GB2026326A - Respiratory apparatus - Google Patents

Respiratory apparatus Download PDF

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Publication number
GB2026326A
GB2026326A GB7924892A GB7924892A GB2026326A GB 2026326 A GB2026326 A GB 2026326A GB 7924892 A GB7924892 A GB 7924892A GB 7924892 A GB7924892 A GB 7924892A GB 2026326 A GB2026326 A GB 2026326A
Authority
GB
United Kingdom
Prior art keywords
valve
pressure
monitoring
connected
respiratory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB7924892A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Draegerwerk AG and Co KGaA
Original Assignee
Draegerwerk AG and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19782831312 priority Critical patent/DE2831312A1/en
Application filed by Draegerwerk AG and Co KGaA filed Critical Draegerwerk AG and Co KGaA
Publication of GB2026326A publication Critical patent/GB2026326A/en
Application status is Withdrawn legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/20Valves specially adapted to medical respiratory devices
    • A61M16/201Controlled valves
    • A61M16/202Controlled valves electrically actuated
    • A61M16/203Proportional
    • A61M16/204Proportional used for inhalation control
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/021Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
    • A61M16/022Control means therefor
    • A61M16/024Control means therefor including calculation means, e.g. using a processor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/20Valves specially adapted to medical respiratory devices
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0096High frequency jet ventilation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/0027Accessories therefor, e.g. sensors, vibrators, negative pressure pressure meter

Abstract

A respiratory apparatus, for supporting breathing and/or for providing artificial respiration, has a valve (25) for controlling the supply of respiratory gas. The valve includes a valve member (28) displaceable relative to an opening in a valve body and actuated electrically. A monitoring and control means (30, 34) which determines or is responsive to a required value of a parameter of the respiratory gas, monitors the actual value of that parameter and controls the valve member (28) so as to maintain the actual value of that parameter equal to the required value. <IMAGE>

Description

SPECIFICATION Respiratory apparatus for supporting breathing and/or for artificial respiration This invention relates to a respiratory apparatus for supporting breathing and/or for artifical respiration, and more particularly, but not exclusively, relates to such an apparatus for high frequency respiration.

Known respiration apparatuses are controlled in accordance with the respiratory rhythm, the resulting respiration frequencies being 8 to 30/minute for adults and up to 60/minute for new-born babies.

The present invention is more particularly concerned with an apparatus capable of supplying air at frequencies which are in the range of a few multiples up to about 50 times the usual, natural frequencies. Such respiration will hereinafter be referred to as "high frequency respiration". The respiratory mean pressure in a patient's lungs is lowered during high-frequency respiration in comparison with that during respiration of normal frequency.

During such high frequency respiration, the volume of each gas pulse is so small that there is little movement of the lungs. Gas transfer is effected with the lungs by turbulence and diffusion. The inflowing gas is supplied directly to the lungs by a supply duct or tube reaching deeply into the lungs. Exhaled air continually flows from the lungs through another tube which is always open. To maintain a continuous Positive Airway Pressure, a valve may be provided in this other tube. All the control functions for high frequency respiration are preferably effected electrically.

A control circuit arrangement, in respiratory apparatus suitable for frequency, is known in which the gas pressure in a gas supply lead is reduced by way of a mechanical pressure reducer to the pressure required at the input of the respiration catheter. An electromagnetic valve, which intermittently opens or closes the passage to the patient in accordance with the control is provided downstream from the pressure reducer. The arrangement can include, for the purpose of mixing several gases a mechanical mixing valve upstream of the pressure reducer or several mechanical pressure reducers which are connected in a parallel manner for the various gases as well as a mixture indicator and a flow meter.

This arrangement comprises a plurality of individual components, of which only the last element, that is the electro-magnetic control valve, is electrically controllable. The components and connection leads result in there being relatively high volumes of gas inside the apparatus, which causes low-pass behaviour as gas pulses supplied at a high frequency for high frequency respiration are attentuated in these volumes. The flow occurs in an undefined manner from the pressure behind the pressure reducers and from the nature of the patient part. Therefore the flow cannot either be selected in a defined manner or be electrically controlled. (Sjöstrand, 1977 ACTA Anaesthesiologica Scandinavica, Supplernentum 64, Munksgaard-Copenhagen).

