Ultracision; Harmonic Scalpel
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Ultracision; Harmonic Scalpel

This Ultracision; Harmonic Scalpel course will teach you:

  • The basic principles of Ultracision and specifically how to use the Harmonic scalpel.

After studying this Ultracision; Harmonic Scalpel course you are familiar with the most common complication:

  • Heat injury to surrounding tissue

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Step by step

Introduction

Preface

General purpose

Ultracision is a technique used to simultaneously cut and coagulate tissue with the use of ultrasonic vibrations. This technique is performed with the use of an ultrasonic generator combined with an instrument. The method can be used to seal blood vessels, up to 7 mm in diameter. The technique causes minimal energy transfer to surrounding tissue, potentially limiting collateral damage. A commonly used instrument is the harmonic scalpel. Vascular structures and other soft tissue can be grasped with the jaws of the harmonic scalpel.

Working mechanism

The scalpel surface cuts through tissue by vibrating in a high frequency. Because of this high frequency vibrations, the molecules within the tissue generate stress and friction, causing the tissue to become heated, which results in protein denaturation. The ultrasonic energy is transmitted between the instrument blades. The active blade of the instrument vibrates longitudinally along the shaft, with an amplitude of 30 to 100 micrometers. The ultrasonic vibration of approximately 55,000 (55.500) Hz remains constant at all power levels, while the excursion of the blade increases. At power level 1 the blade excursion is approximately 30 micrometers and increases up to a 100 micrometers at power level 5.

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