Apparatus for the detection and recording of uterine activity
First Claim
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1. Apparatus for detecting and recording the uterine pressure of a subject, comprising:
- detection means for effecting electromyographic detection of electrical fields inherent in muscular activity in the abdominal area of the subject and for producing a corresponding signal;
generating means connected to the output of said detection means for generating a signal which corresponds to the intensity of the alternating voltage component of the electromyographically detected signal at the output of said detection means;
means connected to said signal generating means for averaging in time the signal which corresponds essentially to the intensity of the alternating voltage component of the electromyographically detected signal; and
emitting means connected to said averaging means for emitting a representation of the time averaged signal as a measure of the intrauterine pressure.
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Abstract
Apparatus for the detection and recording of uterine activity, particularly for use as a contraction recorder and equipped for the electromyographic detection of the electrical fields in the abdominal region inherent in muscular activity, the apparatus being composed of a system for generating a signal which essentially corresponds to the intensity of the alternating voltage component of the electromyographically derived signal, averaging this signal in time, and emitting the averaged signal as a measure for the intrauterine pressure variations.
91 Citations
22 Claims
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1. Apparatus for detecting and recording the uterine pressure of a subject, comprising:
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detection means for effecting electromyographic detection of electrical fields inherent in muscular activity in the abdominal area of the subject and for producing a corresponding signal; generating means connected to the output of said detection means for generating a signal which corresponds to the intensity of the alternating voltage component of the electromyographically detected signal at the output of said detection means; means connected to said signal generating means for averaging in time the signal which corresponds essentially to the intensity of the alternating voltage component of the electromyographically detected signal; and emitting means connected to said averaging means for emitting a representation of the time averaged signal as a measure of the intrauterine pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. Apparatus for detecting and measuring the uterine pressure of a subject, comprising:
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electromyographic detection means for detecting electrical inherent in muscular activity in the abdominal area of said subject and for producing detection voltages corresponding thereto, said detection voltages having alternating voltage components, a bandpass filter coupled to said detection means for transmitting the alternating voltage components of said detection voltages in the frequency range 150 to 250 Hz, said frequency range being that in which interference components in said detection voltage are less than components corresponding to said uterine pressure, an integrating full-wave rectifier coupled to the output of said bandpass filter for producing a voltage substantially corresponding to the effective (RMS) value of the voltage at the output of said electromyograpic detection means, and indicating means coupled to the output of said integrating full-wave rectifier for measurement of said uterine pressure. - View Dependent Claims (21, 22)
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Specification