WO2005016427A2 - Improved airway device - Google Patents
Improved airway device Download PDFInfo
- Publication number
- WO2005016427A2 WO2005016427A2 PCT/GB2004/003481 GB2004003481W WO2005016427A2 WO 2005016427 A2 WO2005016427 A2 WO 2005016427A2 GB 2004003481 W GB2004003481 W GB 2004003481W WO 2005016427 A2 WO2005016427 A2 WO 2005016427A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- airway
- cuff
- tube
- mould
- laryngeal
- Prior art date
Links
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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
-
- 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
- A61M16/0402—Special features for tracheal tubes not otherwise provided for
- A61M16/0409—Special features for tracheal tubes not otherwise provided for with mean for closing the oesophagus
-
- 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
- A61M16/0402—Special features for tracheal tubes not otherwise provided for
- A61M16/0415—Special features for tracheal tubes not otherwise provided for with access means to the stomach
-
- 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
- A61M16/0402—Special features for tracheal tubes not otherwise provided for
- A61M16/0431—Special features for tracheal tubes not otherwise provided for with a cross-sectional shape other than circular
-
- 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
- A61M16/0434—Cuffs
- A61M16/0436—Special fillings 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
- A61M16/04—Tracheal tubes
- A61M16/0434—Cuffs
- A61M16/0443—Special cuff-wall materials
-
- 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
- A61M16/0488—Mouthpieces; Means for guiding, securing or introducing the tubes
- A61M16/049—Mouthpieces
- A61M16/0493—Mouthpieces with means for protecting the tube from damage caused by the patient's teeth, e.g. bite block
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
Definitions
- the present invention relates to medical devices and is particularly applicable, but in no way limited, to laryngeal airway devices and to their methods of manufacture.
- An essential feature of certain embodiments of this device is a so-called buccal cavity stabiliser, located around the airway tube, and which is designed to nest with the anterior aspect of the patient's tongue.
- the laryngeal cuffs on these devices are generally non-inflatable, but rather are formed from a soft, deformable material that can adapt to the individual detail of the patient's laryngeal inlet to form a satisfactory seal. It was precisely because of the very soft, deformable nature of these cuffs that it was considered necessary to incorporate some form of stabiliser to locate the cuff during insertion and to maintain a good gas- tight contact with the laryngeal inlet at all times during use.
- a further objective of the present invention is to provide cost- effective methods for manufacturing airway devices that enable the unit cost per item to be minimised. It is also an object of this invention to satisfy the requirements of clinical situations where a buccal cavity stabiliser would not enhance, but impede the operation. For example in many opthamalogical, and maxillofacial or dental surgery the use of a reinforced tube are preferable, as the tube can flexibly moved to one side to continue to provide an airway for the patient, whilst not interfering with the operation.
- a buccal cavity stabiliser would not enhance, but impede the operation.
- an airway device for human or animal use comprising an airway tube having a distal end and a proximal end, the distal end of which is surrounded by a laryngeal cuff, wherein the cuff is non- inflatable and is pre-formed in a shape such that a face region of the cuff is adapted to fit snugly over the laryngeal inlet of a patient, and wherein the external profile of the tube is substantially uniform between the distal end of the tube where it starts to meet the cuff and the proximal end of the tube, and wherein the face region of the cuff is formed from a material with a Shore hardness on the A scale of between 0 to 30.
- the face region of the cuff is formed from a material of Shore hardness on the A scale of between 0 and 20 and more prefereably 0 to 5.
- the profile of the airway tube is substantially circular.
- the profile of the airway tube is substantially elliptical.
- the device further comprises a gastric tube passageway extending from the distal end of the airway tube to the proximal end of the cuff.
- the gastric tube passageway is housed substantially within the body of the device.
- the distal end exit of the gastric tube passageway exits the cuff centrally, that is along the line of the central longitudinal axis of the device.
