WO1991005579A1 - Amenagement pour la protection des voies respiratoires de laryngectomises - Google Patents

Amenagement pour la protection des voies respiratoires de laryngectomises Download PDF

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Publication number
WO1991005579A1
WO1991005579A1 PCT/SE1990/000670 SE9000670W WO9105579A1 WO 1991005579 A1 WO1991005579 A1 WO 1991005579A1 SE 9000670 W SE9000670 W SE 9000670W WO 9105579 A1 WO9105579 A1 WO 9105579A1
Authority
WO
WIPO (PCT)
Prior art keywords
holder
arrangement
stoma
filter means
mounting element
Prior art date
Application number
PCT/SE1990/000670
Other languages
English (en)
Inventor
Curt Danielsson
Original Assignee
Pharma Systems Ps Ab
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 Pharma Systems Ps Ab filed Critical Pharma Systems Ps Ab
Publication of WO1991005579A1 publication Critical patent/WO1991005579A1/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
    • A61M16/04—Tracheal tubes
    • A61M16/0465—Tracheostomy tubes; Devices for performing a tracheostomy; Accessories therefor, e.g. masks, filters
    • A61M16/047—Masks, filters, surgical pads, devices for absorbing secretions, specially adapted 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. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1045—Devices for humidifying or heating the inspired gas by using recovered moisture or heat from the expired gas

