Mini peristaltic pump for Wearable HD: power and battery life
Power and battery life for wearable hemodialysis. The pump(s) will consume the most energy of all the components of the system. Other power consumers could include, control circuits, wireless communication, display and warning lights, depending on design. A continuous display could consume a great deal of power if not handled correctly. LEDs and LCD indicators would be a lower power choice than a full video panel, but perhaps not as cool.
There ar
e many small peristaltic pumps that can deliver between 0 mL/min and 100 mL/ min and beyond. A small peristaltic pump (JZZ-DOSING PUMP) with three modes, 0.5 watts, 1 watt, or 2 watts, 6 V, 12 V, or 24 V can pump from 0 mL/min to 200 mL/min. I’m not sure if this particular model has only three speeds or can operate at three different speed ranges, but assuming 100 mL/min puts us in the 12 V mode then the pump would use 1 watt.
https://www.amazon.com/dp/B01HRPKBAE?psc=1
For 12 v and 1 watt of power consumed: Then very obviously a 12-hour operation period would require a 12-watt-hour battery and 24 hours would require a 24-watt-hour battery. That’s 1000 mAh and 2000 mAh.
Rechargea
ble batteries of this capacity are widely available. 12V Tenergy 2000mAh NiMH Battery Pack with Bare Leads for RC Airplanes. 10 ounces.
https://www.amazon.com/Tenergy-2000mAh-Battery-Leads-Airplanes/dp/B00408X4LU
If we need two pumps then either two batteries are needed or cut the operating time in half to 12 hours.
A 7″ LCD touch screen (off the shelf raspberryPi controlled) can consume as little as 500 mAmp at 5 V, or 2.5 Watts (according to specs). Not a lot but now our 24 wh battery goes from running two pumps for 12 hours to running two pumps and a display for 5 hours 20 minutes.
There are, of course, smaller passive displays, a 3″ LCD screen (not currently commercially available off the shelf) can use as little as 60 mW (. This would reduce the 12 hour time by only 30 minutes. Obviously we can always throw more battery at the problem if the goal is 24 hour life between battery recharge or replacement.