US2541621A - Hypodermic syringe - Google Patents

Description

Feb. 13, 1951 F. THOMPSON HYPODERMIC SYRINGE Filed Oct. 14, 1947 F. THOMPSON LOUIS Gttorueg Patented Feb. 13, 1951 UNITED, PAT E'NT OFFICE Heroesi S i NQ Louis F; Thompson, I tiverside, Calif. aprefinopidbsi st el m- 1 8 barrel andpushedin substantially-as far as it'w'ill go, bearing in'mindthe tablet which has'been deposited in said barrel. Thereafterthe' barrel is charged in the usual'ma'nner with a' suitable fluid such as distilled, water, by pullingthe plunger outwardly. As it is necessary, when' thuspreparing the device; for use; m nnows-op n plunger 'endupwardly, the tablet,- whendropp'ed into the barrel; immediately d-rops'to -the opDQSite' en'd'thereof 'whereat the'needle is located-,- and inasmuchas the interior of the barreYis'da-mp' from sterilizing. the barrel point and-needle-often become clogged with-pai-ticles of the tablet-so that the syringe cannot-'be used withoutfirs't' cleaning;

the barrel point and needle, and bftenthe needle cannot be cleanedand must be replaced. Further, in many cases, the barrel point and needle become cloggedimmediately when the tablet is dropped into the barrel and under such circumstances it is impossible to pushfltheplunger intov said barrel.

Cleaning of the needle and barrel point under such conditions consumes-valuable time, and a portion of the medicine; maybeilost. Moreover, such plugging. of. the..need1e;and barrI point may. be very. serious .in emergency; cases whereian immediate hypodermic injection is required.

It is therefore an object of the invention to provide a hypodermic syringe which will overcome the above difiiculties.

Another difficulty encountered in using hypodermic syringes is the seepage or blow-by past the plunger so that some of the medicine may drip from the syringe and be lost. Further, some medicines are of such character as to stain the clothing upon which it may drop. Such seepage often occurs when making an injection into hard muscles.

It is therefore another object of the invention to provide a device of this character which will prevent medicine .dripping from the instrument and which will collect such medicine so that it may be saved if desired. In the case of certain.

Z -GIainis. (01. 128-218) 2 medicines ,which are very expensive, this saving may be veryfimportant. Such saving may also be important in cases of medicines which require a prescription and are "dispensed in limited amounts to the users.

' It is a further object of-the invention to provide a device ofthis character which may be provided' with a medicinal tablet prior to'its use. Thisis of"partic' ular advantage in clinical use wherein it is'desirable tohavea number of hypodermic syringes at the doctors hand so that he will not losea lot of 'timein giving hypodermic injections'to a group of-patients.

Further objects and advantages of the invention-willapp'earirointhe following-part of the specification. i

"Referring 'to the drawings, which are 'for illustrative-purposesonly,

Fig;- 1 is a-plan view oi-a hypodermic syringeembodying the presentinvention;

Fig. 21s a side view thereof partially in section;

Fig. 3 is an enlarged'sectional view taken on line33 of 2;

' Fig.4 is. a fragmentary sectional view taken on line 4 4 of Fig. 3; and

Fig. 5 is a partial section taken on line 55 of Fisk-2"? Referring more particularly to the drawing, the hypodermic syringes comprises a hollow cylindrical b'arrel," indicated-generally at H]. One end o'fithe 'barrel'is 'open for 'reception of a plunger ori'pistonfl'l, which is] slidable in said barrel. The opposite end 'ofthe barrel is provided with a-reduced diameter portion or barrel point l2 forrecieption ofthe bowl'itof a needle [4. The barrel point IZthas a passage l5 through which fluid'from the "barrel interior it flows on its way to. the,;needlewhen the plunger II is moved inwardly ofthe' barrel.

The barrel may be of any suitable material, such as glass, and on the exterior thereof there may be provided one or more scales to indicate the quantity of fluid within the interior chamber It. As shown, there is a minim scale M and a CC scale circumferentially spaced therefrom. The plunger H may also be of glass or any other suitable material, while the needle is formed. of metal.

