Modern surgery has entered the era of minimally invasive procedures. And for almost all laparoscopic surgeries, the first step is to establish a passage to the target area. The Trocar (puncture device) is precisely this "key" that opens up the world of minimally invasive surgery. It has evolved from a simple puncture tool into a multi-functional, standardized, and scalable entry point for surgical operations. Its applications span multiple disciplines such as general surgery, obstetrics and gynecology, urology, thoracic surgery, and orthopedics, forming the cornerstone of the minimally invasive surgery system.

I. Laparoscopic Surgery: The Foundation of Minimally Invasive Abdominal Procedures

This is the most classic and significant application area of Trocar. In surgeries such as laparoscopic cholecystectomy, radical treatment of gastrointestinal tumors, and hernia repair, the role of Trocar is of vital importance:

Establishing observation and operation ports: The first Trocar (usually with a diameter of 10-12mm) is inserted into the umbilicus to create an observation port, providing a passage for the laparoscope to enter the abdominal cavity. Subsequently, multiple (usually 2-4) Trocars are inserted as operation ports to allow instruments such as forceps, grasping forceps, and ultrasonic scalpels to enter. The specifications (diameter of 5mm, 10mm, 12mm) must be precisely selected according to the requirements of the instruments.

Maintaining the surgical space: The cannula is connected to the pneumoperitoneum machine, which is a key interface for maintaining a stable intra-abdominal pressure (usually 12-15mmHg). The sealing performance of this interface directly determines the clarity and stability of the surgical field.

Safety management of the channels: The fixed wings or threaded design of the Trocar can prevent it from slipping during the operation; the valve system at the tail end can quickly seal when changing instruments, maintaining the pneumoperitoneum and ensuring the smooth progress of the surgery.

II. Expansion of Applications in Other Endoscopic Fields

1. Thoracoscopic surgery: Used for lung lobe resection, mediastinal tumor resection, etc. The thoracoscopic Trocar needs to adapt to the anatomical characteristics of the thoracic cavity. Its cannula design may place more emphasis on preventing compression of the intercostal nerves and blood vessels.
2. Arthroscopic surgery: Used for diagnosis and treatment of knee joints, shoulder joints, etc. Arthroscopic Trocar is thinner (commonly 3-4mm), with a sharper puncture core, to penetrate the tough joint capsule. The cannula serves as the passage for tools such as arthroscopes and burring tools, and continuously perfuses normal saline to maintain the field of vision.
3. Gynecological laparoscopic surgery: Used for uterine fibroid removal, total hysterectomy, ovarian cyst removal, etc. Single-port laparoscopic surgery through the umbilicus or vagina has higher requirements for the integration of Trocars (multi-channel single-port Port).

III. The Key Role in Endoscopic and Puncture Treatments

1. Percutaneous Endoscopic Gastrostomy/Enterostomy: Under the guidance of gastroscopy or colonoscopy, a Trocar is used to puncture the abdominal wall and the stomach/colon wall to establish a long-term nutritional support or decompression channel.
2. Percutaneous Nephrolithotomy: Under the guidance of ultrasound or X-ray, a nephroscopy needle is used to establish a channel, and often a fascial dilator and a working sheath (a special Trocar system) are used to gradually expand and finally insert the channel sleeve of a rigid nephroscope. The strength, smoothness, and hemostatic performance of this system are of crucial importance.
3. Abscess or Effusion Drainage: For deep abscesses or encapsulated effusions, a Trocar can be used for puncture under imaging guidance and a drainage tube can be inserted.

IV. Clinical-driven Demands Raised by Manufacturers

The diverse application scenarios have imposed comprehensive and high-standard requirements on Trocar manufacturers:

• Standardization and specialization of specifications: A range of diameters from 3mm to 15mm and even wider, as well as various lengths from 5cm to over 15cm, are required to meet the diverse needs ranging from children to obese adults, and from the body surface to deep cavities. The Trocars for arthroscopy, laparoscopy, and thoracoscopy may also have specially optimized designs and materials.
• Ultimate pursuit of safety design: Vascular injuries to the abdominal wall and internal organ punctures are the main risks of puncture. This has led to continuous iterations of safety technologies such as safety shielding needle cores (with retractable tips), visualization punctures (transparent needle cores or optical Trocars), and blunt separation. Manufacturers must closely collaborate with surgical experts to convert these safety concepts into reliable product features.
• Humanization and efficiency design: The widespread use of disposable Trocars poses challenges to manufacturers' cost control and large-scale production capacity. At the same time, the product needs to be easy to hold, require less effort for puncturing, have a smooth opening of the sealing valve, and have low resistance for the instruments to pass through. These details together constitute an excellent "operator experience".

Conclusion

The trocar has evolved from a single instrument into a standardized and modular interface system that connects the surgical area within the patient's body with the medical team outside the body. It defines the starting point of minimally invasive surgery and supports the smooth progress of the entire surgical process. The manufacturer's task is to deeply understand the unique anatomical environments and operational habits of different disciplines such as abdominal surgery and joint arthroscopy, and transform the universal requirement of "establishing a safe, stable, and minimally invasive working channel" into a series of highly specialized and scenario-based product solutions. The quality of this "needle" and this "sheath" directly affects whether minimally invasive surgery can safely and smoothly take the first step and provide an impeccable operating platform in subsequent steps, and is an indispensable physical foundation of the modern minimally invasive surgical system.