WO1997001367A1 - Sac dans un systeme de chambre de pression destine a etre utilise dans un materiel d'anesthesie ou de reanimation - Google Patents

Sac dans un systeme de chambre de pression destine a etre utilise dans un materiel d'anesthesie ou de reanimation Download PDF

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Publication number
WO1997001367A1
WO1997001367A1 PCT/AU1996/000388 AU9600388W WO9701367A1 WO 1997001367 A1 WO1997001367 A1 WO 1997001367A1 AU 9600388 W AU9600388 W AU 9600388W WO 9701367 A1 WO9701367 A1 WO 9701367A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
unit
bottle
patient
chamber
Prior art date
Application number
PCT/AU1996/000388
Other languages
English (en)
Inventor
David Komesaroff
Rodney Westhorpe
Original Assignee
Techbase Pty. Ltd.
The Royal Childrens Hospital
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
Application filed by Techbase Pty. Ltd., The Royal Childrens Hospital filed Critical Techbase Pty. Ltd.
Priority to AU61159/96A priority Critical patent/AU6115996A/en
Publication of WO1997001367A1 publication Critical patent/WO1997001367A1/fr

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Classifications

    • 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. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A61M16/0078—Breathing bags
    • 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. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A61M16/0081—Bag or bellow in a bottle

