US2981270A - Syringe releasing device - Google Patents

Description

April 25, 1961 s. L. CHAPMAN, SR 2,981,270

SYRINGE RELEASING DEVICE Filed Aug. 7, 1959 INV EN TOR.

: sit tats SYRINGE RELEASING DEVICE Samuel L. Chapman, Sn, Columbus, Ohio (3228 Little St., Port Huron, Mich.)

This invention relates to implements for cleaning hypodermic syringes, and more particularly to a device for unclogging a syringe.

A main object of the invention is to provide a novel and improved implement for unclogging a hypodermic syringe, the implement being simple in construction, being easy to attach to a syringe, and being easy to manipulate.

A further object of the invention is to provide an improved implement for unclogging a syringe which has become inoperative due to an obstruction in its discharge passage, the device being relatively inexpensive to fabricate, being easy to attach to a syringe in place of the needle of the syringe, and providing means of injecting Water or other cleaning liquid into the discharge passage of the syringe with a substantial amount of force so that said discharge passage will be freed of obstructions.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

Figure 1 is a longitudinal vertical sectional view showing a syringe releasing device according to the present invention attached to the discharge end of a hypodermic syringe in place of the needle associated with the syringe and arranged for injection of liquid into the hypodermic syringe for unclogging its discharge passage.

Figure 2 is a cross-sectional view similar to Figure 1 but showing the position of the parts after liquid has been injected into the discharge passage of the syringe by the syringe releasing device.

Figure 3 is a horizontal cross-sectional view taken substantially on the line 33 of Figure 2.

Figure 4 is an enlarged vertical cross-sectional view taken through the forward end portion of the syringe and the portion of the syringe releasing device attached thereto, as illustrated in Figure 1.

Figure 5 is transverse vertical cross-sectional view taken on the line 5-5 of Figure 4.

Figure 6 is' a transverse vertical cross-sectional view taken on the line 6-6 of Figure 2.

Referring to the drawings, 11 designates the barrel portion of a conventional syringe, said barrel portion being formed at its end with a reduced discharge conduit portion 12 having the discharge passage 13 extending axially therethrough. The reduced discharge end portion 12 of the syringe is formed with the cylindrical skirt portion 14 terminating in the inwardly directed, spaced radially extending lugs 15 which are lockingly engageable with the attaching lugs of a syringe needle, not shown. Slidably engaged in the barrel 11 is the usual syringe piston 16.

Designated generally at 17 is a syringe releasing device which may be employed to unclog the discharge passage 13 of the syringe by forcing water or similar liquid into the syringe in a direction reversed from the normal direction of flow of liquid out of the passage 13. Thus, the device 17 comprises an elongated tubular chamber 18 formed with a reduced cylindrical end portion 19 terminating in outwardly directed spaced locking lugs 2,981,273 Patented Apr. 25, 1961 20 identical to the corresponding locking lugs provided on the hypodermic needle, the end portion 19 being formed with the outwardly flaring bore 21 adapted to snugly engage on the outwardly convergent end surface 22 of the portion 12 of the hypodermic syringe. Thus, the tubular chamber 18 may be lockingly engaged with the lugs 14 of the syringe in place of the usual hypodermic needle, as is clearly illustrated in Figures 1, 2, 4 and 5.

The end portion of the tubular member 18 is formed with a cavity 24 which communicates with the outwardly flaring bore 21 of member 19, an annular shoulder 25 being defined at the plane at which cavity 24 communicates with the outwardly flaring bore 21, as is clearly shown in Figure 4. The cavity 24- communicates with an inwardly convergent bore portion 26 which terminates in an axial passage 27 communicating with the interior of the tubular chamber 18, as shown in Figure 4. A valve ball 27 is disposed in the conical passage 26, and a coil spring 28 bears between the valve ball 27 and the shoulder 25, biasing the ball 27 toward sealing engagement with the conical bore 26, as shown'in Figure 4, the ball 27 being releasable, however, responsive to a predetermined pressure developed in the chamber 18 by fluid in said chamber, whereby said fluid may flow past the valve ball 27 through the cavity 24 and out through the discharge end 19 of the chamber.

