Improvements in hypodermic needles and syringes to be used therewith

Abstract

Abstract 141,423. Everett, S. J. Jan. 13, 1919. Syringes.-The needle of a hypodermic syringe passes through an india-rubber packing adapted to be compressed so as to make a tight joint between the needle and the syringe. The needle is grcoved, corrugated, or screw-threaded at the part engaged by the packing. In the form shown in Fig. 3, the screw-threaded portion b of the needle a is received within a tubular or solid rubber packing g contained in a union e attached to the nipple c of the syringe. The packing is compressed by means of a nozzle i which is screwed on to the union e and forces inwardly a sleeve or gland h. The outer end of the gland h may be split to form jaws which are compressed round the needle by a tapered portion of the nozzle i. The inner end of the needle may be chamfered to engage a stop-pin l in the nipple c. In a modification, the nozzle i screws within the union c and presses directly against the washer g. In a further modification, Fig. 5, a wasber g<2> is compressed by a screw o, and a set-screw p engaging the needle may also be employed. Fig. 1 shows a needle in which corrugations b or a screw-thread are formed on a thickened portion of the needle.

Inventors

No inventors recorded.

Bibliographic Details