According to the present invention, there is provided a respiratory apparatus for supporting breathing and/or for providing artifical respiration, the apparatus comprising: a valve, for controlling the supply of respiratory gas, which valve includes a valve member dispiaceable relative to an opening in a valve body and actuated electrically; and a monitoring and control means which determines or is responsive to a required value of a parameter of the respiratory gas, which monitors the actual value of that parameter and which controls the valve member so as to maintain the actual value of that parameter substantially equal to the required value.

All the operations of a respiratory apparatus according to the present invention can be controlled electrically. The apparatus can be capable of emitting a defined quantity of gas, can control the variation of flow with respect to time during a respiration pulse, and can have a small volume of gas inside the apparatus.

The valve member can be actuable by an electrical actuator controllable by the monitoring and control means. The electrical actuator preferably comprises a solenoid and a movable member which is capable of being moved by a magnetic field produced by the solenoid.

Preferably the valve member comprises a spherical body disposed upstream, in terms of the intended flow direction of respiratory gas, of the opening.

Ball valves, i.e. valves including a spherical valve member, actuated by an electrical actuator are preferable as they allow short switching times, and are generally reliable and permit small dimensions of the apparatus. The electro-dynamic drive enables the control and monitoring means to comprise only electrically driven devices. Ball valves only require small volumes of gas inside the apparatus and are therefore most suitable for an apparatus according to the invention which requires short switching times. The gas consumption is essentially smaller relative to the other known respiration apparatus which use fluidic control elements. Gas mixers may be produced by arranging a number of valves in parallel, in terms of gas flow, which valves are actuated simultaneously.

Preferable the movable member of the actuator is connected to a shaft which passes through the valve body into the interior of the valve and which is capable of displacing the spherical body from the portion of the body defining the opening.

The apparatus can also include a pressure monitoring device connected to the valve for monitoring the pressure of respiratory gas in the valve.

In one embodiment of the present invention, the apparatus can further include a second device for monitoring the displacement of the valve member, wherein the monitoring and control means comprises a first unit for determining a required value of the volume of respiratory gas that has passed through the valve, and a second unit which is connected to the pressure-monitoring device, to the second device and to the first unit, which determines the actual volume of respiratory gas that has passed through the valve as a function of the pressure in the valve and of the displacement of the valve member, and which controls the valve member so as to maintain the actual volume substantially equal to the required volume.

In another embodiment of the present invention, the distance that the valve member can be displaced from the opening is limited and the monitoring and control means is connected to the pressure-monitoring device and controls the valve member as a function of time.

The pressure monitoring device can be connected to an inlet of the valve for monitoring the actual pressure of gas supplied to the valve or to an outlet of the valve for monitoring the actual pressure of respiratory gas discharged from the valve.

In yet another embodiment of the present invention, the pressure-monitoring device is connected to an outlet of the valve for monitoring the actual pressure of gas discharged from the valve, and the monitoring and control means comprises a first unit for determining the pressure required for respiratory gas discharged from the valve, and a second unit which is connected to the pressure-monitoring device and to the first unit, and which controls the valve member so as to maintain the actual pressure substantially equal to the required pressure. Preferably the outlet of the valve is connected to a throttle, and the first unit determines the pressure required with regard to the flow characteristics of the throttle. Preferably the second unit is connected to the electrical actuator.Preferably the valve includes a threaded adjustment member which is engaged with a threaded portion of the valve body and which limits the travel of the valve member. The apparatus can also include a tube having an outlet and an inlet connected to an outlet of the valve, which tube is suitable for insertion into a patient's trachea and has an external cross-section which is smaller than the internal cross-section of the trachea.

The tube can be connected in parallel to a second tube for measuring the pressure downstream of the valve, one end of the second tube opening adjacent the outlet of the first mentioned tube. The first-mentioned tube can also be connected in parallel to a third tube for supplying moisture.

The second-mentioned embodiment of the present invention can also include another pressure-monitoring device connected to the other end of the second tube and connected electrically to the monitoring and control means.

