Leica M844 User manual

MEDICAL DIVISION
User Manual
10 713 294 - Version 01
M

II M844 / Ref. 10 713 294 / Version 01
Thank you for purchasing a Leica surgical microscope system.
In developing our systems, we have placed great emphasis on simple, self-
explanatory operation. Nevertheless, we suggest studying this user manual in
detail in order to utilize all the benefits of your new surgical microscope.
For valuable information about Leica Microsystems products and services, and the
address of your nearest Leica representative, please visit our website:
www.leica-microsystems.com
Thank you for choosing our products. We hope that you will enjoy the quality and
performance of your Leica Microsystems surgical microscope.
Leica Microsystems (Schweiz) AG Medical Division
Max-Schmidheiny-Strasse 201 CH-9435 Heerbrugg
Tel.: [phone]
Fax: [phone]
Legal disclaimer
All specifications are subject to change without notice.
The information provided by this manual is directly related to the operation of the
equipment. Medical decision remains the responsibility of the clinician.
Leica Microsystems has made every effort to provide a complete and clear user
manual highlighting the key areas of product use. Should additional information
regarding the use of the product be required, please contact your local Leica
representative.
You should never use a medical product of Leica Microsystems without the full
understanding of the use and the performance of the product.
Liability
For our liability, please see our standard sales terms and conditions. Nothing in this
disclaimer will limit any of our liabilities in any way that is not permitted under
applicable law, or exclude any of our liabilities that may not be excluded under
applicable law.

M844 / Ref. 10 713 294 / Version 01 1
Contents
1 Introduction 3
1.1 About this user manual 3
1.2 Symbols in this user manual 3
2 Product identification 3
2.1 Optional product features 3
3 Safety notes 4
3.1 Intended use 4
3.2 Indication for Use 4
3.3 Contraindications 4
3.4 Directions for the person responsible for the
instrument 4
3.5 Directions for the operator of the instrument 5
3.6 Dangers of use 6
3.7 Signs and labels 10
4 Design 15
4.1 Leica M844 F40 15
4.2 Leica M844 F20 17
4.3 Leica M844 CT40 19
4.4 Leica M844 Optics carrier 21
5 Functions 22
5.1 Illumination 22
5.2 Balancing system 22
5.3 Electromagnetic brakes 22
6 Controls 23
6.1 Control unit 23
6.2 Leica M844 surgical microscopes 24
6.3 Footswitch and handles 25
7 Preparation before surgery 26
7.1 Transportation 26
7.2 Installing optical accessories 27
7.3 Setting the binocular tube 28
7.4 Adjusting the eyepiece 28
7.5 Adjusting optical accessories for LeicaM844 29
7.6 Installing documentation accessories 30
7.7 Selecting documentation accessories 31
7.8 Fitting optical accessories for Leica M844 32
7.9 Fitting the Leica Slit Illuminator 33
7.10 Wide-angle observation system (such as Oculus) 36
7.11 Stand settings (F40, CT40) 37
7.12 Stand settings (F20) 39
7.13 Positioning at the operating table 39
7.14 Attaching sterile controls and drape 40
7.15 Function check 41
8 Operation 42
8.1 Switching the microscope on 42
8.2 Positioning the microscope 43
8.3 Adjusting the microscope 44
8.4 Adjusting the magnification (zoom) 46
8.5 Transport position 47
8.6 Rest position 47
8.7 Shutting down the surgical microscope 47
9 Touch panel 47
9.1 Menu structure 47
9.2 Switching the microscope on 47
9.3 Editing the user list 49
9.4 Configuring users (User Settings menu) 49
9.5 StepCycle™ 52
9.6 The Maintenance menu 55
9.7 The "How to…" menu 56
9.8 The "Service" menu 56
10 Accessories 57
10.1 Devices and accessories manufactured by Leica 57
10.2 Devices and accessories of Leica and of 3rd party
manufacturers 60
10.3 Video accessories for M844 60
10.4 Drapes 60
11 Care and maintenance 61
11.1 Maintenance instructions 61
11.2 Cleaning the touch panel 61
11.3 Maintenance 61
11.4 Care and Maintenance of the Leica Foot switch 61
11.5 Changing fuses 62
11.6 Changing lamps 62
11.7 Notes on reprocessing of resterilizable products 63
12 Disposal 66
13 What to do if ...? 66
13.1 General 66
13.2 Microscope 66
13.3 Control unit 67
13.4 Error messages on the control unit 68
13.5 F40 stand 68
13.6 CT40 ceiling mount 68
13.7 F20 stand 68
13.8 Camera, video 69
14 Specifications 70
14.1 Microscope 70
14.2 Illumination 70
14.3 Accessories 70
14.4 Electrical data 71

