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Method and device for contraction monitoring

  • US 10,456,074 B2
  • Filed: 10/29/2015
  • Issued: 10/29/2019
  • Est. Priority Date: 10/29/2014
  • Status: Active Grant
First Claim
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1. A contraction monitoring system comprising:

  • an electrode patch comprising at least two electrodes, including a first measurement electrode and a reference electrode, wherein the electrode patch is positionable on an abdomen of a pregnant woman; and

    a sensor module configured to be connected to the electrode patch, wherein the sensor module is configured to perform a method comprising;

    measuring a biopotential signal with the at least two electrodes,acquiring inertial sensing data with an inertial sensing module,automatically identifying the inertial sensing data that comprises one or more motion artifact signals resulting from the overall movement of the pregnant woman, movements of the abdomen induced by fetal movement, and local movement of the sensor module,inputting the inertial sensing data and out of band energy for the biopotential signal into an artifact filter, wherein the input comprises adapting a threshold over time dependent on the out of band energy,dynamically adjusting the threshold by calculating a moving baseline energy such that the moving baseline energy adapts with time to follow changes in the inertial sensing data or the out of band energy signal, and dynamically changing the threshold based on the moving baseline energy,dynamically adjusting the artifact filter by calculating a sensor motion energy from the inertial sensing data, establishing a set minimum level for the sensor motion energy, and lowering the threshold in proportion to the amount by which the sensor motion energy exceeds the minimum level,filtering or excluding, with the artifact filter, the one or more motion artifact signals from the biopotential signal,processing the filtered biopotential signal, with a signal processing module, to extract one or more electrohysterogram signals, andprocessing the one or more electrohysterogram signals, with the signal processing module, to extract one or more uterine contraction signals.

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