ELECTRIC EQUIPMENT 12 Ultrasonic surgical systems

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.

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