OPMI VISU 150 Surgical Microscope Instructions for use Issue 1.0 Feb 2001

Contents

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Functions at a glance

5

Safety

7

Description

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VISU 150 Surgical Microscope

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Preparations for use

41

Attaching the equipment

42

Connections

46

Operation

49

Preparations for use

50

Procedure

55

What to do in an emergency

57

Maintenance / Further information

59

Index

73

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Functions at a glance

Functions at a glance VISU 150 Surgical Microscope

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Functions at a glance

VISU 150 Surgical Microscope 1 Resetting the X-Y coupling, focus and zoom *) to their initial positions 2 PD adjustment 3 Adjustable eyecup 4 Diopter scale 5 Display of magnification factor of zoom system 6 Adjustment knob for red reflex illumination (+ 2° and - 2°) 7 Release button for magnetic clutches of S8 Stand 8 Light stop knob 9 Lever for adjusting the 6° illumination 10 Tilt adjustment knob for surgical microscope 11 Focusing range marking 12 Manual zoom adjustment 13 Light guide socket *) only in combination with S8 Floor Stands

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Safety

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Directives and standards

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Notes on installation and use

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When using a fundus imaging system (e.g. BIOM II)

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Phototoxic retinal injury in eye surgery

12

Warning labels and notes

15

Safety

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Safety

The instrument described in this manual has been developed and tested in accordance with Carl Zeiss safety standards and with national and international regulations. A high degree of instrument safety is thus ensured. We would like to inform you on the safety aspects involved in operating the instrument. This chapter contains a summary of the most important precautions to be observed. Further safety notes are also contained in other parts of this user's manual; they are marked with a warning triangle containing an exclamation mark as shown here. Please pay special attention to these safety notes. Safety is only ensured when this instrument is operated properly. Please read through this manual carefully before turning the instrument on. Also read through the user's manuals of the other equipment used with this instrument. You may obtain further information from our service organization or authorized representatives.

Directives and standards The instrument described in this manual has been designed in compliance with the following standards: – EN – IEC – UL – CSA In accordance with Directive 93/42/EEC, Annex II, Article 3, the qualitymanagement system of Carl Zeiss has been approved by TÜV Rheinland, which is a notified body. The registration number is: 95 102 7601.

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The instrument must be connected to a special emergency backup line supply in accordance with the regulations or directives which apply in your country.

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This is a class I instrument as defined by Directive 93/42 /EEC.

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Please observe all applicable accident prevention regulations.

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Safety

Notes on installation and use Safe working order •

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Do not operate the equipment contained in the delivery package in –

explosion-risk areas,

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the presence of inflammable anesthetics or volatile solvents such as alcohol, benzine or similar chemicals.

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Do not station or use the instrument in damp rooms. Do not expose the instrument to water splashes, dripping water or sprayed water.

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Immediately unplug any equipment that gives off smoke, sparks or strange noises. Do not use the instrument until our service representative has repaired it.

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Do not place any fluid-filled containers on top of the instrument. Make sure that no fluids can seep into the instrument.

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Do not force cable connections. If the male and female parts do not readily connect, make sure that they are appropriate for one another. If any of the connectors are damaged, have our service representative repair them.

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Potential equalization: The instrument can be incorporated into potential equalization measures. For this purpose, contact our service department.

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Do not use a mobile phone in the vicinity of the equipment because the radio interference can cause the equipment to malfunction. The effects of radio interference on medical equipment depend on a number of various factors and are therefore entirely unforeseeable.

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Modifications and repairs on these instruments or instruments used with them may only be performed by our service representative or by other authorized persons.

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The manufacturer will not accept any liability for damage caused by unauthorized persons tampering with the instrument; this will also forfeit any rights to claim under warranty.

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Use this instrument only for the applications described.

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Only use the instrument with the accessories supplied. Should you wish to use other accessory equipment, make sure that Carl Zeiss or the equipment manufacturer has certified that its use will not impair the safety of instrument.

