FR2682042A1 - Device for ventilating the respiratory airways with pulsed and filtered air and its applications - Google Patents
Device for ventilating the respiratory airways with pulsed and filtered air and its applications Download PDFInfo
- Publication number
- FR2682042A1 FR2682042A1 FR9112233A FR9112233A FR2682042A1 FR 2682042 A1 FR2682042 A1 FR 2682042A1 FR 9112233 A FR9112233 A FR 9112233A FR 9112233 A FR9112233 A FR 9112233A FR 2682042 A1 FR2682042 A1 FR 2682042A1
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- flow
- ventilator
- respiratory
- fan
- shutter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/201—Controlled valves
- A61M16/202—Controlled valves electrically actuated
- A61M16/203—Proportional
- A61M16/204—Proportional used for inhalation control
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0057—Pumps therefor
- A61M16/0066—Blowers or centrifugal pumps
- A61M16/0069—Blowers or centrifugal pumps the speed thereof being controlled by respiratory parameters, e.g. by inhalation
-
- 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
- A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
- A61M16/022—Control means therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0057—Pumps therefor
- A61M16/0066—Blowers or centrifugal pumps
-
- 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
- A61M16/105—Filters
- A61M16/106—Filters in a path
- A61M16/107—Filters in a path in the inspiratory path
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
- A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
- A61M2016/0033—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical
- A61M2016/0042—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical in the expiratory circuit
Landscapes
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Pulmonology (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
Description
L'invention concerne un dispositif pour ventiler des voies respiratoires. The invention relates to a device for ventilating the respiratory tract.
Il est connu d'utiliser un ventilateur rotatif équipé d'une prise d'air munie d'un filtre pour fournir un débit d'air respiratoire filtré et des moyens de transmission associés au ventilateur pour transmettre cet air aux voies respiratoires, et dans un dispositif classique ce ventilateur fournit l'air, à débit constant, à un masque muni d'un clapet expiratoire. It is known to use a rotary ventilator equipped with an air intake provided with a filter to provide a flow rate of filtered respiratory air and transmission means associated with the ventilator to transmit this air to the respiratory tract, and in a classic device this ventilator supplies air, at constant flow, to a mask fitted with an exhalation valve.
La respiration d'un sujet étant essentiellement variable en fonction de l'effort qu'il fournit, le débit du ventilateur doit être calibré pour le maximum demandé. Cette règle est impérative si l'on exige que la pression dans le masque reste positive. The breathing of a subject being essentially variable according to the effort which it provides, the flow of the ventilator must be calibrated for the maximum requested. This rule is imperative if it is required that the pressure in the mask remains positive.
Une telle méthode entraîne en situation de repos les inconvénients suivants
- consommation électrique excessive,
- balayage intempestif et inconfortable du masque, et, d'une manière générale, une perte d'énergie puisque, la moitié du temps, le sujet en phase expiratoire, n'a pas besoin d'un apport d'air.Such a method entails the following disadvantages in a situation of rest
- excessive power consumption,
- untimely and uncomfortable scanning of the mask, and, in general, a loss of energy since, half the time, the subject in the expiratory phase, does not need a supply of air.
La présente invention a pour but d'éviter ces inconvénients. The present invention aims to avoid these drawbacks.
On y parvient, selon l'invention, en utilisant comme ventilateur un ventilateur centrifuge et en lui associant des moyens de modulation tels que le débit de l'air fourni par le ventilateur aux voies respiratoires soit modulé par la demande respiratoire entre une valeur minimale et une valeur maximale, sans modification de la rotation du ventilateur. According to the invention, this is achieved by using a centrifugal ventilator as a ventilator and by associating it with modulation means such that the flow of air supplied by the ventilator to the respiratory tract is modulated by the respiratory demand between a minimum value and a maximum value, without changing the fan rotation.
