US1646256A

US1646256A - William f

Info

Publication number: US1646256A
Authority: US
Publication date: 1927-10-18
Anticipated expiration: 1944-10-18

Description

W. F. PATTEN SYRINGE Filed Sept. 22. 1926 Patented Oct. 18, 1927.

j 1,646,256 PATENT OFFICE.

WILLIAM F. PATTEN, O WASHINGTON, DISTRICT 0F COLUMBIA.

*SYRINGR `Application led September 22, 1926. Serial No. 138,991.

This linvention relates to certain improvements in syringes; and the nature and objects of the invention will be readily recognized and understood by those skilled in the arts involved in the light of the following explanation and detailed description of the accompanying 'drawings `illustrating what I at present consider to be the preferred embodiments or mechanical expres.-r`

sions of my invention from among various otherforms, arrangements, combinations and constructions of which the invention is capablewithin thespirit and scope thereof.

. The invention is. particularly directed to syringes employed for hypodermic injections in the `practice of medicine and dentistry,

' and is more specifically concerned with such `syringes when of those types embodying a glass barrel or cylinder within which a glass plunger or piston is operatively mounted for drawing a charge into the barrel and for ejecting or forcing the charge therefrom in performing a hypodermic injection, although the invention is not limited to such types of syringes or to the materials of which formed.

These types of hypodermic syringes are generally typified by a ground glass plunger rod'of the same diameter throughout its length which is very accurately ground to form a close. running it with and in the syringe cylinder or barrel to provide a piston therefor, and in operation and use these plunger rods or pistons frequently fall or slide out and drop from the syringe barrels and are broken, soiled or otherwise rendered `unfit for further use. Due to the very accurate fit required of these plunger rods they are expensive and often diflicult to quickly replace, and where no replacement is immediately accessible and an emergency calls for immediate use of a hypodermic syringe, serious consequences to a patient can result.

One of the fundamental objects of the present invention is to eliminate possibility of a syringe plunger rod or piston falling or being accidentally displaced from a syringe, as Well as to provide for ready control of the plunger position in the syringe barrel where and when desired. f

Another object of the invention is to provide for maintaining a syringe plunger rod.

or piston against accidental displacement from a syrinUe barrel, through frictional engagement of the rod with an element formed `from and as a part of the syringe..`

Another object of the invention is to provide a resilient member for frictionally engaging the plunger or piston rod of a syringe to prevent accidental displacement of the rod and for holding the rod in a desired position, which member is so designed, formed and `mounted as to in no way interfere with the normal use and operation of the syringe, and which will not mar, scratch or otherwise injure the surface of the rod frictionally engaged thereby.

A further object of the` invention is to form and provide a member for frictionally engaging a syringe plunger rod to prevent accidental displacement of the rod, from and as an integral part of therubber or other material head of the syringe grasped by the fingers in operating the syringe and used as in which similar reference characters refer fto corresponding parts throughout the several -iigures thereof:

Fig. l, is a view in elevation of a syringe 1filling container with a `syringe mounted therein and a resilient member of theinventionv formed from the rubber syringe head and container stopper, in frictional engagement with the syringe plunger rod in accordance with the invention. Y

Fig. 2, is a vertical longitudinal section through the Lcontainer and syringe of Fig.

l, with the plunger rod raised and showing the rod engaging member of the invention in operative position. Fig. 3, is a top plan view of the container and syringe and of the member engaging the plunger rod, with the latter in sectio taken on line 3-3 of Fig. 2;

Fig. 4, isa side elevation ofthe stopper forming rubber head of the syringe showing the'rod engaging member formed therefrom in position prior to bending upwardl into operative rod engaging position n is'- clo'sino the; cut or incision through the head by which the member is formed therefrom.

plunger rod, with a modilied form of rod engaging memberriernied on. and lfrom. .the..