For a better understanding of the present invention and to show more clearly how the same may be carried into effect reference will now be made, by way of example, to the accompanying drawings in which: Figure 1 shows a first embodiment of a respiratory apparatus according to the present invention comprising a valve and an actuator, shown in section, and associated control compnents, shown diagrammtically; Figure 2 shows a second embodiment of a respiratory apparatus according to the present invention comprising a valve and an actuator, shown in section, and associated control components shown digrammatically; Figure 3 is a diagram of the respiratory apparatus of Fig. 2; and Figure 4 shows a third embodiment of a respiratory apparatus according to the present invention comprising a valve and actuator, shown in section, and associated control components shown diagrammatically.

Referring to Fig. 1, a valve 25 has a valve body 37 which includes an inlet 4. The valve body 37 has a valve seat 35 defining an opening in the valve body 37. A ball, or spherical body, 28 can abut the valve seat 35 so as to close that opening. A shaft 36 of an electrical actuator 26 passes through the valve body 37 into the interior of the valve 25. The electrical actuator 26 comprises a magnet 38 provided with internal and external pole pieces 41 and 42. A coil 39 is carried by a coil support 40 secured to the shaft 36. The valve 25 is controlled by control and monitoring means comprising a first unit 34 and a second unit 30 connected by a line 33 to the first unit 34. The second unit 30 is also connected to the electrical actuator 26, to a pressure-monitoring device 31 by a line 32, and by a line 29 to a device 27 for measuring the axial displacement of the coil 39 and the shaft 36, and hence of the ball 28. The pressure-monitoring device 31 monitors the pressure in the inlet 4.

In use, respiratory gas under pressure is supplied to the inlet 4. The ball 28 can be displaced by a varying amount from the valve seat 35 by means of the shaft 36 which itself can be displaced axially by a varying amount by varying the current supplied to the electrical actuator 26. The pressure of the supplied respiratory gas is such as to urge the ball 28 against its valve seat 35. The first unit 34 determines the required or theoretical value, QTHEORY. of the quantity of gas that should have passed through the valve 25; the unit 34 determines this required value independently or in response to an input relating to the required value.The second unit 30 calculates the actual quantity of gas, 0FACTUAL' that has passed through the valve 25 from the pressure monitored by the device 31 and from the displacement x of the ball 28 monitored by the device 27. The second unit 30 then compares QACTUAL with THEORY and controls the actuator 26 and hence the ball 28 of the valve 25 so as to maintain 0ACTUAL substantially equal to QTHEORY The second embodiment, shown in Figs. 2 and 3, is the same as that of that first embodiment in many respects. A valve 1 has a ball 2 displaceable relative to a valve seat 3 defining an opening, and also an inlet 4.A pressure monitoring-device 9 is disposed downstream, in terms of the intended flow direction of respiratory gas, of the ball 2 and a tube 24 intended for insertion into a patient's trachea is connected to an outlet of the valve 1. The ball 2 is displaceable under the action of a shaft 5 driven by an electrical actuator 6. A second unit 7, of the control and monitoring means, is connected to the pressure monitoring unit 9 by a line 10, to a first unit 12 by a line 11 and to the electrical actuator 6.

In use, respiratory gas under pressure is supplied to the inlet 4, and the pressure of this gas urges the ball 2 against the valve seat 3. The first unit 12 determines a required or theoretical value, PTHEORY of the pressure in the outlet of the valve 1; the unit 12 determines this value either independently or in response to an input relating to that required value. The second unit 7 compares this theoretical value, PTHEORY, with anactual value P an ' ACTUAL monito- ried by the pressure-monitoring device 9 and then controls the actuator 6 and hence the valve 1 so as to maintain the required pressure, THEORY substantially equal to the actual value, PACTUAL. As shown in Fig. 3, a throttle 8 can be connected downstream of the valve 1.

The tube 24 may constitute the throttle 8; for this purpose the tube 24 may have a small internal diameter or a portion of the tube 24 adjacent the outlet thereof may have a small diameter. As, for most expected applications of the invention, the pressure at the outlet of the tube 24 is not expected to vary substantially, the provision of the throttle 8 enables the flow rate through the valve to be controlled by only controlling pressure downstream of the valve and upstream of the throttle 8, which pressure is monitored by the pressure-monitoring device 9.

