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Publication numberUS2515956 A
Publication typeGrant
Publication dateJul 18, 1950
Filing dateJan 21, 1949
Priority dateJan 21, 1949
Publication numberUS 2515956 A, US 2515956A, US-A-2515956, US2515956 A, US2515956A
InventorsCharles J Greenberg
Original AssigneeCharles J Greenberg
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 2515956 A
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Description  (OCR text may contain errors)

July 18, 1950 c. J. GREENBERG 2,515,956

SYRINGE Filed JanLZI, 1949 2 Sheets-Sheet l 1 '{III/ IIIIIIIIIIIIII /A 4 'IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIII ll IIIIIIIIIII INVENTOR. CAM/P465 L/ G/FZZ/VEf/PG aamfin ATTO/F/VEV July 18, 1950 c. J. GREENBERG SYRINGE 2 Sheets-Sheet 2 Filed Jan. 21, 1949 ATTOPA [y Patented July 18, 1950 SYRINGE I Charles J. Greenberg, Brooklyn, N. Y. 7

Application January 21, 1949, Serial No. 71,949

3 Claims.

This invention pertain to hypodermic syringes and particularly to a combination syringe adaptable for administering either minute, or comparatively large dosages.

Heretofore, it has been necessary to employ two species of syringes, one in which the dosages are measured by fine calibrations, for example, a syringe in which 1 c. c. is calibrated into .01 measurements, and another type of syringe in which 1 c. c. is divided into .1 calibrations.

My invention is capable of being employed for all kinds of injections, requiring either the fine, or larger dosages.

Briefly described, my syringe consists of abarrel having a conventional tip, the barrel provided with-fine calibrations on one lateral side and larger calibrations on the other. Cooperating with and reciprocally movable within the barrel I provide an intermediate plunger and an inner plunger, the latter also cooperating with and reciprocally movable within the intermediate plunger.

The intermediate plunger with the inner plunger fixed therein, is used for larger injections, while the inner plunger, with the intermediate plunger in seated position, can be employed for finely measured injections, while a combination of both may be used to increase the capacity of the combined inner and intermediate plungers.

A principal object is to provide in one syringe measuring and dispensing means whereby any type of liquid injection may be measured and dispensed with facility; another object is the provision of an instrument which may be handled with despatch whether measuring injections re-- quiring fine or larger calibrations.

A still further object is a syringe in which the possibility of breakage i minimized, and another object is an instrument wherein liquid materials may be measured and administered with the utmost accuracy, and one wherein the optimum in dosages may be achieved.

Other objects will be apparent from a perusal of the specification and drawings.

In the drawings;

Fig. l is a front elevation of one side of a preferred form of my invention.

r Fig. 2 is a rear elevation taken of the side op posite to Fig. 1.

Fig. 3 is an enlarged longitudinal sectional view of. the syringe with a large injection being measured. r

Fig. 4 is an enlarged longitudinal sectional view of the syringe with a fine injection being measured. ,1 1

Fig. 5 is an elevational View indicating the po- Fig. 8 is a similarbross-sec'tion "of a secondmodification.

Fig. 9 is an enlarged longitudinal sectional view partly in elevation of a further modification.

Fig. 10 is a cross sectional view taken on lines Ill-40 of Figure 9.

Fig. 11 is an end elevational view of the device shown in Figure 9.

By way of introduction, I contemplate the manufacture of my syringe in any suitable plastic material, such as Lucite, nylon or polystyrene or it may be manufactured of glass, or of any material having structural characteristics which lend themselve to use in a syringe of the character described.

Referring to the drawings, my syringe consists of barrel 5 preferably transparent, having its lower end provided with conventional discharge tip'B, adapted for holding the hypodermic needle 1 or other discharge means with theupper end of said barrel being formed with a peripheral fiange 8.

r On one lateral side of barrel 5 are fine calibrations' denoted by the numeral 9. The example disclosed is the division of l c. 0. into hundredths (.01) see Fig. 2. Other calibrations may be emplriyedthose denoted in Fig. 1 being illustrative on y.

On the opposite side of barrel 5 are what, for the purpose of explication, might be termed large calibrations ID, in contra-distinction to fine, as illustrated in Fig. 2. Here 1 c. c. is divided'into tenths (.1) and a maximum dosage equivalent to 3 c. cs may be measured.

Both calibrations 9 and Ill are graduated to correspond, in volume indication, to the content of chambers l3 and II, respectively, hereinafter described.

