CA2219860A1 - Laryngeal mask airways and their manufacture - Google Patents
Laryngeal mask airways and their manufacture Download PDFInfo
- Publication number
- CA2219860A1 CA2219860A1 CA002219860A CA2219860A CA2219860A1 CA 2219860 A1 CA2219860 A1 CA 2219860A1 CA 002219860 A CA002219860 A CA 002219860A CA 2219860 A CA2219860 A CA 2219860A CA 2219860 A1 CA2219860 A1 CA 2219860A1
- Authority
- CA
- Canada
- Prior art keywords
- mount member
- mask portion
- web
- ring
- patient end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
- A61M16/0434—Cuffs
- A61M16/0445—Special cuff forms, e.g. undulated
Abstract
Known laryngeal mask assemblies have a mask portion of elliptical shape that is inflatable at the patient end to seal in the region of the hypopharynx. In the present invention the assembly has a mount and an inflatable member attached to the mount. The inflatable member is formed by heat bonding together opposite walls of a flat balloon and at the same time cutting an aperture through the walls, so as to form a central web within an outer inflatable ring. The central web is attached to a concave surface on the forward surface of the mount with the aperture in the web aligned with an opening in the mount.
Description
Larvn~eal Mask Airways and their Manufacture Background of the Invention This invention relates to laryngeal mask airways and their manufacture It is common practice to use an airway known as a laryngeal mask for the ~(lmini~tration of anaesthetic and ventilation gases to a patient. These airways comprise a tube with an inflatable mask or cuff at one end, the tube being inserted in the patient's mouth so that one end is located in the hypopharynx and so that the mask forms a seal in this region with the surrounding tissue. Laryngeal masks are described in, for example, US 5355879, US
5305743, US 5297547, US 5282464, GB 2267034, US 5249571, US 5241956, US 5303697,GB 2249959, GB 2111394, EP 448878, US 4995388, GB 2205499, GB 2128561 and GB2298797.
Laryngeal masks have several advantages over endotracheal tubes, which are longer and seal with the trachea below the vocal folds. It can be difficult, however, to manufacture the patient end of the mask at low cost.
Brief Summary of the Invention It is an object of the present invention to provide an improved laryngeal mask assembly and method of manufacture.
According to one aspect of the present invention there is provided a laryngeal mask assembly including a mask portion and an elongate tube that opens at its forward, patient end into the mask portion, the mask portion being adapted during use to locate in the hypopharynx and to open on its forward side to the patient's airway, the mask portion having a mount member attached with the patient end of the tube, the mount member being generally elliptical, the tube opening at the patient end of the assembly via an opening on the forward surface of the mount member, and the mask portion having an inflatable member comprising an inflatable ring and a central web extending within said ring, the web being attached to the forward surface of the mount member and having an aperture therein aligned with the opening in said mount member.
According to another aspect of the present invention there is provided a method of manufacture of a laryngeal mask assembly of the kind including a mask portion and an elongate tube that opens at its forward, patient end into the mask portion, the mask portion being adapted during use to locate in the hypopharynx and to open on its forward side to the patient's airway, the method including the steps of providing a mount member at the patient end of the tube, forming an inflatable member comprising an inflatable ring and a web within the ring, and attaching the web to the mount member so as to secure the inflatable member with the mount member.
The inflatable member may be made by providing a generally elliptical balloon and securing opposite walls of the balloon together in a central region so that the central region provides said web and the region around the central region provides said inflatable ring.
A laryngeal mask assembly and its method of manufacture, according to the present invention, will now be described, by way of example, with reference to the accompanying drawings.
Brief Description of the Drawings Figure 1 is a partly-sectional side elevation view of the assembly;
Figure 2 is a view of the forward end of the assembly along the arrow II of Figure 1;
Figures 3 and 4 illustrate steps in the manufacture of the inflatable member.
Detailed Description of the Preferred Embodiment With reference to Figures 1 and 2, the assembly comprises a bendable tube 1 of aplastics material, such as PVC, with a coupling 10 at its machine end 12. The tube 1 is curved along its length and has a mask portion 13 at its patient end 14.
The tube 1 is extruded with an inflation lumen 2 within its wall. The lumen 2 isconnected towards the machine end of the assembly to an inflation line 3 with an inflation indicator and connector 4. The opposite, patient end of the inflation lumen 2 opens into the mask portion 13, through a hole or slot 5 formed in the outside of the tube 1.
