Pump startup algorithms and related systems and methods
An infusion pump includes a pumping mechanism having at least one sensor and a pump motor and a pump control subsystem configured to control operation of the pumping mechanism, the pump control subsystem including a processor, a memory, and a startup module configured to drive the pump motor at a first rate, receive input from the at least one sensor, and drive the pump motor at a second rate based on the input received from the at least one sensor. Startup algorithms command an infusion pump to reach a targeted delivery rate or steady state in minimal time without requiring priming of the pump line or otherwise engaging in known methods of pump startup analysis.
1. A method of driving an infusion pump motor of an infusion pump configured to reach a steady state, target delivery rate with minimal delay, the method comprising:
driving the infusion pump motor at a first rate;
sensing a force generated by driving the infusion pump motor;
determining an inflection point of a sensed parameter; and
upon determining when the inflection point is reached, driving the infusion pump motor at a second, gradual, decreasing transitional rate, the transitional rate being an inverse function of the force sensed.
2. The method of driving an infusion pump motor of claim 1 , wherein the sensed parameter is an infusion pump motor plunger driver force.
3. The method of driving an infusion pump motor of claim 1 , wherein determining an inflection point further comprises deriving at least one parameter.
4. The method of driving an infusion pump motor of claim 3 , wherein the derived parameter is at least one of force velocity or force acceleration.
5. The method of driving an infusion pump motor of claim 3 , wherein the first rate is greater than the second rate and the second rate is greater than the third rate.
6. The method of driving an infusion pump motor of claim 1 , further comprising driving the infusion pump motor at a third rate.
7. The method of driving an infusion pump motor of claim 1 , wherein the first rate is greater than the second rate.
8. The method of driving an infusion pump motor of claim 7 , wherein the second rate is stepped or curved.
9. The method of driving an infusion pump motor of claim 1 , further comprising characterizing a breakout force.