Self-aligning power screw for syringe pump

A method for assembling a syringe pump that accurately dispenses fluid from a syringe while simplifying the assembly of the syringe pump, comprising the steps of:

• providing a frame with a valve assembly connectable to one end of the syringe;
• connecting a linear rail to the frame wherein the linear rail has a carriage slidably connected thereto and is disposed within the frame;
• connecting a travel block to the carriage;
• connecting a stopper, threadably attached to a power screw, to the travel block;
• mounting a first end of the power screw to a floating arrangement of bearings disposed within the frame and comprising:
• (i) a fixed bearing housing disposed within the frame about the first end of the power screw, (ii) a first bearing housed within the fixed bearing housing, (iii) and a second bearing housed within the fixed bearing housing axially-apart from the first bearing along a longitudinal axis of the power screw, wherein mounting the first end of the power screw to the floating arrangement of bearings comprises allowing the first bearing and the second bearing to float into position to allow a second opposite end of the power screw to hang freely and move relative to the first end to provide proper alignment of the power screw relative to the linear rail;
• providing a motor driven pulley connected to the power screw for rotating the power screw and driving the travel block and the carriage along the power screw and the linear rail;
• and
• connecting a connector to the travel block wherein the connector is connectable to a second end of the syringe.