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Publication numberUS2862495 A
Publication typeGrant
Publication dateDec 2, 1958
Filing dateMay 6, 1955
Priority dateMay 6, 1955
Publication numberUS 2862495 A, US 2862495A, US-A-2862495, US2862495 A, US2862495A
InventorsGewecke Theodore H
Original AssigneeBaxter Laboratories Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hypodermic needle
US 2862495 A
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Description  (OCR text may contain errors)

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ATTORNEY United States Patent Qffice 2,862,495 Patented Dec. 2, 1958 HYPODERMIC 'NEEDLE '4 Theodore Gewe cke, Glenview, 111., assignor to Baxter Laboratories, Inc.

This invention relates to a hypodermic needle and, more particularly, to a hypodermic needle incorporating an improved structural arrangement whereby the need for orienting the sharpened end'is eliminated.

Although many forms of hypodermic needles have been used in the past, the most popular form has consisted of a tube of stainless steel provided with a sharpened-end achieved by a bevel cut. Although the bevel may be at a substantial angle, there is presented an elliptical opening which, upon skin puncture, may cause undesirable coring. Coring is deemed undesirable not only because of the increased pain, which is necessarily attendant on any skin puncture, but also because the cored portion might find its way into the blood stream which might result in an embolism. Furthermore, the puncture made by the conventional needle generally results in a scar which takes some time to disappear.

A real drawback in the conventional bevel-ended needle is the need for orienting the inserted end with respect to the vein wall. If care is not exercised, the beveled edge will lie against the vein wall, substantially retarding flow of liquid through the needle. To overcome this, many needle manufacturers provide some mark on the needle hub to indicate the plane of the beveled end. Notwithstanding such marking, often needles are inserted improperly or otherwise assume a position where the flow is retarded, necessitating the painful operation of orienting the needle.

It is, therefore, an object of my invention to provide a needle overcoming the above-mentioned disadvantages, especially in eliminating the need for orienting the needle. Another object is to provide a needle capable of achieving a substantially non-coring skin puncture. Another object is to provide a novel hypodermic needle structure wherein the fluid flow to and from the needle is achieved through at least two openings in the side wall thereof. Other objects and advantages of my invention will be seen as this specification proceeds.

Essentially, my invention includes a rigid tubular needle having a closed pointed end, the point thereof lying in the axis of the needle and being the end portion of an integral tapered section of the needle. To communicate the bore of the needle with the exterior, I provide at least two openings in this taperedportion.

My invention will be explained in conjunction with the accompanying drawing, in which Fig. 1 represents an elevational view of the hypodermic needle of my invention; Fig. 2 is a perspective view of the needle of my invention in its first stage of manufacture wherein openings are provided in the sidewall of a tube; Fig. 3 represents an elevational view of the hypodermic needle of my invention in the swaging stage of its manufacture, the completed needle being shown in dotted lines; Fig. 4 is a cross-sectional view taken along the line 4-4 of Fig. 1; and Fig. 5 is an elevational view partially in section of the hypodermic needle of my invention shown inserted into a vein.

Referring now to the drawing and, in particular, to Fig.

1, the numeral 10 generally designates the hypodermic needle of my invention. Needle 10 includes three integral elements: a straight tubular portion 11 which has a substantially uniform cross-section, a conical or tapered portion 12 at one end of straight portion 11, and a hub 13 atfixed to the other end ofstraight portion 11. It is not essential that hub 13 be provided, since it is possible to connect needles to flexible tubing without such a hub.- However, a hub is generally provided to facilitate insertion of an adapter 14, as can be appreciated from a consideration of Fig. 3, 1

I provide at least two openings 15 in tapered portion 12, which communicate with the bore ofstraight tubular portion 11. A method for providing this structure can be appreciated from a consideration of Figs. 2 and 3, wherein the needle is shown before the openings and sharpened point are provided. To achieve openings 15 I merely grind, as by use of grinding wheel 15a, or cut out portions of the side wall of member 11, adjacent the end thereof opposite the end provided with hub 13, as shown in Fig. 2. I consider it desirable to provide openings 15 as close as possible to the end of straight portion 11 so as to permit use of the needle in small veins. Once member 11 is achieved in the form shown in solid lines in Fig. 3, the end adjacent openings 15 is subjected to a swaging operation wherein tapered portion 12 is provided, the point thereof lying generally in the axis of straight portion 11, the resultant needle being depicted in dotted lines in Fig. 3.

The swaging operation is depicted in Fig. 3, where a swaging die is denoted 16. Swaging is a form of rotary reducing and, in essence, consists of uniformly hammering from a number of lateral directions the metal to be worked. The lateral direction of the applied force distinguishes this operation from staking, wherein the force is applied longitudinally of the member. Staking, for example, may be employed in securing hub 13 to tubular member 11, resulting in tapered portion denoted 13a in Fig. 1. Swaging is generally performed through the use of at least two rotating dies which have complementary faces. These dies are forced together at various angular positions to effect shaping of the stationary member inserted thereinbetween. This shaping in the present invention results in a portion characterized by a uniformly decreasing cross-section terminating in a point lying in the axis of tubular member 11.

