Design the electronic control of the medical instrument: a portable infusion pump, which can maintain very low flow rates of liquid medicine to be injected. There is a syringe and it is getting pushed by the nut, which is pushing on the piston of the syringe. The screw is rotating because of which the nut is moving and pushing. The screw is rotating through a gearbox by a stepper and with a pulse generator also. The whole thing is a very small portable item, which can administer medicines at a very low rate and it can be carried on the pocket of the patient. The syringe inner cross-section has been given to be 4 square millimeters, the gearbox ratio which is shown in the figure is one-fourth and the single start lead screw has a pitch of 1 mm. The stepper motor shaft rotates by one step by 1.8 degrees. 1 pulse creates 1 step and that gives rise to one drop of liquid medicine getting administered through the syringe into the body of the patient. Find out the volume of liquid in one drop of delivered medicine and select f that means the frequency of the pulse generator that would result in the delivery of 0.5 mm3 of liquid medicine per minute.

 

 

nn Motor driver Stepper motor Pulse generator Gear box, % Nut, pitch Lead screw 1 mm