Codman MICROSENSOR Manual página 6

4. Remove the Tuohy needle stylet and thread
the transducer from the tip of the needle until the
approximate length for desired placement exits
from the hub (see Figure 2). CAUTION: The inner
edges of the Tuohy needle are sharp; exercise
caution when threading the catheter through.
5. Gently remove the needle, and estimate the
length of the transducer catheter from the tip
to the first bend.
6. Fold back the transducer once, completely,
at the desired bend site to leave a kink in the
catheter. Verify that the kink is on the opposite
side of the catheter from the transducer sensing
element, as shown in Figure 3.
7. Place the tip of the transducer on the brain
tissue under the dura opposite the beveled burr
hole. The kink must be placed at the bottom
of the burr hole so that the transducer sensing
element faces the cortex, as shown in Figure 4.
CAUTION: To ensure accurate ICP
measurements, position the sensing element
of the transducer tip towards the cortex during
subdural pressure monitoring.
CAUTION: To minimize movement artifacts
of the bone flap, place the transducer under
the intact skull.
8. Close and suture down the dura following
standard neurosurgical procedure.
9. Replace the bone flap and close the
scalp incision.
10. Secure the catheter to the scalp. To provide
additional strain relief, make a small loop with
the catheter and tie the loop down.
11. Close and dress the incision site.
Measuring Intraparenchymal Pressure
NOTE: The CODMAN Cranial Hand Drill, catalog
number 82-6607 is recommended for this procedure.
1. Connect and zero the transducer. Refer to the
Connecting and Zeroing the Transducer section.
2. Perform craniotomy and retraction procedures
required to expose the skull. Put the 2.7 mm
drill bit into the drill chuck and make a drill hole
through the outer table.
CAUTION: Proceed gently through the inner
table with care to avoid injury to the dura
or parenchyma.
3. Carefully bevel the incision site towards the
side from which the transducer catheter will exit.
4. Use the Tuohy needle to make a cruciate
puncture in the dura.
5. Use the Tuohy needle with stylet in place to tunnel
under the scalp from the incision site to the exit site.
6. Remove the stylet and thread the transducer from
the tip of the needle until approximately twice the
placement length exits from the hub (see Figure 5).
CAUTION: The inner edges of the Tuohy needle
are sharp; exercise caution when threading the
catheter through.
7. Gently remove the needle, and estimate the
length of the transducer catheter from the tip
to where it will bend upon exiting the skull.
8. Fold the transducer once, completely, at the
desired bend site to leave a kink in the catheter.
9. Place the tip of the transducer into the
parenchyma through the puncture in the dura
until the kink is at the edge of the hole, as shown
in Figure 6.
10. Carefully pull back the excess catheter.
11. Remove the retractor, verify hemostasis in the
insertion area, and suture the incision site closed.
12. Secure the catheter to the scalp. For additional
strain relief, make a small loop with the catheter
and tie the loop down.
13. Close and dress the incision site.
Electrostatic Discharge (ESD) Information
Exposure to electrostatic discharge (ESD)
energy could damage this device. High levels of
ESD could damage the electronic components
and cause the transducer to be rendered
inaccurate or inoperable. Take all precautions
to reduce the buildup of electrostatic charge
during the use of this product.
• Provide patient grounding, e.g., grounding
straps on gurneys.
• Avoid the use of materials that could generate
ESD during patient movement and transport,
e.g., nylon transfer boards with bedding.
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