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US3789837A - Automatic therapeutic ventilator - Google Patents

Automatic therapeutic ventilator Download PDF

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Publication number
US3789837A
US3789837A US00097279A US3789837DA US3789837A US 3789837 A US3789837 A US 3789837A US 00097279 A US00097279 A US 00097279A US 3789837D A US3789837D A US 3789837DA US 3789837 A US3789837 A US 3789837A
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Prior art keywords
oxygen
bellows
breathing mixture
period
tray
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Expired - Lifetime
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US00097279A
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English (en)
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W Philips
J Liddall
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A61M16/0081—Bag or bellow in a bottle
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes operated by electrical means
    • A61M16/022—Control means therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • A61M16/202—Controlled valves electrically actuated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • A61M16/202—Controlled valves electrically actuated
    • A61M16/203—Proportional
    • A61M16/204—Proportional used for inhalation control
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • A61M16/202—Controlled valves electrically actuated
    • A61M16/203—Proportional
    • A61M16/205—Proportional used for exhalation control
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • A61M16/206—Capsule valves, e.g. mushroom, membrane valves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/0051—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes with alarm devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A61M16/0075—Bellows-type
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A61M16/0816—Joints or connectors
    • A61M16/0833—T- or Y-type connectors, e.g. Y-piece
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A61M16/0816—Joints or connectors
    • A61M16/0841—Joints or connectors for sampling
    • A61M16/0858—Pressure sampling ports
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/105—Filters
    • A61M16/106—Filters in a path
    • A61M16/107—Filters in a path in the inspiratory path
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/18—Vaporising devices for anaesthetic preparations
    • A61M16/186—Locking systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/86131—Plural
    • Y10T137/86163—Parallel

Definitions

  • the present invention provides a relatively small, simple and compact automatic therapeutic ventilator which is readily dismantled and affords a visual inspection of its operation.
  • Oxygen is fed into a bellows which is expanded until a predetermined volume of oxygen is collected.
  • This oxygen is then passed from the oxygen bellows into a further bellows which collects the oxygen and contemporaneously inspires a predetermined volume of air so that the air and oxygen mix thereby creating a breathing mixture.
  • a casing around the bellows is filled with compressed air to collapse the bellows and force the breathing mixture through a humidifier to the patient.
  • the breathing mixture bellows and oxygen bellows are visible to the operator so that he has an immediate visible indication of the operation of the ventilator as well as an indication of the relative volumes of oxygen and air in the breathing mixture.
  • the present invention provides an automatic therapeutic ventilator having adjustable electrical timers for controlling inhalation and exhalation periods such that the exhalation period is substantially equal to or greater than the inhalation period.
  • FIG. 5 is an exploded perspective view of an automatic therapeutic ventilator built according to the invention.
  • the invention falls into three parts.
  • a first part is a pneumatic circuit which receives air and oxygen, mixes the air and oxygen to form a breathing mixture and then forces the mixture through a humidifying device to the patient. Exhaled breath from the patient is collected in a spirometer.
  • a second part is a control circuit for timing and sequentially operating the pneumatic circuit, and a third part is a structural embodiment of the pneumatic circuit. The three parts will be described in the order in which they were introduced.
  • the third part of the pneumatic circuit namely that part containing compressed air.
  • the patient must alternatively receive breathing mixture and exhale his breath.
  • the bellows 78 must be collapsed by the compressed air once every cycle.
  • the compressed air must be applied to poppet valve 132 and valve assembly 98 to control these valves.
  • Compressed air entering the pressure control pipe 170 must first pass through a one-way valve 178 which prevents flow in a direction from pipe 170 into pipes 172 and 166.
  • An orifice assembly 180 is coupled to pipe 170 for bleeding compressed air from pipe 170.
  • the assembly 180 includes a main branch pipe 182 feeding an adjustable orifice 184 and a fixed orifice 186.
  • a secondary branch pipe 188 feeds a further fixed orifice 190.
  • the arrangement of the orifices 184, 186 and 190 is such that if the adjustable orifice 184 is closed, then the rate of pressure bleeding from pipe 170 is fixed by the orifice 190. if the orifice 184 is fully open, the rate is fixed by the combined effect of orifices 186 and 190. At any position between fully open and fully closed, the orifice 184 has the effect of providing an adjustable rate of pressure bleed from pipe 170.
  • the electrical timing circuit which will be described later, incorporates a circuit for connection to the solenoid valve 162 in the bypass pipe 160. At intervals selected by the operator and timed electrically, solenoid valve 162 will open with the solenoid valves 46 and 140 to thereby permit an extra charge of compressed air to pass around the bypass pipe 160. This results in collapsing the bellows 78 further than it is collapsed for a normal breath so that the patient receives an extra charge of breathing mixture.
  • valves shown in FIG. 2 reduces the loss of oxygen and compressed air when compared with the FIG. 1 circuit. Further, when compressed air is needed to collapse the bellows 78 in the embodiment shown in FIG. I there was a loss of compressed air because it was bleeding through orifice 176, through orifice assembly 180, and through orifice 156. In the FIG.
  • FIG. 3 shows an electrical circuit suitable for controlling the pneumatic circuit shown in FIG. 1.
  • the electrical circuit is required to open and close the solenoid valves 46, 140 and 162 at predetermined intervals in a breathing cycle. Once the solenoid valves have been opened, the compressed air supply and the oxygen supply are applied to the pneumatic circuit as previously described.
  • sub-circuits are: a cycle timer circuit which is adjustable for controlling both the inhalation period during which breathing mixture is supplied to the patient, and the exhalation period during which the patient exhales; a pressure control circuit which can be adjusted to set the upper and lower pressure limits of the pneumatic cycle as applied to the patient; a sigh circuit which is adjustable for controlling the time between sighs and is adapted to periodically activate solenoid valve 162 (FIG. 1) at an instant when the solenoid valve is activated; an alarm circuit for indicating low oxygen pressure, prolonged low pressure at the tube 40 (FIG. 1), and excessive breathing mixture pressure; and a power fail alarm circuit which indicates to the user that the power supply to the main circuit has failed.
  • the sub-circuits will be described in the order in which they were introduced, i.e., from left to right of FIG. 3.
  • Each part can selectively connect a respective centre contact to one of three outer contacts.
  • the upper of the three contacts indicates connection to a fully automatic cycle
  • the intermediate contact indicates connection to a semi-automatic cycle
  • the lower contact indicates connection to a cycle triggered by the patient.
  • the switch parts 226, 232 are in the automatic" position so that the cycle timer circuit will control the inhalation and exhalation periods.
  • the sigh circuit will be described. Power for the sigh circuit is drawn through the selector switch fifth part 238 which is arranged so that the sigh circuit will be operational when the switch is in either the automatic or semi-automatic" positions. The sigh circuit is isolated when the selector switch is in the patient triggered position.
  • a central portion of the diaphragm 516 is trapped between the limit bar 514 and the nut 518, and the periphery of the diaphragm is trapped between an upper frame member 520 on the underside of tray 356 and a block 522.
  • the poppet valve 494 With the poppet valve 494 open, exhaled breath is free to pass through opening 508 and escape past frame member 520.
  • the poppet valve 494 is held in the open position by compressed air applied through pipe 496 and duct 524 below diaphragm 516.
  • An orifice 526 leads from duct 524 to atmosphere for bleeding pressure from below diaphragm 516 as previously described with reference to FIG. 1.
  • pressure in duct 524 and below diaphragm 516 bleeds through orifice 526 and the poppet valve 494 closes.
  • the breathing control valve assembly 468 is a friction fit on the respective ends 490, 486 of connecting tube 488 and humidifier outlet conduit 466.
  • the construction of valve assembly 468 will be described with reference to FIG. 7.
  • a breathing mixture outlet conduit 568 and an exhalation input tube 570 extend from the valve assembly 468 to a Y-connector 572 connecting the conduit 568 and tube 570 to a tube 574.
  • a trachael tube 576 is attached to end of tube 574 for insertion into a trachael incision in the patient and branch pipe 578 is connected to the Y-connector for relaying pressure changes to a pressure sensing device 580 which would in practice be within the base 332 but which is shown separately for clarity of drawing.
  • the device 580 is associated with the pressure control circuit shown in FIG. 3.
  • the base 332 includes a control panel 582 on which the controls described with reference to FIGS. 1 and 3 are located.
  • the controls are simply numbered according to the numerals they carried in FIGS. 1 and 3.
  • Flap valve 492 has a flexible member 648 covering an opening 650 in tray 356 for receiving exhaled breath from connecting tube 488.
  • the member 648 is held in place by two studs 652 of similar shape and function to studs 638 (FIG. 10).
  • the sigh is obtained by extending the inhalation period using the FIG. 4 electrical circuit.
  • the ganged potentiometers r4, r5 are turned to zero so that they have no affect on the inhalation period.
  • Switch 248 (FIG. 3) is then closed and potentiometers r4,r5 turned to introduce their respective resistances into the timing circuits. The effect of this is again evident on the pressure meter and bellows scales and once a suitable sigh has been developed, the switch 248 is released and the period between sighs is set on potentiometer r3 (FIG.3) as previously described.
  • oxygen control valve means operably coupled to the oxygen bellows to permit said pressurized oxygen to flow into the oxygen bellows during an inhalation period until the oxygen bellows contains said predetermined volume, and to permit said volume of oxygen to flow from said oxygen bellows into said breathing mixture bellows during said exhalation period;

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  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
US00097279A 1970-12-11 1970-12-11 Automatic therapeutic ventilator Expired - Lifetime US3789837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9727970A 1970-12-11 1970-12-11

Publications (1)

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US3789837A true US3789837A (en) 1974-02-05

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US (1) US3789837A (it)
AU (1) AU3675771A (it)
DE (1) DE2160763A1 (it)
FR (1) FR2117657A5 (it)
GB (1) GB1351326A (it)
IL (1) IL38331A0 (it)
IT (1) IT951666B (it)
NL (1) NL7117022A (it)
SE (1) SE7115852L (it)
ZA (1) ZA718238B (it)

Cited By (36)

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US3923053A (en) * 1974-07-29 1975-12-02 David Guild Jansson Respiratory protective device
WO1981002677A1 (en) * 1980-03-20 1981-10-01 Berkshire Res Partners Volume ventilator
WO1982004386A1 (en) * 1981-06-12 1982-12-23 Technology Survival Plural station resuscitator
US4391271A (en) * 1981-04-06 1983-07-05 Albert Blanco Respirator circuit
US4589409A (en) * 1983-10-28 1986-05-20 Chatburn Robert L Heat and humidification system for high frequency jet ventilation
US4603691A (en) * 1984-12-24 1986-08-05 Tibor Rusz Pulmonary ventilator-bellows-assembly kit
US4727871A (en) * 1985-10-28 1988-03-01 Infrasonics, Inc. Ventilator exhalation system
US5645052A (en) * 1991-04-26 1997-07-08 The Boc Group Plc Anaesthetic vaporizer with expandable/contractable reservoir for pumping liquid anaesthetic
US5769072A (en) * 1995-03-20 1998-06-23 Siemens Elema Ab Anesthetic system with multiple valve-controlled bellows
US5979443A (en) * 1995-06-08 1999-11-09 University Of Wales College Of Medicine Closed ventilation/anesthesia apparatus
US6250302B1 (en) * 1997-11-05 2001-06-26 Instrumentarium Corp. Method and arrangement in connection with ventilator
WO2002033269A2 (en) * 2000-10-18 2002-04-25 Oxygen Lifeline, Llc Personal gas supply delivery system
US6631717B1 (en) * 1999-10-21 2003-10-14 Ntc Technology Inc. Re-breathing apparatus for non-invasive cardiac output, method of operation, and ventilator circuit so equipped
US20060201507A1 (en) * 2002-10-11 2006-09-14 The Regents Of The University Of California Stand-alone circle circuit with co2 absorption and sensitive spirometry for measurement of pulmonary uptake
US20060278227A1 (en) * 2005-06-08 2006-12-14 Imi Norgren, Inc. Ventilator system
WO2009001155A1 (es) * 2007-06-27 2008-12-31 Centro Medico Imbanaco De Cali S.A. Mezclador automático de autorregulación de oxigeno con monitoreo no invasivo por pulsoximetria
US20110073109A1 (en) * 1999-08-05 2011-03-31 Map Medizin-Technologie Gmbh Apparatus for humidifying a respiratory gas
CN103736181A (zh) * 2013-12-12 2014-04-23 科迈（常州）电子有限公司 呼吸机
US8844526B2 (en) 2012-03-30 2014-09-30 Covidien Lp Methods and systems for triggering with unknown base flow
US9364624B2 (en) 2011-12-07 2016-06-14 Covidien Lp Methods and systems for adaptive base flow
US9498589B2 (en) 2011-12-31 2016-11-22 Covidien Lp Methods and systems for adaptive base flow and leak compensation
US9649458B2 (en) 2008-09-30 2017-05-16 Covidien Lp Breathing assistance system with multiple pressure sensors
US9808591B2 (en) 2014-08-15 2017-11-07 Covidien Lp Methods and systems for breath delivery synchronization
US9925346B2 (en) 2015-01-20 2018-03-27 Covidien Lp Systems and methods for ventilation with unknown exhalation flow
US9950129B2 (en) 2014-10-27 2018-04-24 Covidien Lp Ventilation triggering using change-point detection
US9981096B2 (en) 2013-03-13 2018-05-29 Covidien Lp Methods and systems for triggering with unknown inspiratory flow
US20180200473A1 (en) * 2017-01-13 2018-07-19 Cooling Electronics Co., Limited Electronic control circuit for alleviating altitude sickness and oxygen supply device
US10105509B2 (en) * 2015-03-24 2018-10-23 Ventec Life Systems, Inc. Active exhalation valve
US10293125B2 (en) 2003-06-20 2019-05-21 Resmed Limited Flow generator with patient reminder
US10773049B2 (en) 2016-06-21 2020-09-15 Ventec Life Systems, Inc. Cough-assist systems with humidifier bypass
US10820977B2 (en) * 2016-08-01 2020-11-03 Sechrist Industries, Inc. Method and apparatus for administering supplemental oxygen therapy at ambient conditions using a veterinary hyperbaric chamber
US11191915B2 (en) 2018-05-13 2021-12-07 Ventec Life Systems, Inc. Portable medical ventilator system using portable oxygen concentrators
WO2022026697A1 (en) * 2020-07-31 2022-02-03 Soco International Llc Respiratory ventilator device and method of operating same
US11247015B2 (en) 2015-03-24 2022-02-15 Ventec Life Systems, Inc. Ventilator with integrated oxygen production
US11291786B2 (en) * 2014-03-11 2022-04-05 Koninklijke Philips N.V. Reducing hypercapnic respiratory failure during mechanical ventilation
US11324954B2 (en) 2019-06-28 2022-05-10 Covidien Lp Achieving smooth breathing by modified bilateral phrenic nerve pacing

