Limited Balloon Expansion Through the Struts of the Palmaz-Schatz and NIR Stents Compared With the Multi-Link Stent

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概要

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• After placing a stent in the main vessel of a bifurcation lesion, it is sometimes necessary to perform further balloon inflation in order to treat an ostial lesion in a side branch. The stent struts may prevent full balloon expansion at the ostium of a side branch, resulting in residual ostial stenosis. The degree of completeness of balloon inflation may vary significantly depending on the stent design and structure. A model of a bifurcation lesion with an angle of 45°was created from acrylic resin. The diameters of the main vessel and the side branch were both 3.5mm. Deployment of the Palmaz-Schatz stent (n=5), NIR stent (n=5) or Multi-Link stent (n=5) was performed in the main vessel with a 3.5-mm balloon catheter inflated to 12 atm. A 3.5-mm balloon catheter was then inflated to 12 atm through the stent struts of the main vessel and into the ostium of the side branch. The degree of completeness of balloon inflation (% balloon expansion) was calculated as (smallest diameter of balloon catheter/reference diameter of balloon catheter) ×100%. The minimal lumen diameter (MLD) and cross-sectional area (CSA) at the ostium of the side branch created with the stent struts were also measured. Limited balloon expansion through the struts was observed with the Palmaz-Schatz stent and the NIR stent, but almost full balloon expansion was observed with the Multi-Link stent (% balloon expansion: Palmaz-Schatz stent 80%, NIR stent 60%, Multi-Link stent 94%, p<0.01). The MLD and CSA of the dilated struts, representing the ostium of the side branch, of the Palmaz-Schatz stent (2.2±0.1mm, 4.5±0.3mm^2) and the NIR stent (1.8±0.1mm, 3.1±0.3mm^2) were significantly smaller compared with those of the Multi-Link stent (3.0±0.2mm, 8.4±0.6mm^2) (p<0.01). The struts of the Palmaz-Schatz stent and the NIR stent deployed in the main vessel of a bifurcation prevent full expansion of a balloon catheter inflated at the side branch ostium. In contrast, almost full balloon expansion through the struts of the Multi-Link stent is achieved.

• 社団法人日本循環器学会の論文
• 2000-10-20

著者

• Masuda Yoshiaki

  Department Of Cardiology Chiba Rosai Hospital

• Komiyama Nobuyuki

  Department of Cardiology Saitama Medical School

• Komiyama Nobuyuki

  Division Of Cardiology Saitama Medical University International Medical Center

• Komiyama Nobuyuki

  Saitama International Medical Center

• Yokoyama Masaki

  Medical Mycology Research Center Chiba University

• Kobayashi Yoshio

  Department Of Cardiovascular Science And Medicine Chiba University Graduate School Of Medicine

• MASUDA Yoshiaki

  The Third Department of Internal Medicine, School of Medicine, Chiba University

• Yamamoto Yutaka

  The Third Department of Internal Medicine, Chiba University

• Komiyama Nobuyuki

  The Third Department of Internal Medicine, Chiba University

• Kuroda Nakabumi

  The Third Department of Internal Medicine, Chiba University

• Kobayashi Yoshio

  Lenox Hill Heart And Vascular Institute

• Kuroda Nakabumi

  Department Of Cardiovascular Science And Medicine Chiba University Graduate School Of Medicine

• Masuda Yoshiaki

  The Third Clinical Department Of Internal Medicine Chiba University School Of Medicine

• Komiyama Nobuyuki

  Department Of Cardiology Saitatama International Medical Center Saitama Medical Univeristy

• Komiyama Nobuyuki

  The Third Department Of Internal Medicine Chiba University

• Yamamoto Yutaka

  The Third Department Of Internal Medicine Chiba University

• Yamaguchi Masashi

  Department Of Cardiology Chiba Rosai Hospital

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