| 摘要 |
A vent cannula includes a tubular base having a primary longitudinal passage therein with a primary distal tip for insertion into a body vessel. The base has a tubular junction interconnected and extending at an acute angle having a secondary passage therein communicating with the primary passage. A flexible tube is slidably retained within the secondary passage. The flexible tube has a flexible distal portion with a flexible distal tip thereon, a flexible proximal portion with a side port therein and with a proximal handle. The flexible tube is initially positioned at a "first position" wherein the flexible distal tip is within the secondary passage; and is slideable to a "second position" wherein the side port of the flexible proximal portion is at the junction of the primary and secondary passages, and the flexible distal tip is inserted into the primary passage and extended from the primary distal tip to thereby extend the functional tip of the cannula. In a first embodiment, the proximal portion of the flexible tube is sealed within the base by a flexible sleeve; and in a second embodiment, the flexible tube is sealed with elastomeric washers retained between the base and an end cap.
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