Dans une première réalisation, la modulation est obtenue par un obturateur commandé disposé sur la sortie du ventilateur et dont le degré d'obturation est commandé par un signal provenant d'un capteur de débit des gaz expirés de telle sorte que pour un débit expiratoire nul le degré d'obturation soit minimal et que pour un débit expiratoire donné il soit maximal. In a first embodiment, the modulation is obtained by a controlled shutter disposed on the outlet of the fan and the degree of shutter control of which is controlled by a signal from a flow sensor of the exhaled gases such that for a zero expiratory flow the degree of obturation is minimum and that for a given expiratory flow it is maximum.
Dans une deuxième réalisation, la modulation est obtenue par un choix précis des caractéristiques du ventilateur, lequel est associé à un masque muni d'un clapet expiratoire taré, par exemple à une valeur voisine de + 4 mb, le ventilateur étant choisi pour que sa pression sous débit nul
soit égale ou légèrement supérieure à ladite valeur de tarage et que son débit pour une pression nulle soit égal au débit maximal de pointe respiratoire envisagé (généralement 150 à 200 1/mon). In a second embodiment, the modulation is obtained by a precise choice of the characteristics of the ventilator, which is associated with a mask provided with a calibrated expiratory valve, for example at a value close to + 4 mb, the ventilator being chosen so that its pressure at zero flow
is equal to or slightly greater than said calibration value and that its flow rate for zero pressure is equal to the maximum respiratory peak flow rate envisaged (generally 150 to 200 1 / mon).
On décrira ci-après des exemples de ces deux types de réalisation, en référence aux figures du dessin joint sur lequel
- la figure 1 est un schéma de principe de la première réalisation
- la figure 2 est un schéma de principe de la deuxième réalisation
- la figure 3 est un graphique montrant la relation entre la pression et le débit de l'air fourni par un ventilateur choisi conformément à l'invention, et
- la figure 4 est un graphique montrant l'influence de l'introduction d'un clapet taré dans le circuit respiratoire sur la relation entre la pression et le débit de l'air fourni par le ventilateur.Examples of these two types of embodiment will be described below, with reference to the figures in the attached drawing in which
- Figure 1 is a block diagram of the first embodiment
- Figure 2 is a block diagram of the second embodiment
FIG. 3 is a graph showing the relationship between the pressure and the flow rate of the air supplied by a fan chosen in accordance with the invention, and
- Figure 4 is a graph showing the influence of the introduction of a calibrated valve in the respiratory circuit on the relationship between the pressure and the flow of air supplied by the ventilator.
Le dispositif représenté sur la figure 1 est constitué d'un masque M alimenté en air pulsé et filtré par un ventilateur S muni d'une prise d'air l comportant un filtre et d'une sortie d'air 2 reliée à une entrée 7 du masque par une conduite 3. Sur cette conduite, est interposé un obturateur à volet C dont le fonctionnement est commandé par un signal représentatif du débit d'air expiré et fourni par un capteur de débit D monté dans une conduite de gaz expirés 4 partant du clapet expiratoire 5 du masque M et relié à l'obturateur par une liaison de commande 6. The device shown in FIG. 1 consists of a mask M supplied with pulsed air and filtered by a fan S provided with an air intake l comprising a filter and an air outlet 2 connected to an inlet 7 mask through a pipe 3. On this pipe, a shutter C is interposed, the operation of which is controlled by a signal representative of the expired air flow rate and supplied by a flow sensor D mounted in an exhaled gas pipe 4 leaving of the expiratory valve 5 of the mask M and connected to the obturator by a control link 6.
Le ventilateur S est un ventilateur centrifuge actionné par un moteur et le rectangle S sur la figure l représente schématiquement l'ensemble constitué par le ventilateur et le moteur. The fan S is a centrifugal fan actuated by a motor and the rectangle S in FIG. 1 schematically represents the assembly constituted by the fan and the motor.
Fonctionnement.
Le ventilateur S fournit de l'air filtré sous un débit maximal Vm au masque M via l'obturateur à volet normalement ouvert.Operation.
