Percutaneous Endoscopic Retrieval and Replacement of a Knitted (Ultraflex) Biliary Stent

Sawada, Satoshi; Kobayashi, Masami; Tanigawa, Noboru; Okuda, Yoshikazu; Mishima, Kazuo; Ohmura, Naoto; Kobayashi, Midori

doi:10.1007/s002709900178

Cited by 3 publications

(2 citation statements)

References 6 publications

(8 reference statements)

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“…An advantage of knitting are the complex geometries that can be produced, e.g., branched prostheses used for aortic arch replacements [23]. Among the materials that have been used for knitting are Dacron, but also carbon fiber [24] and even the nickel-titanium alloy nitinol [20]. Knitting offers an open structure that is mechanically reliable [2 -4].…”

Section: Introductionmentioning

confidence: 99%

“…Knitting is a technique that is used to create scaffolds and prostheses, such as stents for the trachea [19] and bile duct [20], scaffolds for the anterior cruciate ligament [21] and the widely used Dacron cardiovascular prostheses [22]. An advantage of knitting are the complex geometries that can be produced, e.g., branched prostheses used for aortic arch replacements [23].…”

Section: Introductionmentioning

confidence: 99%

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Electrospinning versus knitting: two scaffolds for tissue engineering of the aortic valve

Lieshout¹,

Vaz²,

Rutten³

et al. 2006

Journal of Biomaterials Science, Polymer Edition

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Abstract-Two types of scaffolds were developed for tissue engineering of the aortic valve; an electrospun valvular scaffold and a knitted valvular scaffold. These scaffolds were compared in a physiologic flow system and in a tissue-engineering process. In fibrin gel enclosed human myofibroblasts were seeded onto both types of scaffolds and cultured for 23 days under continuous medium perfusion. Tissue formation was evaluated by confocal laser scanning microscopy, histology and DNA quantification. Collagen formation was quantified by a hydroxyproline assay. When subjected to physiologic flow, the spun scaffold tore within 6 h, whereas the knitted scaffold remained intact. Cells proliferated well on both types of scaffolds, although the cellular penetration into the spun scaffold was poor. Collagen production, normalized to DNA content, was not significantly different for the two types of scaffolds, but seeding efficiency was higher for the spun scaffold, because it acted as a cell impermeable filter. The knitted tissue constructs showed complete cellular in-growth into the pores. An optimal scaffold seems to be a combination of the strength of the knitted structure and the cell-filtering ability of the spun structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrospinning versus knitting: two scaffolds for tissue engineering of the aortic valve

Lieshout¹,

Vaz²,

Rutten³

et al. 2006

Journal of Biomaterials Science, Polymer Edition

View full text Add to dashboard Cite

show abstract

Polyurethane-covered wallstents to recanalize wallstents obstructed by tumor ingrowth from malignant common bile duct obstruction

Nakamura

Kitagawa

Takehira

et al. 2000

Cardiovasc Intervent Radiol

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Four patients with malignant obstruction of the common bile duct had been treated with uncovered Wallstents and suffered from a reobstruction after 2-13 months (mean 5.3 months). Repeat cholangiography revealed severe stenosis of the stent lumen caused by tumor ingrowth through the mesh. A Wallstent with a self-made polyurethane-cover was inserted through the uncovered stent in these patients. The four patients were followed for 3-13 months (mean 6.3 months) until death. There was good drainage with no evidence of recurrent obstruction in all patients. We conclude that a covered Wallstent may extend patency of stented bile ducts, preventing tumor ingrowth in patients with neoplastic obstruction. Further observations are needed.

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Tissue engineered aortic valves based on a knitted scaffold

Lieshout

2005

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Percutaneous Endoscopic Retrieval and Replacement of a Knitted (Ultraflex) Biliary Stent

Cited by 3 publications

References 6 publications

Electrospinning versus knitting: two scaffolds for tissue engineering of the aortic valve

Electrospinning versus knitting: two scaffolds for tissue engineering of the aortic valve

Polyurethane-covered wallstents to recanalize wallstents obstructed by tumor ingrowth from malignant common bile duct obstruction

Tissue engineered aortic valves based on a knitted scaffold

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