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US 8,007,247 B2Granted
End of stroke detection for electromagnetic pump
AssigneeMedtronic, Inc.
InventorsScott A. Sarkinen, James M. Haase, Ronald L. Mezera, Christian Michel Peclat
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Abstract
Detection of end of stroke for an electromagnetic pump is performed using, for example, a calculated first flux derivative.
Claims16
An electromagnetic pump system comprising:
- an electromagnetic pump comprising a coil that can be energized to produce a pump stroke, wherein the electromagnetic pump further comprises an actuator moveable in response to the energization of the coil;
- a direct current power source connected to selectively energize the coil of the electromagnetic pump, wherein the power source applies a source electrical potential to the coil to pass a coil current therethrough;
- a voltage sense device for sensing the source electrical potential applied to the coil;
- a current sense device for sensing the coil current;
- and
- control electronics to detect the end of a pump stroke based on a change in flux over time calculated as a function of sensed coil current and source electrical potential, wherein the change in flux over time is calculated independent of coil inductance Lcoil.
3 more elements
An implantable infusion device for delivery of infusion medium, the infusion device comprising:
- a drive mechanism comprising a coil that can be energized to produce a pump stroke, wherein the drive mechanism further comprises an actuator moveable relative to the coil in response to the energization of the coil to deliver infusion medium;
- a direct current power source connected to selectively energize the coil of the electromagnetic pump, wherein the power source applies a source electrical potential to the coil to pass a coil current therethrough;
- one or more sense devices to sense the source electrical potential applied to the coil and to sense the coil current;
- and
- control electronics to detect the end of a pump stroke based on a change in flux over time calculated as a function of sensed coil current and source electrical potential, wherein the change in flux over time is calculated independent of coil inductance Lcoil, and wherein the control electronics further comprises a switch device connected between the power source and the coil to connect the power source to the coil at the initiation of a pump stroke and disconnect the power source from the coil upon detection of an end of the pump stroke.
2 more elements
Dependencies are inferred from the claim text.