US1678991A - Plunger clip for syringes - Google Patents

Description

July 31, 1923. .Y

A. MARSCHALEK PLUNGER CLIP FOR SYRINGES Filed Nov` 2,' 1927 @fr-3- l' IIIIHIII lllll IIIHHIII'IIHIIHI llllllllli ,ar' gz Afro/Mfrs WITNESS ,gf www Patented July 31, 1928. t

ALEXANDER MABSCHALEK, or EAs'r RUTHERFoRn NEW JERSEY, nssrerivoi?. 'ro` PAT-ENT y"oFFl-ce.

BECTON,DICKINSO`N @c CO., OF RUTHERFOBD, NE'W JERSEY, A CORYORATION 0F NEW JERSEY.

PLUNGER CLIP FR SYRINGES.

Application led November 2,1927. Serial No.'230,405. i

This invention relates to syringes for medical use and has for an object to provide a construction wherein the plunger is held automatically in any desired position. I Another object of the invention is to provide in a medical syringe, a clip adapted to hold the plunger of the syringe against accidental movement either in the barrel of the syringe orin the sterilizer. A further obfect of the invention, more specifically, is to'provide a clip connected with the barrel of a syringe formed to grip the plunger of the syringe and to hold the same in any adjusted position within the barrel and also hold the same against loss.

when positioned exteriorly of thebarrel for sterilizing purposes.. f

This application 1s 1n part a continuation of applicants application for United States Letters Patent Serial No. 11,812, filed Feb? ruary 26, 1925.

In the accompanying drawing- Y Figure 1 is a side view of a syringe and clip, embodying the invention.

Figure 2 is a view similar to Figure 1 but showing the plunger held away from the barrel whereby the parts may be properly sterilized without either being lost.

vFigure 3 is a longitudinal vertical seci 3U tional view through the upper part `of the structure shown in Figure.1,'the same being on an enlarged scale.

Figure 4 is `a sectional view throughFigure 2, on line 4 4. j

Figure 5 is a fragmentary sectional view similar to Figure 4 but showing a modified and preferred form of clip.

Figure 6 is a side elevation of the preferred form of clip shown in Figure, 5.

Figure 7 is a view similar to Figure 3 but showing a modified construction of clip.

Referring tothe accompanying drawings by numerals, 1 indicates the barrel yof a syringe and 2 the plunger. Connected to the upper parti of barrel 1 is a metallic litting 3 of any usual or preferred form but preferably (as indicated in Figures 2 and 7 constructed in a manner to exert a resilient frictional clamping action on said barrel 60 sufficient to prevent unintentional movement of said fitting lengthwise thereof and so Vas to have anengagement with said barrel whereby any tendency of the fitting to cant or tilt relatively to the major axis thereof kis resisted, said fitting further being adapted t0 be engaged by the fingers whenthesyringe is being used. Inthe illustrated example the above mentioned results vare securedby constructing the fitting 3 in theform of an annular fitting meinbermounted uponthe .barrelvl and provided with resilient members 3a which project from said fitting member in the ydirection of the length of the barrel 1 and into resilient but'firm frictional engagement therewith. It will be noted that the fitting 3 vis provided with arms 4 and 5. The arm 5 carries av rivet` 6 which acts as a journal pin for the clip 7. The clip 7 acts as automatic means for holding the'plunger 2 in different adjusted positionsk and always in association with the barrel.1. This is very desirable as the bore of barrel 1 is ground to receivethe plunger2 and, therefore, `will not properly receive any other plunger which may be of substantially the same size.

