Monitoring of cervical dilatation during labor

• US 4,476,871 A
• Filed: 04/23/1982
• Issued: 10/16/1984
• Est. Priority Date: 04/23/1982
• Status: Expired due to Term

• Current Assignee: Corometrics Medical Systems, Inc.
• Original Assignee: American Home Products Corporation (Pfizer Inc.)
• Inventors: Hon, Edward H.
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): Hanley, John C.
• Application Number:
  US06/371,371
• Time in Patent Office: 907 Days
• Field of Search: 128/774, 128/775, 128/778, 128/780, 128/748, 128/639, 128/642, 128/670, 128/695, 128/696, 128/698, 128/700, 200/83 N, 200/81.4, 73/716
• US Class Current: 600/376
• CPC Class Codes: A61B 5/035 Intra-uterine probes therefor
• CPC Class Codes: A61B 5/1076 for measuring dimensions inside body cavities, e.g. using catheters A61B3/1005 takes precedence
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1464 specially adapted for foetal tissue
• CPC Class Codes: A61B 5/252 by suction
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/435 Assessing cervix alteration or dilation
• CPC Class Codes: A61B 5/4362 Assessing foetal parameters

Abstract

A device for use in monitoring cervical dilatation during labor. The device comprises an elongated member having a longitudinal axis, the member being adapted to be positioned between a fetal presenting part and a cervix; and means for measuring the recession of the cervix with cervical dilatation from the elongated member and along the longitudinal axis thereof. Also provided are systems and methods of monitoring cervical dilatation during labor. An elongated member having a longitudinal axis is positioned between a fetal presenting part and a cervix. The elongated member is anchored against longitudinal movement with respect to a maternal reference point. The recession of the cervix with cervical dilatation from the elongated member and along the longitudinal axis is measured.

Claims

1. A device for use in monitoring cervical dilatation during labor comprising:

an elongated flexible compressible member having a longitudinal axis and being adapted for positioning between a fetal presenting part and a cervix; and

means for measuring the recession of the cervix along the longitudinal axis of the elongated compressible member during cervical dilatation which include pressure detecting means having a plurality of pressure responsive switches spaced axially along the member for detecting a position along the longitudinal axis of the member at which pressure is exerted thereon by the fetal presenting part and the cervix.

2. The device of claim 1, wherein the elongated member is a tube.

3. The device of claim 2 further comprising electrode means for receiving a maternal ECG signal from the cervix, and wherein each of the switches comprises projection means and pad means for coupling a maternal ECG signal to means for detecting the maternal ECG signal, and wherein each switch is responsive to compression of the tube at said switch to connect the projection means to the pad means.

4. The device of claim 3 wherein the electrode means comprise a plurality of electrodes spaced axially along an outer wall of and radially aligned relative to the tube, and wherein the projection means comprises a plurality of projections, each electrode being aligned relative to the axial direction of the tube with and connected to a respective one of the projections.

5. The device of claim 3 or 4 further comprising means for positioning the electrode means to contact the cervix.

6. The device of claim 5, wherein the positioning means comprises a second tube affixed to the elongated tube in side-by-side relationship therewith.

7. The device of claim 5 wherein the positioning means comprises a second tube affixed to the elongated tube in side-by-side relationship therewith for use in measuring intrauterine pressure.

8. The device of claim 2 wherein each of the plurality of pressure responsive switches comprises a first switch contact mounted on an interior wall of the tube and a second switch contact mounted on the interior wall opposite said first switch contact.

9. A method of monitoring cervical dilatation during labor comprising the steps of:

positioning an elongated member having a longitudinal axis between a fetal presenting part and a cervix; and

measuring the recession of the cervix during cervical dilatation along the longitudinal axis of the elongated member by detecting a maternal ECG signal at at least one locus of contact between the elongated member and the cervix.