High-Frequency Electrosurgical Units and High-Frequency Surgical Systems: Differences, Efficacy, Risks, and Future Prospects

In the field of modern surgery, advanced medical devices continue to emerge, playing a crucial role in enhancing surgical efficiency and ensuring patient safety. Among these, high-frequency electrosurgical units and high-frequency surgical systems stand out as two prominent categories. By utilizing high-frequency electrical currents, they enable tissue cutting and coagulation, significantly transforming traditional surgical practices. However, many people tend to confuse the two concepts. In reality, they differ in composition, function, and other aspects, each possessing unique roles and potential risks. They also face broad yet challenging prospects in the wave of future medical technology development. A thorough understanding of these devices is crucial—both for medical practitioners to optimize surgical plans and for patients to gain clarity about the surgical process.

一.The Difference Between a High-Frequency Electrosurgical Knife and a High-Frequency Electrosurgical System

(一) Definition and Scope

The high-frequency electrosurgical unit is a medical device that utilizes high-frequency electrical currents to cut and coagulate human tissue, representing a relatively narrow and specific type of surgical instrument. It transmits high-frequency currents to tissue via electrodes, causing the water within tissue cells to vaporize instantly, thereby achieving cutting or coagulation effects. Historically, since its clinical application began in 1920, it has undergone four generations of technological evolution: spark plug discharge, high-power vacuum tubes, high-power transistors, and high-power MOSFETs. Each iteration has progressively enhanced its safety and reliability.

The scope of high-frequency surgical systems is broader, typically comprising a high-frequency generator, surgical handle, surgical electrodes (including neutral electrodes), connecting cables, and a foot switch. It can be said that the high-frequency electrosurgical knife serves as the key operational component within the high-frequency surgical system. Beyond possessing the fundamental functions similar to the electrosurgical knife—such as tissue cutting and coagulation—the high-frequency surgical system may also integrate additional advanced technologies and functional modules, forming a more comprehensive surgical equipment system.

(二) Functional Focus and Operating Methods

The primary functions of high-frequency electrosurgical units focus on tissue cutting and hemostasis. Taking the common monopolar electrosurgical unit as an example, electrical current flows from the generator through the surgical electrode to the tissue, then returns to the generator via the patient electrode, forming a complete circuit to achieve tissue cutting and coagulation. Its operation primarily relies on the surgeon manually adjusting the output power of the electrosurgical pen based on the surgical site and tissue characteristics to meet varying cutting and hemostasis requirements. For instance, during gastrointestinal surgeries in general surgery, surgeons adjust the electrosurgical unit's power output to perform cutting and hemostasis based on the distinct tissue textures of the intestinal tract, mesentery, and other structures.

High-frequency surgical systems offer more diverse and advanced functionalities. Beyond basic cutting and coagulation, some high-end systems automatically adjust output power based on tissue impedance, enabling intelligent surgical operations. For instance, certain intelligent high-frequency systems monitor tissue impedance changes in real time during surgery, automatically matching optimal current and voltage outputs to ensure surgical safety and precision. Regarding operation modes, beyond traditional manual control, some high-frequency surgical systems can integrate with advanced equipment like surgical robots. Leveraging the robot's high-precision motion control enables finer, more stable surgical procedures—a capability beyond the reach of standalone high-frequency electrosurgical units.

二. Functions of the High-Frequency Electrosurgical Unit and High-Frequency Surgical System

(一) The Function of the High-Frequency Electrosurgical Unit

1.   High-efficiency cutting and hemostasis: Demonstrates rapid tissue cutting capabilities across various surgical procedures, effectively shortening operating times. During tumor resection, it swiftly separates tumors from surrounding tissues while simultaneously achieving hemostasis through high-temperature vasoconstriction and blood coagulation. In liver surgery, where blood supply is exceptionally abundant, the hemostatic advantages of high-frequency electrosurgical units are particularly pronounced. They promptly seal bleeding points, reducing intraoperative blood loss. Statistics indicate a 30%-50% reduction in blood loss compared to traditional scalpels, maintaining a clear surgical field and creating optimal conditions for precise surgical manipulation.

2.   Broad surgical applicability: Covers nearly all surgical disciplines. In urology, it is commonly used for transurethral resection of the prostate (TURP), precisely removing enlarged prostate tissue to improve patients' urinary symptoms. In orthopedic surgery, it facilitates soft tissue cutting and hemostasis, aiding procedures around bone structures. In plastic surgery and dermatology, it is employed for scar revision and excision of skin lesions. Its precise cutting action minimizes damage to surrounding healthy tissue, promoting aesthetic outcomes and functional recovery post-surgery.

