Patent ID: 7637418

Claim:
A gestational wheel calculator comprising: a plurality of plates joined together at and rotating about a common axis, to bring written notations on the plates into meaningful juxtaposition to provide gestational information, said written notations including: a calendar plate rotating on the axis comprising a calendar, said calendar comprising: at least nine and not greater than twelve segments, each segment corresponding to a respective calendar month, each segment comprising at least one and not greater than thirty-one marks corresponding to particular calendar days for its respective month, each mark spaced from adjacent marks by a predetermined angle with respect to the axis, for each segment a mark defining a first mark and other marks, each mark having an appearance, said appearance of the first mark being noticeably different from the appearance of the other marks of the particular segment; a second plate rotating on the axis comprising: marks spaced apart by the predetermined angle and labeled with numbers in a range of twenty to forty-five; an intercourse timing calculator comprising: a sperm life plate rotating on the axis comprising: a marker for marking a corresponding date on the calendar plate, said date representing a date upon which intercourse occurred, and a sperm survival probability curve; an egg life plate rotating on the axis comprising: a marker for marking a corresponding date on the calendar plate, said date representing a date upon which ovulation occurred, and an egg survival probability curve; wherein one of the sperm life plate and the egg life plate is transparent and is superposed upon the other and wherein the sperm life plate and the egg life plate rotate relative to each other about the axis; a gestational age, ultrasound landmark probability, and ultrasound medical pregnancy test measurement scale plate, said plate rotating on the axis, said plate comprising: day markers, each day marker spaced from adjacent day markers by a predetermined angle with respect to the axis, wherein each day marker indicates gestational age in days, weekly sub-markers, each weekly sub-marker spaced from adjacent weekly sub-markers by a predetermined angle with respect to the axis, wherein each weekly sub-marker indicates gestational age in weeks, wherein each weekly sub-marker's appearance is noticeably different than that of each day marker's appearance, gestational ultrasound landmark probability curves, each curve representing a probability for ultrasound visualization of fetal development landmarks, each curve further characterized in that it is located at a predetermined angle with respect to the axis gestational ultrasound medical pregnancy test measurement scales, each scale comprising marks, each mark positioned at a predetermined angle with respect to the axis, each mark further characterized in that the mark corresponds to ultrasound measurements or test results during a pregnancy which are continuous variables dependent on corresponding gestational ages.