Overview; Fragmentation; Tip Motion; Cooling - Valleylab CUSA EXcel-8 Service Manual

Overview
Overview
Fragmentation
The CUSA EXcel system is an ultrasonic surgical aspirator that allows a
surgeon to remove tissue—selectively and with precise control—from the
body. It performs three functions:
* Fragmentation
+ Irrigation
* Aspiration (suction).
All three functions may occur at the same time.
The CUSA Excel system includes the following components:
+ The console:
4 The console body houses electronics, pumps, and other parts that
make the system work.
4 The control panel allows the user to control the system.
e The handpiece is the handheld surgical device that actually touches
the patient.
e Accessories include a variety of items; for example, manifold tubing, a
large selection of tips, a tip torquing base and torque wrench, and a
sterilizer case.
Tip Motion
Fragmentation occurs when the vibrating tip interacts with tissue. As the
tip begins to move toward tissue, it accelerates, impacts the tissue, then
penetrates the tissue. The acceleration, impact, and penetration produce a
combination of direct mechanical forces and hydrodynamic pressures that
burst cells.
For more information on how the handpiece works, refer to Section 6,
Principles of Operation, in this manual.
Cooling
The high frequency vibration generates heat. To reduce the heat, the
CUSA EXcel system includes a closed, recirculating cooling water system.
This system pulls water from a cooling water reservoir, through a tube in
the handpiece cable, through the handpiece, and through a return tube in
the handpiece cable to the cooling water reservoir. Cooling water flows at
35 to 50 cc/min.
As it passes through the handpiece, the water removes heat.Normal
handpiece temperature, in sustained heavy use, remains at about 40° C.