3.   Cost and Operational Advantages: Compared to other energy-based surgical methods such as laser surgery, high-frequency electrosurgical units offer lower costs and simpler operation. Laser equipment is expensive and demands stringent requirements for operating environments and maintenance, whereas high-frequency electrosurgical units feature relatively simple structures, making them more accessible for primary-level hospitals. Additionally, physicians can quickly master the operational techniques of high-frequency electrosurgical units after appropriate training, enabling flexible utilization of cutting and coagulation functions during procedures.

(二) The Role of High-Frequency Surgical Systems

1.   Enhancing Surgical Precision and Safety: Leveraging intelligent technology, high-frequency surgical systems enable more precise surgical procedures. For instance, intelligent high-frequency surgical systems automatically adjust energy output by continuously monitoring tissue impedance, preventing thermal damage to surrounding tissues from excessive energy or suboptimal cutting and coagulation results from insufficient energy. In neurosurgery—where extreme precision is paramount—the system precisely controls cutting depth and scope, minimizing accidental damage to neural tissue and significantly enhancing surgical safety and success rates.

2.   Expanding the Possibilities of Complex Surgery: When integrated with surgical robots, high-frequency surgical systems can perform intricate procedures that are difficult to execute with traditional methods. In certain coronary artery bypass grafting procedures, surgical robots working in tandem with high-frequency surgical systems enable precise cutting and vascular anastomosis within the confined, intricate cardiac vascular regions. This reduces surgical complexity and enhances outcomes. Simultaneously, the system can integrate multiple energy modalities—such as combining high-frequency electrosurgical knife and ultrasonic scalpel functions—automatically switching energy output based on tissue characteristics. This further expands surgical applicability to address more complex conditions.

3.   Optimizing Operating Room Workflows: Certain high-frequency surgical systems can integrate with hospital information systems to enable real-time recording and transmission of surgical data. During procedures, the system automatically logs data such as surgery duration, energy usage, and tissue impedance changes. Post-operatively, this data is directly transferred to electronic medical records, facilitating surgeons' review of surgical processes and assessment of outcomes. This also supports hospitals in medical quality control and research data analysis, thereby enhancing overall operating room efficiency and management standards.

三. Hazards of High-Frequency Electrosurgical Units and High-Frequency Surgical Systems

(一) Hazards of High-Frequency Electrosurgical Instruments

1.   Tissue Thermal Injury: Concentrated electrical current or prolonged electrode contact with tissue may cause thermal injury around surgical incisions, manifesting as localized tissue carbonization, eschar formation, or even deep necrosis. During surgeries on obese patients, the high electrical resistance of adipose tissue facilitates current accumulation, significantly increasing the risk of thermal injury. Statistics indicate that tissue burns resulting from improper use of high-frequency electrosurgical units occur at a rate of approximately 0.5% to 2%. Such injuries may impair wound healing and increase the likelihood of infection.

2.   Risk of Nerve Injury: During surgery in delicate anatomical regions, electrical current diffusion may affect adjacent nerves, causing temporary sensory abnormalities or motor dysfunction. In thyroid surgery, the recurrent laryngeal nerve lies immediately adjacent to thyroid tissue. Improper use of electrosurgical instruments may stimulate this nerve, leading to symptoms such as hoarseness. Studies indicate that the incidence of recurrent laryngeal nerve injury caused by high-frequency electrosurgical instruments during thyroid surgery ranges from approximately 0.3% to 1.5%.

3.   Fumes and Odor Issues: The smoke generated during procedures contains harmful substances such as cellular debris, formaldehyde, benzene compounds, and cyanides. Long-term exposure to this fume environment negatively impacts the respiratory systems of operating room personnel, causing airway irritation and potentially inducing bronchospasm, leukemia, and blood pressure disorders over extended periods. Research indicates that the toxins released from burning 1 gram of tissue are equivalent to inhaling the toxins from 3 to 6 cigarettes within 15 minutes.

4.   Interference with Implanted Devices: For patients with electronic devices such as pacemakers or implantable cardioverter-defibrillators (ICDs), electromagnetic interference generated by high-frequency electrosurgical units may cause misinterpretation by the devices, affecting their normal functioning. In orthopedic surgery, if the patient has metallic internal fixators, caution is required when using electrosurgical units near these fixators to prevent the formation of current loops, which may cause localized tissue overheating and damage.

5.   Postoperative Adhesion Risks: The thermal effects of high-frequency electrosurgical instruments may enhance tissue inflammatory responses, promote fibrin deposition, and subsequently trigger postoperative adhesions. During abdominal or pelvic surgeries, postoperative adhesions can lead to complications such as chronic pain and intestinal obstruction, thereby diminishing patients' postoperative quality of life. Studies indicate that the incidence of postoperative adhesions following the use of high-frequency electrosurgical instruments in abdominal surgeries ranges approximately between 10% and 20%.

