Patent GB-486442-A (GB)
Title: Improvements in apparatus for dispensing liquids for surgical injection and other purposes
IPC: A61M5/162
Filed: 1936-12-02
Abstract: 486,442. Dispensing liquids for surgical injections &c. SCHWAB, M. C. Dec. 2, 1936, No. 33078. [Class 116] [Also in Group VI] Apparatus for dispensing liquids, particularly surgical injection liquids, from bottles or other containers comprises a casing attachable to the container and having a chamber therein receiving liquid from the container, a gas or air inlet to the chamber arranged to conduct air or gas through the liquid therein, a partition between chamber and container having a conduit affording communication between them, and a liquid discharge passage passing through partition and chamber. As shown in Fig. 1, a bottle 5 has screwed to it at 10 a casing 8 containing a chamber 9. A partition 18 is held by the casing against the mouth of the bottle with an interposed washer 27 and is combined with a tube 17, extending towards the closed end of the bottle and opening into the chamber by a port 29, and a discharge tube 22 the bore 23 of which extends as a separate tube 24 within tube 17 and opens through the side thereof at 25. One or more, preferably three, fine bore air inlet conduits 14 extend through lateral extensions 15 of the casing and open into the chamber at 16. On inverting the bottle, (to the position shown), liquid flows through tube 17 and port 25 and partly fills chamber 9. On drawing off liquid through tubes 24, 22, and a flexible tube 26, air is drawn in through conduit 14 and passes to the bottle via the liquid in chamber 9, port 29 and tube 17. Side conduits 30, 32, controlled by cocks permit the introduction of air, gas, or antiseptics into, or drainage of chamber 9. Alternatively, antiseptics may be introduced at 14. The air entering at 16 is washed or sterilized in the chamber. In modifications : (1) Two ports 29 communicate with two or more bores in a stem on the partition 18 extending to the closed end of the bottle or merely a short distance thereinto, a central bore corresponding to tube 24 having a cross bore providing ports such as 25 or opening freely into the bottle ; the chamber is of the same diameter as the bottle neck. (2) Discharge tubes 23, 24, and air tube 17 are placed side by side and formed integral with one another and with the partition 18. (3) Tube 17 is of substantially the same length as tube 24 and has two ports such as 29 ; both tubes are closed at their upper ends and have lateral ports at these ends ; a three-way cock, in one setting connecting tube 24 with atmosphere to remove air therefrom, and in settings at right angles to this permitting and stopping draw-off, may be provided. (4) A short draw-off tube has within it an air tube communicating with lateral ports above and below the partition. As shown in Fig. 11, the partition 107 and the casing 105 have glands 108, 110, through which passes a liquid draw-off tube 99 connected by a flexible tube 113 with an injection needle 114. An air-inlet tube 115 passes through a gland 116 in tube 99 and is connected by a flexible tube 119 with the upper part of the chamber 104, both tubes being thus longitudinally adjustable. In another construction, a short air-inlet tube with lateral ports, similar to 17, 29, Fig. 1, has passing through it a liquid discharge tube longitudinally adjustable in a tubular extension of the partition, the extension passing through the chamber and having a packing gland external thereto. The invention may be applied to containers having withdrawal control cocks the casing being secured to the outlet side of the cock and the withdrawal and air inlet tubes, particularly when longitudinally adjustable, extending through the cock when opened. The appliance may be made of glass, or of the material sold under the Registered Trade Mark "Bakelite," or metal lined with glass.