Patent ID: 7740792

Claim:
A method of forming a syringe, comprising: injection molding at least one polymeric material to form a preform that is open at both ends, wherein injection molding the preform comprises: forming an open-ended syringe tip defining a syringe outlet at a distal end of the preform, forming a barrel section in fluid connection with the syringe outlet via a passage between the barrel section and the syringe outlet, and forming an opening at a proximal end of the preform in connection with the barrel section; placing the preform into a blow mold die; and expanding at least a portion of the preform within the die, wherein expanding a portion of the preform comprises: extending a stretch rod through the opening in the proximal end of the preform and into a rearward portion of the syringe tip to seal the syringe outlet; forcing a gas within the preform; preventing the gas from entering the syringe tip; and further extending the stretch rod within the preform to form a barrel of the syringe.