Implantable temporary flow restrictor device

摘要

An implantable flow restrictor device is disclosed for initially restricting, then gradually restoring blood flow through a body vessel after an interventional procedure. A self-expanding annular member having a constricted diameter gives the device a frustoconical configuration that reduces blood flow therethrough upon initial deployment at a treatment site. The annular member is constricted by a plurality of linkages that operate to allow the annular member to gradually expand, thereby transforming the flow restrictor device to a cylindrical configuration that allows unimpeded blood flow therethrough. In one embodiment, expansion of the annular member is achieved via biodegradation of the linkages. In another embodiment, expansion of the annular member is achieved via creep deformation of the linkages. The flow restrictor device may be attached to an endoluminal prosthesis, or may be a separate complementary component that is delivered during an interventional procedure.

主权项

1. A medical device for gradually restoring blood flow through a body vessel, the device comprising:
a body portion of a flexible material having an inlet and an outlet, the body portion defining a lumen that extends between the inlet and the outlet; a support structure attached to the inlet of the body portion; a self-expanding annular member attached to the outlet of the body portion; and a plurality of linkages attached to the annular member that constrict a diameter of both the annular member and the outlet of the body portion attached thereto, wherein the linkages are formed from a biostable material, wherein when a force is applied to the plurality of linkages by the self-expanding annular member in vivo, the plurality of biostable linkages are configured for elongation to allow gradual expansion of the annular member and the outlet of the body portion attached thereto such that the body portion lumen transforms from an initial frustoconical shape for reducing blood flow therethrough to a final cylindrical shape for allowing unimpeded blood flow therethrough.