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Needle guard

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Publication number
US3658061A
US3658061A US3658061DA US3658061A US 3658061 A US3658061 A US 3658061A US 3658061D A US3658061D A US 3658061DA US 3658061 A US3658061 A US 3658061A
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Prior art keywords
needle
guard
catheter
hub
flexible
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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John P Hall
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Baxter International Inc
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Baxter International Inc
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321Means for protection against accidental injuries by used needles
    • A61M5/3216Caps placed transversally onto the needle, e.g. pivotally attached to the needle base

Abstract

A catheter needle guard unit having a hub with a cannula needle affixed therein to form a passageway through the hub and cannula, said needle being pointed at the distal end, and a needle guard means having a sleeve member with a longitudinal slot adapted to snap over the entire length of the needle in snug relationship therewith to form a protective closure over the point of the needle when in the closed position and swingably fastened to the hub through an intermediate flexible connecting section.

Description

United States Patent Hall 5] .Apr. 25, 1972 541 NEEDLE GUARD 3,323,523 6/1967 Scislowicz et al ..l28/2l4.4 3,324,853 6/1967 Czorny et al ..l28/2l4.4 [72] Inventor: John P. Hall, Chicago, lll. [73] Assignee: Baxter Laboratories, Inc., Morton Grove, FOREIGN PATENTS OR APPLICATIONS lll. 9,700 1902 Great Britain ..l28/2l8 N [22] Filed: 1970 Primary Examiner- Dalton L. Truluck [21 1 Appl. No: 88,438 Attorney-Scott J. Meyer Related us. Application um ABSTRACT A catheter needle uard'unit havin a hub with a cannula neetf .N.78,0l7,0t.16, g 8 [63] gg i ggzlgtg 0 ser 0 6 dle affixed therein to form a passageway through the hub and cannula, said needle being pointed at the distal end, and a needle guard means having a sleeve member with a longitudinal 52 US. Cl ..12s 214.4, 128/221 slot adapted m'snap Over the entire length of the needle in [51] Ill. Cl. ..A61m 05/00 snug relationship therewithto form a protective closure over 1 [58] Field of Search ..l28/2l4 R, 214.2, 214.4, 215, the point of the needle when in the closed position and 8/ 218 221 swingably fastened to the hub through an intermediate flexible connecting section. [56] References Cited UN lTED STATES PATENTS 4 Claims, 4 Drawing Figures 2,71 1,732 6/l955 Solomon ..l28/2l5 PATENTEM R 2 3,658,061

ml WT WW WW JOHN P. HALL ATTORNEY 1 NEEDLE GUARD This is a continuation-in-part of application Ser. No. 768,017, filed Oct. 16, 1968, now abandoned.

This invention relates to an improved catheter needle guard unit and to a method of making the unit. More particularly, the invention is broadlydirected to the post-injection protection of catheter needles used to make entry in the body of a patient for the placement of a catheter through a cannula.

In the administration of parenteral fluids, it is 'now common practice to make a venipuncture with a needle and then thread a sterile plastic catheter in the vein. This catheter is light in weight, flexible and can be taped to the patients arm to remain in place as long as desired without causing the patient any appreciable discomfort. This so-called indwelling" catheter is exemplified by the device disclosed in U.S. Pat. No. 3,335,723.

In such administration procedure, it is virtually impossible to remove the needle unless it contains a slot therein, and many surgeons prefer a needle without a slot. The needle must, therefore, remain around the catheter adjacent the patients body as long as the catheter remains in place. It is important in such procedure that the needle be immobilized to prevent its puncturing of the patients skin or cutting of the catheter. It has been customary heretofore to use adhesive tape, gauze padding and the like material to wrap the needle point for this purpose.

Recently, in U.S. Pat. Nos. 3,323,523 and 3,324,853, various needle protective devices have been suggested for catheter needles of the indwelling type catheter unit. While these devices are useful, they are not without disadvantages insofar as they possess somewhat intricate structures and are difficult to manipulate.

