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1. (WO2017032963) VALVES AND TUBES INCLUDING VALVES

Pub. No.:    WO/2017/032963    International Application No.:    PCT/GB2016/000150
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat Aug 13 01:59:59 CEST 2016
IPC: A61M 16/20
A61M 16/04
F16K 15/06
F16K 15/18
F16K 15/20
Applicants: SMITHS MEDICAL INTERNATIONAL LIMITED
Inventors: KHANOM, Rabeya
WOOSNAM, Christopher John
YOUSEFFI, Mansour
Title: VALVES AND TUBES INCLUDING VALVES
Abstract:
An inflation valve (20) for a sealing cuff (10) on a tracheal tube (1) has a helical ceramic spring (40) that urges a valve seal (45, 87) against a valve seat (28, 128). The actuator (51) by which the seal (45, 87) is lifted from the seat to open the valve includes a spring latch mechanism (53). The latch mechanism has three spring fingers (56) that are held resiliently in compression in a recess (60) before the first actuation of the valve. When first used, the actuator is moved forwardly to open the valve so that the free ends of the spring fingers clear the end of the recess and deflect outwardly. When the actuator (51) is released to allow the valve to close, the spring fingers (56) engage a latch surface (63) so that the spring (40) is held in greater tension.