- the distal end exit of the gastric tube passageway may be displaced to one side of the central longitudinal axis of the device If the end exit of the gastric tube passageway is displaced it is preferred that the distal end exit of the device is displaced to the right of the central longitudinal axis of the cuff, as viewed from the open face of the cuff, in other words to the right-hand side of the patient when the device is in use. This is for ease of manufacture.
- the device further comprises one or more flexible flanges extending around the opening in the face region of the cuff. Preferably the flexible flanges extend substantially around the entire circumference of the opening in the cuff.
- said device further comprises a connector adapted to connect the proximal end of the airway tube to a gas supply.
- said connector extends into said airway tube and at least part way along the length of said airway tube to act as a bite protector to prevent a patient from constricting the airway tube by biting on it.
- said connector fits into an internal annular recess at the proximal end of the airway tube such that the diameter, or internal cross-section of the airway tube where the tube is non-circular internally, remains substantially constant along the length of the tube when the connector is in place.
- the distal end of the connector abuts in use a shoulder in the airway tube to prevent the connector from passing into the airway tube beyond a certain point.
- This provides a positive fit for the connector which seats on a shoulder or recess within the tube, and results in lower resistance to airflow through the device.
- the face of the laryngeal cuff is adapted to form an anatomical fit over the laryngeal inlet of a patient incorporates protuberances designed to form a good seal with the pyriform fossae and aryepiglottic folds of the laryngeal inlet of the patient.
- the face of the laryngeal cuff adapted to form an anatomical fit over the laryngeal inlet of a patient incorporates protuberances designed to form a good seal with the valleculae, epiglottis, aryepiglottic folds, pyriform fossae and around the anterior aspect of thyroid & cricoid cartilages.
- the distal tip of the device positions itself into the recess created by the posterior aspect of the lower larynx below the posterior cartilages, above the opening of the oesophagus, not only to help create an airway seal but also to act as a physical wedge to prevent the possibility of regurgitation.
- the face of the laryngeal cuff adapted to fit anatomically over the laryngeal framework of a patient incorporates grooves designed to allow passage of vital arteries, veins and nerves supplying the laryngeal framework.
- the distal tip of the laryngeal cup is so sized and shaped as to remain above the upper oesophageal sphincter in use.
- the distal tip of the laryngeal cup is substantially concave in shape.
- the face of the laryngeal cuff and the airway tube are formed from materials of different Shore hardness. In an alternative embodiment the face of the laryngeal cuff and the airway tube are formed from material of substantially the same Shore hardness.
- the airway tube together with the back or dorsal part of the cuff are made from material of one Shore hardness and the face of the cuff is made from a material of a different Shore hardness, such that the face of the cuff is made of a softer material than the airway tube and the back or dorsal part of the cuff.
- an airway device suitable for human or animal use, said airway device comprising an airway tube having a distal end and a proximal end, the distal end of which is surrounded by a non-inflatable laryngeal cuff, said method comprising the steps of: (i) providing a mould, the mould including interior walls defining an interior volume which defines the shape of the airway device; (ii) introducing a liquid plastics material into the hollow interior volume of the mould; (iii) optionally introducing a second liquid plastics material into said mould where it is required that the airway device is made from materials of different Shore hardness; (iv) allowing the plastics material to solidify; (v) removing the airway device from the mould.
- said method also comprises the step of inserting into said mould a connector suitable for connecting to an anaesthetic gas supply, such that, after the moulding process is complete, the connector becomes attached to the airway device.
- a connector suitable for connecting to an anaesthetic gas supply such that, after the moulding process is complete, the connector becomes attached to the airway device.
- an airway device suitable for human or animal use comprising an airway tube having a distal end and a proximal end, the distal end of which is surrounded by a non-inflatable laryngeal cuff, said method comprising the steps of:-
- an airway device suitable for human or animal use, said airway device comprising an airway tube having a distal end and a proximal end, the distal end of which is surrounded by a non-inflatable laryngeal cuff, said method comprising the steps of:-
- said airway tube is formed by an extrusion process.