By swaging the end portion of tubular portion 11, I achieve in one step an end that is superior to the ends of conventional hypodermic needles that required a number of operations to achieve. Conventionally,'a needle is cut, ground, buffed and the like in order to achieve sharp cutting edges. Many times conventional needles also have depressed portions in the vicinity of the heel of the elliptical opening in an attempt to minimize coring. Thus, the manufacture of such needles is an involved process.

The advantages of my hypodermic needle can be appreciated from a study of Fig. 5, wherein the needle is shown inserted into a vein 17. Openings 15 are so related with respect to the walls of the vein that it is impossible to block off the flow of fluid as frequently occurs in conventional bevel cut hypodermic needles. When such a situation arises, the nurse or doctor in attendance has to readjust the position of the hypodermic needle, which often causes pain or discomfort to the patient.

I prefer to provide oppositely disposed openings 15 in the tapered portion of the needle, as shown in Fig. 4. However, any angular disposition of openings 15 permits the achievement of a needle that is substantially non-blockable in the environment shown in Fig. 5.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations are to be inferred therefrom.

I claim:

1. A hypodermic needle comprising a metal tubular portion and a tapered end portionfan adapter-receiving hub on the other end of said tubular portion integral with said tubular-portion, said 'taper'edfport'ion being provided with at least two angularly opposed openings communicating with the bore of said tubular portion, the angular disposition of said openings being such that when said needle is inserted into a vein and one of said openings is blocked by the inner wallof said vein; the other of said openings is unobstructed by said vein wall.

' 2. The structure of claim 1, in which said'lopenings are contained Within only the said tapered portion.

'3. A hypodermic needle comprising a cylindrical metal tube having a pointed end achieved by swaging, at least Wall of said tube adjacent the pointed end thereof, said pointed end being swaged a distance sufiicient to include said openings.

References Cited in the file of this patent UNITED STATES PATENTS 648,858 Dolge May 1, 1900 1,951,654 Green Mar. 20, 1934 1,957,235 Simpson May 1, 1934 2,073,069 Lee Mar. 9, 1937 2,112,629 Lloyd Mar. 29, 1938 2,746,455 Abel May 22, 1956 FOREIGN PATENTS 818,246 Germany Oct. 22, 1951

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US648858 *Mar 14, 1900May 1, 1900Charles B DolgeEmbalming-needle.
US1951654 *Nov 7, 1931Mar 20, 1934Russell E GreenMethod of making a cable connecter
US1957235 *Jul 26, 1932May 1, 1934Nat Acme CoSwaged pusher and method of making the same
US2073069 *Jul 27, 1936Mar 9, 1937Lee RaymondEmbalming drainage tube
US2112629 *Sep 29, 1936Mar 29, 1938Lloyd RusselTrocar
US2746455 *May 12, 1954May 22, 1956Abbott LabVenoclysis equipment
DE818246C *Oct 20, 1949Oct 22, 1951Karl MunoKanuele fuer Injektionsspritzen
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3093134 *Jan 19, 1959Jun 11, 1963Brunswick CorpNeedle with molded hub
US3123072 *Mar 9, 1959Mar 3, 1964 Flexible tube coupling- and closing apparatus
US3173200 *Dec 8, 1961Mar 16, 1965Dunmire HannahMethods of making sharp-edged metal articles
US3294089 *Dec 14, 1960Dec 27, 1966Brookfield Richard AHypodermic needle
US3506007 *Jul 24, 1967Apr 14, 1970Henkin Melvyn LaneCatheter-needle
US3633580 *Sep 29, 1969Jan 11, 1972Knox Lab IncHypodermic needle
US4276880 *Dec 14, 1979Jul 7, 1981Oscar MalminCannula and process
US4413993 *Oct 26, 1981Nov 8, 1983Guttman Yolan RInfiltration-proof intravenous needle
US4585446 *Mar 16, 1984Apr 29, 1986Joseph KempfDialysis needle
US4790830 *Jul 24, 1987Dec 13, 1988Hamacher Edward NInfusion needle
US5360416 *Sep 30, 1993Nov 1, 1994Sherwood Medical CompanyThin-walled anesthesia needles
US5478328 *Sep 2, 1993Dec 26, 1995Silverman; David G.For reducing risk of infection from material in hypodermic needles
US5738650 *Aug 22, 1995Apr 14, 1998Becton, Dickinson And CompanySubarachnoid needle and method for administering therapeutic agents to the subarachnoid space
US6890319Aug 13, 1999May 10, 2005Imprint Pharmaceuticals Ltd.Apparatus for delivering a substance having one or more needles driven at high velocity
EP0606450A1 *Jul 14, 1993Jul 20, 1994Baxter International Inc.Cannula for use in drug delivery systems
U.S. Classification604/274
International ClassificationA61M5/32
Cooperative ClassificationA61M5/32, A61M5/3291
European ClassificationA61M5/32