US2875760A - Injection equipment - Google Patents

Description

March 3, "1959 c. HABER INJECTION EQUIPMENT 2 Sheets-Sheet 1 Filed Oct. 11, 1954 March 3, 1959 c. HABER INJECTION EQUIPMENT 2 Sheets-Sheet 2 Filed ont'. 11'.

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SBISS Pau-'jut e 2,815,760 INJECTION EQUIPMENT `Christian Haber, Rangendingen, Hohenzollern, Germany Application October 11, 1954, Serial No. 461,357 cleims priority, applieauen Germany oeteber 14, 195s 6 Claims. (cl. 12s-215) resides in the suction which occurs when a needle is removed from the syringe. This suction causes the needle content to move toward `the mouth of 'the syringe and thus to infect the syringe, making the latter unsuitable for further injections. Upon disengagement of the needle, in addition to the suction, capillary attraction, a molecular tension in the bore of the needle, and surface tension on the drop at the tip of the needle occur. When a needle with a softmetal contact surface is taken ot, suction occurs likewise, although not as strongly as with a conical coupling, but the capillary attraction, the molecular tension in the needle bore, and the surface tension at the tip of the needle make themselves felt to the same extent.

` The` disengagement of the conus or of other couplings of known construction requires not only undue time but also the use` of both hands,with or without auxiliary instruments, to displace the syringe upon opening the coupling. Such displacement may also cause displacement of the contents of the needle. Extensive investigations have revealed that with needle couplings 'of known design, infection `of `the syringe ac annotbe safely avoided.

The main object of the' invention is to provide improved injection equipment lwhichovercom'es the above indicated disadvantages.

This object is realized by the provision of injection equipment including a device adapted to` withdraw, hold, and eject a needle. In accordance with the invention, these operations may be performed by one hand.`

" Inl accordance with another object and feature of the invention, the needle is removed from the syringe, after the inoculation, by sliding it oi laterally.

The various objects and features of the invention will appear from the description which will be rendered below with reference to the accompanying drawings showing embodiments to -give examples. In the drawings,

Fig. 1 is a part sectional view taken through a device, according to the invention, for withdrawing, holding and ejecting injection needles;

Fig. 2 is a view similar to Fig. 1, but with the needle removed;

Fig. 3 represents a flanged needle of the present invention, with the ilange portion shown in section, indicating that the needle extends to the base of the flange;

Fig. 4 is a longitudinal part sectional view through the needle and the mouth of a syringe, illustrating an intermediate position of the needle while sliding oi the mouth of the syringe;

Hice

` 2 Fig. 5 is a plan view of the device of Fig. 1, with the lever of Fig.rl removed, but showing locating pins; f Fig. 6 is a view similar to Fig. 5, the lever being shown; Fig. 7 is a part sectional view through an injection syringe with needle, an ejection pin being pushed back, and an ejection spring in set condition;

Fig. 8 is a plan view of the syringe of Feb. 7 out needle; t Fig. 9 is explanatory of the ejection of the needle from its seat on the syringe;

Fig. 10 is aplan view of a piston rod brake with release lever; v Q Fig. 11 is a side Aview of the closure of the syringe comprising a cam disc which constitutes a modified means for the release of the piston rod brake; v

Fig. 12 is a plan view of the cam disc; and Figs. 13 to 16 show several modifications of the resilient disc or membrane. Referring to the drawings, and iirst to Figs. 1 to 6, the device for withdrawing, holding, and ejecting needles, as shown in Fig. 1, comprises a tubular metal member 1 but withwhich by means of a set screw 13 is secured to an injection syringe 14, but which may as well form part of the syringe mouth. The metal member 1 is provided with two extensions 11 (Fig. 5) with bores 12 formed therein which receive a pin 3 on which the angularly shaped lever 2 pivots. A spring 4 is fastened at one 'end to the lower part of the lever 2, the other end of the spring pressing against the metal member 1. An ejection spring 5 which is bent approximately at the same angle as the pressure lever 2 is mounted on top of the lever. Stop and locating pins 6 and 'l'` ensure perfect alignment of the needle flange 8 and the mouthpiece 9 of the syringe and, as shown in Fig. 2, are of suicient length to prevent the pressure lever from resting on the mouthpiece 9 when no needle is attached to the mouth.`

The inoculation syringe of the invention is operated as follows:

For the withdrawal of a needle according to Fig. 3, from a needle magazine or holder (not shown), in which a plurality of needles may be held in horizontal position, the lever 2 is operated or depressed, and the forked ends 15 of the lever (see Fig. 6) are slipped over the tlange of the needle. The lever 2 is thereupon `released and the needle is pulled out from the holder by means of the forked lever ends, using a single hand. The two locatingl pins 6 and 7 cause exact superposition of the needle ange 8 and the syringe mouthpiece 9 so that the bores of the syringe and the needle will be coaxial. As the` needle is attached to the syringe, the ejection spring 5 is simultaneously set to the position in which it is shown in Fig. 1. The pressure of the spring 4 attempts to rotate the lever 2 clockwise, thereby causing the ends 15 to exert axial pressure on the' flange 8 of the needle and thus holding the needle in place. Such pressure overcomes the lateral pressure exerted bythe ejection spring 5, such spring therefore remaining in its set position. After the injection, the lever 2 is somewhat depressed, thereby rotating counterclockwise and releasing the axial pressure exerted on the ange of the needle. The preset ejection spring 5 now can exert its force laterally against the needle base to effect instantaneous sliding ofIr of the needle from the syringe mouth 9. The bores in the needle and the syringe are sealed off during the sliding oit of the needle, preventing any displacement of liquid in the needle bore.

