The short cannulated drill (119546ND)
attached on the quick coupling (129710ND)
is used to prepare the location of the screw
head. The protective sleeve (119552ND) must
be used during this stage.
The short drill will be inserted in the
sleeve before drilling. This allows to limit
the depth of reaming due to marks on the
drill.
When the drill is used perpendicular to
the bone, the mark 90° must be flush
to the extremity of the sleeve
When the drill has a 45° angulation,
the mark 45° will be aligned with the
extremity of the sleeve
It is only when there is a 30° orientation
that the drill will be fully engaged in
the protection sleeve
This allows for reaming only to a depth
of 5 mm sufficient to prepare the location
of the screw head
The countersink for the outer thread is
prepared, the long drill (119571ND) is used
to prepare the distal cortex for introduction
of the screw
The use of this long drill is not recommended
unless a bi-cortical fixation is required
This long drill is introduced over the
K-wire left in place
It is graduated so that the drill depth
can be read directly
The visible number nearest to the point
of entry of the drill into the bone is the
length of the buried part of the drill
