Leica M841

Leica M841 – model overview

The Leica M841 is an ophthalmic surgical microscope intended for ophthalmic surgery. It belongs to the Leica microscope portfolio and uses the QuadZoom system with four light paths and Leica OptiChrome optics. The system provides a stereoscopic image for the surgeon and assistant, while the main illumination and separate OttoFlex module support observation of the surgical field and the generation of a red reflex.

The motorized 6:1 zoom allows continuously variable magnification. Focusing has a range of 45 mm, and the XY module moves the optical axis over a range of 58 × 58 mm without repositioning the suspension system. The motorized head tilt mechanism, with a range from +15° to −95°, allows the viewing direction to be adjusted to the position of the surgical field.

The Leica M841 is available in mobile and ceiling-mounted configurations. Individual units may differ in their suspension system, objective, binocular tube, assistant view, controls and image recording equipment. The description and photographs of each unit show its actual configuration.

Use of the Leica M841 in ophthalmology

The Leica M841 is intended for ophthalmic procedures that require stereoscopic observation of the surgical field by the surgeon and assistant. The QuadZoom system separates the image into four light paths, giving both observers a full stereoscopic image. The model belongs to the ophthalmic microscope category and can be configured to suit the workspace arrangement and the method of shared observation.

Motorized focusing, the XY module and the head tilt mechanism allow the focus, optical axis position and viewing direction to be adjusted using the microscope controls. This allows the optical system to be positioned relative to the working field without having to move the entire suspension system each time.

Main illumination, OttoFlex and the red reflex

The Leica M841 uses integrated main illumination and a separate OttoFlex module. The two systems are controlled independently. The main illumination comprises two 12 V / 50 W halogen lamps with a quick-change mechanism and IR and UV filters. The OttoFlex module has its own 12 V / 50 W halogen lamp and generates the red reflex.

Separate OttoFlex adjustment allows the intensity of the red reflex to be set independently of the main illumination. The function also supports observation with a small pupil and during advanced cataract procedures.

Key technical data of the Leica M841

QuadZoom, OptiChrome and optical parameters

The Leica QuadZoom system uses four independent light paths. The surgeon and assistant receive a full stereoscopic image without dividing brightness between the two viewing positions. Leica OptiChrome optics work with the system throughout the magnification range.

The motorized zoom has a 6:1 ratio. With an f = 200 mm (WD 175 mm) objective and 10× eyepieces, the system provides magnification from 3.5× to 21×. The field of view diameter ranges from 8 to 75 mm. Depending on the required configuration, the Leica M841 can be used with an f = 200 mm (WD 175 mm), f = 225 mm (WD 200 mm) or f = 250 mm (WD 225 mm) objective.

Positioning and controls

Motorized focusing has a range of 45 mm. The XY module moves the optical axis over an area of 58 × 58 mm, allowing the image position to be adjusted without moving the base or the system arm. Both mechanisms have an automatic position reset function.

The motorized head tilt mechanism operates over a range from +15° to −95°. It allows the optical axis to be directed relative to the surgical field while keeping the suspension system in position.

The control unit operates the microscope drives and the independent settings for the main illumination and OttoFlex. System functions are controlled using a 12-function foot control or hand control, allowing basic adjustments without reaching for the microscope head.

Leica M841 configurations and suspension systems

The Leica M841 forms a complete surgical system when its optical module is combined with a suitable suspension system and equipment. The family includes mobile and ceiling-mounted configurations. The M841 optical core is common to these configurations, while positioning, balancing and movement locking depend on the suspension system used.

Mobile variants

The standard mobile variant uses a mobile base that allows the complete system to be moved between workstations and positioned at the surgical field.

The Leica M841 EBS combines the same optical core with a mobile system featuring electromagnetic brakes and semi-automatic balancing. This arrangement supports positioning the arm and locking its movements once the required position has been reached.

Ceiling-mounted systems

The Leica M841 is also available as a Ceiling Mount and in C40, Telescope Mount and Mini Mount configurations. These systems differ in their arm construction and the way the microscope is positioned, allowing the configuration to be adapted to the space available in the operating room and the workspace arrangement.

A ceiling mounting eliminates the mobile base and leaves free floor space around the surgical field. This makes the workspace easier to access from different sides, while a suitable arm allows the microscope to be brought over the working field and moved away after use. The equipment, range of movement and controls of a particular system depend on the selected configuration.

Assistant view, image recording and additional equipment

The Leica M841 can be equipped with a 0° assistant view that provides a second stereoscopic viewing position. The configuration can be extended with a double wing for a third observer or a beam splitter for connecting an additional optical path. The choice of components depends on the required number of viewing positions and the arrangement of the complete system.

Image recording can use a suitable video or still camera connected to the optical path through an adapter and beam splitter. An individual unit may therefore be equipped with an assistant view alone, an assistant view with image recording, or an extended shared observation arrangement.

In ophthalmic configurations, the Leica M841 is also compatible with BIOM 4m systems and SDI 4e and SDI 4m modules. These are optional components of the complete system, so their presence is indicated by the description and photographs of the individual unit.

Leica M841 and Leica M844

The Leica M841 and Leica M844 use the QuadZoom system with four light paths, providing stereoscopic observation for the surgeon and assistant. However, the models differ in their motorized movement ranges and the design of the red reflex module.

The Leica M841 has a focusing range of 45 mm, and its motorized head tilt operates from +15° to −95°. The Leica M844 has a focusing range of 54 mm and a head tilt range from +15° to −50°. The M841 uses a separate OttoFlex module, while the M844 is equipped with OttoFlex II. Comparing these parameters helps match the model to the required adjustment range and illumination configuration.

What determines the price of a used Leica M841 microscope?

On the second-hand market, the price of a used Leica M841 microscope depends on the technical condition, completeness and configuration of the individual unit, including the suspension system, optics, assistant view, controls, and equipment for posterior segment observation and image recording. At Medical Elektro, the level of preparation is neither an option within the offer nor a factor differentiating the price, because every unit offered undergoes the same refurbishment standard. The price is determined individually for the complete configuration.

Refurbished Leica M841 microscopes at Medical Elektro

The term “used” refers to a microscope with a history of use. A refurbished surgical microscope is a used device that undergoes a multi-stage preparation process before sale.

Refurbishment at Medical Elektro follows one standard that applies to the complete configuration of each individual unit. For the Leica M841, it covers the complete microscope with the appropriate suspension system and its actual optical, observation, illumination, control and image recording equipment. Each refurbished unit has its own photographs and a description matching its configuration, and is covered by a 12-month warranty. The detailed scope is presented on the surgical microscope refurbishment process page.

Availability of Leica M841 microscopes

The list of Leica M841 units is updated automatically. Information about availability, the suspension system, optical configuration, assistant view, controls and equipment is provided for each unit.

Contact Medical Elektro for assistance with selecting a Leica M841, information about the equipment of available units and an individual quotation.