2 M844 / Ref. 10 713 294 / Version 01
14.5 Auxiliary power socket 71
14.6 Optical data 71
14.7 Stands 72
14.8 Ambient conditions 72
14.9 Electromagnetic compatibility (EMC) 73
14.10 Standards fulfilled 73
14.11 Configurations and Weights 73
14.12 Limitations of use 74
14.13 List of weights of balanceable configurations 76
14.14 Dimensional drawings 78
15 Annex 81
15.1 Checklist before the operation 81
This manual covers the following systems:
• M844 F40
• M844 F20
• M844 CT40

Introduction
M844 / Ref. 10 713 294 / Version 01 3
1 Introduction
1.1 About this user manual
In this user manual the surgical microscope M844 is described.
In addition to notes on the use of the instruments
this user manual gives important safety information
(see chapter 3).
X Read this user manual carefully before operating
the product.
1.2 Symbols in this user manual
The symbols used in this user manual have the following meaning:
Symbol Warning
word
Meaning
Warning
Indicates a potentially hazardous situation
or improper use that could result in serious
personal injuries or death.
Caution
Indicates a potentially hazardous situation
or improper use which, if not avoided,
may result in minor or moderate injury.
Note
Indicates a potentially hazardous situation
or improper use which, if not avoided, may
result in appreciable material, financial
and environmental damage.
Information about use that helps the user
to employ the product in a technically
correct and efficient way.
X Action required; this symbol indicates that
you need to perform a specific action or
series of actions.
Technical documentation and Assembly instruction
The Technical documentation is part of the document “Assembly
instruction”.
2 Product identification
The model and serial numbers of your product are located on the
identification label on the illumination unit.
X Enter this data in your user manual and always refer to it when
you contact us or the service workshop regarding any questions
you may have.
Type Serial no.
... ...
2.1 Optional product features
Different product features and accessories are optionally available.
The availability varies from country to country and is subject to
local regulatory requirements. Please contact your local
representative for availability.

