US3850171A - Medical face masks - Google Patents

Medical face masks Download PDF

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Publication number
US3850171A
US3850171A US36078873A US3850171A US 3850171 A US3850171 A US 3850171A US 36078873 A US36078873 A US 36078873A US 3850171 A US3850171 A US 3850171A
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Prior art keywords
apertures
member
apertured
face mask
inlet
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Expired - Lifetime
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G Ball
I Fehr
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Vickers Ltd
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Vickers Ltd
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    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • 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
    • A61M16/06Respiratory or anaesthetic masks
    • 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
    • A61M16/10Preparation of respiratory gases or vapours
    • A61M16/12Preparation of respiratory gases or vapours by mixing different gases
    • A61M16/122Preparation of respiratory gases or vapours by mixing different gases with dilution
    • A61M16/125Diluting primary gas with ambient air
    • A61M16/127Diluting primary gas with ambient air by Venturi effect, i.e. entrainment mixers

Abstract

A medical face mask for supplying gas/air mixture to a patient comprising a hollow body portion adapted to cover the nose and mouth of the patient and an inlet portion for adjustably supplying said gas/air mixture. The body portion includes an inlet opening and at least one outlet. The inlet portion of the mask comprises a venturi throat in communication with the inlet opening in the body portion and includes first and second apertured members, said second member is mounted to the inlet portion and has a plurality of apertures and a gas inlet means. Said first member is rotatably mounted to said second member and has a plurality of apertures adapted for the selective registry with said apertures in said second member.

Description

United States Patent [191 Ball et al.

[451 Nov. 26, 1974 MEDICAL FACE MASKS [75] Inventors: Graham John Ball; Ivor John Martin Fehr, both of Basingstoke, England [73] Assignee: Vickers Limited, London, England [22] Filed: May 16, 1973 [21] Appl. No.: 360,788

[52] US. Cl. 128/203, 128/145.8 [51] Int. Cl A62b 7/02 [58] Field of Search 128/203, 196, 195, 197, 128/199, 200, 205, 209, 210, 142.3, 145.5, 145.8

[56] References Cited UNITED STATES PATENTS 733,026 7/1903 Goldan 128/209 2,508,050 5/1950 Valente 128/205 2,645,223 7/1953 Lawshe et a1 128/173 H 3,186,407 6/1965 Morrison 128/203 3,717,147 2/1973 Flynn 128/145.8

FOREIGN PATENTS OR APPLICATIONS 471,385 5/1927 Germany 128/203 Primary Examiner-Richard A. Gaudet Assistant Examiner-Henry J. Recla Attorney, Agent, or Firm-Thomas C. Wettach; Arland T. Stein [5 7 ABSTRACT A medical face mask for supplying gas/air mixture to a patient comprising a hollow body portion adapted to cover the nose and mouth of the patient and an inlet portion for adjustably supplying said gas/air mixture. The body portion includes an inlet opening and at least one outlet. The inlet portion of the mask comprises a venturi throat in communication with the inlet opening in the body portion and includes first and sec- -ond apertured members, said second member is mounted to the inlet portion and has a plurality of apertures and a gas inlet means. Said first member is rotatably mounted to said second member and has a plurality of apertures adapted for the selective registry with said apertures in said second member.

5 Claims, 4 Drawing Figures PAH-INTEL HUVZ 61974 SHEET 10F 2 3.850.171 SHEET 20F 2 PATENTEL HUV 26 I974 MEDICAL FACE MASKS For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:

FIG. 1 is a front perspective view of a medical face mask,

FIG. 2 is a side view of the mask of FIG. 1 illustrating the various gaseous flows that occur in use, and

FIGS. 3 and 4 are front views of details of the mask of FIGS. 1 and 2.

The mask of the Figures has a hollow body portion 1 formed of a translucent pliable plastics material. The body portion 1 is of appropriate configuration to be fittable to a patients face so as to contain the nose and mouth, the mask being fitted to the patient utilising an elastic cord secured to holes 2 in lugs 3 extending from the rim portion 4 of the body portion 1, this rim portion 4 extending laterally of the remainder of the body portion 1 to facilitate close fitting of the mask to the patients face.

