177
Participants
Start Date
August 30, 2025
Primary Completion Date
August 31, 2026
Study Completion Date
December 31, 2026
Methylene Blue (0.3%) with Ropivacaine Hydrochloride (0.75%)
Perianal subcutaneous injection of 0.3% methylene blue solution (Formulation: 1.5 mL of 1% methylene blue with 3.5 mL ropivacaine hydrochloride injection).
Methylene Blue (0.1%) with Ropivacaine Hydrochloride (0.75%)
Perianal subcutaneous injection of 0.1% methylene blue solution (Formulation: 0.5 mL of 1% methylene blue with 4.5 mL ropivacaine hydrochloride injection).
Affiliated Hospital of Putian University, Putian
The Affiliated Hospital of Putian University
OTHER