NZ725037A - Ventilation mask - Google Patents
Ventilation maskInfo
- Publication number
- NZ725037A NZ725037A NZ725037A NZ72503715A NZ725037A NZ 725037 A NZ725037 A NZ 725037A NZ 725037 A NZ725037 A NZ 725037A NZ 72503715 A NZ72503715 A NZ 72503715A NZ 725037 A NZ725037 A NZ 725037A
- Authority
- NZ
- New Zealand
- Prior art keywords
- mask
- user
- chamber
- sealing recess
- outlet
- Prior art date
Links
- 238000009423 ventilation Methods 0.000 title description 7
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 210000001331 Nose Anatomy 0.000 claims description 7
- 230000000717 retained Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 25
- 210000004072 Lung Anatomy 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 210000003128 Head Anatomy 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 229940075473 Medical gases Drugs 0.000 description 4
- 230000001058 adult Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 210000003437 Trachea Anatomy 0.000 description 3
- 230000003434 inspiratory Effects 0.000 description 3
- 210000002345 respiratory system Anatomy 0.000 description 3
- 210000003491 Skin Anatomy 0.000 description 2
- 230000003444 anaesthetic Effects 0.000 description 2
- 210000003484 anatomy Anatomy 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000000241 respiratory Effects 0.000 description 2
- 238000003339 Best practice Methods 0.000 description 1
- 210000004369 Blood Anatomy 0.000 description 1
- 210000003685 Cricoid Cartilage Anatomy 0.000 description 1
- 210000002409 Epiglottis Anatomy 0.000 description 1
- 241000282816 Giraffa camelopardalis Species 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 210000000867 Larynx Anatomy 0.000 description 1
- 210000003019 Respiratory Muscles Anatomy 0.000 description 1
- 210000000614 Ribs Anatomy 0.000 description 1
- 206010040984 Sleep disease Diseases 0.000 description 1
- 210000000779 Thoracic Wall Anatomy 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- -1 anaesthetics Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 230000001419 dependent Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002169 extracardiac Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 230000032646 lung growth Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920002529 medical grade silicone Polymers 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000000414 obstructive Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000002685 pulmonary Effects 0.000 description 1
- 230000003014 reinforcing Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000036387 respiratory rate Effects 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 230000000576 supplementary Effects 0.000 description 1
- 230000001256 tonic Effects 0.000 description 1
Abstract
mask for the delivery of a medical gas under positive pressure, the mask including a single shell forming a chamber having an outlet, a first passage connecting the chamber to the exterior of the mask, a sealing recess isolated from the chamber and open to allow engagement with the face of a user, and extending around the periphery of the outlet, and a second passage connecting the sealing recess to the exterior of the mask, the arrangement being such that operatively the mask may be placed on a user so as to cover the airway, suction may be connected to the second passage so that the sealing recess seals the mask against the face of the user, and a medical gas may be supplied to the first passage for delivery through the outlet to the airway of the user. and extending around the periphery of the outlet, and a second passage connecting the sealing recess to the exterior of the mask, the arrangement being such that operatively the mask may be placed on a user so as to cover the airway, suction may be connected to the second passage so that the sealing recess seals the mask against the face of the user, and a medical gas may be supplied to the first passage for delivery through the outlet to the airway of the user.
Description
VENTILATION MASK
Technical Field
The present invention relates to masks for delivering air or other gases to
patients, particularly but not exclusively neonates.
Background of the Invention
Masks are used in various clinical settings, such as hospitals, to deliver air,
oxygen or other medical gases to patients. In some instances, they are a relatively loose
fit and are not required to maintain a seal against the face.
However, in many instances it is desirable that a relatively tight fit is maintained.
This is particularly the case where a gas is supplied under pressure to the patients, for
example in a resuscitation situation.
For example, neonatal resuscitation typically takes place using a relatively
sophisticated, controlled source of pressurised air and/or oxygen. This may include
positive end expiratory pressure and Peak Inspiratory Pressure (PEEP and PIP) to assist
in correct lung inflation and improve blood oxygenation. It is understood in the art that it
is critical to deliver air at the correct pressure, volume, gas mix and breathing rate, so that
the neonate’s lungs are not damaged, whilst an effective air flow to assist resuscitation is
provided.
