Prior To Distraction (Latency Phase); During Distraction (Distraction Phase) - KLS Martin group Herford Mode D'emploi

Instructions for Use
Herford Transport Distractor
WARNING
Danger of insufficient bone segment mobilization!
Insufficient mobilization will result in higher forces acting upon the distraction system, which
could lead to deformation or fracture of the distraction system.
Therefore, please note:
The bone segments to be distracted must be mobilized prior to distraction (corticotomy or
•
complete osteotomy). To verify sufficient mobilization, an activation test must be
performed intraoperatively on the implanted distraction system. The test activation must
cover at least 2 – 3 mm and a complete osteotomy gap must be produced in the process.
Deformation of the distraction system must be prevented during the distraction process.
•
14

Prior to Distraction (Latency Phase)

Once the distraction system has been implanted, a latency period must be observed before
starting the distraction process. The length of the latency period depends on the indication and
must be determined by the surgeon. It usually covers approx. 5–7 days (depending on
patient).
15

During Distraction (Distraction Phase)

The generally recommended distraction length per day is 1 mm.
The following applies to the Herford transport distraction system:
One complete turn equals 0.5 mm. We recommend one complete turn (360° = 0.5 mm) in
•
the morning and one in the evening.
On principle, the distraction must be performed by a physician, but the patient or his / her
•
relatives may perform it themselves after receiving thorough and sufficiently detailed
instruction by the physician.
When transporting bone from posterior to anterior, the patient screwdriver must be
•
activated in the direction indicated by the arrow.
When transporting bone from anterior to posterior, the patient screwdriver must be
•
activated against the direction indicated by the arrow.
The distraction progress must be monitored by continuous medical checks. For example,
•
excessive soft-tissue pull can lead to deformation of the distraction system. Such potential
deformation must be monitored by regular X-ray checks. If the distraction process is
continued in spite of deformation, this could lead to fracture due to overload or the screws
being torn out of the bone.
Revision 3 37