Double edge design, sharp and convenient, swan neck design to reduce the occlusion of the surgical field of vision. It has double edge design, longer edge and shorter edge for multiple use for fine cutting with longer edge down and shorter edge up. The curved blade can easily scrape the tissue. The curved small back blade improves the cutting performance. The swan neck design on the front of the handle ensures no blocking of the vision under the microlens. It is suitable for tissue parts which require fine and sharp separation, such as skin flaps, free blood vessels, etc.