Infusion Pumps and Methods for Use
First Claim
Patent Images
1. A device comprising:
- at least one first chamber;
at least one second chamber, each second chamber having a pressure sensor to measure pressure in each second chamber;
at least one third chamber having a dispensing port;
a device controlling the flow of gas from the first chamber to the second chamber;
a movable boundary between the second chamber and the third chamber; and
a processor.
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Abstract
Infusion pump device and methods allow for determination of volumes and flow rates of fluids delivered. Determination is accomplished without direct measurement of either the fluid or flow rate, but by measuring pressure differentials of abutting chambers. The ideal gas law is used to calculate of the volumes and flow rates of the fluids dispended by the devices and via the methods disclosed herein.
145 Citations
21 Claims
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1. A device comprising:
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at least one first chamber;
at least one second chamber, each second chamber having a pressure sensor to measure pressure in each second chamber;
at least one third chamber having a dispensing port;
a device controlling the flow of gas from the first chamber to the second chamber;
a movable boundary between the second chamber and the third chamber; and
a processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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providing at least one first chamber holding a gas;
providing at least one second chamber holding a gas;
providing at least one third chamber holding a fluid to be delivered;
determining a first pressure in each first chamber;
determining a first pressure in each second chamber;
transferring gas from at least one first chamber to at least one second chamber to determine the volume of a second chamber;
determining a second pressure in each first chamber;
determining a second pressure in each second chamber; and
calculating the dispensed volume of fluid from the third chamber based upon the determined first pressures and second pressures. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method comprising:
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calculating the pressure difference in a first chamber and a second chamber after a gas has been transferred to calculate the volume of a third chamber by a) determining the volume of the first chamber and the total volume of the second and third chambers. b) determining the pressures of both the first chamber and second chamber prior to transfer of the gas from the first chamber to the second chamber;
c) transferring an aliquot of gas from the first chamber to the second chamber; and
d) determining the pressures of both the first chamber and the second chamber after the gas is transferred;
calculating the volume of the second chamber from the pressure data collected prior to the transfer of gas and the pressure data after the transfer of the gas using the ideal gas law;
calculating the volume of the third chamber by subtracting the volume of the second chamber from the total volume of the second and third chambers to determine the volume of fluid delivered. - View Dependent Claims (21)
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Specification