| 摘要 |
<p>A ventilation cap (10) for a flashback chamber is formed of a hollow elongate cylindrical body (24) of polymeric material and includes a proximal opening (25) which is blocked by a venting material (27) such as a hydrophobic filter, and a distal opening (28) which is sized to allow an extension (21) of the flashback chamber to be inserted therein for airtight connection therewith. The elongate body of the ventilation cap has a tear strip (31) formed therein by a pair of generally parallel score lines (30). The cap is affixed to the flashback chamber so as to allow air to pass from the flashback chamber through the vent as blood fills the flashback chamber, while preventing blood from passing through the vent. When it is desired to attach other apparatus to the extension of the flashback chamber, the tear strip, which may have a pull tab (29) integrally formed therewith, is torn away from the elongate body to destroy the airtight seal between the flashback extension and the cap. Once the tear strip has been pulled away from the body of the cap, the cap can be easily removed from the extension without the creation of vacuum forces which would tend to cause spillage of blood from the flashback chamber.</p> |