Definitions

  • the present invention relates to an arrangement for protecting the breathing passages of laryngectomees, i.e. people with a throat stoma for the passage of inhaled and exhaled air, said arrangement comprising a flexible, aper- tured mounting element adapted to be sealingly applied to the throat of the laryngectomee in such manner that the aperture is positioned over the stoma, and connected to a projecting socket-shaped holder accommodating an exchange ⁇ able filter means through which the air passes during inhalation and exhalation through the stoma.
  • the trachea is made to communicate with an open hole on the outside of the throat, a so-called stoma.
  • sur- gery of this type entails considerable inconveniences for the patient.
  • the inhaled air will often be too dry or cold, or contain too many particles, because the temperature-regulating and filtering effect of the oral and nasal cavities no longer exists. This involves health hazards to the laryngectomees whose bronchi often become infected.
  • the dress ⁇ ing mainly consists of a mounting element, preferably a tape or an adhesive plastic film, a filter being arranged over a hole in the centre of the mounting element.
  • the intention is that the mounting element should be arranged over the stoma in such manner that the filter is centered over it.
  • the filter should, at least partly, take over the function of the oral and nasal cavities by retaining some of the heat and moisture of the exhaled air to facilitate inhalation.
  • the filter pre- vents the ingress of particles to the respiratory pas ⁇ sages.
  • One object of the present invention is to obviate the above inconveniences by providing an arrangement in which the filter means is reliably kept in place and can be expediently exchanged.
  • Another ob ect of the invention is to provide an arrangement which is easy to handle, does not take up much space, and has an aesthetic appear- ance.
  • US 4,325,366 discloses a device for protecting the breathing passages of so-called tracheostomees.
  • This device comprises a valve insert which is introduced into a smooth, cylindrical holder. It would seem obvious that also laryngectomees should be able to use a device of the type carried by tracheostomees. It is, however, out of the question that the device in US 4,325,366 could be successfully used by a laryngectomee, because the natural respiratory passages of a tracheostomee are still open, and all the inhaled air therefore need not pass through the stoma.
  • a laryngectomee has had his larynx removed, and it would consequently be fatal to let the trachea open in the pharynx, considering that food and liquid may enter the lungs when there is no closing larynx. For this reason, the natural respiratory passages through the pharynx are completely closed, and all the inhaled air must compulsorily pass through the stoma. This entails that, e.g. in a fit of coughing, a large amount of air will pass through the stoma in a short time, resulting in that devices which, like the arrangement of the present invention, are applied in front the stoma, are subjected to high air pressures.
  • FIG. 1 is a perspective view illustrating how an inventive arrangement, with various acces ⁇ sories, is to be applied to the throat of a laryngectomee,
  • FIG. 2 is an exploded perspective view of a carrier and a breathing filter
  • FIGS 3 and 4 are perspective views of alternative embodi ⁇ ments of the carrier as seen from behind.
  • FIG. 1 illustrates how the inventive arrangement is to be fixed to the throat of a laryngectomee, and how various accessories may be connected to the holder of the arrangement.
  • a mounting element or carrier 1 consists of a self-adhesive, flexible tape which is to be sealingly attached to the throat around the stoma 2 of the laryn- gectomee.
  • the tape also carries a holder 3 projecting from the tape and having a wall 3' which defines a space 26. This holder is adapted to accommodate a releasable accessory member.
  • Fig. 1 illustrates preferred embodi ⁇ ments of such accessories, the function and construction of which will be described in more detail below.
  • Fig. 2 shows a first embodiment of the carrier with the holder and an accessory member in the form of a fil ⁇ ter.
  • the carrier consists of a double-adhe ⁇ sive piece of tape 8, i.e. a tape with adhesive on both sides.
  • the centre of the tape there is an aperture over which the holder 3 is centered and fixed in such manner that a rear flange 9 of the holder is attached to the front of the tape.
  • the front is the side which is to be placed so as to face away from the throat of the laryngectomee
  • the back is the side which is to face the throat.
  • a flexible fibre cloth or fabric 10 is applied to the front of the carrier.
  • This cloth or fabric is formed with an aperture 11 through which the projecting part of the holder extends.
  • the latter has a circumferential bead 12, the edge of the cloth being positioned in a groove between the bead and the flange.
  • the cloth is of non- woven type.
  • the back of the carrier is covered by a release paper 14 to protect the tape before this is attached to the skin.
  • the cylindrical holder 3 is preferably made of an at least to some extent resilient material, such as silicone rubber and silicone plastic.
  • the material is in the form of a grid 15 for preventing various objects from being sucked into the respiratory passages.
  • the front of the holder has an inwardly bent or inwardly projecting annular edge portion 16 ensuring that the accessories introduced into the holder are held in place.
  • One aim of the present invention is that the carrier with the holder should be allowed to remain on the throat of the laryngectomee for up to a week before it is necessary to replace it. Thus, the skin around the stoma is not exposed to unnecessary strain, as is the case when the tape has to be removed frequently.
  • a filter which, for reasons of hygiene, might be necessary once or twice every day, the filter is in the form of an exchangeable accessory member 5 forming part of a complete set of accessories suited for different purposes.
  • This set may further include a high-efficiency breathing filter 4 having an extra thick layer of filter medium 17, which gives it a high capacity for storing moisture and heat, and, optionally, a layer filtering off bacteria.
  • a breathing filter of this type is used e.g. when the laryngectomee is risking an infection in the respiratory passages, or in polluted surroundings. Since the filter layer is thick, the breathing resistance will be comparatively high. To compensate for this, the flow area of the filter has been enlarged by providing the filter medium in a part which in its entirety is to be located outside the holder and which is much larger than the part of an insert introduced into the holder 3.
  • a breathing filter 5 which is much smaller than the one described above, is perfectly adequate.
  • the details of such a filter are apparent from Fig. 2.
  • the entire filter is to be contained in the holder 3, so that the arrangement in its entirety will take up a minimum of space and not be too conspicuous.
  • the filter is made up of an outer sleeve 18 which encloses the filter medium 17 and in the circumferential surface of which are formed a number of slots 19. Every other slot ends at a given, short distance 20 from the rear end of the sleeve, while the other slots end at a corresponding distance from the front end of the sleeve.
  • the filter member is given a radial deformability which facilitates introduction into the holder.
  • the front end of the member is formed with an inwardly bent edge portion or groove 21 which the corresponding inwardly bent edge portion 16 of the front portion of the holder is intended to engage.
  • the front portion of the filter member is provided with a cross-shaped stop 22 preventing the filter medium from being pressed out.
  • the filter member is equipped with a pulling band 23 to facilitate exchange thereof.
  • the accessory set may further comprise an extension piece 6 comprising an angular tube 6' and a flexible tube 6".
  • This extension piece is especially suited for use in cold weather, when the inlet opening thereof is kept under a coat lapel or the like to preheat the inhalation air.
  • An angular tube 7 is made up of a member 7' which can be inserted in the holder 3, and a member 7" extend- ing perpendicularly from the member 7' .
  • This tube is especially adapted for use when taking a shower, and pre ⁇ vents water from entering the lungs through the stoma when the member 7" is directed downwards.
  • Figs. 3 and 4 are rear views of alternative embodi- ments of the carrier.
  • the embodiment in Fig. 3 is for people who are especially sensitive in the area imme ⁇ diately around the stoma.
  • the flange 9 of the holder is located at the back of the tape, so that an area immediately adjacent to the aperture is free from adhesive agents, which makes it extra kind to the skin.
  • the embodiment in Fig. 4 is provided with a liquid-absorbing ring 24 which may consist of foam plastic or a felt material. This ring serves to absorb liquid or phlegm from the respiratory passages of people for whom this is a problem.
  • Fig. 3 illustrates a detail intended to facilitate removal of the carrier from the skin.
  • the inventive arrange ⁇ ment may be modified in many ways within the scope of the appended claims.
  • many other types of accessories may form part of the accessory set
  • the shape of the car ⁇ rier may of course be varied, and the holder need not be cylindrical, although this is preferred in actual prac ⁇ tice.
  • the means for holding the filter hol ⁇ der in place may be otherwise designed, e.g. the inwardly protecting portion of the holder may be in the form of a bead and need not necessarily engage a corresponding, inwardly projecting portion or groove on the filter accessory member, but may also grip about the outer end edges thereof.
  • the inwardly projecting portions of both the socket-shaped holder and the accessory member need not extend around their entire peripheries, but may consist of a number of spaced-apart portions. Neither need the inwardly projecting portions be located at the outer end portion of the holder.
  • the holder and the mounting ele ⁇ ment are to remain on the throat of the laryngectomee for up to a week.
  • One reason for this is that, owing to the strong adhesion necessary to ensure that the mounting element remains in place despite the high air pressure that may arise, the mounting element cannot be torn off too often since this may irritate or hurt the skin around the stoma.
  • the inventive holder is made of a soft and yielding material enabling other types of acces- sory members, not adapted to be contained in their entirety in the holder, to be introduced and held in place therein.
  • Such alternative accessories include the short bent tube 7 used when taking showers, the long flexible tube 6 used in cold weather to preheat the inhalation air, or the large filter 4 suited for use in highly polluted air. All these accessories are to be used for specific occasions only, and need not therefore be held in place as securely as the small filter 5 which is the one normally used, in the daytime as well as at night.
  • the breathing resistance of these acces ⁇ sories is not as high as that of the small filter 5, the air pressure on the accessories will be lower in a fit of coughing.
  • the holder being made of a soft flexible mate ⁇ rial, it is possible to insert such accessories with sub- stantially smooth cylindrical tube connections, despite the presence of the inwardly projecting annular portion. Furthermore, the latter will increase the force with which the accessories are maintained in place, owing to it being compressed about the tube connections.
  • the holder is in the form of a tight-fitting collar preventing the breathing air from bypassing any of the filters or the other accessories.
  • the small filter 5 is contained in its entirety in the space defined by the holder wall, it is, of course, perfectly conceivable that the front end of the filter projects somewhat beyond the boundary wall of the holder. However, the projecting portion of the filter should not have a length exceeding about 1/4 of the length of the filter, as measured from its front to its rear end.