(二) Hazards of High-Frequency Surgical Systems

1.   Technical Failure Risks: High-frequency surgical systems integrate numerous advanced technologies and complex circuits, posing risks of technical failures. For instance, a malfunction in the intelligent monitoring module may prevent the system from accurately identifying tissue impedance, leading to erroneous energy output adjustments and surgical accidents. When integrated with surgical robots, communication link interruptions could cause loss of control during procedures, resulting in severe patient injury. Equipment failures not only disrupt surgical progress but may also lead to surgical failure, increasing patient suffering and risks.

2.   The constraints imposed by high costs: The development and production of high-frequency surgical systems are prohibitively expensive, resulting in exorbitant equipment prices. A single high-end intelligent high-frequency surgical system can cost millions or even tens of millions of yuan, making it unaffordable for many grassroots medical institutions. The high equipment price also leads to substantial maintenance and servicing costs, further limiting its widespread adoption. This may contribute to uneven distribution of medical resources, preventing some patients from benefiting from advanced medical technologies.

3.   Complex Operation and Training: System operation requires multidisciplinary knowledge and intricate procedures, placing extremely high demands on medical personnel. Healthcare professionals must not only master traditional surgical techniques but also gain proficiency in electronic circuits, computer control systems, and intelligent algorithms to operate the equipment effectively. Training cycles are lengthy and challenging. If operators lack sufficient skill, surgical errors may occur during procedures—such as incorrect parameter settings or improper use of functional modules—compromising surgical outcomes and increasing operational risks.

四. Future Prospects for High-Frequency Electrosurgical Units and High-Frequency Surgical Systems

(一) Future Prospects for High-Frequency Electrosurgical Units

1.   Technological innovation drives performance enhancement: Developing novel electrode materials improves the cutting precision and hemostatic efficacy of electrosurgical instruments while reducing thermal tissue damage. For instance, employing nanomaterials in electrode construction enables more uniform current distribution due to their unique physical properties, thereby lowering local current density and minimizing thermal injury zones. Further optimization of current waveforms and control algorithms allows electrosurgical instruments to adapt more precisely to varying tissue characteristics. For example, intelligent adjustment of current waveforms according to tissue density and water content achieves optimal cutting and coagulation outcomes.

2.   Intelligent and Portable Development: Incorporating artificial intelligence technology enables electrosurgical units to automatically identify tissue types and intelligently adjust power and operating modes. During surgery, the unit analyzes tissue electrical properties to automatically determine whether it is muscle, fat, or vascular tissue, thereby matching the most suitable surgical parameters to enhance safety and efficiency. Simultaneously, miniaturized and modular designs reduce device size and weight, improving portability. Development of wearable high-frequency electrosurgical units facilitates use in scenarios such as field rescue and primary healthcare, broadening application scope.

3.   Green Environmental Protection and Sustainable Development: Develop energy recovery technologies to convert excess heat generated during electrosurgical procedures into electrical energy for storage or reuse, thereby enhancing energy efficiency. In equipment manufacturing, prioritize biodegradable and eco-friendly materials to minimize environmental pollution. Adopt a full lifecycle perspective to optimize electrosurgical device design, ensuring easier recycling, disassembly, and remanufacturing in alignment with sustainable development principles.

(二) Future Prospects for High-Frequency Surgical Systems

1.   Deep Integration of Cutting-Edge Technologies: Combined with 5G communication technology, enabling remote surgical operations. Patients in remote areas can receive surgical treatment via 5G networks, performed by specialists thousands of miles away using high-frequency surgical systems. This breaks geographical barriers and optimizes the allocation of medical resources. Integration of Virtual Reality (VR)/Augmented Reality (AR) technologies provides surgeons with more intuitive, three-dimensional surgical views. During procedures, physicians can use VR/AR devices to clearly visualize internal tissue structures, vascular distributions, and other critical information, significantly enhancing surgical precision.

2.   Personalized Surgical Customization: Leveraging big data and genetic testing technologies, the high-frequency surgical system tailors individualized surgical plans based on patient-specific variations. By analyzing patient genetic data and comprehensive physiological indicators, the system precisely maps surgical pathways, selects optimal energy parameters and surgical instruments for each patient, enabling precision medicine. This approach enhances surgical outcomes while minimizing complications.

3.   Expanding the Frontiers of Surgical Applications: In the field of minimally invasive surgery, we are continuously developing smaller, more flexible surgical instruments to complement high-frequency surgical systems, enabling procedures in increasingly complex and confined areas of the human body. For instance, developing micro-nano surgical instruments with diameters under 1mm, integrated with high-frequency surgical systems, enables procedures like intracranial microvascular lesion treatment and early tumor resection, opening new avenues for complex disease management. Concurrently, exploring applications of high-frequency surgical systems in emerging fields such as regenerative medicine and tissue engineering—for example, precisely controlling energy delivery during tissue repair surgery to stimulate cell growth and tissue regeneration.