Definitions

  • the present invention relates to bag in bottle arrangements for use as part of a ventilator breathing system for anaesthesia and resuscitation apparatus and in particular, bag in bottle arrangements that can be sterilised or have a single use application. Additionally, the present invention is in relation to components used in bag in bottle arrangements which are in contact with the patient and the ability to be able to use different types of bags and in particular either a concertina type bag or a smooth type bag. BACKGROUND OFTHE INVENTION
  • Ventilators enable automatic intermittent inflation of the patient's lungs with the gas by adding pressure to the circuit. Ventilators generally are used in association with a gas tight chamber enclosing either a concertina type bag or a smooth type bag (either of these are known as "the bag”). This arrangement is hereinafter for convenience, called the "bag in bottle”.
  • the concertina bag will be referred to as the "bellows”
  • the chamber will be referred to as the "bottle”
  • the conventional commonly used smooth rebreathing bag which may or may not be textured, will be referred to as the “smooth bag”.
  • the bottle is connected to a ventilator used to provide an external gas source and the interior of the bag is in direct contact with the patient breathing circuit.
  • the pressure within the bottle and outside the bag or bellows
  • the pressure in the bottle is reduced and the bellows or bag within the bottle expands by means of the elastic recoil of the patient's lungs.
  • the problem with the bag in bottle arrangement commonly used with conventional ventilators is that they can not easily be completely sterilised since they either cannot be readily dismantled or because some of the portions in contact with the patient are inaccessible.
  • the manifold or pipe connecting the bellows or bag arrangement to the patient circuit is often inextricably linked with the control mechanism of the ventilator means which controls the time for inspiration, the time for expiration and the flow rate of gas into the bottle.
  • the gas which is in contact with the patient, flows through the control mechanism to the bag.
  • control mechanism is either too bulky to sterilise or contains components which cannot be autoclaved due to the high temperatures achieved in the autoclaving process, the portions in contact with the patient are not sterilised in between uses which greatly increases the chances of disease transmission. In fact there may be long delays between sterilisation procedures.
  • the invention therefore provides in one aspect an integral unit for use in a bag in bottle arrangement of a ventilator system including an inlet/outlet means which in use, is connected with the patient's breathing circuit, a means to retain the bag in a gas tight manner and a means to seal the bottle or chamber in a gas tight manner.
  • a ventilator breathing unit for use in anaesthetic or resuscitation equipment for a patient
  • the ventilator unit including a breathing bag mounted within a chamber , the chamber being adapted to be connected to an external gas source, and the bag interior being adapted to be connected to the breathing circuit of a patient, the arrangement being such that variation of pressure in the chamber will cause the patient to inhale or exhale according to whether the pressure is increased or reduced respectively, wherein the bag is easily separably connected or disconnected in disposal of the breathing circuit, thereby enabling sterilisation or disposal of the parts after each patient treatment.
  • the means to retain the bag includes a bellows retaining disc to ensure that the shape of the bellows is maintained and preferably, the means for retaining the bag may also be a portion of the inlet/outlet means.
  • a smooth bag can be attached to the inlet/outlet means, thus advantageously enabling the use of either the bellows or smooth type bag. Additionally, this leads to a significant reduction in the costs associated with maintaining the ventilator in a sterile manner, since the smooth bags are significantly cheaper than the bellows and can thus be used as a single use item. Furthermore as a result of the present invention, maintaining the part of the bag and chamber combination in contact with the patient breathing circuit in a sterile manner is made significantly easier and cheaper because of the options available.
  • these options include, after each patient use, autoclaving the bellows bag and integral unit, autoclaving the smooth bag and integral unit, autoclaving the integral unit and replacing the smooth bag or bellows, or discarding a disposable integral unit fitted with a disposable bag or bellows.
  • Another aspect of the invention provides a retaining means for the chamber means which comprises an attachment means releasably attached to the chamber means and connects to a pivot means which may be pivotably supported. If a smooth bag is used it is essential to turn the bag in bottle arrangement upside down to ensure that the smooth bag will hang upside down and inflate unrestricted as required. Alternatively some professionals may prefer to use the bellows bag in this downward orientation. Additionally, this downward orientation of the invention advantageously enables easier access to the integral unit and thus the bag for removal and disposal and/or sterilisation.
  • the invention also provides a ventilator system for use in anaesthetic and resuscitation circuits comprising a ventilator control means, at least one bag in bottle arrangement wherein the bag in bottle arrangement has an integral unit comprising an inlet/outlet means which in use, is connected with the patient's breathing circuit, a means to retain the bag in a gas tight manner with the inlet/outlet means and a means to seal the bottle in a gas tight manner.
