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12. OAS Directions for Use
12.1. Performing the Atherectomy Procedure
1. Ensure that the OAD guide wire brake lever is open (in the up position).
2. Lock the crown advancer knob at 1 cm from the fully proximal position.
3. While keeping guide wire placement stationary, advance the OAD drive shaft over the
guide wire and through the hemostasis valve.
4. Under direct visualization, gently advance the OAD crown over the guide wire to a
position approximately 1 cm proximal to the lesion. Verify that the OAD distal tip is
not within the lesion when the crown and drive shaft begin to spin.
(Optional) Use the GlideAssist feature to facilitate advancing the OAD crown over
the VIPERWIRE guide wire.
Warning: Spinning the crown using GlideAssist can be done with the OAD guide
wire brake lever in either the locked or unlocked position. If using GlideAssist with
the guide wire brake in the unlocked position, the guide wire must be held using
either fingers or the guide wire torquer. If using the guide wire torquer, ensure that it
is securely fastened to the guide wire before starting to spin using GlideAssist.
a. Enable GlideAssist mode by pressing and holding the low speed button. Release
the button once the low speed light begins to slowly blink. The slowly blinking
light indicates GlideAssist mode is enabled.
b. Ensure the guide wire is secure by locking the guide wire brake or by holding
the guide wire with either fingers or the guide wire torquer.
c. Press and release the On/Off button on top of the crown advancer knob to
activate crown rotation. The low speed light will rapidly blink indicating the crown
is spinning in GlideAssist mode.
d. Stop the OAD crown rotation by pressing and releasing the On/Off button on top
of the crown advancer knob. The low speed light will slowly blink indicating the
OAD is no longer spinning but continues to be in GlideAssist mode.
e. Disable GlideAssist mode by pressing and immediately releasing any speed
button while the crown is not spinning. The low speed light will stop blinking, yet
remains illuminated indicating the OAD is now in treatment mode.
Note: If the brake configuration is changed from either the locked or unlocked
position while spinning in GlideAssist mode, the crown will automatically stop
spinning yet the OAD will remain in GlideAssist mode.
5. Inject contrast medium through a port in the hemostasis valve to verify that the size of
the crown is compatible with the treatment area diameter (see Appendix C).
6. Verify that the guide wire spring tip is distal to the lesion and is not in danger of
coming in contact with the advancement of the spinning crown and drive shaft tip.
7. Push down on the guide wire brake lever to engage the guide wire brake. The crown
will not spin if the guide wire brake is not locked.