Dragerwerk Aktiengesellschaft

Ralf-Ernst Loser

Ulrich Heim

Wolfgang Falb

Siegfried Kiske

Uvo Holscher

Karl-Ludwig Gippert

Christoph Maurer

Christoph Mauer

A valve for a respirator with a closing member, which is located at a valve seat 6 and is actuated by an electric drive 12, is improved in terms of its dynamic properties. A detector for detecting a first electric signal present at the moving drive a simulator for simulating a second electric signal generated at the nonmoving drive are provided. A comparator forms a differential signal between the first electric signal and the second electric signal. A closed action (feed back loop) circuit sets the position of the closing element in relation to the valve seat according to a preset valve p.sub.s. The differential signal is applied to the control circuit are provided.

Valve for a respirator

An ultrasonic atomizer for respiration systems, which is integrated in the breathing gas line from and to the patient via two connections. The ultrasonic atomizer is in a gas flow connection with the atomizer chamber to which an aerosol is admitted by a piezo vibrating element for the inhalation via a nonreturn valve. The arrangement bridges over the atomizer chamber for the exhalation via a second nonreturn valve by means of a second, spatially separated gas flow path.

Ultrasonic atomizer for respiration systems

A piezo valve arrangement for gas mixers or respirators, which is built up modularly from individual valve elements. At least one individual valve element, which is provided in its housing with a pressurized gas channel and a gas discharge channel, is arranged between a connection plate with a pressurized gas connection and a gas discharge connection, on the one hand, and a closing plate, on the other hand, wherein the direction of the gas flow in each valve element is from the pressurized gas channel via a metering screw, a metering channel, and a piezo vibrating element held freely vibrating on one side with a seal to the gas discharge channel.

Modular piezo valve arrangement

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

A process for calibrating a flow sensor in a respiratory system, with final control elements arranged in the respiratory system for influencing the respiration gas stream, is to be improved in terms of the influence of the qualitative gas composition of the respiration gas. To accomplish the task, the final control elements 4, 11 are switched, for calibration, over to a closed respiratory system with directed respiration gas stream. The drive unit 13 feeds the respiration gas present in the respiratory system through the flow sensor 9 according to a predetermined time-volume relationship. A calibration value for the flow sensor 9 is formed by comparison of the time-volume relationship with the measured signal of the flow sensor 9.

Process for the calibration of a flow sensor in a respiratory system

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

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.

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Kreuzkamp, Germany

Ralf-Ernst Loser