Y syringe head.V

y Fig. 6, is a. top plan View` ofV the headfl Y and member of Fig. 5, with the plunger rod Y in transverse section.andoperatively engaging the memberf" A foi-'maiid type 'o'l liypoderinic syringe is presen-teclherewith embodying va glass barrel -or cylinder and a glass plunger-br piston rod -Inountedtherein, together with a rubber '-,s'yringe vhead which is grasped by thelingers linfoperating the syringe and which'also v 4fo-rriis-astopper'or' clos-ure inliflling *the syringefrom a container.` "However, thedis- If c'los'e'df type ofsyringe is purely-.by way of eXamplea-ndfnot-of limitation, and is selected 2" because Ois presentsthe problem `and dili- `cul-ties overcome `by the Vinvention Iin a high l'deiggree--a-nd thus serves to more clearly illustrate rand -bring' forth -the invention, .the pijneiples-and fea-tures iof which are capable "-5 of general application Vto syringe-s and the *like effet-lier' forms, types and materials, as lwill beqreadilyrecognized bylthose skilled .iin-this art. Y

In theexample hereof, referring now to :iu-Figs: 2 and f1 of the drawings inparticular, .all hypodermicsyringe is disclosed which includestliefglass barrel orvcylinder havingftlie liypoderinicy needle 11- at the dis- 'lchargee'n'd thereof and the' opposite end open to receive aplunger rod and' formed 'with a kradia'lf-lange i12-'extending therefrom and therearound. 'A ground glass plunger rod *l1/Lis s lidably fitted into the openend of fthe syringe barrel y10 land extends thereinto ,.40 Atofformatightrunning iit therewith and provide t-he'piston or jplungerfor drawing` a. charge ofv liquid intothe-ba-rrel *aiidf for eje'cting the `saine ftlierefrom ltlirougli tlie Inee'dlef11atthe'jdischaige end of the :barrel The outer vend` offplunger rodv 14; is

'fferined with? the loperating headA 15 for r engagenient bytlie "hand, usually the' thumb thereof, tonforce the rod inwardly and ejectacha-rge from the barrel.` 'The plunger rod i1/Lis of the same diameter throughout its `length and is yerycarefully and accurately ground `to vform' the 4Arequired' tight but freely '-slidingitwitli the inner surface of the barrel 10. In practice it-isffoundypartieularly 5f* =ivv' ,lierift-he'syringe is heldfw-iththe 4needle 11 finleyatedposition, that the rod 14 frequent- -flyvslidesand dropisfrom the barrel 10 and is broken or otherwise rendered unfit for fur- Maherfuse,` as-will be readilyrecognized by *iU--.theseffamiliarwith such i types of sy-ringes.

-- end pf'barrejl 10 Aofthe. syringe,in= the present example,farubber head `or stopper 161-is ymounted thereover andft-herearcund, the head- 165- being'form'ed with an axial bore receivingfanel through; which the syringe barrel extends.

In mounted position the rubber -headl'iits up against and receives the flange `12 lof barrel 10,and isforined adjacent its klower end with the circumferential beadv 17, y yi:.-a s;,-will be clear by reference to Fig.V 2 of the drawings inparticular.` This head 16 -ernis a handsor dinger hold in the operation of the syi-ingefin carrying out-an injection 4therewith.as will beifclear totliosei skilled in the iart,'and' .further :forms .and .provides a stopper: for positioning i `the `syringe in 'and iclosing a container from-'which tliesyringe is .te fbe filled. '1'For-.exainple, insFigs. 1 vand 2, acontainer 18. issliown inlthe formfof a tubeclosed at'one'end and onenatrtheelp-y posi te end with a flaring mouthfand a groove "19 tlierearound. The chargefor'the syringe is placed-inthe `container 118, andthe syringe :barrel is inserted and .extended-into container -18 witlrftlieastopper or rubber: head 116 tting 'into and closing.` `the container and .position-x ingthe syringe-therein. I'Thezbead 717401? the syringe head 16. lits into .grooyefl-:Q ofzthe con- Vtainer and lioldsth-e head `16in` closingiposition against displacement, so that :therod i141 .caribe islid. or. moved.` outwardly i:.througigh syringe-barrelflO andthe desired'charge pdrawnithereinto.

fNow, according toatheinvent-ion, a member E20. is #provided frictionallyf engaging tthe lplunger .rod 14 `to .prevent :accidental ldisplfacementfthereof ffromfbarrel f\1()` but. withv out interfering with' .the-normal operation of `the plu-nger rod Orhandlingzofthe syringe finfperforming-.an injection.: 4This memberfQO is formed `from @the 1 rubber Vhead tor stopper -16fby transversely slitting or. cutting through ythe head adistan'cebelow the outer end thereies Hiiiat-ely equal .to :the v.depth Vorthiclmess Vvof l oli', inuthis instance `.at ai distance approxilbarrel flange .12',ialtho'ugh not solimited, and

terminating inwardly .or transversely th rough Vthe head a .distance sligliftlybeyond .the longitudinal center of-Hthestopper boren-andthe plunger rod. 14. The cut or `incision through Ahead '16to forni inemberi-QOisshown at-.f`21

in Fi g'. 410i .the drawings, and willl be .funden stood'by reference'thereto. The member 2l) is then rai sed and.. bentx ,upwardly and. out` .iw-ardly from the iboydy. of4 liead.16,-to yform in eect an outwardly extended bridge over and across o n-esidezoffthetopen end of syringe Y .lbarrelglwith the outer cross portion .oftthe member ipiioviding. a `bar for len-qagingtlie plunger rod.

` 1 rIlie .syringe `plunger-rod 1.4. isinserted into lthe barrel: 10- with the member'i 20 'bearing against the rod under tension-to rictionally engageitliefsaine, :due to vthe resiliency or -At the operating or'plunger rod receiving i Velasticity of.` Ithe material `from which ffoi'med,

1 and prevents. accidental .displacement ofthe ber 20 is formed will not scratch, mar or otherwise injure the accurately ground surface of rod 14, yet will exert sufficient pressure thereon to frictionally engage the rod and prevent its dropping from the s ringe, without interfering with the norma operation of the plunger rod. The friction or holding effect of member 20 is intensified because of the ground glass surface of rod 14 engaged by the rubber surface of the member, as will be readily apparent. The Amember 20 does not project laterally beyond the syringe head and is so designed as to in no way interfere with the usual handling of the syringe or the functions oi the syringe head 16. n

A modified form of. frictional engagin member 22 is disclosed in Figs. 5 and 6 of the drawings, in which form member 22 is formed as an integral projection extending from the outer side of head 16 and inclined inwardly toward and a distance over and above one side of the open end of the syringe barrel for engagement with the plunger rod 14. In the example hereof, the outer 'free end of member 22 is provided with a transverse groove or notch 23 to receive plunger rod 14, and the member is so designed that it is pressed outwardly with the rod in position and is thus maintained under and exerting tension on and against the rod. Obviously, the head 16, can be formed of other materials than rubber, or the member 22 can be formed as a separate element of thev same or different material from head 16, and embedded or secured therein, and the invention includes and contemplates such formations and mounting of the member.

It is also evident that various changes, modifications, variations and substitutions might be resorted to without departing from the spirit and scope of my invention and hence I do not wish to limit myselfto the exact and specific disclosures hereof.

Desiring to protect my 'invention in the broadest manner legally possible, what I claim is:

1.V In a syringe, including a barrel and a plunger therein, a head on the barrel adapted to form and be positioned as a closure for a container for positioning the syringe therein, and a member formed -fromsaid head frictionally engaging the plunger to prevent accidental displacement thereof from the barrel. Y

2. In a syringe embodying a barrel and a plunger rod slidably extending therein, a head on the barrel, and a relatively soft, resilient material member on the head frictionally en aging the extended end of the plunger rod.

3. In a syringe embodying, a barrel, and a plunger rod slidably extending therein, a rubber head on the barrel, and a member formed from and integral with said head frictionally engaging the extended end of the plunger end.

4:. In a syringe embodying a barrel and a plunger rod therefor, a head surrounding the end of the barrel through which the plunger rod extends, anda soft, resilient material member on the outer side of said head frictionally engaging the outwardly extending portion of the rod.

5. In a syringe embodying a barrel and a plunger rod slidably extending therein, a head of soft, resilient material on the barrel at the end through which said rod slidably extends, and a portion of said head extended outwardly and frictionally engaging said plunger rod.

6. In a syringe embodying a barrel and a plunger rod slidably mounted therein and extending outwardly through one end thereof, a rubber head on the barrel around the end thereof through which said rod extends, and a portion of the outer end of said head severed and bent outwardly to form a member bearing against said rod under tension and rictionally engaging the same.

7. In a syringe embodying a barrel and a plunger rod slldably mounted therein and extending outwardly through one end thereof, a rubber head around the end of the barrel through which said rod extends, said head formed with a transverse cut extending partially therethrough adjacent the outer side thereof and. terminating inwardly adjacent the `opposite side of the barrel, and the portion of the outer end of the head over said cut bent outwardly to form a member bearing against Vand frictionally engaging the outwardlyextended plunger rod.

ASigned at ,Washingtom D. C., this 18th day of Sept., 1926. j

WILLIAM F. PATTEN.