Autodistracter

It is a four port automatic distraction device which can be fixed on ilizarov rings or any external fixator, for distraction or compression (Contraction) with an adjustable rate per day.

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Specifications:

Rate of distraction	0.5mm to 3mm/day
Single port wt	100gms
Rate of contraction	0.5mm to 3mm/day
Minimum distance between the rings	45 mm
Max distraction in one telescope setting	30mm (after 30 mm telescopes need to reset)
Optional distraction	Any rate (0 to 3 mm) can be set to any port plus any port can be kept ON or OFF during the treatment. Combination of some ports in distraction and some ports in compression mode is possible for deformity correction.

Applications and research details:

The Ilizarov Biologic Principles

Ilizarov developed the law of tension-stress, which describes the process of new bone and soft tissue regeneration under the effect of slow and gradual distraction. His biological principles can be summarized as follows:

• Minimal disturbance of bone: The new concept of corticotomy, where only the cortex of the bone is cut, preserving the periosteum and medullary cavity.
• Delay before distraction: This allows osteogenesis (or new bone formation) to begin. Duration of delay varies from 5 days in a child to about 10 days in a skeletally-mature patient.
• Rate of distraction: The optimum rate was found by Ilizarov to be 1mm/day. Elongation of more than 2mm/day may lead to slowing of osteogenesis, while elongation of 0.5mm/day or less may lead to premature consolidation.
• Rhythm or frequency of lengthening: With a distraction rate of 1mm/day, the optimum rhythm of distraction was 0.25mm every 6 hours. An autodistractor causing a continuous gradual and slow distraction of 1.0 mm/day was found to be superior to a rhythm of four times a day.

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