US2531893A - Hypodermic syringe - Google Patents

Description

Nov. 28, 1950 z. M. ROEHRv HYPODERMIC SYRINGE Filed Oct.' 25, 1947 INVENTR. ZbSacuMRoehP BY am .AT .T ORAL-1';i YsS Patented Nov. 28, 1 950 'i Exponent/no sYRiNGE Zbislaw M. Roehr, New York, N. Y., assignor to Mizzy, Inc., New York, N. Y., a corporation of New York Application October 25, 1947,' Serial No. 782,058

6 Claims. (Cl. 12S-215) It is among the objects of the invention to provide a surgical syringe of simple and inexpensive construction suitable for manufacture by mass production meth-ods, which has relatively few parts that are not likely to` get out of order and which is extraordinarily light in weight, sturdy and of small size for enhanced convenience of manipulation.

Another object of the invention is to provide a syringe suitable for repeated use, in which the hypoderniic needle bearing cap may readily be applied to the barrel to be maintained in position thereon without shift, under the substantial thrust exerted in the use of the syringe and in which a cartridge may be securely seated in the syringe barrel without play or movement therein, yet without resort to spring metal parts.

This application is a continuation in part of my copending application Serial Number 537,378, led May 26, 1944, now issued as Patent No. 2,461,481, dated February 8, 1949.

The subject matter in the present application, which is not claimed in the parent application,

is the bayonet slot structure whereby the capV of Fig. 3 in the process of being conformed into shape,

Fig. 5 is a longitudinalcross sectional view of the cartridge and Fig. 6 is a perspective View with parts broken away of the needle bearing cap.

Referring now to the drawings, the syringe comprises a metal barrel II having longitudinal window openings I2 exposing to view the glass grasped by the fingers while pressure is exerted upon the plunger knob I5 by means of the thumb.

The barrel of the syringe according to the invention is made of a unitary blank 25 of sheet metal, shown in Fig. 3 and desirably of brass which may be less than .03 inch thick. The blank is generally rectangular inform and has a median longitudinal slot 26 providing one window and longitudinal shallow lateral notches 2l and 28 along the side edges thereof which when the device is rolled into a cylinder as suggested in Fig. 4 determine the diametrically opposed window by the lateral edge to edge contact of the side portions of the blank.

Manifestly the blank 25 may be longitudinally creased to provide a barrel of any desired regular polygonal cross section, for instance, of square, hexagonal or octagonal shape, but the cylindrical form is generally to be preferred.

The blank is formed with a unitary circular median extension 29 at its upper end, which, when turned over at right angles to the blank, as shown in Fig. 4, forms a head or end of the barrel. The blank also has a unitary extension -or tongue 3e slightly spaced from said upper end and slit from the blank preferably in alignment with the side walls of the window formed by slot 26. The extension 30 is also bent at right angles t0 extend parallel to the head 29. The head 29 yand extension 3D are centrally perforated as at 3| to afford a bearing or guide for the plunger rod I4, the internally threaded cavity end I'I of which coacts with screw I8 extending from the piston 29 in the cartridge.

The blank also has a pair of short tongues 34 and 35 with their root ends 3B spaced desirably approximately ra half inch from the upper end of the barrel and their free ends extending downward therefrom as shown in Fig. 3. These tongues are turned outward to extend in diametrically opposed directions and are longitudinally embossed as at 3l to form stiff finger grips 2t, which are thus integral with the barrel, the

slots 38 vacated by said nger grip tongues con- The barrel stituting additional Windows for exposure of the cartridge to view. The blank also is desirably provided with short inturned tangs 39 and 40 which serve as stops for the upper end 4| of the cartridge I3.

rIhe rubber plug or stopper 23 at the discharge end of the cartridge is preferably provided with a thick flange 422 not `less than incl-ii thick, which extends over the rim 33` of the cartridge I3. The outer face of the plug may have an annular ridge 43 thereon to denne the area irr which the upper end 32 of the canula orrneedle 2| should be inserted in order that it may penetrate into the depression tfinYtheiinner-facef of the plug 23.

The lower end of the blank is provided with a pair of bayonet slots 45 eachW-ithtalockingdefpression d6 at its inner end. Cap 22 of the syringe which has the axially extendinghypo dermis needle 2l rigidly mounted therein as by weldingorsoldering is' provided with a pair of diametrically opposedfinturned' bayonet pins il? onthe inner wallsth'ereof desirably-insertediini said walls. The cap rim 48 extends'- snuglyover the bar-rel end- With the:A end' Selci? the needle extending beyond sa-id rim:

Itiw-ili be'seen' that in the* process-ofapply-- ing'the cap tothe* barrer theV thrust of Y`tlieneedle":

end-32'inpenetratingtherubberfplugBustransn'ittedl throug-h the'v length.; or the cartridge against the back: stops 1 39 andil'i as 'vbestzy shown: inligf- 2; so-that completey penetrationv of the rubber vplugl is" assured as 'might not be the case= if* the cartridgel Were notthus'farrested The length of the-icartridgeis`v` so chosen relative to tlie^ construction of' this barrelf that'theendz ofV the= rubberplugy 23 extends" slightly beyond" the*` bottom' rim Hl" of'itiie barrel'when the rim-lil of? tHe-cartridge abuts against stops 3g fand 49E Asf the -cap -221 isf-turned" otr-:the barrel? andv the bayonet'slots-d', the'flangeiof the rubber plugN 23@ willi be axially comp-ressedirom: the form shoWnuin-Figizto the form-:shosnzin Figi 2,' between thevbottom rim 'e'.ffofthe cartridgelandithe inner face S of the cap 22. has .beenimanually turnedtorits axially` innermost position'ihthebayonet slotsdfan'dthen released; the resilient' expansionV o'riiange-:M of the'. com*- pressedfrubber plugiiwill'force the bayonetzpins 45 downward; into theirJ lockingY depressions @'65, Thusany possible: looseningf of? the cap: during thefrexpulsion oi' the contents' ofthe-cartridge is-'l avoided as -is the' possibility of: movement 1 of vthe'- cartridge in the barrel.

