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Images of ProKnife (ORISE ProKnife; Boston Scientific, Tokyo, Japan). (a) Whole image of ProKnife. Cleaning tool attached to the device (arrow a). (b) The distal tip of ProKnife. The distal tip has a 2.0 mm length (arrow a). T‐shaped tip has a 0.81 mm diameter (arrow b) and 0.15 mm thickness (arrow c). Shaft has 0.5 mm diameter (arrow d). Lumen has 0.3 mm diameter (arrow e). (c) Injection function of ProKnife. (d) ProKnife connected to the syringe containing hyaluronic acid
