| 摘要 |
A monitoring device (1) for internal vaginal examinations during labour to assess descent of the fetal head through the maternal pelvis. The device (1) comprises first (2) and second (3) sections mounted together so as to be co-axially extendable and retractable relative to each other to vary the distance between opposite free ends (2a) and (3b) of the device (1) and being adapted to be releasably restrained together at a plurality of selectable co-axial positions. The second section (3) has a reference mark (7) for use in setting the device for a patient to be examined so that the distance between the free end (2a) of the first section (2) and the reference mark (7) corresponds to the distance in the patient between the posterior fourchette and the plane containing the ischial spines.
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