device for a liquid anesthetic that is fed from a reservoir via a supply line into a heatable intermediate container maintained under pressure, from which gaseous anesthetic is fed via a metering valve into a fresh gas line. Accurate metering, which can be better monitored, is provided for low-boiling anesthetics. A supply unit 7 is mounted in the supply line 5, and liquid anesthetic is transported by the supply unit 7 into the intermediate container 6 until it is filled up to a predetermined filling level. A heating device 12 stabilizes the temperature of the liquid bath and ensures a sufficiently high vapor pressure of the gaseous anesthetic above the liquid phase. The anesthetic vapor is sent via the metering valve into the fresh gas line.

Metering device for a liquid anesthetic via an intermediate container

A metering pump for metering low-boiling liquids, especially liquid anesthetics provides continuous metering of liquid. To achieve this, the pump chamber 7 is maintained at a temperature below the boiling point of the liquid by means of a cooling device 14, preferably a Peltier cell.

Pumping device for the metered feed of liquids

An anesthetic metering device is provided with a temperature-stabilized anesthetic vapor source, from which anesthetic vapor 14 is metered into a carrier gas stream via a delivery line 8 with a metering valve 11 that can be controlled by a control unit 6. The arrangement is provided so that uncontrolled evaporation of anesthetic is prevented. To accomplish this task, the anesthetic vapor source is designed as a vaporizer chamber 2 filled with liquid anesthetic 3, and a gas delivery element 9 generating the metering pressure P.sub.I is present in front of the metering valve 11.

Anesthetic metering device

The invention is directed to a method of operating a laser diode in a measuring system for spectroscopically measuring the concentration of a gaseous component in a gas sample. This method is improved in that the mode jumps of the laser diode are easily recognized when adjusting the temperature-current operating point of the laser diode. An optical filter is placed in the beam path for adjusting the temperature-current operating point of the laser diode and, by changing the temperature T and the operating current I of the laser diode while simultaneously receiving the output signal supplied by an evaluation unit, the spectral positions of the mode jumps of the laser diode are determined which are included in the absorption lines of the gas sample. Thereafter, the temperature-current operating point is adjusted so that the distance of this operating point to the positions of the mode jumps is not less than a fixed spacing. The invention is also directed to a measuring system for spectroscopically measuring the concentration of a gaseous component in a gas sample.

System for measuring the concentration of a gaseous component by

An anesthetic metering device with a bypass stream 5 passed from a gas inlet opening 2 via a bypass valve 3 to a gas discharge opening 4 and with a vaporizer chamber stream 7 flowing from a vaporizer chamber 6 via an adjusting device. Accurate metering is possible even in the case of anesthetics with low boiling points by manufacturing the vaporizer chamber 6 at least at the saturation vapor pressure of the anesthetic 22. The adjusting device includes a differential pressure transducer 9 connected on both sides of the bypass valve 3 and a metering valve 10, wherein the metering valve 10 is actuated by the output quantity 11 of the differential pressure transducer 9 via a proportional member 12 so that the concentration is adjusted via the variable transmission ratio of the proportional member 12.

A locking device 5 for a metering device 3 of an anesthetic vaporizer 1 with an unlocking device 6 for actuating the metering device 3 is provided so as to ensure blocking of the unlocking device 6 in operating states that are unsuitable for the operation of the anesthetic vaporizer 1. The locking device 5 is provided having a final control element 20, 24, 29 that covers a regulating distance that depends on a parameter influencing the operating state of the anesthetic vaporizer 1. This regulating distance of the final control element is transmitted to a blocking device 13 which blocks the unlocking device 6 if the values of the parameter are unsuitable for the operation of the anesthetic vaporizer 1.

Locking device for a metering device for an anesthetic vaporizer

The invention is directed to a measuring apparatus for detecting gases with the aid of an electrochemical sensor with a diffusion barrier being disposed ahead of the sensor. The measuring apparatus is improved in such a manner that the sensor is adaptable with respect to its sensitivity to different measuring ranges during operation without external intervention. The speed of response of the sensor is also increased. Diffusion openings in the diffusion barrier are closable with a valve arrangement associated with the valve openings. The valve arrangement is connected via a valve drive unit to a measurement value comparator for changing the operating position of the particular valve to be actuated.

Measuring apparatus for detecting gases

The present invention pertains to a pump, in which two pistons moving in the same direction in a common cylinder bore are provided to generate the suction intake and pressure, discharge effects as well as for control. Both pistons are held by fastening members to perform a lifting movement, and one of the pistons is a control piston for performing a constant lifting movement, while the other piston is a pump piston for performing a variable lifting movement. The difference in the lifts, multiplied by the cross section of the cylinder bore, determines the delivery volume of the pump. A braking force to the oscillating piston eliminated and the velocity of discharge of the medium to be delivered is increased by providing a member 8, whose longitudinal extension between fastening members of the two pump pistons is variable during one pump cycle so as to generate the difference between the heights of lift of the two pistons that are rigidly connected to said fastening members.

Valveless pump

The invention is directed to a pressure reducer having an outlet pressure which is controllable via a desired value-actual value comparison. The desired value of the outlet pressure is selectable in a simple manner and can be maintained independently of changes of the through-flow or input pressure. This result is achieved by providing a regulating element equipped with a drive device. The control unit is connected to the drive device for actuating the regulating element by means of a regulating control signal determined from the comparison between the desired value of pressure and the measured outlet pressure.

Pressure reducer

The invention is directed to a pressure reducer wherein the outlet pressure thereof is regulated by means of a comparison of the desired value with the actual value such that the adjusting range is expanded. This expansion of the adjusting range is obtained in that the adjustment of the biasing force of the membrane effects a corresponding adaptation of the desired value applied to a control unit via a position-value transmitter.

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Bad Schwartau, Germany

Christoph Maurer