Patent ID: 7648516

Claim:
A medical knife which is formed in a diamond shape in plan view having a sharp tip at the extreme end thereof and having a function of forming an incision wound having a self-closing property which permits the incision wound to close by itself, comprising: (A) a shank; and (B) a blade portion formed continuously to the shank, said blade portion comprising: (b) an upper portion having: (i) a first slanting surface, (ii) a second slanting surface formed continuously with the first slanting surface, and (iii) a non-reflective surface formed adjacent the second slanting surface, said non-reflective surface having a plurality of concavities and convexities formed therein and being formed in a whole diamond shape in plan view; and (iv) a cutting edge formed adjacent the first slanting surface of the upper portion, along an outer edge of the blade portion, said cutting edge defining a virtual surface; (c) a lower portion formed adjacent the cutting edge and under the virtual surface formed thereby, opposite the upper portion, having: (i) a reflective lower slanting surface formed adjacent the cutting edge; and (ii) a reflective lower surface formed adjacent the reflective lower slanting surface, wherein the upper portion is thicker than the lower portion.