US1718591A

US1718591A - Hypodermic syringe

Info

Publication number: US1718591A
Application number: US168293A
Authority: US
Inventors: Arthur E Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-02-15
Filing date: 1927-02-15
Publication date: 1929-06-25
Anticipated expiration: 1946-06-25

Description

June 25, 1929. A, SMITH 1,718,591

HYPODERMIC SYRINGE Filed Feb. 15, 1927 L 1 N VEN TOR. ARTHUR E. SMITH.

BY WMw- N A TTORNEY.

Patented June 25, 1929.

UNITED STATES ARTHUR E. SMITH, OF LOS ANGELES, CALIFORNIA.

HYPODERMIC SYRINGE.

Application filed February 15, 1927. Serial No. 168,293. 7

This invention relates to hypodermic syringes.

The general object of my invention s to provide an improved hypodermic syrlnge which is adapted to receive an ampule tor injection of drugs in the ampule.

A further object of my invention 1s to pro vide a syringe having novelmeans for removably holding an ampule therein.

A specific object of my invention is to provide means for readilyforming a fluid tlght joint between the syringe and the ampule.

Still another object is to provide a syringe having novel means for automatically center? ing an ampule placed in the syringe.

Further objects and advantages of the in vention will be apparent from the following description taken in connection with the ac (:ompanying drawings wherein:

Fig. 1 is an enlarged central verticalsectlon 01 my improved syringe.

Fig. 2 is a detail sectional view of an ampule which may be used in conjunction with my syringe.

Fig. 3 is a section of the syringe taken on line 3-3 of Fig. 1. V i

Fig. i is an enlarged vertical section of a portion of the barrel of the syrlnge showing the centralizing ampule holding fingers.

Fig. 5 is a detail side elevation of the plunger and telescoping mechanism used 1n the syringe, and

Fig. 6 is a sectional view partly in elevation of a modified form of syringe. p 7

In the accompanying drawings I have indicated my improved syringe generally at 10.

v This syringe is particularlydesigned tor use with an ampule 11, shown in detail in F1g. 2.

The ampule comprises a body 12 having a tapered end portion 13 which is closed and terminates in a breakable tip 14. The tip 14 may be rendered readily separable from the ampule by scoring, notching, etchlng, or

otherwise weakening it as indicated at 15.

The open end of the ampule is closed by a stopper. 16 which is preferably of rubberand which fits the ampule tightly, enabling it to act as a piston to expel the contents of the ampule through the tapered end portion 13 i after the tip 1 1 has been broken therefrom as hereinafter described. The ampule is preferably of a size to hold the amount of a drug necessary for one injection.

The syringe 10 comprises a body or barrel 18 having a cross bar 19 for engagement by the fingers of an operator. The barrel 18 is also provided with a plurality of spaced apertures 20 and a plurality of spaced spring fingers 21. These spring lingers may be formed by slitting the metal of the barrel 18 and pressing the released portions inwardly. The spring members may, however, if desired, be

separate pieces of material secured to the barrel 18 of the syringe in any suitable manner.

The upper end of the barrel of the syringe is threaded as at 22 for detachably securing to the syringe body a cap 23 (see Fig. 5) which is likewise threaded.

The cap 23 includes a plunger mechanism 24c tor engaging the stopper 16 and moving it. The plunger includes a plurality of telescopic

tubular members

25, 26, and 27, which may be multiplied in number to any desired extent. A. spring 28 is located within these tubular telescopic members and bears between the upper portion of the cap 23 and the upper portion of the lower or innermost telescopic member 27. The lower telescopic member 27 is provided with a head 29, which comprises a tapered rubber washer 30 disposed between a metal ring 31 and a tapered metal tip 32.

The plunger 24 comprises a rod 33 which is fitted within the spring 28 and has a cross bar or handle 34; upon its end. This handle 34 is adapted to be engaged by the palm of an operators hand. At the lower end of the rod 33 a head 35 is provided for engaging the stopper 16. y

The lower end of the syringe body 18 is externally threaded for detachably securing thereto a hub 36 of a hypodermic needle 37. The hub 36 is provided with a conical recess 38, which is adapted to receive a correspondingly shaped cone 39. The cone 39 is compressible and is preferably made of rubber and is provided with a conical recess 40 into which the broken end of the ampule 11 fits when the ampule is insertedin the syringe. The needle 37 is permanently secured to the hub 36 by soldering or in any other suitable "manner. One end of this needle 37 is adapted to extend up into the reduced portion 13 of the ampule 11 as at 42 and the other end may be beveled to form a point as at 43.

When it is desired to use my improved syringe for making an injection the cap 23 is removed from the body 18 and anampule 11 is inserted into the body of the syringe, the tip 14 oi the ampule having been previously removed. As the ampule is moved down- I neck of the ampule engages the bead 57.

wardly in the syringe the spring fingers 21 will center it 'causingthe tapered end to pass into the conicalrecess of the rubber cone 39.

After the ampule has been placed in the syringe the cap 22 is again secured to the body of the syringe. As the cap is being placed in position the head 29 on the lower telescopic member 27 abuts the upper end of the ampule and the conical shape of this head 29 causes the ampule to be correctly centered. The op erator then grasps the cross bars 19 with his fingers and places the handle 34 in the palm of his hand/ The handle 34 is thenmoved towards the'cross bars 19 to cause the head 35 to engage the stopper 16 of the ampule 11. On a further movement of the plunger rod the head 35will force the stopper 16 toward the restricted portion 13 and thus the contents of the ampule will be forced into and through the hypodermic needle 37.