An inlet portion 5 of the mask is formed by a rigid tube 6 that extends from the body portion 1. A disk 7 is fast in the tube 6 at its free end, that is at its end remote from the body portion 1. An inlet jet 8 rigid with the disk 7 extends through the centre of the disk 7 such that a venturi throat exists at the free end of the tube 6. A further disk 9 is rotatably mounted on the jet 8 outside the tube 6, this disk 9 being urged into face to face contact with the disk 7 by a compression spring 10 mounted on the jet 8 and acting between the disk 9 and a shoulder 11 on the jet 8. The outer end of the jet 8 is formed for having connected to it a gas supply pipe.

The two co-operating disks 7 and 9 constitute air inlet means positioned to permit air to be drawn into the mask by the action of gas entering the mask through the venturi throat. To this end, and referring to FIGS. 3 and 4, the disks 7 and 9 are apertured. The disk 7 has four apertures A, B, C and D, equi-angularly spaced-apart on the same pitch circle diameter but of different diameters. In the illustrated example shown the diameters are A 0.1470 inch, B 0.2130 inch, C 0.2130 inch and D 0.28125 inch spaced at 60 apart on a pitch circle diameter of inch. The disk 9 has four corresponding apertures a, b, c and d which, in one position of the disk 9 relative to the disk 7, align with the apertures A, B, C and D respectively. To ensure that air flow through the apertures that are in line with one another is, in most positions of the disk 9 relative to the disk 7, determined by the sizes of the apertures A, B, C and D, the apertures b, c and d are each of slightly larger diameter than the corresponding apertures B, C or D. In the illustrated example a 0.1285 inch, b 0.234375 inch, c 0.28125 inch and d 0.34375 inch in diameter.

In addition to the apertures A, B, C and D the disk 7 is provided with a pip 12 directed towards the disk 9 and disposed on the same pitch circle diameter as the apertures A, B, C and D for engagement with either one of two closed bores 13, 14 in the disk 9 on the same pitch circle diameter as the apertures a, b, c and d and equi-angularly spaced apart therefrom and from each other. In the illustrated example the pip 12 is 0.125 inch in diameter and the bores l3, 14 are each 0.134

inch in diameter. The pip 12 can alternatively be engaged in the aperture a or in the aperture b as discussed below.

The mask is used as follows. The particular example illustrated is intended to have its jet 8 connected to an oxygen source supplying oxygen at a flow rate within the range of 8 to 14 litres per minute, and to operate within acceptable limits up to a flow rate of 19 litres per minute. Oxygen entering the mask through the jet 8 (dotted lines 15 in FIG. 2) causes air to be drawn in through whichever of the apertures in the two disks 7 and 9 are in alignment (chain dot lines 16). The thus oxygen-enriched air enters the mask body portion I to be inhaled by the patient. The length and inner diameter of the tube 6, and the diameter of the orifice of the jet 8, are such that the jet of oxygen entering the tube 6 breaks up within the tube 6 before entering the body portion 1 and the resultant turbulent gas flows within the tube 6 (illustrated in FIG. 2) prevent oxygen not inhaled by the patient, and exhaled air, re-entering the tube 6..The excess oxygen and exhaled air is permitted to leave the mask through apertures 17 in the mask body 1 (chain lines 18). In this illustrated example the t bsfiis 3% n s IQ L 'QLitEE EA aL ELqLS 1 in aildthe jet orifice is 0.144 inch in diameter.

The desired oxygen concentration in the gas stream entering the mask body portion 1 is selected by adjusting the position of the disk 9 relative to the disk 7, percentage concentrations of percent, percent, percent and percent, within i 1 percent at oxygen flow rates of from 8 litres per minute to 14 litres per minute being obtainable with the illustrated mask by setting the disk 9 as follows:

Pip l2 engaged in bore 13, apertures a, b, c and d respectively aligned with apertures A, B, C and D 50 percent oxygen concentration.

Pip l2 engaged in bore 14, apertures b, c and d respectively aligned with apertures A, B and C, apertures a and D blanked off 60 percent oxygen concentration.

