Needle assembly for introducing a carrier gas into a sample vessel
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United States of America Patent
Stats
-
Dec 17, 1985
Grant Date -
N/A
app pub date -
Nov 21, 1983
filing date -
Jan 22, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A needle is movable by a servomotor between a position of rest and an operating position in a stationary housing. The needle includes a tip and a first lateral opening close to the tip and a second lateral opening spaced therefrom. A longitudinal passage of the housing through which the needle is guided includes a pair of seals at the lower end and a seal at the upper end. A carrier gas conduit ends in the longitudinal passage axially inwards of the seals. A port communicating with atmosphere ends axially inwards of the upper seal. The arrangement permits a sample extraction from sample vessels closed by a membrane without the sample vessels having to be lifted and pressed against the needle.
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