US1803316A - Hypodermic syringe - Google Patents

Description

May 5, 1931. H. K. BROWN HYPODERMIC SYRINGE Filed Dec. 16. 1927 Patented May` 5, 1931 Y ire STATES PATENT ori-nice HENRY K. BROWN, OF CHICAGO, ILLINOIS, .ASSIGNOR TO COOK LABORATORIES, ING.,

OF CHICAGO, ILLINOIS, A. CORPORATION OF DELATTARE HYPODERMIC SYRINGE Application mea December 1e, leer.. seriali No. 240,386.

This invention relates to hypodermic syringes of the kind comprising a cartridge Vand cartridge-piercing canula or needle in the annexed drawings, and will be more particularly pointed out ,in the claims following this description.

In said drawings:

Fig. 1 is a longitudinal sectional view of a syringe comprising or containing the illustrativeY embodiment of the invention;

Fig. 2 is a side elevation of the cartridge embodied in said syringe, the front portion of the cartridge being shown in section;

F ig. 3 is an enlarged sectional Aview of a pierceable stopper in the fore end of said cartridge; and n Fig. 4 is a rear end'view of said cartridge.

The cartridge embodied in the illustrative syringe comprises a glass tube 1 sealed at its ends by stoppers 2 and 3 and containing anaesthetic solution or other medicament to be dispensed. The stoppers are preferably` of resilient material such as soft rubber or oth'- er suitable material or composition. The stopper 2 is to be'pierced by a fine canula or hollow needle and to seal around the same, and the stopper 3 is to be pushed inward to expel the fluid through the needle. To secure the stopper 2 in the tube so as to resist relative displacement in the cartridge-piercing or fluid-ejecting operations, said stopper is mechanically interlocked with the tube by an annular rib on one of them engaging an annular groove in the other. i stance the tube is shown beaded at 4 to provide a groovel engaging theannular projection 5 on the stopper 2, whereby the desired interlocking is obtained. As shown, the stopper protrudes substantially beyond the fore end of the glass tube to provide a cushion. By forming the stopper with the inwardly facing axial cavity 6, the advantage is obtained that the inner tubular end of the stopper is readilyv compressed and facilitates the compression of the immediately adjacent portion of the stopper when forcibly insert- In this iningit'into the tube soas to seal the-rib 5 in Y the groove provided-by the bead4. On the other hand, in the fluid-ejecting action the hydrostatic l pressure acting on the annular wall surrounding said recess presses said wall more forcibly against the interior of theftube, tending totighten-the hold of the stopperand Aresisting displacement.

The syringe or injectlon-administeringorganization showny in Fig.l 1 comprises said cartridge with meansembodied in this Vinstance in a syringe-like instrument. vReferring to said F ig. 1,'the cartridge is mountedfin vthe holder or tubular-like instrument! body 7 with the fore end of the cartridge seated against the inner side of the head 8, f

and with the rubberstopper 2 impaled upon. and forming a' resilient seal around the inwardly-protruding end of the double-pointed needle 9. In operation, the plunger rod @10 is forced into the cartridge-tube, drawing the piston plug 3 inwardly and forcibly expelling the medicament solution through the needle.

InA this action, the'mechanical interlockbetween the stopper 2 and the tube resists tend'-v ency to relative displacement while the protrusion ofthe stopper beyond' the end Of the glass tube cushions it against end thrust. The resiliency of the compressed stopper and the hydrostatic pressure action on the interior ofthe tubular part of the .stopper contribute' with themechanical interlock in the maintenanceof a good seal. v Y p In' the particular instrument selected for illustration, the head 8 is detachable, being ecy screwed upon the front end of the instrument shown fitted in the breech end of the cartridge holder orvinstrumentA barrel, the cartridge being clamped between said gasket and the n, in!

vgroove and thereby mechanically interlocked with the tube, the stopper protrudingsubstantially beyond the end of said tube to provide a cushioning means.

2. A syringe cartridge comprising a straight glass tube beaded near its fore end, having a sealing stopper of resilient material iitted in the said beaded fore end and adapted to be pierced by a needle, and having a piston plug in its opposite end adapted u to be pushed into or through the tube to eject the liquid contents through the needle, said pierceable stopper shaped to iit the bead of the tube, being otherwise cylindrical and of substantially uniform diameter and having cylindrical portions iitted in the tube both behind and in front of the bead of the tube, and the cylindrical portion of said stopper in front of the bead projecting substantially beyond the fore end of the tube to provide a cushioning means.

3. A syringe cartridge comprising a sealed medicament container having a closure to be pierced by and seal around a needle and constructed to have the interior volume of the cartridge reduced for ej ecting the fluid contentsA through the needle, said cartridge embodying a substantially straight glass tube formed near its fore end with an annular bead providing an interior annular groove and said sealing closure comprising a cylindrical stopper of resilient material formed intermediate its ends with an annular rib engaging said groove, whereby the stopper is interlocled with the tube to resist relative displacement in either direction between the tube and stopper during the luid-ejecting operation. y

In testimony whereof, I have signed my name to this speciication.

HENRY K. BROWN.

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