Pip 12 engaged in aperture a (blanking this aperture off), apertures c and d aligned with apertures A and B, apertures b, C and D'also blanked off 70 percent oxygen concentration.

Pip l2 engaged in aperture b (blanked off), apertures a and d aligned with apertures D and A, apertures c, B and C also blanked off 80 percent oxygen concentration.

In the last position (80 percent oxygen concentration), although the pip 12 is a very loose fit in the aperture b, the relative sizes of the apertures a and D and d and A are such that the apertures A and a are always open throughout the range of movement permitted to the disk 9 in this position.

It will be appreciated that the various settings described above are obtained by positive locations of the pip 12 in either the bore 13, the bore 14, the aperture a or the aperture b, the setting being altered by withdrawing the disk 9 against the action of the spring 10,

rotating the disk 9 and releasing it again. Appropriate scale markings carried by the disk 9 line up with a fiducial line on the disk 7 for each of these settings.

We claim:

1. A medical face mask comprising a hollow body portion adapted to fit over the nose and mouth of a patient, said body portion having an inlet opening and at least one outlet opening, and an inlet portion including a venturi throat in communication with said inlet opening and having first and second apertured members, said second apertured member being fast with said inlet portion and including a plurality of apertured, said second aperture member including gas inlet means for introduction of a gas into said venturi throat, and said first apertured member being rotatably mounted to said second apertured member'and including a plurality of apertures adapted for registry with selected apertures of said second member to permit selectable amounts of air into said venturi throat.

2. A medical face mask as set forth in claim 1 wherein said apertures in each of said first and second members are disposed on a common pitch circle, said circles each being coaxial about the axis of rotation of said first apertured member and of the same radius as the other.

3. A medical face mask as set forth in claim 1 wherein said first aperture member is rotatably mounted to said gas inlet means, and said gas inlet means-including biasing means for biasing said first member against said second member.

4. A medical face mask as set forth in claim 1 wherein said second aperture member includes at least apertures A, B, C and D and first aperture member includes at least corresponding apertures a, b, c and d, each of said apertures having centers positioned on corresponding pitch circles of the same diameter and said centers being positioned about 60 apart.

5. A medical face mask as set forth in claim 4 wherein apertures b, c and d are each slightly larger than corresponding apertures B, C and D and where the diameters of said apertures are related as follows:

Claims (5)

1. A medical face mask comprising a hollow body portion adapted to fit over the nose and mouth of a patient, said body portion having an inlet opening and at least one outlet opening, and an inlet portion including a venturi throat in communication with said inlet opening and having first and second apertured members, said second apertured member being fast with said inlet portion and including a plurality of apertured, said second aperture member including gas inlet means for introduction of a gas into said venturi throat, and said first apertured member being rotatably mounted to said second apertured member and including a plurality of apertures adapted for registry with selected apertures of said second member to permit selectable amounts of air into said venturi throat.
2. A medical face mask as set forth in claim 1 wherein said apertures in each of said first and second members are disposed on a common pitch circle, said circles each being coaxial about the axis of rotation of said first apertured member and of the same radius as the other.
3. A medical face mask as set forth in claim 1 wherein said first aperture member is rotatably mounted to said gas inlet means, and said gas inlet means including biasing means for biasing said first member against said second member.
4. A medical face mask as set forth in claim 1 wherein said second aperture member includes at least apertures A, B, C and D and first aperture member includes at least corresponding apertures a, b, c and d, each of said apertures having centers positioned on corresponding pitch circles of the same diameter and said centers being positioned about 60* apart.
5. A medical face mask as set forth in claim 4 wherein apertures b, c and d are each slightly larger than corresponding apertures B, C and D and where the diameters of said apertures are related as follows: A<B C<D and a<b<c<d.
US36078873 1973-05-16 1973-05-16 Medical face masks Expired - Lifetime US3850171A (en)

