Hysteroscope Types and Sizes: A Buyer's Selection Guide

The main hysteroscope types

Instruments are normally grouped by purpose. A diagnostic hysteroscope is a narrow telescope with a sheath for distension medium, used to inspect the cavity and take simple samples. An operative hysteroscope adds a working channel or a larger sheath so that scissors, graspers, electrodes or a resectoscope loop can be passed.

Mechanically, rigid telescopes dominate because they offer the best image and are autoclavable, while flexible hysteroscopes are used where a steerable tip helps, at the cost of a smaller channel and more demanding reprocessing. Many services keep a rigid set as the workhorse and add a second tier for operative work.

• Diagnostic: smallest diameter, inspection and biopsy
• Office (outpatient) systems: slim, continuous flow, 5 Fr channel, see the Bettocchi concept
• Operative: larger sheath, resectoscope or mechanical tissue removal
• Flexible: steerable tip, limited channel, specialised reprocessing

Hysteroscope sizes: what the numbers mean

The size of a hysteroscope is described by several different numbers, and quotations often mix them. The telescope (optic) diameter is typically in the 2.7 to 4 mm range; the outer sheath diameter, which determines cervical dilation, runs from about 3 mm for diagnostic sheaths to 7 or 8 mm for operative sheaths; the working channel is given in French size, for example 5 Fr.

One French unit equals one third of a millimetre, so 21 Fr is 7 mm. When comparing the size of a hysteroscope between offers, always compare the sheath outer diameter and the channel size, not only the telescope.

Viewing angle: 0, 12 or 30 degrees

A 0 degree optic gives a straight-ahead view and is easiest for orientation. A 12 degree optic is common in operative sets because it keeps the working instrument in view while offering a slightly offset field. A 30 degree optic widens the field when the scope is rotated and helps to inspect the tubal ostia and cornua in diagnostic work.

Operative resectoscopes frequently pair a 12 degree telescope with the sheath, for example the 2.7 mm, 12 degree PANOVIEW telescope in the Richard Wolf Princess resectoscope, a slim 7 mm (21 Fr) hybrid instrument for monopolar and bipolar use.

Diagnostic hysteroscopy versus operative hysteroscopy kit

Hysteroscopy diagnostics need a good optic, a bright light source, a camera and a distension system. Operative hysteroscopy adds an energy source and a fluid-balance strategy: see the operative hysteroscopy equipment guide and the note on fluid management and pumps.

Types of hysteroscopy differ in setting as well as hardware. Outpatient work favours small diameters and minimal dilation; theatre work can use larger sheaths and electrosurgery, usually with analgesia or anaesthesia chosen by the clinician.

How to pick the right set

Start with your case mix and volume: if most cases are diagnostic with simple biopsy, a slim continuous-flow set is sufficient. If polyps and fibroids are planned, include a resectoscope and a generator such as the Richard Wolf HF-GENERATOR 2260 or similar.

Also check camera compatibility, autoclavability of the optic, availability of repairs and training. Beckfinity specialists can help you configure a hysteroscopy tower; contact us to request a quote or consultation.