However, in order to achieve the desired outcome for the neonate, it is necessary
that this air is effectively delivered through the mask in the desired way. If the mask is not
relatively well sealed to the infant’s mouth and nose, much of the air will leak out, and the
desired delivery of air will not occur. This is a common situation in conventional practice.
The best practice for infant resuscitation is to hold the mask in the correct position
on the face, whilst also supporting the neonate’s head, and placing the neonate in the
correct posture. This is a rather difficult task in practice, even with two practitioners
assisting. It will be appreciated that the special needs and delicacy of a neonate
necessitate the utmost care be taken in this procedure.
In other contexts, for example delivery of medical gases to adults, it is usual to
provide straps or similar arrangements to hold the mask in place. In some cases the mask
may be over the mouth alone, or both the mouth and nose. However, these provide only
a general retention force, and so do not assist the seal directly. Also, some users find
the straps restrictive and even claustrophobic.
GB patent application No 2336547 by Gee discloses a mask with a double walled
structure, in which the space between the walls surrounding the central chamber is
evacuated to provide a suction seal around the periphery of the mask. It is an object of
the present invention to an improved mask for delivering medical gases to patients.
Summary of the Invention
In a first broad form, the present invention provides a mask which is adapted to
be connected to a source of suction, so as to provide a lowered pressure area to retain
the mask on the face of the patient. In this way, the mask can be held in place while a
medical gas is delivered through the mask.
According to one aspect, the present invention provides a mask for the delivery
of a medical gas under positive pressure, the mask including a single shell forming a
chamber having an outlet, a first passage connecting the chamber to the exterior of the
mask, a sealing recess isolated from the chamber and open to allow engagement with
the face of a user, and extending around the periphery of the outlet, and a second
passage connecting the sealing recess to the exterior of the mask, the arrangement
being such that operatively the mask may be placed on a user so as to cover the
airway, suction may be connected to the second passage so that the sealing recess
seals the mask against the face of the user, and a medical gas may be supplied to the
first passage for delivery through the outlet to the airway of the user.
According to another aspect, the present invention provides a mask for the
delivery of a medical gas including a single shell forming a chamber having an outlet, a
first passage connecting the chamber to the exterior of the mask, a sealing recess
isolated from the chamber and open to allow engagement with the face of a user, and a
second passage connecting the sealing recess to the exterior of the mask, the
arrangement being such that operatively the mask may be placed on the user so as to
cover the airway, suction may be connected to the second passage so that the sealing
recess seals the mask against the face of the user, and a medical gas may be supplied
to the first passage for delivery through the outlet to the airway of user.
According to another aspect, the present invention provides method for retaining
a mask against n the face of a user, so that a medical gas may be delivered under positive
pressure, including:
(a) providing a mask including a chamber with an outlet, a sealing recess isolated from
the chamber, open to the interior of the mask, and extending around the periphery
of the outlet;
(b) connecting the chamber to a source of medical gas and the sealing recess to a
suction system,
(c) placing the mask over an airway of a user;
(d) operating the suction system so that the mask is retained against the face, so that
the medical gas may be delivered.
Thus, implementations of the present invention allow for a mask to be retained
on the face of a user, without requiring any additional devices to be attached around the
head of the user. In many applications, it able to provide a simpler and effective
attachment to the user. Moreover, as in many medical settings a suction facility is
provided, there is no additional cost or inconvenience to the practitioner or hospital to
utilise a device according to an implementation of the present invention.
Brief Description of the Drawings
An illustrative implementation of the present invention will now be described with
reference to the accompanying figures in which: Figure 1 shows an isometric view of one
implementation of the present invention;
Figure 2 shows a bottom view of the implementation of figure 1;
Figure 3 is a cross sectional view of the implementation of figure 1; and
Figure 4 is an illustration of a notional operational device on an infant.
Detailed Description of the invention
The present invention will be described with reference to specific examples,
which are to be understood as illustrative of the scope of the present invention and not
limitative of the scope thereof. It will be appreciated that there are many different
alternative implementations possible using the underlying concepts of the present
invention.
