Neurosurgical microscopes

Where are neurosurgical microscopes used?

In neurosurgery, surgical microscopes are used for procedures including microsurgery of brain and skull base tumours, vascular procedures — aneurysm clipping, dissection of arteriovenous malformations and cerebral bypass surgery — as well as cranial nerve surgery and other procedures through deep approaches. Depending on the stage of the procedure, the surgeon moves from a wider view needed for orientation within the approach to higher magnification for microdissection, work on small vessels, clip placement or anastomosis.

During tumour surgery, the microscope provides a magnified view of the anatomy and the relationships between the lesion, vessels, nerves and surrounding tissues. Functional mapping, neuromonitoring and neuronavigation can provide additional information about tissue function and the position of the surgical field relative to imaging data. In selected procedures and configurations, fluorescence or intraoperative imaging can also contribute. These methods address different questions: neuronavigation relates position to imaging data, whereas fluorescence displays the signal from a specific marker.

The equipment required depends primarily on the types of procedures performed and the team’s working methods. One institution may need an assistant viewing system with extensive capabilities and video recording, while another may prioritise integration with navigation or selected fluorescence modules. Selection should therefore begin by defining the required functions and how they will be used during procedures.

Spine procedures have distinct requirements for microscope positioning over the table, arm reach and space for instruments, so we discuss them separately on the page about microscopes for spine surgery. If a single system is to serve several specialties, multidisciplinary surgical microscopes provide a starting point for comparison.

What matters when choosing a microscope for neurosurgery?

Optics and illumination of a deep surgical field

When working through a deep, narrow corridor, image detail and contrast, stereoscopic vision and even illumination at the required working distance matter. The useful magnification range should allow efficient transitions from orientation in a wider field to observation of fine details. As magnification increases, the field of view, depth of field and image brightness change, so these characteristics need to be assessed together. The focusing method, including its adjustment range and smoothness, is a separate criterion.

Viewing conditions are affected by the entire optical path: the objective, zoom system, eyepieces, tube and the way light is delivered to the microscope head. In systems equipped with an integrated camera or assistant view, the way the image is presented to the assistant and on monitors also needs to be considered. Assessment should therefore cover both the image in the surgeon’s eyepieces and its availability and quality in the other viewing paths used by the team.

Positioning, reach and freedom of movement

Arm reach and joint geometry determine the sides of the table from which the microscope head can be brought into position and how easily the viewing angle can be changed without moving the base. Movement should be smooth and predictable throughout the range used, and once locked, the system must hold the selected position without drift. Assessment should also consider the space available for the surgeon, assistant, monitors and other equipment around the table.

Balancing determines whether the arms and microscope head remain neutral when the brakes are released. A well-balanced system can be guided with little force, without a tendency to drop, rise or rotate on its own, making precise repositioning along successive viewing axes easier. With manual solutions, staff adjust the balance of individual axes, while assisted and automatic systems shorten this procedure and may compensate for the complete device configuration. Comparisons should establish which axes the mechanism covers and how rebalancing is performed after a configuration change.

Surgeon and assistant use, and controls

An adjustable tube allows the viewing height and angle to be adapted to the surgeon’s position. Depending on the system, the assistant can work from the side, opposite the surgeon in a face-to-face arrangement, or use the image on a monitor. Selection requires a distinction between an optical assistant viewing path, which may provide a stereoscopic image, and video viewing, as well as a check of the adjustments available at each viewing station.

Control handles, a foot control and — in selected systems — a mouth control distribute microscope operation across different interfaces. The brakes are released using the control handles and, in some configurations, an additional button intended for the assistant. The foot control may be used for functions such as magnification adjustment, focusing, illumination adjustment or XY control. Comparisons need to establish the functions assigned to each interface in the specific configuration.

Imaging and integration in selected configurations

Neurosurgical systems can combine the optical path with video images, navigation, fluorescence and image recording. Some solutions are integrated into the device, while others require specific modules, interfaces, cameras or software. When comparing configurations, it is therefore necessary to establish which functions are actually active, which components they work with and the extent to which they can be used.

Selected neurosurgical microscope models

Neurosurgical systems include both conventional optical platforms combined with different stands and integrated devices equipped with imaging, image recording and navigation. The models below represent these different designs and equipment generations. Each description is limited to features confirmed for the relevant family or specified variant.

• ZEISS OPMI Vario — a system with apochromatic optics and motorised magnification adjustment and focusing, used in neurosurgery among other specialties. It was offered with S8, S81 and S88 stands, which differ in suspension design, illumination and equipment.
• Leica M525 — a family of neurosurgical and multidisciplinary systems based on a microscope head with the OptiChrome optical system and motorised adjustment of magnification and working distance. The F20, F40, F50 and OH4 variants differ in suspension system, light source and degree of integration; fluorescence modules and image injection apply only to selected configurations.
• Leica M520 — a surgical microscope used in neurosurgery, equipped with the OptiChrome optical system, a motorised 1:6 zoom and working distance adjustment over a range of 207–470 mm. Balancing and positioning, the type of illumination, and the availability of an assistant view and image integration modules depend on the suspension system and complete configuration.
• ZEISS OPMI Vario 700 — a multidisciplinary system with apochromatic optics and a working distance range of 200–500 mm, allowing the space between the microscope head and surgical field to be adjusted. Selected configurations may include SpeedFocus, AutoBalance, an XY system, HD imaging and a navigation interface.
• Möller-Wedel Hi-R 1000 — a system with apochromatic optics whose confirmed intended applications include neurosurgery. The documented 20-1000 configuration with the FS4-20 stand incorporates PermaBalance, SensoServo and a modular system providing an assistant view; these solutions apply to that set, rather than every Hi-R 1000 version.
• ZEISS OPMI Pentero — an integrated neurosurgical system with automatic balancing, a video system and MultiVision for displaying additional data. In selected configurations, the system could be equipped with IR800, FLOW800 or BLUE 400 modules.

Models from these brands are also presented on the manufacturer pages: ZEISS microscopes, Leica microscopes and Haag-Streit / Möller-Wedel microscopes.

Buying a neurosurgical microscope

What determines the price of a neurosurgical microscope?

The price of a neurosurgical microscope depends primarily on the model and system generation, suspension design and range of integrated functions. The configuration of the optical path and assistant view, light source, camera, monitors, navigation or fluorescence modules and other accessories also matter.

When comparing offers, complete systems should be considered together with the stand, assistant view, video equipment and integration modules. The microscopes shown in the list are offered in the configurations described on their individual product pages, with prices available on request. For a model not currently shown on the website, you can contact Medical Elektro.

Refurbished neurosurgical microscopes at Medical Elektro

Assessment of a used neurosurgical system should cover the quality of the optical path and illumination, smooth movement in all axes, and the operation of the brakes and balancing mechanism. Motorised functions, the assistant view, camera, monitors and installed imaging modules require separate checks. The scope of testing should correspond to the equipment fitted to the individual unit.

At Medical Elektro, we offer refurbished surgical microscopes. The work required depends on the condition and configuration of the individual unit. Each unit offered has its own photographs and technical description showing its actual configuration. We present the successive stages of preparation on the page about the surgical microscope refurbishment process. The devices offered are covered by a 12-month warranty.

The configurations of the devices offered are shown in the product list above. To obtain a price for a selected microscope or enquire about a model not currently shown on the website, contact Medical Elektro.