The fan S supplies filtered air at a maximum flow rate Vm to the mask M via the shutter with a normally open shutter.
L'air qui sort du masque M par le clapet expiratoire traverse le capteur de débit D dont le signal pilote l'obturateur, de telle sorte qu'un faible débit expiratoire entraîne la fermeture de l'obturateur ou la quasi-fermeture de l'obturateur (pour laisser- subsister une petite ventilation de confort). The air which leaves the mask M through the expiration valve passes through the flow sensor D, the signal of which controls the shutter, so that a low expiratory flow causes the shutter to close or the quasi-closing of the shutter (to leave a small comfort ventilation).
Si G est le gain du système, le débit V qui s'échappe en D est tel que
t = Vm
G
Ainsi pour tm = 200 1/mon et G = 10, un sujet en situation d'apnée a son masque soumis à un balayage V de 20 1/mon. If G is the gain of the system, the flow V which escapes at D is such that
t = Vm
G
Thus for tm = 200 1 / mon and G = 10, a subject in situation of apnea has his mask subjected to a scan V of 20 1 / mon.
Si ce sujet inspire, sa demande d'air entraîne une diminution du débit en D, ce qui augmente l'ouverture de O qui fournit alors le débit demandé. If this subject inspires, his air demand causes a decrease in the flow rate in D, which increases the opening of O which then supplies the requested flow rate.
Durant l'expiration qui suit, le débit t provenant de O s'annule tant que le débit expiratoire excède 20 I/mn. During the following expiration, the flow t coming from O is canceled as long as the expiratory flow exceeds 20 l / min.
Durant ces modulations du débit V, le ventilateur se comporte comme un système qui accumule l'énergie durant les phases de faible débit. During these modulations of the flow rate V, the fan behaves like a system which accumulates energy during the phases of low flow rate.
pour la restituer durant celles de fort débit.to restore it during those of high flow.
En effet, un ventilateur centrifuge dont on a obturé la sortie augmente de vitesse et abaisse la puissance électrique demandée pour la réduire aux frottements du vortex quril maintient en circuit fermé. Cette survitesse est une accumulation d'énergie cinétique libérable dès l'ouverture de la sortie. Indeed, a centrifugal fan whose outlet has been closed increases speed and lowers the electrical power required to reduce it to the friction of the vortex which is maintained in a closed circuit. This overspeed is an accumulation of kinetic energy releasable when the outlet is opened.
La respiration étant un phénomène cyclique, un tel dispositif s'adapte parfaitement à cette situation en offrant les avantages suivants
- balayage réduit dans le masque durant les périodes de repos,
- pression positive permanente dans le masque,
- consommation électrique réduite,
- capacité accrue à répondre à de courts débits de pointe,
- usure des filtres moindre puisque traversés par des débits proportionnés à l'effort fourni.Breathing being a cyclical phenomenon, such a device adapts perfectly to this situation by offering the following advantages
- reduced scanning in the mask during rest periods,
- permanent positive pressure in the mask,
- reduced power consumption,
- increased capacity to respond to short peak flows,
- less wear on the filters since they are flowed through in proportion to the effort provided.
Il est possible de simplifier ce montage conformément à une deuxième réalisation où le ventilateur est choisi avec des caractéristiques adaptées précisément au circuit respiratoire. It is possible to simplify this assembly in accordance with a second embodiment where the ventilator is chosen with characteristics precisely adapted to the respiratory circuit.
La figure 2 est un schéma de principe de cette deuxième réalisation. Figure 2 is a block diagram of this second embodiment.
Dans cette deuxième réalisation, l'obturateur commandé à volet C est remplacé par un simple clapet antiretour C' et le capteur de débit D est supprimé et remplacé par un clapet expiratoire taré 5. In this second embodiment, the shutter controlled shutter C is replaced by a simple non-return valve C 'and the flow sensor D is removed and replaced by a calibrated exhalation valve 5.
