Blunt cannula and filter assembly and method of use with point-of-care testing cartridge

• US 6,869,405 B2
• Filed: 03/27/2002
• Issued: 03/22/2005
• Est. Priority Date: 03/30/2001
• Status: Expired due to Term

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Marsden, Stewart
• Primary Examiner(s): Hindenburg, Max F.
• Assistant Examiner(s): SZMAL, BRIAN SCOTT
• Application Number:
  US10/109,300
• Publication Number:
  US 20020143298A1
• Time in Patent Office: 1,091 Days
• Field of Search: 600/573, 600/576, 600/577, 600/578, 210/645, 422/61, 422/68.1, 422 99-102, 206/305, 206/569, 604/264, 604/266, 604/272, 604/523
• US Class Current: 600/573
• CPC Class Codes: G01N 1/14 Suction devices, e.g. pumps; Ejector devices
• CPC Class Codes: G01N 1/405 by adsorption or absorption

Abstract

A kit includes a point-of-care testing cartridge and a blunt cannula assembly. The blunt cannula assembly includes a blunt cannula that has a filter therein for filtering cellular components from whole blood and enabling plasma to be delivered by the blunt cannula to the testing cartridge.

Claims

1. A blunt cannula assembly comprising a cannula having a proximal end, a distal end and a lumen extending between said ends, said blunt cannula defining an annular step in the lumen and facing towards said proximal end, portions of said lumen adjacent said proximal end defining a tapered opening dimensioned and configured for fluid-tight mating with a Luer tip, a filter mounted in said lumen between said step and said tapered opening so that said Luer tip inserted into said tapered opening is opposed to said filter, portions of said blunt cannula adjacent said distal end having a pair of converging diametrically opposite triangular projections meeting at a well defined tip, said triangular projections being separated from one another by oppositely facing ports.

2. The blunt cannula of claim 1, wherein said filter comprises a dual filter having first and second filter layers adjacent to one another.

3. The blunt cannula of claim 2, wherein said filter layers are connected to one another.

4. The blunt cannula of claim 1, wherein said filter has a pore size between 0.2-5.0 microns.

5. The blunt cannula of claim 1, wherein said filter is selected from the group consisting of glass fibers, glass wool, nylon and ceramic fibers.

6. The blunt cannula of claim 1, wherein said proximal end of said blunt cannula comprises a pair of diametrically opposite lugs configured for mating with a Luer collar.

7. The blunt cannula of claim 1, wherein said filter comprises an anticoagulant for preventing clotting of a selected fluid material that passes through said filter.