The fourth embodiment, shown in Fig. 4, has a valve 13 provided with a ball 14 displaceable from a valve seat 19. A threaded adjusting member 16 limits the maximum travel 15 of the ball 14. The adjusting member 16 is screwed into a threaded portion of the housing of the valve 13. The ball 13 can be displaced from the valve seat 19 by means of a shaft 20 driven by an actuator 17. As in the first embodiment a pressure monitoring device 21 monitors the pressure in the inlet 4 and is connected by a line 22 to the unit 18 which comprises the control and monitoring means. An input 23 is supplied to the unit 18 which input relates to the required or theoretical volume of gas that should have passed through the valve 13.The control unit 18 controls the valve 13 with respect to time and sends a signal to the actuator 17 so that the valve 13 is either fully opened, with the ball 14 abutting the adjusting member 16, or fully c,losed with the ball 13 abutting the valve seat 19. The flow rate through the valve 13 when open will then depend only on the pressure difference across the valve 1 3. If the flow is hypercritical (i.e. with sonic velocity at the narrowest part of the valve 13) the flow rate through the valve 13 will only depend on the pressure at the inlet 4 as monitored by the device 21. It is expected that in practice the pressure downstream of the valve 13 will be substantially constant so that variations in flow rate will then depend only on variations in pressure upstream of the valve 13 as monitored by the pressure-monitoring device 21.However, the pressure downstream of the valve can also be monitored by a device which is connected electrically to the unit 18.

In order to obtain the desired mean flow rate through the valve 13 and hence maintain the volume of gas 0ACTUAL that has passed through the valve 13 equal to the theoretical quantity, THEORY, the unit 18 controls the valve 13 so that a series of pulses of gas are delivered through the valve 13; the unit 18 can vary the frequency and duration of these pulses.

Thus, the unit 18, which receives the input 23 and a signal from the pressure-monitoring device 21 relating to the pressure of respiratory gas supplied to the inlet 4, can control the valve 14 so as to obtain the desired flow conditions through the valve 13.

As shown for the second embodiment of Fig. 2, a tube 24 may be connected to the valve body of a valve according to the present invention. Furthermore, this tube 24 may be parallel to a second tube for measuring the pressure in the lungs and to a third tube opening adjacent the exit or opening of the tube 24 for the purpose of supplying water to prevent dehydration of the lungs. In this case, the tubes can all comprise catheters. If the third embodiment of the present invention (shown in Fig. 4) is provided with such a second tube for monitoring pressure, this second tube can be connected to another pressure monitoring device which is connected electrically to the unit 18.

Claims (20)

