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Hegar Uterine Dilator Double End 11mm/12mm, Length 20.5cm, Net Weight 1.42 oz. Hegar Double-Ended Uterine Dilator is a manual, probe-style instrument used to dilate the cervix. They are solid, nonflexible, and available in multiple diameters. These dilators are slightly curved in opposite directions from the center and have smooth, rounded tips. This product is the 11mm/12mm dilator. Hegar introduced the dilators in 1879. Hegar dilators are widely used in gynecology to open up the cervix. This may be necessary prior to a uterine curettage or biopsy. They have also found application in the management of vaginismus or hymenal stenosis. They are also used to overcome stenosis in non-gynecological situations, such as in urology and proctology.