For the purpose of the specification and claims, the term medical gas is intended
to be interpreted broadly. It encompasses air, oxygen, or a mixture thereof, either for
resuscitation, CPAP, PEEP, PIP or any other purpose. It also encompasses other gases,
for example for the delivery of different gas mixtures, therapeutic agents, anaesthetics,
pharmaceuticals, or other agents, either alone or mixed with air. The gases may be either
at ambient or another temperature. The gases may be delivered at a relatively low
pressure, for example as supplementary oxygen, or at a higher pressure, for example for
resuscitation. The gas may have particles or droplet entrained or mixed therein. The
present invention is not limited in scope to any particular gas or treatment.
The main implementation to be described relates to a neonatal resuscitation
system. However, the present invention may be applied to any situation where a medical
gas is required to be delivered, and the mask is required to be correctly placed on the
airways of a user. This includes, for example, resuscitation and ventilation systems,
delivery of anaesthetics, delivery of gas carried treatments (for example for respiratory
conditions), treatments for sleep disorders such as CPAP (continuous positive airway
pressure) devices, and any other application where correct attachment of the mask
around the airways may be useful.
The transition from foetal to extrauterine life is characterised by a series of unique
physiological events. Among these, the lungs change from fluid-filled to air-filled,
pulmonary blood flow increases dramatically, and intracardiac and extracardiac shunts
initially reverse direction and subsequently close. Normal term newborns exert negative
pressures as high as about -8.0 kPa when starting to expand their lungs.
For the first few breaths, these pressures are greater than those needed for
subsequent breaths. Likewise, in those newborns that need assistance to initiate lung
expansion, the fluid-filled alveoli may require higher peak inspiratory and end expiratory
pressures than those commonly used in subsequent ventilation, or in resuscitation later
in infancy.
There are significant differences in the respiratory systems of neonates, children
and adults. Neonates are not small children and children are not small adults. The
anatomy of an infant, head large, neck short, tongue large, narrow nasal passages which
obstruct easily, larynx more cephalad (C4) and anterior, cricoid cartilage narrowest part
of airway, epiglottis long and stiff, trachea short (~5cm in newborns). The small radius of
the trachea causes an increase in resistance to flow in the trachea; further, inflammation
or secretions in the airway cause an exaggerated degree of obstruction in infants, and
this is commonly found with neonates requiring resuscitation.
At birth the alveoli are thick walled and only number 10% of the adult total. Lung
growth occurs by alveolar multiplication until 6 - 8 years. The airways remain relatively
narrow until then. Ventilation is almost entirely diaphragmatic. Infant lungs have poor
elastic properties. It takes some 2 years of life until the geometry of the rib cage changes,
with the gradual development of the "bucket handle" configuration seen in the adult. Ribs
tend to be more horizontal in infants and this limits the potential for thoracic expansion.
(http://www.aic.cuhk.edu.hk/web8/Paediatric%20anatomy%20&%20physiology.htm)
Further, in terms of the biomechanics of ventilation, the chest wall compliance of
infant is very high, and drops as they grow. In contrast, lung compliance is very low at
birth and steadily increases through puberty. FRC of newborns are maintained through
high respiratory rate, controlled expiration (laryngeal braking), and the tonic activity of
ventilatory muscles.
The physiological dead space is approx. 30% of the tidal volume, as in adults,
but the absolute volume is small, so that any increase caused by apparatus (mask or
equipment) deadspace has a proportionally greater effect on infants. The problem is
further exacerbated with premature neonates with their lungs (with significantly more
problems) and body size being even smaller than full term newborns.
The newborn requiring resuscitation is very dependent on accurate delivery of air
pressure and flow with almost no tolerance for variability of these factors. (adult
tolerances are significantly higher and they can survive with much higher variability). In
other words the requirements for accuracy of ventilation are significantly more demanding
for neonates than adults.
There have been very large increases in efficiency and effectiveness in neonatal
resuscitation in recent years, with sophisticated resuscitation equipment producing very
accurate delivery flows and pressures to the neonate. Resuscitation machines are used
in labour and delivery wards, and neonatal Intensive care units (NICU) worldwide. Current
neonatal resuscitation guidelines recommend the use of a T-piece device (part of the
equipment delivery systems) with the potential of achieving controlled targeted Peak
Inspiratory pressures (PIP) and delivering consistent Positive End Expiratory Pressure
(PEEP) to help Functional Residual Capacity (FRC) and improve lung volume in the
neonate. Target PEEP pressure are generally 0.5 kPa and PIP 2.5 kPa.
