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HFE-120RW-1.76 “Nadiya-4” High-Frequency Electrosurgical Unit
The unit is designed for cutting and coagulation of soft tissues and blood vessels using high-frequency current in an anesthetic-free environment during surgical procedures in hospitals and clinics.
The unit is intended for use in specially equipped rooms at ambient temperatures from 10°C to 35°C and relative humidity up to 80% at 25°C.
Operating Principle
This device acts as a source of high-frequency current. The HF voltage is supplied either to the active and passive (monopolar) electrodes or to the bipolar forceps (electrode), and then delivered to the patient’s tissue. The electrosurgical cutting and coagulation effects are achieved by generating sufficient heat in biological tissue through a narrow HF current stream at the contact point of the active electrode or between the ends of the bipolar forceps.
When using monopolar electrodes (CUT-1, CUT-2, COAG-M modes), the active electrode is significantly smaller than the passive one, which results in much higher current density near the active electrode and thus greater tissue heating at that point. If the generated power near the active electrode is sufficient, the tissue fluid vaporizes, causing tissue rupture and cutting.
In bipolar forceps mode (COAG-B), both electrodes are active, of equal size, and positioned close to each other. HF voltage applied to these electrodes generates current that heats the tissue between them. At the required temperature, the proteins within the tissue coagulate.
Technical Specifications and Additional Features
The device supports the following operating modes: standby, cutting, and coagulation, with specific sub-modes for:
Cutting:
- CUT-1 mode – monopolar, continuous HF wave generation after generator activation;
- CUT-2 mode – monopolar, amplitude-pulse modulated HF wave generation after activation.
Coagulation:
- COAG-M mode – monopolar, continuous HF wave generation after generator activation;
- COAG-B mode – bipolar, continuous HF wave generation after generator activation.
Output power in all modes is discretely adjustable from minimum to maximum.
The device provides:
- Idle mode and short-circuit protection at any output power level;
- Visual indicators:
- Power supply ON – green indicator;
- Selected mode: CUT – yellow indicator on a yellow background; COAG – yellow indicator on a blue background;
- Output power level in relative units – red indicator on a yellow or blue background depending on mode;
- Passive electrode cable disconnection – red “Err PE” text on the power level indicators.
- Audible tone-frequency signaling:
- Output power to electrodes: CUT – continuous tone; COAG – intermittent single beep;
- Passive electrode cable disconnection – intermittent double beep.
- Operation at maximum output power for 8 hours in repeated short-term mode: HF output current ON – 10 s, pause – 30 s;
- Maximum continuous connection to power supply: no more than 8 hours.
The device is protected against defibrillator discharge effects.
Product Composition and Delivery Set
The device package contents are listed in the table below
| No. | Item | Designation | Quantity |
| 1 | Electronic unit | 1 | |
| 2 | Control pedal (dual-button) | B-001 | 1 |
| 3 | Passive (neutral) electrode | B-003 | 1 |
| 4 | Monopolar electrode holder (2.0 mm) | B-005 | 1 |
| 5 | Bipolar forceps holder | B-007 | 1 |
| 6 | Bipolar forceps, straight, 200 mm | PP-007 | 1 |
| 7 | Straight knife electrode | 04500 | 1 |
| 8 | Curved knife electrode | 04500 | 1 |
| 10 | User manual | 1 | |
| 11 | Device packaging | 1 |
Device Construction
The unit consists of two separate components – the electronic unit and the footswitch.
Front Panel of the Electronic Unit |
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1. Manufacturer’s trademark
2. Device model name
3. CUT-2 mode indicator – mixed cutting
4. CUT-1 mode indicator – standard cutting
5. Digital output power display for CUT mode
6. COAG-B mode indicator – bipolar coagulation
7. COAG-M mode indicator – monopolar coagulation
8. Digital output power display for COAG mode
9. Power increase button (COAG mode)
10. Power decrease button (COAG mode)
11. Connector for bipolar forceps cable
12. COAG mode switch button
13. Power increase button (CUT mode)
14. Connector for active electrode cable
15. Power decrease button (CUT mode)
16. Operating section identification symbol
17. Connector for passive electrode cable
18. CUT mode switch button
19. BF-type symbol with defibrillator protection marking
20. Mains power switch
Rear Panel of the Electronic Unit |
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21. Connector for footswitch
22. Class II electrical safety symbol
23. Power cable
The electronic unit is made of plastic and consists of two covers (top and bottom) and two panels (front and rear). The front panel includes the following control and display elements:
- Power toggle switch and “POWER” indicator (20) for turning the device on
- Mode selection buttons (12, 18) and corresponding indicators showing the active operation mode: CUT modes (3, 4) and COAG modes (6, 7)
- Output power control buttons (9, 10, 13, 15) and digital indicators (5, 8) for CUT and COAG modes respectively. Buttons (9, 13) increase power, (10, 15) decrease it
- Connector “PASS” (17) – for passive electrode cable
- Connector “ACT” (14) – for active electrode holder
- Connector “BIP” (11) – for bipolar forceps cable
The rear panel includes the power cable (23) for connecting to a 220 V, 50 Hz mains socket and connector “PEDAL” (21) for the footswitch.
Footswitch |
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a) Top View 1. Cable connecting the footswitch to the electronic unit 2. Pedal for CUT mode activation 3. Pedal for COAG mode activation |
b) Bottom View 4. Protection rating symbol (IPX7) |
The footswitch is a floor-based construction with two movable pedals: the left one (2) for activating CUT mode, and the right one (3) for COAG mode. The pedals are spring-loaded and move vertically – down to activate the function when pressed with a foot and up to deactivate it when released. The footswitch connects to the electronic unit via cable.