The mask portion 13 comprises a mount member 15 and an expandable or inflatable assembly 16. The mount member l S is moulded from a relatively stiff plastics material, such as PVC. The mount member 15 has a hollow cylindrical sleeve 17 at its rear end, in which the forward, patient end of the tube l is inserted and joined. The forward, patient end 18 of the mount member 15 is of an inverted dish shape with a generally elliptical or egg-shape outline and with a concave surface or recess 19. A bore 22 extends forwardly through the mount member 15, as a continuation of the bore through the sleeve 17, and forms an opening into the rear part of the recess 19. The hole or slot 5 in the tube 1 opens into a passage 23 through the mount member 15.
The inflatable assembly 16 comprises an expandable or inflatable outer ring 24 of circular section and egg shape with an integral, flexible, central web 25 within the ring. The ring 24 could have other shape sections, such as oval or elliptical. The diameter of the ring 24 towards the rear, machine end is slightly greater than that at the forward, patient end. The web 25 has the same shape as the underside of the mount member 15, that is, it is concave when viewed from beneath. An aperture 26 through the web 25 is aligned with the opening of the bore 22 in the mount member 15. A spigot 27 projects upwardly from the ring 24 and is sealed within the passage 23 in the mount member 15 so that the inflation lumen 2 opens into the ring 24. The inflatable member 16 is attached to the mount member 15 by means of an adhesive between the upper surface of the web 25 and the surface of the recess 19 so that the ring 24 projects beyond the mount member around its perimeter. Adhesive is also applied in the region of the passage 23, where the mount member has a shallow concave recess 28 shaped to receive a part of the ring 24 around the spigot 27.
The inflatable member 16 can be readily manufactured from a flexible plastics material, such as PVC, polyurethane, silicone, EVA, TPE, polyether block amide or the like.
In one method of manufacture, a flat balloon 30 is first blow moulded having the egg-shape outline of the assembly but with substantially flat upper and lower surfaces 31 and 32 and an open interior 33, as shown in Figure 3. The balloon 30 is then placed between two dies 34 and 35, which are brought together to force the upper and lower surfaces 31 and 32 into contact in the central region only, leaving the surfaces separate in the peripheral region, as shown in Figure 4. The dies 34 and 35 are heated so that the upper and lower surface heat bond together in the central region to form the web 25, the peripheral region outside the central region forming the inflatable ring. Alternatively, the bond could be made by RF welding. The die surfaces have complementary profiles, defining the finished shape of the web, and cutting edges 36 to form the aperture 26 in the web. The spigot 27 may be formed during the initial blow moulding process or attached subsequently. The aperture 26 could have a series of holes or slits to prevent entry of the epiglottis.
The airway can be easily manufactured in this way at low cost.
The expandable member 16 could contain a foam material so that it naturally adopts an inflated or expanded state and is deflated by the action of suction. The foam may be inserted in the ring after attaching the expandable member to the mount member.
5305743, US 5297547, US 5282464, GB 2267034, US 5249571, US 5241956, US 5303697,GB 2249959, GB 2111394, EP 448878, US 4995388, GB 2205499, GB 2128561 and GB2298797.
Laryngeal masks have several advantages over endotracheal tubes, which are longer and seal with the trachea below the vocal folds. It can be difficult, however, to manufacture the patient end of the mask at low cost.
Brief Summary of the Invention It is an object of the present invention to provide an improved laryngeal mask assembly and method of manufacture.
According to one aspect of the present invention there is provided a laryngeal mask assembly including a mask portion and an elongate tube that opens at its forward, patient end into the mask portion, the mask portion being adapted during use to locate in the hypopharynx and to open on its forward side to the patient's airway, the mask portion having a mount member attached with the patient end of the tube, the mount member being generally elliptical, the tube opening at the patient end of the assembly via an opening on the forward surface of the mount member, and the mask portion having an inflatable member comprising an inflatable ring and a central web extending within said ring, the web being attached to the forward surface of the mount member and having an aperture therein aligned with the opening in said mount member.
According to another aspect of the present invention there is provided a method of manufacture of a laryngeal mask assembly of the kind including a mask portion and an elongate tube that opens at its forward, patient end into the mask portion, the mask portion being adapted during use to locate in the hypopharynx and to open on its forward side to the patient's airway, the method including the steps of providing a mount member at the patient end of the tube, forming an inflatable member comprising an inflatable ring and a web within the ring, and attaching the web to the mount member so as to secure the inflatable member with the mount member.
The inflatable member may be made by providing a generally elliptical balloon and securing opposite walls of the balloon together in a central region so that the central region provides said web and the region around the central region provides said inflatable ring.
