ULTRASONIC
EQUIPMENT
The CUSA (Cavitron Ultrasonic Surgical
Aspirator) is used in the body to fragment and aspirate relatively soft tumor
tissue.
• Ultrasonic
techniques are well established in neurosurgery for rapid, efficient removal of
intracranial and spinal cord tumors.
• Their use is in
resection and dissection applications in:
a. Liver.
b. Kidney.
c. Spleen.
d. Pancreas and urology, the application is
gaining popularity.
• Ultrasonic surgery is
carried out with the aid of a special instrument known as the CUSAtm—(Cavitron
TM Ultrasonic Surgical Aspirator).
• This is an acoustic
vibrator which consists of three distinct components (Fig.):
a. Transducer: A magnetic device which
converts electro-magnetic energy into mechanical vibrations. The transducers is
composed of a stack of nickel alloy laminations. A magnetic field is produced
by a coil placed around the laminations and causes mechanical motion of
approximately 300 microns.
b. Connecting body: Mechanically couples
the motion of the transducer to the surgical tip; it also amplifies the
vibration motion of the transducer.
c. Surgical tip: Completes the motion
amplification and also contacts the tissue. The tip is relatively long compared
to its diameter and is constructed to provide adequate motion amplification.
• The electric coil which
is permanently fitted in the hand piece, surrounds the transducer. This coil
receives 23,000 cycles per second (hertz) alternating electric current from the
console and activates the transducer
• The hand piece is connected
to the console by a cable which includes the tubing for circulating fluid
between the cooling water canister in the console and the hand piece
• Since the electric coil
has a current flowing through it and the transducer lamination are moving back
and forth 23,000 times per second, heat is generated and absorbed by the water
circulating within the hand piece
• This keeps the hand piece
at a comfortable temperature for the surgeon.
Any questions be sent to drmmkapur@gmail.com
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