US2276098A - Venom extractor - Google Patents

Description

Patented Mar. 10, 1942 UNETED STTES Claims.

This invention relates to a device for mechanically extracting venom in cases of snake bites, and the object of the invention is to provide a simple compact device which can be readily carried in field or woods, and which permits the quick and eificient removal of venom when occasion requires.

A further object of the invention is to provide a device of the character indicated, having means adapted to efficiently contact large or small areas where the bite may occur, as for instance, on fingers or the larger limbs or body.

A further object of the invention is to provide improved structure assuring constantly eficient operation of the device, regardless of long periods of nonuse.

Further objects will more particularly appear in the course of the following detailed description.

The invention consists in the novel construction, arrangement and combinations of parts hereinafter more particularly described and claimed.

One sheet of drawings accompanies this specification as part thereof, in which like reference characters indicate like parts throughout.

In the drawing:

Figure l is a small scale perspective of the complete unit;

Figure 2 is a vertical cross-section view through the assembled device;

Figure 3 is a fragmentary perspective showing the container top with the cap removed and the pump in position;

Figure 4 is a vertical cross-section view through the pump;

Figure 5 is a transverse cross-section taken on line 5-5 of Figure 4; and

Figure 6 is a transverse cross-section taken on line 68 of Figure 4.

In accordance with the present invention a cylindrical container I having one end closed, is provided, the same being formed near its open end with oppositely disposed bayonet joint slots 2-2. A cap 3 is provided for the container I adapted to telescopically embrace the open end of the latter, and having oppositely disposed inwardly directed pins 44 arranged to co-act with the bayonet slot 2-2 to secure the cap in position.

The pump arrangement consists of a cylinder 6 having an integral end wall 8, the outer portion of the cylindrical wall adjacent the end 8 being beveled as at 9 and said end formed with a central cup-like orifice l0 surrounded by an annular groove ll having one of its Walls beveled as at i2. The end wall 8 is further provided with an inwardly directed stud I3 formed on its inner end with a seat for a washer l4 surrounding a bore which communicates with I the cavity it and provides a sliding support for a valve stem 56 having on its inner end a head H, the head being beveled concavely on the side adjacent the valve stem, as indicated at i3, to provide an annular knife edge to engage the washer M. A washer IQ is positioned on the outer end of valve stem It, being secured thereon by a transverse pin 28 and a compression spring 2! is interposed between the bottom of cavity It and washer is to maintain valve head i! in normal engagement with washer M.

The open end of cylinder 6 is externally threaded to receive the internally threaded cap 25, which cap is provided with an inwardly directed conical stud 26 having a central orifice 27 in which is slidable a piston rod 28. The inner wall of cylinder 6 adjacent stud 2'8 is beveled as at 22 to form with said stud a conical chamber adapted to expand a cup washer 3! which is carried on the inner end of piston rod 28 between flat washers 3Ei-3ll on a reduced portion of said rod, all of said washers being secured on said red as by a nut 32.

A compression spring 33 bears at one end against the outer washer 33 of the piston, while its other end seats over the projection I3 and this spring operates normally to force the piston with its cup washer toward cap 25 whereon each stroke of the piston it will be noted the cup washer is expanded to a diameter slightly larger/ than the inner wall of the cylinder 6, thus assure" ing a continuous tight fit and perfect suction regardless of nonuse of the device over long periods.

An adapter element 35 is provided with two bores of substantially different diameter, the larger bore having an annular beveled wall 35 adapted to frictionally engage the outer beveled portion 9 of cylinder 6, while the smaller bore 31 has its outer wall beveled as at 38 and adapted to frictionally engage the beveled wall l2 of the annular groove H when the adapter is reversed from the position shown in Figure 4, or as illustrated in Figure 2.

It will be apparent from the consideration of Figures 2 and 4 that the pump elements can with this adapter be used with either the large bore in cases where the bite occurs on relatively large portions of the body, or can be used with the small bore where the bite occurs on a finger or other small part of the body.

A tourniquet tape 4| is conveniently coiled on a small bobbin and adapted to be received within the larger bore 35 of the adapter which will also accommodate a capsule 40 of some suitable antiseptic. A small lancet 45 can be accommodated within container I along with the pump.

When the pump element is positioned in container l with the adapter end at the bottom as illustrated in Figure 2, it will be noted that to position the cap the piston must be depressed, thus compressing spring 33 so that when cap 3 is then engaged by means of the bayonet slots 22 the piston end 39 will engage the inner wall of cap 3 and exert an outer pressure thereon, thus securely locking the cap against accidental disengagement and preventing any rattling of the pump element in the container.

Preferably, the adapter 35 will be formed of glass or other transparent material, so that venom extracted by operation of the pump element with accompanying blood can be Visible and the pump removed and the accumulated blood and venom released as occasion requires.

In operation, where a person is bitten by a poisonous snake, the pump element and lancet 45 will be removed from the container, together with the capsule of disinfectant 40 and bobbin of tourniquet tape 4|. The tourniquet will be immediately applied between the bite and the heart, to stop circulation of the venom toward the heart and the area surrounding the bite will be sterilized with the antiseptic from capsule 40.

With the lancet 45 incisions will be made direct-v ly at the bite and with the adapter 35 positioned on the end of cylinder 6 to best accommodate itself to the particular location of the bite, the piston rod 28 will berapidly reciprocated, thus producing a substantial suction for drawing blood and venom from the incisions. The cup washer will have uniform close adhesion to the cylinder wall 6 and the valve IE will operate to permit the passage of air upwardly into the cylinder on each stroke.

Various modifications in the precise construction and arrangement of the parts will readily suggest themselves to those skilled in the art but within the scope of the present invention as claimed.

What I claim as my invention is:

1. Venom extractor comprising a closed cylinder, a piston and piston rod reciprocable in the cylinder having a cup washer engaging the walls of the cylinder, a valve controlled port at one end of the cylinder and a washer expanding element at the other end of the cylinder.

2. Venom extractor comprising a cylinder, a piston and piston rod reciprocable in the cylinder having a cup washer adapted to expandingly engage the cylinder wall, a valve controlled port at one end of the cylinder, a cap engaging the other end of the cylinder, the cap provided with an inwardly extending conical projection having a central bore for the piston rod, the cylinder having its inner wall adjacent said projection outwardly beveled to form with said projection an outwardly flaring seat for the cup washer to expand same, substantially as specified.

3. Venom extractor comprising a closed cylinder, a piston reciprocable in the cylinder, a valve controlled port at one end of the cylinder, an adapter having difierential bores with tapered walls, the cylinder being formed at its valve end with tapered seats adapted to interchangeably engage the tapered walls of the adapter.

4. Venom extractor comprising a cylinder, closure means at one end of the cylinder forming with the adjacent cylinder Wall a conical chamber to expand a cup washer, a piston carrying a cup Washer, reciprocable in the cylinder, a port in the opposite end of the cylinder a washer seat formed around the inner end of the port, a valve having a stem reciprocable in the port and a head on its inner end formed with an annularly beveled edge adapted to engage a washer in the washer seat and spring means operative on the valve stem to maintain the valve head against said washer.

5. The device of claim 2 with a compression spring operative on the piston to eject the piston rod from the cylinder, and a container adapted to receive the cylinder with its piston rod in its innermost position, a. closure for the container, and interlocking means between the container and closure comprising slot and pin connectios held locked by the outward pressure of the piston rod.

PAUL W. SAUNDERS.

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