Heretofore, in sterilizing the plunger and barrel, extra care had to be usedvin order to keep the ytwo members together or properly tagged so that they could be re-assembled. Also, it has been found that the plunger will move back out of the barrel when the barrel is inverted accidentally, This results in loss by breakageor loss of the fluid to be injected. By providing the fitting 3 with the resilient members 3a and the clip 7, means are presented which will hold the barrel and plunger in constant association as shown in f Figure-2. The clip 7'will thus automaticals ly lock or hold the plunger in any `desired adjusted position either within the barrel( (Figure 3) or outside of the barrel (Figure 2) andin either case without displacing the fitting 3from its proper position with respect to the barrel single piece of metal and in stamping is pro- The clip 7 is preferably stamped fromal vided with resilient arms 8v and `9 and anf` I upstanding neck 10 whichV merges into a flat section ll'through which the rivet 6 extends. The normal position of the armsB and 9 is such that the space therebetween is less thany thekdiameter of the plunger 2 .so' that whenever the plunger is forced between j these arms it will beheld by friction lin 'different positions. When the clip isholding ythe plunger in the position shown in `,Figure 1 forV instance, the syringe may vbe special features of advantage, is illustrated in Figures 5 and 6. In these figures the arms 8 and 9 are formed integrally With a reverse bend 101 and a flat section 111 and are provided with a plurality of spaced proectinv elements 8a 8b 9a 9. These nrc'ect- CD 3 7 7 l ing elements establish the spring Contact with the surface of the plunger and the use of such projecting elements causes the 'clip as a Whole to present a materially less area of Vsurface contact With the plunger Vthan is the case in the structure shown in Figure il. The resultant spacing of the surface of the clip from that of t-he plunger, except at a minimum number of contact points, permits a more thorough sterilization of the plunger in the sterilizing apparatus, While a slight .twist of the plunger as it is held by the clip during the sterilization period Will expose to sterilization treatment the points of the plunger formerly in contact with parts of the clip. Even if the plunger is not slightly rotated as suggested, the sterilization will obviously be more complete than Wherey the Vplunger is held in the manner shown in Figure 4. Althoughthe spacing of the clip from the plunger 1n the manner shown in Figure 5 reduces the area of surface contact Y between the clip'and the plunger and consequently tends to lessen the resilient gripping power. of the clip, it has been'found that a structure such asl illustratedin Figures 5 and 6 not only has adequate gripping power but by virtue of the diminution of the gripping force has additional advantages. Thus when the plunger is in the Abarrel and is used by the physician a relatively powerful grip of the :clip against the plunger interferes with the easy `manipulat-ion of the plunger Within the barrel Which lthe physician desires. formed as shown in lFigures 5 and 6 it not only minimizes resistance against easy ma-V nipulation of the plunger b utat the same time retains adequate gripping power to maintain the plunger at any desired point l Within .the barrel,even though` the instrument may be laid down or turned upsidev down, and also to maintain the plunger in the/clip tightlyn enough for the sterilization operation when the plunger is not `Within the barre-l, but is held adjacent thereto.

the correct When the clip is howeverl This softening of the resistance is accomplished by using the spaced projections 8, 8b, 9, 9, but is still further enhanced by the special clip struct-ure clearly shown in Figure 6. lt will be noted from that uligure that the arms of theclip have their points of tlexurenearer the` center of the bar-rel of the syringe and. farther from their free ends than the spring arms 8 and 9 of Figure 4, giving those arms a softer resilient action due to their increasetL length. This softer resilience serves to further modify any'eX- cessive gripping effect of thearms. The modification shown in Figures 5 and '6 is, therefore, one( which, possessing special advantages, constitutes the preferred form of the device.

Instead of forming the clip in one piece as shown in Figure l, it might be made in some other manner withoutdeparting from the spirit ofthe invention, as forinstance, in

the manner shown in Figure 'Z'. -lnthis ligure, the rivet l2 entends through arm 5, bushing 13 and the extension lll projecting from the juncture of the arms Sand 9. The function of the arms 8' and 9 in this form of the invention is identical With the func-- tion of the arms in the other form of the invention, theonly difference being the fact.

that the arms in this forni of the invention j in the extension 7 are stamped from flat sheet material and are all arranged inthe same plane.. This necessitates' the bushing 13 and an `entra long'rivet l2.

