The Dr. Mach MACH M3 is an OT-lamp designed for surgical and medical applications, featuring advanced optical systems to provide optimal illumination of the wound area. It is available in several versions: a standard OT-lamp (F-model) with merging light fields, a Duo-Focus OT-lamp (DF-model) with both merging light fields and focusing capabilities, and versions of both (F/H and DF/H models) that include light intensity control.

The core function of the MACH M3 is to provide high-quality, homogeneous illumination with improved contrast. The MachVISION optical system ensures that colors are reproduced naturally and in high contrast, with a general color rendition value of Ra = 96. This allows for precise recognition of details, particularly different shades of red in a wound area, which is crucial for doctors and surgeons. The R96 lighting system incorporates computer-optimized cold-light filters to minimize heat build-up in the lamp head and reduce heat radiated onto the illuminated wound area.

For the F-model and F/H-model, the illuminated area can be adjusted by merging individual light fields. This is achieved by swiveling the reflectors, causing the light fields to overlap. This feature is activated by turning the sterilisable handle (1).

The DF-model and DF/H-model offer an additional "focusing" function, known as the Duo-Focus system. This allows for further adjustment of the illuminated field to an extra small or extra large size, ranging from 8 cm to 35 cm in diameter, depending on specific requirements. Focusing is achieved by moving the bulbs inside the reflectors up or down. This feature is activated by turning the ring (2) at the top of the sterilisable handle. For DF/H-models equipped with a keypad at the cardan bow, touch buttons (5, 6) can also be used to expand or bundle the focus, with the current focused diameter displayed on an LED-display (4). It is important to first activate the merging of light fields by turning the handle (1), and then activate focusing by turning the ring (2) if necessary.

For F/H and DF/H models, light intensity control is an optional feature. The light intensity can be infinitely adjusted between 50% and 100% using a keypad located at the cardan bow. Push button (2) increases the light intensity, while push button (3) reduces it. The set light intensity is indicated by an LED-display (1). For other light models, a dimmer in the supply line is recommended.

Positioning the lamp is facilitated by a sterile handle (2) or handle rails (1). The handle rails are used for initial positioning before an operation, while the sterile handle is used for positioning during the operation and can be removed for sterilization. The working distance for F-lamps ranges from 0.7m to 1.4m, and for DF-lamps, it ranges from 0.6m to 1.5m. The handle is designed with a detectable mechanical catching mechanism, which, when engaged, optimally sets the lamp for a working distance of 1 meter. The system also supports the use of two or more lamps for intensive illumination of large operation fields or simultaneous illumination of two separate fields.

Maintenance of the MACH M3 involves several key aspects. The lamp housing, dispersing lens, and support system are designed for easy cleaning. The high-quality surface of the OT-lamp can be cleaned with conventional cleaning agents. The lens system (2), made of high-quality plastic, should always be cleaned with a wet cloth and only with disinfectants containing less than 20% alcohol. After cleaning, the lens system should be wiped with an antistatic, non-fluffy cloth.

The sterilisable handle (1) requires specific cleaning, disinfection, and sterilization procedures before first use and every subsequent use. To remove the handle, the lock (V) must be pressed while pulling off the sleeve. To attach it, the handle is pushed on and slightly twisted until the lock (V) securely engages. Efficient cleaning and disinfection are essential for effective sterilization, and a mechanised process (disinfector) is recommended. The handles should be sterilised using steam sterilisation at a maximum temperature of 134°C, validated according to DIN EN 554/ISO 11134. Other sterilisation procedures are not permissible. Handles should be inspected for damage before re-use and can be cleaned, disinfected, sterilised, and re-used for a maximum of 1000 times.

Adjustments at the lamp head for handling the lamps can be made at points (2) and (3) using a screwdriver to adjust the brakes. If the brakes can no longer be tightened sufficiently, they must be replaced. To adjust brake (2), the upper housing part must first be removed.

Removing the upper housing part involves turning the turn-lock fastener (8) to the left over marking (5) until it stops, then lifting the upper housing part at the cardanic suspension (9). Care must be taken not to damage the sealing profile (10). Re-assembly is done in reverse order, ensuring the upper housing part is flush on the bottom housing part and the turn-lock fastener (8) is turned to the right until marking (6) (Lock) is reached.

Changing halogen bulbs (22.8V/50W) requires turning off the lamp and removing the upper housing part. The red knurled screw (1) is loosened, and the lamp socket (2) is removed without disconnecting the electrical connection (3). The faulty bulb (4) is then removed. New halogen bulbs should never be touched with bare fingers; the original packaging or a clean cloth should be used. The lamp is then re-assembled in reverse order. Only original Dr. Mach replacement bulbs should be used, as others can reduce light power and increase thermal load. Halogen bulbs have a service life of approximately 1200 hours, and it is recommended to change all bulbs in a lamp simultaneously.

Changing the dispersing lens involves turning off the lamp and removing the upper housing part. The six screws (1) at the bottom housing part (2) are loosened with a cross screwdriver, while holding the dispersing lens (3) and retaining ring (4) to prevent them from falling. The old lens and ring are removed, and a new dispersing lens is inserted. The screws (1) are then secured with safety lacquer and adhesive at the screw head. The dispersing lens should always be placed on a soft, non-scratching base to preserve its surface.

The MACH M3 lamps are supplied with brakes on the suspension fixture and lamp housing, which should be adjusted after installation if the lamp is difficult to move or does not stay in position. To ensure smooth operation throughout its lifespan, hinges should be greased once a year with acid-free grease. For adjustments to brakes or hinges at the ceiling attachment, the specific mounting instructions ("Ceiling attachment with heavy central axis" or "Ceiling / wall attachment") should be consulted.

The device also includes an external transformer (300VA) for power supply, which must be tested and validated according to IEC 60601-1. The primary voltage at this transformer can be set to different values (e.g., 115V, 132V, 230V, 247V) depending on the local power supply. The transformer must be connected to earth using the provided clamps.

The MACH M3 complies with the standards 93/42/EEC for medical products and is certified according to DIN EN 46001:1996 and DIN EN ISO 9001:1994 by TÜV München. At the end of its shelf-life, the OT-lamp components should be properly disposed of, with materials carefully separated. Electrical conducting boards should be submitted for recycling, and other components disposed of according to their contained materials.

Dr. Mach M3 - Spare Parts Information

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