The T-piece connector in these systems connects onto special sized neonatal
resuscitation masks. Air flows can range between 5 l/min and 15 l/min at specified
pressures. T-piece circuits also typically include valves than can control the timing and
flows of PEEP and PIP pressures.
Special sized and shaped masks have been designed and made to accompany
neonatal resuscitation equipment. These masks are specifically designed to conform
comfortably to an infant’s face, facilitating an anatomical seal for the purposes of
resuscitation and to meet all the other critical respiratory requirements mentioned above.
However these masks are required to fit the neonates face and make (ideally)
100% seals on the neonate’s skin for the accurate delivery of PIP and PEEP pressures,
no dead space and accurate flow rates. Due to the accurate pressures required mask
leakage is the single biggest problem in neonatal resuscitation. In some studies, 14%
leakage is found with experienced operators.
Prior art neonatal resuscitation masks require a hand technique to seal, it’s very
difficult to maintain the seal and keep the baby’s head in the correct position (called the
sniffing position) to facilitate open airways for lung inflation. The technique requires both
pushing and pulling which is very trying under life and death situations.
The implementation of the present invention to be discussed below includes a
mask structure (shape, material, flexibility, hardness) and mask function (gas flow, gas
pressure, face adherence, suction pressure and flow) intended to conform to newborn
structure (anatomy of head, respiratory system) and newborn function (physiology of
respiratory system). Due to the design of the mask the required head positioning (sniffing
position) is now not required as the mask design has facilitated such accurate delivery of
pressures and flows that even slightly restricted airways are not problematic.
It will be understood that the requirements for adult resuscitation and other uses
are significantly different from the neonatal application discussed in detail. However, the
general principle may be applied to other applications, for example in adults, with suitable
modifications to structures, materials, dimensions and other characteristics.
The present invention has particular advantages where a positive pressure is
required to be delivered, as in suitable implementations it allows for an effective seal to
be created by suction, so that a positive pressure medical gas can be delivered. However
it is also applicable to situations where this is not required.
The term airway when used throughout the specification and claims refers to the
mouth, the nose or both, as is appropriate for the particular application.
Figures 1 and 2 illustrate an implementation of the present invention suitable for
use in neonatal resuscitation. Figure 1 shows the device 10, with a connection 20 to a
neonatal resuscitation machine, and more particularly to a source of air. The air may be
mixed with some additional oxygen, but for the purposes of simplicity of description, it will
be assumed that it is simply air.
Air connection 20 is shown as a conventional input connection for masks for
neonatal resuscitation machines, however, it will be appreciated that any suitable
connection could be used consistent with the source of air.
Device 10 is generally dome shaped, as is conventional, and is formed from a
flexible material, so that device 10 can be deformed so that the seal 11 can engage the
skin of the infant, and form a seal around their nose and mouth. Suction connection 21
is shown, again with a shape adapted to allow conventional suction systems to be readily
connected.
Figure 2 illustrates the underside of device 10. The seal 11 is formed by outer
wall 12, and inner wall 13, which define a channel 14 between them. This channel is
connected via opening 22 to connection 21, and hence to a source of suction. Hence, in
use, when a source of suction is connected to connection 21, the pressure is lowered in
channel 14, and it will adhere to an adjacent surface.
Opening 25 is the open end of connection 20, and opens into the generally open
interior chamber 17 of device 10. Hence, in use, a source of suction (not shown) is
connected to connection 21, and a source of air (not shown) to connection 20. Device
may then be positioned over the mouth and nose of the infant, in the conventional
way. However, instead of having to awkwardly hold the mask and the infant, the
practitioner can place device 10 in position and allow the suction to seal device 10 to the
face of the infant, while attending to the correct support and positioning of the infant. The
mask will, under the correct conditions, retain itself in position.
