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Publication numberUS1670570 A
Publication typeGrant
Publication dateMay 22, 1928
Filing dateMar 19, 1926
Priority dateMar 19, 1926
Publication numberUS 1670570 A, US 1670570A, US-A-1670570, US1670570 A, US1670570A
InventorsHein George N
Original AssigneeHein George N
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Inverted hypodermic syringe
US 1670570 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

2 Sheets-Sheet G. N. HEIN IN\`/`ERTED HYPODERMIC SYRINGE Filed March 19 1926 WWW/mf! 7g aum" May 22, 192s.


a@ /Mw @b4/ATV i Patented May 22, l928.l


yINvERTiain HYronnnMic sYnINen.

Application filed` March 19, 1926. SeraliNo. 96,014.

The invention relates to an inverted hypo? derniic syringe.

The oblgect ot theinvention is to improve the construction yof inverted 'hypoderinic syringes and to provide a simple, practical.

and efficient inverted hypoderinic syringe of strong durable and comparatively inexpensive construction in which the piston and the barrel inay have either a ground glass, metallic oi' aiielastic packing fit.V

A further object of the invention is to provide anv inverted hypoderniic syringe having a tubular or hollow piston and proa relatively short pistonhead to be provided s with either a ground glass lit oran elast-ic packing lit.

Another object of the invention jis to equip inverted hypoderniicsyringes of the larger type with means for slidinglyy guiding and steading the inner end of the barrel to enable a short piston head to be employed.

With these and other objects in view the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, villustrated in the accompanying dra-wings and pointed out in the claims hereto appended, it. being understood that various changes in the forni, proportion and minor details of' construction may be resorted to without departing from the spirit or sacrificing Vany of the advantages of theinvention.

ln the drawings Fig. l is a vertical sectional` view of an inverted hypodermic syringe constructed in accordance with this invention. t v

Fig. 2'is a horizontal sectional. view of the same.

Fig. 3 is a longitudinal sectional viewo an inverted hypoderniic syringe illustrating another form of the invention' in which the piston is composed of a plurality of sections.

Fig. 4f is an enlarged detailed sectional` view illustrating another form of joint.v and packing forA the sections of the piston.

Fig. a isa longitudinalsectional view i1- lustrating another form of the invention in which the piston is composed of sectionsl for the larger type of syringes.

Fig,` y6 is a detailed sectional view illustrating an elastic packing' for pistonsy of large hypodermic syringes.

Fig. 7 is a longitudinal sectional view of an inverted liypodermic syringe of thelarger type equipped with slidable barrel guidingv means. y v

`Fig.- 8 is a` horizontal sectional view through the holder or grip taken substantially on the line 8 8 of Figure 7.

Fig. 9 is a detail sectionalview; illustrat i i ing another forni of -st`em.

Fig. l0 is a detail'view illustrating the construction of .the resilient' fingers shown in Fig. 7. I

Fig'. l1 is a detail. viewof` the barrel of Fig. li shown in position for `receiving a medicament. l

Referring particularly to Figures andl 2 o t the drawings7 the inverted hypodermic syringe which is designed for the smaller type of syringes subjected to excessive pressure comprises in its construction a nietallic holder l, av hollow tubular piston 2` and a barrel `3. The holder which may be varied in construction and ywhich maybe made of Y any suitable material is 'composed of spaced i sides and connecting uppery andlower portions, the spacesv between the sides of the holder exposing the hollow piston and the barrel which are preferably constructedr ot' glass but which may be made 'ofi metal or glass. The upper andlower portions 3 and 4 are circular and the lower portion which is preferably thickened as shown forms a seat for the tubular piston and is provided lwith interior screw threads 5 .to be engaged by a threaded portionl Got the tubular piston whereby the piston isniounted upon the holder between the sides thereof in fixed relation to thesame.- The holder is provided tat yits upper end with vlaterally pro- Ijecting grips 7 which are preferably curved Dfi as shownto fitfthe fingers of the operator.

