Dragerwerk Aktiengesellschaft

Other

Draegerwerk, Ag

Dragerwek Aktiengesellschaft

Siegfried Kiske

Ulrich Heim

Wolfgang Falb

Uvo Holscher

Karl-Ludwig Gippert

Ralf-Ernst Loser

Christoph Maurer

Carl F Wallroth

Erik Schwanbom

Wolfgang Sauer

Thomas Leyer

Hans-Karsten Reimers

Thorsten Haase

Ulrich Palm

Bernhard Schaible

Christoph Mauer

Ernst-Guenter Scharmer

Karsten Hoffmann

A mobile medical supply device with a supply apparatus, especially an anesthesia apparatus, with a plurality of supply and drain lines. To make simple handling possible in connection with the moving along of the supply and drain lines during the movement of the supply apparatus ( ) and to make it at the same time possible to install the entire device simply and inexpensively, the supply apparatus ( ) can be moved on rollers ( ) and a ceiling fixture ( ) with a rotatably suspended multilink arm ( ) is provided, which arm carries a frame ( ) at its end away from the axis of rotation of the ceiling fixture ( ), so that the frame ( ) is movable due to the rotation of the multilink arm ( ) and the pivoting of the links ( ) of the arm in relation to one another. Furthermore, a mechanical connection ( ) is provided between the supply apparatus ( ) and the frame ( ), and the connection ( ) has clearance for vertical movements between the frame ( ) and the supply apparatus ( ), so that unevennesses of the floor can be compensated during the movement of the supply apparatus ( ) without load on the ceiling fixture. The frame ( ) is provided with a supply and drain lines suspending apparatus. The supply apparatus ( ) of the device can thus be moved and supply and drain lines suspended on the frame ( ) are carried automatically and simple handling is thus possible. At the same time, the ceiling fixture ( ) may be designed as a simple and inexpensive ceiling fixture because of the low load to which it is subjected.

Mobile medical supply device

A ventilating apparatus includes a closed breathing loop (3) which is supplied with the gases needed for ventilation via a metering unit (9). The ventilating apparatus is improved in such a manner that the respiratory gas can be metered during the inspiration phase without affecting the respiratory gas stroke volume supplied to the patient. The ventilating apparatus includes a flow-measuring device (14) for detecting a gas volume (V.sub.F) which is metered into the closed breathing loop (3) during the inspiration phase. A subtraction element (16) forms a difference volume (V.sub.T -V.sub.F) between the pump volume (V.sub.T) and the gas volume (V.sub.F). A switch (21) permits utilizing the difference volume (V.sub.T -V.sub.F) as a new adjusting value for the pump volume of the respiratory gas pump unit (2).

Ventilating apparatus

A delivery device for supplying a respirator with breathing gas includes a cylinder housing with a piston, and a drive unit for generating delivery strokes, which is connected to the piston via a piston rod. A compact design is achieved by providing the drive unit with a motor-driven hollow shaft with a spindle acting as a piston rod displaceable in it telescopically.

Delivery device for a respirator

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 ventilating apparatus including a ventilating device and a closed breathing circuit wherein fresh gas is metered by means of a controller via a fresh gas line. A reservoir having a changeable volume is connected to the fresh gas line. In this way, at least the quantity of respirating gas which is consumed is again replenished. This arrangement is improved such that a very small quantity of respirating gas can be metered with the compliance of the entire system being low and remaining necessarily constant. With the invention, a system is obtained which is easy to control with the smallest possible configuration and least complex measuring sensors. For this purpose, a reservoir connected downstream of the metering unit is branched off of the fresh gas line and is provided with a level indicator. The signal of the level indicator indicates the level and is supplied as an actual value to the controller and compared to a pregiven desired value. A cutoff device is interposed ahead of the location at which the fresh gas line communicates with the breathing circuit.

Ventilating apparatus that maintains low/constant compliance

The invention is directed to an arrangement for generating and metering a gas mixture which includes controllable adjusting elements whereby the gas mixture is either conducted through a bypass line past a vaporizer unit to a consumer or is conducted through the vaporizer unit and from there to the consumer. With this arrangement, a calibration of the carrier gas metering especially at low flow quantities is obtained which is continuously reproducible and either carried out manually or automatically without interruption of the metering operation. This is achieved in that a calibrating line opens into a calibrating vessel upstream of the vaporizer unit and the calibrating vessel can be separated by way of shutoff valves from the vaporizer line and a level indicator is connected to the calibrating vessel.

Metering arrangement for a gas mixture

A piston and cylinder unit provides a supply actuable by means of an actuation device for delivering respiratory air in a respiratory cycle of a respirator. Its piston is sealed with its cylinder by means of a pair of rolling membranes arranged symmetrically with regard to one another. The membranes separate the cylinder contents into an antechamber and a working chamber. The wear of the rolling membranes during the working strokes and especially during the starting is decreased by a clean rolling of the folds. Also a leakage control takes place even during operation and an immediate detection of leaks due to bending stress, aging or other influences is guaranteed. For this purpose an inner chamber which is enclosed by the two rolling membranes is under a pressure different from the pressure in the antechamber and the working chamber so that the highest pressure is on a concave inside of the folds.

Piston and cylinder unit as supply device for the respiratory air of a

The invention is directed to a pumping arrangement for supplying a ventilating apparatus with breathing gas. The pumping arrangement includes a piston which runs in a cylinder and the piston is connected via a coupling with a drive unit for generating the pumping strokes. The coupling engages a motion transmitter in the form of a piston rod. Gas connecting ports for the breathing gas to be pumped open into the inner chamber of the cylinder. The pumping arrangement permits the piston-cylinder unit to be simply removed and to be reinstalled with reliable guidance. An automatic latching occurs such that a release and removal of the piston-cylinder unit from the ventilating apparatus and its uncoupling from the drive unit is possible only in a rest condition and not during operation. For exchanging the piston-cylinder unit, the motion actuator in the form of the piston rod moves through a preparatory stroke having an end position in which the coupling as well as the latching of the piston-cylinder unit with respect to the housing can be actuated.

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Gross Gronau, Germany

Siegfried Kiske