How Do Chemyx Syringe Pumps Work?

A syringe pump is a small, positive-displacement pump used to gradually transfer precise volumes of fluid. All Chemyx Fusion series syringe pumps are driven via a stepper motor. This stepper motor precisely turns a lead screw that is threaded through a pusher block, which causes the pusher block to move.

When the pump is in infusion mode, the pusher block pushes against the plunger of a secured syringe, causing the fluid to be ejected at an accurate and precise rate. If the pump is capable of withdrawal, the plunger of the syringe is held by brackets on the pusher block.

When the stepper motor turns in the opposite direction, the pusher block moves such that the syringe plunger is pulled, thus drawing fluid into the syringe. For the Fusion Series syringe pumps, the pusher block moves to the right for infusion and to the left for withdrawal.

Controlled Elements

All Fusion Series pumps have a single lead screw through which the pusher block is threaded. The pusher block moves when the lead screw turns. The two guide rods keep the pusher block horizontal and perfectly perpendicular to the lead screw. The block-release button disengages the pusher block from the lead screw, which allows the pusher block to be easily moved to a new position as long as the button is held. Releasing the button will lock the pusher block back in place.

Syringes are placed on the syringe-holder block in the v-shaped grooves, or channels, and held securely using syringe clamps. The Fusion 100 and 200 both have two syringe channels, while the Fusion 400 has four smaller syringe channels. The safety collar of the Fusion 100 and 200 helps protect the integrity of syringes by keeping the pusher block from pushing on a completely depressed syringe.

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