. Cooperating with barrel 5, which is centrally bored as at II, is intermediate plunger l2, in the form of a cylindrical-like rod, also centrally bored as at l3, the plunger l2 formed for close fitting reciprocal engagement with barrel 5. The lower end of plunger l2, when seated, abuts the lower end of barrel 5, while peripherally, on its opposite end is formed an annular shaped recessed member 14, suitable for being gripped by 3 the fingers when the plunger is to be manipulated.

For reciprocal movement within central bore I3 I have designed inner rod-like plunger I5, the lower end thereof adapted to be seated contiguous the lower end of barrel 5, the upper end also formed with plunger head I6 adapted to be manipulated by the fingers; plunger I is preferably, though not necessarily opaque. And, as shown in Figs. 1, 2, 3 and 4, recessed member I4 accommodates plunger head I6 when plunger I5 is in telescoped position and permits of the said plunger head being gripped by fingers when it is desired to retract same.

If the physician, nurse, or other qualified person desires to measure and administeran injection of a comparatively large concentration; plungers I2 and I5 are grasped unitarily, the first and second fingers holding plunger l2 and'the thumb impinging against member I6, the syringe needle: immersed. in, the: medicament, -a-ndvsthe lower ends of plungers I2 .and. I5withdrawnrto. the point opposite theeca'libration-on barrel 5 corresponding to. the dosage "desired.

Fig. 3 admirably illustrates the position; assumed by-theeplungerszI2-andzl 5 in; themeasurement of a large dosage, with chamber II accommodating the desired dosage.

After the measurement of the fluid' itimay; be administered in. the conventional manner? by positioning thesyringecneedlerwhere. desired; and then exerting pressure on: plunger" head I6 'to extrude or expel the medicament',i.plungers- I2 and i5-'b'eing impelled in the direction opposite to that indicated by the arrowssinFig. 3;

If more thanu3 c. cfs-eof medicament must-' be administered; anotheracapital advantage ofzmy syringe can beexploited; For upon'withdrawal ofplungers- IZ- andzi 5 as: a unit "to-the maximum 3.- c; c. calibration; plunger-'I5rcan bet-withdrawn still further to form: an: additional chamberr I 3 for accommodating an additional 1 '0.- (22,301 fraction thereof. Thisiadditional l cz-c'. orrpart thereof may .be iexpel'ledt'by-first impellingtplunger head F} Eto litS *closedwpositibn and continuingithe pressure on said plungerv head until? the: larger chamber H: is cleared" of "fluid: And'furthen a very minute amount ofzone medicament may be first measured within the smaller channelaIatto be mixed 1 later with v a" quantitative 'amount' :of another medicament in: thelarger channel H2 Fig. i depictsrtheFposition assumed by plunger I 5- when a minute or small amount of medica mentis to be measured andadministered, wherein plunger head I6 is withdrawn in the direction indicated-by the arrowswith chamber Iii-formed for accommodating the desired fiuid withuinter mediate plunger I 2 being seated; Infillingcham= ber I3, the finecalibrationsassshownrin eFigurefl would be employed, with the-.opaqi-1e-, or-coiored member I5-.enabling. a quick facile reading-of the same calibrations. When .the fiuid.,is .measured, plunger head -IB .-may be depressed,..for.the transfer or-administering of the medicament.

In Figs. 7 and 8 Ihave illustrated cross-sec,- tions. of modifications of my syringe wherein plunger I5 is'positioned other than concentrically with respect to plunger l2, without departing from the concept'of the--inventi0n.

Additionally, in Fig's.-8, 9} and 10 Ihave illustrated another modification; wherein barrel I9 is-provided with tip zfl; appended eccentricall-y with-respect to the'center of "the barreL Witli orifice 2| 'formed' to connect with optionai cham bers formed by theco'ope'rating segmented parts Ill 22, 23 of central plunger 24, said parts having shoulders 25, 26 acting as stops when the parts are closed.

In this modification, part 22 may be withdrawn and used as a plunger for the measurement of a fine dosage as to chamber 2'! connecting with orifice 2| in the position shown in Fig. 9; while part 23 may be withdrawn simultaneously with part 22 as one unitary plunger for the measurement of larger dosages, and when the two segmented parts 22, 23 are so withdrawn orifice 2| connects with a chamber formed by the retracted part of central plunger 24. Again the fine calibrations are on one side of the barrel and the larger calibrations of measurements i. e. l c. 0., 20. c., 3c. 0. are on the opposite side of the barrel as shown in Figs. 1 and 2.

