Sugita cerebral aneurysm clips were developed in Japan by Nagoya University professor Kenichiro Sugita. Since 2007, 123 types of the Titanium Clip II have been released. It is difficult for even an experienced neurosurgeon to understand the appropriate use of all the clips. Market research indicates that the straight type and bayonet type are the most commonly used clips. Improper use is due to lack of familiarity with the various clips. Detailed knowledge is necessary to achieve optimal clipping.