Safety notes
4 M844 / Ref. 10 713 294 / Version 01
3 Safety notes
The M844 surgical microscope is state-of-the-art technology.
Nevertheless, hazards can arise during operation.
X Always follow the instructions in this user manual, and in
particular the safety notes.
3.1 Intended use
• The M844 surgical microscope is an optical instrument for
improving the visibility of objects through magnification and
illumination. It can be applied for observation and
documentation and for human and veterinary medical
treatment.
• The M844 surgical microscope may be used only in closed
rooms and must be placed on a solid floor.
• The M844 surgical microscope is subject to special
precautionary measures for electromagnetic compatibility.
• Portable and mobile as well as stationary RF communications
equipment can have a negative effect on the reliability of the
M844 surgical microscope's functionality.
• The M844 is intended for professional use only.
3.2 Indication for Use
• The M844 surgical microscope is suitable for ophthalmic
application such as Retina, Cornea and Cataract surgery in
hospitals, clinics or other human medical instituations.
• The M844 surgical microscope may only be used in closed
rooms and must be placed on a solid floor or mounted to the
ceiling.
• These Instructions for Use are intended for physicians, nurses
and other medical and technical staff who prepare, operate or
maintain the device after appropriate training. It is the duty of
the device owner/operator to train and brief all the operating
personnel.
3.3 Contraindications
No known contraindications for Use.
3.4 Directions for the person
responsible for the instrument
X Ensure that the M844 surgical microscope is used only by
persons qualified to do so.
X The M844 surgical microscope may only be operated by trained
personnel.
X Ensure that this user manual is always available at the place
where the M844 surgical microscope is in use.
X Carry out regular inspections to make certain that the
authorized users are adhering to safety requirements.
X When instructing new users, do so thoroughly and explain the
meanings of the warning signs and messages.
X Allocate responsibilities for commissioning, operation and
maintenance. Monitor compliance with this.
X Only use the M844 surgical microscope when it is free of
defects.
X Inform your Leica representative or Leica Microsystems
(Schweiz) AG, Medical Division, 9435 Heerbrugg, Switzerland,
immediately about any product defect that could potentially
cause injury or harm.
X If you use accessories from other manufacturers with the M844
surgical microscope, make sure that these manufacturers
confirm that the combination is safe to use. Follow the
instructions in the user manual for those accessories.
• Only the following accessories may be used with the Leica M844
surgical microscope:
• The Leica Microsystems accessories described in chapter 10
this User Manual.
• Other accessories, provided that these have been expressly
approved by Leica as being technically safe in this context.
• Modifications to or service on the M844 surgical microscope
may be carried out only by technicians who are explicitly
authorized by Leica to do so.
• Only original Leica replacement parts may be used in servicing
the product.
• After service work or technical modifications, the device must
be readjusted in accordance with our technical specifications.
• If the instrument is modified or serviced by unauthorized
persons, is improperly maintained (as long as maintenance was
not carried out by us), or is handled improperly,
LeicaMicrosystems will not accept any liability.
• The effect of the surgical microscope on other instruments has
been tested as specified in EN 60601-1-2. The system passed the
emission and immunity test. Comply with the usual pre-
cautionary and safety measures relating to electromagnetic and
other forms of radiation
• The electric installation in the building must conform to the
national standard, e.g., current-operated ground leakage
protection (fault-current protection) is suggested.
• Like any other instrument in the operating theater, this system
may fail. Leica Microsystem (Schweiz) AG therefore
recommends that a backup system is kept available during the
operation.
• Only the supplied power cord may be used.
• The power cord must have a protective conductor and must be
undamaged.
• The mains cable must be mechanically secured with the "Power
Input" socket to prevent accidental disconnection.
• The Leica Microsystems surgical microscope may be used only
by physicians and medical assistance personnel with