Other needle protective devices, such as the needle cap described in U.S. Pat. No. 2,7l 1,732 and the syringe shield as disclosed in British Pat. No. 9700,.A.D. 1902, while somewhat suitable as protective covers prior to needle. injection of hypodermic type syringes, are not suitable for immobilization of a catheter needle after placement of the catheter and withdrawal of the needle from the patient.

Accordingly, it is an object of the present invention to provide an improved catheter needle guard unit.

It is another object of this invention to provide a method of making an improved catheter needle guard unit.

These and other objects will be apparent tv the person skilled in the art after reading the specification and claims hereof.

Briefly stated, the catheter needle guard unit of this invention comprises a hub having a cannula needle afiixed therein to form a passageway through the hub and'cannula, said needle being pointed at the distal end, and a needle guard means comprising an elongated flexible plastic sleeve member with a longitudinal slot adapted to frictionally snap over the entire length of the needle in a relatively immobile or snug relationship therewith and thereby form a protective closure over the point of the needle when in the closed position and swingably fastened to the hub through an intermediate flexible plastic connecting section. This guard unit can be readily fabricated as hereinafter described. It is convenient to use in practice insofar as it is affixed to the hub of the cannula and can be conveniently snapped into place over the entire length of the neepliable or flexible vinyl plastic such as, for'examp le,

pointing out and distinctly claiming the subject matter regarded as forming the present invention, it isbelieved that the invention will be better understood from the following exemplary description taken in connection with the accompanying drawings in which:

FIG. 1 is a side elevational view embodyingprinciples of the catheter needle guard unit of the present invention.

FIG. 2 is a front elevational view of the needle guard of FIG. I.

- .FIG. 3 is a transverse sectional view of the needle guard taken along the lines 3-3 of FIG. 2.

FIG. 4 is a side elevational view showing the needle guard of FIG. 1 in the closed position.

Referring now to the drawings and particularly to FIG. 1, thereference numeral 20 is used to indicate generally the hub of a cannulahaving a bore therethrough' which can be adapted for fluid communication with any conventional parenteral fluid administration source at extremity 21. Cannula hub 20 preferably has a reduced section or nipple 22. A cannula needle 23 with a pointed distal end 24 for venipuncture isin axial alignment and fluid-tight engagement with cannula hub 20.

Needle guard 25 is composed of a sleeve 26 with a longitudinal slot 27 adapted to frictionally snap over and snugly fit needle 23 to immobilize the needle and provide a protective closure therefor when in the closed position, a collar 28 for convenient mounting to the nipple 22 of cannula hub 20 and a flexible plastic connecting section 29 intermediate to collar 28 j when in the closed position. Slot 27 preferably has a normal cross-sectional diameter or width at its opening which is slightly less than the diameter of needle 23 to facilitate this snapping action and immobilization. Collar 28 preferably is of a ring-like structure for convenience in manufacture and ready mounting to the nipple 22 of cannula hub 20. FIGS. 3 and 4, in particular, illustrate the flexibility of flexible connecting section 29 which is straight in FIG. 3 and curved in a slightly bulbous manner in FIG. 4..

In operation of the catheter needle guard unit, needle guard 25 is in the open position when needle 23 is used to make a venipuncture in the patient and readily snapped into the closed position manually by a finger of the operator after placement of the catheter in the patient and withdrawal of needle 23. In this closed position, needle 23 willbe immobilized to prevent its puncturing of the patients skin or cutting of protect needle 23 from damage, if desired.

The catheter needle guard unit of the present invention is preferably constructed in the manner illustrated in the attached drawings not only for the above described convenience of operation in practice but also for convenience in production. A-preferred method of making this catheter needle guard unit comprises the heat sealing ofan extruded flexible, slotted sleeve 26, having a pre-cut flexible connecting section 29, to a flexible ring-like collar 28 cut from a piece of tubing and then solvent sealing said collar 28 to the reduced section 22 of cannula hub 20. For thispurpose, the flexible, slotted sleeve 26 and the tubing for collar 28 can be conveniently made from a plasticized polyvinyl chloride, copolymers of vinyl chloride and vinylidine chloride, copolymers of vinyl chloride and vinyl acetate, polyvinyl acetate and the like flexible resins, whereas the cannula hub can be conveniently made of a relatively more rigid plasticsuch as, for example, polystyrene, copolymers of polystyrene and butadiene, and other rigid, solvent-scalable plastics.

