Patent ID: 7150108

Claim:
A cervical calibration guide comprising: a gripable structure generally extending along a plane and configured to allow a user to grip the cervical calibration guide; and, a set of nested cervix-approximating reference structures that are coupled to but distinguishable from the grip able structure and which tend to generally lie in the plane with the gripable structure unless acted upon by one or more fingertips of a user, individual cervix-approximating reference structures of the set extending arcuately from a first portion of the gripable structure uninterruptedly along a majority of the cervical calibration guide when viewed orthogonal to the plane to a second opposite portion of the gripable structure effective to facilitate deflection of individual cervix-approximating reference structures out of the plane, the cervix-approximating reference structures collectively approximating calibrated instances of a progression of cervical dilation during delivery of a fetus.