Abstract
There are many kind of surgical instruments.These surgical instruments are fractionalized by how to use it and affected part where use it. Above all, raspatories have many kind of working part. These working part adapt to affected part where use it, nevertheless Grips’ s shape is not improved for long time. Current raspatory’s grip design take it for granted that doctors accustomed themselves to using raspatories. raspatory’s grips isn’t conveniently designed for doctors. I consider what kind of conditions is needed for raspatories’s grips. I considered what grips’ s shape is optimum
