US3745991A - Environmental contamination control device - Google Patents

Environmental contamination control device Download PDF

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Publication number
US3745991A
US3745991A US00117391A US3745991DA US3745991A US 3745991 A US3745991 A US 3745991A US 00117391 A US00117391 A US 00117391A US 3745991D A US3745991D A US 3745991DA US 3745991 A US3745991 A US 3745991A
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United States
Prior art keywords
air
aerosol
housing
filter
cowl
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Expired - Lifetime
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US00117391A
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English (en)
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W Gauthier
J Ridley
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.)
PFAUDEVIL HOLDINGS Co
DeVilbiss Healthcare LLC
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Champion Spark Plug Co
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Publication of US3745991A publication Critical patent/US3745991A/en
Assigned to CONTINENTAL ILLINOIS NATIONAL BANK AND TRUST COMPANY OF CHICAGO, 231 SOUTH LASALLE STREET, CHICAGO, ILLINOIS 60697 reassignment CONTINENTAL ILLINOIS NATIONAL BANK AND TRUST COMPANY OF CHICAGO, 231 SOUTH LASALLE STREET, CHICAGO, ILLINOIS 60697 SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DEVILBISS HEALTH CARE, INC.
Assigned to DEVILBISS HEALTH CARE, INC. reassignment DEVILBISS HEALTH CARE, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHAMPION SPARK PLUG COMPANY
Assigned to PFAUDEVIL HOLDINGS CO. reassignment PFAUDEVIL HOLDINGS CO. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DEVILBISS HEALTH CARE, INC.
Anticipated expiration legal-status Critical
Assigned to DEVILBISS HEALTH CARE, INC. reassignment DEVILBISS HEALTH CARE, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CONTINENTAL BANK N.A.
Assigned to DEVILBISS HEALTH CARE, INC. reassignment DEVILBISS HEALTH CARE, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: PFAUDEVIL HOLDINGS CO.
Expired - Lifetime legal-status Critical Current

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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
    • A61M15/00—Inhalators
    • A61M15/0086—Inhalation chambers
    • 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
    • A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
    • A61M16/009—Removing used or expired gases or anaesthetic vapours
    • 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
    • A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
    • A61M16/009—Removing used or expired gases or anaesthetic vapours
    • A61M16/0093—Removing used or expired gases or anaesthetic vapours by adsorption, absorption or filtration

