| 摘要 |
<p>A laryngeal mask airway is described which is fitted with an evacuation or drainage tube (23) which passes through the back of the mask (10) and terminates concentrically within an inflatable-cuff formation (18') at the distal end (20) of the mask (10). In the case of a laryngeal mask which relies on an inflatable ring (18) to establish a seal around the laryngeal inlet, the inflatable-cuff (18') formation results from sealed passage of the evacuation tube (23) through the distal region of the inflatable ring (18), the distal end (20) of which is centrally apertured and re-entrantly folded into sealed junction with the distal end (20) of the tube (23). When the mask (10) 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 (50) is carried at the back side of the mask end (10), when inflated, establishes a cushioned reference between the evacuation tube (23) and the posterior wall of the pharynx, enabling more effective sealing of the mask (10) to the laryngeal inlet and of the drainage cuff to the oesophageal sphincter, in the circumstance of negative pressure applied to the evacuation tube (23).</p> |
