Intraoperative Testing - Boston Scientific Avista MRI Mode D'emploi

3. Remove the needle stylet from the insertion needle and verify entry into the epidural space using the
standard technique.
4. OPTIONAL: Under fluoroscopic guidance, insert the lead blank through the insertion needle and into
the epidural space. Advance the lead blank to verify entry into the epidural space, then withdraw the
blank.
5. While holding the lead stylet handle, place the steering cap over the proximal end of the stylet handle
with moderate force until it is held in place. Then slowly insert the lead, with stylet, through the
insertion needle. The lead stylet should extend to the tip of the lead.
6. OPTIONAL: If exchange of the lead stylet is desired, carefully pull out the existing stylet and insert the
preferred stylet. While inserting the stylet into the lead, if resistance is encountered, withdraw the stylet
approximately 3 cm, rotate the lead and/or stylet, and gently advance the stylet. If resistance is still
encountered, repeat the above procedure until the stylet can be fully inserted.
WARNING: Do not exchange the lead stylet while the electrode array of the lead is in the bevel of the insertion
needle. If the electrode array is in the bevel area, remove the lead from the insertion needle before exchanging the
stylet. Inserting the lead stylet in the lead while the electrode array is in the bevel of the insertion needle increases
the risk of lead and tissue damage.
WARNING: If the lead stylet is removed and reinserted, do not use excessive force when inserting the stylet into
the lead. The use of instruments, such as forceps, to grasp the stylet during insertion is not recommended as this
could result in applying excessive force and could increase the risk of lead and tissue damage.
7. Advance the lead to the appropriate vertebral level under fluoroscopic guidance. A sufficient length
of lead (for example, at least 10 cm, or approximately three vertebrae) should reside in the epidural
space to aid in lead stabilization.
CAUTION: If other lead electrode locations are used (e.g. retrograde, head, or peripheral), MRI scan eligibility will
be restricted. The patient will not be full-body eligible for MRI scans.
8. Proceed to the instructions for connecting to the OR Cable assembly and ETS in the Clinician Trial
Manual for your SCS System. The appropriate Clinician Trial Manual for your SCS system is listed in
the Reference Guide.

Intraoperative Testing

The following steps are for procedural reference only. For detailed stimulation testing procedures
and guidelines refer to the appropriate programming manual for your SCS system as listed in the
Reference Guide.
Figure 5: Lead placement in the Epidural Space
Instructions for Use
Avista™ MRI xxcm Contact Lead Kit
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