Definitions

  • ABSTRACT An improved device for a medical treatment station which may include inducing and collecting sputum without contaminating the environment.
  • a patient is positioned to inhale an aerosol from a discharge hose connected to a nebulizer.
  • Sputum, excess aerosol and room air are drawn through an ultra-high-efficiency filter system to remove preferably at least 99.97 percent of 0.3 micron and larger particles from the air.
  • the purified air is returned to the room, except for a controlled portion which is diverted to the nebulizer for delivering a controlled density aerosol.
  • the filter system preferably includes a gross particle filter and a prefilter in addition to the ultra-high-efficiency filter.
  • the aerosol discharge hose is positioned! in a cowl which directs room air, exhaled air, sputum and excess aerosol to the filter.
  • the highly contaminated aerosol discharge hose, cowl, gross particle filter and pre-filter, and in severe contamination cases the housing and the ultrahigh-efficiency filter, are all disposable.
  • This invention relates to a device for use in medical diagnosis and treatment and, more particularly, to an improved device for administering medical aerosols to a patient without contaminating the environment.
  • a physician it is sometimes desirable for a physician to cause a patient to expectorate sputum.
  • precautions must be taken not to contaminate the environment, since the patient may have a communicable disease.
  • a sample of the sputum must be collected. Sputum samples may, for example, be required for bacteriologic, cytologic and mycologic diagnosis. Sputum induction may also follow treatment progress in tuber culosis and other infectious pulmonary diseases.
  • aerosols may be used, for example, for tracheo bronchial particle deposition and cleansing or for administering anesthesia.
  • an improved device for administering therapeutic or cough inducing aerosols and for collecting sputum samples without contaminating the environment with excess aerosol medicament or expectorated sputum.
  • sputum is intended to include not only expectorated matter, mucus, or the like, but exhaled contaminated aerosols and particulate matter.
  • the device generally comprises an enclosed housing having an air inlet and an air outlet.
  • An ultra-high-efficiency filter capable of removing 99.95 percent of 1 micron and larger particles from air and preferably capable of removing at least 99.97 percent of 0.3 micron and larger particles from air is placed between the air inlet and the air outlet in the housing.
  • a blower is mounted between the tilter and the air outlet to cause air to flow through the air inlet, the filter and the air outlet.
  • a cow] is releasably attached to the housing to direct air, sputum and aerosol particles to the air inlet.
  • the filter comprises a disposable gross particle filter, a disposable pre-filter and a disposable ultra-high-efficiency filter. Contaminated air is sequentially filtered by the gross particle filter, the pre-filter and theuItra high-efficiency filter.
  • the gross particle filter is designed for replacement after each use of the environmental contamination control device, while the pre-filter is replaced periodically at relatively short intervals, e.g., every 30 days, and the ultra-highefficiency filter is replaced periodically at longer intervals, e.g., every year. When required, sputum samples are expectorated into a disposable container positioned adjacent the filter inlet.
  • Another object of the invention is to provide an improved device for inducing sputum and reducing environmental contamination from the induced sputum.
  • Another object of the invention is to provide an improved device for reducing environmental contamination during inhalation therapy in which all contaminated parts of the device are disposable.
  • Still another object of the invention is to provide an improved air filtering device for reducing environmental contamination while applying an aerosol to a patient and in which filtered exhaust air from the device is used in delivering the aerosol.
  • FIG. 1 is a view in perspective of an improved device according to the present invention for delivering an aerosol to a patient and for preventing environmental contamination from sputum, exhaled air and excess aerosol;
  • FIG. 2 is a side elevational view in section of an improved environmental contamination control device according to the present invention.
  • FIG. 3 is a front end elevational view of an improved environmental contamination control device according to the present invention.
  • FIG. 4 is a rear end elevational view of an improved environmental contamination control device according to the present invention.
  • FIG. 5 is a fragmentary cross-sectional view of a control valve for diverting a portion of the filtered exhaust air to a nebulizer.
  • the device 10 generally comprises a filter and blower housing 12, a cowl 13 and a nebulizer 14 mounted on a carriage 15.
  • the nebulizer l4 delivers an aerosol through a supply hose 17 and a discharge hose 18 to within the confines of the cow] 13.
  • the patient 11 is positioned with his face adjacent a flared or enlarged opening 19 defined by the cowl 13.
  • the patient 11 inhales a concentrated aerosol discharged from the hose 18, which may induce a coughing spasm.
  • a concentrated aerosol discharged from the hose 18, which may induce a coughing spasm When the patient 11 is induced to cough, he exhales violently and may discharge sputum into the cowl 13.
