Fluid delivery device with autocalibration
First Claim
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1. A method of delivering a dosage of liquid with a piston actuated pump, the piston having a stroke length, the method comprising:
- measuring a flow rate of the pump;
determining a flow characteristic of the liquid substantially simultaneously with measuring the flow rate of the pump, wherein the flow characteristic of the liquid corresponds to a rate of an electrochemical reaction of a component of the liquid;
determining a desired dosage;
determining a number of strokes corresponding to the desired dosage, wherein the determined number of strokes is based, at least in part, on the measured flow rate and the determined flow characteristic of the liquid; and
delivering the desired dosage by moving the piston the corresponding number of strokes.
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Abstract
A micro fluid delivery device is particularly useful in medical applications. The device may be worn or carried by the user and may deliver drugs or other medicaments to the user or patient. The device has a control system that accepts input from the user and controls all aspects of operation of the device. The control system measures the output of the pump and adjusts the output of the pump to achieve the desired dosage rate and size. This eliminates differences from pump to pump that result from inevitable variations in the manufacturing of such small scale affordable devices.
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Citations
20 Claims
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1. A method of delivering a dosage of liquid with a piston actuated pump, the piston having a stroke length, the method comprising:
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measuring a flow rate of the pump; determining a flow characteristic of the liquid substantially simultaneously with measuring the flow rate of the pump, wherein the flow characteristic of the liquid corresponds to a rate of an electrochemical reaction of a component of the liquid; determining a desired dosage; determining a number of strokes corresponding to the desired dosage, wherein the determined number of strokes is based, at least in part, on the measured flow rate and the determined flow characteristic of the liquid; and delivering the desired dosage by moving the piston the corresponding number of strokes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of delivering a liquid, the method comprising:
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measuring a flow rate of the liquid by determining when the liquid passes a first sensor having a plurality of electrodes and second sensor having a plurality of electrodes; determining a flow characteristic of the liquid substantially simultaneously with measuring the flow rate of the liquid; receiving a desired dosage amount; determining a number of strokes of a piston required to give the desired amount, wherein the determined number of strokes is based, at least in part, on the measured flow rate and the determined flow characteristic; and moving the piston the determined number of strokes to deliver the liquid. - View Dependent Claims (11, 12, 13, 14)
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15. A device for delivering a dosage of liquid, the device comprising:
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a piston actuated pump, wherein the piston has a stroke length; a first sensor and a second sensor for measuring a flow rate of the liquid; a third sensor for determining a flow characteristic of the liquid; a shape memory element configured to move the piston from a first point in a stroke length to a second point in a stroke length; and a processor configured to; determine a desired dosage; determine a number of strokes corresponding to the desired dosage, wherein the determined number of strokes is based, at least in part on the measured flow rate and the determined flow characteristic; and actuate the shape memory element to move the piston the determined number of strokes. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification