The Anatomy of a Rigid Hysteroscope: What Each Part Does

Hysteroscope parts name by name: the telescope

The telescope is the optical core. It is a slim rigid rod containing the lenses that carry the image from the tip to the eyepiece or camera, surrounded by optical fibres that bring light from the light post to the tip. The eyepiece at the proximal end connects to the camera head. The telescope itself does not carry fluid; that is the job of the sheath around it.

The key properties are the outer diameter, the viewing angle and the image quality. For example, the Richard Wolf Princess uses a PANOVIEW telescope of 2.7 mm with a 12 degree direction of view, according to the manufacturer. Small diameters make the entry easier, but they also limit how much light the fibres can carry.

Optic angle and field of view

The optic angle is the offset of the direction of view from the axis of the instrument. A 0 degree telescope looks straight ahead; 12 or 30 degree telescopes look slightly to one side, which helps the surgeon see the tubal ostia and the lateral walls by rotating the telescope. Foreoblique optics with a small angle are common in operative systems because the instruments pass in the same line of sight.

When you read a specification, note the angle together with the diameter, because a larger angle is a trade-off between ease of orientation and the position of the instrument in the picture. Ask also about the field of view and the depth of focus.

Hysteroscope sheath: inner and outer

The hysteroscope sheath is a tube around the telescope that provides channels for fluid. In a continuous-flow design there are two sheaths: an inner sheath, which carries the inflow, and an outer sheath, which carries the outflow. The fluid enters through the inner channel, fills the cavity and is returned through the outer, so the view stays clear and the pressure is controlled.

Diagnostic sheaths contain only these channels. Operative sheaths add a working channel for instruments or a different arrangement for a resectoscope. The Princess has a rotating double sheath: the working element can turn 360 degrees without moving the outer sheath, and it can be expanded from 7 mm (21 Fr) to 8 mm. Our article on hysteroscope types and sizes compares the variants.

• Inner sheath: inflow
• Outer sheath: outflow
• Working channel: scissors, grasping forceps, electrodes
• Diagnostic or operative configuration

Working channel, ports and light post

The working channel is a lumen along the length of the sheath through which semi-rigid or flexible instruments pass. It has a seal at the proximal end to prevent leakage of fluid. Inflow and outflow ports are fitted with taps, to which tubing is attached. The light post is the metal connector on the side of the telescope where the light cable is plugged in.

A quick-release mechanism, such as the E-line mechanism on the Princess, assembles and disassembles the instrument without tools. Easy disassembly is important for cleaning; our note on hysteroscope cleaning and reprocessing covers what to look for.

Why parts matter when you buy

Ask what comes in the standard set: how many telescopes, which angles, which sheaths, and whether parts from other sets are interchangeable. A modular system lets a clinic start with diagnostic sheaths and add operative parts later. For a resectoscope example see Princess, and for the application see the article about the Princess resectoscope.

To discuss a hysteroscope configuration, contact Beckfinity's specialists.