Safety notes
M844 / Ref. 10 713 294 / Version 01 5
appropriate qualifications who have been instructed in the use
of the instrument. Specific training is not required.
• Connecting electrical equipment to the Auxiliary Power outlet
will result in the establishment of a “ME System” and may result
in a reduced level of safety. The corresponding standard
requirements for “ME Systems” must be observed.
• All parts of the M844 shall not be serviced or maintained while
in use with a patient.
• Lamps shall not be changed while in use with a patient.
• Use of this equipment adjacent to other equipment should be
avoided because it could result in improper operation. If such
use is necessary, this equipment and the other equipment
should be observed to verify that they are operating normally.
• Use of accessories and cables other than those specified or
provided by the manufacturer of his equipment could result in
increased electromagnetic emissions or decreased
electromagnetic immunity of this equipment and result in
improper operation.
• Portable RF communications equipment (including peripherals
such as antenna cables and external antennas) should be used
no closer than 30 cm (12 inches) to any part of the Leica M844,
including cables specified by the manufacturer. Otherwise,
degradation of the performance of this equipment could result.
Note:
The EMISSIONS characteristics of this equipment make it suitable
for use in industrial areas and hospitals (CISPR 11 class A). If it is
used in a residential environment (for which CISPR 11 class B is
normally required) this equipment might not offer adequate
protection to radio-frequency communication services. The user
might need to take mitigation measures, such as relocating or
re-orienting the equipment.
3.5 Directions for the operator of the
instrument
X Follow the instructions described here.
X Follow the instructions given by your employer regarding the
organization of work and safety at work.
X Check the illumination intensity before and during surgery.
X Don't move system without released brakes.
X Operate the system only with all equipment in its proper
position (all covers tted, doors closed).
Phototoxic damage to the retina during eye surgery
WARNING
Damage to the eyes due to prolonged exposure!
The light of the instrument may be harmful. Risk of eye
damage increases with the duration of exposure.
X During exposure to the light from this instrument, do
not exceed the hazard reference values.
If the exposure time exceeds 2 min with this instrument
at maximum output power, the hazard reference value
will be exceeded.
The following table is intended to serve as a guideline and make
the surgeon aware of the potential hazard. The data have been
calculated for the worst-case scenario:
• Eye with aphakia
• Completely unmoving eye (continuous irradiation of the same
region)
• Uninterrupted light exposure, e.g. no surgical instruments in
the eye
• Pupils dilated to 7 mm
The calculations are based on the corresponding ISO standards1) 2)
and the exposure limit values recommended in them. Published
literature shows that a moving eye may allow for increased time of
exposure 3).
Main light
Light setting
Recommended maximum exposure time according to 1)
[min.]
Without filter With GG435 filter With GG475 filter
25 % 55 min 1 h 4 min 3 h 3 min
50 % 12 min 15 min 44 min
75 % 4 min 5 min 17 min
100 % 2 min 2 min 8 min
10 % - Retina
Protection
Function
Active
3 h 19 min n/a n/a

Safety notes
6 M844 / Ref. 10 713 294 / Version 01
OttoFlex™ illuminator
Light setting
Recommended maximum exposure time according to1)
[min.]
Without filter
25 % 1 h 9 min
50 % 14 min
75 % 5 min
100 % 2 min
20 % - Retina
Protection
Function
Active
1 h 42 min
Sources:
1) DIN EN ISO 15004-2:2007 Ophthalmic instruments –
Fundamental requirements and test methods – Part 2: Light
hazard protection.
2) ISO 10936-2:2010 Optics and photonics – Operation
microscopes/Part 2: Light hazard from operation microscopes
used in ocular surgery.
3) David Sliney, Danielle Aron-Rosa, Francois DeLori, Franz
Fankhauser, Robert Landry, Martin Mainster, John Marshall,
Bernhard Rassow, Bruce Stuck, Stephen Trokel, Teresa Motz
West and Michael Wolffe, Adjustment of guidelines for
exposure of the eye to optical radiation from ocular
instruments: statement from a task group of the International
Commission on Non-Ionizing Radiation Protection (ICNIRP)
APPLIED OPTICS, Vol. 44, No. 11, p. 2162 (10 April 2005).
Protect the patient with the following safeguards:
• Short illumination times
• Low brightness setting
• Use of protective filters
• Switching off the illumination during breaks in the operation
It is recommended to adjust the brightness to the minimum
necessary for the surgery. Infants, patients with aphakia (whose
eyelens has not been replaced by an artificial lens with a UV
protection screen), small children and persons with diseases of the
eye are at greater risk. The risk is also increased if the person being
treated or operated on has, within the last 24 hours, already been
exposed to illumination from the same or any other
ophthalmological instrument that uses a bright visible light source.
This applies especially to patients that have been examined via
retinal photography.
The decision about which light intensity to use for an application
must be made on a case-by-case basis. In any event, the surgeon
must evaluate the risks and benefits of the used light intensity.
Despite all efforts to minimize the risk of retinal injury by surgical
microscopes, damage may still occur. Photochemical retinal
damage is a possible complication of the necessity to use bright
light to make eye structures visible during difficult
ophthalmological processes.
In addition, the Retina Protection function can be activated during
the surgery to reduce the main light intensity up to 10% and
OttoFlex up to 20%.
Stability (floor stands only)
When moved in the operating room, the swing arm must be folded
up and locked and the brakes must be applied, otherwise the swing
arm could drift out of control and the stand could topple.
Hazards due to movable parts
This section describes uses that, inadvertently, could lead to
hazardous situations.
• Add accessories and balance the stand before the operation,
and never over the field of operation.
• Never put your hand between the gas spring and the swing
arm; it could become trapped when the swing arm is moved.
• Do not put your fingers between the microscope and the
focusing drive; They could get crushed.
Floor stand
• Always push the instrument to move it; never pull it. Feet in
lightweight shoes could become trapped beneath the casing of
the base.
• The footbrakes must remain engaged throughout the
operation.
Electrical connections
The control unit may be opened only by a Leica-approved service
technician.
Accessories
Only the following accessories may be used with the Leica M844
surgical microscopes:
• The Leica Microsystems accessories described in this User
Manual.
• Other accessories, provided that these have been expressly
approved by Leica as being technically safe in this context.
3.6 Dangers of use
WARNING
Danger of injury due to:
• uncontrolled lateral movement of the arm system,
• tilting of the stand,
• trapping of feet in lightweight shoes beneath the casing
of the base.
X For transportation, always move the M844 surgical
microscope into the transport position.
X Never move the stand while the unit is extended.
X Never roll the stand or OP equipment over the cables
lying on the oor.
X Always push the M844 surgical microscope; never pull it.

