| 摘要 |
A one-way valve suitable for implant in the human vascular system is disclosed. The valve is formed by a tube of braided filaments and has an upstream end supported in an open configuration by a radial support. The valve has a downstream portion formed by a plurality of flexible leaflets resiliently biased into a closed configuration sealing the valve. The leaflets separate under pressure to allow fluid flow downstream but close in response to back pressure to prevent retrograde flow. The leaflets are biased by internal elastic forces within the filaments or by means of a resilient flexible membrane. To prevent collapse of leaflets under relatively high back pressure, elongated support columns are arranged lengthwise along the tube. A second radial support is provided downstream to support the columns. Fasteners are positioned circumferentially around the tube to anchor the valve within the lumen of the vascular vessel.
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