title: Endovascular coiling of small intracranial aneurysms using a very soft bare platinum coil: A comparison of the packing performance of new and old HyperSoft® helical coils.
abstract: OBJECTIVE
  Soft and small coils are known to be appropriate for the treatment of small aneurysms. The purpose of this study was to determine whether the new HyperSoft® helical coil, which is softer and smaller than its predecessors, has any effect on the packing performance in a matched-pair study with an old HyperSoft® helical coil.
  
  
  METHODS
  Thirty-six consecutive patients harboring 43 cerebral aneurysms treated with new HyperSofts were included in this study. Forty-one aneurysms treated with old HyperSofts were identified from our database as matched controls based on similar volumes and locations. Packing attenuation, adverse events during the procedures, and angiographic occlusions were observed and compared between the two groups.
  
  
  RESULTS
  The mean packing density was significantly higher in the new HyperSoft® group compared to the control group (35.5% vs. 26.9%), and a larger proportion of the aneurysms embolized with the 1.5 mm size coil, which has higher packing density. There was no difference in immediate and midterm angiographic outcomes. There was no difference in the rate of intraprocedural perforation, but there was no intraprocedural rupture related to the 1.5 mm coil.
  
  
  CONCLUSIONS
  The use of new HyperSoft® helical coils allows higher packing density comparable with the old technology. New HyperSoft® coils, especially those with 1.5 mm loop diameter, can be expected to fill smaller residual spaces in small aneurysms and may be helpful in preventing recanalization.
authors.affiliation: Department of Neurosurgery, Tianjin Huanhu Hospital, PR China.
authors.forename: Hecheng
authors.initials: H
authors.lastname: Ren
authors.affiliation: Department of Neurosurgery, Second Hospital of Tianjin Medical University, PR China doctoryinlong@126.com.
authors.forename: Ming
authors.initials: M
authors.lastname: Wei
authors.affiliation: Department of Neurosurgery, Tianjin Huanhu Hospital, PR China.
authors.forename: Long
authors.initials: L
authors.lastname: Yin
authors.affiliation: Department of Neurosurgery, Tianjin Huanhu Hospital, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Ma
authors.affiliation: Department of Neurosurgery, Laiyang Central Hospital of Yantai, PR China.
authors.forename: Longfeng
authors.initials: L
authors.lastname: Peng
mesh_terms: D055119:Elastic Modulus; D004621:Embolization, Therapeutic / Q000379:methods*; D057510:Endovascular Procedures / Q000379:methods*; D006490:Hemostatics / Q000627:therapeutic use*; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D010984:Platinum / Q000737:chemistry / Q000627:therapeutic use*; D011859:Radiography; D016896:Treatment Outcome
chemical_list: D006490:Hemostatics; D010984:Platinum
keywords: Guglielmi detachable coil; HyperSoft® helical coil; Intracranial aneurysms; endovascular techniques