Syringe needle thimble cap and method of use thereof

• US 5,554,127 A
• Filed: 10/11/1994
• Issued: 09/10/1996
• Est. Priority Date: 10/11/1994
• Status: Expired due to Term

• Current Assignee: Sherwood Services AG
• Original Assignee: Sherwood Medical Company (Medtronic Plc)
• Inventors: Stenslokken, Douglas L., Weilbacher, Eugene E., Crouther, Ronald
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US08/321,000
• Time in Patent Office: 700 Days
• Field of Search: 604/192, 604/187, 604/198, 604/263, 604/199, 604/122, 206/365, 206/366
• US Class Current: 604/192
• CPC Class Codes: A61M 2005/3109 Caps sealing the needle bore by use of, e.g. air-hardening adhesive, elastomer or epoxy resin
• CPC Class Codes: A61M 5/3213 Caps placed axially onto the needle, e.g. equipped with finger protection guards axially-extensible protective sleeves A61M5/3243

Abstract

A syringe needle thimble cap and its method of use is shown such that the thimble cap has a porous plastic, hydrophilic core captured within a cylindrical cap member for use with an arterial blood gas syringe barrel and needle assembly. The syringe needle thimble cap has a generally thimble-shaped cap with a proximal opening. The porous plastic core material is positioned within the thimble cap distally to the proximal opening, and the core material is held in place by an inwardly extending ring to prevent its removal. An open or hollow space is created distally to the porous material which is otherwise bounded by the interior surfaces of the thimble cap.

Claims

1. A syringe needle thimble cap for purging air from a hypodermic needle and syringe comprising:

a cylindrical member having a closed end and an open end;

an absorbent core material affixed within said cylindrical member, the core filling only a portion of said tubular member such that an open space exists between the core and the closed end, the core being pierceable by the hypodermic needle to allow for the purging of air from the needle and syringe, the core material being hydrophilic such that it absorbs any liquid ejected from the hypodermic needle and syringe while allowing air to escape from the open space within the tubular member to the outside atmosphere.

2. A syringe needle thimble cap of claim 1, wherein the hydrophilic core is manufactured out of a porous plastic material which allows for the passage of air but not liquid.

3. A syringe needle thimble cap of claim 1, wherein the hydrophilic core is manufactured from a porous plastic material which allows for the passage of air while absorbing any liquid.

4. A syringe needle thimble cap of claim 1, wherein the cylindrical member is provided with a smooth cylindrical outside surface.

5. A syringe needle thimble cap of claim 1, wherein the cylindrical member has an exterior surface provided with a plurality of flats to prevent the cap from rolling when placed on its side.

6. A syringe needle thimble cap of claim 1, wherein said cylindrical member is made from a visually clear material to allow an intended user to observe when all of the air has been purged from the hypodermic needle and syringe.

7. A syringe needle thimble cap of claim 1, wherein the cylindrical member has an inwardly radially extending ring such that said absorbent core material is inserted within said cylindrical member so that said ring compresses against said core material to affix said core material in position within the cylindrical member.

8. A syringe needle thimble cap of claim 1, wherein the open end of said cylindrical member has an inwardly radially extending rim partially closing such open end.

9. A syringe needle thimble cap of claim 1, wherein the closed end of the cylindrical member has a relatively flat outer surface to allow said thimble cap to be easily placed on a flat surface with said open end facing in an upwardly direction.

10. A method for quickly purging air from a hypodermic syringe and needle assembly containing a blood sample, comprising the steps of:

providing a hypodermic syringe and needle assembly containing a blood sample, the hypodermic syringe having a barrel and plunger;

inserting the needle end of the hypodermic syringe and needle assembly into a syringe needle thimble cap having a tubular member with a closed end and an open end, the thimble cap being provided with an absorbent core material affixed within the tubular member adjacent its open end such that an open space exists within the tubular member between the core material and the closed end of the tubular member, the core material being pierceable by the tip of the hypodermic needle;

inverting the syringe barrel and needle assembly with thimble cap impaled thereon such that the needle assembly is pointing in an upwardly direction;

advancing the plunger within the syringe to expel any air and excess blood within the syringe barrel and needle assembly into the thimble cap;

removing the needle assembly with thimble cap impaled thereon from the syringe barrel; and

disposing of the needle assembly and thimble cap into a protective container.