- Figure 1 illustrates front, side and rear elevational views of an airway device according to a first embodiment of the present invention having a substantially circular profile airway tube;
- Figure 2 illustrates various perspective views of the embodiment shown in Figure 1 ;
- Figure 3 shows front, side and rear elevational views of an airway device according to a second embodiment of the present invention having a substantially elliptical profile airway tube;
- Figure 4 illustrates various perspective views of the embodiment shown in Figure 3;
- Figure 5 illustrates various perspective views of an embodiment without a gastric tube passageway
- Figure 6 illustrates front, side and rear elevational views of an airway device according to a further embodiment of the present invention
- Figure 7 illustrates various perspective views of the embodiment shown in Figure 6;
- Figure 8 shows enlarged rear, side and front elevational views of a laryngeal cuff
- Figure 9 shows an enlargement of a cuff, detailing the split line between different plastics which would be present if the cuff is to be formed by materials of two different shore hardnessess;
- Figure 10 illustrates a connector which can also act as a bite protector
- Figure 11 illustrates a front elevational view of a laryngeal cuff in which the gastric tube passageway exits on the mid-line or centrally from the tip of the cuff.
- anatomical terms “anterior” and “posterior,” with respect to the human body refer to locations nearer to the front of and to the back of the body, respectively, relative to other locations.
- proximal means the end of the device, or portion thereof, closest to the connection to the anaesthetic breathing system.
- distal means the end of the device, or portion thereof, furthest from the anaesthetic breathing system or alternatively, the cuff end of the device.
- lateral refers to a location to the right or left sides of the body, relative to other locations.
- Bilateral refers to locations both to the left and right of the body, relative to other locations.
- the anatomical term “medial” or “medially” refers to a location toward the centre or midline of the body, relative to locations both to the left and right of the body. Referring to Figure 1, this illustrates front, side and rear elevations of an airway device according to a first embodiment of the present invention, generally shown as 10.
- This comprises an airway tube 11 , which at its proximal end 12 terminates in a 15mm or other connector 18 suitable for connection to an anaesthetic breathing system of conventional type.
- a laryngeal cuff or cup 14 Formed around the distal end 13 of the airway tube is a laryngeal cuff or cup 14 adapted in its shape and contours to correspond with the laryngeal inlet region of a patient.
- the terms cuff and cup have an equivalent meaning. They refer to the element of the device at the distal end of the airway tube that is adapted to cover and form a seal with the laryngeal inlet of the patient in use.
- the anatomy of the laryngeal inlet region of a human is well known to the expert.
- the cuff 14 has an opening 17 in a face or front region of the cuff and the back or dorsal part of the cuff is closed.
- the opening 17 in the face of the cuff connects directly to the airway tube 11 such that gas is free to flow from the connector 18 through the airway tube and out of the open face of the cuff.
- the particular cuff shown in Figure 1 incorporates in the cuff face pronounced and discernable bulges or protuberances 15, 16 designed to form a good seal with the piriform fossae and aryepiglottic folds.
- the outbulgings in the cuff at 15 and 16 are positioned antero-laterally to the laryngeal framework and give an anatomical seal by fitting into the piriform fossae and aryepiglottic folds and space postero-inferior to the thyroid and cricoid cartilages, and the posterior cartilages (corniculate and cuneiform).
- the face of the cuff is not a flat planar surface but includes regions that protrude above the general plane of the cuff face. Additionally, there may optionally be regions which lie below the general plane of the cuff face.
- Thin, flexible, featherlike flanges 20 and 21 extend substantially around the circumference of the opening 17 in the face region of the cuff. These flanges are preferably formed as an integral part of the moulding of the cuff and, because of the very soft nature of the material used to form the cuff, these flanges are particularly soft and pliable. Their purpose is to make allowance for any individual patient variation in the laryngeal inlet shape and to contribute to forming an efficient and effective seal between the cuff and the laryngeal structures.