What claim is:

1. The combination with a syringe pro" vided with a plunger and barrel, offmeans for holding the plunger against accidental move-ment While 4in 'the barrel or holding the plunger out of the barrel but adjacent thereto, said means including a pair of gripping arms, and means for pivotally mounting said arms on said barrel so that it may swing at a right angle 'tothe barrel whereby the arms may be swung to grip the plunger While in the barrel and swung to a different position to grip the plunger when out of the barrel,V j

2. A. clip Vfor syringes, comprising a pair of resilient arms connected together at one point and provided withan extension. at said point, and means for p fatally connecting said extension to the barrel of said syringe so? as to swing in plane at right angles to the said barrel, arms being adapted to grip the plunger and hold the same in different adjusted positions.

'3. A. clip for syringes, comprising a pair of resilient arms formed from a single piece of resilient metal whereby said arms will produce .a resilient gripping action, said arms merging together at onepoint, means projecting from the point where said arms merge together, said means presenting an extension, and a rivet extending through said extension and part of the syringe for pivotally mounting the arms in position.

4. A clip for syringes, comprising a pair of arms oined together at one point, means projecting from the point where said arms are joined together', said means presenting an extension, and a rivet extending through said extension and part of the syringe for pivotally mounting the arms in position.

5. The combination with a syringe provided with a plunger and barrel, of means for holding the plunger against accidental movement while in the barrel or holding the plunger out of the barrel but adjacent thereto, said means including a fitting frictionally seated on the barrel, a pair of gripping arms, and means for pivotallyy mounting said arms on said fitting so that they may swing to a position of rest at a right angle to the barrel whereby the arms may be swung to grip the plunger while in the barrel and swung to a different position to grip the plunger when out of the barrel without displacing the fitting from its proper position on the barrel.

6. The combination with a syringe provided with a plunger and barrel, of meansv for holding the plunger against accident-al movement while in the barrel or holding the plunger out of the barrel but adjacent thereto, said means including a fitting provided with spaced resilient `gripping fingers eX- tending lengthwise of the barrel and frictionally positioning the fitting firmly on the barrel, a pair of gripping arms, and means for pivotally mounting said arms on said fitting so that they may swing to a position of rest at a right angle to the barrel whereby the arms may be swung to grip the plunger while in the barrel and swung to a different position to grip the plunger when out of the barrel without displacing the fitting from its proper position on the barrel.A

7. A clip for syringes, comprising a fitting provided with resilient gripping fingers to frictionally position the fitting firmly on the barrel of the syringe, apair of. resilient arms connected together at one point and provided with an extension at said point, and means for pivotally connecting said eXtension to said fitting so as to enable the resilient arms to be swung to a position of rest in a plane at right angles to the barrel, said arms being adapted to grip the plunger and hold the same in different adjusted positions in the barrel and to grip the plunger when ally seated on the barrel, a pair. o f gripping arms, a plurality of spaced projecting elements associated with said gripping arms and adapted to establish contact with the surface of the plunger', and means for pivotally mounting said arms on said fitting so that they may swing to a position of rest at a right angle to the barrel whereby the arms may be swung to grip the plunger while in the barrel and swung to a different position to grip the plunger when out of the barrel without displacing the fitting from its proper position on the barrel.

9. A clip 'for syringes comprising a pair of resilient arms connected together at one point and provided with a bent integral extension at said point, said bent extension comprising a portion substantially parallel to the axis of the syringe and a portion extending in the general direction of the free end of the resilient arms, and means for pivotally connecting said latter portion to the barrel of' the syringe so as to swing in a plane at right angles to the said barrel, said arms being adapted to grip the plunger and to hold the same with a gentle frictional pressure in different adjusted positions.

l0. clip for syringes comprising a pair of resilient arms, a plurality of spaced projecting elements associated with said arms 'and adapted to establish contact with the surface of the plunger, said arms being connected together at one point and provided with a bent integral extension at said point, said bent extension comprising a portion substantially parallel to the axis of the syringe and a portion extending in the general direction of the free end'of the resilient arms and means for pivotally connecting said latter portion to the barrel lof the syringe so as to swing in a plane at right angles to the said barrel, said arms being adapted to grip the plunger between the above named projections and thereby to hold the plunger with a gentle frictional pressure in difierent adjusted positions.

ALEXANDER MARSCHALEK.

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