| 摘要 |
<p>1501273 Plastics tube; valves AVON MEDICALS Ltd 18 Aug 1976 [22 Aug 1975] 34989/75 Headings F2P and F2V [Also in Divisions B4-B5] A capillary passage comprises a flow passage 9 (Fig. 1) within the body of a PVC tube 4 flattened and welded at its contacting inner surfaces 8 to eliminate the interface. The flow passage 9 runs parallel to a layer diameter bypass 12 (or is flanked by two bypasses) having a flattened, welded side 10. The tube 20 shown in Fig. 5 includes two axially spaced capillaries 11/13 of different diameters, with associated parallel by-passes 15/17 and a connecting passage 22. Closing of a chosen by-pass forces fluid to flow through the associated capillary, and is effected by a roller clamp 38 (Fig. 7) moving in grooves 36 in a channel member 34. The tube 20 lies along the channel base 32. Pressure on the tube is limited by the grooves 36, so that the thickness of the closed by-pass walls is greater than that of the capillary (see Fig. 3, not reproduced), and the grooves allow pressure release by raised portions 42. The tube 20 &c. is used to govern flow rate leading to a cannula or needle; priming is effected with all passages open, followed by selected clamping. Making of the tube is described (see Divisions B4-B5).</p> |