A piston 29 is slidably and sealingly engaged in the chamber 18, the piston being provided at its end with a sealing plunger element 30 of resilient deformable material which sealingly and slidably engages against the inside surface of chamber 18. At its outer end the piston 29 is provided with an enlarged, substantially oval head element 31.

The chamber 18 is formed at its rear portion with a conduit element 32 extending perpendicularly to the main body of the chamber and provided with the spaced lug elements 33 similar to the lug elements 20 on the member 19. Designated at 34 is a liquid reservoir which is detachably engaged with the conduit 32 by the provision of a cylindrical attaching skirt portion 35 provided with a conical axial spout element 36 sealingly engageable in the conduit 32, as shown in Figure 1. The skirt portion 35 is provided with the inturned lugs 37 similar to the lugs 14 and lockingly interengageable with the lugs 33 in the same manner that the lugs 14 are lockingly interengageable with the outwardly projecting lugs 20 on the end portion 19 of chamber 18.

The reservoir 34 is provided with the axially extending discharge bore 38 which is in communication with the conduit 32 when the reservoir 34 is attached to said conduit in the manner illustrated in Figure 1, whereby liquid 39 in the reservoir may pass through bore 38 and conduit 32 into the chamber 18 and will fill the space between the end of piston 29 and the discharge end portion of chamber 18. Water or any suitable liquid may be employed in the reservoir 34 for cleaning a syringe 11.

In using the cleaning device, the device is attached to the end portion 12 of a syringe in place of the conventional syringe needle, as illustrated in Figure 1, water or other suitable liquid being provided in the reservoir 34-. The piston 29 is then pushed inwardly to force the liquid 39 past the valve ball 27 and into the syringe bore 13, a suflicient impact being applied to the head 31 to provide a substantial building up of pressure behind the valve ball 27 When the valve ball 27 releases, the liquid under pressure is suddenly discharged into the syringe the spring 28 pushes the ball 27 back into sealing engagement in the conical passage 26, preventing any further flow of liquid 39 toward the syringe bore 13.

As shown in Figure 3, the rear end cap 4% of the tubular member 18 is preferably formed with laterally extending arm portions 41, 41 which may be employed as gripping means to facilitate the application of releasing force to the head member 31.

While a specific embodiment of an improved syringe releasing device has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

1. A syringe releasing device of the character described comprising an elongated tubular chamber, means embodying locking lugs on the forward end of said chamber lockingly engageable with the end of a. syringe in place of the syringe needle, 21 water reservoir communicatively connected to the intermediate portion of said chamber, a piston slidably and sealingly engaged in the chamber, and a piston rod connected to said piston and slidably and sealingly extending through the rear end of said chamber.

2. A syringe releasing device of the character described comprising an elongated tubular chamber, means on the forward end of said chamber lockingly engageable with the end of a syringe in place of the syringe needle, said chamber being formed with a forwardly flaring outlet passage adjacent the forward end thereof, check valve means in said outlet passage constructed and arranged to allow fluid to flow only forwardly through said passage, a water reservoir communicatively connected to the intermediate portion of said chamber, a piston slidably and sealingly engaged in the chamber, and a piston rod connected to said piston and slidably and sealingly extending through the rear end of said chamber.

3. A syringe releasing device of the character described comprising an elongated tubular chamber, means on the forward end of said chamber lockingly engageable with the end of a syringe in place of the syringe needle, said chamber being formed with a forwardly flaring outlet passage adjacent the forward end thereof, a valve ball member in said outlet passage sealingly engageable therein, an annular shoulder in said chamber spaced forwardly from the larger end of said outlet passage, a coil spring bearing between said shoulder and said valve ball member and biasing said ball member towards sealing position in said passage and being constructed and arranged to allow fluid flow only forwardly through said passage, a water reservoir extending perpendicular to said chamber and communicatively connected to the intermediate portion of said chamber, a piston slidably and sealingly engaged in the chamber, and a piston rod connected to said piston and slidably and sealingly extending through the rear end of said chamber.

References Cited in the file of this patent UNITED STATES PATENTS 1,238,269 Cornwell Aug. 28, 1917 1,388,854 Dezendorf Aug. 30, 1921 1,999,571 Nickerson Apr. 30, 1935 2,147,593 Bracken Feb. 14, 1939 2,843,508 Sheft T July 15, 1958 2,877,781 Lipp Mar. 17, 1959

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