Safety notes
M844 / Ref. 10 713 294 / Version 01 7
WARNING
Risk of injury due to downward movement of the surgical
microscope.
X Complete all preparations and adjustments to the stand
before the operation.
X Never change the accessories or attempt to rebalance
the microscope while it is above the eld of operation.
X Balance the M844 after re-equipping it.
X Do not release the brakes when the instrument is in an
unbalanced state.
X Before re-equipping during the operation, rst swing
the microscope away from the operating eld.
X After re-equipping, always rebalance the microscope on
the swing arm.
X Never carry out the balancing above the patient.
X See safety notes in user manual.
X Don't use the down / up movement of ceiling mount
when the microscope is over the patient.
WARNING
Burn hazard!
X The lamp housing and cover may become hot during
use.
WARNING
Danger of injury to the eyes due to possibly hazardous
optical infrared and UV radiation.
X Do not look at the operating lamp.
X Minimize exposure to eyes or skin.
X Use appropriate shielding.
WARNING
Danger of eye injuries!
The light source of the slit illuminator might be too bright
for the patient.
X Dim the slit illuminator before switching it on.
X Slowly increase the brightness until the image is
illuminated optimally for the operating doctor.
WARNING
Damage to the eyes due to prolonged exposure!
The light of the instrument may be harmful. Risk of eye
damage increases with the duration of exposure.
X During exposure to the light from this instrument, do
not exceed the hazard reference values.
An exposure to this instrument for longer than 2 min at
maximum output power exceeds the exposure limits.
WARNING
Risk of injury due to downward movement of the surgical
microscope!
X Never change the accessories or attempt to rebalance
the microscope while it is above the eld of operation.
X After re-equipping, always rebalance the microscope on
the swing arm.
WARNING
Risk of injury due to downward movement of the surgical
microscope.
X Complete all preparations and adjustments to the stand
before the operation.
X Never change the accessories or attempt to rebalance
the microscope while it is above the eld of operation.
X Before changing accessories, always lock the M844.
X Balance the M844 after re-equipping it.
X Do not release the brakes when the instrument is in an
unbalanced state.
X Before re-equipping during the operation, rst swing
the microscope away from the operating eld.
X Never carry out the balancing above the patient.
X See safety notes in user manual.
X Don't use the down / up movement of ceiling mount
when the microscope is over the patient.
WARNING
Risk of injury to the patient.
X Don't switch on/o during surgery.
X Don't unplug systm during surgery.
WARNING
Danger of eye injuries!
There is a danger of injury to the patient as a result of
changing the working distance using the motorized
adjustment of the ceiling mount if the working distance falls
below the minimum of 140 mm due to the use of accessories
(such as wide-angle observation systems).
X The footswitch function for moving the ceiling mount
up and down may not be used in combination with
accessories that cause the working distance to fall below
the minimum of 140 mm.
X Before up/down movements, always check rst to
ensure that the range of movement is free of
obstructions.

