Track-indexed syringe

A finger grip configured to connect to a syringe having a barrel, a plunger, and a plunger rod to drive the plunger, the finger grip comprising:

• an engager moveable between a first position where the engager is arranged not to contact the plunger rod and a second position where the engager is arranged to contact a surface of the plunger rod to provide feedback to a user;
• an activator operable to move the engager between the first position of the engager and the second position of the engager;
• and
• a body having a lower side and an upper side, the lower side comprising at least one finger supporting surface to support one or more digits of the user, the upper side defining a frame arranged to surround the plunger rod and at least a part of an outer perimeter of the activator, the frame including a protrusion configured to prevent the activator from moving the engager from the second position to the first position.

A syringe including:

• a barrel having an end flange;
• a plunger;
• a plunger rod configured to drive the plunger;
• and
• a finger grip comprising:
• a body having a lower side and an upper side, the lower side comprising at least one finger supporting surface to support one or more digits of a user;
• a recess provided in the body and arranged to receive the end flange of the barrel;
• an engager moveable between a first position where the engager is arranged not to contact the plunger rod and a second position where the engager is arranged to contact a surface of the plunger rod to provide feedback to the user;
• and
• an activator operable to move the engager between the first position of the engager and the second position of the engager, the activator comprising a fixed part attached to the body and a movable part disposed to move the engager, the fixed part and the movable part being joined to each other by a pivotable joint and disposed on opposite sides of the barrel.