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Apparatus for indicating uterine activity in labor

  • US RE31,158 E
  • Filed: 11/14/1979
  • Issued: 02/22/1983
  • Est. Priority Date: 06/23/1976
  • Status: Expired due to Term
First Claim
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1. Apparatus for indicating uterine activity in labor including:

  • means adapted to be coupled to a uterine pressure transducer for providing a first signal representative of intrauterine pressure,means for providing a second signal .[.which is equal to.]. .Iadd.representative of .Iaddend.the first signal except .[.when a.]. .Iadd.during each .Iaddend.contraction .[.occurs.]. when .[.it takes up a value equal to that of.]. the .Iadd.value the .Iaddend.first signal .Iadd.would have had .Iaddend.in the absence of .[.the.]. .Iadd.that .Iaddend.contraction .Iadd.is represented.Iaddend.,.[.means for subtracting the second signal from the first 65 signal, to provide a third signal,.]. .Iadd.means for deriving a third signal from the first and second signals, the third signal being representative of the additional uterine pressure, which occurs during contractions, above the uterine pressure existing in the absence of contractions.Iaddend., andmeans for integrating the third signal over intervals of at least ten but not more than thirty minutes to provide an activity signal indicative of uterine activity in labor.

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