1. A respiratory apparatus for supporting breathing and/or for providing artificial respi ration, the apparatus comprising: a valve, for controlling the supply of respiratory gas, which valve includes a valve member displaceable relative to an opening in a valve body and actuated electrically; and a monitoring and control means which determines or is responsive to a required value of a parameter of the respiratory gas, which monitors the actual value of that parameter and which controls the valve member so as to maintain the actual value of that parameter substantial ly equal to the required value.
2. A respiratory apparatus as claimed in claim 1, wherein the valve member is actuable by an electrical actuator controllable by the monitoring and control means.
3. A respiratory apparatus as claimed in claim 2, wherein the electrical actuator com prises a solenoid and a movable member which is capable of being moved by a magnetic field produced by the solenoid.
4. A respiratory apparatus as claimed in any preceding claim, wherein the valve member comprises a spherical body disposed upstream, in terms of the intended flow direction of respiratory gas, of the opening.
5. A respiratory apparatus as claimed in claim 4, when appendant to claim 3, wherein the movable member of the actuator is connected to a shaft which passes through the valve body into the interior of the valve and which is capable of displacing the spherical body from the portion of the body defining the opening.
6. A respiratory apparatus as claimed in any preceding claim, which also includes a pressure-monitoring device connected to the valve for monitoring the pressure of respiratory gas in the valve.
7. A respiratory apparatus as claimed in claim 6, which also includes a second device for monitoring the displacement of the valve member, wherein the monitoring and control means comprises a first unit for determining a required value of the volume of respiratory gas that has passed through the valve, and a second unit which is connected to the pressure-monitoring device, to the second device and to the first unit, which determines the actual volume of respiratory gas that has passed through the valve as a function of the pressure in the valve and of the displacement of the valve member, and which controls the valve member so as to maintain the actual volume substantially equal to the required volume.
8. A respiratory apparatus as claimed in claim 6, wherein the distance that the valve member can be displaced away from the opening is limited, and wherein the monitoring and control means is connected to the pressure-monitoring device and controls the valve member as a function of time.
9. A respiratory apparatus as claimed in claim 7 or 8, wherein the pressure-monitoring device is connected to an inlet of the valve for monitoring the actual pressure of respiratory gas supplied to the valve.
1 0. A respiratory apparatus as claimed in claim 7 or 8, wherein the pressure monitoring device is connected to an outlet of the valve for monitoring the actual pressure of respiratory gas discharged from the valve.
11. A respiratory apparatus as claimed in claim 6, wherein the pressure-monitoring device is connected to an outlet of the valve for monitoring the actual pressure of respiratory gas discharged from the valve, and wherein the monitoring and control means comprises a first unit for determining the pressure required for respiratory gas discharged from the valve, and a second unit which is connected to the pressure-monitoring device and to the first unit, and which controls the valve member so as to maintain the actual pressure substantially equal to the required pressure.
12. A respiratory apparatus as claimed in claim 11, wherein the outlet of the valve is connected to a throttle and wherein the first unit determines the pressure required with regard to the flow characteristics of the throttle.
13. A respiratory apparatus as claimed in any one of claims 7 to 12, when appendant to claim 2, herein the second unit is connected to the electrical actuator.
14. A respiratory apparatus as claimed in claim 8 or in any one of claims 9, 10 and 13 when appendant to claim 8, wherein the valve includes a threaded adjustment member which is engaged with a threaded portion of the valve body and which limits the travel of the valve member.
1 5. A respiratory apparatus substantially as hereinbefore described with reference to and as shown in Fig. 1, Figs. 2 and 3, or Fig.
4 of the accompanying drawings.
16. A respiratory apparatus as claimed in ay one of claims 1 to 14 including a tube having an outlet and an inlet connected to an outlet of the valve, which tube is suitable for insertion into a patient's trachea and has an external cross-section which is smaller than the internal cross-section of a trachea.
17. A respiratory apparatus as claimed in claim 16, wherein the tube is connected in parallel to a second tube for measuring the pressure downstream of the valve, one end of the second tube opening adjacent the outlet of the first-mentioned tube.
18. A respiratory apparatus as claimed in claim 17 when appendant to claims 8 and 9, which also includes another pressure-montiroing device connected to the other end of the second tube and connected electrically to the monitoring and control means.
19. A respiratory apparatus as claimed in claim 16, 17 or 18 wherein the first-mentioned tube is connected in parallel to a third tube for supplying moisture.
20. A respiratory apparatus as claimed in claim 16, 17 or 19 when appendant to claim 12, wherein the first-mentioned tube comprises the throttle.
GB7924892A 1978-07-17 1979-07-17 Respiratory apparatus Withdrawn GB2026326A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782831312 DE2831312A1 (en) 1978-07-17 1978-07-17 Device for respiratory assistance and / or artificial ventilation with a high frequency ventilator

Publications (1)

Publication Number Publication Date
GB2026326A true GB2026326A (en) 1980-02-06

Family

ID=6044569

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7924892A Withdrawn GB2026326A (en) 1978-07-17 1979-07-17 Respiratory apparatus

Country Status (4)