It'will be apparent that many modifications and variation can be made to the particular embodiments of the invention described hereinbefore. For example, the needle guard 25 can be fastened directly to the cannula hub 20 or its reduced sec- 5 tion 22 without use of a collar 28. Also, cannula hub 20 and needle guard 25 can be fabricated as a single piece, for example, by injection molding of a suitable plastic resin such as polypropylene or polyethylene. The cross section of sleeve 26 can be U-shaped instead of horseshoe-shaped, although the latter shape is preferred for its better retention of needle 23 when needle guard 25 istin a closed position. The thickness and width of sleeve 26 can vary somewhat, depending in part upon the material of manufacture. Instead of being ring-like,

collar 28 can be triangular, square, or polygonal in cross-sec-' tional shape, generally depending upon the corresponding Still other modifications and variations can be devised by the person skilled in the art after reading the specification and claims hereof without departing from the spirit and scope of the invention defined herein. All such further-modifications and variations are included within the scope of the invention as defined in the appended claims.

What is claimed is:

1. A catheter needle guard unit comprising a hub having a v wherein the needle guard means includes a flexible plastic 7 cannula needle affixed therein to form a passageway through the hub and-cannula, said needle being pointed at the distal end, and a needle guard means comprising a flexible plastic sleeve member with a longitudinal slot having a normal crosssectional diameter less than the diameter of said needle and adapter to frictionally snap over the entire length of the needle in a relatively immobile relationship therewith and thereby form aprotective closure over the point of the needle when in the closed position following placement of the catheter and withdrawal of the needle and swingably fastened to the hub through an intermediate flexible plastic connecting section.

2. A catheter needle guard unit in accordance with claim 1 wherein the needle guard means includes a collar for fastening 'to the hub.

3. A catheter needle guard unit in accordance with claim 1 wherein the sleeve member is an extruded, flexible plastic sleeve with a horseshoe-shaped cross section and wherein the flexible plastic connecting section is pre-cut from, and part of, said extrusion. I

4. A catheter needle guard unit in accordance with claim 3 ring-like collar for fastening to'the hub.

Claims (4)

1. A catheter needle guard unit comprising a hub having a cannula needle affixed therein to form a passageway through the hub and cannula, said needle being pointed at the distal end, and a needle guard means comprising a flexible plastic sleeve member with a longitudinal slot having a normal cross-sectional diameter less than the diameter of said needle and adapter to frictionally snap over the entire length of the needle in a relatively immobile relationship therewith and thereby form a protective closure over the point of the needle when in the closed position following placement of the catheter and withdrawal of the needle and swingably fastened to the hub through an intermediate flexible plastic connecting section.
2. A catheter needle guard unit in accordance with claim 1 wherein the needle guard means includes a collar for fastening to the hub.
3. A catheter needle guard unit in accordance with claim 1 wherein the sleeve member is an extruded, flexible plastic sleeve with a horseshoe-shaped cross section and wherein the flexible plastic connecting section is pre-cut from, and part of, said extrusion.
4. A catheter needle guard unit in accordance with claim 3 wherein the needle gUard means includes a flexible plastic ring-like collar for fastening to the hub.
US3658061A 1970-11-10 1970-11-10 Needle guard Expired - Lifetime US3658061A (en)

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US4631058A (en) * 1985-06-24 1986-12-23 Burron Medical, Inc. Guard for right angle winged infusion needle
WO1987007162A1 (en) * 1986-05-29 1987-12-03 Lola June Thurecht Protective devices for canulas
WO1988000477A1 (en) * 1986-07-22 1988-01-28 The Victoria University Of Manchester Injection needle sheath
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US4778453A (en) * 1986-04-07 1988-10-18 Icu Medical, Inc. Medical device
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Cited By (200)

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US4326516A (en) * 1980-01-02 1982-04-27 Schultz Kenneth E Intracatheter-intravenous tubing lock
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