- flanges 20 and 21 are spaced apart slightly such that each flange is an integral item or unit. The flanges are spaced radially one from another around the opening such that one flange surrounds another.
- radially in this context has a broad meaning and refers to the spacing of each flange from an imaginary axis extending out of the opening in a plane substantially perpendicular to the general plane of the cuff face. In this embodiment two feather flanges are shown. However, there may be no flanges, one flange or two or more than two flanges. In other words there may be none or a plurality of flanges, "plurality" having the meaning one or more in the context of this disclosure.
- a further feature of the cuff is the epiglottic rest 30 located at the proximal end of the cuff region.
- This epiglottic rest is sized and shaped so as to be anatomically positioned against the epiglottis, to ensure a proper seal and to hold the epiglottis back from downfolding towards the laryngeal inlet avoiding obstruction to airflow.
- This epiglottic rest takes the form of a leaf like structure extending out of the laryngeal cuff and directed back towards the proximal end of the airway tube. Its relative size and shape can be seen from 30A in Figure 9. The optimum size and shape for this epiglottic rest will be determined by experimentation. Turning now to the airway tube, this is shown generally as 11 in Figure 1.
- This tube which is in the form of a hollow cylinder of substantially uniform cross-section open at each end, extends from the connector end 12 into the body of cuff 14 to connect with cuff opening 17.
- the inside diameter of the airway tube will depend on the size of the device, generally larger in adult sizes versus paediatric sizes, and designed in general to accommodate the appropriately sized endotracheal tube for endoscope guided intubation where necessary.
- the internal diameter of the tube may be substantially uniform along its length, although the internal diameter may vary.
- the airway also has significant benefits over inflatable laryngeal cuffs during retrograde intubation procedures. This is because inflatable cuffs can potentially be punctured and deflated, which could result in lack of seal and problems with ventilation.
- the tube is formed from a bendable plastics material that will be described in more detail below.
- the external profile of the tube is substantially uniform between the distal end of the tube where it starts to meet the cuff and the proximal end of the tube.
- substantially uniform means that there is no region of the tube which could act as a buccal cavity stabiliser ie an expanded region extending on either side of the airway tube. Put another way, there is no section of the tube that extends on either side of the tube and which is generally broader in profile than the airway tube itself.
- the internal diameter of the airway tube will preferably be substantially uniform and circular, whether the tube has a circular or oval exterior profile, and the distal opening of the airway tube into the cuff is a single opening to help reduce the resistance to flow through the device.
- the airway tube can be formed with a variety of profiles. In the embodiment illustrated in Figures 1 and 2 the general external profile of the airway tube is substantially circular. This can be seen most clearly in Figure 2D. In contrast, in the embodiment illustrated in Figures 3 and 4, the airway tube has a generally elliptical external profile, although the bore passing through the airway tube is substantially circular in cross-section. These are just two of many profiles that might be selected by the designer.
- a connector 118 which fits into the end of the airway tube is shown in more detail in Figure 10.
- the length of the connector is significantly greater than a conventional connector and is such that it extends, in use, into the patient's mouth and beyond his/her teeth. In that way it acts as a bite protector and prevents the patient from inadvertently biting through the relatively soft material of the airway tube.
- the patient biting down onto the airway device and particularly or completely occluding airflow is a problem in certain procedures and with certain patients.
- the connector fits into a recess formed within the airway tube by the moulding process. In this way, the internal surface of the airway tube 109 is substantially smooth and uniform.
- the internal diameter of the tube from the proximal opening in the connector to the distal end where it opens out into the cuff is substantially uniform. There is therefore no significant step change in internal diameter at the inner end of the connector, which leads to improved airflow and lower resistance to flow.
- This arrangement is shown particularly in Figure 10C being a section along line E-E.
- the embodiments shown in Figures 1 to 4 inclusive include a second passageway 40 that extends from an opening 42 in the distal end of the device to an opening 41 in the proximal end of the device.
