US1569457A - Syringe - Google Patents

Description

Jan. 12 1926.

. H. M. CARSTENS SYRINGE Filed March 24, 1924 Patented Jan. 12, 19 26.

UNlTE'D STATES PATENT OFFICE.

HENRY I. GARSTENSQOF OAK PARK, ILLINOIS.

SYRINGE.

Application flled'ltarch 24, 1924. Serial No. 701,302.

To all whom it may concern."

Be itknown that I, IIENRY M. CARSTENS, a citizen of the United States, and a resident of Oak Park, Cook County, and State of Illinois, have invented certain new and useful Im rovements in Syringes, of which the following is declared to be afull, clear,

and exact description.

This invention relates to syringes, and in its present form, it has been designed espethe cylinder and the hollow needle of the syringe.

Another object is to provide a filling and discharge control device that may be readily attached to or removed from standard types of syringes having the proper threaded connection for the device.

Another object is to provide an adjustable stop collar for the plunger rod or s eeve of the syringe, which is of novel and improved construction, capable of instant adjustment to any desired place on the plunger rod or sleeve, whereby predetermined measured doses may be injected.

Another object is to provide a stop collar that may be freely adjusted in one direction by sliding it on the plunger rod or sleeve to the desired place thereon, and having a ratchet like connection with the plunger rod or sleeve for preventing backward movement on said rod or sleeve, except when the ratchet like connection is released by the user.

With theseand other objects and advantages in view, this invention consists in the several novel features of construction, arrangement and combination of parts, hereina ter fully set forth and claimed.

. The invention is clearly illustrated in the accompanying drawing, in which Fig. 1 is a-view, partlyin side elevation and partly in -central, longitudinal section, of a syringe, embodying a simple form of the present invention; Fig. 2 is a view, partly in side elevation and artl in cen tral, longitudinal section, of. t e fi g and discharge control device, showing the push plug thereof in depressed position; 'Fig. 3 1s a vertical section taken on theline 33 of Fig. 2; Fig. 4 is a detail, crosssection taken on theline 44 of Fig. 1; Fig. 5 is a detail, cross section taken on the line 5-5' of Fig. 1 and Fig. 6 is a plan of a fragment-' of-the plunger rod or sleeve and stop collar.

Referring to said drawing, which illustrates one embodiment of the invention, the

reference character 10, designates the syringe cylinder, 11, the plunger, and 12 the.

plunger rod or sleeve, of a standard or commercial syringe of common and well known construction. Thecylindrical wall 13 of the cylinder is shown as formed of a, lass tube, and its ends are held against pac 'ng washers bycylinder heads 14, 15, as is well understood. Thehead 14 has acentral aperture 16 through which the li uid is drawn into the. therefrom.

Removably secured on thecylinder head 14 is the filling anddischarge control device 17, the connection between the two cylinder and disc arged 4 being here shown as comprising a threaded nipple 18, on thebody portion 19 of the filling anddischarge control device 17, and an internally threadedboss 20 on thehead 14. The threadedaperture 16 isthe one above referred toas the one through which the liquid is drawn into the cylinder and discharged therefrom.

Thebody portion 19 of the fillin anddischarge control device 17, is bored ongitudinally of itself and in thebore 21 is slidably mounted apush plug 22, which contains a lengthwise extendingintake passage 23, which leads from its outerend 24, ,to a

point beyond the nipple 18, where the pas.

sage 23 terminates in allaterally extending aport 25, which is normally closedby the wall of thebore 21. Below the'port 2fi thepush plug 22 is formed, with anannular groove 26,-; which forms. a passage, and inv the body 19.;d're formedpassages 27, 28, the

passage 27' leading from thebore 21 of thebody 19 to the interior of thecylinder 13,

and thepassage 28 leading ,from the. bore 21 to and through anipple 29 formed on thef body 19, oppos te to the nipple 18. When in normal'position, as shown in Fig. 1, the

passage 26 of the push plug, connects thepassa es 27,-28, whereby the contents of the cylin er may be discharged whenever the plunger is pushed forward. Removably secured on thenipple 29 is ahollow needle 30 such as is used for making injections under the skin, and said needle may have a threaded connection with thenipple 29 as shown.

Thebody ortion 19 has packingglands 31, 32, threa edly secured on nipples at the opposite ends of the body, for making leak proof joints between the body and push plug. One end of the push plug is provided with a button orhead 33 against'which the thumb of the user may be pressed to depress the push plug, and a coiledcompression spring 34 is placed between thegland 31 and button 33-, which acts to restore the push plug to normal position after it has been depressed and released. The stroke of the push plug is limited by'a setscrew 35 which is threadedly secured in thebody portion 19 and enters agroove 36 formed in the push plug; and .said screw and groove prevent rotation of the push plug in the body portion. Thescrew 35 andslot connection 36 also act to stop the push plug at the places where thepassage 26 andport 25 register with the combined inlet andoutlet passage 27. On thelower end 24, of the push plug is secured aflexible filling tube 47 or other means for conveying liquid from a bottle or other container into the filling and discharge control device.

