US388029A - Syringe - Google Patents

Description

(No Model.)

J. A. DUNN.

SYRINGE.

No. 388,029. Patented Aug. 21, 1888.

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UNllE STATES J. AUSTIN DUNN, OF CHICAGO, lLLlNOlS.

SYRINGE.

EPECIPIOATION forming part of Letters Patent No.

388,029, dated August 21, 1888.

A pplicaiiou lilcd October 29., 1887. Serial No. 153,154. (No model.)

.7 0 (ZZZ whom, it may concern.-

Be it known that I, J. AUSTIN DUNN, a citi zen of the United States, residing at Chicago, in the county of (look and State of Illinois, have invented a ccrtai n new and useful Syringe, of which the following is a specification.

Myinvention relates to medicinal syringes, such as are used for introducing medicines into cavities in the body, particularly the cavities in the teeth, about the eyes, &c., and also such syringes as are used to introduce medicines into the flesh and under the skin and the like.

The object of my invention is to provide such a syringe with changing and adjusting the projecting needle or point at will. These Obj by means of the device illustrated in the aceonipanying drawings, whcrein- Figure 1 is a sectional view through my device with the parts separated from each other and the needle removed. Fig. 2 is a similar view of a modification. Fig. 3 is a side View of the needle with the packing-head. Fig. is a modification of the same with part of the needle broken away.

Like parts are indicated by the same letter in all the figures.

A is a compression-bulb adapted to contain the medicine to he used.

B is ahead, of metal or other suitable material, which is forced into the end of the comprcssioirbnlb. C is a conical cavity in the same, which terminates in the conduit D, which passes out through the screw-threaded projec tion E.

F is a packing-collar about against the flange l).

G is a thickened the compressionbulb to more securely hold it on the head.

J is a screw-threaded conneetingpiccc K, and it is adapted to receive the screw-threadcd portion L is a channel through K, which registers with the channel I). Itterminatesin the l'un nel'shapcd cavity M in the projecting portion N, the outer portion of which is screw-threaded to pass into the apertureP of the tip 0.

' point S, and is in a line with the E and bearing tip may be terminated in the provided with channels L the channel It and D.

edge about the mouth of eavityin the end of T is a hollow needle having the discharge aperture U at one end and at the other the head V, adapted to be received into the funuel'shapcd apcrtn re M. This head V is shown also in Fig. 4, where it is combined with an elastic collar, \V. The head V may he made of any desired material,- bnt I prcfrrubberor some elastic material. I t has a central aperture through which the needle 1 passes.

The device is put together in the following manner: The screw-threaded projection E is screwed into the scrcw-thrcznlcd aperture J, where a tightjoiut is made by means of the washer F, or otherwise. The needle '1 is then passed through the channel ll, thehcad Vresting in the funnelshaped cavity M. By then screwing the head N into the aperture P the parts of the device are all brought together to make a continuous syringe.

In Fig. 2 a modification is shew-n whereby the part K is substantially dispensed with. A is a compressionbulb for holding the medicine; B K, the combined head-piece and c0nnection; L, the channel; M, thel'unnclshaped aperture; 0', the conical aperture opening into the hull) A,- N, the threaded projection on K; G, the thickened edge of the bulb A.

The piece 0 and needle T are applied to the modification shown in Fig. 2, as above de scribed.

The use and operation of my invention are as follows: The several parts having been securely screwed together by applying a little additional pressure to turn the part 0 on the part N, the elastic head V, or, i f such head is not elastic, the elastic washer W, is pressed against the sides of the cavity M, and thus a tightjoint or connection is made between the hollow needle and the channel L l), which leads into the interior of the compressiozrbulb A. The compression-hull) A is now filled with the medicine or chemical to he used in the ordinary manner, when the syringe is ready for operation. Its application is similar to that of other similar syringes. If, now, the needle should become corroded, broken, or damaged, it may be removed and. another needle substituted without damage to the other portions of the syringe. Thus the part 0 may he an screwed from the projection N, the needle broken or rendered unfit for use may now be ZOC removed from the head V, and another needle substituted in its stead, whereupon the parts may be secured together in the described manner and the device be ready for operation. Of course it will be perfectly apparent that the head V may be greatly altered, as by making the greater part of it solid and combined with the compression-washer W; verted or otherwise changed, the essential feature being that the needle centers in line with the channel L D, and is secured in position of the elastic substance which surrounds it on account of the rotation of the piece 0. By this means it is possible to easily adjust or remove needles, thus permitting the operator without any serious difficulty to change so as to use needles of different size or shape or for different purposes without dispensing with any of the other parts of the syringe. This is a matter of some importance in localities removed from factories whereinstruments of this character can be easily made or mended, for

it permits the user to keep a supply of needles, which can be inserted without difficulty and without loss of time pense of sending to the factory for repairs.

Having thus described my invention, w at claim, and desire to secure by means of Letters Patent, is as follows:

In a medicinal syringe, the combination of 30 the body of a syringe with a compressible packing-piece, a needle which passes through said packing-piece, and a compression-piece which is connected with the body of the syringe and partially incloses the packing, the parts 35 so constructed and related that the needle is secured to the syringe solely by the pressure of the compressible packing, substantially as described.

J. AUSTIN DUNN.

Witnesses:

CORA L. CADWALLADER, FRANCIS W. PARKER.

and without the ex- 2 5

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