Utility of the "A-namaran", a device to fix the arterial catheter: a Prospective, Ramdomized, Controlled Clinical Trial

INTERVENTION: Fix the arterial catheter using A‐namaran. Fix the arterial catheter by conventional method. CONDITION: Patients who undergo surgery under general anesthesia at Niigata University Medical and Dental Hospital. In adition, they plan to need radial arterial catheterization and we will be able to access to the catheter insertion site during operation. PRIMARY OUTCOME: The need for an intervention to improve catheter bent. INCLUSION CRITERIA: Patients who undergo surgery under general anesthesia at Niigata University Medical and Dental Hospital. In adition, they plan to need radial arterial catheterization and we will be able to access to the catheter insertion site during operation.