  • the invention further provides a bottle and bag arrangement for use in a ventilator system comprising at least one bottle and bag wherein the bottle and bag arrangement has an integral unit comprising an outlet means which in use, is connected with the patient's breathing circuit, a means to retain the bag in a gas tight manner with the inlet/outlet means and a means to seal the bottle in a gas tight manner.
  • the present invention provides a ventilator system, a bag in bottle arrangement and an integral unit for use in a bag in bottle arrangement of a ventilator which is very easy to dismantle and thus is conductive to sterilisation or disposal after each patient treatment to prevent the transmission of serious diseases.
  • the invention provides an integral unit and a bag in bottle arrangement that can be readily adapted for single use.
  • Figure 1 is a cross-sectional view of a preferred embodiment of the bag in bottle arrangement of the present invention wherein the bag in bottle arrangement is in the "upward" direction.
  • Figure 2 is a cross-sectional view of a preferred embodiment of the bag in bottle arrangement wherein the bag in bottle is in the "downward" direction.
  • Figure 3 is a cross-sectional view of a preferred embodiment of the integral unit of the present invention.
  • Figure 4 is a partial cross-sectional view of a preferred embodiment of the bag and bottle arrangement in the upward direction with an adjustable limiting means.
  • Figure 5 is an exploded view showing removal of the locking unit, integral unit and connected bag.
  • the bag in bottle arrangement designated 10 comprises the bottle portion 11 , and the bellows portion 30a or bag portion 30b.
  • the bottle portion 11 is made of transparent material so that the bellow portion 30a or bag portion 30b can be viewed.
  • the bottle portion 11 does not come in contact with gas from the patient breathing circuit and can be made of a non-sterilisable material.
  • guiding means 12 may be fixed to the inside wall of the bottle portion 11.
  • Such guide means 12 can run along the entire length of the bottle thus ensuring that the bellows bag 30a evenly inflates in the upwards or downwards direction.
  • the guide means 12 are strips or rods. Additionally, there are preferably more than three strips or rods positioned along the length of the bottle portion 11.
  • a disc means 31 may be affixed to the top of the bellows as illustrated, also an inner ring means 31a may be inserted inside the bellows, as illustrated, to further assist even inflation of the bellows.
  • The, integral unit 20, comprises an inlet/outlet means, with an external portion 21a, and an internal portion 21b.
  • the integral unit 20, further comprises a bellow retaining means 22, and sealing means 23. Both the bellow retaining means 22, and the sealing means 23, are preferably, disc shaped. More preferably, bellows retaining means 22, is a disc of smaller diameter than the disc of sealing means.
  • Bellows retaining means, 22, allows the fitment of bellows portion 30a in a gastight manner.
  • Internal inlet/outlet means, 21b allows the fitment of a smooth bag portion 30b in a gastight manner.
  • the external portion of inlet/outlet means 21a is connected to the patient breathing circuit.
  • the integral unit 20 may preferably include a valve means 25 for the venting of excess pressure from the patient circuit, thereby controlling pressure build up in the patient circuit as a result of constant gas flow.
  • the valve means 25 is adjustable between about 1cm to 5 cm H 2 O and acts to release excess gas from the patient circuit if the circuit pressure is above the set pressure at the end of expiration.
  • the integral unit 20 enables all portions in contact with the patient breathing circuit to be easily and quickly removed and sterilised or disposed of so that changeover between patient treatment is feasible and in fact easily achieved.
  • the integral gas inlet/outlet unit 20 is intended for repeated use then preferably the integral unit 20, is made from heat resistant material which can be repeatedly autoclaved such as heat resistant polycarbonate, steel, aluminium or other heat resistant material.
  • the unit 20, is for single use the unit can be made from plastics such as polystyrene or styreneacrylonitrile (SAN).
  • the integral unit 20, can be made in a number of pieces (as illustrated in Figures 1 and 2) or a single piece (as illustrated in Figure 3).
  • bellows retaining means, 22 allows the fitment of bellows portion 30a in a gastight manner and similarly the internal inlet/outlet means, 21a allows the fitment of smooth bag portion 30b in a gastight manner.
  • the present invention allows the interchangeable use of either the bellows or the alternative smooth type bag.
  • sealing plate, 23 ensures that when the bottle 11 , is under pressure and the locking means, which is preferably a plate, 14, is secured, the bottle maintains that pressure and does not leak.
  • An O-ring seal 45 may be provided on the flange 45 or plate 23, fixed in place to ensure a good seal.
  • Integral unit, 20 is held into place on the bottle 11, by locking member 14, which includes locking pins 14b adapted to secure in locking collar 42 preferably in a bayonet type fixture or partial thread fitting which enables a tightening of the connection to ensure sealing but easy connection and disconnection of the components.
  • the external portion of the inlet/outlet means, 21a is preferably a male/female taper fitting which is preferably straight but may also be elbow shaped (not shown).
