| 摘要 |
An in-line cannula valve assembly for controlling flow through a conduit, comprising a housing, including a collapsible housing part having a flexible wall, joined to a relatively rigid housing part. A first fluid passage in the relatively rigid housing part are provided as a portion of the conduit. A cannula element is positioned with its piercing point end in the second fluid passage, and the opposite end is positioned adjacent the first fluid passage. The cannula element is adapted for longitudinal movement through the first and second passages. A longitudinal groove is defined in the cannula element extending to the opposite end, but terminating short of the piercing point end. Sealing means are positioned about the cannula element. Thus, the cannula element may be positioned in either a first, closed position in which the longitudinal groove is spaced from the sealing means, or a second. flow-permitting position in which the groove passes through the sealing means, to permit fluid flow along the groove through the sealing means. A rupturable membrane is also provided to prevent flow through the conduit, being positioned to be ruptured by the piercing point of the cannula element by longitudinal movement thereof.
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