Instructions For Use – neXus Ultrasonic Surgical Aspirator
Doc #: 100-10-1000 rev A
p 35
6.8.3 System Controls; Amplitude, Irrigation & Aspiration
(e.g. BoneScalpel or SonicOne)
6.8.3.1 Amplitude Controls
For Amplitude controls see section 6.7.3.1
6.8.3.2 Irrigation Controls
For Irrigation controls see section 6.7.3.2
6.8.3.3 Aspiration Controls
The
GREEN
display indicates the aspiration or vacuum level set by the user.
The vacuum level may be adjusted by pressing the “+” or “-“ on the green
slider below the numeric indicator on the screen. At the maximum setting of
‘100’, approximately 25 inches Hg (635 mmHg) at sea level is available at the
canister. At the minimum setting ‘0’, the vacuum is less than 1.5 inch Hg (38
mm Hg) for delicate, tissue removal applications.
The aspiration function varies slightly, based upon user preferences:
▫
When the Vibration pedal is depressed, vacuum is available up to the preset level. When the foot pedal is
released, the tissue release valve is activated and the vacuum at the tip ceases for a very short time period,
allowing the safe removal of the tip from the surgical site. Subsequently, the vacuum is reactivated for
approximately 5 minutes.
▫
When the FLUSH button on the Main screen or on the footswitch is pressed, the tissue release valve is closed and
there is no vacuum present at the tip. This is to prevent the irrigation fluid from immediately being aspirated
before reaching the surgical site. When the FLUSH button is released, the valve re-opens allowing vacuum to be
present at the tip.
▫
When the LAP Mode has been chosen
, the aspiration system works as described above for each function.
When the footswitch is depressed, the tissue release valve opens to provide vacuum to the tip and allow the
ablated tissue to be aspirated into the vacuum canister. Upon release of the Vibration pedal, the pinch valve
closes quickly (for less than a second) to allow the tip to release tissue and be safely removed from the surgical
site. It then re-opens, providing vacuum at the pre-set level to the tip for approximately 15 seconds. After 15
seconds, the pinch valve closes again and vacuum is no longer available at the tip, thus preventing insufflated
gases from escaping the body. The system is now in a Standby mode and can be reactivated by pressing any
pedal/button on the footswitch.
▫
When in Standby mode (footswitch not depressed), vacuum is available up to the preset level. The bar graph
illuminates up to the preset level signifying that this level is available at the tip. After 5 minutes of footswitch
inactivity (Standby mode), the system will go into a Suspend Mode in which aspiration is not active. The
aspiration feature can be re-activated by depressing any footswitch pedal.
