PULSAR Minimal Stress
Installation and operating Manual
OPTIKON 2000
Cod. 111001EN
2012-02-16 Rev.J
7-2
negative pressure is read with a "closed system": a sterile membrane in the ACS3
cassette completely separates the negative pressure sensor from the sterile fluids.
The PULSAR unit's pump is controlled by a powerful microprocessor. The vacuum
level can be preset from the control panel or checked by the surgeon by means of
the footswitch (linear method).
VITRECTOMY (VIT)
The vitrectomy probe basically consists of two parts: the cutter tip (blade) and the
body containing the drive mechanism actuated by compressed air coming from
PULSAR console.
The probe uses the single acting actuator principle: Here air power is used to make
the unit out-stroke (extend). Once the pressure has been removed, the return (in-
stroke) is achieved by mechanical means, in this case by a built-in spring.
The tip contains the cutting element consisting of a matched outer (fixed) and
inner longitudinally reciprocating tube.
The inner tube, used for aspiration, has a front end blade with sharpened outer
edge. The front end of the outer tube has a side opening for cutting and aspiration.
The tissues are cut and simultaneously aspirated by the longitudinal reciprocating
action of the inner tube, generated by pneumatical impulses received from the
control console.
The extremely close tolerances between the inner and outer tube create a mild
constant tension to provide a self sharpening effect. It is evident that such
precision plus the guillotine design results in an ideal cutting property. The cutting
speed (from 60 to 700cuts/min) and vacuum level (from 5 to 500mmHg) are
adjustable with the mode selection and function keys on the control console.
BIPOLAR DIATHERMY
The bipolar diathermy uses Radio Frequency (RF) currents to produce heating in
body tissues, thus causing coagulation. The energy of a powerful RF oscillator
(inside the control panel) is imparted to a pair of electrodes (small pinch valves or
diathermy probes) that are applied to the biological tissues to be treated. The body
tissue becomes the dielectric of a capacitor, and dielectric losses cause coagulation
of the tissue. Dielectric loss phenomenon ensures that only the precise area of
tissue is coagulated. The application of bipolar high frequency RF output
additionally minimizes undesired neuromuscular stimulation and eliminates the
need of a plate thereby reducing patient hazard. The PULSAR unit provides
adjustable output power from 0.1 to approximately 7 watts @ 450 ohm, which is
ideal for ophthalmic procedures.