It will be appreciated that while the shape and arrangement illustrated are
preferred, it is possible to use the present invention with different shaped masks in
suitable applications. The suction chamber on different implementations of the device
could extend continuously as shown, or in suitable applications may be discontinuous, so
that suction is only at particular points. The shape of the suction chamber could be
different to the mask, or it may more closely follow the shape of the individual face, rather
than simply being annular. The suction chamber could more closely follow the exact
shape of the engagement between the face and the mask. The present invention is not
limited in application to a particular shape or dimension for the suction chamber.
As will be described below, the mask is intended to be connected via connection
21 to the low pressure suction connection of an infant resuscitation machine. This will
typically operate at around 2.0 kPa.
Connection 20 is intended to be connected to conventional T piece 40 (figure 4) and then
the resuscitation outlet of an infant resuscitation machine. Typically, an ISO male 15mm
fitting is provided. The mask is preferable formed from cast silicone rubber. The preferred
material is a medical grade silicone. Other suitable material may be used. The materials
are preferable inert and biocompatible. The necessary degree of flexibility and resilience
is required to allow the mask to conform to the face of the user. It will be appreciated that
Apart from the inclusion of a suction chamber, the mask may be constructed and
configured in a similar manner to existing commercially available masks, using
conventional manufacturing processes.
The mechanical properties of the mask will be affected not only by the material
chosen, but also by wall thicknesses, the overall shape, and the details of construction,
as will be understood by those skilled in the art. The walls of the suction chamber must
be sufficiently rigid to retain the vacuum, but the mask must also deform to the shape of
the face in order to work and seal effectively.
For example, in region 30, it has been determined that additional reinforcing
material, i,e, thickness, is required to ensure that the connection 20 remains upright and
does not collapse under load. On the other hand, it is important that material in region 31
has sufficient flexibility to allow for the mask to conform to different face shapes.
In the design illustrated, it has been found that it is critical to get the correct
balance between flexibility and stiffness, so that the mask can deform without the walls
collapsing. It is preferred in this implementation that the Shore hardness of the material
be 35 to 45, most preferably 40.
The seal structure 11 includes inner wall 12 and outer wall 13, with the channel
14 between, which in use is evacuated by the suction system. It will be noted that the
outer wall extends further in the direction of the airway opening 28. This creates an angle
relative to the centre of chamber 17. In a preferred form, this angle is about 30 degrees
for an infant. The difference in height provides better conformity to the shape of the face
of the patient. The opening 28, for a pre term or full term neonate, varies in preferred
width from 20 to 38 mm in this example.
Mask 10 includes a relatively small internal chamber 17. It is preferred to minimise the
chamber volume, so that there is as little dead space as possible during operation of the
resuscitation system.
The generally circular shape of the device, with the suction connection 21 located
peripherally, allows for the mask to be placed so that the connection 21 can be placed in
the most convenient position relative to the hose 42 and patient 43 whilst maintaining an
effective seal.
The mask must be operated using suction at an appropriate level, balancing firm
attachment with avoiding an unnecessarily tight connection. It has been determined in
the implementation described that suction pressures between 25 & 45 kPa are suitable.
The suction can be provided by connecting to any medical suction device delivering those
pressures. Most resuscitation machines have suction units attached. These suction
machines generally have control mechanisms on them which will allow for this range to
be met.
It will be understood that a particularly advantageous aspect of the illustrated
implementation is that the vacuum is only applied to a relatively small annular space 14,
rather than a larger volume with mask 10. This minimises the mechanical requirements
on the mask, as only limited areas have a relative vacuum on one side, and increased
pressure on the other. Hence, there is no tendency for the main chamber 17 to collapse
because the activation of the suction system. The present invention is suitable for use
with any suitable device. For example, it can be used with devices such as the
Resusitaire ® device available from Draeger Australia Pty Ltd, the Optiflow Junior device
available from Fisher & Paykel Healthcare, and the Giraffe infant resuscitation device
available from GE Healthcare.
It is particularly noted that the above referenced devices include a suction
capability, which can be readily employed with the present invention. Alternatively,
hospital suction systems may be employed. By suction is meant a system to provide a
negative pressure, so that gas is withdrawn and the reduced pressure in the suction
chamber relative to the atmosphere provides a retaining force (assuming the pressure
reduction is of sufficient size).