The syringe is susceptible of further modificationwithout departing from the scope of the invention. For example, member it is shown recessed for. accommo'dating'plunger headi Ifirfand so that thelatter: may .be'igripped :by therfingers: I propose thatimem-ber'l l may beimanufactured. without the recess. Further the: partsimay'izbe made either transparent .or in :varied :colors: All or any parts ofdescribed syringes andmodifica tions ma be. mad'e-ofreither"heat'resistant glass,- plasticormeta'l; The plasticmay be eitherrnylon; Lucite, a methyl methacrylate resinior. 'polysty rene, these havingxsuch 5 physical. properties; as to resist heat orchemicalaction; so that littlecor no distortion takes. place to" interfere witl'irthei proper movements of the integral-.partscofthe syringe described: above;

I claim:

l; A syringe of the characterdescribed-com": prising, in combination; a barrel thaving fine: cali+ brations on" one 'iSlCle andxlarger. calibrations on the oppositeside, said barrelcentra'lly bored to provide a charn'loer having the same I dimension throughoutits length;v open atrone end and "closed: at the other end except for a discharge tip' lead ing from the chamber; a' pair:'of' "cooperating-cylindrical and rod-likepl'ungers of substantially different diameters; each 1 of said plungers proe" vided with heads, said plungersreciproca'llymovable within,iand' occupying the entire central bore'of the 'barrelgxthei-larger of said plungers-in close fitting engagement with the 'cham-benofitlie barrel, thesmaller' of therplungers reciprocally m'ovablewithinlthe' said 'larger plunger, said plungers adapted'to'be retracted and telescoped: singly and as. a"unit with'respect to. saidbarrel to measure and 'expel'liquids from thessyringe'; the larger. calibrations employable to "measure the contents Of' the chamber "provided'whenth'e pair' of" plungers 'are"retracted as a unit; the smaller calibrations 'employable' :to measure 'the contents ofthe chamber formed upon'retractiorr oi the head of'th'e smalle'riof thepair of plungers away from the headof the larger 'of' said pair of plungers.

2. A syringe: as'idescribed in'claim l wherein the barrel, intermediate andinner plungers-are formed of plastic material, the -barrel and intermediate plungers" of transparent plastic rmaterial and the inner plunger'oi-Topa'que' plastic'materiali' 3. A syringe of the character' described comprising a barrel provided with fine graduatedzealia brations-on one side thereof, and larger'graduated "calibrations on the: other side, said rbarrel centrally bored to provide a relatively largechanr; ber'for liquids, 'op'en aton'e .end and closed-atithe other except for a dischargei'tipileading therefrom, an intermediate cylindrical andarodel-ike plunger of greater length and less diameter than the barrel, the lower end of the said plunger abutting the lower end of the central bore of the barrel when seated, the outer end provided with a plunger head, said plunger bored throughout its length to provide a chamber therein of substantially less diameter and capacity than the chamber of the barrel, said intermediate plunger adapted to be received in the central bore of the barrel and for close-fitting engagement therewith and an inner rod-like and solid plunger provided with a head, said inner plunger adapted for closefitting reciprocal movement within the intermediate plunger, the lower end of said inner plunger abutting the lower end of the central bore of the barrel when seated, and said inner and intermediate plungers occupying the entire chamber of the barrel when seated, the large calibrations for measuring the contents of the chamber provided upon retraction of the intermediateand inner plungers as a unit and the fine calibrations for measuring the contents of the chamber provided upon retraction only of the inner plunger.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,180,051 Laurent Apr. 18, 1916 1,234,582 Trueblood July 24, 1917 1,652,894 Gunther Dec. 13, 192"! 1,863,785 Dickinson June 21, 1932 2,453,591 Poux Nov. 9, 1948

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US1863785 *Mar 8, 1930Jun 21, 1932Dickinson Fairleigh SSyringe
US2453591 *Nov 4, 1946Nov 9, 1948Noel J PouxHypodermic syringe
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US2919908 *Dec 27, 1956Jan 5, 1960Acf Ind IncInsulated accelerating pump
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U.S. Classification604/207, 92/52, 417/DIG.100, 92/245, 92/249, 604/218
International ClassificationA61M5/315
Cooperative ClassificationA61M5/31511, Y10S417/01, A61M5/19, A61M5/31531
European ClassificationA61M5/315D4