Method and apparatus for the recording and analysis of uterine electrical activity from the abdominal surface

• US 5,546,953 A
• Filed: 05/19/1994
• Issued: 08/20/1996
• Est. Priority Date: 05/19/1994
• Status: Expired due to Term

• Current Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Original Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Inventors: Garfield, Robert E.
• Primary Examiner(s): HINDENBURG, MAX F
• Application Number:
  US08/246,214
• Time in Patent Office: 824 Days
• Field of Search: 128/733, 128/738, 128/774, 128/778, 128/782
• US Class Current: 600/546
• CPC Class Codes: A61B 5/035 Intra-uterine probes therefor
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287
• CPC Class Codes: A61B 5/391 of genito-urinary organs
• CPC Class Codes: A61B 5/42 Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems A61B1/00, A61B5/4857, A61B5/486, A61B5/4866, A61B5/4869 take precedence
• CPC Class Codes: A61B 5/4356 Assessing uterine contractions A61B5/033 takes precedence
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal

Abstract

A method and apparatus for recording and analyzing uterine electrical and mechanical activity from the abdominal surface. Electrodes are applied to the abdominal surface of a patient, and electromyographic signals produced by the electrodes are digitized, stored and analyzed to assess uterine electrical activity. Assessment of the function of other smooth muscle organs, for example the bladder and lower gastrointestinal tract is also contemplated.

Claims

1. A method of characterizing uterine electrical activity, comprising:

applying action potential measuring electrodes to an abdominal or vaginal surface of a patient;

storing electromyographic signals, including action potentials, produced by said electrodes;

analyzing uterine activity indicating parameters from action potentials within said stored electromyographic signals; and

characterizing uterine activity of said patient based on said parameter analysis.

2. The method of claim 1, further comprising:

stimulating a vagina of said patient while said electromyographic signals are being stored; and

diagnosing labor as a function of said parameter analysis.

3. The method of claim 2, said stimulating step comprising, mechanically stimulating said vagina.

4. The method of claim 2, said stimulating step comprising, pharmacologically stimulating said vagina.

5. The method of claim 2, said stimulating step comprising electrically stimulating said vagina.

6. The method of claim 2, said diagnosing step comprising, assessing conduction of action potentials in said uterus as a result of said stimulating step.

7. The method of claim 1, said analyzing step comprising, calculating a burst frequency of action potentials in said stored electromyographic signals.

8. The method of claim 7, said characterizing step comprising, characterizing said uterine activity by comparing said calculated burst frequency with a predetermined threshold.

9. The method of claim 1, said analyzing step comprising, calculating a frequency of action potentials within a burst of action potentials in said stored electromyographic signals.

10. The method of claim 9, said characterizing step comprising, comparing said calculated frequency of action potentials with a predetermined threshold.

11. The method of claim 1, said analyzing step comprising, calculating a duration of bursts of action potentials within a said stored electromyographic signals.

12. The method of claim 11, said characterizing step comprising, comparing said calculated burst duration with a predetermined range.

13. The method of claim 1, said analyzing step comprising, calculating a number of action potentials within each burst of action potentials in said stored electromyographic signals.

14. The method of claim 13, said characterizing step comprising, comparing said calculated number of action potentials within each burst with a predetermined threshold.

15. The method of claim 1, said analyzing step comprising, calculating a magnitude of action potentials within said stored electromyographic signals.

16. The method of claim 15, said characterizing step comprising, comparing said calculated magnitude of action potentials with a predetermined threshold.

17. The method of claim 1, said analyzing step comprising, calculating a rise time of action potentials within said stored electromyographic signals.

18. The method of claim 17, said characterizing step comprising, characterizing conduction of action potentials as a function of said calculated rise time.

19. An apparatus for recording and analyzing uterine electrical activity from the abdominal or vaginal surface, comprising:

at least one action potential measuring electrode applicable to an abdominal or vaginal surface of a patient under analysis;

an analog-to-digital converter, connected to said at least one electrode, for converting electromyographic signals, including action potentials, produced by said electrode into digitized data indicative of said electromyographic signals and action potentials;

a memory for storing said digitized data; and

a programmed computer for analyzing uterine activity indicating parameters from action potentials represented by said stored digitized data, and for providing an indication of uterine electrical activity of said patient under analysis as a function of said uterine activity indicating parameters.