INJECTABLE SUBSTANCE FEEDING DEVICE

摘要

PROBLEM TO BE SOLVED: To inject a discontinuous amt. of a material into the dermis of of a human by selectively moving a syringe piston within a syringe forward and extruding an injectable substance from the syringe in an amt. possible to select. SOLUTION: A control valve assembly 60 is usually held to a closing position and the discharge passage 74 in a three-way valve 64 is opened in order to let the pressure on the downstream side of the three-way valve 64 escape and the main flow passage passing through a needle valve 62 and the three-way valve 64 is closed. When a trigger 14 is pushed down, a plunger 72 is moved toward the inside of the three-way valve 64 to open the flow passage passing through the three-way valve 64 and a lead nut 88 is linearly moved on a thread rod 90. Whereupon, the needle valve 62 is opened and compressed gas is transmitted to the interior of the syringe main body 46 of the rear part of a piston 52 to move the piston 52 and a collagen soln. is extruded to an injection part from a needle 48.