Self sealing subcutaneous infusion and withdrawal device
First Claim
1. A self-sealing subcutaneous infusion and withdrawal device comprising, a cup-shaped needle stop member having a wall portion defining a mouth, and a base opposite said mouth, a fluid transfer opening formed in said wall portion, a jacket member enveloping said needle stop member, said jacket member including a fluid transfer tube aligned with the fluid transfer opening of said needle stop member, a needle penetrable seal member for sealing the mouth of said needle stop member, said seal member having opposite convex surfaces, one of said convex surfaces extending into said needle stop member and the other of said convex surfaces extending away from said needle stop member, said other surface having a peripheral ledge, and clamping means for clamping said peripheral ledge of said seal member to the mouth of said needle stop member.
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Accused Products
Abstract
The self-sealing subcutaneous infusion and withdrawal device or septum includes a cup-shaped needle stop member that defines a fluid chamber having a fluid transfer opening. A jacket envelops the needle stop member and includes an integrally formed delivery tube that aligns with the fluid transfer opening in the needle stop member. The fluid chamber of the needle stop member is sealed by a needle penetrable sealing member that is forced against a wall of the needle stop member by a clamping member to provide a mechanical leak-tight seal. The seal member has opposite convex surfaces which cooperate with the clamping member to impose a compression force upon a needle that penetrates the seal member during the fluid infusion and fluid withdrawal processes.
231 Citations
18 Claims
- 1. A self-sealing subcutaneous infusion and withdrawal device comprising, a cup-shaped needle stop member having a wall portion defining a mouth, and a base opposite said mouth, a fluid transfer opening formed in said wall portion, a jacket member enveloping said needle stop member, said jacket member including a fluid transfer tube aligned with the fluid transfer opening of said needle stop member, a needle penetrable seal member for sealing the mouth of said needle stop member, said seal member having opposite convex surfaces, one of said convex surfaces extending into said needle stop member and the other of said convex surfaces extending away from said needle stop member, said other surface having a peripheral ledge, and clamping means for clamping said peripheral ledge of said seal member to the mouth of said needle stop member.
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6. A self-sealing subcutaneous infusion and withdrawal device comprising:
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(a) a cup-shaped needle stop member defining a fluid chamber with a fluid transfer opening, said needle stop member including a mouth portion; (b) jacket means enveloping said needle stop member; and (c) needle penetrable sealing means for sealing said fluid chamber such that said fluid chamber may be accessed by a needle penetrating said sealing means, said sealing means including a seal member having two opposing convex surfaces, one of said surfaces extending outside said fluid chamber and having a peripheral ledge, said other convex surface extending inside said fluid chamber, said sealing means further including a clamping member for clamping said peripheral ledge of said seal member against said needle stop member to seal said fluid chamber. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of making a self-sealing subcutaneous infusion and withdrawal device:
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(a) forming a needle stop member in the general shape of a cup with a mouth portion and a wall portion, and providing a fluid transfer opening in the wall of the needle stop member, (b) providing a flexible jacket around the needle stop member with a fluid transfer tube that aligns with the fluid transfer opening in the needle stop member, (c) forming a seal member with two opposing convex surfaces, one of the convex surfaces having a peripheral ledge, (d) sealing the mouth of the needle stop with said seal member with the convex surface having a peripheral ledge extending outside the needle stop member, and the other convex surface extending inside the needle stop member, (e) clamping said peripheral ledge to the mouth of the needle stop member so as to provide a leak-tight seal between the seal member and the needle stop member and a compression load on the seal member that enhances the sealing capability of the seal member around an injection needle.
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Specification