A suitable mode of operation for infant resuscitation will now be described. Note
that it is not the intention here to fully instruct in the process of resuscitation- this is a
matter within the general knowledge of those skilled in the art. The present
implementation of the invention is concerned with how the mask is attached to the face
of the neonate.
As shown in figure 4, mask 10 is connected to a T piece 40 of conventional
construct ion. A connecting flexible pipe 41 provides a connection for positive
resuscitation airflows from the resuscitation machine (not shown). Mask 10 is also
connected to flexible hose 42 and thereby to the low pressure suction connection of the
resuscitation machine.
As shown, the mask 10 is positioned over the airways, both the nose and mouth,
of the neonate 43. It can be seen that the mask 10 is well conformed to the face 44 of
the neonate 43. Thus, air or air/oxygen mix can be supplied via mask 10 to the neonate
43the suction will retain the mask in place, while the positive pressure medical gas is
supplied through mask 10. After initial positioning, the mask will not need to be held in
place, the suction will in normal course hold mask 10 in position over the airway.
It will be appreciated that the present invention may also be applied with other
means to assist in retaining a mask, for example straps or the like also being employed,
in some applications if required.
The connections to suction and to medical gases are shown as conventional
connections to neonatal resuscitation machines. It will be appreciated that different
connections to the respective portions of the mask, which could be any suitable passage
from the corresponding interior structure to the exterior connection or system, could be
used. For example, the mask could be integral with the T piece device. The mask could
be integrally connected to the appropriate pipes or hoses for connection to a suitable
machine. No particular mode of connection is dictated in order to implement the present
invention.
It will be appreciated that variations and additions are possible within the general
inventive scope, and that all such variations and additions are encompassed with the
present disclosure. All references to patent and other documents are hereby incorporated
by reference into the description.
Claims (14)
1. A mask for the delivery of a medical gas under positive pressure, the mask including a single shell forming a chamber having an outlet, a first passage connecting the chamber to the exterior of the mask, a sealing recess isolated from the chamber and open to the interior of the mask, and extending around the periphery of the outlet, and a second passage connecting the sealing recess to the exterior of the mask, the arrangement being such that operatively the mask may be placed on a user so as to cover the nose and mouth, suction may be connected to the second passage so that the sealing recess seals the mask against the face of the user, and a medical gas may be supplied to the first passage for delivery through the outlet to the user.
2. A mask according to claim 1, wherein the mask is operatively adapted to be retained in position on the user by the sealing recess. according to claim 1 or claim 2, wherein the sealing recess extends
3. A mask around the airway.
4. A mask according to any one of the preceding claims, wherein the sealing recess extends continuously around the periphery of the outlet. of the preceding claims, wherein the mask is
5. A mask according to any one formed so as to operatively resiliently deform and accommodate the shape of the face of a user. of the preceding claims, adapted for infant
6. A mask according to any one resuscitation.
7. A mask according to any one of the preceding claims, wherein the mask has a unitary construction. as a single
8. A mask according to claim 7, wherein the mask is formed moulded article. against n the face of a user, so that a medical
9. A method for retaining a mask gas may be delivered under positive pressure, including: This data, for application number 2015200443, is current as of 201603 21:00 AEST (a) providing a mask including a chamber with an outlet, a sealing recess isolated from the chamber, open to the interior of the mask, and extending around the periphery of the outlet; (b) connecting the chamber to a source of medical gas and the sealing recess to a suction system, (c) placing the mask over an airway of a user; (d) operating the suction system so that the mask is retained against the face, so that the medical gas may be delivered.
10. A method according to claim 9, wherein the mask is operatively sealed to the face of the user, so that a positive pressure medical gas may be delivered through the chamber.
11. A method according to claim 9 or claim 10, wherein the sealing recess extends around the airway.
12. A method according to any one of claims 9 to 11, wherein the sealing recess extends continuously around the periphery of the outlet. the mask is
13. A method according to any one of claims 9 to 12, wherein formed so as to resiliently deform and operatively accommodate the shape of the face of a user.
14. A method according to any one of claims 9 to 13, wherein the method is adapted for infant resuscitation. This data, for application number 2015200443, is current as of 201603 21:00 AEST -{to FIG 2 ,",-1C FIG 3 FIG 4
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2015900220 | 2015-01-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ725037A true NZ725037A (en) |
Family
ID=
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