A laryngeal mask assembly and its method of manufacture, according to the present invention, will now be described, by way of example, with reference to the accompanying drawings.
Brief Description of the Drawings Figure 1 is a partly-sectional side elevation view of the assembly;
Figure 2 is a view of the forward end of the assembly along the arrow II of Figure 1;
Figures 3 and 4 illustrate steps in the manufacture of the inflatable member.
Detailed Description of the Preferred Embodiment With reference to Figures 1 and 2, the assembly comprises a bendable tube 1 of aplastics material, such as PVC, with a coupling 10 at its machine end 12. The tube 1 is curved along its length and has a mask portion 13 at its patient end 14.
The tube 1 is extruded with an inflation lumen 2 within its wall. The lumen 2 isconnected towards the machine end of the assembly to an inflation line 3 with an inflation indicator and connector 4. The opposite, patient end of the inflation lumen 2 opens into the mask portion 13, through a hole or slot 5 formed in the outside of the tube 1.
The mask portion 13 comprises a mount member 15 and an expandable or inflatable assembly 16. The mount member l S is moulded from a relatively stiff plastics material, such as PVC. The mount member 15 has a hollow cylindrical sleeve 17 at its rear end, in which the forward, patient end of the tube l is inserted and joined. The forward, patient end 18 of the mount member 15 is of an inverted dish shape with a generally elliptical or egg-shape outline and with a concave surface or recess 19. A bore 22 extends forwardly through the mount member 15, as a continuation of the bore through the sleeve 17, and forms an opening into the rear part of the recess 19. The hole or slot 5 in the tube 1 opens into a passage 23 through the mount member 15.
The inflatable assembly 16 comprises an expandable or inflatable outer ring 24 of circular section and egg shape with an integral, flexible, central web 25 within the ring. The ring 24 could have other shape sections, such as oval or elliptical. The diameter of the ring 24 towards the rear, machine end is slightly greater than that at the forward, patient end. The web 25 has the same shape as the underside of the mount member 15, that is, it is concave when viewed from beneath. An aperture 26 through the web 25 is aligned with the opening of the bore 22 in the mount member 15. A spigot 27 projects upwardly from the ring 24 and is sealed within the passage 23 in the mount member 15 so that the inflation lumen 2 opens into the ring 24. The inflatable member 16 is attached to the mount member 15 by means of an adhesive between the upper surface of the web 25 and the surface of the recess 19 so that the ring 24 projects beyond the mount member around its perimeter. Adhesive is also applied in the region of the passage 23, where the mount member has a shallow concave recess 28 shaped to receive a part of the ring 24 around the spigot 27.
The inflatable member 16 can be readily manufactured from a flexible plastics material, such as PVC, polyurethane, silicone, EVA, TPE, polyether block amide or the like.
In one method of manufacture, a flat balloon 30 is first blow moulded having the egg-shape outline of the assembly but with substantially flat upper and lower surfaces 31 and 32 and an open interior 33, as shown in Figure 3. The balloon 30 is then placed between two dies 34 and 35, which are brought together to force the upper and lower surfaces 31 and 32 into contact in the central region only, leaving the surfaces separate in the peripheral region, as shown in Figure 4. The dies 34 and 35 are heated so that the upper and lower surface heat bond together in the central region to form the web 25, the peripheral region outside the central region forming the inflatable ring. Alternatively, the bond could be made by RF welding. The die surfaces have complementary profiles, defining the finished shape of the web, and cutting edges 36 to form the aperture 26 in the web. The spigot 27 may be formed during the initial blow moulding process or attached subsequently. The aperture 26 could have a series of holes or slits to prevent entry of the epiglottis.
The airway can be easily manufactured in this way at low cost.
The expandable member 16 could contain a foam material so that it naturally adopts an inflated or expanded state and is deflated by the action of suction. The foam may be inserted in the ring after attaching the expandable member to the mount member.
Claims (8)
1. A laryngeal mask assembly comprising: a mask portion, the mask portion being adapted during use to locate in the hypopharynx and to open on its forward side to the patient's airway; and an elongate tube that opens at its forward, patient end into said mask portion, wherein said mask portion has a mount member attached with a patient end of said tube, the mount member being generally elliptical and having an opening on its forward surface, wherein said tube opens at a patient end of said assembly via said opening in said mount member, wherein said mask portion has an expandable member comprising an expandable ring and a central web extending within said ring, and wherein said web is attached to said forward surface of said mount member and has an aperture therein aligned with said opening in said mount member.
