title: [Characteristics of cerebral aneurysm clips based on measurements of the opening pressures: basic research using a high-pressure perfusion circuit and a porcine vessel].
abstract: BACKGROUND
  The closing force of cerebral aneurysm clips is measured according to International Organization for Standardization guidelines. However, it is difficult to predict the risk of a clip using only the closing force. To investigate the clips' detailed characteristics and assess their limits, we used a high-pressure perfusion circuit and measured the critical pressure to the slipping point.
  
  
  METHODS
  Opening pressures were measured for 3 types of Sugita clips using a high-pressure perfusion circuit and a porcine vessel. The opening pressures at different points on various blade lengths and shapes were also measured.
  
  
  RESULTS
  The opening pressure of a short blade clip was higher than that of a long one. In a straight blade of the same length, the opening pressure of the proximal segment of a blade was higher than that at the distal segment.
  
  
  CONCLUSIONS
  Our study showed the characteristics of various clips, such as blade length. These findings suggested that clips should be chosen on a case-by-case basis.
authors.affiliation: Department of Neurosurgery, St. Marianna University School of Medicine.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Mizuniwa
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Hidemichi
authors.initials: H
authors.lastname: Ito
authors.forename: Kotaro
authors.initials: K
authors.lastname: Oshio
mesh_terms: D000818:Animals; D004867:Equipment Design; D002532:Intracranial Aneurysm / Q000601:surgery*; D011312:Pressure; D013525:Surgical Instruments; D013552:Swine