Leica Microsystems M844
Leica Microsystems · Model M844
Leica Optics have superior light gathering ability. Sharp, brilliant, true anatomical color images with excellent depth of field are obtained under limited or even no microscope illumination. The result: better detail recognition, added patient safety, and fatigue-free viewing for the surgeon. QuadZoom: The teaching solution Only Leica's QuadZoom technology features four separate beam paths in the same zoom system. No manual adjustment by the teacher is necessary. Leica's Double Wing furthermore allows two students/assistants to have full stereo view at the same magnification. Work in comfort The Leica M844 F40 offers various features to enhance the surgeon's and assistant's comfort and to support an ergonomical workflow. For example: individually adjustable binocular tubes such as the UltraLow II binocular tubes, Leica Wireless Footswitch, Two-in-One display, StepCycle, and Auto Reset function. High-definition documentation The Med X Change HDMD All-in-One (AIO), a compact, integrated HD digital recording system, provides stunning, high-quality videos, and still images. The system is exclusively available from Leica Microsystems. Additionally, surgical cases can be wirelessly transfered to an Apple device with Med X Mobile. Integration of retinal accessories Leica Microsystems' surgical microscopes are designed to integrate the most commonly used wide-angle observation systems and stereo image inverters. They are also provided with a quick mount interface to comfortably and quickly install and remove e.g. the Leica slit lamp. True Red Reflex The double beam stereo illumination and Leica's large OttoFlex II illumination diameter enable true three-dimensional vision, and better Red Reflex stability and brightness. The result: increased depth of field, less XY-centering and refocusing required, brightness adjustable where it is needed most.
Key tips
- ·Never defeat or bypass a return-electrode monitoring (REM) alarm to finish a case - it's a direct burn risk.
- ·Verify OR table battery backup - a table that loses power mid-procedure is a real, documented incident type.
- ·Track surgical light lamp-hours rather than waiting for failure - a sudden failure mid-case is avoidable.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Electrosurgical electrode wear
MediumSymptoms: Poor cut/coag, sparking, low power.
Root cause: Burned/eroded blade or pencil.
Instrument / implant breakage
HighSymptoms: Fractured tip, loose component, debris.
Root cause: Metal fatigue, improper reprocessing, or misuse.
Reprocessing / sterilization failure
MediumSymptoms: Residue, bioburden, discoloration.
Root cause: Inadequate cleaning cycle or damaged tray.
Table hydraulic / actuator fault
MediumSymptoms: Slow or drifting positioning.
Root cause: Cylinder seal or actuator wear.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
Instrument repair / replacement set
High-turnover consumable instruments.
Class Periodic replacementRel. cost $$R&R Fairly easy
Electrosurgical pencil & electrode
Consumable per procedure.
Class ConsumableRel. cost $R&R Easy
Return electrode (patient plate)
Single-use; expiry critical.
Class ConsumableRel. cost $R&R Easy
Foot switch assembly
Class Periodic replacementRel. cost $$R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Instrument repair / replacement set High-turnover consumable instruments. | Periodic replacement | $$ | Fairly easy |
| Electrosurgical pencil & electrode Consumable per procedure. | Consumable | $ | Easy |
| Return electrode (patient plate) Single-use; expiry critical. | Consumable | $ | Easy |
| Foot switch assembly | Periodic replacement | $$ | Fairly easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Pre-case functional check
- ·Electrosurgical return-electrode cable inspection
- ·Table hydraulic / mechanical inspection
- ·Annual electrical safety test and full PM
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Electrosurgical electrode wear
- Confirm the presentation - typically poor cut/coag, sparking, low power - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: burned/eroded blade or pencil.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the electrosurgical pencil & electrode per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Return electrode / pad fault
- Confirm the presentation - typically pad alarm, no activation - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: poor contact or expired pad.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the return electrode (patient plate) per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Technical Specs
- Field of view
- 7 to 80 mm
- Focus range
- 54mm
- Focusing
- Motorized
- Magnification
- 6:1
- Magnification Range
- 3.5× – 21× WD 175mm, 10× eyepieces
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Operating rooms
- Procedure rooms
- Interventional suites
Documents & Manuals
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