Precise dose mechanisms and drug delivery syringes

摘要

Patent Specification: "Precise Dose Mechanisms and Syringes for Drug Delivery". The invention relates to a dose control mechanism 10 for a syringe including a plunger 14 having a coarse pitch screw 14b on its outer surface, a housing 20 having a corresponding coarse pitch guide 20c along the inner surface. of housing 20, a screw 30 having a fine pitch screw 30b interfacing with a fine pitch nut 18b of an adapter 18, wherein the plunger 14 has an inner annular space 14c within which the screw 30 resides at least partially an accurate dose drug delivery syringe includes such dose control mechanism 10, a cylinder 140, a plunger seal 136 and a cylinder adapter assembly 150 having a cylinder tip 152 and a needle 154. the syringe it may be a syringe for refill at use 100, a pre-filled syringe 200 or a safety syringe 300 having integrated needle sheath or needle retraction safety features or one of its combinations. Assembly, fabrication and operation methods are similarly disclosed. 21477957v1