Medicament filling system
A syringe assembly ( 2 ) that locks a syringe ( 10 ) to prevent backflow of medicament, the syringe assembly ( 2 ) comprising a syringe ( 10 ) including a barrel ( 12 ) configured to carry the medicament, a plunger ( 14 ) that communicates with the barrel ( 12 ), and a plunger head ( 16 ) disposed on a proximal end of the plunger ( 14 ), and a locking assembly ( 50 ) disposed around the barrel ( 12 ), wherein the locking assembly ( 50 ) prevents the plunger ( 14 ) from moving away from the barrel ( 12 ) to draw the medicament into the barrel ( 12 ).
1 . A syringe assembly that locks a syringe to prevent backflow of medicament, the syringe assembly comprising:
a syringe, including:
a barrel configured to carry the medicament;
a plunger that communicates with the barrel; and
a plunger head disposed on a proximal end of the plunger; and
a locking assembly disposed around the barrel, the locking assembly including a hook configured to engage the plunger head;
wherein the locking assembly prevents the plunger from moving away from the barrel to draw the medicament into the barrel.
2 . The syringe assembly of claim 1 , wherein the plunger head includes a dial dose to indicate a dose setting.
3 . The syringe assembly of claim 1 , wherein: the locking assembly includes: a depressible button and a spring member connected to the hook, wherein the depressible button controls engagement and disengagement between the hook and the plunger head.
4 . The syringe assembly of claim 3 , wherein:
the locking assembly further includes:
a base engaged to the barrel;
an arm that connects the hook to the depressible button and the spring member; and
a shaft that connects the arm to the base.
5 . The syringe assembly of claim 4 , wherein the shaft allows the arm to rotate to control engagement and disengagement between the hook and the plunger head.
6 . The syringe assembly of claim 4 , wherein:
the spring member contacts the barrel and is disposed on one side surface of the arm while the button is disposed on an opposing side surface of the arm;
when the button is in a free state, the spring member is compressed at a first compression force and the hook is engaged to the plunger head;
when the button is depressed, the spring member is compressed at a second compression force and the hook is disengaged from the plunger head; and
the second compression force is greater than the first compression force.
7 . The syringe assembly of claim 3 , wherein:
the plunger head further includes a platform disposed distally from a top surface of the plunger head; and
the hook is configured to engage the plunger between the top surface of the plunger head and the platform to lock the plunger.
8 . The syringe assembly of claim 7 , wherein the hook includes an indent feature that engages and disengages the platform to secure engagement.
9 . The syringe assembly of claim 3 , wherein the hook includes one of protrusions and a position indicator to aid in handling and dose setting.
10 . The syringe assembly of claim 1 , wherein the hook is configured to engage a proximal surface of the plunger head.
11 . The syringe assembly of claim 10 , wherein the hook engages the plunger head after the medicament is dispensed from the barrel of the syringe.
12 . The syringe assembly of claim 1 , wherein the locking assembly includes a depressible button and a spring member connected to the hook.