Cannula for a slit septum and a lock arrangement therefore
First Claim
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1. The combination ofa septum of elastomeric material having a slit therein and being of a thickness of from 0.074 inches to 0.160 inches;
- anda hollow needle for penetrating said septum through said slit, said needle having an outside diameter in a range of from 0.032 inches to 0.058 inches and a closed distal end with a smooth surface for penetrating into said septum without removing debris from said septum, said needle having at least one opening in a sidewall thereof for the passage of fluid into or from within said needle.
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Abstract
A smooth tipped hollow needle is provided for piercing a slit septum of a medical connector or the like. The smooth tipped needle may be of closed end type or of open end type. Due to the smooth septum-penetrating surfaces, the needle minimizes the risk of debris being scrapped or abraded from the internal wall of the septum during penetration. An internal locking mechanism is also provided for locking a needle within a connector after passage through a septum. The locking mechanism employs a washer with protuberances to mate within dimples on the needle.
227 Citations
18 Claims
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1. The combination of
a septum of elastomeric material having a slit therein and being of a thickness of from 0.074 inches to 0.160 inches; - and
a hollow needle for penetrating said septum through said slit, said needle having an outside diameter in a range of from 0.032 inches to 0.058 inches and a closed distal end with a smooth surface for penetrating into said septum without removing debris from said septum, said needle having at least one opening in a sidewall thereof for the passage of fluid into or from within said needle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. The combination of
a tubular member for conducting fluid therethrough; -
an elastomeric septum secured to one end of said tubular member to seal said end to the passage of fluid; a hollow needle for penetrating said septum to communicate with the interior of said tubular member; and means in said tubular member for releasably locking said needle in said tubular member after penetration through said septum to prevent accidental withdrawal of said needle from said tubular member. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. The combination of
a tubular member for conducting fluid therethrough; -
an elastomeric septum secured to one end of said tubular member to seal said end to the passage of fluid, said septum having a slit therein and being of a predetermined thickness; a hollow needle for penetrating said slit and said septum, said needle having an outside diameter of a size less than said thickness of said septum and having one of a closed distal end with a smooth surface and an open distal end having a peripheral wall terminating in a smooth rounded surface for penetrating into said slit without removing debris from said septum; and means in for releasably locking said needle in said tubular member after penetration through said septum. - View Dependent Claims (17, 18)
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Specification