- This second, gastric tube passageway is designed to allow an operator to pass a gastric tube down into the stomach of a patient without interrupting anaesthesia, during EMS or during pre-hospital airway management.
- This second passageway also allows for detection of any gastric aspirate in the event of passive regurgitation during use.
- This second passageway must be large enough to allow a small bore gastric tube to pass easily through the device.
- a gastric tube passageway would be between 6 to 14 French gauge diameter.
- the gastric tube passageway 40 and 140 shown in Figures 1 and 3 is shown housed substantially within the body of the airway device. However, it is also possible that this passageway could run externally of the new main body, for example laterally or along the dorsal face of the device body.
- passageways in these embodiments are displaced to one side of the central longitudinal axis of the device, in this case to the right-hand side of the central longitudinal axis, as viewed from the open face of the cuff.
- the passageway which is optional, could just as well exit along the mid-line or on the central longitudinal axis of the device as illustrated by 242 in Figure 11.
- Figure 7 A further embodiment is illustrated in Figure 7.
- a laryngeal cuff is formed around a pre-formed or pre-cut piece of airway tube. This has the cost advantage that the airway tube may be formed from relatively inexpensive PVC tube or the like with a connector in one end and the cuff moulded over the other end.
- the airway tube may be circular in profile or elliptical or any other profile as selected by the designer.
- Figures 1B and 3B and 6B amongst others show the generally curvilinear shape of the device along its longitudinal axis. This shape is designed to correspond with the mouth/throat opening in an anaesthetised patient. Whilst the device is flexible it is resiliently deformable and tends to return to this concave/convex shape in its unstressed state. In addition to passing tubes or other items through the gastric tube passageway, it is possible to pass items such as a guide wire directly into the trachea through the airway tube.
- the device may be constructed from any suitable plastics material as selected by the materials specialist. Latex-free medical grade silicone rubber is one preferred material.
- the cuff should be soft in texture to avoid undue damage to the surrounding tissue.
- Other suitable materials for construction of this type of device include, but are not limited to, Poly Vinyl Chloride (PVC), Thermoplastic Elastomers such as the styrenic block copolymers (eg Styrene Butadiene Styrene (SBS), Styrene Ethylene Butylene
- SEBS Styrene
- TPO Thermoplastic Olefin Blends
- TPU Thermoplastic PolyUrethanes
- TSV Thermoplastic Vulcanisates
- CO Copolyester
- PEBAX Polyether Block Amides
- EVA Flexible Co-polymers
- foamed versions thereof where appropriate.
- a further important factor involved in the choice of a suitable material is transparency.
- the material or materials of construction should be substantially clear or transparent. This enables the anaesthetist or operator to see the inner lumen of the airway to check for blockages or other problems.
- transparent materials are known to the materials specialist.
- softness (hardness) range on the Shore A scale of
- Hardness a hardness of less than 30 for the face of the cuff that contacts the laryngeal inlet is optimum. By way of a preferred range, a value on the same scale of between 0 to 20 is preferred, with a particularly preferred range of 0 to 5.
- the apparent softness of the cuff can be further adapted by forming cavities or channels within the body of the cuff itself.
- the cuff may be pre-filled with a fluid such as air, or other non-toxic gas, or a non-toxic liquid.
- the term fluid has a broad meaning and includes any suitable gas, liquid, vapour or mixtures or combination thereof and will be determined and designed by an expert in this field of anatomy/anaesthesia in conjunction with the materials specialist.
- the cuff will be constructed of such a material which will not allow nitrous oxide (anaesthetic gas) to diffuse through the material to any significant amount so that the extra luminal pressure is kept constant. It follows therefore that the cuff should be substantially impermeable to the fluid with which is filled and to anaesthetic gases.
- the cuff can be formed from a soft, foamed material or can be foam filled. In either case this provides a soft deformable but shaped surface around the face of the cuff to engage over the anatomy of the laryngeal inlet region. Such a foam filled device will minimise any potential damage to the structures in that region whilst still providing a substantially complete seal.