2. A laryngeal mask assembly according to Claim 1, wherein said forward surface of said mount member is concave.
3. A laryngeal mask assembly according to Claim 1, wherein said ring projects beyond an outer perimeter of said mount member.
4. A laryngeal mask assembly comprising: a mask portion, the mask portion being adapted during use to locate in the hypopharynx and to open on its forward side to the patient's airway; and an elongate tube that opens at its forward, patient end into said mask portion, wherein said mask portion has a mount member attached with a patient end of said tube, the mount member being generally elliptical and having an opening on its forward surface, wherein said tube opens at a patient end of said assembly via said opening in said mount member, wherein said mask portion has an inflatable member comprising an inflatable ring and a central web extending within said ring, wherein said central web comprises two flexible walls bonded together, and wherein said web is attached to said forward surface of said mount member and has an aperture therein aligned with said opening in said mount member.
5. A method of manufacture of a laryngeal mask assembly of the kind including a mask portion and an elongate tube that opens at its forward, patient end into said mask portion, said mask portion being adapted during use to locate in the hypopharynx and to open on its forward side to the patient's airway, the method including the steps of providing a mount member at a patient end of said tube, forming an expandable member comprising an expandable ring and a web within said ring, and attaching said web to said mount member so as to secure said expandable member with said mount member.
6. A method according to Claim 5, wherein said expandable member is formed by providing an expandable balloon having two opposite walls and joining said opposite walls together in a central region such that the region where said walls are joined together provides said web and the remainder of said balloon provides said expandable ring.
7. A method according to Claim 6, wherein said opposite walls of said balloon are joined together by heat sealing.
8. A method according to Claim 6 or 7, wherein said opposite walls are joined together using a die on opposite sides of said balloon, and wherein said dies are provided with cutting formations to form an aperture in said web.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9622880 | 1996-11-02 | ||
| GBGB9622880.4A GB9622880D0 (en) | 1996-11-02 | 1996-11-02 | Laryngeal mask airways and thier manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2219860A1 true CA2219860A1 (en) | 1998-05-02 |
Family
ID=10802370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002219860A Abandoned CA2219860A1 (en) | 1996-11-02 | 1997-10-31 | Laryngeal mask airways and their manufacture |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5979445A (en) |
| EP (1) | EP0845276B1 (en) |
| JP (1) | JPH11128349A (en) |
| AU (1) | AU724830B2 (en) |
| CA (1) | CA2219860A1 (en) |
| DE (1) | DE69716012T2 (en) |
| GB (1) | GB9622880D0 (en) |
| ZA (1) | ZA979659B (en) |
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| GB9505134D0 (en) * | 1995-03-14 | 1995-05-03 | Smiths Industries Plc | Laryngeal mask airways |
| US5694929A (en) * | 1996-02-26 | 1997-12-09 | Christopher; Kent L. | Method and apparatus for ventilation/oxygenation during guided insertion of an endotracheal tube |
| US5682880A (en) * | 1996-07-26 | 1997-11-04 | Brain; Archibald Ian Jeremy | Laryngeal-mask airway with guide element, stiffener, and fiberoptic access |
-
1996
- 1996-11-02 GB GBGB9622880.4A patent/GB9622880D0/en active Pending
-
1997
- 1997-10-23 EP EP97308464A patent/EP0845276B1/en not_active Expired - Lifetime
- 1997-10-23 DE DE69716012T patent/DE69716012T2/en not_active Expired - Fee Related
- 1997-10-23 US US08/956,358 patent/US5979445A/en not_active Expired - Fee Related
- 1997-10-23 AU AU42782/97A patent/AU724830B2/en not_active Ceased
- 1997-10-28 ZA ZA9709659A patent/ZA979659B/en unknown
- 1997-10-31 JP JP9300200A patent/JPH11128349A/en active Pending
- 1997-10-31 CA CA002219860A patent/CA2219860A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| ZA979659B (en) | 1998-05-21 |
| AU724830B2 (en) | 2000-09-28 |
| EP0845276B1 (en) | 2002-10-02 |
| AU4278297A (en) | 1998-05-07 |
| JPH11128349A (en) | 1999-05-18 |
| EP0845276A3 (en) | 1998-10-28 |
| GB9622880D0 (en) | 1997-01-08 |
| EP0845276A2 (en) | 1998-06-03 |
| DE69716012D1 (en) | 2002-11-07 |
| US5979445A (en) | 1999-11-09 |
| DE69716012T2 (en) | 2003-02-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |