Patent ID: 7081191

Claim:
A capillary electrophoresis device comprising: a capillary array; a polymer storage container for holding polymer solution; a pressure-resistant syringe for pressurizing said polymer solution in said capillary array; a buffer container for holding buffer solution; a flow path block, to which a tip of said capillary array and said pressure-resistant syringe are connected, formed with flow paths for joining at least said tip of the capillary array, said polymer storage container, said pressure-resistant syringe, and said buffer container; a check valve for allowing a fluid medium to flow towards said flow path block from said polymer storage container side and preventing said fluid medium from flowing from said flow path block towards said polymer storage container side; and a plunger driver for driving said pressure-resistant syringe plunger in the push-in direction and pull-out direction; further characterized by drawing polymer solution into said pressure-resistant syringe from said polymer storage container by way of said flow path block, and injecting said polymer solution drawn from said pressure-resistant syringe into said capillary array by way of said flow path block; and characterized in that said plunger drive means has a stepping motor; a direct-driven actuator for converting the rotation of said stepping motor into linear movement; a moving piece for applying contact pressure to the rear edge of said plunger fixed to said direct-driven actuator; and a linear encoder for outputting a signal showing the position of said moving piece wherein said moving piece contains an inward/outward moving hook, and said plunger is clamped by said hook when said plunger is driven in the pull-out direction.