Laryngeal mask airway with concentric drainage of oesophagus dis

Details Laryngeal mask airway with concentric drainage of oesophagus dis Laryngeal mask airway with concentric drainage of oesophagus dis

1992-09-28

1993-09-07

Burr, Edgar S.

Surgery

Respiratory method or device

Respiratory gas supply means enters mouth or tracheotomy...

12820714, 604174, 604 96, A61M 1600

Patent

active

052419568

ABSTRACT:
A laryngeal mask airway is described which is fitted with an evacuation or drainage tube which passes through the back of the mask and terminates concentrically within an inflatable-cuff formation at the distal end of the mask. In the case of a laryngeal mask which relies on an inflatable ring to establish a seal around the laryngeal inlet, the inflatable-cuff formation results from sealed passage of the evacuation tube through the distal region of the inflatable ring, the distal end of which is centrally apertured and reentrantly folded into sealed junction with the distal end of the tube. When the mask is inflated, its distal end establishes a cuff, sealing the tube against the upper oesophageal sphincter. In the presently preferred embodiment, an auxiliary inflatable cuff is carried at the back side of the mask and, when inflated, establishes a cushioned reference between the evacuation tube and the posterior wall of the pharynx, enabling more effective sealing of the mask to the laryngeal inlet and of the drainage cuff to the oesophageal sphincter, in the circumstance of negative pressure applied to the evacuation tube.

REFERENCES:
patent: 4454887 (1984-06-01), Kruger
patent: 4497318 (1985-02-01), Donmichael
patent: 4969458 (1990-11-01), Wiktor
patent: 4981470 (1991-01-01), Bombeck, IV
patent: 4995388 (1991-02-01), Brain
patent: 5033466 (1991-07-01), Weymuller
patent: 5038766 (1991-08-01), Parker
patent: 5067497 (1991-11-01), Greear
patent: 5076268 (1991-12-01), Weber
patent: 5116305 (1992-05-01), Milder

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