Detection and communication of plunger position using induction
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United States of America Patent
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Apr 18, 2023
Grant Date -
May 27, 2021
app pub date -
Feb 5, 2021
filing date -
May 25, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A syringe system, including a plunger, a microcontroller, a battery, and a coil. The syringe barrel having a proximal end, a distal end, and a cylindrical sidewall defining a longitudinal axis, the cylindrical sidewall extending longitudinally between the proximal and distal ends, the sidewall having an exterior surface and defining an internal volume, the plunger being positioned between the proximal and distal ends of the syringe barrel and being movable within the internal volume with respect to the syringe barrel in the longitudinal direction. The syringe barrel further includes a label disposed on the sidewall and having at least two conductive strips extending in a non-parallel direction with respect to the longitudinal axis and having unique lengths. The microcontroller is configured to determine a position of the plunger with respect to the syringe barrel by measuring a current induced in the coil by the at least two conductive strips.
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