A method to deliver medication. The apparatus has an acoustic volume sensor that acoustically excites a reference volume and variable-volume chamber with an acoustic source and measures the acoustic response with microphones acoustically coupled to the reference and the variable-volume chamber. A di
A method to deliver medication. The apparatus has an acoustic volume sensor that acoustically excites a reference volume and variable-volume chamber with an acoustic source and measures the acoustic response with microphones acoustically coupled to the reference and the variable-volume chamber. A disposable drug cassette is coupled to the acoustic volume sensor and includes a drug reservoir and valve. The method includes receiving a volume signal and inputs from a user input or a second sensor and controlling the valve based on these inputs.
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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 en
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; anddetermining the amount of drug to output from the drug reservoir associated with a change in the volume of the variable-volume chamber. 2. The method to deliver medication according to claim 1 further comprising: exciting the acoustic system at a pre-determined frequency with the acoustic source;receiving a first signal from the first microphone associated with an acoustic response of the variable-volume chamber to excitement at the pre-determined frequency;receiving a second signal from the second microphone associated with an acoustic response of the reference volume to excitement at the pre-determined frequency;determining a resonant frequency of the acoustic system associated with the first signal and second signal; anddetermining the volume of the variable volume chamber associated with the resonant frequency. 3. The method to deliver medication according to claim 1 wherein the acoustic volume sensor comprises a temperature sensor, the temperature sensor being attached to the printed circuit board. 4. The method to deliver medication according to claim 2 further comprising: the acoustic volume sensor further comprises a temperature sensor;measuring the temperature of the acoustic system;providing a temperature signal;receiving a temperature signal; andfurther determining the volume of the variable volume chamber based on the signal from the temperature sensor. 5. The method to deliver medication according to claim 1 further comprising equalizing a pressure between the reference volume and the variable-volume chamber through a hole in the printed circuit board. 6. 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 reference volume forming at least part of an acoustic system, the processor configured to output a volume signal based on signals from the first and second microphone responding to the acoustic source;coupling a disposable drug cassette to the acoustic volume sensor, the disposable drug cassette including a drug reservoir and a valve, the valve being in fluid communication with the drug reservoir;receiving the volume signal;receiving a user signal, the user signal being associated with a user interface;determining an amount of drug to output from drug reservoir associated with the volume signal and the user signal; andcontrolling the valve to output the amount of drug. 7. 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 reference volume forming at least part of an acoustic system, the processor configured to output a volume signal based on signals from the first and second microphone responding to the acoustic source;coupling a disposable drug cassette to the acoustic volume sensor, the disposable drug cassette includes a drug reservoir, a valve and an output, the valve being in fluid communication with the drug reservoir, the output being in fluid communication with the valve;coupling the output to a second fluid;measuring a property of the second fluid with a second sensor;outputting a fluid signal associated with the measured property;receiving the volume signal;receiving the fluid signal;determining an amount of drug to output from drug reservoir associated with the volume signal and the fluid signal; andcontrolling the valve to output the amount of drug.
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