Dilator Set

Quick Answer: A dilator set is a series of smooth metal rods of increasing diameter, used to open the cervical canal step by step before instruments are passed into the uterus. The image file name refers to Hegar dilators, the most widely taught pattern.

Stepwise Dilation With Graded Rods

The cervix can only be opened safely in small steps. Graded dilators make that possible: each rod is slightly wider than the last, and they are passed in order until the canal is wide enough for the next instrument. Hegar dilators are solid, straight or gently curved rods with rounded ends, sized by their diameter in millimetres, and double-ended Hegar sets carry a different size at each end. Tapered patterns such as the Hawkin-Ambler and Pratt dilators are also found in gynaecology trays.

Neither the number of dilators nor the size range is given in the listing, and such sets are sold in several ranges, so state the sizes your tray or teaching programme requires.

In teaching, the set belongs to dilation and curettage and evacuation trays. On pelvic models, students learn to hold each rod with a light grip, follow the direction of the uterus and never force a size. Viva questions often ask students to name the pattern and explain how the sizes are marked. LabEquip supplies the set for education and makes no claim of regulatory approval for clinical use.

Specifications

Applications

• Instrument identification in gynaecology teaching and examinations
• Practising graded cervical dilation on pelvic task trainers
• Completing a D&C set or evacuation tray for skills-lab use
• Lectures comparing solid Hegar rods with tapered dilator patterns

Care & Handling

• Clean each dilator soon after use and check the rounded ends for scratches or pitting.
• Keep the set in a rack or case with a slot for every size, so a missing rod is noticed and the sizes stay in order.
• Steam-sterilise stainless steel dilators after cleaning and dry them before storage.

Why Choose LabEquip

Dilator sets are ordered by gynaecology departments, nursing and midwifery colleges and hospital skills labs, often together with uterine curettes. LabEquip lists the set in its Biology Lab Products range.

Frequently Asked Questions

How should a dilator be held during dilation?

Lightly, between the thumb and fingers like a pen, with a finger resting along the shaft to limit how far it can advance. A light grip lets the operator feel resistance and stop instead of forcing the rod.

How are Hegar dilator sizes marked?

Each dilator is marked with its diameter in millimetres. In a double-ended set, each end carries a different size, so one instrument covers two steps.

Why is dilation done in small steps?

Stretching the cervix gradually reduces the risk of tearing it or creating a false passage, which is more likely when a large rod is forced.

What is the difference between Hegar and Hawkin-Ambler dilators?

Hegar dilators have a nearly uniform diameter along their length and a rounded end. Hawkin-Ambler dilators are tapered, so the diameter increases gradually along the rod.

Where does the dilator set fit in a D and C?

After the uterine sound has measured the depth and direction of the cavity, and before the curette or ovum forceps are passed.

Can dilators be used on a pelvic model?

Yes. Teaching models with a cervical opening let students practise holding the dilator lightly, following the uterine axis and working up through the sizes.

Last Updated: September 2026