  • Room air, exhaled air, sputum and excess aerosol are drawn into the housing 12 wherein the air is highly filtered and cleaned.
  • the filtered air is discharged at a rear end 20 of the housing 12, with a portion of the air being diverted into the hose 16.
  • the carriage includes a base 23 which is mounted on wheels 24 for mobility.
  • a pair of parallel, vertical support members 25 are attached to the base 23.
  • the housing 12 is positioned between and adjustably attached to the support members 25 by means of trunnions 26.
  • the trunnions 26 permit a vertical and an angular adjustment of the position of the housing 12 to facilitate using the device 10 with patients in various positions, for example, lying or sitting on a bed or sitting on a chair.
  • the nebulizer 14 is also attached to one of the support members 25.
  • the nebulizer 14 may be any suitable commercially available unit.
  • One type of nebulizer found to be particularly suitable is that shown in US Pat. No. 3,387,607 entitled Apparatus for Inhalation Therapy.
  • the nebulizer 14 may be omitted.
  • the housing 12 generally comprises a box constructed from a relatively inexpensive disposable material, such as plywood.
  • An air inlet 27 is formed in one end of the housing 12 while a rigid plate 28 closes the other end of the housing 12.
  • An opening 29 in the plate 28 defines an air outlet.
  • a conventional blower 30, such as a squirrel cage blower, is mounted on the plate 28 to draw air through the cowl l3 and the housing 12 and exhaust such air through the outlet 29.
  • a switch 31 is mounted on the plate 28 for controlling the blower 30.
  • a bracket 32 is also mounted on the back plate 28 for storing a power cord 33 for the device 10 when it is not in use.
  • the back plate 28 is removably attached to the housing 12 by means of screws 34 such that the back plate 28 and the blower 30 may be removed as a unit for maintenance, gas sterilization or attachment to a new housing 12. All permanent parts of the device 10 are mounted either on the carriage 15 or on the back plate 28.
  • a wire cowl frame 37 is provided with an end 38 which snaps or tightly fits into the air inlet 27 of the housing 12.
  • the cowl 13 preferably comprises a thin sheet of a transparent synthetic resinous material.
  • the cowl 13 is attached to the housing 12 by folding over the end 38 of the frame 37 and inserting the end 38 into the air inlet 27, where it is held in place by friction and compression.
  • An extended end 39 of the cow] 13 is folded over an enlarged wire loop 40 which forms a projecting end of the frame 37 and defines the opening 19.
  • the frame 37 is preferably constructed from rigid wire and is coated with a synthetlc resin which prevents corrosion and is easily cleaned and disinfected.
  • the aerosol discharge hose 18 is releasably held in place by a connector 41 which is attached to the housing 12 and the hose 17.
  • the hose 18 extends through a sized opening 42 in the cowl 13.
  • the aerosol discharge hose 18 is also constructed from an inexpensive disposable material, such as a synthetic resin, formed into a desired shape to direct the discharged aerosol.
  • a disposable clip may also be used to give the hose 18 a desired shape and to retain it in position.
  • the hose 18 is removable from the connector 41 and disposable with the cowl 13 after each use of the device 10.
  • a filter system 43 is positioned within the housing 12 to remove particles from air flowing through the housing 12.
  • the heart of the filter system 43 is an ultra-highefficiency filter element 44 which removes substantially all particles from air passing through the housing 12.
  • the filter element 44 removes at least 99.95 percent of 1 micron and larger particles from air, while in its most preferred form, the filter element 44 will remove at least 99.97 percent of 0.3 micron and larger particles.
  • Filters of this type are commercially available and are typically constructed from cellulose-asbestos-fiber paper, glass and glass-asbestos fiber papers, ceramic fiber paper, compressed glass fibers, or composite beds of glass wool pads.
  • ultra-high-efficiency filters of this type have a higher resistance to air flow than less efficient filters, the filter is usually pleated to provide an increased filter surface area in a small frontal area.
  • the ultra-high-efficiency filter 44 is disposable and must be replaced when it becomes loaded with particles from the air.
  • a gross particle filter 45 and a pre-filter 46 are placed upstream of the ultra-highefficiency filter 44.
  • the gross particle filter 45 may, for example, comprise a relatively thin mat of rayon fiber, while the pre-filter 46 may comprise a thicker glass fiber screen.
  • the gross particle filter 45 is designed for replacement after each use of the device 10, while the pre-filter 46 is only periodically replaced, for example, every 30 days.
  • a control valve 47 is shown for diverting a selected or controllable portion of the clean air exhausted from the blower 30 to the air hose 16 which connects to the nebulizer 14.
  • the control valve 47 includes an inlet member 48 which is positioned to open into the airstream from the blower 30. Air passes through the inlet 48 and through the valve 47 directly into the hose 16.
  • the valve 47 also includes a closure member 49 which is rotated by means of a knob 50.
  • the closure member 49 rotates between an open position shown in solid in FIG. 5 and a closed position shown in dashed lines in FIG. 5.
  • the closure member 49 may be positioned with the knob 50 to give a controlled air flow in the hose 16 to deliver a predetermined aerosol concentration to the cowl 13. When the aerosol is not required and the nebulizer 14 is omitted, the valve 47 may of course be omitted.
  • An improved device for reducing environmental contamination during medical treatment or diagnosis of a problem of a patient comprising, in combination, an enclosed housing having an air inlet and an air outlet, a cowl constructed from a thin film such that it is disposable after a single use of said device, wire-like frame means releasably attaching said cow] to said housing, means releasably mounting said wire-like frame means on said housing adjacent said air inlet, said cowl being positioned on said frame means to extend completely around said air inlet to direct an aerosol and sputum from the patient to said air inlet, filter means positioned in said housing between said air inlet and said air outlet, said filter means removing substantially all particles larger than one micron from air passed through said housing, blower means positioned in said housing between said filter means and said air outlet for causing air to flow sequentially through said cowl, said air inlet, said filter means and said air outlet, and means on said device for supplying an aerosol to within the confines of said cow] to be breathed by the patient.
  • said means for supplying an aerosol includes an aerosol supply hose located exterior to said cowl, an aerosol hose section disposable after a single use having an outlet positioned within the confines of said cowl and an inlet exterior to said cowl, and coupler means releasably connecting said disposable aerosol hose section inlet to said aerosol supply hose.
  • An improved device for reducing environmental contamination as defined in claim 2, and including means for adjusting said disposable aerosol hose to direct the aerosol in a predetermined direction within the confines of said cowl.
  • An improved device for reducing environmental contamination during an induced sputum as defined in claim 4, wherein said filter means further includes a gross particle filter disposable after a single use, and means removably mounting said gross particle filter between said air inlet and said ultra-high-efficiency filter, whereby said gross particle filter reduces loading of said ultra-high-efficiency filter.
  • An improved device for reducing environmental contamination during an induced sputum as defined in claim 1, wherein said means for supplying an aerosol includes an ultrasonic nebulizer, and means for supplying a controlled flow of air to said ultrasonic nebulizer.
  • said means for supplying a controlled flow of air to said ultrasonic nebulizer includes an adjustable valve, an air hose connecting said valve to said nebulizer, and means mounting said adjustable valve to divert a controlled portion of the filtered air leaving said blower means into said hose.
  • said means for supplying an aerosol further includes an aerosol supply hose positioned exterior to said cowl, means connecting said supply hose to said nebulizer, an aerosol hose section disposable after a single use having an outlet positioned within the confines of said cowl and an inlet exterior to said cow], and coupler means releasably connecting said disposable hose section inlet to said aerosol supply hose.
  • An improved device for reducing environmental contamination as defined in claim 1, and further including a mobile carriage, means attaching said housing to said carriage, and means for adjusting the position of said housing on said carriage to direct said cowl to receive sputum from a patient.
  • An improved device for reducing environmental contamination as defined in claim 1, wherein said disposable cowl comprises a thin film of synthetic resinous material.
  • An improved device for reducing environmental contamination during medical treatment or diagnosis of a problem of a patient comprising, in combination, an enclosed housing having an air inlet and an air outlet, filter means positioned in said housing between said air inlet and said air outlet for removing at least 99.97 percent of 0.3 micron and larger particles from air passed through said housing, blower means positioned in said housing between said filter means and said air outlet for causing air to flow through said air inlet, said filter means and said air outlet, aerosol generating means, means mounting said aerosol generating means on said device for supplying an aerosol to adjacent said air inlet, cowl means attached to said housing for directing air, sputum from the patient and the aerosol to said air inlet, and means for supplying a flow of filtered air from said air outlet to said aerosol generating means, said air supplying means including an adjustable valve, an air hose connecting said valve to said aerosol generating means, and means connecting said adjustable valve to said housing to divert a controlled portion of the filtered air from said blower means to said hose
  • An improved device for reducing environmental contamination as defined in claim 12, wherein said aerosol generating means includes an ultrasonic nebulizer.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Hematology (AREA)
  • Pulmonology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Emergency Medicine (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • External Artificial Organs (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
US00117391A 1971-02-22 1971-02-22 Environmental contamination control device Expired - Lifetime US3745991A (en)

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US11739171A 1971-02-22 1971-02-22

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US (1) US3745991A (de)
JP (1) JPS5029597B1 (de)
CA (1) CA979768A (de)
CH (1) CH547641A (de)
DE (1) DE2204443A1 (de)
FR (1) FR2126241A1 (de)
GB (1) GB1333896A (de)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116387A (en) * 1976-05-11 1978-09-26 Eastfield Corporation Mist generator
US4505190A (en) * 1982-04-19 1985-03-19 Nuclear & Environmental Protection, Inc. Portable maintenance exhaust hood
WO1992016250A1 (en) * 1991-03-25 1992-10-01 Choate Thomas V Respiratory filter apparatus and method
US5233975A (en) * 1989-12-01 1993-08-10 Choate Thomas V Respiratory filter apparatus with patient enclosure and method
US5253641A (en) * 1989-12-01 1993-10-19 Choate Thomas V Respiratory filter apparatus and method
USD344586S (en) 1991-04-03 1994-02-22 Choate Thomas V Respiratory filter machine to reduce airborne disease transmission of a patient
US5299566A (en) * 1991-09-19 1994-04-05 Burroughs Wellcome Co. Method of administering phospholipid dispersions
US5372126A (en) * 1992-09-14 1994-12-13 Blau; Anthony D. Pulmonary sampling chamber
WO1995020413A1 (en) * 1994-01-31 1995-08-03 Blau Anthony D Pulmonary sampling chamber and method
WO1995020412A1 (en) * 1994-01-31 1995-08-03 Blau Anthony D Pulmonary sampling chamber
US5533305A (en) * 1994-08-30 1996-07-09 Mark Solutions, Inc. Treatment booth for infectious patients
US5594972A (en) * 1995-08-15 1997-01-21 Iversen; Edward P. Dust collector
US5823180A (en) * 1995-04-03 1998-10-20 The General Hospital Corporation Methods for treating pulmonary vasoconstriction and asthma
US5873359A (en) * 1990-12-05 1999-02-23 The General Hospital Corporation Methods and devices for treating pulmonary vasoconstriction and asthma
US5941766A (en) * 1997-11-24 1999-08-24 Iversen; Edward P. Dust collector
US6176235B1 (en) * 1995-05-12 2001-01-23 Jacques Benarrouch Oscillatory pressure device for removing the mucus
US6655376B2 (en) * 1998-04-21 2003-12-02 Pneumoflex Systems L.L.C. Aspiration screening process for assessing post surgery patient's risk for pneumonia
US6679249B2 (en) * 1998-04-21 2004-01-20 Pneumoflex Systems, L.L.C. Apparatus for treatment of chronic obstructive pulmonary disease and associated method
US20100242633A1 (en) * 2009-03-23 2010-09-30 The President And Fellows Of Harvard University Biological Particle Collector, and Methods of Use Thereof
US9283333B2 (en) * 2010-07-16 2016-03-15 Boehringer Ingelheim International Gmbh Filter system for use in medical devices
CN108603673A (zh) * 2016-07-15 2018-09-28 皇家飞利浦有限公司 定向清洁空气输送
WO2020020853A1 (de) * 2018-07-25 2020-01-30 Robert Bosch Gmbh Verfahren zur gewinnung einer atemprobe eines probanden und vorrichtung
CN110934749A (zh) * 2019-12-28 2020-03-31 张建元 一种儿科有呕吐物快接器
WO2021262941A1 (en) * 2020-06-25 2021-12-30 LevMarc LLC Negative pressure protective equipment
US11278700B2 (en) 2015-06-24 2022-03-22 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US20220331618A1 (en) * 2021-04-19 2022-10-20 André V. Asselin Avaaka: anti-contaminant venting apparatus and angelic kanga apparel
US20230211038A1 (en) * 2021-12-30 2023-07-06 Koninklijke Philips N.V. Portable sanitizer for airborn pathogens and method of operation thereof

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Publication number Priority date Publication date Assignee Title
US4121916A (en) * 1976-10-26 1978-10-24 Fricke Roy A Portable air purge
US4236902A (en) * 1978-11-15 1980-12-02 Fricke Roy A Modular air purifying device
US5129928A (en) * 1991-06-26 1992-07-14 Air Innovative Systems, Inc. Environment treatment
CN111419720A (zh) * 2019-01-09 2020-07-17 济宁医学院 一种结核病人痰标本保存盒及其中的保存液

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US3511162A (en) * 1969-02-20 1970-05-12 Johnson & Johnson Apparatus and method for isolating a patient zone
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Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116387A (en) * 1976-05-11 1978-09-26 Eastfield Corporation Mist generator
US4505190A (en) * 1982-04-19 1985-03-19 Nuclear & Environmental Protection, Inc. Portable maintenance exhaust hood
US5233975A (en) * 1989-12-01 1993-08-10 Choate Thomas V Respiratory filter apparatus with patient enclosure and method
US5253641A (en) * 1989-12-01 1993-10-19 Choate Thomas V Respiratory filter apparatus and method
US5873359A (en) * 1990-12-05 1999-02-23 The General Hospital Corporation Methods and devices for treating pulmonary vasoconstriction and asthma
WO1992016250A1 (en) * 1991-03-25 1992-10-01 Choate Thomas V Respiratory filter apparatus and method
USD344586S (en) 1991-04-03 1994-02-22 Choate Thomas V Respiratory filter machine to reduce airborne disease transmission of a patient
US5299566A (en) * 1991-09-19 1994-04-05 Burroughs Wellcome Co. Method of administering phospholipid dispersions
US5372126A (en) * 1992-09-14 1994-12-13 Blau; Anthony D. Pulmonary sampling chamber
WO1995020413A1 (en) * 1994-01-31 1995-08-03 Blau Anthony D Pulmonary sampling chamber and method
WO1995020412A1 (en) * 1994-01-31 1995-08-03 Blau Anthony D Pulmonary sampling chamber
US5533305A (en) * 1994-08-30 1996-07-09 Mark Solutions, Inc. Treatment booth for infectious patients
US5823180A (en) * 1995-04-03 1998-10-20 The General Hospital Corporation Methods for treating pulmonary vasoconstriction and asthma
US6176235B1 (en) * 1995-05-12 2001-01-23 Jacques Benarrouch Oscillatory pressure device for removing the mucus
US5594972A (en) * 1995-08-15 1997-01-21 Iversen; Edward P. Dust collector
US5941766A (en) * 1997-11-24 1999-08-24 Iversen; Edward P. Dust collector
US6679249B2 (en) * 1998-04-21 2004-01-20 Pneumoflex Systems, L.L.C. Apparatus for treatment of chronic obstructive pulmonary disease and associated method
US6655376B2 (en) * 1998-04-21 2003-12-02 Pneumoflex Systems L.L.C. Aspiration screening process for assessing post surgery patient's risk for pneumonia
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Also Published As

Publication number Publication date
FR2126241A1 (de) 1972-10-06
CH547641A (de) 1974-04-11
JPS5029597B1 (de) 1975-09-25
GB1333896A (en) 1973-10-17
DE2204443A1 (de) 1972-09-07
CA979768A (en) 1975-12-16

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