' The hollow tubular piston is reduced at thel lower end to 4forni the threaded portion or Vshank` and it 'is provided also at the lower end witha reduced projecting nipple j 8f adapted. 'to receive a hypodermic vneedle and preferably provided; with a tapered coiled spring 9 forpositivelyV holding theiieedle in place on the nipple. In; `practice the ica needle will be interlocked with the nipple and the latter is preferably provided with an annular rib or enlargement for engaging the upper coils of Athe spring. The piston which is designed in this form of the invention to have a ground glass or similar lit within the barrel is composed of an outer shell and an inner tube 11 which provides a bore or passage for the liquidcontained within the barrel. The barrel 3 is preferably provided with an enlarged upper end or head 12 presenting a flat upper face and adapted to serve as a base for supporting the barrel in an upright position to serve as a container for the liquid to be injected into the patient by the 'hypedermic syringe.y The ground glass barrel is telescopically placed over the *hollow tubular piston provided with hollow tub'ular'piston and is introduced between the same and the holder and thebarrel will be guided and a liquid and airtight oint is provided. In the form of the invention a perfect inverted hypodermic syringe is provided `without the use of an elastic gasket. The ground glass lit extends the entire length of the barrel and a similar smooth fit is provided when the barrel and the hollow tubular piston are constructed of metal.

In order to prevent the barrel from accidently dropping olf the piston in the han-` dling of the hypodermic syringe the latter is equipped with a frictiondevice consisting of a curved plate or member 13 arranged exteriorly of the holder at the upper end thereof and provided withr a protuberance 14 preferably formed byindenting the material of the plate 13 or bending a portion of the same at righthangles and extending through an opening 15 in the` holder and presenting a curved surface to and frictionally engaging the barrel as clearly illustrated. in Figure 2k of the drawings. The curved plate 13 conforms to the configuration of the holder and is connected with the terminals of a coiled spring 1G encircling the holder as'shown and yieldably maintaining the projection 14 in engagement with the barrel. The plate 13 is provided with perforations `leand the ends of the coiled spring are secured in the said perforations.

In Figure Soif the drawings is illustrated an inverted hypodermic syringe having a a ground glass fit and composed of an upper vsection 18 and a lower section 19. The piston shown in Figure 3 .is arranged within a metallic holder 2O constructed the same as that heretofore described but the holder may of course be made of any suitable material. The lower section of the piston is preferably constructed of metal and consists of a reduced stem portion provided at its lower end with a head 21 threaded to screw into the socket or opening 22 in the lower connecting portion of the holder 20. The said section 19 is provided with a nipple exten- 18 which is tubular and hollow is constructed i of glass and consists of an outer shell and v an inner tube 29 forming a passage for the liquid contents of the barrel 30 sliding telescopically over the upper section of the piston. The lower endof the upper section of the piston is provided with tapered extension or nipple 31which lits within a tapered extension 32 of the socket 27. The tapered extension of the socket presents inclined walls to the inclined surface of the nipple 31 and an air and liquid tight connection is provided. instead of providing the tapered extension or nipple and the tapered portion of thev socket a substantially cylindrical nipple 33 may bevemployed as illustrat-ed in Figure 4 of the drawings.' Nipple 33 which is provided with annular rib receives an elastic packing 35 which engages a smooth cylindrical portion 3G of the socket 37 of the lower section 38 ofthe piston shown in'Figure 4. The rib 33 causes an vannular projection or rib to beformed exteriorly of the elastic packing for engaging the smooth portion 36 of the socket 37. An an' and liquid tight connection is thus provided between the substance ofthe piston. A form of the piston shown in Figures 3 and 4 is for the purpose of reducing the area or length of the ground. glass tit or compacting surface of the piston@ This will enable a relatively long piston and barrel to bey einployed withv only a relatively short ground glass surface on the piston.r The saine construction. may of course be employed-when` the parts are made of metal and the contacting surface ofthepiston may be made relatively short in the same manner.

