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Publication numberUS3136313 A
Publication typeGrant
Publication dateJun 9, 1964
Filing dateFeb 14, 1961
Priority dateOct 27, 1954
Publication numberUS 3136313 A, US 3136313A, US-A-3136313, US3136313 A, US3136313A
InventorsNojd John Adolf, Fredriksson Rune Gerold, Enstrom Hans Gosta, Rudolf A I Lundgren
Original AssigneeAstra Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Automatic hypodermic syringe
US 3136313 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

June 1964 H. G. ENsTRbM ETAL 3,135,313

AUTOMATIC HYPODERMIC SYRINGE Filed Feb. 14, 1961 United States Patent Swedish Patent No. 167,846 deals with a hypodermic syringe which comprises a syringe body, an injection needle, a holder for the injection needle, with the needle with its holder arranged in the body of the syringe so that the front end of the syringe covers and protects the needle when ready for use, an ampoule for a liquid to be injected, a spring arranged so as to force the needle holder with the needle out of its prepared position into an injection position as well as compressing the ampoule so that the liquid is squeezed out through the syringe needle, as well as a retaining catch by which the spring is held taut and released so as to bring about the injection. This hypodermic syringe is characterised by the combination that the needle holder with the hypodermic needle is provided with a backward-pointing perforator and in that the ampoule is compressible and is in its entirety movable in the body of the syringe and is located behind the needle holder, and that its front end has a wall that can be pierced easily by a needle, and that the spring is arranged, when released, to press on the rear end of the ampoule, so as to force the ampoule towards the needle holder, so that the needle is brought into its injection position, the perforator pierces the front wall of the ampoule so that the interior of the ampoule comes into connection with the needle, and the ampoule is compressed so that the injection fluid is forced out through the needle.

A fundamental characteristic of the hypodermic syringe according to said Swedish Patent No. 167,846 is that the ampoule is compressible so that the injection fluid can be expelled from the ampoule by the pressure exerted by the spring. In Patent 167,846, the ampoules shown as examples of the compressible type of ampoule, all have soft walls and can be collapsed so as to squeeze out the contents.

It has now been found that the ampoule can be a socalled cartridge type ampoule. In principle, this type of ampoule consists of a cylinder having rigid walls containing a piston which, when forced along inside the cylinder, squeezes out any liquid present in the cylinder. The compressessibility of the ampoule thus arises out of the fact that its volume is decreased when the piston is forced along inside the cylinder.

The walls of the cartridge type ampoule consists preferably of glass but other materials, such as plastic or metal are also conceivable, though in general one tries to avoid metal containers for the injection fluid because of the risk that metal ions would be dissolved in the liquid.

The piston and the front wall of the cartridge type ampoule may be made of rubber or plastic. In ampoules which may be stored for long periods plastic may be preferred, owing to its lower permeability, which results in a lower rate of evaporation of the injection liquid.

The accompanying drawing shows two embodiments of the hypodermic syringe according to the invention.

The syringe illustrated in FIG. 1 comprises a syringe body 1, the front part of which contains a hollow injection needle 2 and a cartridge ampoule 4. The injection needle is mounted in a needle holder 3 which can 3,136,313 Patented June 9, 1964 be moved along the body of the syringe. The rear end 7 of the injection needle extends backwards from the needle holder 3 and is sharpened to a point for piercing. The front end of the syringe body 1 is sealed by means of a rubber membrane 9. Inside this membrane there is a plate 10 with a hole through the middle. This plate serves to steer the needle when it is driven forward into the operating position.

The front end of the cartridge type ampoule 4 is sealed by means of a rubber membrane 8, while its rear end is sealed by means of a rubber piston 11 which is arranged to fit tightly during its introduction into the cartridge.

At the rear end of the syringe body there are mounted a number of preferably three or four, flexible fins 6 which are furnished with heels 12 arranged to engage with a flange 13 on a piston rod 14 which is arranged inside the syringe body. This piston rod 14 is actuated by a coil spring 5 which pushes it in the direction of the cartridge ampoule 4.

The rear end of the syringe body is enclosed by a cover 15 which is equipped with projections 19 fixed to the inside of the bottom and arranged to engage with the outer ends 20 of the fins 6 and to force these outwards when the cover 15 is pressed down to its extreme position. To prevent an involuntary release of the mechanism there is a flexible split ring 16 provided with a handle 18, preferably in the shape of a nylon cord, arranged round the body of the syringe so that it is partly against the edge 13 on the piston rod 14. The spring 5 now forces the piston rod down into the body of the syringe so that it presses against the piston 11 of the cartridge type ampoule. At first the rod 14 pushes the whole catridge type ampoule 4 forwards so that the perforator 7 pierces the front wall 8 of the ampoule, thereafter the ampoule pushes the needle holder 3 and the needle 2 forwards so that the needle pierces the rubber membrane 9 and is brought into position for injecting. T hereupon the piston rod 14 pushes the piston 11 into the cartridge type ampoule, causing the injection fluid to be forced out through the needle 2.

