3.4 SYSTEM HANDPIECE
The Model 3000 features an Ultrasonic (U/S) Handpiece that receives an electrical energy
signal from the attached console and transfers it into a mechanical motion. This is
accomplished through the use of piezoelectric crystals, which are located inside an
environmentally isolated chamber at the interior of the handpiece. The mechanical motion, with
a frequency around 40 kHz and amplitude of a few thousandths of an inch, is then transferred
to an attached tip. The tip is inserted into the eye by the surgeon and placed in contact with the
intraocular lens. The vibrating motion
of the tip, enhanced by cavitational energy, emulsifies the
lens. The emulsified lens is then aspirated from the eye.
3.5 SYSTEM TUBING CASSETTE
The Tubing Cassette is a reusable component of the Model 3000 that joins the fluid tubing to the
system console without direct fluid contact. The cassette provides connections between an
irrigating fluid source, such as intravenous administration tubing set, the ultrasonic handpiece,
and a waste collection bag. The cassette tubing mates with a pump head in the system console,
which provides the driving force to aspirate the emulsified lens and fluid from the surgical site. A
valve in the system console controls the gravity flow of the irrigating f
luid to the surgical site,
maintaining intraocular pressure. The reusable tubing is dual lumen, or two tubes: one to deliver
the irrigating fluid, the other to remove the aspirated material.
3.6 SYSTEM FOOT PEDAL
The operation of the Model 3000 is mainly controlled by the Foot Pedal, which is linked to
the system by a cable connected to the back panel of the system console.
The main foot pedal has three (3) positions of operation:
Position 1: activates Irrigation
Position 2: activates Aspiration along with Irrigation
Position 3: activates the Ultrasonic Power along with Irrigation and Aspiration
NOTE: Foot pedal positions will vary depending on the Operation Mode selected.
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