In Figure 5 of the drawing is illustrated a sectional piston forhypodermic syringes of the larger sizes composed of a lower section 3S) andan upper section 40. The upper section is preferably constructed of glass and the lower section 89 may ybe made of either glass or metal. The uppei'section telescopically receives a barrel 41 and a relatively short ground `glass surface is provided on the upper section of the piston to effect a liquid and air tight connection betweenthe piston and the barrel. The lower end, of the upper section is reduced to providel a threaded shank 42 which is'received within an'interiorly threaded socket 43 of the lower section 3Q-and the latter is provided with an upwardly extending stem 44 formed integral with the lower section and receivedv within .a longitudinal opening 45, y l y, l

yto accommodate barrels ot difierent'diain-y p in the upper section.V The. stem and the lower section are providedwith a bore 46- t-forin a Vpassage orthe.`liquid` or other contents of the barrel 4l and the upper end ot'v the stem may be tapered as shown at 47 to fit a vtapered portion 48 of the .opening 45. rl`his will provide ati'ght tit but a tight fit may be eliected bymeans of engaging the upper end of the stem with an inclined surface 49 as illustrated in Figure 9 of the drawings. ln this ligure the stein 50 is provided with a reduced upper end and the opening in the upper vsection l of the piston Ais provided with a conical portionlwhich is engaged by the upper edge of the stem lower sections 55 and 56 adapted to be con-l 50. Also as illustrated in Figure 6. the drawings the upper section may be reduced as showneat 52 and provided with an annular rib 53 which is adapted to produce an annular enlargement eXteriorly of an elastic gasket y54. The enlarged or distendedA portion of the gasket projects slightly beyond the side face of the piston for Contact with the barrel of the syringe. 1 v

InFigures 7 and 8 of the drawings is illustrated-a syringe of the larger type comprising a piston composed of upper and structed` of either glass or. metal and preferably secured together by a threaded connection. A threaded connection as shown in this `figure*.consistsgof a reduced threaded shanlr 57 which `screws into an interiorly threaded socket 58. The shank is preferably formed on the lower end of the upper section of the pistonl and the socket is provided in the upper end of the lower section which has an integral upwardly extending stem 59 arranged in a longitudinal opening 6() in the upper section of the piston. The upper section is shown provided with an elastic gasket 6l arranged on a reduced lupper portion 62 of the'upper section 55 of the piston and having a projecting annular portion 63 formed by an annular rib 64 of the reduced upper end portion 62 of the piston. The elastic gasket may of course be omitted if desired anda ground glass fit may be employed instead of the gasket. The inner or lowerend of the barrel is guided by a slidable guiding device comprising a hub 65 having an opening to receive the lower section of the piston and pro'- vided with a flange 66 upon which kis lmounted a'v plurality ol resilient barrel engaging members `67 preferably consisting vof approximately U-shaped lingers curved longitudinally aty their upper portion to provide a flaring entrance to the guide. The lingers 67 may be constructed of any suitable resilient material and their outer. or lower terminal portions are secured to the periphery of the flange 66 preferably in suitable recesses thereof as shown. The i removed and aheador section of a diilerent diameter may be appliedto the lower section to lit the'desiredxbarrel. .By this operation a variety.- of v different sizes of barrels" and .p istons may be employed and in the operav tion ot the hypoderrnic syringe theguidewill lmaintain the lower-end' of the barrelin proper positionr with lrelationto the piston.

yllhe piston .isniounted in -a-suitable `holderl' .which in theforni ot' the invention lshown in Figure 7 consists of a vhub 68 interiorlyv threaded zit-'69 to receive the lowerl threaded til) end portion 70 of the lowersection ,56.1 1; Ther 'holder is' provided with lateral extensions 7lk which. are prelerably-fconcave at the -side faces .to facilitate gripping and holding the piston.` Any-other suitableormof griporli; d

lioldermay beemployed and thef pistonis provided at its lower end with a nipple 72 and witlra needle holdingspring 7 3. The

bore 740i the lower section. forms, aA passage for the liquid or other contents of the barrel and the upper end of the extension 59 forms atight connection with the upper section of'k the piston preferably by ,being tapered as vshown but any otherforrn o/joint orl conneet-ionv may ofcourse jbe; employed.

lVhat is [claiinedis: y f o l. An inverted hypodermic springe coniprising a piston having anfenlargedfupper portion or head provided with a packing at one` endand having` a guiding portion eX- tendingbeyond the packing and a reduced lower portionfor stein, ka barrel ltelescopica-lly nia vfitted over the enlarged upper portion of the piston and guidedr by the same and a guide`A slidably mounted on the reduced llower portion of the piston and receiving and guiding the lower end of the barrel.

