Laryngeal-mask construction
First Claim
1. A laryngeal-mask construction, comprising a backplate member providing in essentially a single plane an apertured base-mounting rim of generally elliptical configuration, an inflatable toroidal ring of flexible material surrounding and continuously connected to said base-mounting rim, and an inflatable back cushion comprising a shell of flexible material adhered generally to the perimeter of said inflatable ring to define said back cushion in conjunction with said mask construction.
2 Assignments
0 Petitions
Accused Products
Abstract
A shell of flexibly pliant material is in peripherally sealed engagement with the inflatable ring portion of a laryngeal mask such that when both the mask ring and the space within the shell are inflated, i.e., after patient installation of the mask in deflated condition, a back cushion is established with large-area self-adapting conformation to the back wall of the pharynx, so that inflation pressure in the back cushion not only positions back contours of the mask per se at offset from the back wall of the pharynx but in addition establishes a large area of uniformly distributed forward pressure on the mask per se, resulting in a pneumatically loaded application of the inflatable ring of the mask, into enhanced sealing conformance to and engagement with the laryngeal inlet.
242 Citations
15 Claims
- 1. A laryngeal-mask construction, comprising a backplate member providing in essentially a single plane an apertured base-mounting rim of generally elliptical configuration, an inflatable toroidal ring of flexible material surrounding and continuously connected to said base-mounting rim, and an inflatable back cushion comprising a shell of flexible material adhered generally to the perimeter of said inflatable ring to define said back cushion in conjunction with said mask construction.
- 7. A laryngeal-mask construction, comprising a backplate member providing in essentially a single geometric plane an apertured base mounting rim of generally elliptical configuration, said back-plate member including an airway- tube connecting formation on an inclined axis that is at an acute angle to said geometric plane, the inclined axis being in a plane which includes the major axis of the elliptical configuration and which is normal to said geometric plane, an inflatable toroidal ring of flexible material surrounding and continuously connected to said base-mounting rim, and an inflatable back cushion comprising a shell of flexible material adhered generally to the perimeter of said inflatable ring and externally sealed around said airway tube connecting formation to define said back cushion in conjunction with said mask construction.
- 13. An artificial airway device to facilitate a patient'"'"'s lung ventilation, comprising an airway tube, an evacuation tube and a laryngeal mask at one end of said tubes, said mask comprising a back-plate member providing in essentially a single geometric plane an apertured base mounting rim of generally elliptical configuration extending from a proximal end to a distal end, said back-plate member including an airway-tube connecting formation on an inclined axis that diverges proximally at an acute angle to said geometric plane, the inclined axis being in a plane which includes the major axis of the elliptical configuration and which is normal to said geometric plane, an inflatable toroidal ring of flexible material surrounding and continuously connected to said base-mounting rim, the distal end of said inflatable ring being configured for entry into and insertional location of the mask by engagement with the oesophagus at the upper sphinctral region of the oesophagus when the mask is positioned for sealing the airway tube to the laryngeal inlet, said evacuation tube including a portion having sealed passage through part of said toroidal ring and having an open distal end centrally within and axially short of the distal end of said ring, and an inflatable back cushion comprising a shell of flexible material adhered generally to the perimeter of said inflatable ring and externally sealed around said airway-tube connecting formation to define said back cushion in conjunction with said mask construction.
Specification