Femto Visum is an innovative femtosecond laser device for optical-reconstructive eye surgery. It can be deployed for a wide range of ophthalmic surgeries using proprietary fiber laser.
Expanded range of femtosecond ophthalmic surgeries
FemtoLASIK with controlled side-cut angle
Penetrating, front and back keratoplasty with controlled side-cut shape
Formation of corneal pockets for intrastromal lenses and rings
Formation of corneal tunnels for intrastromal corneal segments
Corneal arched laxative incisions.
Complete absence of tissue bridges in the visual zone
Proprietary technologies were used to eliminate tissue bridges.
Smooth Lines: The technology eliminates the sharp edge of neighboring scan lines. This completely eliminates laser cut non-uniformity.
Multi Overlay: This technology facilitates scan line overlay. To achieve a reliable and uniform cutting, the laser is passed multiple times in each of the treated areas. This minimizes formation of tissue bridges.
Easy Lift: This technology – used to increase radiation density at the side-cut zone during O-LASIK surgery – can obtain an easily detachable flap. In this case, the impact in the visual zone is minimized.
Proprietary femtosecond fiber laser
The all-fiber femtosecond laser provides a 200-400 fs pulse duration – the minimum value for ophthalmic femtosecond lasers in the market. Ultrashort pulse duration facilitates maximum energy density at the focus for a more effective corneal photodecomposition and minimization of corneal heating. Some of the advantages of femtosecond fiber lasers – high reliability, safety, and weak environmental influence on the laser output characteristics.
Femtosecond laser FL 300 was developed by Optosystems and optimized for use in the Femto Visum system.
Short-stay laser surgery and laser pulses with high repetition rate
In FemtoLASIK surgery, the standard valve formation time is about 15 seconds, while vacuum eye fixation takes no more than 25 seconds.
High pulse repetition frequency 1 MHz reduces surgery time while maintaining the distance between spots to only 2-3 microns. The small distance between pulses in combination with other unique laser beam scanning technologies used in the Femto Visum system ensure complete absence of tissue bridges.
Unique optical scheme with a focal point size of less than 2 microns
The patented optical scheme achieves a laser spot size of only 2 microns in focus and minimizes the laser cut thickness to about 5 microns.
Noninvasive patient interface
The optimized patient interface alters the natural eye curvature only slightly, which increases intraocular pressure by a little. At the same time, the patient’s eye is firmly fixed, thereby significantly reducing the likelihood of eye displacement during surgery.
A weak vacuum is used to fix the patient’s eye. This prevents formation of hematomas in the sclera during surgery. For added convenience, the surgeon can quickly change the vacuum value when docking the patient’s eye with Femto Visum.
The flat shape of the patient interface ensures uniform distribution of laser energy across the entire area of the processed zone. Therefore, the laser cut thickness is the same along the entire diameter of the formed flap.
The patient interface is attached to the docking cone also with the help of vacuum. The interface can be easily and efficiently fixed with just one touch.
There are several standard patient interface sizes that can achieve maximum applanation size in cases where the patient has different eye sizes, including children’s size. The use of different standard sizes provides additional comfort for patients and convenience for surgeons.
Additional benefit of two keypads
The system is controlled using two symmetrical sterilizable keypads. The two keypads are designed such that they give equal convenience to both left- and right-handers. One keypad can be used as sterilized and the other as non-sterilized.
Surgeries can be performed using only the keypad and pedals.
- The software is optimized for touch sensors – a stylus, mouse and keyboard are not needed
- The software doesn’t use small and difficult-to-read font
- In the operation window, surgery parameters can be momentarily controlled during eye docking
- When inputting parameters, the surgeon will be able to see the duration of the impending surgery
- Immediately after fixing the patient’s eye, the formed flap can be further aligned
Simple and easy to use
- A built-in laser sight for indicating the eye docking zone.
- Can be easily interfaced with any excimer laser system with the help of a rotary operating table.
- A special built-in table for keratoplasty on the donor cornea.
- Femto Visum allows for regular wet cleaning. The screen panel is IP65 protected
- Femto Visum system is small in size, mobile and can be transported over long distances without losing its performance specifications
Visum – ophthalmic complex
Femto Visum and MicroScan Visum are combined into a single set of ophthalmic complex Visum. The two systems are programmatically integrated using an in-built local server for rapid information exchange. This solution enhances the comfort of using the complex and allows for a systematic approach to taking records of performed and scheduled surgeries.
The surgeon will be able to use a single rotary operating table, thus reducing room size requirements significantly.
Laser technologies in ophthalmic surgery.
Efficiency of using FemtoLAZIK technology in Femto Visum with constant-Q-factor ablation algorithm in excimer laser MicroScan Visum.
И.А. Мушкова, Ю.И. Кишкин, Н.Х. Тахчиди (Вестник ОГУ №4(153), апрель 2013, с. 181-183)
Comparative analysis of opthalmo-ergonomics indicators after FemtoLAZIK surgery in Femto Visum and with the aid of femtosecond laser Femto LDV.