GB1232087A - - Google Patents

Abstract

1,232,087. Syringes. DRUMMOND INSTRUMENT CO. July 1, 1968 [March 14, 1968], No.31292/68. Heading F1R. [Also in Division A5] Hypodermic Syringes. A hypodermic syringe, Fig.1 for dispensing liquid in small quantities, comprises a barrel 10 having a bore 14 and graduation markings 12 on the outside, the terminals of the barrel being adapted to receive closure members 16, 18 which consist of discs 20, 32 which adjoin cylindrical portions 22, (34) Fig. 2 (not shown) respectively these diameters are substantially equal to that of the core 14. A capillary tube 40, extends coaxially along the bore and one end of the tube is a force bit in an enlarged bore (27) of the closure member 16. The bore (27) communicates with a smaller bore 26 extending right through the member and holding a hypodermic needle 28. The other end of the tube 40 passes through a clearance hole 36 of slightly larger diameter and flared at its inner terminal 38. A plunger for the syringe includes a body 46 whose diameter is substantially equal to the inside diameter of the capillary tube and which is set in a cap 48. Transfer Syringes. The hypodermic springe depicted Fig. 1 may be modified to provide a transfer syringe, Fig. 4, by providing a cylindrical portion 64 extending from a closure member 56 which is externably threaded at 66 and which adjoins a tapered portion 68 provided with a plurality of longitudinal slits 70, A capillary tube 88 which extends beyond the barrel 50 is prevented from moving by a knurled collar 74 which when threadably engaged with cylindrical portion 64 urges the tapered portion thereof to grippingly engage the outer periphery of the capillary tube 88. Intermediate of the body 94 of the plunger 92 there is provided a marking 100 which coincides with the hundred lambda mark on the barrel when the plunger is in the position shown,