The syringe is of the kind in which a measured quantit of its contents may be dischar d each time the plunger is pushed forwar and an adjustable stop collar.37 is provided on the lunger rod orsleeve 12 for engaging the-en of thehead 15 and arresting movement of the plunger at the place where a predetermined quantity has been discharged, said stop collar and its connection with the rod orsleeve 12 are novel and will now be described. The collar is transversely slotted and in the slot is a detent ordog 38 which is movable transversely of the rod or sleeve and surrounds the same. The detent has atooth 39 formed at one edge of itscentral opening 40 for engagement with any one of therack teeth 41, which areformed on the lower side of the rod orsleeve 12.. Thedetent 38 has a stem 42 on its upper end which extends out through a hole in the collar and on the upper end of said stem is secured aknob 43 by which the detent may be depressed to disengage itstooth 39 from the tooth of the rack teeth'41 with which the detent is enged. A coiled. compression sring 44 is interposed between the collar 3 andknob 43 and forces the tooth of the detent into enga ment with the rack teeth'on the under-side of the rod or sleeve 12.- Therack teeth 41 andtooth 39 are beveled, as shown, whereby the collar may be freely moved on the rod toward the cylinder, but can only be moved back on the rod by first depressing before.

theknob 43 and disengaging the detent from the rack teeth of therod 12. The upper side of therod 12 is flattened and the apertures in thecollar 37 and detent 38 have flat upper edges to correspond therewith. This arrangement prevents rotation of the collar on the rod. The flat face of the rod is provided with a graduated scale having scale marks and figures indicating quantities corresponding to the dose which is to be discharged from the syringe at any time.

Apalm rest 45 is secured on the free end of theplunger rod 12, and in some cases said palm rest forms a handle or knob for expanding the washers of the plunger, but as this forms no part of the present invention, the details of said washers expanding device will not be described in detail.

To fill the syringe, thestop collar 37 having been moved back toward the palm rest, as far as it can go and the plunger 11.having been pushed to the' end of its discharge stroke, thefiller tube 47 is inserted into the bottle or other container for the serum orother fluid, thepush plug 22 depressed, and theplunger 11 drawn back to the end of its intake or suction stroke. The push plug is then released. It will be noticed that the thumb of the hand holding the syringe. may be used for depressing the push plug, while the other hand may be used for drawing back the plunger. When the push plug is depressed, communication is established between theintake passage 23 in thepush plug 22, and the combined inlet andoutlet passage 27 in thebody portion 19, which opens to thesyringe cylinder 13, and that when the push plug is released, thespring 34 restores the push plug to normal position, shutting off communication between thepassages 23, 27, and establishing communication between thepassages 26,

27, 28 to thehollow needle 30.

The cylinder holds a suflicient amount of the fluid for several small doses and the amount of the first dose having been determined, the user sets thestop collar 37 at the proper mark, and this is done by slidin the collar forward along theplunger r 12, the detent 38 passing freely over therack teeth 41 and snapping into the notch below the line where the collar is stopped. The syringe is then used by inserting the hollow needle under the skin of the animal and theplunger rod 11 pushed forward until thecollar 37 strikes againstthe end of the cylinder head .15. For injecting another dose the collar is moved back to the proper graduation mark, and the syringe used as It will also be observed that the normal position of the push plug is one in which the passage between the cylinder .13 andneedle 30 is continuously open, and that the act of shifting thepush plug 22 to establish ind I communicationbetween the cylinder and with one hand, leaving fillin tube is accomplished by merely pressing own on the push plug with the thumb of the hand holding the syringe.

By providing an. automatically returned push plug, the filling and discharge control device is always in proper position for the discharge of the contents through the needle, and the user is relieved of the care of proprlp setting said control device. Byprovi ing a thumb operated plug, the user may hold the syringe and operate the plug the other free to draw back the pl r. The filling. and discharge control device may be formed as a part of the equipment, or may be sold separately therefrom and constitutes a unit in itsef. Y More or less variation of the exact details of construction ispossible without departing from the spirit of vthis invention; I desire,

therefore, not to limit myself to the exact form of the construction shown and described, but intend, in the following claims, to point out all of the invention disclosed herein.

I claim as new, and desire Letters Patent: o

1; A syringe fillinganddischarge control to secure by 1 device for syr1nges,eomprising, in combination, a body portion having a. main bore therein, a combined inlet and outlet passage and a discharge passage, opposite thereto and opening to said bore, a ush plug slidably mounted in said bore and aving a discharge passage normally registering with said com bined inlet and outlet passage and with said filler tube and discharge passage of the body portion, and, having an mtake'passage opening from a rminating in a port nor- -*'mally out of register with either passage of the with the combined inlet and outlet passage body portion but adapted to register of said body portion when depressed to a means for autoplug to normatically restoring said mal position whenreleases.

2. A syringe filling and discharge control device for syringes, comprising, in combination, a body portion havin a main bore therein, a combined inlet an outlet passage and a discharge passage opposite, thereto and opening to said bore, a hollow needle secured to the body portion at the end of said discharge passage, a push plug slidably mounted in said bore and having means for connection with a liquid, container, said push plug having a discharge passage normally connecting said combined inlet and outlet-passage with said discharge pamage of the body ortion, and having an intake passage opening from a filler tube and terminatmg in a port normally out of register with either passage of the body portion but adapted to register with said combined inlet and outlet passage of the body portion when depressed to a second position, and a coiled compression spring interposed between said body portion and push plug, and actin to restore said push' plug to normal position when released 3. In a syringe, the combination with a syringe cylinder and plunger therein, of a fillin and discharge control device, having a y portion -renriovably secured to the discharge end of said syringe cylinder, there being a combined inlet and outlet passage in said body ortion, opening to the mterior of said cylin er, and a discharge passage in said body rtion, and a spring actuated push plug s 'dably mounted in a bore in said body portion and havinga dimharge passag normally establishing communication bet een said combined inlet and outlet passage and said discharge'passage of the body portion, and having an intake passage ope'ning from a filler tube and terminating 1n a normally closed portarranged to register with said combined inlet and outlet passage when the-push plug is depressed to a second position.

Chicago, March 17, 1924.

. HENRY M. CARSTEKS.

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