Safety notes
8 M844 / Ref. 10 713 294 / Version 01
WARNING
Risk of injury due to downward movement of the surgical
microscope!
X Always lock the swing arm:
• when transporting the microscope
• when re-equipping.
WARNING
Risk of injury due to downward movement of the surgical
microscope!
X Complete all preparations and adjustments to the stand
before the operation.
X If settings need to be altered during the operation, rst
swing the microscope away from the operating eld.
X If the microscope needs to be re-equipped, do this
before the operation.
X Before re-equipping, always lock the swing arm.
X Do not use the handles or remote brake release when
the instrument is in an unbalanced state.
WARNING
Risk of infection.
X Always use the M844 surgical with sterile controls and a
sterile drape.
WARNING
Danger of fatal electrical shock.
X The M844 surgical microscope may be connected to a
grounded socket only.
X Operate the system only with all equipment in its proper
position (all covers tted, doors closed).
WARNING
Beware of:
• Uncontrolled lateral movement of the swing arm!
• Tilting of the stand!
• Feet in lightweight shoes could become trapped
beneath the casing of the base.
• Collision between user and microscope system. E.g.
between head and camera control unit holder
(CT40)
• Abrupt braking of the surgical microscope at a
threshold that cannot be crossed.
X Before transport, always move the Leica M844 F20
surgical microscopes into the transport position.
X Never move the stand in the extended condition.
X Always push the surgical microscope; never pull it.
X Never roll over cables lying on the oor.
WARNING
Motors return to their home positions
X Before switching on your Leica M844, ensure that the
travel paths of the XY, zoom and focus motors are free of
obstructions. The tilt motor is not moved.
WARNING
Danger of fatal electric shock!
X Disconnect the power cable from the power socket
before changing fuses.
WARNING
Halogen lamps become very hot!
X Always switch the main switch o before changing a
bulb.
X Allow bulbs to cool for 20 minutes before changing
them (burn hazard!).
WARNING
Risk of injury from downward movement of surgical
microscope!
X Do not exceed the max. load when equipping
components and accessories.
X Check the total weight using the "List of weights of
balanceable congurations".

Safety notes
M844 / Ref. 10 713 294 / Version 01 9
WARNING
Light that is too intense can damage the retina.
X Observe the warning messages in the "Safety Notes"
chapter.
WARNING
Risk of injury!
X Pay special attention to the required safety distances if
you use the StepCycle™ function together with
accessories from other manufacturers that can reduce
the working distance to less than 140 mm (non-contact
wide-angle observation systems), since focus together
with StepCycle is a semi-automated function.
WARNING
Danger of injury to the eyes.
X Minimize speed of focus motor during retina surgery.
CAUTION
Connecting unauthorized secondary devices to the auxiliary
power socket can lead to damage to the surgical microscope
and to the secondary device!
X Never connect secondary devices to the auxiliary power
socket unless they conform to the specications.
Requirements of use, see chapter14.5.
CAUTION
Surgical microscope can move without warning.
X Always lock the footbrake when you are not moving the
system.
CAUTION
Danger of crushing due to moving parts!
The parts of the slit illuminator that are moved by motors
may crush fingers or the hand when used improperly.
X When handling the slit illuminator, take care not to
crush any ngers.
CAUTION
There is a risk of damage to the surgical microscope from
uncontrolled tilting!
X Firmly hold the handles before triggering the "All
Brakes" function.
CAUTION
Risk of infection.
X Leave sucient space around the stand to ensure
that the sterile drape does not come into contact with
non-sterile components.
CAUTION
Damage to the M844 surgical microscope due to
uncontrolled tilting.
X Hold the handle when releasing the brake.
CAUTION
Destruction of the zoom motor!
X Only adjust the zoom manually if the zoom motor is
defective.
CAUTION
Danger of injury from uncontrolled lateral movement of the
system and arm systems.
X When transporting or moving the microscope (F20, F40)
on an inclined plane, always lock the swing arm, monitor
arm and control unit (see 14.12)
X When storing the microscope (F20 only) on an inclined
plane use the provided wedge from the transport box
(see 14.12).