Adjacent the open or plunger end of the barrel there is a flange I! having oppositely disposed substantially parallel flat sides [8. The flat sides l8 prevent the device from rolling on a flat surface or the like, and at right angles to the planes of said flattened sides l8 there is pro,

vided a laterally extending boss or cup, indicated generally at 19, having a hollow cup-like interior 2! which is generally concave. The interior of the cup has a slightly constricted opening 21 which permits the deposit of a medicinal tablet in said interior 20. The interior 20 of the cup communicates with the interior chamber 16 of the barrel by way of an opening 22 which is bf smaller diameter than themaximum diameter of said interior 20. located intermediate the flanged end I! of the barrel and the adjacent or inner ends of the scales M and CC. It is to be noted that the cup is is located a sufficient distance from the above mentioned scales so that when the plunger is pulled outwardly, the syringe may be filled at least up to the inner ends of said scales before the vacuum or suction within the barrel is broken by the opening 22. Further, the cup i9 is spaced inwardly from the flanged end of the barrel so that the plunger may be drawn past the opening 22 without danger of its becoming separated from the barrel.

In using the present device it is held at an inclination with the needle end highest and a medicinal tablet is placed in the cup I9, it being understood that the plunger is then at a position whereat the inner end thereof is behind the ope i g 22 so that said tablet will drop through said opening and against said inner plunger end. The plunger is then pushed inwardly an initial distance. Due to the inclination at which the device is held when the tablet is deposited it will not, drop toward the needle end of the chamber l6, and if it does dissolve the action will occur on the plunger end without danger of clog-- ging the barrel point I or the needle 14. The needle 14 is then immersed in a liquid, such as distilled water or the like, and the plunger pulled outwardly a sufiicient distance to draw into the chamber It the desired quantity of liquid. The device is then ready to make a hypodermic injection which may then be readily effected. It is to be understood, of course, that when preparing the hypodermic for use, the open end 2| of the cup i9 is maintained uppermost.

Should the hypodermic syringe be somewhat worn so that there would be seepage or blow-by between the exterior of the plunger H and the interior wall of the barrel, the seeping liquid will enter the interior of the cup l9 andbe retained therein, thus preventing such liquid from passing out of the barrel at the plunger end and dropping on clothing which might be stained. Moreover, this medicated liquid in the cup may be placed in a vial or other receptacle, and saved. This may be an important matter when using expensive medicines, or medicines that are dispensed in limited quantities.

The boss or cup [9 is When the instrument is placed on a table or the like, it is so disposed that it will rest on the flat side [8 which is opposite the cup l9. The cup is therefore disposed in an upright posi tion so that a medicinal tablet may be dropped therein.

For clinical use, where a number of hypodermic syringes are arranged for use in more or less rapid succession, a plurality of these devices may be arranged with the cups upright and each containing a medicinal tablet. Therefore, the doctor may take each syringe up in its proper sequence and quickly prepare it for use without danger of having the tablet drop from the cup and be contaminated or even lost. It is to be understood that the cup arrangement does not interfere with the use in the present hypodermic device of medicines in solution.

I claim:

1. In a hypodermic syringe: a barrel having acylindrical interior chamber with an outlet opening at one end and a plunger opening at its opposite end; an outwardly extending flange adjacent the end of the barrel having'the plunger opening, said flange having a flat side; a hollow boss extending laterally of the barrel on the side opposite the flattened side of the flange, the interior of saidboss being enlarged and having an opening for reception of a medicinal tablet, the interior of said boss communicating with the interior chamber of the barrel by way of an opening Sufiiciently large for the passage of said tablet" into said barrel; and a plunger slidably received in said barrel.

2. In a hypodermic syringe: a hollow cylindrical barrel having an outlet opening in one end and a plunger opening in the opposite end; an opening in the side of the barrel intermediate said ends, said opening being sufficiently large for the passage therethrough of a medicinal tablet or the like; wall means extending about the opening and forming a shallow cup having an opening therein of sufi'icient size to receive said medicinal tablet therethrough, the interior of the cup being of greater cross-sectional area than said openings; and a plunger slidable in said barrel.

, LOUIS F. THOMPSON.

REFERENCES CITED The following references are of record in the :file of this patent:

UNITED STATES PATENTS Number Name Date 1,456,469 Schwidetsky May 22, 1923 1,496,126 Livingstone June 3, 1924 1,539,637 Bronner May 26, 1925

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