US1767304A - Injection apparatus - Google Patents

Description

June 24, 1930. H. s. MORTON INJECTION APPARATUS Filed Dec. :50. 1927 Patented June 24, 1930 UNITED "STATES HENRY S. MORTON, FOREST GLEN, MARYLAND INJECTION APPARATUS Application filed December 30, 1927. Serial No. 243,568.

This invention relates to injection apparatus and has for its object the provision of an ampul in which the injectin needle is hermetically enclosed within the uidchamtiv ber of the ampul.

A more specific object of the invention is the provision of an ampul in which the needle is arranged between the end closures of the ampul, one of which functions as a plunger, the needle and the respective closures being so constructed that both closures are penetrable by the needle when one of the closures is moved inwardly of the ampul, but with a different degree of penetrability, so that the working or injecting end of the needle penetrates its closure, before the opposite end of the needle penetrates the closures with which it cooperates. y Other objects of the invention will appear as the following description of a preferred embodiment thereof proceeds.

In the drawings: I vFigure 1 is a longitudinal view partly in section, showing the ampul of the invention associated with the injecting means.

Figure 2 is a similar view showing the needle in its projected position relative to the ,am'pul, and the closure which functions as a plunger of the needle.

Figure 3 is asection taken along the line 3-3 of Figure 2.

Figure 4 is a section taken alongzthe line 44 of Figure 2.

Figure 5 is a longitudinal view partly in section, showinga, modified form of needle.

Referring now in detail to the several Figures, the numeral 1 represents a tubular penetrated by the opposite end able material.

a short distance within the end, of the tubu-' .lar body as shown, so that the extending portion of said-body may-act as a guide for suitable plunger operating means, such as the shows body which may be of glass or anyother suit-- element 4, which in this case is represented as a giass tube, for instance an ordinary test tu e. It is. to be understood that the invention primarily is concerned with the ampul alone and that any suitable form of injecting apparatus may be used in conjunction there with. The present illustrated embodiment inexpen sive injecting apparatus which, with the ampul and needle, maybe an thrown away after once using the ampul.-

Arranged longitudinally within the fluid chamberof the ampul with its opposite ends resting against, or slightly penetrating the respective closures, is the needle 5, which consists essentially of a forward or working end which is provided with a bore in the usual manner, and which communicates intermediatelywith the chamber of the ampul I by means of a passage 9. That portion of the needle rearwardly of said passage may be closed in any suitable manner, being here shown as stopped at its rearward end by a suitable sealing substance 11 such'as parafiin.

The opposite ends of the needle are of differ-. ent degrees of acuteness, so that when pressure is transmitted from the rearward closure 3 through the needle to the forward trates the rearward closure. A stop 8 is provided on the needle at an intermediate point, and limits the extent of protrusion of the I needle, by abutting against the inner face 95 of the forward closure 2. In Figure 1 this stop has the form. of a washer which is forced upon the forward end of the needle and abuts against a lug 10. The latter may i be struck up in the operation of forming the passage 9. 1

In the operation of the device, the ampul is placed within a suitable holder 14 having fingerpieces 15. Pressure is then exerted upon the plunger operating member 4, said pressure being transmitted through the needle against the forward closure and causing the working end of the needle to penetrate said "closure and to extend there through for a predetermined distance, that is to say until the washer 8 abuts against the closure 2. The forward movement of the needle will thus be stopped, and further pressure upon the plunger operating member 4 will cause the rearward end of the needle, which is preferably chamfered or otherwise rendered somewhat sharp, to penetrate the rearward closure in a fluidtight manner so that said closure may be forced down through the extent of the fluid chamber of the ampul. The liquid in the ampul is discharged through the passage 9, and through the working end of the needle.

It is obvious that the ampul should not be completely filled with liquid but that sufficient air space will be reserved therein to permit the compressability of the contents of the ampul necessary to allow the needle to penetrate the forward closure. When penetration has once been effected, the air in said ampul may at once be discharged through the needle. The body of'air in the ampul should be sufficient to fill it from the position of the washer as shown in Figure 1, to the'forward closure. If the amount of liquid in the ampul is slightly in excess of the quantity necessary to provide this air space, the excess of liquid will be discharged until the washer 8 reaches its position in abutment against the closure 2. It is of course recommended that in the initial operation of the injecting apparatus, the working end thereof shall be held uppermost, in order to insure discharge of the air before the liquid begins to discharge.

Inorder to hold the needle in place while filling the ampul, it may be desirable to surround the rearward end of the needle with suitable allocating means such asthe spidershaped washer 13, which need be but a loose fit within the tubular body and is provided solely for the purpose of keeping the rear-v ward end of the needle in position tobe properly engaged by the rearward closure in putting the latter in place. The washer is made spider-shaped so as to afford spaces through which the ampul may be filled.

