Fluid injector with syringe engagement mechanism

An engagement mechanism associated with a reciprocally movable piston of a fluid injector and configured for releasably engaging an engagement portion at a proximal end of a rolling diaphragm syringe, wherein the rolling diaphragm syringe comprises a flexible sidewall configured for rolling upon itself when acted upon by the reciprocally movable piston, the engagement mechanism comprising:

• a plurality of engagement elements reversibly and pivotally movable about a pivot pin relative to the engagement portion of the syringe between a first position, where the plurality of engagement elements are disengaged from the engagement portion of the syringe, and a second position, where the plurality of engagement elements are pivotally moved in a radially inward direction to engage with the engagement portion of the syringe;
• and
• a drive mechanism for moving the plurality of engagement elements between the first position and the second position, the drive mechanism comprising:
• an outer piston sleeve fixed relative to the reciprocally movable piston of the fluid inj ector;
• an abutment section movably received within the outer piston sleeve at a distal end of the outer piston sleeve, wherein the abutment section is operatively engaged with the plurality of engagement elements;
• and
• an inner piston sleeve movably received within the outer piston sleeve and connected with the abutment section such that movement of the inner piston sleeve causes movement of the abutment section, wherein the inner piston sleeve is movable by a piston rod movably coupled to the reciprocally movable piston,
• wherein movement of the reciprocally movable piston in a proximal direction moves the outer piston sleeve proximally relative to the abutment section, and
• wherein proximal movement of the outer piston sleeve relative to the abutment section moves the plurality of engagement members elements from the first position to the second position.

A fluid injector comprising:

• at least one injector head comprising at least one reciprocally movable piston;
• an engagement mechanism associated with the at least one reciprocally movable piston and configured for releasably engaging an engagement portion at a proximal end of a rolling diaphragm syringe, wherein the rolling diaphragm syringe comprises a flexible sidewall configured for rolling upon itself when acted upon by the at least one reciprocally movable piston, the engagement mechanism comprising:
• a plurality of engagement elements reversibly and pivotally movable about a pivot pin relative to the engagement portion of the syringe between a first position, where the plurality of engagement elements are disengaged from the engagement portion of the syringe, and a second position, where the plurality of engagement elements are pivotally moved in a radially inward direction to engage with the engagement portion of the syringe;
• and
• a drive mechanism for moving the plurality of engagement elements between the first position and the second position.