FIG. 2 shows an embodiment in which the upper portion of the syringe, containing the automatic operating mechanism, is the same as illustrated in FIG. 1 and is designated by the same reference numerals. The new features are the ampoule and the needle holder.

The cartridge type ampoule 21 of FIG. 2 is preferably made of plastic. Its front Wall has a portion 26 of a thickness suitable for being pierced by the rear end 25 of the hypodermic needle 24. The front wall of the ampoule has also protruding portions, forming a ring-shaped groove 28. The hypodermic needle 24 is mounted in a needle-holder 31, which has a cylindrical portion 27 arranged to engage with said groove 28 in the ampoule. A protruding rim 29 on the wall of the groove 28 engages with a corresponding groove on the surface of the cylindrical portion 27 of the needle-holder. Thus, the needle-holder is loosely held by the ampoule.

The needle 24 is enclosed in a protective cover having the shape of a bellows 30. The front end of the bellows, surrounding the needle, is closed, and keeps the needle sterile. The rear end of the bellows is mounted on the needleholder 31. The bellows is preferably made of rubber or plastic.

When the operating mechanism of the syringe of FIG. 2 is released, the rod 14 pushes the ampoule-needle assembly downwards, so that the needle 24 pierces the bel lows 30 and the rubber membrane 9 and enters into its operative position. When the needle-holdr 31' has reached its extreme bottom position, the ampoule 21 still continues its forward movement, viz. so far that the rim 29 disengages its corresponding groove, and the cylindrical portion 27 engages with the bottom of the rings-shaped groove 28. During this movement the rear end 25 of the needle pierces the thin arnpoule wall 26. The rod now pushes the piston into theampoule, and the liqui is pressed out through the needle.

The loose combination of the arnpoule and the needle-- holder provides a guarantee that the rear end of the needle does not pierce the ampoule until the needle has reached its operative position. The ampoule and the needle with its holder and its protective cover form an assembly which is easy to handle and which may be sterilized in one operation.

What is claimed is:

An automatic hypodermic syringe comprising a syringe body with an easily pierced front end; a cover enclosing the rear end of the syringe body; an injection needle; a holder for the injection needle, the needle with its holder being arranged in the syringe body so that the easily pierced front end of the syringe body, when prepared for use, completely encloses and protects the needle; a cartridge-type ampoule with rigid side Walls, with a movable rear end and with an immovable front Wall having an easily pierced thin portion, said ampoule containing an injection liquid and being in its entirety within and movable in the syringe body behind the needle-holder, said ampoule are combined to form an assembly and are loosely secured in a position in which the needle is separated from the interior portion by the thin portion of needle-holder being separate from and movable relative to said arnpoule but said needle-holder and said the immovable front Wall of the ampoule that is easily pierced thereby; means for piercing the pierceable front end of the syringe body with the needle before piercing the pierceable thin portion of the front wall of the ampoule; a spring and a cooperating piston rod disposed in the syringe body between the cover and the ampoule to act on the movable rear end of the ampoule; a retaining catch disposed in said cover by which the spring is held taut before it is released so'as to bring about the injection,

said spring, when released, causes the piston rod to exert pressure on the rear end of the ampoule and thereby forces the arnpoule toward the needle holder so that the needle .is brought from a prepared position into a position for injection by piercing the front end of the syringe body with the needle piercing the front wall of the arnpoule only after it is in injection position so that the interior of the ampoule comes into connection with the needle and the movable rear end of the ampoule pressing so that the injection fluid is subsequently forced out through the needle, the recited elements being joined so as to form a unitarydevice.

References Cited in the file of this patent UNITED STATES PATENTS France Apr. 27, 1959

