Phlebotomy needle system incorporating means to add anticoagulant and wash liquid

• US 3,916,892 A
• Filed: 04/29/1974
• Issued: 11/04/1975
• Est. Priority Date: 04/29/1974
• Status: Expired due to Term

• Current Assignee: Haemonetics Corporation
• Original Assignee: Allen Latham Jr
• Inventors: Latham, Allen Jr.
• Primary Examiner(s): Truluck, Dalton L.
• Application Number:
  US05/464,835
• Time in Patent Office: 554 Days
• Field of Search: 128/2B,2F,214R,214C,214.2,214.4,221,276-278,347,240-241
• US Class Current: 604/83
• CPC Class Codes: A61M 1/3646 Expelling the residual body fluid after use, e.g. back to the body
• CPC Class Codes: A61M 1/85 with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208
• CPC Class Codes: Y10S 604/903 Medical container with material agitation means

Abstract

A phlebotomy needle system providing means to introduce anticoagulant into blood immediately after it is discharged from the needle cannula into a blood transfer tube and to coat the walls of the tube with a thin film of anticoagulant up until at least that point where the anticoagulant is thoroughly mixed through the blood. Means are also provided within the same system for backflowing a wash solution into the needle.

Claims

1. In a phlebotomy needle system suitable for withdrawing blood from a donor and delivering said blood to a reservoir through a blood transfer tube, including a needle cannula and hub affixed thereto and having tubulation means for introducing an anticoagulant into said blood as it is transferred to said reservoir, the improvement comprising a socket member removably connected through a liquid-tight friction fit with said hub, said socket member comprising a central chamber into which the discharge end of said cannula extends, supporting means within said socket member by which the inlet end of said blood-transfer tube is supported in position to surround said discharge end of said cannula to define an annular passage therebetween providing communication between said central chamber and said blood transfer tube, a first auxiliary transfer tube, and means by which the discharge end of said first auxiliary transfer tube is supported in said socket member whereby said first auxiliary tube is in fluid communication with said annular passage through said central chamber.

2. a central channel opening into said central chamber having affixed therein a blood-transfer tube defining an internal passage and being of sufficient depth to permit a portion of Said shorth length of said discharge 2. of said cannula to extend into said central channel to define with said internal passage of said blood-transfer tube an annular fluid passage, and c. a first side channel having affixed therein a first auxiliary tubing in fluid communication through said central chamber with said annular fluid passage, whereby when an anticoagulant is introduced through said first auxiliary tubing it is mixed with said blood before it encounters any surface beyond said discharge end of said cannula.

3. In a phlebotomy needle system including a needle cannula suitable for withdrawing blood from a donor and having tubulation means for introducing an anticoagulant into said blood as it is transferred to a reservoir, the improvement comprising a. a tapered hub fit over the discharge end of said cannula of said needle to allow a short length of said discharge end to extend beyond said hub;

and b. a socket member affixed to said hub through a removable liquid-tight friction fit and defining therein

4. A phlebotomy needle system in accordance with claim 3 including a second side channel having affixed therein a second auxiliary tubing in fluid communication through said central chamber with said annular fluid passage, whereby when a wash solution is introduced through said second auxiliary tubing in the absence of blood and anticoagulant flow it enters the discharge end of said cannula by way of said annular passage.

5. A phlebotomy needle system particularly suited for use in a pheresis procedure, comprising in combination a. a needle comprising a cannula and a hub which includes a tapered section, and is affixed to said cannula to allow a short free length of the discharge end of said cannula to extend beyond said hub;

b. a primary tubing adapted to transfer blood and two auxiliary tubings adapted to transfer an anticoagulant and a wash solution;

c. a socket member removably engaged with said hub, having a central chamber and holding the ends of said primary and auxiliary tubings in relation to the discharge end of said cannula whereby said free length of said cannula extends through said central chamber into said primary tubing to define an annular passage providing fluid communication between said central chamber and said primary tubing and said auxiliary tubings are in fluid communication with said annular path through said central chamber.

6. A phlebotomy needle system in accordance with claim 5 wherein said socket member has seat means for positioning the ends of said tubings therein.

7. A phlebotomy needle system in accordance with claim 5 wherein said tubings are bonded to said socket member.

8. A phlebotomy needle system in accordance with claim 5 wherein said hub makes a liquid-tight, friction fit within said socket member.

9. A phlebotomy needle system in accordance with claim 5 including gripper means affixed to said hub.

10. A phlebotomy needle system in accordance with claim 5 wherein said cannula is a rigid stainless steel tubing.

11. A phlebotomy needle system in accordance with claim 5 wherein said cannula is a flexible tubing having a rigid lancet extending therethrough and beyond the inlet and outlet ends of said flexible tubing.

12. A phlebotomy needle system in accordance with claim 5 including a source of an anticoagulant connected to one of said auxiliary tubings and a saline wash solution connected to the other of said auxiliary tubings and means to control the flow of said anticoagulant and said wash solution through said tubings.

13. A phlebotomy system in accordance with claim 5 wherein said primary tubing is connected to a blood reservoir.

14. A phlebotomy system in accordance with claim 13 wherein said reservoir is a centrifuge rotor.