Anaesthetic mask

• US 4,770,169 A
• Filed: 02/13/1987
• Issued: 09/13/1988
• Est. Priority Date: 02/13/1987
• Status: Expired due to Fees

• Current Assignee: MDT Incorporated
• Original Assignee: MDT Diagnostic Company
• Inventors: Swenson, Charles B., Branagan, J. Miles, Schmoegner, John C.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Philips, Timothy G.
• Application Number:
  US07/014,394
• Time in Patent Office: 578 Days
• Field of Search: 128/203.12, 128/203.29, 128/205.25, 128/205.19, 128/204.18, 128/207.13, 128/206.28, 128/206.26, 128/206.24, 128/206.21, 128/910
• US Class Current: 128/207.13
• CPC Class Codes: A61M 16/009 Removing used or expired gases or anaesthetic vapours filtering, sterilising or disinfecting the exhaust air in drainage systems A61M1/784; bacterial filters in the expiratory path A61M16/1065
• CPC Class Codes: A61M 16/01 specially adapted for anaesthetising A61M16/104, A61M16/18 take precedence
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 16/0611 with a gusset portion
• CPC Class Codes: A61M 16/0622 having an underlying cushion
• CPC Class Codes: A61M 16/08 Bellows; Connecting tubes having means for taking samples G01N1/22; Water traps; Patient circuits
• CPC Class Codes: Y10S 128/91 Anesthesia gas scavenging system

Abstract

The present invention provides an improved anaesthetic scavenging face mask having a scavenging channel running along the perimeter of the mask. The mask is provided with an anaesthetic gas inlet and a vacuum outlet. The scavenging channel is connected to the vacuum outlet.

Claims

1. An anaesthetic mask comprising:

a wall forming a respiratory chamber having a rim sized and configured to generally conform to a selected area surrounding the nose and/or mouth of a patient, said rim having a closed-loop perimeter and a generally "Y"-shaped cross section;

an anaesthetic gas inlet mechanically associated with said respiratory chamber for connection to an anaesthetic gas supply;

an exhaust outlet mechanically associated with said respiratory chamber for connection with a vacuum supply;

a face seal connected to said rim, said seal including;

a closed-loop seal body defining a vacuum channel therein and further including a plurality of openings arranged to provide gas intercommunication between said vacuum channel and the exterior of said seal body, said seal body enclosing said rim and

vacuum connection means for providing gas intercommunication between said vacuum channel and said vacuum supply.

2. The mask of claim 1, wherein said vacuum channel is formed by an interior tubular space between said seal body and said rim when said seal body is connected to said rim.

3. The mask of claim 2, wherein said vacuum connection means is formed by said mask having a vacuum connection channel formed in the wall of said respiratory chamber and opening in the proximity of said rim and said vacuum supply.

4. The mask of claim 1, wherein said seal body includes a plurality of sealing surfaces, at least one of which is sized and adapted to seal against the face of a patient and adjacent said sealing surfaces to define a secondary vacuum channel.

5. The mask of claim 4, wherein said sealing surfaces are sized and adapted to make contact with and seal against the face of a patient.

6. The mask of claim 4, wherein at least one of said plurality of openings provides gas intercommunication between said secondary channel and said vacuum channel.

7. The mask of claim 1, wherein said seal body is formed of a flexible, rubber-like material.

8. The mask of claim 1, wherein said seal body is removable from said mask.

9. The mask of claim 1, wherein said seal body is formed of a sterilizable material.

10. The mask of claim 1, wherein said inlet and said outlet are rotatably connected to said mask.

11. The mask of claim 1, having a strap with two belts which connect to said mask, said belts having means for connecting to each other.

12. The mask of claim 11, wherein one of said belts of said strap has a slot sized to receive the other of said belts.

13. The mask of claim 11, wherein one of said belts connects to said inlet and the other of said belts connects to said outlet.

14. The mask of claim 1, wherein said respiratory chamber is formed of a transparent material.

15. An anaesthetic mask, comprising:

a wall forming a cup shaped respiratory chamber adapted to be placed on the face over the nose and/or mouth of a patient, said respiratory chamber having a closed-loop shaped rim sized and configured to generally conform to a patient'"'"'s face when said mask is placed upon the nose and/or mouth area of a patient'"'"'s face, said rim having a generally "Y"-shaped cross section;

an anaesthetic gas inlet connected to said respiratory chamber for connection to an anaesthetic gas supply and to provide gas intercommunication between said gas supply and said respiratory chamber;

a vacuum outlet connected to said respiratory chamber for connection to a vacuum supply to provide gas intercommunication between said vacuum supply and said respiratory chamber;

a closed-loop seal body formed of a flexible rubber-like material being sized and configured to generally conform to said rim of said chamber to seal against a patient'"'"'s face and having a closed-loop shaped channel which connects to said rim by means of said closed-loop shaped channel enclosing said rim, said rim air-tightly sealing said closed-loop shaped channel so that an interior tubular space between said closed-loop shaped channel and said rim forms a vacuum channel, said seal body having a plurality of openings to provide gas intercommunication between said vacuum channel and an exterior surface of said seal body; and

a tube mechanically associated with said seal body and said vacuum supply to provide gas intercommunication between said vacuum channel and said vacuum supply.

16. The mask of claim 15, wherein said seal body has two closed-loop sealing surfaces sized and configured to make contact with and seal against a patient'"'"'s face and having a secondary channel between said sealing surfaces and wherein at least one of said openings provides gas intercommunication between said secondary channel and said vacuum channel.

17. The mask of claim 15 wherein said tube is formed within the wall of said respiratory chamber and provides gas communication between said vacuum channel and said vacuum outlet.

18. The mask of claim 15, including valve means mechanically associated with said vacuum outlet to provide direct vacuum to said respiratory chamber only upon exhalation of a patient.

19. The mask of claim 18, wherein said tube is in open communication with said vacuum supply.

20. The mask of claim 15, having a strap having two belts, one of said belts being connected to said inlet and the other of said belts being connected to said outlet, said belts having means for connecting to each other.

21. The mask of claim 15, wherein said seal body may be removed from said respiratory chamber and wherein said seal body is formed of a sterilizable material.

22. The mask of claim 15, wherein said respiratory chamber is formed of a rigid transparent material.