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  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Emergency Medicine (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)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

Un aménagement pour la protection des passages respiratoires de laryngectomisés comprend un élément de montage souple à ouverture (1) que l'on peut appliquer, de façon hermétique, à la gorge du laryngectomisé. Ledit élément est relié à un élément de serrage saillant en forme de douille (3) dans lequel on loge un moyen de filtrage échangeable (5). Lors de l'inhalation et de l'exhalation, de l'air passe, au moyen d'un stomate de gorge (2), à travers ledit moyen de filtrage. L'élément de serrage est conçu de manière à contenir le moyen de filtrage sensiblement dans un espace défini par la paroi dudit élément. Ledit élément comprend également des moyens pour assurer le maintien sur place du moyen de filtrage et pour empêcher que ledit moyen soit éjecté de l'élément de serrage.
PCT/SE1990/000670 1989-10-20 1990-10-18 Amenagement pour la protection des voies respiratoires de laryngectomises WO1991005579A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8903479-7 1989-10-20
SE8903479A SE466990B (sv) 1989-10-20 1989-10-20 Anordning foer att skydda andningsvaegarna hos laryngektomerade personer

Publications (1)

Publication Number Publication Date
WO1991005579A1 true WO1991005579A1 (fr) 1991-05-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000670 WO1991005579A1 (fr) 1989-10-20 1990-10-18 Amenagement pour la protection des voies respiratoires de laryngectomises

Country Status (3)

Country Link
AU (1) AU6618890A (fr)
SE (1) SE466990B (fr)
WO (1) WO1991005579A1 (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201309A (en) * 1990-11-22 1993-04-13 Gillis Andersson Breathing aid for laryngotomy tracheostomy patients
FR2683150A1 (fr) * 1991-10-30 1993-05-07 Robert Bezicot Nez artificiel pour sujet tracheotomise, avec un orifice chirurgical abouchant la trachee a la peau.
WO1994001199A2 (fr) * 1992-07-10 1994-01-20 Emmark Technology Dispositif de filtre pour tracheotomie
DE29816303U1 (de) 1998-09-11 1998-12-10 Hölscher, Andreas, Dr., 50933 Köln Tracheostoma-Vorrichtung
US5848590A (en) * 1995-07-25 1998-12-15 Kapitex Healthcare Limited Tracheostoma filter with HME properties
WO2000016840A1 (fr) * 1998-09-23 2000-03-30 ADEVA Medical Gesellschaft für Entwicklung und Vertrieb von Medizinischen Implantat-Artikeln mbH Valve de tracheotomie
WO2003105938A1 (fr) * 2002-02-27 2003-12-24 Medical Products Octagon Ab Procede permettant l'echange de chaleur et d'humidite entre des courants d'air d'inhalation et d'exhalation
US6668831B1 (en) * 2001-02-20 2003-12-30 Michael E. Hegwood Appliance for a stoma
WO2004004816A1 (fr) * 2002-07-06 2004-01-15 Kapitex Healthcare Limited Support pour canule de tracheostome
US6772758B2 (en) * 1999-09-30 2004-08-10 Atos Medical Breathing protector
WO2008132222A2 (fr) * 2007-04-30 2008-11-06 Atos Medical Ab Protecteur respiratoire
EP2133112A1 (fr) * 2008-06-10 2009-12-16 Covidien AG Filtre et/ou dispositif HME pour circuits respiratoires comprenant un piège froid
WO2012048682A1 (fr) * 2010-10-14 2012-04-19 Primed Halberstadt Medizintechnik Gmbh Dispositif respiratoire comportant un support pour des membranes vocales et/ou des échangeurs de chaleur et d'humidité sans fixation de canule
WO2012055389A1 (fr) * 2010-10-29 2012-05-03 Primed Halberstadt Medizintechnik Gmbh Pansement pour le cou destiné à des canules trachéales ou des nez artificiels comportant une membrane vocale
KR20190051369A (ko) * 2017-11-06 2019-05-15 정화숙 후두 전적출 환자용 기능성 인공 코 대체기구
US10682481B2 (en) 2016-11-29 2020-06-16 Claudine Gammon Attachment for a tracheal device
KR20210072411A (ko) * 2019-12-09 2021-06-17 인제대학교 산학협력단 기관 절개 환자용 산소 마스크
WO2021177881A1 (fr) * 2020-03-02 2021-09-10 Fogless International Ab Coiffe d'humidification de l'air entrant dans une valve de trachéotomie
EP3919106A1 (fr) * 2020-06-03 2021-12-08 Andreas Fahl Medizintechnik-Vertrieb GmbH Trachéostomie-épithèse et procédé de fabrication d'une trachéostomie-épithèse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE511530C2 (sv) * 1993-12-23 1999-10-11 Atos Medical Ab Anordning vid ett i halsen upptaget stoma
SE513668C2 (sv) * 1997-01-30 2000-10-16 Atos Medical Ab Andningsskydd för en laryngektomerad eller trakeostomerad person

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924636A (en) * 1974-07-05 1975-12-09 Benjamin Alfred Addison Endotracheal tube holder
US4009720A (en) * 1975-08-14 1977-03-01 Shiley Laboratories, Inc. Wedge seal for a tracheotomy tube
US4325366A (en) * 1980-07-07 1982-04-20 Tabor Carl J Valve and method for use with a tracheotomy tube
US4759356A (en) * 1985-03-08 1988-07-26 David Muir Tracheostomy device and related methods

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924636A (en) * 1974-07-05 1975-12-09 Benjamin Alfred Addison Endotracheal tube holder
US4009720A (en) * 1975-08-14 1977-03-01 Shiley Laboratories, Inc. Wedge seal for a tracheotomy tube
US4325366A (en) * 1980-07-07 1982-04-20 Tabor Carl J Valve and method for use with a tracheotomy tube
US4759356A (en) * 1985-03-08 1988-07-26 David Muir Tracheostomy device and related methods

