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US3587588A - Cervix dilating instrument and method - Google Patents
Fonseca 2. Fernandes 1. Souza-Fabjan 1. In Experiment 1, thirty ewes underwent four epidural treatments.
A major limitation in the application of assisted reproductive technologies in sheep arises from the inability to easily traverse the uterine cervix. The cervix of the non-pregnant ewe is a narrow and rigid structure, with 5—7 spiral folds and crypts that block its lumen. The first two folds closest to the vagina appear to be the greatest obstacle for the instrument insertion into the sheep cervix. Therefore, the dilation of the distal part of the cervix could provide the conformational change necessary to perform non-invasive transcervical procedures.