Functional Overview
Principles of Operation
LigaSure Vessel Sealing Generator Service Manual
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Functional Overview
The LigaSure vessel sealing system is an isolated output electrosurgical generator
that provides power for vessel sealing and bipolar surgery.
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It includes the following features:
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LigaSure vessel sealing technology
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Vessel sealing regrasp indicator alerts you if the instrument jaws have shorted
out, if the system has reached the maximum seal cycle time, or if the tissue
impedance is out of range
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Bipolar and macrobipolar modes
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Instant Response technology
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Memory button to recall the most recently used intensity and power settings
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Smart interface for connecting a Valleylab LigaSure handset or smart
connector adapter
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Adjustable volume for the activation tone
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Handswitch or footswitch activation
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RF activation port, RS-232 serial port, and expansion port
Vessel Sealing
The LigaSure vessel sealing system provides precise energy delivery and
electrode pressure to vessels for a controlled time period to achieve a complete
and permanent fusion of the vessel lumen. This system works on isolated arteries
and veins up to and including 7 mm in diameter and tissue bundles. The system
has been optimized to produce minimal sticking, charring, or thermal spread to
adjacent tissue.
Bipolar Operation
Two modes are available:
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Bipolar – for most applications. The LigaSure bipolar system provides tissue
dessication with low voltage to prevent sparking. The power remains constant
over a specific range of tissue impedance, allowing a consistent tissue effect.
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Macrobipolar – for bipolar cutting or rapid coagulation. The system provides
higher voltage and greater power than with the bipolar mode.
Instant Response Technology
The LigaSure generator automatically senses tissue impedance and adjusts the
output voltage to maintain a consistent effect across different tissue types. This
adjustment is based on the power setting and the level of tissue impedance. The
system controls maximum output voltage to reduce tissue damage and to
minimize sparking.
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