| 摘要 |
An implant having a tube for permitting fluid flow has an outer flange at th e outlet end and a retention projection near the inlet end. The retention projection acts as a hook engaging the inside surface of the tissue, causing the implant to stay implanted in the tissue. An implant may also be provided with a methanism for temporary occlusion, in whole or in part, of the flow passage. Thus, the tube passage may be filled, partially or wholly, with absorbable material and/or a plurality of withdrawable or advanceable flow controlling strands.
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