AUTO-INJECTOR ASSEMBLY Russian patent published in 2018 - IPC A61M5/20 

FIELD: medicine.

SUBSTANCE: assembly comprises: a medicament container defining a substantially cylindrical chamber containing a liquid medicament, a proximal end of the chamber is closed by a piston movable therein, and a distal end of the chamber is closed by a seal spanning an opening, at a distal end of the medicament container, wherein the container seal is a pierceable septum; biasing means is coupled to the piston and acts to bias the piston towards the seal, thereby pressurising the liquid medicament; a hypodermic needle for parenteral administration of the liquid medicament; and a removable needle cap for maintaining the hypodermic needle in sterile conditions until use and a means for establishing fluid communication between the chamber and the hypodermic needle such that the pressurised liquid medicament is automatically delivered through the hypodermic needle when communication has been established. Means for establishing fluid communication is a valve comprising a valve housing defining a bore. Valve housing is coupled to the distal end of the container such that the pierceable septum is located at a proximal end of the bore, and a shuttle is slidably retained within the bore. Shuttle comprises a piercing element for piercing the pierceable septum when the shuttle is moved towards the proximal end of the bore to establish fluid communication between the chamber and the hypodermic needle. Liquid medicament is stored under pressure.

EFFECT: invention relates to medical equipment, namely to auto-injector assemblies.

17 cl, 12 dwg