How Surgical Energy Devices Are Reshaping The Boundaries of Modern Surgery？

In the realm of modern minimally invasive surgery, energy devices have completely replaced traditional mechanical scalpels as the core tools for tissue dissection, separation, and hemostasis. Through the precise conversion of physical energies such as electrical or mechanical power, these devices have significantly reduced intraoperative bleeding and propelled the advancement of minimally invasive surgical techniques. Among them, electrosurgical generators (ESUs), ultrasonic scalpels, and intelligent vessel sealing systems (e.g., LigaSure) constitute the primary equipment in contemporary operating rooms.

As the most fundamental energy platform, the electrosurgical generator relies on the thermal effect generated when high-frequency current flows through human tissue. Monopolar electrosurgery requires a return electrode pad to form a complete circuit, generating localized high temperatures that vaporize cellular water for tissue cutting or denature proteins for coagulation and hemostasis. Bipolar coagulation, which achieves fine hemostasis through short-range current between tweezer-like electrodes, offers higher safety profiles. In contrast, the ultrasonic scalpel represents an alternative technological approach. It utilizes a transducer to convert electrical energy into 55.5 kHz high-frequency mechanical vibrations. The rapid micro-amplitude oscillation of the blade not only breaks protein hydrogen bonds under frictional heat (approximately 80–100°C) to form viscous coagulum for vessel sealing but also simultaneously achieves mechanical tissue dissection. Due to its low-temperature characteristics and the absence of current passing through the patient's body, the ultrasonic scalpel demonstrates extremely low risks of thermal injury during delicate anatomical dissection.

Intelligent vessel sealing systems, such as LigaSure, are advanced devices specifically designed for managing large vessels. Their working principle transcends the limitations of simple thermal coagulation by employing a synergistic mechanism of "mechanical pressure plus bipolar electrical energy." When the jaws clamp the target vessel, precise physical pressure is first applied to closely appose the vessel walls. Subsequently, a built-in high-frequency feedback system continuously monitors changes in tissue impedance; at the exact moment collagen and elastin undergo denaturation and fusion, the system automatically adjusts and cuts off the energy output. This intelligent temperature-controlled remodeling process effectively prevents tissue carbonization and eschar formation, enabling the safe and reliable sealing of large vascular bundles up to 7 mm in diameter.

In clinical practice, the selection of different energy devices is highly dependent on the surgical scenario and anatomical structures, a fact well-documented in various complex procedures. For instance, in comparative clinical studies of laparoscopic total hysterectomy, data indicates that patients treated with ultrasonic scalpels experienced significantly shorter bladder dissection times and reduced postoperative hospital stays, attributed to their optimal performance in opening the vesicouterine pouch and transecting the cardinal ligaments. Conversely, another study on radical abdominal hysterectomy for cervical cancer demonstrated that patients treated with the LigaSure vessel sealing system not only had significantly reduced operative times and intraoperative blood loss but also yielded a greater number of harvested pelvic lymph nodes. This highlights LigaSure's exceptional efficiency and reliability when handling highly vascularized tissues or major vessels. Furthermore, in radical thyroidectomy, where extreme protection of sensitive structures is paramount, some surgeons prefer LigaSure due to its superior external sheath temperature control compared to the limited thermal conduction resistance of ultrasonic scalpels, thereby further reducing the incidence of complications such as transient hypoparathyroidism.

For extensive operations like complex tumor resections, mature surgical strategies often involve a combined application: utilizing ultrasonic scalpels for initial precise dissection and small vessel management, followed by LigaSure for efficient occlusion of major vessels. This approach maximizes surgical efficiency while ensuring ultimate safety. Although energy devices have vastly expanded the boundaries of surgical manipulation, no device can entirely eliminate the risk of potential thermal injury. Whether it is the residual heat from an ultrasonic scalpel blade or the electrical conduction from an electrosurgical unit, surgeons are required to possess a solid understanding of device principles and maintain standardized operational habits. Looking ahead, with further advancements in integrated and intelligent technologies, energy platforms are expected to achieve seamless switching among multi-modal energies, providing even more robust technical support for precision surgery.