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DE19640113C1 (de) * 1996-09-28 1997-10-30 Draegerwerk Ag Beatmungsgerät
CN104096302B (zh) * 2014-07-15 2016-01-20 大连大学 便携式恒温抑菌增湿智能控制的组合吸氧装置
CN112891693B (zh) * 2021-03-05 2022-09-27 山西白求恩医院(山西医学科学院) 一种外科手术用具有气体自动加湿功能的麻醉机

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US2924215A (en) * 1958-01-22 1960-02-09 Stephenson Corp Double bellows controlled respiration unit
US3046979A (en) * 1958-12-05 1962-07-31 Air Shields Lung ventilators and control mechanism therefor
US3058460A (en) * 1957-01-08 1962-10-16 Stephenson Corp Method and apparatus for supplying and exhausting or exchanging a controlled volume of gas
US3467078A (en) * 1965-05-10 1969-09-16 Bird F M Spirometer
US3515134A (en) * 1967-12-28 1970-06-02 John R Potrafka Volumetric control device for positive pressure breathing machines
US3548821A (en) * 1967-08-23 1970-12-22 Vladmir Spiridonovich Gigauri Apparatus for artificial ventilation of lungs
US3556095A (en) * 1969-02-13 1971-01-19 Us Army Automatic intermittent positive pressure ventilator

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Publication number Publication date
FR2117657A5 (it) 1972-07-21
ZA718238B (en) 1973-04-25
IT951666B (it) 1973-07-10
GB1351326A (en) 1974-04-24
DE2160763A1 (de) 1972-06-22
AU3675771A (en) 1973-06-14
IL38331A0 (en) 1972-02-29
SE7115852L (sv) 1972-06-12
NL7117022A (it) 1972-06-13

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