Multiple re-entry implantable septum and method of using same

• US 4,634,424 A
• Filed: 04/23/1984
• Issued: 01/06/1987
• Est. Priority Date: 04/23/1984
• Status: Expired due to Fees

• Current Assignee: Windsor Medical Incorporated
• Original Assignee: Windsor Medical Incorporated
• Inventors: O'Boyle, Matthew
• Primary Examiner(s): Yasko, John D.
• Application Number:
  US06/603,149
• Time in Patent Office: 988 Days
• Field of Search: 604/8-10, 604/49, 604/29, 604/175, 604/891, 604/415, 604/896, 604/86, 128/1 R
• US Class Current: 604/506
• CPC Class Codes: A61M 39/0208 Subcutaneous access sites for injecting or removing fluids transcutaneous access sites A61M39/0247; implantable infusion devices A61M5/14276

Abstract

An improved multiple re-entry implantable septum is disclosed. The septum comprises a casing and a resilient member positioned within the casing. The resilient member has a perforation therein which is compressed closed. An outer side of the casing presents a relatively large surface configured to channel the end of a slender, elongate component such as a needle to a predetermined location at a relatively small bore in the outer side of the casing. The small bore in the casing is located adjacent the perforation in the resilient member. An assembly of a first needle and a cannula positioned over the needle is inserted into the skin so that the end of the needle contacts the relatively large surface of the casing and is channeled to the small bore therein. The bore is dimensioned to prevent passage of the first needle through the casing. The first needle is withdrawn from the casing and skin leaving the plastic cannula in place adjacent the small bore. A second, relatively smaller blunt needle is inserted into the cannula and through the small bore of the casing and the perforation in the resilient member to permit filling an implanted drug reservoir for an implanted infusion device.

Claims

1. A method of making multiple re-entries in a septum implanted under the skin, the septum having a resilient member, support means for supporting the resilient member, the resilient member having a perforation therein which is compressed closed, and a protective shroud over a side of the resilient member, the protective shroud having a relatively large surface configured to channel the end of a slender, elongate component such as a needle to a predetermined location at a relatively small bore in the protective shroud which is located adjacent the perforation in the resilient member, comprising the steps of providing an assembly of a first needle and a cannula positioned over the first needle, penetrating the skin with said first needle and cannula thereon and contacting the the protective shroud with the end of said needle so as to channel the same to the small bore in the protective shroud, the small bore being dimensioned to prevent passage of the first needle through said shroud, withdrawing said first needle from the protective shroud and skin while leaving said cannula in place adjacent the small bore in said protective shroud, and inserting a second, relatively smaller needle into said cannula and through said small bore and the perforation in said resilient member.

2. A method according to claim 1, wherein said first needle is a 24 gauge needle and said second needle is a 27 gauge blunt cannula attached to a syringe.

4. A method according to claim 1, wherein said cannula is formed of Teflon.

3. A method according to claim , wherein said support means is connected to an implanted drug reservoir, and wherein said reservoir is filled with the drug from a syringe via said second needle.