Using TISSUE Select
4-14 CUSA Excel Ultrasonic Surgical Aspirator System User’s Guide
Remember: The CUSA EXcel ultrasonic generator delivers electrical
power (which is directly related to the acoustic power present at the tip,
which results in fragmentation) to the handpiece. You can think of the
power delivered to the handpiece in three terms:
• Initial power – the quantity of power necessary to drive the tip
vibration in air; that is, no contact with tissue
• Reserve power – the power necessary to maintain tip vibration under
load (in contact with tissue). When the tip encounters load, a feedback
loop in the system senses the additional load and provides additional
reserve power to maintain tip vibration.
• Maximum power – the greatest power output the console can provide.
Maximum power is the sum of initial and reserve power.
TISSUE Select™ Reduces Reserve Power to the Tip
The TISSUE Select feature increases both the inherent selectivity and the
tactile feedback of the vibrating tip by reducing the reserve power the
ultrasonic generator provides to the handpiece.
How does it reduce the power? One of the variables of power
consumption is time: reduce time, reduce power consumed. To reduce
power consumption, the ultrasonic generator reduces the time that it
provides electrical power. Specifically, rather than providing power
continuously, it provides power at measured on-off intervals:
*1 ms = 1 millisecond = 1 one-thousandth of a second
TissueSelect™ Setting On-Time Off-Time
Std continuous 0 ms*
+ 40 ms 10 ms
++ 30 ms 10 ms
+++ 20 ms 10 ms
++++ 10 ms 10 ms
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