Closed system blood sampling device

• US 5,947,932 A
• Filed: 06/30/1997
• Issued: 09/07/1999
• Est. Priority Date: 08/25/1994
• Status: Expired due to Fees

• Current Assignee: Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Browne, Glennie, Desecki, Vincent C.
• Primary Examiner(s): Coggins, Wynn Wood
• Assistant Examiner(s): KENNEDY, SHARON E
• Application Number:
  US08/886,168
• Time in Patent Office: 799 Days
• Field of Search: 604/35, 604/122, 604/125, 604/126, 604/190, 604/199, 604/256, 604/258, 604/283, 604/284, 604/405, 604/406, 604/115, 128/912
• US Class Current: 604/190
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150213 Venting means
• CPC Class Codes: A61B 5/150259 Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape
• CPC Class Codes: A61B 5/150992 Blood sampling from a fluid line external to a patient, such as a catheter line, combined with an infusion line; blood sampling from indwelling needle sets, e.g. sealable ports, luer couplings, valves tubing connectors and couplings A61M39/00
• CPC Class Codes: A61B 5/155 Devices specially adapted for continuous or multiple sampling, e.g. at predetermined intervals devices loaded with multiple lancets simultaneously A61B5/15146

Abstract

The invention comprises a closed system blood sampling device comprising a bifurcated capillary tube which has a first branch having a cannula shaped end for withdrawing and conveying blood to a communicating blood collection zone. The blood collection zone is for storing a quantity of withdrawn blood. It also feeds an initial fraction of withdrawn blood to a communicating blood disposal chamber which has an air permeable liquid sealed end. The second branch of the bifurcated capillary tube is connected to and is in fluid communication with the blood collection zone. It terminates in an opening adapted to receive a blood withdrawal device. Also disclosed is a method of sampling blood from a patient having an artery fitted with a venipuncture device which is attached to an injection site which contains the closed blood sampling device described.

Claims

1. A closed system sampling device for sampling blood through an injection site, said device comprising:

a rigid cannula member extending forward to form a forward end of said device, said cannula member being configured to have a blunt forward tip which initially contacts the injection site, said cannula member forming a bore which extends rearward from said forward tip;

a lumen formed within said device, said lumen being rearward of said cannula, said bore extending rearward from said tip and opening into said lumen;

a second branch defining a port in liquid communication with and opening into said lumen;

a disposal chamber formed within said device and connected to said lumen, said chamber, lumen and bore arranged so that blood flows rearward from said bore into said lumen and then into said chamber, said chamber having a first end;

a liquid tight member disposed at said first end of said disposal chamber, said liquid tight member being air permeable and liquid tight, one side of the liquid tight member being visible; and

an absorbent medium disposed within said disposal chamber between said liquid tight member and said lumen and opened to said lumen so that the blood flows into the absorbent medium.

2. The system of claim 1 wherein said liquid sealing member includes a thin hydrophobic membrane covering said first end.

3. The system of claim 1 wherein said absorbent medium includes a cellulosic wadding.

4. The system of claim 1 wherein said port within said second branch is sealed with a cap having a capillary luer connection fitting.

5. The system of claim 1 wherein said second branch is angled relative to said bore of said cannula.

6. The system of claim 1 wherein said bore, said lumen and said disposal chamber are generally elongated and aligned with each other.

7. The system of claim 1 wherein said bore opens into a forward end of said lumen and said disposal chamber opens into a rearward end of said lumen.

8. A closed system sampling device for sampling blood through an injection site, said device comprising:

a rigid cannula member extending forward to form a forward end of said device, said cannula member being configured to have a blunt forward tip which initially contacts the injection site, said cannula member forming a bore which extends rearward from said forward tip;

a lumen formed within said device, said lumen being rearward of said cannula, said bore extending rearward from said tip and opening into said lumen;

a second branch defining a port in liquid communication with said lumen and opening into said lumen;

a disposal chamber formed within said device and connected to said lumen, said chamber, lumen and bore arranged so that fluid flows rearward from said bore into said lumen and then into said chamber, said chamber having a first end;

a liquid tight member disposed at said first end of said disposal chamber, one side of the liquid tight member being visible; and

an adsorbent medium disposed within said disposal chamber between said liquid tight member and said lumen and opened to said lumen so that the blood flows into the absorbent medium.

9. A closed system sampling device for sampling blood through an injection site, said device comprising:

a rigid cannula member extending forward to form a forward end of said device, said cannula member being configured to have a blunt forward tip, said cannula member forming a bore which extends rearward from said forward tip;

a completely hollow lumen formed within said device, said lumen being rearward of said cannula, said bore extending rearward from said tip and opening into said lumen;

a second branch defining a port in liquid communication with said lumen and opening into said lumen;

a disposal chamber formed within said device and connected to said lumen, said chamber, lumen and bore arranged so that fluid flows rearward from said bore into said lumen and then into said chamber, said chamber having a first end;

a liquid tight member disposed at said first end of said disposal chamber; and

an absorbent medium disposed within said disposal chamber and between said lumen and said liquid tight member so that blood flows from said lumen into said absorbent medium.

10. A closed system sampling device for sampling blood through an injection site, said device comprising;

a cannula member entirely formed of a rigid material and extending forward to form a forward end of said device, said cannula member being configured to have a blunt forward tip which initially contacts a injection site, said cannula member forming a bore which extends rearward from said forward tip;

a lumen formed within said device, said lumen being rearward of said cannula, said bore extending rearward from said tip and opening into said lumen;

a second branch defining a port in liquid communication with said lumen and opening into said lumen;

a disposal chamber formed within said device and connected to said lumen, said chamber, lumen and bore arranged so that fluid flows rearward from said bore into said lumen and then into said chamber, said chamber having a first end;

an absorbent medium disposed within said disposal chamber and exposed to said lumen so as to allow for blood to flow from said lumen into said medium; and

a hydrophobic membrane disposed at said first end of said disposal chamber.

11. A closed system sampling device for sampling blood through an injection site, said device comprising:

a rigid cannula member extending forward to form a forward end of said device, said cannula member being configured to have a blunt tip, said cannula member forming a bore which extends rearward from said forward tip;

a lumen formed within said device, said lumen being rearward of said cannula;

a second branch defining a port opening into said lumen;

a disposal chamber formed within said device and connected to said lumen, said chamber having a first end, said lumen, said disposal chamber and said bore being configured so that blood flowing up said bore flows into said lumen prior to flowing into said disposal chamber;

a liquid tight member disposed at said first end of said disposal chamber; and

an absorbent medium formed of a material differing from said sealing member and disposed within said disposal chamber said absorbent medium opened to said lumen so that blood flows from said lumen into said absorbent medium.

12. A method for penetrating an injection site and sampling blood with a blood sampling device comprising:

penetrating the injection site with a rigid cannula member extending forward to form a forward end of said device, said cannula member being configured to have a blunt tip, said cannula member forming a bore which extends rearward from said forward tip, said device forming, a lumen rearward of said cannula, a second branch defining a port in liquid communication with said lumen, and a disposal chamber connected to said lumen, said chamber having a first end, said lumen, said disposal chamber and said bore being configured so that blood flowing up said bore flows into said lumen prior to flowing into said disposal chamber, said device also including a liquid tight member disposed at said first end of said disposal chamber and an absorbent medium disposed within said disposal chamber;

flowing initial blood up the bore through the lumen and to the chamber and absorbing the blood into an absorbent material disposed within the chamber;

visually confirming that the lumen is filled with blood; and

after visual confirmation, removing blood from within the lumen through the port for sampling.