High‑Frequency Electrosurgical Unit HFE‑200 "Nadiya‑4"

This unit is designed for cutting and coagulating soft tissues and blood vessels using high‑frequency current without anesthesia during surgical procedures in hospitals and clinics.

The device is intended for use in specially equipped rooms at ambient temperatures between 10 °C and 35 °C and relative humidity up to 80 % at 25 °C ambient temperature.

Principle of Operation

The unit serves as a high‑frequency current source. HF voltage is applied to the active and passive (monopolar) electrodes or to a bipolar forceps (electrode), delivering current to the patient’s tissue. The electrosurgical cutting and coagulation effect is achieved by heating biological tissues with a narrow flow of HF current at the contact point of the active electrode or between the tips of the bipolar forceps. In monopolar modes (CUT‑1, CUT‑2, COAG‑M), the active electrode is much smaller than the passive one, resulting in higher current density and heating near the active electrode. If the power is sufficient, tissue fluid vaporizes and causes cutting. In bipolar mode (COAG‑B), both tips are active electrodes placed close together, producing HF current between them that heats tissue and induces coagulation through protein denaturation.

Technical Data and Additional Features

The unit supports standby, cutting, and coagulation functions, including these modes:

Cutting Modes:

• CUT‑1 – monopolar, continuous HF generation after activation;
• CUT‑2 – monopolar, amplitude‑modulated pulsed HF generation after activation.

Coagulation Modes:

• COAG‑M – monopolar, continuous HF generation;
• COAG‑B – bipolar, continuous HF generation.

Output power adjustment is discrete from minimum to maximum across all modes.

Device Capabilities:

• Idle and short‑circuit operation at any power level;
• Visual indicators:
  • Power supply active – green indicator;
  • Selected mode – yellow “CUT” or yellow-on-blue “COAG” indicator;
  • Output power level – red indicator on background color depending on mode;
  • Passive electrode cable disconnected – red “Err PE” on power indicators.
• Audible signals:
  • CUT mode – continuous tone; COAG mode – single intermittent tone;
  • Passive electrode cable disconnection – double intermittent tone.
• 8‑hour operation at maximum output with repeated short cycles (10 s ON, 30 s OFF);
• Continuous connection to mains power for no more than 8 hours.

The unit is protected against defibrillator discharges.

Product Composition and Delivery Set

The completeness of the device is presented in the table below

Unit Design

The unit consists of two separate modules: the electronic unit and the foot pedal.

Front Panel of Electronic Unit

1. Manufacturer’s logo.
2. Model name.
3. CUT‑2 (mixed) mode indicator.
4. CUT‑1 indicator.
5. Digital output power display for CUT.
6. COAG‑B indicator.
7. COAG‑M indicator.
8. Digital output power display for COAG.
9. Power‑up button for COAG.
10. Power‑down button for COAG.
11. Sockets for bipolar forceps cable.
12. COAG mode switch.
13. Power‑up button for CUT.
14. Socket for active electrode cable.
15. Power‑down button for CUT.
16. Working electrode area symbol.
17. Socket for passive electrode cable.
18. CUT mode switch.
19. BF‑type insulation and defibrillator protection symbol.
20. Mains power switch.

Rear Panel of Electronic Unit

21. Foot pedal socket.
22. Class II electrical safety symbol.
23. Power cable.

The electronic unit is housed in a plastic case with top/bottom covers and front/back panels. Its front panel includes:

• “POWER” switch and indicator;
• Mode switches (12,18) with indicators for CUT‑1, CUT‑2, COAG‑M, COAG‑B;
• Output power adjustment buttons (9,10,13,15) with corresponding displays (5,8); buttons 9/13 increase power, 10/15 decrease;
• “PAS” socket (17) for passive electrode cable;
• “ACT” socket (14) for active electrode holder cable;
• “BI” socket (11) for bipolar forceps holder cable.

The rear panel includes the power cable outlet for 220 V/50 Hz and the foot pedal socket (21).

Foot Pedal
a) Top view 1. Cable to electronic unit. 2. CUT mode pedal. 3. COAG mode pedal.	b) Bottom view 4. IPX7 protection rating mark.

The foot pedal has two spring‑loaded platforms: left for CUT (2) and right for COAG (3). Pressing down engages the mode; releasing disengages. The pedal connects to the electronic unit via cable.