Passive reuse prevention syringe that uses a tip lock

A syringe assembly, comprising:

• a syringe barrel having an inside surface defining a chamber, an open proximal end, and a distal end;
• a syringe outlet disposed on the distal end of the barrel, the outlet having a cylindrical shape with an outwardly tapering distal end portion, an inside surface defining a passage in fluid communication with the chamber, and a locking mechanism disposed within the passage;
• a hub comprising a cylindrical skirt portion having an open proximal end and a distal end;
• and
• a plunger assembly disposed at least partially within the syringe barrel, the plunger assembly comprising an elongate plunger rod, a plunger head connected to the plunger rod, the plunger head including a sealing member disposed thereon, and an extension, the extension including a tip on a distal end thereof,
• wherein the cylindrical skirt portion of the hub is disposed on the outlet and forms a mating engagement with the outlet,
• wherein the locking mechanism is adapted to engage and retain the tip of the extension of the plunger assembly in a locked position at least partially within the passage of the outlet, and
• wherein the locking mechanism comprises a plurality of flexible protrusions disposed about the inside surface of the outlet and extending into the passage and the flexible protrusions are disposed within the outlet proximally of the distal end portion of the outlet.

A syringe assembly comprising:

• a syringe barrel having an inside surface defining a chamber, an open proximal end, and a distal end;
• a substantially conical tip disposed on the distal end of the barrel, the substantially conical tip having an inside surface defining a passage in fluid communication with the chamber and a locking clip disposed within the passage;
• and
• a plunger assembly disposed at least partially within the syringe barrel, the plunger assembly comprising an elongate plunger rod and a plunger head connected to the plunger rod, the plunger head having a sealing member disposed thereon, and an extension,
• wherein the locking clip is adapted to engage and retain the extension of the plunger assembly in a locked position at least partially within the passage of the substantially conical tip, and
• wherein the locking clip comprises an outer cylindrical ring having an inner circumferential surface and a plurality of rigid fingers extending from the inner circumferential surface into the passage of the substantially conical tip, the fingers being adapted to engage and retain the extension of the plunger assembly via an interference fit.

A syringe assembly, comprising:

• a syringe barrel having an inside surface defining a chamber, an open proximal end, and a distal end;
• a syringe outlet disposed on the distal end of the barrel, the outlet having a cylindrical shape with an outwardly tapering distal end portion, an inside surface defining a passage in fluid communication with the chamber, and a locking mechanism disposed within the passage;
• a hub comprising a cylindrical skirt portion having an open proximal end and a distal end;
• and
• a plunger assembly disposed at least partially within the syringe barrel, the plunger assembly comprising an elongate plunger rod, a plunger head connected to the plunger rod, the plunger head including a sealing member disposed thereon, and an extension, the extension including a tip on a distal end thereof,
• wherein the cylindrical skirt portion of the hub is disposed on the outlet and forms a mating engagement with the outlet,
• wherein the locking mechanism is adapted to engage and retain the tip of the extension of the plunger assembly in a locked position at least partially within the passage of the outlet,
• wherein the hub further comprises a tip extending from the distal end of the cylindrical skirt portion, the tip of the hub having an orifice extending therethrough in fluid communication with an interior of the cylindrical skirt portion such that the orifice is in fluid communication with the passage of the outlet, and a plug portion extending proximally within the interior of the cylindrical skirt portion from the distal end of the cylindrical skirt portion so as to form an annular recess defined within the interior of the cylindrical skirt portion between the plug portion and the cylindrical skirt portion, the annular recess being shaped to correspond to the distal end portion of the outlet and the orifice of the tip of the hub extending through the plug portion, and
• wherein the plug portion of the hub extends into the passage of the outlet of the syringe so as to close the passage and to cause the distal end portion of the outlet to engage the hub within the annular recess in a secured mating engagement.

A syringe assembly, comprising:

• a syringe barrel having an inside surface defining a chamber, an open proximal end, and a distal end;
• a syringe outlet disposed on the distal end of the barrel, the outlet having a cylindrical shape with an outwardly tapering distal end portion, an inside surface defining a passage in fluid communication with the chamber, and a locking mechanism disposed within the passage;
• a hub comprising a cylindrical skirt portion having an open proximal end and a distal end;
• and
• a plunger assembly disposed at least partially within the syringe barrel, the plunger assembly comprising an elongate plunger rod, a plunger head connected to the plunger rod, the plunger head including a sealing member disposed thereon, and an extension, the extension including a tip on a distal end thereof,
• wherein the cylindrical skirt portion of the hub is disposed on the outlet and forms a mating engagement with the outlet,
• wherein the locking mechanism is adapted to engage and retain the tip of the extension of the plunger assembly in a locked position at least partially within the passage of the outlet,
• wherein the locking mechanism comprises a plurality of flexible protrusions disposed about the inside surface of the outlet and extending into the passage,
• wherein the hub further comprises a tip extending from the distal end of the cylindrical skirt portion, the tip of the hub having an orifice extending therethrough in fluid communication with an interior of the cylindrical skirt portion such that the orifice is in fluid communication with the passage of the outlet, and a plug portion extending proximally within the cylindrical skirt portion from the distal end of the cylindrical skirt portion so as to form an annular recess between the plug portion and the cylindrical skirt portion, the annular recess being shaped to correspond to the distal end portion of the outlet and the orifice of the tip of the hub extending through the plug portion, and
• wherein the plug portion of the hub extends into the passage of the outlet of the syringe so as to close the passage and to cause the distal end portion of the outlet to engage the hub within the annular recess in a secured mating engagement.