- the centre of the bore of the airway tube can be displaced to one side of the central or mid-line axis of the airway tube itself. This displacement provides space for the gastric tube passageway to run alongside the bore of the airway tube.
- the gastric tube passageway is, in effect, housed within the outer body of the airway tube. This arrangement makes for a neat, streamlined appearance in comparison to the arrangement in which the gastric tube passageway is external to or mounted on the back of the device.
- FIG. 1 B shows a so-called “split line" 32 between the softer plastics material on the face of the cuff and slightly firmer material on the dorsal or back part of the cuff 19.
- This line is shown in a slightly different position in Figure 9, where it is shown as feature 132.
- the sides are therefore more easily deformed which contributes significantly to the ease of insertion, and removal, of the cuff during use.
- the cuff squeezes and seals into the space above the laryngeal inlet, cupping the laryngeal inlet to create a good seal for ventilation.
- the airway opening increases in depth. This increase in depth reduces the likelihood of the epiglottis occluding the airway during ventilation, a problem with prior art devices.
- one method of making an airway device according to the present invention is to provide a mould, the mould including interior walls which define the shape of the airway device, and injecting into said mould a molten thermoplastic compound. Once cooled the item is ejected from the mould.
- a two-shot process in which molten thermoplastic compound of a first hardness is first injected into the mould, which is retained in a pre-determined position such that only a pre-determined portion of the mould is filled with polymeric material.
- a second molten thermoplastic compound is then injected into the remaining space in the mould to complete the injection moulding process.
- the relatively firmer airway tube and dorsal portion of the cuff can be formed first and the relatively softer face of the cuff can be formed in the second part of the operation.
- the face of the cuff can be formed first and the remainder of the device is formed in the second part of the operation.
- an airway tube is formed in a first step, either by extrusion or cutting a pre-determined length from a longer length of tubing.
- a mould defining a hollow space which will become the cuff region in the finished product is then placed around the airway tube and thermosetting plastic is injected into the mould in a one-step or a two-step process.
- a mould defining the cuff region is used to produce a cuff by either a one-step or a two-step injection moulding process.
- the cuff produced from this mould includes a recess adapted to accept an airway tube.
- an airway tube is formed by extrusion or in some other manner.
- the moulding process may be used to mould not only the laryngeal cuff on to the end of a pre-formed airway tube, but also a soft coating over the airway tube itself. Whilts this requires a larger mould, and more plastics material, it has the advantage that the finished device has a uniform finish over substantially the whole of its outer surface. It is softer for the patient and more aesthetically appealing for the operator. Having a pre-formed airway tube running most of the length of the device gives a degree of resilience and rigidity which is particularly helpful when using very soft plastics material.
- plastics materials used in these methods of manufacture these will be determined by the materials specialist and are generally only limited by the ability to bond the chosen materials together.
- typically PVC can be used to mould the airway tube, the whole of the cuff region, the dorsal portion of the cuff region or any seals between these components.
- Polyolefins such as polyethylene and polypropylene or a polyurethane can be used to form the airway tube and/or the dorsal portion of the cuff region.
- a thermoplastic elastomer or a silicone rubber can be used to form the airway tube, the face of the cuff, the dorsal portion of the cuff, the whole of the cuff and any secondary seals therebetween.
- bond has a particularly broad meaning. It encompasses any method or process in which two or more parts are permanently joined together. It includes, but is in no way limited to, molecular bonding, glueing using chemical adhesives, welding, including ultrasonic welding. The preferred method or methods of bonding will be selected by the materials specialist in this area.
