Patent ID: 9050415
Filing Date: 2015-06-09
Classification: A61M,F04C,Y10T

Abstract:
1. A barrel adapter for a delivery syringe having a barrel and a plunger assembly adapted to move within the barrel, the adapter comprising: a barrel tip adapted to be sealingly engaged with a distal end of the barrel, a needle assembly including a needle and a needle hub through which the needle extends, the needle having a lumen, the needle assembly being disposed at least partially within the barrel tip, the needle adapted to move from an injection position in which the needle extends from a distal end of the barrel tip to a retracted position in which the needle is disposed within at least one of the barrel tip or the barrel, a stylet assembly including a stylet and a stylet disc, the stylet being axially slidable and at least partially disposed within the needle lumen, the stylet being proximally disposed and spaced from a distal tip of the needle when the needle is in the injection position, the stylet disc including at least one longitudinally extending passage, a needle retraction mechanism, the needle retraction mechanism including a biasing member and an actuable locking arrangement, the locking arrangement being disposed to maintain the biasing member in an energized position when the locking arrangement is locked and to release the biasing member when actuated, the locking arrangement being actuable by depression of the plunger assembly, the biasing member being disposed to provide relative motion of the needle and stylet from the injection position to the retracted position when the biasing member is released from the energized position, and an actuating mechanism including at least one longitudinally extending prong, the at least one longitudinally extending passage being disposed to slidingly receive the prong, the actuating mechanism being adapted for disposition within the barrel for longitudinal movement of the prong with the plunger assembly such that the prong engages at least one of the needle assembly and the needle retraction mechanism to actuate the needle retraction mechanism.