SYRINGE WITH ROLLING DIAPHRAGM Russian patent published in 2019 - IPC A61M5/31 

FIELD: medicine.

SUBSTANCE: syringe comprises a pressure jacket having a distal end, a proximal end, and a throughbore therebetween. Syringe further includes a rolling diaphragm having a proximal end with an end wall for engaging a plunger, a distal end received within the throughbore of the pressure jacket. Distal end of the rolling diaphragm has a nozzle and a sidewall extending between the proximal end and the distal end of the rolling diaphragm along a longitudinal axis. At least a portion of one of the sidewall and the end wall has non-uniform thickness. At least a portion of the sidewall is flexible and rolls upon itself when acted upon by the plunger such that an outer surface of the sidewall at a folding region is folded in a radially inward direction as the plunger is advanced from the distal end to the proximal end of the rolling diaphragm.

EFFECT: invention relates to medical equipment, specifically to syringes for a fluid delivery system.

19 cl, 64 dwg