2. An inverted hypoderniic syringe-coini prising a piston having a` longitudinal bore or passage and vcomposed of an enlarged upperiportion or head and a lower" portion or rod, a barrel open at the lower end telescopicallyfitted over the enlarged upper portionr orhead land guided by the sameand a guide slidably fitted on and movable along the,


3. An inverted hypodermic syringe comy lower portion orrod of the piston and pror y prising a hollow tubular pistonhaving anl f upper enlarged portion or head and a lower' f vportion or rod, a barrel slidably fitting the upper portionorhead of the piston and a guidev slidably mounted on the lower portion or rod of the piston and consisting of a hub vit'orming a seat for the'lower end of thebarrel and resilient lingers carried by the hub and yieldingly` engaging the barrel, i

4. An inverted hypodermic syringe comprising a hollow tubular piston composed of upper and lower sections( provided with ineane for oetaohably Connecting thein together the upper Section forming a head 'v havingn vpacking portion and an extended guiding portion and a lower section being of leesdiaineter and constitutingv a 'piston rod, a stein extending 'from the lower section laeyond the connecting meane substantially through the upper Section ami providedr withinezine tor contacting.' therewith to forni a" tightjjoint and the barrel teleeeopieally itted over and guided by theupp'er section.

5. 'An inverted hypoderniie Syringe Conif o, holloiiv tubular pieton having :in

.enlarged upporportion or head and alre- 'dueed lower portion or rod detaohably oon- :neeted together, the upper section having` e,

packing `portion und an extended..guidi-ng portion and," the lower section beingprf vvided with a stein extending Leyond the detaohahle Connection ot the eootione substantially through the' upper section and engaging the saine, a barrel ehdahle over the upper section and 'guidedfby the saine and a holder y secured to thev lower Section.

tially through the upper section andl engaging,` the saine,-a barrel slidable'over the upper section andguided by the saine and a holder` Vconsisting of a huh seeuredto thelower end l of the lower section of the pistony and havingL laterally extending wingsl formingzgrips.-

7. An inverted hypoderinio syringeoom-v prieinga hollow tubular piston having' an enlarged upper portion. or headeand ya reduced lowerportion or rod, the lower section provided with a stein extendinglsubstan ially through the upper Section anden- 'aging the san'ie, a barrel slidehle overthe oetion and guided hy the saine, a `consistingv rol1 av hub :secured to the lower end ot the lower eocl'on oin the piston and hariilg laterally extending' wings forming grip-fs, and a guide lelidal'ile on the lower la he piston between the holder and 'the upper section and provided with means ttor liorining a seat for the barrel and having yieldahle ineens for retaining the barrel `on the seat.

' An inverted hypoderinio syringe Coin-` prieing a hollow tubular lpiston provided at the lower ende with screw threads and having a longituf al here extending Centrally through thepiston, said.y piston being also provided at its lower Lend witha proj eot'ing nipple Venlarged at the inner portion and grooved thereat tov receivea needle holding Spring, an' interiorly threaded `holder receiving the piston and detaehably engaging the screw threads` thereof,r and a barrel telescopically Aiitted over and-guided by the piston.v`

In testimony whereof I have hereunto set my hand. n


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4921142 *Sep 3, 1986May 1, 1990Ing. Erich Pfeiffer Gmbh & Co. KgManually operable fluid dispenser
US4946069 *Oct 5, 1988Aug 7, 1990Ing. Erich Pfeiffer Gmbh & Co. KgDispenser for manually discharging flowable media
US9352096Aug 19, 2010May 31, 2016Becton Dickinson FranceSyringe assembly with inverse delivery
US20110046604 *Aug 19, 2010Feb 24, 2011Becton Dickinson France S.A.S.Syringe Assembly with Inverse Delivery
U.S. Classification604/231
International ClassificationA61M5/24
Cooperative ClassificationA61M5/2429
European ClassificationA61M5/24E2