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Commercially available Hegar dilators are commonly sold in sets of 8, 10, or 14 individual rods. [7] Each set includes a range of sizes, popularly from 3 mm to 17 mm for single-ended dilators or 3 mm / 4 mm to 17 mm / 18 mm for double-ended dilators, though configurations with sizes anywhere from 1 mm to 26 mm do exist. [8] [9]
Over time, the osmotic dilator absorbs fluid and swells to 3-4 times the initial diameter. [9] Most of the increase in size occurs within 6 hours after the dilator are placed in the cervix, though further expansion will continue over 12–24 hours. [7] The number of osmotic dilators placed depends on the degree of cervical dilation that is sought.
Cervical dilation (or cervical dilatation) is the opening of the cervix, the entrance to the uterus, during childbirth, miscarriage, induced abortion, or gynecological surgery. Cervical dilation may occur naturally, or may be induced surgically or medically.
Tropicamide, sold under the brand name Mydriacyl among others, is a medication used to dilate the pupil and help with examination of the eye. [3] Specifically it is used to help examine the back of the eye. [4] It is applied as eye drops. [3] Effects occur within 40 minutes and last for up to a day. [3]
Normal blood vessel (left) vs. vasodilation (right) Vasodilation, also known as vasorelaxation, is the widening of blood vessels. [1] It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins, large arteries, and smaller arterioles. [2]
Dilation acts should not cause pain or bleeding. [10] Dilatation with rigid dilators must be done carefully as vaginal perforation and urethral injury may occur. [ 11 ] [ 12 ] There is no consensus on the frequency and duration of using vaginal dilators. [ 13 ]
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Dilation (operator theory), a dilation of an operator on a Hilbert space; Dilation (morphology), an operation in mathematical morphology; Scaling (geometry), including: Homogeneous dilation , the scalar multiplication operator on a vector space or affine space; Inhomogeneous dilation, where scale factors may differ in different directions