Safety notes
10 M844 / Ref. 10 713 294 / Version 01
3.7 Signs and labels
Floor stand, horizontal arm, and swing arm F20
1
2
45
6
9
7813
10 18
10
10,15
10
14
11
17
12
8, 16
15
15
15
3

Safety notes
M844 / Ref. 10 713 294 / Version 01 11
1
Danger sign for hot
surface
2Leica M844
3
Mandatory label - read
the user manual
carefully before
operating the product.
Web address for
electronic version of the
user manual.
Medical Device
4
CH-9435 Heerbrugg
MODEL LEICA M844 / M822 F20
100 V - 240 V 50-60 Hz
400 VA
2x T6.3 AH/250V
Leica Microsystems (Schweiz) AG
Max Schmidheiny-Strasse 201
Type label
5
Max. power output
6
Equipotential bonding
7
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


Grounding label (only
USA and Canada)






8REF
SN
a
b
Fabrication label
a Reference number
b Serial number
9
Transport position (F20
floor stand)
10
Danger sign for squeezing
hazard
11
OCP 0004
INMETRO label (only
brazil)
12
System weight label
(F20)
13
MET label
14
ANVISA Registration
number (only brazil)
15
Tilting danger
16 UDI Label








17
Max. 10.5kg (23.15lb)
Max. load for
monitor arm
18
Max. 11.5kg (25.35lb)
Max. load for
optics carrier

Safety notes
12 M844 / Ref. 10 713 294 / Version 01
F40 floor stand
1
11
12
19
2

Horizontal arm and swing arm F40 / CT40
3
4567
8
9
13
10
14
15
18
17
16
Grounding reliability can
only be achieved when
EQUIPMENT is connected to
equivalent receptacle marked
"Hospital only" or "Hospital
Grade".
max. power output
100 VA T1 AH/250 V
La fiabilité de la mise à la
terre n'est assurée que si
l'équipement est connecté à
une prise équivalente, mar -
quée "Hôpital seulement" ou
"Qualité hôpital".
19
21 21

Safety notes
M844 / Ref. 10 713 294 / Version 01 13
1
Transport position
(F40 floor stand)
2
System weight label
(F40)
3
Danger sign for
squeezing hazard
4
Fix points for video
cable
5
Open
6
Closed
7Max. 12.2kg (26.90lb)
Max. load for optics
carrier
8Leica M844
9
Danger sign for hot
surface
10
CAUTION HIGH PRESSURE
DO NOT OPEN
Danger sign for high
pressure in the gas
spring
11
ANVISA Registration
number (only brazil)
12
OCP 0004
INMETRO label (only
brazil)
13 REF
SN
a
b
Fabrication label
a Reference number
b Serial number
14
MET label
15
CH-9435 Heerbrugg
MODEL LEICA M844 / M822 F40
100 V - 240 V 50-60 Hz
550 VA
2x T6.3 AH/250V
Leica Microsystems (Schweiz) AG
Max Schmidheiny-Strasse 201
Type labels
CH-9435 Heerbrugg
MODEL LEICA M844 / M822 C40
100 V - 240 V 50-60 Hz
100 VA
2x T6.3 AH/250V
Leica Microsystems (Schweiz) AG
Max Schmidheiny-Strasse 201
16
Mandatory label - read
the user manual
carefully before
operating the product.
Web address for
electronic version of
the user manual.
Medical Device
17 max. power output
100 VA T1 AH/250 V
Max. power output
18






