US1606034A

US1606034A - of chicago

Info

Publication number: US1606034A
Authority: US
Publication date: 1926-11-09
Anticipated expiration: 1943-11-09

Description

Nov. 9 1926.

J. MaGGREGOR HYPODERMIC SYRINGE Filed Sept. 15. 1924 fla/@127i kfoin /ac G'fgoz? Patented Nov. 9, 1926.

UNITED .STATES PATENT"A oFFlcE.

JOHN MACGREGOR, F CHICAGO, ILLINOIS, ASSIGNOR 'IOl COOK LABORATORIES, INC.,

OF CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE. 'I

HYPoDRMIe sYnINen.

Application led September 15, 1924. Serial No. 737,636.

This invention relates to hypodermic syringes of the type employing a medicament-dispensing cartridge as the medicament container, and among other objects aims to provide a Syringe exceptionally easy to fill with such a cartridge.

The invention may be understood by reference to one illustrative embodiment shown in the accompanying drawings, in

which:

Fig. 1 is an elevation of the syringe;

Fig. 2 is an enlarged longitudinal cross section thereof; and

Fig. 3 is an elevation of the principal parts of the syringe shown open for filling.

It is to be understood that the illustrative form shown in the-drawings is simply a preterred embodiment of the invention; and that in the following explanation of that specific form, the described details of structure and organization are merely exemplary.

rIhe syringe shown comprises 'a skeleton barrel or body 5 to which a tubular cartridge carrier member 6 is swingably connected in. termediate its length by rivets 7. When the barrel is closed, as shown in `Fig. l, the carrier member is axially alined with the barrel, and its ends lie adjacent the

barrel heads

8 and 9. The barrel head 8 supports the hypodermic needle 10, while the barrel head 9V slidably receives the syringe plunger rod 11 which contracts the interior volume of the cartridge 12 to dispense its contents through the needle. To lill the syringe, the carrier 6 is swung on its pivots, as shown in Fig. 3, thus presenting eitheir of its ends in convenientl position for insertion of a fresh cartridge.

To hold the barrel closed, the barrel head 9 carries a lock 13 in the form of a slidable, hollow sleeve, normally projected outwardly from the barrel head by a spring 14. The lock is designed to ft in one end of the pivoted cartridge carrier to keep it alined with the plunger, so that the inner enlarged end 15 of the plunger rod may push the slidable plug 16 of the cartridge to inject the medicament, AS shown, the plunger end 15 engages with a recess 17 in the sleeve lock, permitting disengagement of the lock by an outward pull on the plunger rod. When the cartridge is 'within the locked carrier, the outer edge of the Sleeve lock presses the cartridge resiliently toward the needle (Fig. 2), thus preventing an objectionable lo'oseness of assembled parts, as will be explained below.

In the construction shown, the carriery is pivoted midway its-ends and midway the

barrel heads

8, 9 so that the carrier may be swung in either direction in opening or closing the syringe. As best shown in Fig. 3, the end edges of lthe tube which forms the carrier may be out away on opposite sides as at 18, so that when the carrier is moved toward closed position, its cut-away edge cams the sleeve lock, which yields to the carrier. Such a construction permits the syringe to be snapped shut without manipulatingA the lock.

Before using the syringe, the carrier 6 is unlocked and swung' outwardly, as shown in Fig. 3, and the cartridge is inserted in either end. Then the `carrier is moved into longitudinal alinement with the barrel, whereupon the lock automatically Snaps shut, as described. Lastly, the cartridge plug 19 is pierced by a longitudinal thrust of the needle, which then provides a medicament conduit leading from the interior of the cartridge to the point of injection. The syringe is `now ready for service,

When the syringe is used, the plunger 11. pushes the slidable plug 16 through the cartridge, ejecting the medicament through the fine bore of needle 10; Due to the large ratio of the diameter of the slidable plug to the bore of the needle, a small movement of the former causes a rapid flow through the latter, whose iow capacityis very 1imited; and the resultant fluid pressure within the cartridge is sutlicient to tend to eject plug 19, which would cause loss of the medicament and fouling of the syringe. In the arrangement shown, the sprmg-pressed latch 13 presses the cartridge rmly against the syringe head 8, thus adding the re sistance of the spring 14 to the frictional grip of plug 19 withln its tube; and these two resistances are usually sullicient to prevent positively any outward movement of plug 19.

Obviously the present invention is not restrieted to the particular embodiment thereof herein shown and described. Neither is it indispensable that all the features of the invention be used conjointly; they may be combination, a skeleton barrel; a cartridge holder pivoted intermediate its ends to an intermediate point of said barrel and open at one end for insertion of the cartridge; and means for locking the cartridge holder tothe barrel when coaxial therewith.

