Introduction to ESD Surgery

ESD (Endoscopic Submucosal Dissection) is an advanced endoscopic surgical technique mainly used to resect large and deeply infiltrated early-stage cancers or precancerous lesions in the gastrointestinal tract. Compared with conventional EMR, ESD enables en bloc resection of larger lesions, making it particularly suitable for precise treatment of gastrointestinal tumors.

Indications
ESD surgery is indicated for the following conditions:

 Large or complex early-stage cancers: early cancers of the stomach, esophagus, and colon, especially large tumors without lymph node metastasis.

 Precancerous lesions: extensive gastrointestinal adenomas or lesions with malignant potential.

Main Steps of ESD Surgery

Endoscopic examination and marking: The doctor accurately locates the lesion and evaluates its size, depth, and location via endoscopy.

Injection: An Injection Needle is used to inject saline or hyaluronic acid beneath the lesion to lift it from the underlying tissue, creating a safe working space.

Resection: A High-Frequency Electrosurgical Knife is used to make precise incisions along the lesion margin and dissect the tissue.

Tissue retrieval and hemostasis: The resected tissue is retrieved endoscopically, and bleeding is managed with hemostatic devices as needed.

Main Catheter Consumables in ESD Surgery

 Injection Needle Catheters

Function of Injection Needles: Injection needles are used to deliver fluid beneath the lesion to lift the tissue, facilitating dissection and resection. They allow accurate positioning and safe fluid injection, ensuring precision and safety during the procedure.

Design Features of Injection Needle Catheters:

High-pressure resistance: The catheter can withstand high injection pressure to ensure effective fluid delivery beneath the tissue. High-quality catheter material prevents leakage during injection and supports smooth operation.

Flexible catheter material: The catheter is soft and flexible to navigate the complex, tortuous anatomy of the gastrointestinal tract and pass smoothly through the endoscope channel.

 High-Frequency Electrosurgical Knife Catheters

Function of High-Frequency Electrosurgical Knives: As the core cutting tool in ESD, the electrosurgical knife uses high-frequency current for precise incision and tissue dissection. It not only cuts the lesion but also provides hemostasis during resection to prevent intraoperative bleeding.

Design Features of Electrosurgical Knife Catheters:

 Catheter flexibility: The catheter is soft and highly maneuverable, allowing the physician to adjust the cutting angle during surgery.

ESD is a sophisticated minimally invasive endoscopic technique especially suitable for resecting large or complex gastrointestinal lesions. Injection needle catheters and high-frequency electrosurgical knife catheters are the two most commonly used consumables, playing critical roles in tissue lifting and precise resection respectively. High-quality catheter consumables improve surgical success rates, significantly reduce intraoperative complications, and ensure safety and efficacy.