Country Link
DE (1) DE2831312A1 (en)
FR (1) FR2431293A1 (en)
GB (1) GB2026326A (en)
SE (1) SE7906134A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056148A1 (en) * 1980-12-29 1982-07-21 Honeywell B.V. Respirator
EP0088864A3 (en) * 1982-03-16 1984-08-15 Carl A. Hoyer GmbH High-frequency artificial respiration apparatus
WO1986002565A1 (en) * 1984-11-01 1986-05-09 Bear Medical Systems, Inc. Electronically-controlled gas blending system
FR2573658A1 (en) * 1984-11-26 1986-05-30 Air Liquide Positive expiratory pressure device
EP0277525A2 (en) * 1987-01-31 1988-08-10 Drägerwerk Aktiengesellschaft Expansion valve with an adjustable output pressure
EP0277526A2 (en) * 1987-01-31 1988-08-10 Drägerwerk Aktiengesellschaft Expansion valve with an adjustable output pressure
EP0282675A2 (en) * 1986-11-04 1988-09-21 Bird Products Corporation Flow control valve for a medical ventilator
US4874362A (en) * 1986-03-27 1989-10-17 Wiest Peter P Method and device for insufflating gas
EP0483401A1 (en) * 1990-10-30 1992-05-06 Siemens Elema AB Device, e.g. a lung ventilator, for controlling a fluid flow, particularly a gas flow
US5474062A (en) * 1987-11-04 1995-12-12 Bird Products Corporation Medical ventilator
WO2011000359A1 (en) * 2009-07-03 2011-01-06 F. Stephan Gmbh Medizintechnik Respiration device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1153893A (en) * 1981-05-11 1983-09-20 William F. Everett Metering valve
DE3435849C2 (en) * 1984-09-29 1987-04-16 Norbert Dipl.-Ing. 7037 Magstadt De Stroh
DE3582593D1 (en) * 1984-11-22 1991-05-23 Senko Med Instr Mfg Artificial high frequency breathing apparatus.
DE3446467A1 (en) * 1984-12-20 1986-07-03 Draegerwerk Ag Valve for gas pressure regulation
DE3608475A1 (en) * 1986-03-14 1987-09-17 Gerd Prof Dr Kobal A method and device for measuring sensory qualities
DE4206875A1 (en) * 1992-03-05 1993-09-16 Pierburg Gmbh Gas pressure regulation system, esp. for heating system - controls electromagnetically driven proportional valve according to actual load pressure using electronic controller
DE19711595C2 (en) * 1997-03-20 2003-06-12 Draegerwerk Ag Method for controlling a valve in a ventilator

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056148A1 (en) * 1980-12-29 1982-07-21 Honeywell B.V. Respirator
EP0088864A3 (en) * 1982-03-16 1984-08-15 Carl A. Hoyer GmbH High-frequency artificial respiration apparatus
WO1986002565A1 (en) * 1984-11-01 1986-05-09 Bear Medical Systems, Inc. Electronically-controlled gas blending system
US4602653A (en) * 1984-11-01 1986-07-29 Bear Medical Systems, Inc. Electronically-controlled gas blending system
FR2573658A1 (en) * 1984-11-26 1986-05-30 Air Liquide Positive expiratory pressure device
US4874362A (en) * 1986-03-27 1989-10-17 Wiest Peter P Method and device for insufflating gas
EP0282675A2 (en) * 1986-11-04 1988-09-21 Bird Products Corporation Flow control valve for a medical ventilator
EP0282675A3 (en) * 1986-11-04 1990-01-03 Bird Products Corporation Flow control valve for a medical ventilator
EP0277526A2 (en) * 1987-01-31 1988-08-10 Drägerwerk Aktiengesellschaft Expansion valve with an adjustable output pressure
EP0277525A2 (en) * 1987-01-31 1988-08-10 Drägerwerk Aktiengesellschaft Expansion valve with an adjustable output pressure
EP0277525A3 (en) * 1987-01-31 1990-01-17 Drägerwerk Aktiengesellschaft Expansion valve with an adjustable output pressure
EP0277526A3 (en) * 1987-01-31 1990-01-17 Drägerwerk Aktiengesellschaft Expansion valve with an adjustable output pressure
US5474062A (en) * 1987-11-04 1995-12-12 Bird Products Corporation Medical ventilator
EP0483401A1 (en) * 1990-10-30 1992-05-06 Siemens Elema AB Device, e.g. a lung ventilator, for controlling a fluid flow, particularly a gas flow
US5265594A (en) * 1990-10-30 1993-11-30 Siemens Aktiengesellschaft Apparatus for regulating the flow-through amount of a flowing medium
WO2011000359A1 (en) * 2009-07-03 2011-01-06 F. Stephan Gmbh Medizintechnik Respiration device

Also Published As

Publication number Publication date
SE7906134A (en) 1980-01-18
DE2831312A1 (en) 1980-01-31
FR2431293A1 (en) 1980-02-15

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