Le circuit respiratoire doit répondre idéalement aux conditions suivantes
- surpression constante entre + 3 et + 4 mb
pour des débits inspiratoires évoluant
entre 0 et 150 I/mn (t = 50 I/mn)
L'apport d'air dans le masque dû au ventilateur doit vaincre une perte en charge provenant de
a) filtres d'entrée (2 éléments en parallèle)
b) conduits et raccords
c) clapets du 1/2 masque et déflecteurs a, b et c sont directement proportionnels au débit.The respiratory circuit should ideally meet the following conditions
- constant overpressure between + 3 and + 4 mb
for evolving inspiratory flow rates
between 0 and 150 I / min (t = 50 I / min)
The air supply in the mask due to the ventilator must overcome a pressure drop from
a) input filters (2 elements in parallel)
b) conduits and fittings
c) 1/2 mask valves and deflectors a, b and c are directly proportional to the flow.
L'ensemble présente une résistance de la forme = = KD (1)
K étant un coefficient caractéristique de la géométrie des éléments a, b et c, P étant la pression de l'air fourni par le ventilateur et
D étant le débit instantané fourni par le ventilateur.The set has a resistance of the form = = KD (1)
K being a coefficient characteristic of the geometry of the elements a, b and c, P being the pressure of the air supplied by the fan and
D being the instantaneous flow supplied by the fan.
La relation entre la pression et le débit de l'air fourni par un ventilateur centrifuge dépend notamment de l'inclinaison des pales et, compte tenu des pertes en charge, on donne la préférence à un ventilateur dont les pales sont inclinées dans le sens de la rotation, ce ventilateur fournissant un débit d'air D dont la relation avec la pression d'air P est du type représenté par la courbe (A) sur la figure 3. Sur cette figure, la courbe (B) représente la variation due aux pertes en charge et la courbe (C) est la courbe résultante des courbes (A) et (B). The relationship between the pressure and the flow rate of the air supplied by a centrifugal fan depends in particular on the inclination of the blades and, taking into account the pressure losses, preference is given to a fan whose blades are inclined in the direction of rotation, this fan supplying an air flow D whose relationship with the air pressure P is of the type represented by the curve (A) in FIG. 3. In this figure, the curve (B) represents the variation due at pressure losses and curve (C) is the resulting curve of curves (A) and (B).
On calcule le ventilateur pour obtenir une caractéristique finale telle que
Po = 5 mb
DM = 150 I/mn
En disposant alors à l'expiration un clapet taré de valeur T légèrement inférieure à Po (par exemple T = 4 mb (courbe E)), on obtient une courbe telle que représentée en (D) sur la figure 4.We calculate the fan to obtain a final characteristic such as
Po = 5 mb
DM = 150 I / min
By then disposing at the expiration a calibrated valve of value T slightly less than Po (for example T = 4 mb (curve E)), a curve is obtained as shown in (D) in FIG. 4.
On voit sur la figure 4 que
- à l'apnée, le masque est balayé par le débit DA qui est un débit minimal assurant une petite ventilation continue,
- à l'inspiration, la pression reste positive jusqu'à concurrence d'une demande de 150 1/mon
- à l'expiration, la pression dépasse 4 mb et tend à annuler le débit du ventilateur.We see in Figure 4 that
- in apnea, the mask is swept by the DA flow which is a minimum flow ensuring a small continuous ventilation,
- on inspiration, the pressure remains positive up to a demand of 150 1 / month
- on expiration, the pressure exceeds 4 mb and tends to cancel the fan flow.
L'invention n'est pas limitée aux deux réalisations qui ont été décrites. The invention is not limited to the two embodiments which have been described.
