Instructions For Use – neXus Ultrasonic Surgical Aspirator
Doc #: 100-10-1000 rev A
p 33
6.7.3 System Controls; Amplitude, Irrigation & Aspiration
(e.g. BoneScalpel or SonicOne)
6.7.3.1 Amplitude Controls
The
ORANGE
display controls amplitude. The ultrasonic tip engages the target area in
linear strokes at a rate of approximately 22,500 cycles per second. During each cycle the
tip elongates from resting to maximum position, contracts back over resting and to
minimum position and elongates back to its resting point. The peak-to-peak amplitude
or stroke distance can be adjusted by changing the Amplitude from setting 0-100. This is
the main parameter to control the rate of tissue removal. A high amplitude setting results
in more aggressive tissue removal, a low setting in less aggressive tissue removal.
Amplitude and thus removal rate may alter with size and geometry of the ultrasonic tip.
Amplitude can be adjusted by any of the following methods:
1.
Tapping the “+” or “-“ icons, each tap results in an incremental adjustment of 5.
2.
Touching the slider bar icon and moving right to left, while remaining contact with the screen
3.
Touching a single point along the scale bar, resulting in a direct adjustment to that position
Preset / Linear Controls:
Preset Mode – In this mode,
vibration is available immediately at its user setting when the foot pedal is
depressed.
Linear Mode -
In this mode, the vibration setting varies from 0 to the preset user setting as a linear function of
the amount of footswitch travel (i.e. gas pedal)
6.7.3.2 Irrigation Controls
The
BLUE
display controls Irrigation. Proper irrigation with sterile saline ensures:
1.
Cooling of handpiece and vibrating elements
2.
Cooling and lavage of the surgical site
3.
Lubrication of bone/tip interface for hard tissue removal
The active ultrasonic probe remains cold when not in contact with tissue. However, when a tip contacts tissue heat is
generated. The heat increases with applied tip pressure or amplitude. Irrigation needs to be applied at the tip/tissue
interface to mitigate this temperature rise.
Most ultrasonic tips feature an integrated irrigation channel. The irrigation
is expelled through a jet nozzle at the tip. Active tip surfaces are being cooled directly.
Irrigation can be adjusted by any of the following methods:
1.
Tapping the “+” or “-“ icons, each tap results in an incremental adjustment of 5.
2.
Touching the slider bar icon and moving right to left, while remaining contact with the screen
3.
Touching a single point along the scale bar, resulting in a direct adjustment to that position
Flush Control:
When the FLUSH button is pressed, irrigation pump operates at the Flush flow rate.
Pressing it again stops the flow rate.
6.7.3.3 Aspiration Controls
Pressing the
icon enables the aspiration system. For aspiration controls see section
6.5.2.3.
Aspiration can be adjusted by any of the following methods:
1.
Tapping the “+” or “-“ icons, each tap results in an incremental adjustment of 5.
2.
Touching the slider bar icon and moving right to left, while remaining contact with the screen
3.
Touching a single point along the scale bar, resulting in a direct adjustment to that position
