Drive ram for medical injectors

摘要

A drive ram for use with a medical fluid injector may include a central, longitudinal reference axis. First and second gripper members may be pivotally interconnected with a plunger engaging end of the drive ram. Each of the first and second gripper members may be pivotable about a common pivot axis that intersects the reference axis. Each of the gripper members may further include a first end that is remote from the common pivot axis. In some embodiments, the first and second gripper members may be pivotable between a first position and a second position. In the first position, the first ends of the gripper members may be spaced apart by a first distance, while in the second position, they may be spaced apart by a second distance that is greater than the first distance.

主权项

1. A drive ram for a medical fluid injector, the drive ram comprising:
a drive ram body that extends along a central, longitudinal reference axis; a gripper assembly comprising first and second gripper members; only one pivot pin engaged with said first gripper member; only one pivot pin engaged with said second gripper member; and a first pivot pin that interconnects said drive ram body with each of said first and second gripper members, wherein said first pivot pin extends through each of said first and second gripper members and is engaged with said drive ram body, wherein said first pivot pin is said only one pivot pin for said first gripper member and is also said only one pivot pin for said second gripper member;
wherein translational motion of said drive ram body along said central, longitudinal reference axis causes each of said first and second gripper members to translate by said drive ram body being interconnected with each of said first and second gripper members by said first pivot pin;wherein each of said first and second gripper members are mounted on the same said first pivot pin, wherein each of said first and second gripper members are pivotally interconnected with said drive ram body by the same said first pivot pin, and wherein said first pivot pin defines the only pivot axis about which each of said first and second gripper members are pivotable relative to said drive ram body;wherein each of said first and second gripper members further comprises a first end, wherein said first end of each of said first and second gripper members is remote from said first pivot pin, and wherein said first end of each of said first and second gripper members is engageable with a syringe plunger;wherein said first and second gripper members are pivotable about said first pivot pin between first and second positions, said first ends of said first and second gripper members being spaced apart by a first distance when said first and second gripper members are in said first position, and said first ends being spaced apart by a second distance greater than said first distance when said first and second gripper members are in said second position; and at least one biasing member urging said first and second gripper members toward said first position.