As pressure is applied on the plunger head 35 to move the stopper downward the end of the ampule which is broken will be forced into very tight engagement with the rubber cone 39, thus creating a fluid tight seal between the broken end of the ampule and the rubber cone.

Since the head 29 is rendered yieldable by reason of its-telescopic mounting and the presence of the spring 28, it follows that it may be positioned at varying points in the length of the body of the syringe, and still perform its function. By virtue of this arrangement the one syringe is adapted to handle ampules of varying lengths and consequently of varying cubic capacities.

By providing the apertures 20 in the body 18of the syringe, sight openings are formed through which the'contents of the ampule will be visibleand so that the movement of the stopper 16 and the extent to which the con- 1 tents of the ampule have been discharged may be readily observed by the operator of the 1 syringe.

. In Fig. 6 I have shown a syringe provided with a modified form of plunger 51 and cap 52. The syringe 50 is similar in construction to the syringe 10 shown in Fig. 1,

having a hollow tubular barrel 53 wherein equally spaced elongated apertures 54 are provided and wherein ampule holding and centerin g spring fingers 55 are also provided. 7 A

tip 56 detachably engages the lower end of the barrel 53- and is provided with a rubber cone 57 which has a bead 57 thereon. The

A hypodermic needle 58is detachably secured to the lower portionof the tip 56.

The plunger mechanism 51 comprises a plunger rod 59having a head 60 at one end and a handle or knob 61 at the opposite end. The plunger rod 59 is slidably mounted in the cap 52 which removably engages the upper portion of the barrel 53 by means of screw threads 62 and has a reduced lower end portion 63 adapted to guide the plunger rod 59.

The ampule 11 shown in Fig. 2 is also shown in this modified form of syringe and the plunger head 60 is adapted to enga e and actuate the rubber stopper 16 to disc liarge the contents of the ampule as previously described in connection with syringe 10.

From the foregoing description it will be apparent that I have provided an improved form of syringe wherein novel means is provided for centering and holding an ampule, and wherein means is provided for forming a fluid tight joint between the ampule and the syringe and wherein an improved plunger means is provided for discharging the contents of an ampule.

\Vhat I claim is:

1. A syringe of the character described comprising a barrel, a cap on said barrel, a plunger rod, :1 spring surrounding said plunger rod, a handle for operating said plunger rod, a plurality of telescopic elements surrounding said plunger rod, said spring engaging said cap and the lowermost of said telescopic elements, a head on said lowermost telescopic element ada )ted to engage the end of an ampule said head being tapered to center said ampule.

2. A syringe of the character described comprising a barrel, a plunger rod, a spring surrounding said plunger rod, a handle for operating said plunger rod, a removable cap on said barrel, a plurality of telescopic elements surrounding said plun er rod, said spring engaging said cap and t e lowermost of said telescopic elements, a bead carried by said lowermost telescopic element and ads pted to engage the end of said ampule, said head being adapted to center said ampule, and means on said barrel for holding and centering said ampule independently of the head on said telescopic element.

3. A syrin e of the character described comprising a barrel, a plunger rod, in. spring surrounding said plunger rod, a handle for operating said plunger rod, a removable ca on said previously mentioned body, a plura ity of telescopic elements surrounding said plunger rod, said spring bearingbetween said cap and the lowermost of said telescopic elements, and a head carried by said lowermost telescopic element adapted to engage therear end of said ampule, said head being adapted to centralize said ampule, and means on said body for holding and centralizing said ampule independently of said head on said telescopic element.

4. A syringe of the character described comprising a barrel, :1 ca on said barrel, a plunger rod, a handle or operating said plunger rod, a plurality of telescopic elements surrounding said plunger rod, means for urging said cap and the lowermost of said telescopic elements apart, a head on said lowermost telescopic element adapted to engage the end of an ampule, said head including means to center said ampule.

5. A syringe including a barrel and a plunger movable in said barrel, an ampule in said barrel, and resilient means peripherally spaced about said barrel and engaging said ampule intermediate its ends for centering the ampule in the barrel.

6. A syringe including a barrel, a closure for said barrel, a removable ampule in said barrel, a plunger in said barrel, means engaging the end of said ampule to hold it in the barrel and laterally movable spring pressed means independent of said first means and engaging the outer Wall of said ampule at spaced points thereon to center said ampule in the barrel.

7. A syringe of the character described comprising a barrel adapted to receive an am- 4 pule, a plunger movable in said barrel, a handle for operat ng sa1d plunger, centering means including a member having a Wall 1nclined in respect to the axis of an ampule in the barrel and projecting into said barrel and adapted to engage and enter the inner end portion of an ampule arranged in said barrel to center it.

8. A syringe of the character described comprising a barrel, a cap for said barrel, means for normally retaining said cap in engagement with said barrel, a plunger movable into said barrel through said cap, an ampule in said barrel, a centering member, said ampule having an open end, said centering member including a portion larger than the end of said ampule and a portion smaller than the end of said ampule and adapted to engage Within an ampule arranged in said barrel to center the ampule, said centering member being movable into said ampule.

In testimony whereof, I hereunto affix my signature.

ARTHUR E. SMITH.