5
en
DANGER
Risk of damage to the spinal cord, nerve roots, adjacent intervertebral
space or soft tissue when drilling the holes!
►
Always use the correct S
4
Cervical drilling guides when drilling the
holes. Do not combine drills and guides incorrectly.
►
Always check the drill lengths with the guide sleeve being used
using a caliper (e.g., AA845R, Caspar instrument for anterior cer-
vical fusion) before starting to drill.
DANGER
Injury to spinal cord and nerve roots caused by application of a drill
that is too long!
►
Use x-ray image to select an appropriate drill length prior to the
operation.
►
Alignment and insertion of the drills may only be executed under
radiographic monitoring and/or aided by a navigation system.
►
Select a drill of a length equivalent to the intended drill hole depth.
►
To insert drill in twist drill handle
1
:
– Pull back locking sleeve against the spring pressure, in the direction
indicated by the arrow and hold it there.
– Push drill into the adapter of twist drill handle as far as it will go.
– Slightly twist drill while releasing locking sleeve.
Fig. 3
Drill engages audibly
DANGER
Risk of injury and damage to the drill if the rotational speed is too
high!
►
Be sure to set a rotational speed appropriate for the intended
application.
Fig. 4
Drilling with the drill guide (FW053R, FW049R or FW669R)
►
For the variable drill guide
7
, set the depth to be drilled on the depth
stop by rotating the plastic collar on the guide sleeve. The fixed drill
guide (14 mm)
8
has a green handle. The fixed drill guide (12 mm)
8
has a red handle.
►
Check the length to be drilled prior to drilling by inserting the drill in
the guide and measuring the cutting depth with a caliper (e.g.,
AA845R).
►
Drill to the preset depth. The stop unit stops the drill on the guide
sleeve.
2.3.3
Tapping (optional)
S
4
Cervical screws are self-tapping screws. However, if the bone quality is
found to be hard, the operating surgeon can decide to pre-tap the thread
with the S
4
Cervical tap.
DANGER
Risk of tissue injury when inserting the S
4
Cervical tap or stripping
bone threads!
►
Always check if the sleeve retracts correctly prior to applying the
S
4
Cervical tap.
►
To tap the thread:
– Slowly drive the S
4
Cervical tap
4
in steadily until the required
depth is reached.
– The depth is read from the scale as the sleeve retracts during tap-
ping.
Fig. 5
Depth is read from scale
2.3.4
Positioning and temporary fixation of an S
⁴
Cervical screw
Picking up the S
⁴
Cervical screw
►
Pick up the S
4
Cervical screw with the S
4
Cervical self holding polyaxial
screwdriver
11
.
Fig. 6
Picking up the S
4
Cervical screw
►
To prevent the S
4
Cervical screw from dropping out of the S
4
Cervical
self holding polyaxial screwdriver
11
during transfer to the operating
surgeon, lock the instrument by pulling back and releasing the blue
knob.
►
Make sure that the S
4
Cervical screw is firmly seated on the S
4
Cervical
self holding polyaxial screwdriver and the polyaxiality of the screw is
blocked for insertion.
Using the S
⁴
Cervical TH threaded screwdriver 12
►
Hold the S
4
Cervical screw body in one hand.
►
Insert the S
4
Cervical TH threaded screwdriver
12
into the S
4
Cervical
screw hex.
►
To affix the S
4
Cervical TH threaded screwdriver
12
to the screw, rotate
the blue handle clockwise until the screwdriver thread engages the
screw thread.
►
Tighten until resistance is felt. Do not overtighten as this can cause dif-
ficulty disengaging the screwdriver after screw placement.
►
After insertion of the S
4
Cervical screw into the patient: Rotate the
blue handle counter-clockwise to release the S
4
Cervical TH threaded
screwdriver
12
.
Содержание Aesculap S4
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