Pre-slit injection site and tapered cannula

• US 6,447,498 B1
• Filed: 10/29/1998
• Issued: 09/10/2002
• Est. Priority Date: 01/25/1988
• Status: Expired due to Fees

• Current Assignee: Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Jepson, Steven C., Dudar, Thomas E., Zdeb, Brian D., Desecki, Vince C.
• Primary Examiner(s): REIP, DAVID OWEN
• Application Number:
  US09/182,571
• Time in Patent Office: 1,412 Days
• Field of Search: 604/272, 604/273, 604/280, 604/283, 604/284, 604/411-415, 604/264, 604/239, 604/240, 604/274
• US Class Current: 604/411
• 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 blunt cannula comprising:

an elongated cylindrical portion, the cylindrical portion defining an interior channel;

a solid end region located at an end of the interior channel; and

at least one opening located along a radius of the cylindrical portion in juxtaposition to the solid end and allowing fluid to flow through said channel out the opening.

2. The blunt cannula of claim 1 wherein the opening has a rectangular cross sectional shape.

3. The blunt cannula of claim 1 wherein the solid end region has a radiused tip portion.

4. The blunt cannula of claim 1 including a plurality of openings.

5. The blunt cannula of claim 4 wherein the cross sectional flow area provided by the plurality of openings is equal to at least three times the cross sectional flow area of the channel.

6. The blunt cannula of claim 1 wherein the solid end region does not have a cross sectional cylindrical shape.

7. The blunt cannula of claim 1 including at a second end thereof an enlarged proximal region.

8. A blunt cannula comprising:

an elongated cylindrical member that defines an interior channel;

a solid end region located at a first end of the blunt cannula, the interior channel extending from a second end of the cannula and terminating at the solid end region; and

a plurality of slots located along a tapered end of the cylindrical member that allow fluid that flows through the channel to flow out of the elongated cylinder.

9. The blunt cannula of claim 8 wherein the slots have an elongated rectangular cross sectional shape.

10. The blunt cannula of claim 8 wherein the solid end region has a radiused tip portion.

11. The blunt cannula of claim 8 wherein the cross sectional flow area provided by the slots is equal to at least three times the cross sectional flow area of the interior channel.

12. The cannula of claim 8 wherein a portion of each of the slots is circumscribed by the end region.

13. The blunt cannula of claim 8 wherein the solid end region does not have a cross sectional cylindrical shape.

14. The blunt cannula of claim 8 wherein the second end has an enlarged proximal region.

15. A blunt cannula comprising:

an elongated cylindrical portion, the cylindrical portion defining an interior channel;

a solid end region located at an end of the interior channel; and

at least one opening located along the cylindrical portion in juxtaposition to the solid end so that a portion of the opening is circumscribed by the solid end region and so positioned and arranged to allow fluid to flow through said channel out the opening.

16. The blunt cannula of claim 15 wherein the opening has a rectangular cross sectional shape.

17. The blunt cannula of claim 15 including a tapered end portion extending to the solid end region.

18. The blunt cannula of claim 17 wherein the opening is located entirely along the tapered end portion.

19. The blunt cannula of claim 15 including a plurality of openings.

20. The blunt cannula of claim 19 wherein the cross sectional flow area provided by the plurality of openings is equal to at least three times the cross sectional flow area of the channel.

21. The blunt cannula of claim 15 wherein the solid end region does not have a cross sectional cylindrical shape.

22. The blunt cannula of claim 15 including at a second end thereof an enlarged proximal region.

23. A blunt cannula comprising:

an elongated cylindrical portion, the cylindrical portion defining an interior channel;

a solid end region located at an end of the interior channel;

a tapered end extending from the cylindrical portion to the solid end region; and

at least one opening located along the tapered portion in juxtaposition to the solid end so that a portion of the opening is circumscribed by the solid end region and so positioned and arranged to allow fluid to flow through said channel out the opening.

24. The blunt cannula of claim 23 wherein the opening has a rectangular cross sectional shape.

25. The blunt cannula of claim 23 including a plurality of openings.

26. The blunt cannula of claim 25 wherein the cross sectional flow area provided by the plurality of openings is equal to at least three times the cross sectional flow area of the channel.

27. The blunt cannula of claim 23 wherein the solid end region does not have a cross sectional cylindrical shape.

28. The blunt cannula of claim 23 including at a second end thereof an enlarged proximal region.