Patent ID: 9550035
Date: 2017-01-24
CPC Classifications: A61M,B05B,G01F,G01H,G10K

Claim:
1. A method to deliver medication comprising: providing an acoustic volume sensor, the acoustic volume sensor including a variable-volume chamber, a reference volume, an enclosure, a printed circuit board, and a processor, the reference volume being defined by the printed circuit board within the enclosure, the printed circuit board including an acoustic source, a first microphone and a second microphone; the variable-volume and the reference volume forming at least part of an acoustic system; coupling a disposable drug cassette to the acoustic volume sensor, the disposable drug cassette including a drug reservoir and a valve, the valve in fluid communication with the drug reservoir; determining the volume of the variable-volume chamber in a first instance; controlling the valve to release an amount of drug; determining the volume of the variable-volume chamber in a second instance; and determining the amount of drug to output from the drug reservoir associated with a change in the volume of the variable-volume chamber.