L'invention s'applique notamment à la ventilation d'un sujet susceptible d'être exposé à des gaz nocifs et le dispositif est destiné en particulier à un pilote d'hélicoptère mais il est entendu que ces applications ne limitent pas la portée de l'invention. The invention applies in particular to the ventilation of a subject liable to be exposed to harmful gases and the device is intended in particular for a helicopter pilot but it is understood that these applications do not limit the scope of the 'invention.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9112233A FR2682042B1 (en) | 1991-10-04 | 1991-10-04 | DEVICE FOR VENTILATION OF THE RESPIRATORY TRACKS IN PULSED AIR AND FILTER AND ITS APPLICATIONS. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9112233A FR2682042B1 (en) | 1991-10-04 | 1991-10-04 | DEVICE FOR VENTILATION OF THE RESPIRATORY TRACKS IN PULSED AIR AND FILTER AND ITS APPLICATIONS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2682042A1 true FR2682042A1 (en) | 1993-04-09 |
| FR2682042B1 FR2682042B1 (en) | 1998-04-30 |
Family
ID=9417597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9112233A Expired - Lifetime FR2682042B1 (en) | 1991-10-04 | 1991-10-04 | DEVICE FOR VENTILATION OF THE RESPIRATORY TRACKS IN PULSED AIR AND FILTER AND ITS APPLICATIONS. |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2682042B1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994006499A1 (en) * | 1992-09-18 | 1994-03-31 | Pierre Medical S.A. | Breathing aid device |
| FR2714837A1 (en) * | 1994-01-12 | 1995-07-13 | Saime | Device for assisting the ventilation of a patient, comprising in particular a volumetric inspiratory assistance mode. |
| EP0667169A1 (en) * | 1994-01-12 | 1995-08-16 | Société d'Applications Industrielles Medicales et Electroniques ( SAIME) | Device for respiratory assistance with limited pressure mode of treating support |
| WO1997006843A1 (en) * | 1995-08-16 | 1997-02-27 | David Weintraub | A computer controlled portable ventilator |
| WO1997010868A1 (en) * | 1995-09-18 | 1997-03-27 | Resmed Limited | Pressure control in cpap treatment or assisted respiration |
| FR2760196A1 (en) * | 1997-03-03 | 1998-09-04 | Saime Sarl | RESPIRATORY ASSISTANCE APPARATUS PROVIDED WITH A DEVICE FOR CREATING A DEPRESSION IN THE EXPIRATORY CIRCUIT |
| US6237593B1 (en) | 1993-12-03 | 2001-05-29 | Resmed Limited | Estimation of flow and detection of breathing CPAP treatment |
| US6776155B2 (en) | 1997-05-16 | 2004-08-17 | Resmed Limited | Nasal ventilation as a treatment for stroke |
| US6810876B2 (en) | 1996-09-23 | 2004-11-02 | Resmed Ltd. | Assisted ventilation to match patient respiratory need |
| US7931023B2 (en) | 1991-12-20 | 2011-04-26 | Resmed Limited | Patient interface assembly for CPAP respiratory apparatus |
| US8752547B2 (en) | 1993-11-05 | 2014-06-17 | Resmed Limited | Distinguishing between closed and open airway apneas and treating patients accordingly |
| US8997739B2 (en) | 1996-10-16 | 2015-04-07 | Resmed Limited | Vent valve apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPN236595A0 (en) | 1995-04-11 | 1995-05-11 | Rescare Limited | Monitoring of apneic arousals |
| AUPO742297A0 (en) | 1997-06-18 | 1997-07-10 | Resmed Limited | An apparatus for supplying breathable gas |
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| GB2118625A (en) * | 1982-04-06 | 1983-11-02 | Hgd Enterprises Ltd | Portable breathing aids |
| FR2644254A1 (en) * | 1987-10-05 | 1990-09-14 | Kemira Oy | Method of regulating the quantity of air delivered to a gas mask and gas mask implementing this method |
| EP0402951A2 (en) * | 1989-06-16 | 1990-12-19 | Manabu Akashi | Mechanical ventilator for patient |