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Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977432A (en) * 1975-01-13 1976-08-31 American Hospital Supply Corporation Breathing mask and variable concentration oxygen diluting device therefor
US3995625A (en) * 1973-10-18 1976-12-07 Cyprane Limited Inhalation devices
US4022202A (en) * 1975-01-17 1977-05-10 William Edward Price Resuscitator inhalator oxygen ventilator
US4037595A (en) * 1974-04-11 1977-07-26 Elam James O Breathing equipment such as resuscitators
FR2384506A1 (en) * 1977-03-25 1978-10-20 Cavitron Corp Intermediate apparatus for administering a aerosol to a patient
US4919132A (en) * 1987-08-21 1990-04-24 Miser Martin G Apparatus for supplying gas to a patient
US5040532A (en) * 1989-03-03 1991-08-20 Alfery David D Continuous positive airway pressure device for thoracic surgery utilizing one-lung anesthesia
US5140982A (en) * 1986-07-07 1992-08-25 Jack Bauman Resuscitator
US5144945A (en) * 1989-04-20 1992-09-08 Nippon Sanso Kabushiki Kaisha Portable oxygen-enriching air inhaler
US5537998A (en) * 1987-01-14 1996-07-23 Bauman; Jack Emergency manual resuscitator with means for detecting air pressure
US5690097A (en) * 1996-05-31 1997-11-25 Board Of Regents, The University Of Texas System Combination anesthetic mask and oxygen transport system
US5944013A (en) * 1998-12-11 1999-08-31 Burch; John M. Resuscitator
US20030079751A1 (en) * 1997-02-10 2003-05-01 Kwok Philip R. Mask and vent assembly therefor
US6581594B1 (en) * 2000-05-15 2003-06-24 Resmed Limited Respiratory mask having gas washout vent and gas washout vent for respiratory mask
US6647983B2 (en) * 2000-03-17 2003-11-18 The Johns Hopkins University Low-pressure valve
US20040050389A1 (en) * 2001-11-06 2004-03-18 Georges Boussignac Respiratory assistance device
US20040255948A1 (en) * 2003-06-18 2004-12-23 Smith Ian Malcolm Vent and/or diverter assembly for use in breathing apparatus
US20070095350A1 (en) * 2003-11-25 2007-05-03 Donald Darkin Vent system for cpap patient interface used in treatment of sleep disordered breathing
WO2007053878A1 (en) * 2005-11-08 2007-05-18 Resmed Ltd Nasal assembly
US20070131229A1 (en) * 2003-07-09 2007-06-14 Map Medizin-Technologie Gmbh Respiratory mask arrangement as well as headband arrangement and respiratory gas evacuation device for a respiratory mask
US20070246043A1 (en) * 2004-04-15 2007-10-25 Resmed Limited Positive-Air-Pressure Machine Conduit
US20100051034A1 (en) * 2006-11-14 2010-03-04 Resmed Limited Frame and vent assembly for mask assembly
US7942150B2 (en) 2004-04-09 2011-05-17 Resmed Limited Nasal assembly
US8122886B2 (en) 1997-02-10 2012-02-28 Resmed Limited Respiratory mask assembly with vent
US8251066B1 (en) * 2004-12-22 2012-08-28 Ric Investments, Llc Exhalation port with built-in entrainment valve
US20120240924A1 (en) * 2011-03-22 2012-09-27 Rustad Andre M Delivering diluted oxygen to a patient