  • the fitting 21a as illustrated in Figure 1 preferably includes a nipple protrusion, 24, for attachment of a hose line to connect to a respiratory pressure manometer (not shown) or can form a coaxial line which unit 61a is described in greater detail later.
  • the integral unit 20 may be rotated to a desired position by loosening the locking means 14 and then retightening. This is advantageous when the shape of the external portion of the inlet/outlet means, 21a, is elbow shaped.
  • a retaining means 40 which comprises an attachment means 41, connected to locking collar 44, a pivot means 42 and support means 43.
  • the retaining means 40 allows the bag in bottle arrangement 10, to be rotated about the pivot means 42, to a downward orientation which firstly, allows easier access to the integral unit, 20 and secondly allows the smooth bag, 30b, to hang freely thus ensuring that inflation is unrestricted.
  • a bellows bag may be fitted in this downward orientation.
  • Figure 1 illustrates the bag in bottle arrangement in the upward position.
  • Figure 2 illustrates the bag in bottle arrangement in the downward position.
  • the bellows 30a or more preferably the smooth bag 30b portion can be used in this downward position if required.
  • the bag in bottle arrangement may include the limiting means generally indicated 54, which as the name suggests, limits the extent to which the bellows type bag 30a can extend in the vertical direction.
  • the limiting means is preferably rod-shaped and is in contact directly or indirectly with the bellows 30a.
  • the adjustable limiting means 50 may also comprise a stopping means 51 , which is preferably disc-shaped and is in contact directly or indirectly via disc 31 attached to the bellows 30a, which is attached to a means which allows the fixing and adjustment of the position of the stopping means 51, in this case, spindle 52, passes through a locking means 53.
  • Locking means 53 can be unlocked or loosened to allow spindle 52 to move freely and once the desired height of the linking means 51 , is obtained then the locking means 53 can be locked or screwed.
  • This adjustable limiting mechanism allows the volume of the bellows 30a to be easily varied depending upon the size of the patient to which the ventilator is attached.
  • the bag in bottle arrangement 10 is attached to a ventilator control means (not shown), which can be any ventilator control means such as the Clare Ventilator, which in turn is connected to a gas source.
  • a ventilator control means can be any ventilator control means such as the Clare Ventilator, which in turn is connected to a gas source.
  • the inlet marked "driving gas inlet” is preferably connected by a co-axial hose 61a with a non-standard taper fitting control means (not shown).
  • the co-axial hose may be finished with a straight or elbow fitting.
  • the intemal hose 24a preferably exits the outer hose proximal to both ends and connects to the respiratory pressure manometer (not shown), and the nipple protrusion 24.
  • the intemal hose 24a may also be a separate external hose which connects to the respiratory pressure manometer (not shown) and the nipple protrusion 24.
  • Inlet/outlet means 21a and 21b is connected to the patient breathing circuit and is in contact with the patient's expired gases.
  • the driving gas from the ventilator control means is delivered into the bottle 11 , which pressurises the chamber causing compression of the bellows portion 30a or smooth bag portion 30b, which pushes the gas out of the bellows portion 30a or smooth bag portion 30b via inlet/outlet 21a and 21b, to the patient.
  • the gas from the patient flows back through inlet/outlet
  • the bag in bottle arrangement 10 (if not already in a downward orientation) can be rotated such that the locking plate 14 can be removed.
  • the integral unit 20 can be removed along with the bellows portion 30a or smooth bag portion 30b attached thereto within seconds.
  • the locking plate is easily removed simply by gripping slots 14a and turning through a part circle to release the locking pins 14b.
  • the entire assembly of the integral unit 20 and bag or bellows can be removed for sterilisation or disposal in a matter of seconds without the need for any tools.
  • the integral unit, 20 can then either be sterilised along with the bellows portion 30a or the smooth bag portion 30b, or disposed of, if it is a single-use component.
  • the bag in bottle arrangement 10 can be in the upward position (Figure 1) or downward position ( Figure 2). If a smooth bag, 30b, is used the preferable position is with the bag in bottle arrangement in a downward orientation as illustrated in Figure 2.
  • the present invention provides a bag in bottle arrangement which incorporates an integral unit offering the ability to use a bellows or a smooth bag.
  • the present invention provides a bag in bottle arrangement for use in an anaesthetic or resuscitation patient breathing circuit. Additionally, and advantageously the integral unit and the retained bellows or smooth bag can be easily and rapidly removed from the bag in bottle arrangement thus allowing regular sterilising or replacement with sterile disposable single use units, between patient treatments.
  • the risks of cross infection with the proposed invention will be greatly reduced and the costs associated with ensuring that the apparatus is sterile are also reduced significantly.
  • the invention enables the different types of bellows or smooth bags to be used in the most appropriate orientation whether this be upwards or downwards without losing any effectiveness in the function of the ventilator.

