Improvements in syringes / [Hermann Haussmann].

  • Haussmann, Hermann.
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in syringes / [Hermann Haussmann]. Source: Wellcome Collection.

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    N° 6801 A.D. 1880 L'pte of Application, 23rd Apr., 1889—Accepted. 13th July, 1889 COMPLETE SPECIFICATION. n 15 Improvements in Syringes. We, Hermann Haussmann, Sola B. Dunn ami James 0. McComb, all of 122 Randolph Street Chicago in the County of Cook, and State of Illinois, United States of America, Gentlemen do hereby declare the nature of this invention and in what manner the same is to be performed, to he particularly described and ascertained in and by the following statement:— This invention relates to hypodermic syringes. In the said syringes as heretofore constructed the fluid containing tube is composed of glass or other frangible material, in connection with which a reciprocating piston is employed for filling the tube and discharging the fluid therefrom. It is well known that syringes so constructed are easily injured by accidental contact with harder materials or on dropping to the floor or ground, and frequently by the changes in temperature. But another and more important objection to these syringes is the drying and consequent shrinking of the pistons from non-usage, which frequently necessitates the re-wrapping thereof before it will operate, thus occasioning annoyance and delay which is sometimes dangerous, for instruments of this character are frequently employed, in emergencies where a moments delay would be fatal. The prime object of this invention is to have a compressible elastic tube for con¬ taining the injecting fluid which may be discharged therefrom by compression, and 20 the tube refilled by the expansion thereof only, whereby all danger of the fracture of the tube is avoided, and the necessity for the employment of a piston dispensed with, and to provide suitable mechanism for compressing said tube. Another object is to combine with such a tube a pressure roller for compressing the same which shall be operated in substantially the same manner as the ordinary 2f, piston, that is by means of a piston rod, which may be, if desired, gauged so as to indicate the quantity of liquids injected. Another object is to have the compressing roller mounted in a suitable carriage having a sliding connection with the frame of the syringe, whereby the piston rod will be relieved of objectionable twisting and friction in its bearing, and a uniform 30 pressure exerted on the tube throughout the length thereof, whereby a vacuum is at all times produced behind the compression roller, and the tube rendered easier to fill and capable of operating to its full capacity. We attain these objects by the devices illustrated in the accompanying drawing, in which :— 35 Figure 1 represents an enlarged plan view of a syringe embodying our invention. Figure 2, a side elevation thereof. Figure 3 a transverse vertical section on the line 3, 3 of Figure 2, and, Figure 4 a central longitudinal section. Similar letters of reference indicate the same parts in the several figures of the 4Q drawing. Referring by letter to the accompanying drawing A indicates a metallic frame piece or base plate, the ends B B1 of which are upturned at a right angle and between which extends a compressible tube 0, rigidly secured to the frame plate at the rear thereof by means of a clamping plate D between which and the frame plate, the end 45 of the tube is compressed and firmly clamped, and the said plate rigidly secured in position by a screw E working loosely through the base plate and tube, ar.d engaging the clamping plate about the centre thereof, it being immaterial, however, whether one or more screws are employed. Such a connection also serves to seal the rear end of the tube against the possible 5Q escape therethrough of the fluid contained in the tube. [ Price 8<f. J