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Safety

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Only personnel who have undergone training and instruction are allowed to use this instrument. It is the responsibility of the customer or institution operating the equipment to train and instruct all staff using the equipment.

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Keep the user's manuals where they are easily accessible at all times for the persons operating the instrument.

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Never look at the sun through the binocular tube, the objective lens or an eyepiece.

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Do not pull at the light guide cable, at the power cord or at other cable connections.

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This instrument is a high-grade technological product. To ensure optimum performance and safe working order of the instrument, its safety must be checked once every 12 months. We recommend having this check performed by our service representative as part of regular maintenance work. If a failure occurs which you cannot correct using the trouble-shooting table, attach a sign to the instrument stating it is out of order and contact our service representative.

Requirements for operation Our service representative or a specialist authorized by us will install the instrument. Please make sure that the following requirements for operation remain fulfilled in the future: –

All mechanical connections (details in the user's manual) which are relevant to safety are properly connected and screw connections tightened.

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All cables and plugs are in good working condition.

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The voltage setting on the instrument conforms to the rated voltage of the line supply on site.

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The instrument is plugged into a power outlet which has a properly connected protective earth contact.

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The power cord being used is the one designed for use with this instrument.

Before every use and after re-equipping the instrument

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Make sure that all ”Requirements for operation” are fulfilled.

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Go through the checklist.

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Re-attach or close any covers, panels or caps which have been removed or opened.

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Safety

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Pay special attention to warning symbols on the instrument (triangular warning signs with exclamation marks), labels and any parts such as screws or surfaces painted red.

For every use of the instrument

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Avoid looking directly into the light source, e.g. into the microscope objective lens or a light guide.

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Any kind of radiation has a detrimental effect on biological tissue.This also applies to the light illuminating the surgical field. Please therefore reduce the brightness and duration of illumination on the surgical field to the absolute minimum required.

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When operating on the eye, always use a GG 475 protection filter to ensure that the patient's retina is not exposed to unnecessary (blue) radiation (retinal injury).

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Safety

When using a fundus imaging system (e.g. BIOM II) When using a fundus imaging system (e.g. BIOM II from the company Oculus) which is usually installed between the surgical microscope and the patient, make sure that the patient is neither put at risk nor injured by the motorized focusing system or the movement of the stand arm. Only use accessories expressly certified by the manufacturer for combination with the surgical microscope described in this manual. Caution! Risk of collision!

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With the fundus imaging system swung out of position, always position the microscope body in such a way that index dot (1) of the microscope's focus is in the middle of triangle (2) of the marking.

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Select a medium magnification (e.g. 1.0).

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Lower the surgical microscope towards the surgical field until you see the patient's cornea sharply defined.

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Turn the screw for limiting the downward movement clockwise as far as it will go.

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It is vital that you read the user’s manual on the fundus imaging system (e.g. BIOM II from the company Oculus).

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Phototoxic retinal injury in eye surgery General Several papers have been published dealing with the problems of phototoxicity during eye surgery. A comprehensive review of these publications reveals five aspects of particular concern:

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Illumination characteristics (spectral composition)

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Intensity of illumination

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Angle of illumination

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Focus of the light source

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Exposure time to light

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Safety

In the following, comments on these aspects are given and a description of how Carl Zeiss, as a manufacturer, makes allowance for them in its instruments. Illumination characteristics (spectral composition) Studies on exposure of the eye to light of varying spectral composition date back to the early 1950s. These studies suggest that the potential hazard of phototoxic injury to the patient's retina can be reduced by blocking out the blue and ultraviolet light below a wavelength of 475 nm. Carl Zeiss provides a GG 475 retina protection filter for surgical microscopes recommended for use in ophthalmic surgery. This reduces not only the light exposure of the patient's eye, but also that of the surgeon's. It should be noted in this context that the use of filters inevitably leads to a change in the color of the light. The surgeon may therefore have to get used to the changed appearance of anatomical structures. Intensity of illumination The majority of researchers suggest that the surgeon should use the lowest light intensity necessary to guarantee good viewing during surgery. Carl Zeiss has addressed this concern by providing a device for continuously varying the brightness of the light source. This permits the surgeon to optimally adapt the light intensity at the patient's eye to the conditions existing in each case. Carl Zeiss strongly discourages the use of xenon or other high-intensity light sources in ophthalmology. Angle of illumination A number of publications suggest that the microscope should be tilted to reduce the exposure of the macula to direct illumination. Carl Zeiss ophthalmic surgical microscopes are therefore equipped with the following: –

