Injection septum
AssigneeMerlin Instrument Company
InventorJames S. Fullemann
Life of this patent
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Abstract
A septum for an injection port of a gas chromatograph includes interlocked syringe and duckbill seals. The syringe seal prevents fluid leakage during injection by syringe. The duckbill seal prevents fluid leakage after the syringe needle is withdrawn from the septum. A spring clip is used to urge the duckbill closed as the needle is withdrawn. An advantage of this two component septum is that the duckbill slit can be precisely formed in the duckbill seal before the seals are engaged.
Claims10
A septum for permitting injection of a fluid by extension of a needle therethrough, said needle having an injection diameter, said septum comprising:
- aperture means for defining a complex aperture, said complex aperture including an annular aperture with a minimum diameter and a duckbill aperture with a duckbill perimeter, said aperture means including elastic material bounding said complex aperture, said minimum diameter being less than said injection diameter when no needle is penetrating therethrough, said minimum diameter being substantially equal to said injection diameter when said needle penetrates said annular aperture, said perimeter being at least as great as said injection diameter when said needle penetrates through said duckbill aperture, said elastic material contacting and generally conforming to the cross section of said needle at said annular aperture and said duckbill aperture when said needle extends completely through said complex aperture.
Dependencies are inferred from the claim text.