1 / 15

Electro surg i cal unit

Electro surg i cal unit. PURPOSE. ESU are used for surgical cutting and for controlling bleeding by causing coagulation “ hemostasis ” at the surgical site.

moeshe
Download Presentation

Electro surg i cal unit

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Electro surgicalunit

  2. PURPOSE ESU are used for surgical cutting and for controlling bleeding by causing coagulation “hemostasis” at the surgical site. It is “high frequency diathermy” involves the transference of electrical energy into heat which ,when impact to the bodily tissues, will heat the normal cell fluid, eventually through it is boiling point. What dose “DIATHERMY” mean? DIA = through THERMO = temperature heat

  3. Principle • ESU machine is an alternating current source that operates at radio frequency “RF”. • A high frequency current flowing through active electrode “high current concentration”. • Cell ruptured-fumes or evaporates. • Return path through dispersive electrode “low current and heat dissipates”. • Patient is included in circuit. • Current concentration or density depends on the size of the area through which the current flows. • HF generation can be activated by a foot switch or finger switch on the surgical handle.

  4. System Components Electrosurgery Unit Dispersive Electrode Active Electrode

  5. RF Generator ..\ESU Principle.ppt

  6. Effect of RF on cell • When a high frequency current applied to the tissues the tissues gets turn apart and get the following effect: • Thermal effect. • Electrolytic effect. • Faradic effect.

  7. Operating frequency and typical value • Operating frequency of solid state surgical diathermy machine is 300 KHz –to-3MHz • Monopolar :CUT “0-to-350”watts for load 5 COAG”0-to-100” watts • Bipolar : CUT “0-to-50” watts COAG “0-to-10” watts

  8. Types of ESU • Spark gap generator – 1924 • Still in use today “urology , open- heart surgery”. • Spark gap / vacuum-tube device use spark –gap circuits to generate high frequency waveforms. • It is not offer the same safety feature as solid state unites.

  9. Recent technology • Argon/argon enhanced technology. • It uses a computer-controlled tissue feedback system that senses tissue impedance and automatically adjusts the current and output voltage to maintain a constant surgical effect . • It is reduces the need to adjust power setting for different types of tissue. • It is also gives improved performance at low power setting to reduce the risk of patient injury.

  10. Solid state device - 1968 • It is more recent and more prevalently used technology. • Contain oscillator circuits and transistor-based amplifier that vary the frequency and modify the shape of the line signal to create an array of different waveforms for pure CUT,COAG, BLEEND . • Highly safety.

  11. OK!, but how can I control so accurately the temperatures in the tissues ?

  12. Modes of Electro surgery Monopolar surgery Bipolar surgery

  13. Modes of electrosurgery • Electrotomy/cutting • desiccation / coagulation • Blend • fulgurations

  14. General Block Diagram Audio tone generator Power supply Logic/ Control Board Rely board Main CPU Front panel Isolation transformer LED display Power O/P or RF board Foot switch Patient return electrode

More Related