US1231497A - Hypodermic syringe. - Google Patents

Description

H. S. COOK.

HY PODERMIC SYRINGE.

APPLICATION FILED OCT. 21, I916- Patented June 26, 1917.

INVENTOR .Harwy ,5. 600% ATTORNEY HARVEY S. COOK, 0F WORTHINGTON, INDIANA.

HYPODERMIC SYRINGE.

Specification of Letters Patent.

Patented June 26, 1917.

Application filed October 21, 1916. Serial No. 126,984.

To all whom it may concern:

Be it known that I, HARVEY S. COOK, a citizen of the United States, residing at Worthington, in the county of Greene and State of Indiana, have invented certain new and useful Improvements in Hypodermic Syringes, of which the following is a specification.

This invention relates to syringes and particnlarly to hypodermic syringes and has for its object to provide a strong, simple and efficient instrument of the kind which will enable a physician to operate more rapidly and withless trouble to himself and to the patient than is possible with instruments for the purpose now in use.

With this as the principal object in view, the invention consists in the novel construction, combination and arrangement of parts hereafter described and pointed out in the appended claims and illustrated in the accompanying drawing, in which:

Figure 1 is a side elevation of the syringe;

Fig. 2 is a vertical longitudinal sectional view of the same;

Fig. 3 is a cross sectional view on the line 33 of Fig. 2, and

Fig. 4 is a similar view on the line 4.--4, Figs. 3 and 4 being shown on a larger scale.

In the drawings, 10 indicates a barrel or cylinder of the syringe, in one end of which and extending substantially one-half the length of the barrel is a chamber 11 for receiving the solution to be injected, the other half of the barrel has a bore 12 extending from the chamber 11 to the opposite end and of slightly less diameter than the chamber. Through the bore 12 slides a plunger 13 of a length sufficient to extend through the bore and into the chamber nearly to its opposite end when wholly depressed. The plunger 13 is cylindrical as shown and of the same diameter from its inner end 14: to its outer end which is provided with a button 15 to be grasped by the fingers for operating the plunger and has a shoulder 16 that forms a stop and abuts against the upper end of the barrel 10. The lower or outer end of the chamber 11 is closed by a cap 17 that fits snugly over the end of the barrel and is locked in place by pins 18 that project radially from the exterior of the barrel and engage slots 19 in the side of the cap, said slots having inclined walls 20 that, bearin against the pins 18 when the cap is rotate to lock said cap on the barrel.

ened on the needle,

Projecting axially from the cap is a threaded stem 21 on which a nut 22 is screwed, said nut serving as a coupling member for securely holding the clamping jaws 23 on the stem 21 and the needle 24 firmly in position. The needle 24 passes through an opening in the stem 21 and the cap 17 and may slide longitudinally therein whenever the nut 22 is unscrewed and the jaws 23 loosened, but as soon as the jaws are tight the latter becomes fixed and rigid with the cap and with the barrel 10.

The needle 24 is hollow as usual and the two ends pointed so that either end may be used for insertion beneath the skin.

syringe constructed as described is quickly filled and easily cleaned owing to the fact that the cap and plunger may both be removed without trouble from the barrel. The plunger frame being cylindrical, being of equal diameter from end to end and without packing affords no means for lodgment of dirt thereon or the retention of the substance in the barrel. The chamber within the barrel is preferably straight from one end to the small shoulder where the bore begins and said bore is of the same diameter throughout its length. The needle is easily removed from the cap to enable the same to be cleaned and the cap being preferably smooth on its inner side ofi'ers no corners for the lodgment of any unsanitary particles.

Preferably the liquid to be injected is carried in a container or ampul 25 made of glass in tubular form open at the ends and of a length to fit within the chamber 11. The ends of the container are closed and sealed by disks 26 of rubber, cork, or other material that is readily perforated by the inner projecting end of the needle 24:. In using the container, the cap 17 of the syringe is removed and the plunger withdrawn into the bore 12 after which the container is inserted in the chamber 11 and the cap 17 replaced, by which means the inner end of the needle punctures the closure 26 and projects into the container. Pressure on the plunger forces the upper closure through the containen and the liquid therein through the needle. By using containers such as described, a great dead of time and trouble is saved as the contents of thecontainers are properly proportioned for injection and they contain the proper amount for an injection.

What I claim is:

1. A syringe comprising a barrel having a straight cylindrical chamber extending thereinto from one end midway its length and a bore of less diameter extending from the chamber through to the opposite end, a cap containing a needle removably secured to the chambered end of the barrel, and a straight cylindrical plunger of uniform diameter fitted to the bore and of a length to extend therethrough and into the chamber when depressed. v

2. A syringe comprising a straight cylindrical barrel having a chamber projecting thereinto at one end and extending midway its length, and a bore of less diameter extending from said chamber to the opposite end of the barrel, a cap movably fitted to the chambered end of the barrel and having projecting jaws, a needle extending through said cap and between the jaws and adapted to be rigidly secured by means of said jaws to the cap, and a straight cylindrical plunger of uniform diameter slidable through said bore and into the chamber.

3. A syringe comprising a barrel having a chamber in one end thereof extending midway its length and a straight cylindrical bore through its opposite end, the bore and .the chamber communicating, a removable one end and extending midway the length thereof, and a bore ofless diameter than the chamber extending from the chamber to the opposite ends of the barrel, a straight cylindrical piston of uniform diameter slidable in said bore and into the chamber, pins projecting laterally from the outer surface of the barrel near the chambered end, a cap having locking slots adapted to fit on said barrel end and engage said pins by means of said slots for locking said cap in position, clamping jaws on the outer end of said cap, a needle passing through a perforation in the cap and between said jaws, and clamping means for operating the jaws to grip the needle.

5. A syringe comprising a barrel having a straight chamber in one end thereof extending midway its length and a straight cylindrical bore through its opposite end, the bore and the chamber communicating, a removable needle secured to the chambered end of the barrel, a plunger of uniform diameter mounted in the bore and adapted to be pressed into the chamber, and a removable container for the fluid to be injected of a size capable of being inserted in the chanr bered end of the syringe and having perforatable closures at its ends movable longitudinally in the container.

In testimony whereof I afliX my signature in presence of a witness.

HARVEY S. COOK.

Witness:

W. H. FLATER.

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