2. A hypodermic syringe comprising, in combination, a supporting body; a cartridgeenclosing member pivoted to the body to swingv about a transverse axis between its ends,botl1 of which are open for insertion of the cartridge, and a latch serving to lock the cartridge-enclosing member in axial alinement with the body. f.

3. A hypodermic syringe comprising, in combination, a body; and a cartridge carrying member pivoted to the body and open at one end for ready insertion or removal of the cartridge; the parts being so constructed and arranged that the carrying member may be swung or rotated on its pivots but is otherwise immovable relative to the body.

4. A hypodermic syringe comprising, in combination, a bod and a cartridge carryingmember pivote to the body and open at vone end for ready insertion or removal of the cartridge; and a spring latch carrid by the body orlocking the cartridge-enclosing member in a position permitting dispensing of the medicament therefrom.

5. A hypo'dermic`syringe comprising, in combination, a skeleton barrel; a cartridge holder pivoted intermediate its ends to said barrel and constructed and arranged to enclose a cartridge placed therein; a plunger slidable through one end of the barrel to dispense medicament from the cartridge; an a latch for holding together the barrel and cartrid e holder, said latch being released by pu ing on the plunger.

6. A hypodermic syringe comprising, in combination, a skeleton barrel; a cartridge holder carried by the barrel and constructed and arranged to permit insertion of a cartridge therein from one end; and a spring latch carried by the barrel and fitting into one end of the cartrid e holder; the parts being so constructed an arranged that when the cartridge is in the holder and the latch is engaged, the cartridge is pressed against the other end of the barrel by. thespring latch.

7. A hypodermic syringe comprising, in combination, a barrel; a cartridge holder carried by the barrel; the barrel and cartridge holder being relatively movable to permit insertion of a cartridge from either en'd of the holder; and a plunger carried by the barrel for dispensing medicament from the cartridge.

8. A hypodermic syringe comprising, in combination, a rigid, skeleton barrel having heads at opposite ends; a` cartridge holder, tubular in form, pivoted at an intermediate point to the barrel and swingable outwardly therefrom :tor insertion of a cartridge; a hypodermic needle; means securing said needle to one of the barrel heads to extend therethrough in position to pierce one end of the cartridge; a latch-carried by the oppo-site barrel head and constructed and arranged to engage the cartridge holder to retain it coaxial with the barrel; and a medicament-dispensing plunger slidable through said opposite head. v

9. A hypodermic syringe comprising, in combination, a rigid skeleton barrel having heads at opposite ends; and a tubular, openended cartridge holder pivoted intermediate its ends to the skeleton barrel and tting within fthe barrel when swung into axial alinement and presenting either end for lling with a cartridge when swung out of alinement with the barrel.

10. A hypodermic syringe comprising, in combination, a skeleton barrel; a tubular cartridge holder pivoted midway its ends to said barrel; a spring lock carried by the barrel and constructed and arranged to engage with either end of the cartridge holdenwhen co-axial with the barrel; the end edges of said cartridge holder being cut away so .that when either end is swung toward the lock from either direction, the edge of the holder cams the lock which snaps ahut automatically.

11. A hypodermic syringe comprising, in combination, a rigid skeleton barrel includinghea'ds at opposite ends and tie members connecting the heads; a tubular cartridgeenclosing member pivoted between the tie members at a point midway between the ends thereof and of the tie members, and freely swingable but otherwise immovable relative vto the barrel; a manually operable latch carried by one of the syringe heads and projectable across the joint between said head and an end of the cartridge-enclosing member so as to extend a short distance within said member; a medicament-dispensing cartridge held in place by said latch; and means on the other lsyringe head for-supporting a needle in cartridge-piercing position.

12. A hypodermic syringe comprising, in combination, a rigid skeleton barrel including heads at opposite ends and tie members connecting the eads; a tubular cartridgeenclosing member pivoted between the tie members at a point midway between the ends thereof and of the tie members, and freely swingable but otherwise immovable relative tothe barrel; a spring pressed sleeve lock Carried by one of the syringe lock so as to Withdraw the lock from the heads and projected by the spring across the cartridge-enelosingA member when pulled joint between said head and an end of the outwardly. 10 cartridge-enclosing member so as to extend In testimony whereof, I'have. signed my 5 a short distance Within the member; a inediname to this specification.

cament dispensing plunge-r reciprocable through said head and engaging the sleeve JOH MACGREGOR.