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- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Veterinary Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Otolaryngology (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Prostheses (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- Window Of Vehicle (AREA)
- Accommodation For Nursing Or Treatment Tables (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- External Artificial Organs (AREA)
Abstract
Description
Claims
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/568,362 US7806119B2 (en) | 2003-08-14 | 2004-08-13 | Airway device |
JP2006523053A JP4963959B2 (en) | 2003-08-14 | 2004-08-13 | Improved airway device |
AT04768048T ATE549053T1 (en) | 2003-08-14 | 2004-08-13 | IMPROVED AIRWAY DEVICE |
EP04768048A EP1654025B1 (en) | 2003-08-14 | 2004-08-13 | Improved airway device |
ES04768048T ES2383896T3 (en) | 2003-08-14 | 2004-08-13 | Enhanced airway device |
AU2004264714A AU2004264714B2 (en) | 2003-08-14 | 2004-08-13 | Improved airway device |
CN2004800233824A CN1835776B (en) | 2003-08-14 | 2004-08-13 | Improved airway device |
CA2535849A CA2535849C (en) | 2003-08-14 | 2004-08-13 | Improved airway device |
US10/983,199 US8215307B2 (en) | 2002-08-14 | 2004-11-05 | Airway device |
US12/627,844 US10040231B2 (en) | 2002-08-14 | 2009-11-30 | Airway device |
US12/859,169 US8485188B2 (en) | 2003-08-14 | 2010-08-18 | Airway device |
US13/403,806 US8778248B2 (en) | 2002-08-14 | 2012-02-23 | Method of manufacturing an airway device |
US14/315,149 US9475223B2 (en) | 2002-08-14 | 2014-06-25 | Method of manufacturing an airway device |
US14/315,141 US9266268B2 (en) | 2002-08-14 | 2014-06-25 | Method of manufacturing an airway device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0319133.5 | 2003-08-14 | ||
GB0319133A GB2393399B (en) | 2002-08-14 | 2003-08-14 | Improved airway device |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10568362 A-371-Of-International | 2004-08-13 | ||
US12/859,169 Division US8485188B2 (en) | 2003-08-14 | 2010-08-18 | Airway device |
Publications (2)
Publication Number | Publication Date |
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WO2005016427A2 true WO2005016427A2 (en) | 2005-02-24 |
WO2005016427A3 WO2005016427A3 (en) | 2005-03-31 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2004/003481 WO2005016427A2 (en) | 2002-08-14 | 2004-08-13 | Improved airway device |
Country Status (12)
Country | Link |
---|---|
US (2) | US7806119B2 (en) |
EP (1) | EP1654025B1 (en) |
JP (1) | JP4963959B2 (en) |
CN (1) | CN1835776B (en) |
AT (1) | ATE549053T1 (en) |
AU (1) | AU2004264714B2 (en) |
CA (1) | CA2535849C (en) |
ES (1) | ES2383896T3 (en) |
GB (1) | GB2404863B (en) |
PT (1) | PT1654025E (en) |
WO (1) | WO2005016427A2 (en) |
ZA (1) | ZA200601332B (en) |
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Also Published As
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PT1654025E (en) | 2012-06-15 |
ATE549053T1 (en) | 2012-03-15 |
CN1835776A (en) | 2006-09-20 |
US20060207601A1 (en) | 2006-09-21 |
GB2404863B (en) | 2008-05-14 |
GB0418050D0 (en) | 2004-09-15 |
ZA200601332B (en) | 2007-05-30 |
JP4963959B2 (en) | 2012-06-27 |
CA2535849C (en) | 2013-03-26 |
CA2535849A1 (en) | 2005-02-24 |
EP1654025A2 (en) | 2006-05-10 |
US8485188B2 (en) | 2013-07-16 |
WO2005016427A3 (en) | 2005-03-31 |
CN1835776B (en) | 2011-08-31 |
US20100319704A1 (en) | 2010-12-23 |
GB2404863A (en) | 2005-02-16 |
AU2004264714B2 (en) | 2010-07-29 |
AU2004264714A1 (en) | 2005-02-24 |
US7806119B2 (en) | 2010-10-05 |
ES2383896T3 (en) | 2012-06-27 |
EP1654025B1 (en) | 2012-03-14 |
JP2007502137A (en) | 2007-02-08 |
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