-
1991
- 1991-10-04 FR FR9112233A patent/FR2682042B1/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2118625A (en) * | 1982-04-06 | 1983-11-02 | Hgd Enterprises Ltd | Portable breathing aids |
| FR2644254A1 (en) * | 1987-10-05 | 1990-09-14 | Kemira Oy | Method of regulating the quantity of air delivered to a gas mask and gas mask implementing this method |
| EP0402951A2 (en) * | 1989-06-16 | 1990-12-19 | Manabu Akashi | Mechanical ventilator for patient |
Non-Patent Citations (1)
| Title |
|---|
| GB-A-9771;A.D.1915 (W.HARDING) * |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7931023B2 (en) | 1991-12-20 | 2011-04-26 | Resmed Limited | Patient interface assembly for CPAP respiratory apparatus |
| WO1994006499A1 (en) * | 1992-09-18 | 1994-03-31 | Pierre Medical S.A. | Breathing aid device |
| US8752547B2 (en) | 1993-11-05 | 2014-06-17 | Resmed Limited | Distinguishing between closed and open airway apneas and treating patients accordingly |
| US6237593B1 (en) | 1993-12-03 | 2001-05-29 | Resmed Limited | Estimation of flow and detection of breathing CPAP treatment |
| FR2714837A1 (en) * | 1994-01-12 | 1995-07-13 | Saime | Device for assisting the ventilation of a patient, comprising in particular a volumetric inspiratory assistance mode. |
| EP0667169A1 (en) * | 1994-01-12 | 1995-08-16 | Société d'Applications Industrielles Medicales et Electroniques ( SAIME) | Device for respiratory assistance with limited pressure mode of treating support |
| US5542416A (en) * | 1994-01-12 | 1996-08-06 | Societe D'applications Industrielles Medicales Et Electroniques (Saime) | Apparatus for assisting ventilation including reduced exhalation pressure mode |
| WO1997006843A1 (en) * | 1995-08-16 | 1997-02-27 | David Weintraub | A computer controlled portable ventilator |
| GB2319967A (en) * | 1995-08-16 | 1998-06-10 | David Weintraub | A computer controlled porrtable ventilator |
| GB2319967B (en) * | 1995-08-16 | 2000-02-16 | David Weintraub | A computer controlled portable ventilator |
| WO1997010868A1 (en) * | 1995-09-18 | 1997-03-27 | Resmed Limited | Pressure control in cpap treatment or assisted respiration |
| US6810876B2 (en) | 1996-09-23 | 2004-11-02 | Resmed Ltd. | Assisted ventilation to match patient respiratory need |
| US7644713B2 (en) | 1996-09-23 | 2010-01-12 | Resmed Limited | Method and apparatus for determining instantaneous leak during ventilatory assistance |
| US8051853B2 (en) | 1996-09-23 | 2011-11-08 | Resmed Limited | Method and apparatus for providing ventilatory assistance |
| US8733351B2 (en) | 1996-09-23 | 2014-05-27 | Resmed Limited | Method and apparatus for providing ventilatory assistance |
| US9974911B2 (en) | 1996-09-23 | 2018-05-22 | Resmed Limited | Method and apparatus for providing ventilatory assistance |
| US8997739B2 (en) | 1996-10-16 | 2015-04-07 | Resmed Limited | Vent valve apparatus |
| US9770571B2 (en) | 1996-10-16 | 2017-09-26 | Resmed Limited | Vent valve assembly |
| EP0862922A1 (en) * | 1997-03-03 | 1998-09-09 | Société d'Applications Industrielles Medicales et Electroniques ( SAIME) | Respiratory assistance device with device for creating an negative pressure in the exhalation circuit |
| FR2760196A1 (en) * | 1997-03-03 | 1998-09-04 | Saime Sarl | RESPIRATORY ASSISTANCE APPARATUS PROVIDED WITH A DEVICE FOR CREATING A DEPRESSION IN THE EXPIRATORY CIRCUIT |
| US6776155B2 (en) | 1997-05-16 | 2004-08-17 | Resmed Limited | Nasal ventilation as a treatment for stroke |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2682042B1 (en) | 1998-04-30 |
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