Pre-slit injection site and tapered cannula

• US 6,605,076 B1
• Filed: 08/09/1996
• Issued: 08/12/2003
• Est. Priority Date: 01/25/1988
• Status: Expired due to Fees

• Current Assignee: Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Zdeb, Brian D., Desecki, Vince C., Jepson, Steven C., Dudar, Thomas E.
• Primary Examiner(s): MENDEZ, MANUEL A
• Assistant Examiner(s): Lewis, William W.
• Application Number:
  US08/699,083
• Time in Patent Office: 2,559 Days
• Field of Search: 604/167.02, 604/167.04, 604/167.06, 604/164.06, 604/164.1, 604/165.02
• US Class Current: 604/539
• CPC Class Codes: A61J 1/10 Bag-type containers
• CPC Class Codes: A61J 1/1406 Septums, pierceable membranes
• CPC Class Codes: A61J 1/1475 Inlet or outlet ports
• CPC Class Codes: A61J 1/201 having one piercing end
• CPC Class Codes: A61J 1/2037 having valve means
• CPC Class Codes: A61J 1/2044 having slits
• CPC Class Codes: A61J 1/2055 having gripping means
• CPC Class Codes: A61J 1/2089 Containers or vials which are to be joined to each other in order to mix their contents combinations of vial and syringe for mixing their contents A61J1/2096
• CPC Class Codes: A61J 1/2096 Combination of a vial and a syringe for transferring or mixing their contents
• CPC Class Codes: A61J 2200/10 Coring prevention means, e.g. for plug or septum piecing members
• CPC Class Codes: A61M 2039/1033 Swivel nut connectors, e.g. threaded connectors, bayonet-connectors
• CPC Class Codes: A61M 2039/1072 with a septum present in the connector
• CPC Class Codes: A61M 2039/1077 Adapters, e.g. couplings adapting a connector to one or several other connectors
• CPC Class Codes: A61M 2205/195 by the needle tip shape
• CPC Class Codes: A61M 2205/197 by the seal material
• CPC Class Codes: A61M 39/045 pre-slit to be pierced by blunt instrument
• CPC Class Codes: A61M 39/1011 Locking means for securing connection; Additional tamper safeties A61M39/16 takes precedence
• CPC Class Codes: A61M 39/14 for connecting tubes having sealed ends needle sets A61M5/162; having valves closing automatically on disconnection of line A61M39/26
• CPC Class Codes: A61M 5/162 Needle sets, i.e. connections by puncture between reservoir and tube ; Connections between reservoir and tube in jet-action syringes A61M5/30; connectors for tubes having sealed ends and a needle for piercing them A61M39/14

Abstract

A pre-slit injection site includes a housing with a flow path therethrough. A first end of the housing carries a pre-slit septum. One form of a blunt cannula, usable with the injection site, carries a locking member. When the pre-slit injection site slidably receives the blunt cannula, the locking member latches to the injection site and creates a mechanically coupled unit. Another form of the cannula includes a tube having a tapered distal end region and having elongate discharge slots for reducing contact surface area and for directing the flow laterally out of the cannula. The cannula may also include a rounded lead post, an annular barb, and axially oriented grooves.

Claims

1. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:

a tube having a central bore that extends throughout said tube for an entire length of said tube and terminates at an aperture that has substantially the same cross-sectional circumference as at least portions of the central bore, the central bore defining a fluid flow path therein, said tube having a distal end region for penetrating said resealable injection site;

said distal end region defining the aperture in the distal end of said distal end region through which fluid can flow to or from said fluid flow path; and

said distal end region including a tapered exterior surface to facilitate insertion, said tube also including a generally cylindrical region extending from said tapered distal end region for entering into said resealable injection site behind said distal end region and reducing kick back during insertion, said distal end being so constructed and arranged to allow multiple insertions into said resealable injection site and allowing the injection site to reseal after each such insertion.

2. An insertion member as in claim 1 in which said exterior surface is tapered between 1 and 15 degrees.

3. An insertion member as in claim 1 in which said tapered distal end region has a length of no more than about one-half the length of said generally cylindrical region.

4. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:

locking means for removably locking said insertion member to said injection site;

a tube having a central bore through said tube, defining a fluid flow path therein, said tube having a distal end region for penetrating said resealable injection site;

said distal end region defining at least one aperture in the distal end of said distal end region through which fluid can flow to or from said fluid flow path; and

said distal end region including a tapered exterior surface to facilitate insertion, said tube also including a generally cylindrical region extending from said tapered distal end region for entering into said resealable injection site behind said distal end region and reducing kick-back during insertion, said distal end being so constructed and arranged to allow multiple insertions into said resealable injection site and allowing the injection site to reseal after each such insertion.

5. An insertion member as in claim 4 in which said locking means includes an elongate, deflectable arm that is engageable with said injection site.

6. A cannula and injection site in combination comprising:

a resealable injection site having a housing defining fluid flow path therein and having a pre-slit sealing means for sealing said housing;

a blunt cannula having a tube with a central bore that extends throughout said tube and terminates at an aperture, the central bore defining a fluid flow path therein, said tube extending through said sealing means to establish a sealed fluid flow connection with said injection site, said tube having a distal end region extending beyond said injection site with a tapered surface and a blunt radiused tip that circumscribes the aperture;

said tube having a generally cylindrical region merging with said tapered distal end region, said cylindrical region being received within said sealing means to provide reduced kick back and increased tug resistance; and

said sealing means sealing the injection site upon removal of the cannula from the sealing means.

7. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:

a tube having a central bore throughout said tube, defining a fluid flow path therein, said tube having a distal end region for penetrating said injection site;

said distal end region defining at least one aperture in the distal end of said distal end region through which fluid can flow to or from said fluid flow path;

said distal end region including a tapered exterior surface to facilitate insertion;

said distal end further including a radiused tip adjacent said tapered surface, said radiused tip circumscribing and defining, at least in part, the at least one aperture, the radiused tip reducing the insertion force into and assisting in locating the slit of said injection site, upon contacting the injection site with said cannula;

and said distal end including means for allowing said resealable injection site to reseal upon removal of the distal end from the injection site.

8. A cannula insertion member as in claim 7 including an insertion easing lubricant.

9. A cannula insertion member as in claim 7 with said tube formed of a plastic containing silicone.

10. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:

a tube having a central bore throughout said tube defining a fluid flow path therein, said tube having a distal end region terminating in an aperture and including a blunt radiused tip for penetrating said injection site;

said-distal end region including a tapered surface; and

said tube also including a generally cylindrical region extending from said distal end region for entering into said injection site behind said distal end region, said distal end and cylindrical region cooperating with the resealable injection site to maintain a seal after removal of the cannula from the site.

11. A cannula and injection site in combination comprising:

an injection site having a housing defining a fluid flow path therein and having a pre-slit resealable sealing means for sealing said housing;

a blunt cannula having a tube with a central bore throughout said tube, defining a fluid flow path therein, said tube extending through said sealing means to establish a sealed fluid flow connection with said sealing means to establish a sealed fluid flow connection with said injection site, said tube having a distal end region extending beyond said injection site and having a tapered surface on said distal end region, said distal region defining, at an extreme distal end thereof, an aperture;

said tube having a generally cylindrical region merging with said tapered distal end region, said cylindrical region being received within said sealing means; and

the sealing means and cannula cooperating to allow the sealing means to seal the injection site upon removal of the cannula from the injection site.