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  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Emergency Medicine (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)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Abstract

L'invention a pour objet un sac dans un appareil respiratoire à bouteille (10). Ce sac est prévu pour être utilisé dans un matériel d'anesthésie ou de réanimation. Cet appareil comprend un sac respiratoire (30b) fixé à l'intérieur d'une chambre (11) adaptée pour être reliée (61a) à une source de gaz externe. L'intérieur du sac est adapté pour être relié au circuit respiratoire d'un patient (21a, 21b). Le système est tel que la variation de pression dans la chambre amène le patient à inspirer ou expirer selon que la pression est augmentée ou diminuée respectivement. Le sac peut être aisément relié, de manière libérable, au circuit respiratoire (22), ce qui facilite la stérilisation ou la mise au rebut des éléments après chaque traitement. L'appareil respiratoire peut être déplacé entre deux emplacements de fonctionnement, diamètralement opposés, lorsque le sac est suspendu à l'ensemble ou se projette verticalement vers le haut à partir de celui-ci. Le sac peut être un soufflet (30a) ou un type de sac lisse (30b) dans le même appareil respiratoire. L'ensemble peut être facilement démonté et assemblé sans nécessiter d'outils.
PCT/AU1996/000388 1995-06-26 1996-06-26 Sac dans un systeme de chambre de pression destine a etre utilise dans un materiel d'anesthesie ou de reanimation WO1997001367A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61159/96A AU6115996A (en) 1995-06-26 1996-06-26 Bag in pressure chamber arrangement for use in anaesthesia ad resuscitation apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPN3811A AUPN381195A0 (en) 1995-06-26 1995-06-26 Bag in pressure chamber arrangement for use in anaesthesia and resuscitation apparatus
AUPN3811 1995-06-26

Publications (1)

Publication Number Publication Date
WO1997001367A1 true WO1997001367A1 (fr) 1997-01-16

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PCT/AU1996/000388 WO1997001367A1 (fr) 1995-06-26 1996-06-26 Sac dans un systeme de chambre de pression destine a etre utilise dans un materiel d'anesthesie ou de reanimation

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AU (1) AUPN381195A0 (fr)
WO (1) WO1997001367A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999062581A2 (fr) * 1998-06-01 1999-12-09 Axon Medical, Inc. Systeme clos de reinhalation permettant de conserver les memes dosages lors d'une ventilation par liquide
US6263873B1 (en) 1998-02-25 2001-07-24 Siemens-Elema Ab Bellows arrangement for a ventilator/anesthesia system
FR2806919A1 (fr) * 2000-04-04 2001-10-05 Taema Appareil d'anesthesie respiratoire a dispositif d'accumulation de gaz unique
WO2003099364A1 (fr) * 2002-05-23 2003-12-04 Art Of Xen Limited Systeme d'alimentation de gaz
WO2009032932A1 (fr) * 2007-09-07 2009-03-12 Galemed Corporation Ensemble de sac de réanimation manuelle à volume réglable
CN104874075A (zh) * 2014-02-28 2015-09-02 北京谊安医疗系统股份有限公司 折叠囊和具有它的麻醉机
CN105498064A (zh) * 2015-12-31 2016-04-20 深圳市诺然美泰科技有限公司 容积可变的风箱装置、其使用方法及麻醉机呼吸回路

