公开(公告)号：US20230042083A1

公开(公告)日：2023-02-09

申请号：US17942043

申请日：2022-09-09

Applicant: Analog Devices, Inc.

Inventor： Alan DUGAS ,  Lalinda D. FERNANDO

IPC: G01F23/263 ,  A61M5/168

Abstract: A sensor for measuring the contents of a syringe or other container is described. The sensor includes a voltage source, a pair of electrodes, a measurement circuit, and an electrode shield. The voltage source is coupled to the electrodes, and the electrodes apply an electric field through at least a portion of the container or syringe. The measurement circuit measures capacitance across the electrodes. The electrode shield partially encloses the pair of electrodes. The electrode shield may include an inner electrode shield having a second voltage, and an outer electrode shield having a third voltage.