The connection of the needle with the syringe mouth, according to the invention, makes suction impossible. Due to the very high speed of the ejection movement, molecular tensions as well as the surface tension of the drop which usually hangs from the needle tip are without eiect. l"The mouth of the syringe remains sterile even with an unlimited number of needle changes. An in? fection of the syringe is, therefore, impossible.

o By-withdrawing agneedle-.tfroma sterilizermagazine holding -severi-al needles, without touching the needles, andby transferringfthe needles from the magazine to the syringe mouth directly and horizontally,.time is saved, particularly in massfinoculations, andv greater ,safety is gained inasmuch as any contact of they needle with other objects is positively avoided.

vReferring now to Figs, 7 and 16, the inoculation syringe is equippedwith an ejection device for. the needle, comprising a leaf spring 20 and a striking pin 21. The needle is Vprovidedwitha fiangedextension 33` having a bore 22"for alignment with the bore 25 formed in the syringe mouth. Theextensionsuch vas 33 prevents Vcon- -tactgof the, `skinrwith 'thesyrin'ge mouth and may also servefor holding theneedle inlthe sterilizer magazine. When the needle 22 is put inplace .on the syringe, the neck of the needle flange pushes thestriking pin back, land the pressure lever 23 presses the flange of the needle by the pressure of a spring 24 onto the syringe mouth. When the lever 23 is after injection slightly depressed, rotating counterclockwise,`the'axial pressure on the needle is.release`d, permitting the leaf spring 20 to return to its-original position and carrying the striking pin 21along, which in turn slides the needle across and ott the syringe mouth.

'The bottom closure Lof the syringe is formed Vby a cap nut'26, which `comprises aj resilient disc or membrane 27 serving as a brake on the piston rod 28. The rod 28.has adiameter slightly larger than the aperture in themembrane 27. The membrane is provided with radial Vslots 29, shown in Figs. 13-16. Adjacent to the resilient-disc 27 is a member, for instancea lever 30 proviledwith a hub 31 for the release of the brake action'when'the piston 32 is to be moved back. The hub 31 of'the lever 30 is pressed against the disc'27 and pries-the sections of the resilient disc or membrane away from the piston rod.

vIt will be appreciated `from the foregoing description that the construction and operation of the injection equipment presents the many advantages briefly outlined before.

Changes may be made within the scope and spirit of the Yappended claims.

I claim:

i 1. Injection equipmentcomprising ajsyringey having a v mouthpiece, and,r a-device-*for withdrawing an injection needle from a needle magazine and to put and hold such needle in -working engagement with said mouthpiece and toV thereafter release said needle andfeject it'from engagementwith said mouthpiece, saiddevice comprising an -angulargenerally L-shaped lever'having the short leg thereof forked for gripping a needle for withdrawal thereofj'from Va magazine, means for pivotally disposing said lever on the syringe, avrst 4spring carried by saidlever and exerting a force thereon which attempts to rotate it clockwise, thereby causing said short forked end thereof to exert axial pressure',` on said Withdrawn needle,

pressing such needle into working engagement with said syringe mouth, and second spring means carried by said lever, said second spring means exerting a force on said needle in lateral direction-which is inoperative during the working engagement ofsaid needlewith said syringe mouth, angular displacement of said L-shaped lever againstltheforce of said first spring releasing theV axial pressure exerted by said forked end on said needle and allowing said' second spring to exert its force laterally against ,said-needle-to release such needle and eject-ait from engagement with saidrsyringe mouth.

2. A structure-andcooperation of parts according to claim 1, wherein said mouthpiece forms a plane end surface extending perpendicularly to the axis of the syringe, said needle being providedwith a bottomiiangefforming a similar planesurface for;engagement with saidend surface of said mouthpiece in working position of .said needle.

3. A structure andcooperation of -parts accordingto claim 2, comprising pins carried byl said mouthpiece for defining the working position of said needle ange inengagement with said mouthpiece.

4. A structureand cooperation of parts accordingto claim 2, comprising a cylindricalrextension projectingrfrom said needle flange in the directionof the yneedle point.

5. A structure and cooperationof parts` according to claim 1, comprising a striking pin cooperatively disposed with lrespect tothe shortlegof said L-shaped lever, the outer end of Vsaid striking pin being in engagement with said second spring and laterally'inwardly biased thereby in the` direction of the needle in its operating engagement with said mouthpiece.

6. A structure and cooperation of parts according to claimjl, comprising a piston slidably disposed in said syringe, a piston rod for moving said piston, and brake means for said pistonrod comprising a membrane-like resilient disc, said piston rod extending through a hole l:tormedin said disc the diameter of Which is slightly smaller thanjtheldiameter of said piston rod, slots being formed Vin said disc extending from the hole formed therein, whereby said piston rod is held in actuated position with the piston advanced .within said syringej in the vdirection of said mouthpiece, and means for exerting pressure on said slotted disc to release saidl pistonrod for return` of said pistonI away from said mouthpiece.

References cited in the fue of this, patent 'UNrrED Vsm'rlss PATENTS

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