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582210A (en) * 1949-07-05 1952-01-08 E & J Mfg Co Apparatus for positive respiration during gas anesthesia
US2766753A (en) * 1954-04-15 1956-10-16 Dragerwerk Fa Apparatus for artificial respiration, in particular for purposes of anesthesia
US3046979A (en) * 1958-12-05 1962-07-31 Air Shields Lung ventilators and control mechanism therefor
US3467092A (en) * 1966-12-14 1969-09-16 Bird F M Anesthesia apparatus and resuscitator
GB1374581A (en) * 1970-10-17 1974-11-20 Cape Eng Co Ltd Apparatus for administering gas to a patient
US3859997A (en) * 1971-09-30 1975-01-14 Becton Dickinson Co Reservoir bag for anesthesiology
US4014326A (en) * 1975-04-30 1977-03-29 Cameco Ab Respirator system
US4148312A (en) * 1976-10-08 1979-04-10 Minnesota Mining And Manufacturing Company Combination anesthesia and intensive care apparatus
US4192301A (en) * 1978-11-06 1980-03-11 Hardwick Charles W Re-breathing apparatus
EP0557134A1 (fr) * 1992-02-21 1993-08-25 Instrumentarium Corporation Régulation du débit d'un gaz sous pression
JPH07215291A (ja) * 1994-02-03 1995-08-15 Grand Blue:Kk 半閉鎖式呼吸装置のエアーバッグ

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582210A (en) * 1949-07-05 1952-01-08 E & J Mfg Co Apparatus for positive respiration during gas anesthesia
US2766753A (en) * 1954-04-15 1956-10-16 Dragerwerk Fa Apparatus for artificial respiration, in particular for purposes of anesthesia
US3046979A (en) * 1958-12-05 1962-07-31 Air Shields Lung ventilators and control mechanism therefor
US3467092A (en) * 1966-12-14 1969-09-16 Bird F M Anesthesia apparatus and resuscitator
GB1374581A (en) * 1970-10-17 1974-11-20 Cape Eng Co Ltd Apparatus for administering gas to a patient
US3859997A (en) * 1971-09-30 1975-01-14 Becton Dickinson Co Reservoir bag for anesthesiology
US4014326A (en) * 1975-04-30 1977-03-29 Cameco Ab Respirator system
US4148312A (en) * 1976-10-08 1979-04-10 Minnesota Mining And Manufacturing Company Combination anesthesia and intensive care apparatus
US4192301A (en) * 1978-11-06 1980-03-11 Hardwick Charles W Re-breathing apparatus
EP0557134A1 (fr) * 1992-02-21 1993-08-25 Instrumentarium Corporation Régulation du débit d'un gaz sous pression
JPH07215291A (ja) * 1994-02-03 1995-08-15 Grand Blue:Kk 半閉鎖式呼吸装置のエアーバッグ

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6263873B1 (en) 1998-02-25 2001-07-24 Siemens-Elema Ab Bellows arrangement for a ventilator/anesthesia system
WO1999062581A2 (fr) * 1998-06-01 1999-12-09 Axon Medical, Inc. Systeme clos de reinhalation permettant de conserver les memes dosages lors d'une ventilation par liquide
WO1999062581A3 (fr) * 1998-06-01 2000-03-09 Axon Medical Inc Systeme clos de reinhalation permettant de conserver les memes dosages lors d'une ventilation par liquide
FR2806919A1 (fr) * 2000-04-04 2001-10-05 Taema Appareil d'anesthesie respiratoire a dispositif d'accumulation de gaz unique
WO2003099364A1 (fr) * 2002-05-23 2003-12-04 Art Of Xen Limited Systeme d'alimentation de gaz
WO2009032932A1 (fr) * 2007-09-07 2009-03-12 Galemed Corporation Ensemble de sac de réanimation manuelle à volume réglable
US8443804B2 (en) 2007-09-07 2013-05-21 Galerned Corporation Adjustable volume manual resuscitation bag assembly
CN104874075A (zh) * 2014-02-28 2015-09-02 北京谊安医疗系统股份有限公司 折叠囊和具有它的麻醉机
CN105498064A (zh) * 2015-12-31 2016-04-20 深圳市诺然美泰科技有限公司 容积可变的风箱装置、其使用方法及麻醉机呼吸回路

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