US8297285B2 (en) 2006-07-28 2012-10-30 Resmed Limited Delivery of respiratory therapy
US8590533B2 (en) 2010-10-14 2013-11-26 Casey Danford Adjustable inhalation resistence exercise device
US20140318546A1 (en) * 2011-09-27 2014-10-30 Koninklijke Philips N.V. Respiratory mask with condensed liquid outlet
US9067086B2 (en) 2011-06-07 2015-06-30 Casey J. Danford High performance ventilatory training mask incorporating multiple and adjustable air admittance valves for replicating various encountered altitude resistances
US20150335847A1 (en) * 2014-05-21 2015-11-26 Atom Medical Corporation Gas supply mask apparatus
US20160008639A1 (en) * 2013-03-01 2016-01-14 Draeger Safety Uk Limited Valve assembly
US9320866B2 (en) 2006-07-14 2016-04-26 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US9333315B2 (en) 2004-02-23 2016-05-10 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US20160220778A1 (en) * 2012-01-23 2016-08-04 Aeon Research And Technology, Inc. Gas delivery venturi
USD765237S1 (en) 2015-11-04 2016-08-30 Trainingmask, Llc Resistance breathing device
USD767754S1 (en) 2015-11-02 2016-09-27 Trainingmask, Llc Resistance and filtration breathing device
US9561339B2 (en) 2009-11-18 2017-02-07 Fisher & Paykel Healthcare Limited Nasal interface
US9561338B2 (en) 2010-10-08 2017-02-07 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US9579540B1 (en) 2016-01-06 2017-02-28 Trainingmask, L.L.C. Resistance breathing device
US9643048B1 (en) 2016-09-09 2017-05-09 TrainingMask L.L.C. Resistance breathing device
US9707444B1 (en) 2016-03-22 2017-07-18 Trainingmask Llc Resistance breathing device
US20170326325A1 (en) * 2008-05-12 2017-11-16 Fisher & Paykel Healthcare Limited Patient interface and aspects thereof
US9884160B2 (en) 2004-04-02 2018-02-06 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
USD811581S1 (en) 2016-03-03 2018-02-27 Trainingmask Llc Resistance breathing device
US9901700B2 (en) 2008-10-10 2018-02-27 Fisher & Paykel Healthcare Limited Nasal pillows for a patient interface
USD820974S1 (en) 2016-09-30 2018-06-19 TrainingMask L.L.C. Resistance breathing device
USD823455S1 (en) 2017-02-23 2018-07-17 Fisher & Paykel Healthcare Limited Cushion assembly for breathing mask assembly
USD823454S1 (en) 2017-02-23 2018-07-17 Fisher & Paykel Healthcare Limited Cushion assembly for breathing mask assembly
USD824020S1 (en) 2017-02-23 2018-07-24 Fisher & Paykel Healthcare Limited Cushion assembly for breathing mask assembly
US10080856B2 (en) 2012-08-08 2018-09-25 Fisher & Paykel Healthcare Limited Headgear for patient interface
US10307552B2 (en) 2013-09-06 2019-06-04 Breathe Technologies, Inc. Jet pump adaptor for ventilation system
US10322312B1 (en) 2018-06-01 2019-06-18 TrainingMask L.L.C. Resistance and filtration breathing device
US10328226B2 (en) 2008-05-12 2019-06-25 Fisher & Paykel Healthcare Limited Patient interface and aspects thereof
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Cited By (100)