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201309A (en) * 1990-11-22 1993-04-13 Gillis Andersson Breathing aid for laryngotomy tracheostomy patients
FR2683150A1 (fr) * 1991-10-30 1993-05-07 Robert Bezicot Nez artificiel pour sujet tracheotomise, avec un orifice chirurgical abouchant la trachee a la peau.
WO1993008860A1 (fr) * 1991-10-30 1993-05-13 Robert Bezicot Nez artificiel pour sujet tracheotomise
AU663900B2 (en) * 1991-10-30 1995-10-26 Robert Bezicot Artificial nose for a tracheotomy patient
WO1994001199A2 (fr) * 1992-07-10 1994-01-20 Emmark Technology Dispositif de filtre pour tracheotomie
WO1994001199A3 (fr) * 1992-07-10 1994-03-17 Emmark Technology Dispositif de filtre pour tracheotomie
US5666950A (en) * 1992-07-10 1997-09-16 Kapitex Healthcare Ltd. Filter device for a tracheostoma
US5848590A (en) * 1995-07-25 1998-12-15 Kapitex Healthcare Limited Tracheostoma filter with HME properties
DE29816303U1 (de) 1998-09-11 1998-12-10 Hölscher, Andreas, Dr., 50933 Köln Tracheostoma-Vorrichtung
WO2000016840A1 (fr) * 1998-09-23 2000-03-30 ADEVA Medical Gesellschaft für Entwicklung und Vertrieb von Medizinischen Implantat-Artikeln mbH Valve de tracheotomie
US6772758B2 (en) * 1999-09-30 2004-08-10 Atos Medical Breathing protector
US6668831B1 (en) * 2001-02-20 2003-12-30 Michael E. Hegwood Appliance for a stoma
WO2003105938A1 (fr) * 2002-02-27 2003-12-24 Medical Products Octagon Ab Procede permettant l'echange de chaleur et d'humidite entre des courants d'air d'inhalation et d'exhalation
WO2004004816A1 (fr) * 2002-07-06 2004-01-15 Kapitex Healthcare Limited Support pour canule de tracheostome
GB2405348A (en) * 2002-07-06 2005-03-02 Kapitex Healthcare Ltd Tracheostoma cannula mounting
GB2405348B (en) * 2002-07-06 2005-11-16 Kapitex Healthcare Ltd Tracheostoma cannula mounting
WO2008132222A2 (fr) * 2007-04-30 2008-11-06 Atos Medical Ab Protecteur respiratoire
EP3701990A1 (fr) * 2007-04-30 2020-09-02 Atos Medical AB Protecteur de respiration
WO2008132222A3 (fr) * 2007-04-30 2009-01-22 Atos Medical Ab Protecteur respiratoire
US8505537B2 (en) 2007-04-30 2013-08-13 Atos Medical Ab Breathing protector
EP2133112A1 (fr) * 2008-06-10 2009-12-16 Covidien AG Filtre et/ou dispositif HME pour circuits respiratoires comprenant un piège froid
JP2009297513A (ja) * 2008-06-10 2009-12-24 Covidien Ag 凝縮トラップを備える呼吸回路のためのフィルタおよび／またはｈｍｅ装置
US8176916B2 (en) 2008-06-10 2012-05-15 Covidien Ag Filter and/or HME device for respiratory circuits comprising a condensation trap
WO2012048682A1 (fr) * 2010-10-14 2012-04-19 Primed Halberstadt Medizintechnik Gmbh Dispositif respiratoire comportant un support pour des membranes vocales et/ou des échangeurs de chaleur et d'humidité sans fixation de canule
US9168345B2 (en) 2010-10-14 2015-10-27 Primed Halberstadt Medizintechnik Gmbh Breathing device comprising a support for speech valves and/or heat and moisture exchange devices without fixing to the cannula
WO2012055389A1 (fr) * 2010-10-29 2012-05-03 Primed Halberstadt Medizintechnik Gmbh Pansement pour le cou destiné à des canules trachéales ou des nez artificiels comportant une membrane vocale
US9901694B2 (en) 2010-10-29 2018-02-27 Primed Halberstadt Medizintechnik Gmbh Neck patch for tracheal cannulas or artificial noses having a speaking valve
US10682481B2 (en) 2016-11-29 2020-06-16 Claudine Gammon Attachment for a tracheal device
KR20190051369A (ko) * 2017-11-06 2019-05-15 정화숙 후두 전적출 환자용 기능성 인공 코 대체기구
KR102012029B1 (ko) 2017-11-06 2019-08-19 정화숙 후두 전적출 환자용 기능성 인공 코 대체기구
KR20210072411A (ko) * 2019-12-09 2021-06-17 인제대학교 산학협력단 기관 절개 환자용 산소 마스크
KR102347792B1 (ko) * 2019-12-09 2022-01-07 인제대학교 산학협력단 기관 절개 환자용 산소 마스크
WO2021177881A1 (fr) * 2020-03-02 2021-09-10 Fogless International Ab Coiffe d'humidification de l'air entrant dans une valve de trachéotomie
EP3919106A1 (fr) * 2020-06-03 2021-12-08 Andreas Fahl Medizintechnik-Vertrieb GmbH Trachéostomie-épithèse et procédé de fabrication d'une trachéostomie-épithèse

Also Published As

Publication number Publication date
SE8903479D0 (sv) 1989-10-20
SE466990B (sv) 1992-05-11
AU6618890A (en) 1991-05-16
SE8903479L (sv) 1991-04-21

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