Suction injector

Abstract

An automatic injection apparatus has a tubular housing formed with a cylindrical boring and with a suction cup to receive a syringe with canula surrounding said cannula. The upper end of said housing is covered by a pot cylinder provided with an inlet bore for the air, having a cover with a sealing ring towards said tubular housing, fixing brackets to secure the sealing; supporting rings for the attachment of said syringe; while the piston rod is held in the central part of a folding bellows sealed to said cover. A parallel covering tube connected with said tubular housing by a base plate which contains a cross over duct between said boring of said tubular housing and a suction producing folded bellows sealed to said base plate and to a sleeve sealed to a lid plate, said shell sliding on a central bar, said sliding movement restricted by a cross pin lead by a longitudinal slot of said shell, which is surrounded by a pressure spring for extension of said folded bellows with said shell. This extension movement is blocked by a rod connected with said lid plate sliding in a guiding tube, caught in a notching groove by a catch pin, until an annular groove of a releasing bar, when lifted by the raising of a shell, surrounding the suction cup, frees the movement of catch pin and also said folding bellows, which produces suction, working through said cross over duct, so that the skin, closing the rim of said suction cup, is raised and delayed by the friction between the syringe piston and syringe cylinder. The little folding bellows collapses and presses the liquid medicine from the syringe through the cannula under the skin, elevated by suction. A nozzle, limiting a reventilation tube, effects the reventilation of the suction cup. A bush, connected with said pot cylinder, is shiftable along said rod and allows the removal of said pot cylinder from the tubular housing for a replacement of the syringe.