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1999 Fiscal Year Final Research Report Summary

Preventive developments in thrombosis and intimal hyperplasia in metallic stent placement for peripheral vessels

Research Project

Project/Area Number 09670909
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Radiation science
Research InstitutionHIROSAKI UNIVERSITY

Principal Investigator

YODONO Hiraku  Hirosaki University, Hospital, Division of Radiology, associate professor, 医学部・付属病院, 助教授 (30113848)

Co-Investigator(Kenkyū-buntansha) ABE Yoshinao  Hirosaki University Hospital, Department of Radiology, professor, 医学部, 教授 (10167950)
NODA Hiroshi  Hirosaki University Hospital, Department of Radiology, Instructor, 医学部・付属病院, 助手 (00292152)
Project Period (FY) 1997 – 1999
Keywordsmetallic stent / thrombosis / intimal hyperplasia / prevention / coating / annimal experiments
Research Abstract

(Purpose) Thrombosis and over intimal hyperplasia as secondary effects of metallic stent placement for peripheral arteries might influence long term patency after angioplasty because they might cause stenosis or occlusion of vessels. We herein report that we have depeloped the method of thrombosis and over intimal hyperplasia prevention by making coated stents.
(Materials and Methods) Modified Z stents(GZS- 10-1.5-CF) were used in this investigation, and they were coated with teflon, silicon and hydro-polymer . To evaluate their anti-coagulant effects, we estimate coagulation volume on the surface of non-coated stent and the coated stents after soaking in human blood. To evaluate the degree of intimal hyperplasia after stent implantation, we performed the experiments with 12 dogs. We placed the four kind of stens(non-coated, and three different coated stents) into the iliac arteries of each dog under venous anesthesia. After keeping for 6 months, we sacrified them, removed the iliac arteries with stents and evaluated the degree of intimal hyperplasia by inspective and microscopic examination.
(Results) In test of anti-coagulant effect, we recognized much more clot formation on the hydro-polymer coated stent than the other stents. In evaluation of intimal hyperplasia, very thin menbranes were noted on the stents placed into the arteries of every dogs. The depths of the membranes were from 200 to 300um, and consisted of deep collagen fibers. Macrophage, neutrocyte, lymphocyte, smooth muscle cell, myofibroblast and other giant cells were not found. These were recognized as pseudcendotherization. There was no difference between these menbranes.
(Conclusions) Coated stents could not prevent over intimal hyperplasia of stented arteries, but there was a value in this experiments that vessel reaction after stenting was revealed as pseudoendothelization.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 淀野啓: "下肢閉塞性動脈疾患の高度狭窄。閉塞病変に対する血栓溶解療法とレーザー血管形成術との併用療法およびステント技術"日本血管外科学会誌. Vol14,No6. 473-478 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yodono H, Shibutani K, Noda H, Kimura T, Shinohara A, Abe S, Shimizu M, Kako N, Suzuki S: "Laser angioplasty combined thrombolysis and metallic stent placement for occlusive disease of the pelvic and lower limb arteries."Jpn. J. Vasc. Surg.. 6. 473-478 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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