The'. presenti` construction'V provides Va: resilient hangt-3142! whichoverlapsrirn 33:? ofthe cartridge.'y

and-'liesbetween said'irimandzthe inner'face 5&3.V

of' ther cap to w actas: a; Yresilientv buier therebef tween As there can: be noy direetcontact between.' the.. cartridge; rim 333' and the.` inner" iace 58 fof7 theecap; therefisino; danger of thezcartridge cracking; Wheirtheccaps turned home'.

To usethe: syringaitt is merely necessary to- Thus :after' the cap After injection a fresh cartridge and a fresh cap and needle may be introduced for re-use of the barrel, or the barrel, together with the cap and needle, may be sterilized for repeated use.

While the barrel has been shown as shaped from a unitary piece of sheet metal, it could be similarly shaped of any suitable material such asf'ae'blanli-` of? plastic,l or impregnated textile fabric or it could be moulded' or" any suitable material.

As the syringe is of small bulk and light in weightyit. can be manipulated by the user with greater ease and precision than the conventional bulky andk heavyr syringe.

As many'changescould be made in the above construction, and'many apparently Widely differentz-ernbodiments-of this invention could be made without departing from the scope of the claims; it'` is intended that all matter contained in the above descriptionor shown in the accompanying.I dra-.Wings shall. be interpreted: as illus tra-tire andy noir-in 1a .limiting'sensez I-Iayingithus` described my invention-,m Whatfl,l claimzas:new'anddesire tosecure by, Letters Patentzof the .United Statesv isz? cartridge" endA and1 the: cap; tendingr during use* ofthev syringe to push the cap outward4 and there;A byreiectively to lock` the bayonetslot';

2; Aasurgicalsyringe; comprising a-barrel hayaY .355ingbayonetslots withlocliing-ends, a closurev capk havinglbayonet pins'in theinterior thereof forcoaction With-1 saidbayonet slots, a: hypodermicr needle'permanentlyf mounted in saidv cap', anda cartridge insaidcasinghayinga flexiblerubbel #stopper extendingbeyond the end of saidA barrel and compressed against saidcapuinA theassemlo'lyf thrustof; the'. latter' upon` said* barrel,` whereby said@ compressed stopper*y resilientlyv urges; ther bafyonetpins into the'locking ends oi"4 the bayonet'f` slots. 3: A-surgical; syringes comprising abarrel hav'- ing bayonet slots with downwardlyf'turned. lock#- ingends,- a closureecaphavingbayonet pins-in the-interiorv thereofforccoaction with said: bayonet slots; a. hypodermicneedle permanently-v mountediinrsaid'cap; andacartridge-in said cas'- ingiliavingia flexible Vrubber stopper 'with a iiange unitary therewith; extendingbeyondY the endv of said barrel andoverlappingv the endof said cartridge, said ilangefbeinggcompressed against the-f, end` of said oa'rtridge'in` the assembly thrust of Saidz capr uponsaid'barrel, whereby said'V flangeresiliently urges said bayonet pins downward. into-the-lock-ing ends-,of said bayonet slots, and

thereby securely maintains the-cap on said barrel.'

4. A surgical syringe; comprising a. barrel, acartridge therein having aplunger in one end thereof anda rubber stopperin the other-,end ther.eof,inturnedY stops in; said barrel nearfthe upper end thereof for limiting.- the position of. saidcartridge, a hypodermic needle bearing'cap having abayonet lslot connection upon the-free end of said barrel, thek stops taking thethrust upon-the` cartridge in thek application of the'cap.` upon the4 cartridge andthe penetration of the needlethrough the rubber stopper;

5. The combination-recited in claim fl, in which theirubberstopper has a thick flange, compressed' inthe applicationthrust of thecap,-,andthe-bayonet slot has a locking depression, in which the ing with the shank of said screw, inturned stopsV in said barrel near the upper end thereof for limiting the position of said cartridge, a, hypodermic needle bearing cap having a bayonet slot connection with the free end of said barrel, the stops taking the thrust through the cartridge in the application of the cap upon the barrel and the penetration of the needle through the rubber 6 stopper in the assembly thrust of the cap upon said barrel.

ZBISLAW M. ROEHR.

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

UNITED STATES PATENTS 10 Number Name Date Re. 16,836 Cook Dec. 27, 1927 1,604,224 Friedman Oct. 26, 1926 1,734,356 Welch Nov. 5, 1929 1,752,384 Jamison Apr. 1, 1930 1,848,711 Hall Mar. 8, 1932 2,100,456 Spensley Nov. 30, 1937 2,446,692 Collins Aug. 10, 1948

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