Magnetic hydrogel injected into submucosa acts as an internal magnetic anchor; external magnet provides traction and directional control to improve submucosal exposure
Target Population
Patients undergoing colorectal ESD, particularly for large lesions (30–40 mm) in difficult-to-access colon regions
Care Setting
Endoscopic surgical setting with experienced endoscopists
Key Highlights
Magnetic hydrogel can be injected via conventional 25G endoscopic needle, eliminating the need for repeated endoscope withdrawal and reinsertion during anchor placement.
Magnetic hydrogel-assisted ESD (MHA-ESD) improves submucosal visual field exposure by providing controlled magnetic traction without frictional injury risks associated with traditional magnetic anchors.
In vitro porcine colon model demonstrated feasibility and advantages of MHA-ESD compared to conventional ESD, including potential improvements in dissection speed and safety.
Guideline-Based Recommendations
Diagnosis
Identify early-stage colorectal lesions suitable for ESD via gastrointestinal endoscopy.
Management
Consider magnetic hydrogel-assisted ESD for large colorectal lesions to enhance traction and visualization.
Inject 0.5% sodium alginate/nano-Fe3O4 magnetic hydrogel into submucosa using a 25G endoscopic injection needle.
Use an external neodymium-iron-boron permanent magnet to provide directional traction during ESD.
Monitoring & Follow-up
Monitor lesion resection area, submucosal dissection speed and time, en bloc resection rate, intraoperative perforation, and muscle layer damage during procedure.
Risks
Be aware of potential frictional injury to intestinal wall with traditional magnetic anchors; magnetic hydrogel aims to reduce this risk.
Ensure stability and gelation of magnetic hydrogel to prevent dispersion and particle detachment.
Patient & Prescribing Data
Patients with early-stage colorectal tumors undergoing endoscopic submucosal dissection.
Magnetic hydrogel-assisted ESD may reduce procedure time and patient discomfort by avoiding repeated endoscope manipulation and improving submucosal exposure.
Clinical Best Practices
Prepare magnetic hydrogel with 0.5% sodium alginate and nano-Fe3O4 nanoparticles optimized for injection through 25G needles.
Perform submucosal injection of saline first to separate mucosa from muscularis propria before injecting magnetic hydrogel.
Use external strong neodymium magnets fixed on mechanical arms to control traction force and direction precisely.
Conduct procedures by experienced endoscopists familiar with ESD techniques and magnetic hydrogel handling.
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