Syringe with suction-based automatic disabling

A syringe comprising:

• a syringe barrel having a barrel proximal end and a barrel distal end and defining a chamber configured for containing a fluid therein;
• a plunger axially movable within the chamber of the syringe barrel, the plunger having a plunger proximal end and a plunger distal end;
• and
• a stopper secured to the plunger distal end, the stopper axially movable with the plunger within the chamber, wherein the stopper includes:
• an attachment member configured to couple to the plunger distal end;
• and
• a cup member extending out distally from the attachment member, the cup member having a concave shape, wherein
• the syringe barrel comprises
• a cylindrical outer wall extending between the barrel proximal end and the barrel distal end;
• an end wall positioned at the barrel distal end;
• and
• a nozzle extending distally from the end wall, the nozzle defining a lumen through which fluid enters into or exits from the chamber;
• wherein an inner surface of the end wall comprises a generally flat surface;
• wherein the cup member is deflectable between the concave shape and a flat shape;
• wherein the stopper includes a nose member extending out distally past the cup member, the nose member positioned within a circumference of the cup member;
• wherein the plunger, and the stopper coupled thereto, are movable from a retracted position where the cup member and the nose member are axially separated from the end wall to an advanced position where the cup member is in contact with the end wall and the nose member extends into the nozzle;
• and
• wherein with the plunger and the stopper in the advanced position, the nose member extends into the nozzle and the cup member deflects from the concave shape to the flat shape, thereby creating a suction between the stopper and the end wall of the syringe barrel.

A syringe comprising:

• a syringe barrel having a barrel proximal end and a barrel distal end and defining a chamber configured for containing a fluid therein;
• and
• a plunger assembly axially movable within the chamber of the syringe barrel between a retracted position and an advanced position, the plunger assembly including:
• a plunger having a plunger proximal end and a plunger distal end;
• and
• a stopper secured to the plunger distal end, the stopper configured to suction to the barrel distal end upon the plunger assembly being moved to the advanced position;
• wherein the stopper is further configured to separate from the plunger and remain suctioned to the barrel distal end upon the plunger being moved axially from the advanced position back toward the retracted position.