Thumb Press Frangible Feature for Re-Use Prevention

摘要

Syringe assemblies having a passive disabling system to prevent reuse are provided. According to one or more embodiments, the syringe assembly comprises a barrel, plunger rod and detachable thumb press wherein the plunger rod further comprises flexible locking petals that lock the plunger rod within the barrel, a ramp disposed adjacent to the locking element, and one or more frangible connection or break point at the proximal end of the plunger rod disposed either inside the thumb press or immediately adjacent to the thumb press to separate the thumb press from the main body of the plunger rod when a user applies sufficient proximal force to the plunger rod after it has been locked within the barrel.

主权项

1. A syringe assembly comprising:
a barrel including a cylindrical sidewall having an interior surface with a first cross-sectional width defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall having an opening therethrough in fluid communication with said chamber; an elongate plunger rod including a proximal end with a detachable thumb press, a distal end, a main body extending between the proximal and distal end, and a frangible element disposed at the proximal end of the plunger rod, the frangible element comprising one or more break point connections, the plunger rod being distally and proximally movable within the chamber, the distal end including a stopper slidably positioned in fluid-tight engagement with the inside surface of the barrel for drawing fluid into and driving fluid out of the chamber by movement of the stopper relative to the barrel; a locking element disposed on one or more of the barrel and plunger rod; and a ramp disposed proximally adjacent to the locking element having an increasing diameter from the locking element to the open proximal end.