US1181534A - Syringe for hypodermic injections. - Google Patents

Description

V. E. MALATO. SYRINGE FOR HYPODERMIC INJECTIONS.

APPLICATION FlLED 0CT.19| 194. 1,181 ,534. Patented May 2, 1916.

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VITTORIO EM. MALATO, OF MILAN,

ITALY.

SYRINGE FOR HYPODERMIC INJECT'IONS.

Application filed October 19, 1914.

To all whom t may concern:

Be it known that I, VITTORIO E. MALATO, doctor of medicine, a subject of the King of Italy, and resident of 18 Via Durini, Milan, Italy, have invented new and useful Improvements in Syringes for Hypodermic Injections, of which the following is a specification.

My invention relates to improvements m syringes for hypodermic injections.

The said improvements have for their object an automatic and instantaneous regulation of the pressure inside the syringe, another object is the absolute sterilization and disinfection of the instrument, and further objects are a rational and regular mode of use of the syringe, and simplicity of construction.

The new means embodied in said improved syringe to attain the above mentioned objects are hereinafter described.

An open tubular piston has at its outer end a cavity for an air-filter Above said cavity there is a hole, provided on a plano surface and particularly adapted to enter into a close Contact with the thumb, so that the latter can be used as an automatic valve. A means is provided to act as a .brake for the piston. This brake has for its object to produce, while using the syringe, a sufficient reaction on the thumb for the purpose of maintaining the efficiency of same while acting as a regulatingr valve.

As regards the construction, metallic means are provided for combining with one another the parts of the syringe which are preferably made out of glass.

In the annexed drawings are represented, by way of example, three different constructional forms of the syringe.

Figure 1 shows an elevational view partly in section and to a scale larger than full size, of a syringe of the siphon type, embodying my said improvements. Fig. 2 shows a sectional view of a second form of construction of a syringe of the same type as Fig. 1. Fig. 3 shows a sectional view, partly in elevation of a simple syringe. Fig. l shows a plane view of some details of construction. FigV 5 is a detail hereinafter referred to.

In the different figures, like numerals designate like parts.

The body or cylinder of the syringe is made of glass 1 and has at its upper open end a flange 2 and terminates at Specification of Le ers Patent.

Patented May 2, 1916.

Serial No. 867,507.

its lower end in a nozzle 3. A glass-piston lt is open at both ends, and terminates at the top end with a cavity or chamber G for asbestos wool or the like which forms an air-filter 7 This chamber is preferably comprised between two necks 5 formed in the glass.

8 is a regulating hole for the pressure inside the syringe, and is bored on a surface 9 either plane or slightly convex. To this surface is applied the thumb for the purpose of acting as an instantaneous valve on the hole 8 Piston 4 and cylinder 1 are respectively ground outside and inside and they enter and slide airtight one into the other.

The piston brake is made up of one or two springs 10 mounted on a support. Said support comprises a collar 11 prorided with two arms on which rest pieces 12 On the front of pieces 12 are fixed the springs 10 which are shaped as seen in Fig. 4. This support device is fitted on the syringe by a loose collar 11 against the flange Q so forming an eX- tending flange for the flange 2 while springs 10- are arranged tangentially to piston -4 Underneath flange Q is fitted another collar with arms 13 and through the arms of the collars 11 13- and the pieces 12 are bored in one line, holes 15 for the fixing screws 14 The screw threads for said screws are formed in the holes 15 1G are centering pins for collars 1land 13 17 are regulating thumb-screws, which enter the pieces 12 their heads 18 being set against the free ends of springs 10 so as to keep the latter pressed against piston 1 In the forms of construction shown in Figs. 1 and Q the siphon chamber is made up of countertube 20- which is fitted around cylinder 1 It is provided with a flange 2 which has the same function as flange Q in Fig. 3.

Tube 3 may constitute a natural tail or nozzle of cylinder 1 or as shown in Fig. 2. It may comprise a separate tube fitted to the short nozzle of the cylinder.

Tube 21 is loosely mounted around the nozzle 3 and co-acts with same to form the siphon chamber, while its lower portion is shaped in cross-section as not to correspond with its seating in tube 3, so as to leave a free passage for the injection liquid to pass to the nozzle 3, as will be seen at Fig. 5 which is a section through Figs. l and 2 at A-A.

In the siphon-forms, tubes m-3- to receive the holed needle (cannula) are formed at the end of countertube -20-.

While operating the syringe, the thumb is kept constantly at the top of the piston and upon the surface -9 above hole 8A- for the purpose of regulating instantly at will the pressure inside the cylinder.

For the purpose of sterilizing the injection liquid by heat, the hole of the needle, may be closed by pinning into it a piece of cork.

Having now particularly described and ascertained the nature of my invention and in which way the same has to be performed I declare that what I claim is:

l. A syringe for hypodermic injections comprising in combination a glass cylinder open at both ends, an open tubular piston fitted in said cylinder, a chamber at the top of said piston in direct communication with the interior of the piston, a flat surface at the top of said chamber, air-filtering substance in said chamber, a hole in said flat surface setting the filter-chamber in communication with the open air and adapted to the application of the thumb for the purpose of regulating the pressure in the interior of the cylinder.

2. A syringe for hypodermic injections comprising in combination a glass cylinder open at both ends, a flange on one end of the cylinder, an open tubular piston fitted in said cylinder, a chamber at the top of said piston in direct communication with the interior of said piston, a flat surface at the top of said chamber; a hole in said flat surface setting the filter-chamber in communication with the open air, 4a metallic collar with side arms resting on the flange of said cylinder, a metallic collar with side arms resting underneath the flange of said cylinder, two fixing pieces on said first collar, screws connecting said collars and fixing pieces, flat springs fixed with one end to said fixing pieces and resting with the other end against the piston, adjusting screws in said fixing pieces and with their heads set against said springs.

3. A syringe for hypodermic injections comprising in combination a glass-cylinder open at both ends and having at the bottom a nozzle, a flange on one end of the cylinder, a cylindrical countertube fitted around said cylinder, a nozzle at the bottom of the counter-tube to take a cannula, a tubular piece surrounding the nozzle of the first cylinder and mounted inside the countertube so as to form a Siphon-like communication between the first and the second mentioned nozzles, an open tubular piston fitted in said cylinder, a chamber at the top of said piston in direct communication with the interior of said piston, a flat surface at the top of said chamber', a hole in said flat surface setting the filter chamber in communication with the open air, air-filtering substance in said chamber, a metallic collar with side arms resting underneath the flange of said cylinder, a metallic collar with side arms resting on the flange of said cylinder, two fixing pieces resting on the last named collar-arm, connecting screws of said collars and said fixing-pieces, flat springs fixed with one end to said fixing pieces and resting against said piston, adjusting screws in said fixing pieces and with their heads set against said springs.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

VITTORIO EM. MALATC.

itnesses GRAN GIUCoNsI GUARiNoN, ARTHUR P. CORDERO.

Copies of this patent may be obtained for ive cents each, by addressing th'e `(lommissioner or Patents, Washington, D. C.

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