Volumetric measurement device, system and method
AssigneeDEKA Products Limited Partnership
InventorsGregory R. Lanier, Jr., John M. Kerwin, Colin H. Murphy, Larry B. Gray
Life of this patent
Estimating the term…
Abstract
An acoustic volume sensing device is disclosed. The device includes a housing comprising a reference volume chamber and a variable volume chamber, the reference volume chamber and the variable volume chamber connected by a resonant port, a first MEMS microphone located in acoustic relation to the variable volume chamber, a second MEMS microphone located in acoustic relation to the reference volume chamber, a MEMS speaker located in acoustic relation to the reference volume chamber, and a circuit board in electric connection with the first and second MEMS microphones and the MEMS speaker.
Claims11
A method for determining a volume of fluid that has exited a measurement chamber in an infusion pump system having a pump for pumping fluid into the measurement chamber and a check valve for allowing fluid to flow from the measurement chamber, the method comprising:
- pumping fluid into the measurement chamber with the pump;
- completing a first acoustic volume sensing measurement of a measurement chamber where the measurement chamber is at a first predetermined pressure;
- pumping fluid into the measurement chamber pumping fluid until the measurement chamber reaches a second predetermined pressure;
- completing a second acoustic volume sensing measurement of a measurement chamber where the measurement chamber is at the second predetermined pressure;
- changing the measurement chamber pressure to the first predetermined pressure;
- and
- completing a third acoustic volume sensing measurement of a measurement chamber where the measurement chamber is at the first predetermined pressure, and
- opening the check valve when the pressure of the fluid in the measurement chamber exceeds the first predetermined pressure.
A method for determining a volume of fluid that has exited a measurement chamber in an infusion pump system having a pump for pumping fluid into the measurement chamber and wherein the measurement chamber has a MEMS microphone and a MEMS speaker, the method comprising:
- pumping fluid into the measurement chamber with the pump;
- completing a first acoustic volume sensing measurement of a measurement chamber where the measurement chamber is at a first predetermined pressure;
- pumping fluid into the measurement chamber pumping fluid until the measurement chamber reaches a second predetermined pressure;
- completing a second acoustic volume sensing measurement of a measurement chamber where the measurement chamber is at the second predetermined pressure;
- changing the measurement chamber pressure to the first predetermined pressure;
- and completing a third acoustic volume sensing measurement of a measurement chamber where the measurement chamber is at the first predetermined pressure and wherein the steps having completing an acoustic volume sensing comprise generating an acoustic sound with the MEMS speaker and sensing the acoustic sound with the MEMS microphone.
Dependencies are inferred from the claim text.