US 12,214,116 B2
Methods and systems for providing control stability in a vacuum generation system using cascade proportional-integral-derivative (PID) controller
Brian T. Chiem, San Gabriel, CA (US)
Assigned to Alcon Inc., Fribourg (CH)
Filed by Alcon Inc., Fribourg (CH)
Filed on Aug. 30, 2021, as Appl. No. 17/460,630.
Claims priority of provisional application 63/077,753, filed on Sep. 14, 2020.
Prior Publication US 2022/0080098 A1, Mar. 17, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 1/00 (2006.01); A61F 9/007 (2006.01); G05D 16/20 (2006.01)
CPC A61M 1/74 (2021.05) [A61M 1/743 (2021.05); G05D 16/2066 (2013.01); A61F 9/00736 (2013.01); A61F 9/00745 (2013.01); A61M 2205/50 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of controlling vacuum pressure in a vacuum generation system, the method comprising:
receiving a vacuum pressure sensor reading from a vacuum pressure sensor;
calculating a first error between the vacuum pressure sensor reading and a vacuum pressure set point;
calculating a supply air pressure set point based on the first error;
receiving a supply air pressure sensor reading from a supply air pressure sensor;
calculating a second error between the supply air pressure sensor reading and the supply air pressure set point;
calculating a voltage level for controlling a proportional valve based on the second error;
providing the voltage level to the proportional valve;
causing, using the proportional valve, supply air pressure to be provided to a vacuum generator based on the voltage level; and
providing, using the vacuum generator, vacuum pressure based on the supply air pressure to a surgical tool.