11. The method of claim 10, wherein the inserting step includes the step of inserting the tip of the needle through the core material so that the tip of said needle extends into the interior open space within the thimble cap.

12. The method of claim 11, wherein the blood sample is an arterial blood gas sample.

13. The method of claim 10, wherein the advancing step includes the step of advancing the plunger within the syringe to expel air and blood from within the syringe barrel and needle assembly until observing a visual indication of blood being absorbed by the absorbent core material of the thimble cap.

14. A method for quickly purging air from a hypodermic syringe and needle assembly containing an arterial blood gas sample taken from a human patient by a medical technician, the syringe having a barrel and plunger, the needle assembly having a sharp needle tip, comprising the steps of:

inserting the needle tip of the hypodermic syringe and needle assembly into an artery of a human patient and obtaining an arterial blood gas sample;

removing the syringe and needle assembly from the injection site by the medical technician with one hand while depressing the injection site with the fingers of the other hand;

inserting the needle end of the syringe and needle assembly into a syringe needle thimble cap by the use of one hand of the medical technician while continuing to depress the injection site with the other hand, the thimble cap having a tubular member with a closed end and an open end, the thimble cap being provided with an absorbent core material affixed within the tubular member adjacent its open end such that a hollow space exists within the tubular member between the core material and closed end of the tubular member, the core material being pierceable by the hypodermic needle;

inverting the syringe barrel and needle assembly with thimble cap impaled thereon so that the thimble cap is above the syringe barrel by the use of one hand of the medical technician while continuing to depress the injection site with the technician'"'"'s other hand;

advancing the plunger within the syringe to expel any air and excess blood from within the syringe barrel and needle assembly into the hollow space of the thimble cap by the use of one hand of the medical technician while continuing to depress the injection site with the technician'"'"'s other hand;

setting the syringe barrel and needle assembly aside while cleaning and bandaging the injection site;

removing the needle assembly with thimble cap impaled thereon from the syringe barrel and disposing of the needle assembly and thimble cap into a protective container; and

transporting the blood filled syringe barrel to the lab for proper analysis of the patient'"'"'s blood gas levels.

15. The method of claim 14, wherein the inserting step includes the step of the core material being pierceable by the hypodermic needle so that the tip of said needle extends into the hollow space within the thimble cap.

16. The method of claim 14, wherein the step of removing the needle assembly with thimble cap impaled thereon from the syringe barrel is performed immediately before the step of setting the syringe barrel and needle assembly aside while cleaning and bandaging the injection site.

17. The method of claim 14, wherein the advancing step includes the step of advancing the plunger within the barrel to expel air and blood from within the syringe barrel and needle assembly until observing a visual indication of blood being absorbed into the core material of the thimble cap.

18. A method for quickly purging air from a hypodermic syringe and needle assembly containing an arterial blood gas sample by a medical technician using only one hand, the syringe having a barrel and plunger, the needle assembly having a sharp needle tip, comprising the steps of:

providing a syringe containing an arterial blood gas sample;

inserting the needle end of the hypodermic syringe and needle assembly into a syringe needle thimble cap having a tubular member having a closed end and an open end, the thimble cap being provided with an absorbent core material affixed within the tubular member adjacent its open end such that an open space exists within the tubular member between the core material and the closed end thereof, the thimble cap resting on an adjoining surface with its open end facing upwards, the core material being pierceable by the needle so that the needle tip extends into the open interior space within the thimble cap;

inverting the syringe barrel and needle assembly with the thimble cap impaled thereon such that the needle assembly is pointing in an upwardly direction; and

advancing the plunger within the syringe to expel any air and excess blood within the syringe barrel and needle assembly into the thimble cap.

19. The method of claim 18, wherein the advancing step includes the step of advancing the plunger within the syringe barrel to expel any air and blood from within the syringe barrel and needle assembly until observing a visual indication of blood being absorbed into the core material of the thimble cap.