Dragerwerk Aktiengesellschaft

Karl-Ludwig Gippert

Wolfgang Falb

Ulrich Heim

Siegfried Kiske

Uvo Holscher

Ralf-Ernst Loser

Christoph Maurer

Stefan Linke

Uwe Bausch

Stefan Moll

Carl-Friedrich Wallroth

Eric Hecker

Christoph Mauer

Udo Feldhoff

A device for removing at least laughing gas and anesthetic vapor from a gas sample based on a molecular sieve shall be improved such that it possesses good adsorption properties for both gas components. A molecular sieve arrangement is provided, which is flown through from a gas inlet to a gas outlet and comprises a first molecular sieve area with a first pore size between about 0.3 nm and 0.5 nm and a second molecular sieve area with a second pore size between about 0.8 nm and 1 nm.

Device for absorbing a gas mixture consisting of laughing gas and

A safety filling device for filling a liquid anesthetic into a reservoir of an anesthetic-metering device with a receiving device, which has an inlet opening for a coupling piece or a closing piece. An essentially rigid guide lever is provided in the connection area between the receiving device and the closing piece. A hinge connection is provided which makes possible an axial displaceability of the guide lever within the inlet opening and a rotary movement of the guide lever outside the inlet opening.

Safety filling device for anesthetic evaporators

A device for mixing anesthetic vapor with a gas according to the bypass principle such that anesthetic gas or liquid anesthetic is prevented from escaping from the evaporator chamber during transportation. The switching on of the anesthetic evaporator takes place under defined pressure conditions in the evaporator chamber. A transport position, which precedes the switch-off position, and in which a ventilating valve of a ventilating line arriving from the evaporator chamber is switched into the switch-off position by the setting member, is provided on the setting member.

Anesthetic evaporator

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.

Locking device for a metering device for an anesthetic vaporizer

The invention is directed to a filling arrangement for filling and emptying an anesthetic vaporizer with an anesthetic liquid from a supply vessel via a filling channel and a venting channel. The filling arrangement includes a connecting piece for connecting the arrangement to the anesthetic vaporizer and has a blocking device mounted in a conduit member which includes the filling channel and venting channel. The filling arrangement is improved so that it can be reliably handled with anesthetic liquids having a low boiling point. For this purpose, the blocking device includes a temperature-sensitive switching member which enables the filling channel to be opened below a preselected limit temperature and to be closed above this preselected temperature. The preselected temperature is below the boiling point of the anesthetic liquid.

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Lubeck, Germany

Karl-Ludwig Gippert