An inexpensive and practical form of needle is shown in Figure 5 in which a tubular wire forms the lower or working end of the needle, said wire being an larly bent as indicated at 16 in order to a ord a stop, equivalent to the washer 8 shown .in that form. of the invention illustrated in Figures 1 and 2. The angular portion of the wire is open, and affords communication between the fluid chamber of the ampul and the working point ofthe needle. A rod 17 is welded or otherwise fixed to the wire 16 at the bend or elbow of the angularly disposed portion, that is to say substantially in axial alignment with the 'worln'ng end of the needle. The free end of this rod is constructed so as to enable it to penetrate the rearward closure, but as in the former case,

it is not quite as acute as the working point of the needle, so as to assure that the forwardclosure of the ampul will be penetrated prior to the rearward closure.

It is obvious that an ampul constructed according to the principles of thepresent invention is not only adapted for use with injecting apparatus-which is designed to be cast awayafter-once using, but that it may be used in any ampul receiving syringe, the only modification necessary being that the plunger rod would have to be hollow to receive the extended rearward end of the needle. I

.While I have in the above description defined what is the preferred embodiment of the present invention, it is to be understood that the specific construction shown is not limitative in its relation to the scope of the invention but that the latter is to be construed 'in the lightof the appended claims.

Having thus described my mvention, what I desire to claim and secure by Letters ent is:

1. In injection apparatus, an ampul, pene- Pattrable closures therefor enclosing a chammore readily penetrated than the opposite closure when pressure is applied to the movable closure and transmitted through said needle, a stop on said needle cooperating with the forward closure for determining the limit of protrusion of said needle and for effecting thereafter the penetration of said movable closure upon continued movement of the latter, the bore of said needle communicating intermediately with said chamber. l

2. A needle for an ampul of that type in which the needle is enclosed in the fluid chamber of the ampul and is caused to successively puncturethe end closures of said ampul when one of said closures is forced inward, functioning as a plunger, said needle comprising a tubular portion having an angularly disposed inner. end, and an im-- in which the needle is enclosed in the fluid chamber of the ampul and is caused successively to puncture the end closures. of said ampul when one of said closures is forced inward, functioning as a plunger, said needle comprising a tubular portion having a lateral opening intermediate the ends of said needle, and means forming a stop also at an intermediate portion of said needle.

4. A needle for an ampul of'that type in which the needle is enclosed in the fluid chamber of the ampul and is caused successively to puncture the end closures of said ampul when one of said closures is forced inward, functioning as a plunger, said needle comprising a tubular portion having a lateral opening intermediate the ends of said needle, and means forming a stop also at an intermediate portion of said needle, the opposite ends of said needle having a different degree of acuteness.

5. In injecting apparatus, an ampul comprising a tubular bod penetrable closures therefor enclosing a uid chamber, one of said closures being movable to function as a plunger, a needle in said chamber having its oppositeends operatively positioned to penetrate said closures when the movabl one of them is pressed inwardly of said body, the working end of said needle being more readily penetrable through the closure with which it is associated than is the rearward end of the needle with respect to its associated "closure, said needle being provided intermediately with a passage communicating with said chamber, and with a stop engageable with the forward closure.

to limit the extent of protrusion of said needle and to determine the subsequent penetration of the rearward closure by said needle, so that said closure may be pushed into said chamber to discharge the contents thereof through said needle notwithstanding the stationary condition of thelatter.

6. In combination, an ampul, and a syringe for receiving the same, said ampul having end closures, the inner end closure being movable, andsaid syringe having a hollow plunger rod for pushing said. inner end closure into said ampul, a needle initially wholly enclosed within said ampul, the

ends of which penetrate and protrude through the end closures as the rear end closure is pushed in said plunger rod telescopin over the rearwardly protruding end of sai needle.

7. An ampul including a tube havin spaced end closures, and a double ende needle initially enclosed within said ampul supported between said closures, the relativepenetrability of the forward end of the I needle with respect to the front closure being greater than the relative penetrability of the rearward end of the needle with respect to the rearward closure whereby when said closures are pressed together the needle penetrates successively the forward and then the rearward closure, said needle-being open to the interior of said ampul.

8.-'An am 111 including a .tube having spaced endc osu'res, and'means including a needle. normally enclosed within said ampul and supported between said closures, said means and the respective end closures being constructed with different relative degrees of penetrability, whereby when said closures are pressed together said means punc- *0 tures successively the forward and then the rearward closure, said needle being open to the interior of said ampul.

In testimony whereof I have signed my name to this specification.

HENRY S. MORTON.

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