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Publication number Priority date Publication date Assignee Title
US3995625A (en) * 1973-10-18 1976-12-07 Cyprane Limited Inhalation devices
US4037595A (en) * 1974-04-11 1977-07-26 Elam James O Breathing equipment such as resuscitators
US3977432A (en) * 1975-01-13 1976-08-31 American Hospital Supply Corporation Breathing mask and variable concentration oxygen diluting device therefor
US4022202A (en) * 1975-01-17 1977-05-10 William Edward Price Resuscitator inhalator oxygen ventilator
FR2384506A1 (en) * 1977-03-25 1978-10-20 Cavitron Corp Intermediate apparatus for administering a aerosol to a patient
US4173977A (en) * 1977-03-25 1979-11-13 Cavitron Corporation Aerosol interface
US5140982A (en) * 1986-07-07 1992-08-25 Jack Bauman Resuscitator
US5537998A (en) * 1987-01-14 1996-07-23 Bauman; Jack Emergency manual resuscitator with means for detecting air pressure
US4919132A (en) * 1987-08-21 1990-04-24 Miser Martin G Apparatus for supplying gas to a patient
US5040532A (en) * 1989-03-03 1991-08-20 Alfery David D Continuous positive airway pressure device for thoracic surgery utilizing one-lung anesthesia
US5144945A (en) * 1989-04-20 1992-09-08 Nippon Sanso Kabushiki Kaisha Portable oxygen-enriching air inhaler
WO1992002269A1 (en) * 1990-07-27 1992-02-20 Alfery David D Cpap device for surgery utilizing one-lung anesthesia
US5690097A (en) * 1996-05-31 1997-11-25 Board Of Regents, The University Of Texas System Combination anesthetic mask and oxygen transport system
US8826910B2 (en) 1997-02-10 2014-09-09 Resmed Limited Mask and vent assembly therefor
US20030079751A1 (en) * 1997-02-10 2003-05-01 Kwok Philip R. Mask and vent assembly therefor
US8122886B2 (en) 1997-02-10 2012-02-28 Resmed Limited Respiratory mask assembly with vent
US7845354B2 (en) 1997-02-10 2010-12-07 Resmed Limited Mask and vent assembly therefor
US8833371B2 (en) 1997-02-10 2014-09-16 Resmed Limited Mask and vent assembly therefor
US5944013A (en) * 1998-12-11 1999-08-31 Burch; John M. Resuscitator
US6647983B2 (en) * 2000-03-17 2003-11-18 The Johns Hopkins University Low-pressure valve
US20030164170A1 (en) * 2000-05-15 2003-09-04 Joanne Drew Respiratory mask having gas washout vent and gas washout vent assembly for respiratory mask
US6581594B1 (en) * 2000-05-15 2003-06-24 Resmed Limited Respiratory mask having gas washout vent and gas washout vent for respiratory mask
US20050092326A1 (en) * 2000-05-15 2005-05-05 Resmed Limited Respiratory mask having gas washout vent and gas washout vent assembly for respiratory mask
US7159587B2 (en) 2000-05-15 2007-01-09 Resmed Limited Respiratory mask having gas washout vent and gas washout vent assembly for respiratory mask
US8528558B2 (en) 2000-05-15 2013-09-10 Resmed Limited Respiratory mask having washout vent and gas washout vent assembly for a respiratory mask
US7926487B2 (en) 2000-05-15 2011-04-19 Resmed Limited Respiratory mask having gas washout vent and gas washout vent assembly for a respiratory mask
US6823865B2 (en) 2000-05-15 2004-11-30 Resmed Limited Respiratory mask having gas washout vent and gas washout vent assembly for respiratory mask
US6814075B2 (en) * 2001-11-06 2004-11-09 Georges Boussignac Respiratory assistance device
US20040050389A1 (en) * 2001-11-06 2004-03-18 Georges Boussignac Respiratory assistance device
US8146596B2 (en) 2003-06-18 2012-04-03 Resmed Limited Vent and/or diverter assembly for use in breathing apparatus
US20080156330A1 (en) * 2003-06-18 2008-07-03 Resmed Limited Vent and/or Diverter Assembly for Use in Breathing Apparatus
US9629973B2 (en) 2003-06-18 2017-04-25 Resmed Limited Oxygen diverter valve
US7559326B2 (en) 2003-06-18 2009-07-14 Resmed Limited Vent and/or diverter assembly for use in breathing apparatus
US20040255948A1 (en) * 2003-06-18 2004-12-23 Smith Ian Malcolm Vent and/or diverter assembly for use in breathing apparatus
US8528562B2 (en) 2003-06-18 2013-09-10 Resmed Limited Oxygen diverter valve
US9789274B2 (en) 2003-07-09 2017-10-17 Resmed R&D Germany Gmbh Respiratory mask arrangement as well as headband arrangement and respiratory gas evacuation device for a respiratory mask
US20070131229A1 (en) * 2003-07-09 2007-06-14 Map Medizin-Technologie Gmbh Respiratory mask arrangement as well as headband arrangement and respiratory gas evacuation device for a respiratory mask
US10118009B2 (en) 2003-11-25 2018-11-06 Resmed Limited Vent system for CPAP patient interface used in treatment of sleep disordered breathing
US9844640B2 (en) * 2003-11-25 2017-12-19 Resmed Limited Vent system for CPAP patient interface used in treatment of sleep disordered breathing
US8678003B2 (en) * 2003-11-25 2014-03-25 Resmed Limited Vent system for CPAP patient interface used in treatment of sleep disordered breathing
US20070095350A1 (en) * 2003-11-25 2007-05-03 Donald Darkin Vent system for cpap patient interface used in treatment of sleep disordered breathing
US20140174444A1 (en) * 2003-11-25 2014-06-26 Resmed Limited Vent system for cpap patient interface used in treatment of sleep disordered breathing
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