Tilting mechanism for the microscope body

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Oblique illumination with brightness control

Focus of the light source Studies show that injuries are likely to occur if the filament of the light source is imaged on the patient's retina. The peak intensity of a filament is considerably higher than the peak intensity of an even and extended light source such as a fiber guide.

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Safety

This is the reason why fiber optic illumination is used in surgical microscopes from Carl Zeiss. Exposure time to light According to some publications, the phakic or aphakic eye should not be exposed to the light source longer than a few minutes. In every operation the exposure of the retina to light is dependent on the type and duration of surgery and on any complications which occur. It is therefore recommended in ophthalmic surgery to keep the light intensity as low as possible, or to use a device which prevents the light from entering through the patient's pupil. Also, the surrounding light sources should not cause additional strain to the patient's eye. Carl Zeiss has provided an answer to this problem in the form of a swingin retinal protection device for insertion into the beam path of the surgical microscope. This device ensures total eclipsing of the pupil, preventing light from entering into the patient's eye. It can be swung out when a red reflex is required. In conclusion Carl Zeiss recommends: –

Use of the GG 475 eye protection filter.

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Reduction of the illumination of the surgical area to the extent required for the patient's safety and for microscopic visualization.

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Tilting of the microscope body as required.

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Insertion of the retinal protection device.

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Maximum reduction of the exposure of the patient's eye to light from surrounding light sources.

These measures should help the surgeon to reduce the likelihood of phototoxic retinal injury. Note: The standard equipment of the VISU 150 Surgical Microscope includes a UV-blocking filter. The integration of this filter ensures that the illumination intensity in the wavelength range from 305 nm to 400 nm lies below the value of 50 µW/cm2 required in the future ANSI standard. These measures should help the surgeon to reduce the risk of phototoxic retinal injury.

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Safety

Warning labels and notes Caution: Observe all warning labels and notes! If any label is missing on your instrument or has become illegible, please contact us or one of our authorized representatives. We will supply the missing labels.

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Safety

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Description

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VISU 150 Surgical Microscope

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Intended use

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Description of the modules

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Illumination system

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Controls, displays, connections

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Hand grips (option)

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Binocular tubes and eyepieces

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Description

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Description

VISU 150 Surgical Microscope Intended use The VISU 150 Surgical Microscope has been designed for surgical procedures in the field of ophthalmology, i.e. the microscope meets the special requirements of this discipline. The suspension system is used to power and control the motorized functions of the VISU 150 Surgical Microscope. The motorized functions can be controlled using a foot control panel, a hand control panel or an operating chair. For further information, please contact our authorized representatives.

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Description

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Description

Description of the modules The VISU 150 Surgical Microscope comprises the following modules: 1

X-Y coupling The X-Y coupling allows motorized fine positioning of the surgical microscope in the horizontal plane. The adjustment range is 40 mm x 40 mm. (With the S8 Floor Stand, the speed of travel can be set on the display field of the stand.) The X-Y coupling is provided with a recentering facility. When you press the activator button, – the X-Y coupling adopts its center position, – the focusing system of the main microscope is reset to its initial position, – the zoom system will be reset to a pre-selected magnification factor if the XYZ-RES function has been selected (only possible with S8 Floor Stand).

This function can also be triggered using a foot control panel.

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Description

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