Infusion Pumps With A Position Detector
First Claim
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1. A fluid delivery detector for an infusion pump, comprising:
- a magnet coupled to a movable partition of the infusion pump, a position of the moveable partition correlating with an amount of fluid in the infusion pump; and
a plurality of magnetic sensors located along a body of the infusion pump, the moveable partition configured to move along a portion of the body, each of the plurality of magnetic sensors configured to emit a signal when subjected to a magnetic field of the magnet, each signal indicative of the position of the moveable partition.
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Abstract
An infusion pump (e.g., an electrokinetic infusion pump) includes an infusion pump module and an engine that can drive a moveable piston non-mechanically. In addition, the infusion pump module includes a position detector configured for sensing a dispensing state of the infusion pump module. Such information can be utilized in a control scheme to control fluid displacement within and out of the pump. Descriptions of different types of position detectors, such as magnetic sensors (e.g., an anisotropic magnetic resistive sensor), and their implementation in detecting infusion pump fluid displacement are described.
266 Citations
26 Claims
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1. A fluid delivery detector for an infusion pump, comprising:
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a magnet coupled to a movable partition of the infusion pump, a position of the moveable partition correlating with an amount of fluid in the infusion pump; and
a plurality of magnetic sensors located along a body of the infusion pump, the moveable partition configured to move along a portion of the body, each of the plurality of magnetic sensors configured to emit a signal when subjected to a magnetic field of the magnet, each signal indicative of the position of the moveable partition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrokinetic infusion pump comprising:
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an infusion pump module; and
an electrokinetic engine;
wherein the infusion pump module includes an anisotropic magnetic resistive (AMR) displacement position sensor configured for sensing a dispensing state of the infusion pump module. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of sensing a fluid displacement state in an infusion pump, comprising:
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actuating movement of a moveable partition of the infusion pump to displace fluid from the pump;
detecting a position of the moveable partition using at least one anisotropic magnetic resistive (AMR) sensor; and
relating the position of the moveable partition with a quantity of fluid displaced from the infusion pump. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification