这是一种可重复使用的、与高频电刀主机配套使用的手术器械。其笔身通常由耐用的金属或医用塑料制成，通过尾部的标准3针连接器与电刀主机相连。笔尖（电极）通常为钨钢等导电材料，用于在手术中执行切割和凝血功能。

This is a reusable surgical instrument designed for use with an Electrosurgical Unit (ESU, or "Bovie") generator. The pencil body is typically constructed from durable metal or medical-grade plastic and features a standard 3-pin connector​ at its rear end to interface with the ESU generator. The tip (active electrode) is usually made of conductive material like tungsten steel, used for cutting and coagulating tissue during surgery.

1. 1.
   “可重复使用”：这是相对于一次性电刀笔而言的。产品设计坚固，可承受医院标准的清洗、消毒和灭菌流程（如高温高压蒸汽灭菌），从而降低成本并减少医疗废物。
2. 2.
   “3针连接器”：这是其电气接口的核心标识。这个连接器内部有三个独立的电接点，分别对应：
   • •
     主动电极：传递高频电流到笔尖，用于组织作用。
   • •
     回路电极：与负极板（分散电极）构成完整回路。
   • •
     识别/开关信号针：用于与主机通信，识别器械类型或控制切割/凝血功能的切换开关（如果笔身带按钮）。
3. 3.
   结构与功能：
   • •
     笔身：符合人体工学设计，便于外科医生精确握持和操作。
   • •
     笔尖：通常为细长、尖锐的电极，用于精准聚焦电流。形状多样，如针状、刀状、球形等，以适应不同手术需求。
   • •
     开关：许多型号在手柄处集成了双按钮（黄色-切割，蓝色-凝血），允许医生单手快速切换电刀模式。
4. 4.
   工作原理：连接电刀主机后，高频电流通过3针连接器传至笔尖，在笔尖与组织接触的极小面积上产生高电流密度，通过电热效应（切割）或蛋白凝固（凝血）来实现分离组织和止血的目的。
5. 5.
   临床应用：广泛应用于普外科、妇科、骨科、整形外科、胸外科等几乎所有需要电外科技术的外科手术中。
   Key Features & Description:

   1. 1.
      "Reusable": This distinguishes it from disposable pencils. It is robustly built to withstand standard hospital reprocessing cycles (e.g., cleaning, disinfection, and sterilization via autoclaving), reducing long-term costs and medical waste.
   2. 2.
      "3-Pin Connector": This is the defining feature of its electrical interface. The connector houses three distinct electrical contacts/pins, corresponding to:
      • •
        Active Electrode: Delivers the high-frequency current to the pencil tip for tissue interaction.
      • •
        Return Electrode: Completes the electrical circuit with the patient return electrode (dispersive pad).
      • •
        Signal/Switch Pin: Used for communication with the generator, such as identifying the instrument or controlling the mode switch (if the pencil has buttons for cut/coagulate).
   3. 3.
      Structure & Function:
      • •
        Pencil Body: Ergonomically designed for precise handling and control by the surgeon.
      • •
        Tip (Active Electrode): Typically a slender, pointed electrode for focused current application. Comes in various shapes (needle, blade, ball) for different surgical tasks.
      • •
        Switches: Many models integrate dual buttons on the handle (commonly yellow for Cut, blue for Coagulate), allowing the surgeon to switch modes quickly with one hand.
   4. 4.
      Working Principle:​ When connected to the ESU generator, high-frequency electrical current passes through the 3-pin connector to the pencil tip. The high current density at the small contact area between the tip and tissue generates intense heat via resistive heating, enabling vaporization of cells (cutting)​ or protein denaturation and coagulation (hemostasis).
   5. 5.
      Clinical Applications:​ Extensively used in virtually all surgical specialties requiring electrosurgery, including General Surgery, Gynecology, Orthopedics, Plastic Surgery, and Cardiothoracic Surgery.