Topic 5 Flashcards
What are the advantages of infusion pump over manual administration of medication?
1) Can delivery small volumes more accurately
2) Precise programmed flow rates
3) Precise timing intervals
4) Minimize over infusing and under infusing patients
What is the purpose of microprocessor in infusion pump?
It monitors the input from the buttons, optical sensor and OEM, and triggers the corresponding outputs to on and off accordingly
why does a different resistor value is used to test the push button on the breadboard and uno board?
Because the internals of the circuit for the UNO is different compared to the components on the breadboard hence the UNO circuit requires a higher resistance to tap the output voltage
What is the difference between analogRead() and digitalRead()?
The difference is analog read measures the voltage of a sensor and the values vary from 0 to 1024 while digital read can only read 1 or 0 or HIGH/LOW
How does stepper motor work?
It produces rotation through equal angles for each digital pulse supplied to input via the different pole of the stator and rotor (electromagnet)
What is the formular to calculate Number of steps?
Number of Stator poles x rotor pole pairs
How to calculate per step angle of a motor?
360 degrees divided by the number of steps
What is the formular for Gears to calculate torque , speed and number of teeth?
Gear Ratio = NL/NM = wM/wL = TL/TM
NM = number of teeth on the motor side.
NL = number of teeth on the load side.
ωM = speed of motor.
ωL = speed at load.
TM = torque of motor.
TL = torque at load.
What is the purpose of a stepper motor driver?
1) To isolate the voltage from the Arduino and the stepper motor
2) To provide enough current so that it can drive the stepper motor
How does the Stepper motor work when common ground red wire is not use?
1) The motor driver will drive current in 2 directions of the 2 magnetic coils and
2) the first direction will induce the attraction of the rotor towards the electromagnet while
3) the second direction will induce repulsion of the rotor magnet away from the electromagnet
4) Hence we get a full 360 degree rotation with 90 degrees per step
Figure 2 shows a small motor running at 200 revolution per minute (rpm) drives a paper roller. The gear on the motor has 20 teeth and the gear on the roller has 50 teeth. Calculate how fast is the roller turning?
Gear ratio = NL/NM = WM/WL = TL/TM
Speed at motor (WM) = 200rpm
Teeth on load (NL) = 50 teeth
Teeth on motor (NM) = 20 teeth
Speed at load (WL) = ?
NL/NM = 50/20 = 2.5
2.5 = WM/WL
WM = 200rpm
WL = 200pm/2.5 = 80rpm
What is the issue of asking a nurse to manually infusion a patient rather than using an infusion pump?
Boredom due to repetitive work.
Consistency of dosage delivered.
It occupies nurses’ time from attending to more critical tasks.