Grounding label (only
USA and Canada)






19
UDI Label








20
Max. 8.5kg (18.74lb)
Max. load monitor arm
21
Tilting danger

Safety notes
14 M844 / Ref. 10 713 294 / Version 01
Leica Telescope Mount
1
1
Type labels
CH-9435 Heerbrugg
MODEL LEICA M844 / M822 C40
100 V - 240 V 50-60 Hz
100 VA
2x T6.3 AH/250V
Leica Microsystems (Schweiz) AG
Max Schmidheiny-Strasse 201

Design
M844 / Ref. 10 713 294 / Version 01 15
4 Design
4.1 Leica M844 F40
1
2
3
4
5
6
7
8
9
10
11
12
14
13
15
1 Control unit
2 Horizontal arm
3 Swing arm
4 XY-unit
5 Binocular tube
6 0° assistant’s attachment (Leica M844 only)
7 Handles
8 Optics carrier
9 Tilt head
10 Column
11 Cable support
12 Base
13 Holding fixture for video control unit
14 Hand rail
15 Suspension device for footswitch

Design
16 M844 / Ref. 10 713 294 / Version 01
F40 floor stand
20
16
21
17
18
7
19 
22
28
27
23 24 25 26
T1AH/250V
7 Handles
16 Power switch
17 Balancing knob
18 Swing arm stop lever
19 Footbrake release lever
20 Footbrake
21 Touch panel
22 Power supply
23 Fuse holder (2× 6.3 AH, time-lag)
24 Running-time meter for the surgical microscope
25 Socket for potential equalization
For connecting the Leica M844 to an equipotential bonding
device.
This is part of the customer's building installation.
Observe the requirements of EN 60601-1 (§ 8.6.7).
26 Socket for remote brake release
27 Auxiliary power outlet (max. output power 100VA )
Requirements of use, see chapter14.5
28 Fuse holder (1 AH, time-lag)
CAUTION
Connecting unauthorized secondary devices to the auxiliary
power socket can lead to damage to the surgical microscope
and to the secondary device!
X Never connect secondary devices to the auxiliary power
socket unless they conform to the specications.
Requirements of use, see chapter14.5

Design
M844 / Ref. 10 713 294 / Version 01 17
4.2 Leica M844 F20
11
12
13
14
1 Control unit
2 Horizontal arm
3 Swing arm
4 XY-unit
5 Binocular tube
6 0° assistant’s attachment (Leica M844 only)
7 Handles
8 Optics carrier
9 Tilt head
10 Column
11 Base
12 Holding fixture for video control unit
13 Hand rail
14 Suspension device for footswitch
15 Optional monitor arm

Design
18 M844 / Ref. 10 713 294 / Version 01
F20 floor stand
1
2
3
5
3
6
4
8
9 10 11 12 13
7
1 Touch panel
2 Retaining hook (blocks swing arm)
3 Articulation brakes (regulate ease of movement)
4 Handles
5 Balancing knob
6 Power switch
7 Footbrake release lever
8 Footbrake
9 Power supply
10 Fuse holder (2× 6.3 AH, time-lag)
11 Socket for potential equalization
For connecting the Leica M844 to an equipotential bonding
device.
This is part of the customer's building installation.
Observe the requirements of EN 60601-1 (§ 8.6.7).
12 Auxiliary power outlet (max. output power 100 VA)
For requirements of use, see chapter14.5.
13 Fuse holder (1 AH, time-lag)
CAUTION
Connecting unauthorized secondary devices to the auxiliary
power socket can lead to damage to the surgical microscope
and to the secondary device!
X Never connect secondary devices to the auxiliary power
socket unless they conform to the specications.
Requirements of use, see chapter14.5