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2661740 *Feb 7, 1952Dec 8, 1953Bishop & Co Platinum Works JDisposable syringe
US2701566 *Feb 7, 1950Feb 8, 1955Becton Dickinson CoInjection apparatus
US2832339 *Sep 2, 1953Apr 29, 1958Potter Pharmaceutical CorpHypodermic injector
US2845065 *Feb 5, 1954Jul 29, 1958Daniel GabrielDeception element for hypodermic syringes
US2871856 *Sep 6, 1955Feb 3, 1959Astra AbHypodermic syringe
CH331375A * Title not available
FR1193221A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3330279 *Oct 18, 1963Jul 11, 1967SarnoffAutomatic hypodermic syringe
US3426448 *Feb 2, 1967Feb 11, 1969Sarnoff Stanley JTraining injection device
US3882863 *Aug 1, 1973May 13, 1975Survival TechnologyHypodermic injection device having cannula covered with resilient sheath
US4194505 *Sep 15, 1978Mar 25, 1980Vac-O-Cast, Inc.Containerized hypodermic module
US4258713 *Jul 23, 1979Mar 31, 1981Wardlaw Stephen CAutomatic disposable hypodermic syringe
US4316463 *Jan 26, 1981Feb 23, 1982Vac-O-Cast, Inc.Corrosive protected hypodermic module
US4767413 *Apr 20, 1987Aug 30, 1988Habley Medical Technology CorporationDental syringe having an automatically retractable needle
US4822340 *Oct 9, 1986Apr 18, 1989Duphar International Research B.V.For injecting one or more injection liquids
US4983164 *Apr 12, 1988Jan 8, 1991Astra Meditec AbAutomatic two-chamber injector
US5080648 *Apr 7, 1989Jan 14, 1992Antonio Nicholas F DHypodermic fluid dispenser
US5102393 *Jul 17, 1989Apr 7, 1992Survival Technology, Inc.Autoinjector converted from intramuscular to subcutaneous mode of injection
US5167632 *Jan 24, 1992Dec 1, 1992New Potency Products, Inc.Syringe
US5318522 *Jan 8, 1992Jun 7, 1994Antonio Nicholas F DHypodermic fluid dispenser
US5354287 *Jan 16, 1991Oct 11, 1994Senetek PlcInjector for delivering fluid to internal target tissue
US5540664 *May 16, 1994Jul 30, 1996Washington Biotech CorporationReloadable automatic or manual emergency injection system
US5665071 *Jun 26, 1996Sep 9, 1997Washington Biotech Corp.Fluid medication injection apparatus
US5695472 *Mar 8, 1995Dec 9, 1997Washington Biotech CorporationModular automatic or manual emergency medicine injection system
US5700244 *Dec 22, 1995Dec 23, 1997Science IncorporatedFluid dispenser with fill adapter
US5709668 *Jun 6, 1995Jan 20, 1998Senetek PlcAutomatic medicament injector employing non-coring needle
US6056716 *Oct 25, 1996May 2, 2000D'antonio Consultants International Inc.Hypodermic fluid dispenser
US6276567Mar 29, 1999Aug 21, 2001Hydrus, Inc.Pressurized fluid delivery apparatus
US6401975Aug 17, 2001Jun 11, 2002Hydrus, Inc.Pressurized fluid delivery apparatus
US7255684Aug 8, 2005Aug 14, 2007Boris ZubryMedical injection system
US8162887Mar 25, 2011Apr 24, 2012Abbott Biotechnology Ltd.Automatic injection devices
US8636704Apr 29, 2010Jan 28, 2014Abbvie Biotechnology LtdAutomatic injection device
US8668670Apr 10, 2012Mar 11, 2014Abbvie Biotechnology LtdAutomatic injection devices
US8679061Mar 5, 2008Mar 25, 2014Abbvie Biotechnology LtdAutomatic injection device
US8708968Jan 24, 2012Apr 29, 2014Abbvie Biotechnology Ltd.Removal of needle shields from syringes and automatic injection devices
US8758301Dec 15, 2010Jun 24, 2014Abbvie Biotechnology LtdFiring button for automatic injection device
CN1119179C *Oct 5, 1993Aug 27, 2003塞尼泰克PlcMedicament injectors
EP0070594A2 *Jul 10, 1982Jan 26, 1983Tatoprint Nederland B.V.Tatooing device and program carrier therefore
EP0288443A1 *Apr 8, 1988Oct 26, 1988Astra Meditec ABAutomatic two-chamber injector, method for mixing and injecting, and injector cartridge
EP0700307A1 *May 26, 1994Mar 13, 1996Washington Biotech CorporationReloadable automatic or manual emergency injection system
WO1994007553A1 *Sep 30, 1993Apr 14, 1994Senetek PlcMedicament injectors and methods
WO1995031235A1 *Mar 8, 1995Nov 23, 1995Washington Biotech CorpModular automatic or manual emergency medicine injection system
WO2006020609A1 *Aug 9, 2005Feb 23, 2006Boris ZubryImproved medical injection system
Classifications
U.S. Classification604/139
International ClassificationA61M5/20, A61M5/32, A61M, A61M5/24
Cooperative ClassificationA61M5/3287, A61M2005/2407, A61M5/24, A61M5/2459, A61M5/2033, A61M2005/206, A61M2005/2488, A61M2005/247, A61M2005/2073
European ClassificationA61M5/20C, A61M5/24