| 摘要 |
Everting filter devices and methods for using the devices, including using the devices as intra-vascular filters to filter thrombus, emboli, and plaque fragments from blood vessels. The filter devices include a filter body nominally tubular in shape and having a large proximal opening. The filter body can extend from a proximal first end region distally over the non-everted exterior surface of the filter, further extending distally to a distal-most region, then converging inwardly and extending proximally toward the filter second end region, forming a distal everted cavity. The degree of eversion of the filter can be controlled by varying the distance between the filter first end region near the proximal opening and the closed second end region. Bringing the filter first and second end regions closer together can bring filter material previously on the non-everted filter exterior to occupy the distal-most region. |
| 主权项 |
1. A device for use in a lumen of a body vessel in a patient's body, the vessel having interior walls, the device comprising:
a first shaft having a distal region; and a filter body having an open proximal end region and a closed distal end region, the filter body being coupled to the distal region of the first shaft, the filter body being configured to be expanded within the vessel from a delivery configuration to a filtering configuration in which the filter body is expanded to a vessel engaging diameter substantially equal to an interior diameter of the vessel such that the filter body engages the interior walls of the vessel, the filter body in the filtering configuration having at least first and second filtering positions, the vessel engaging diameter of the filter body being maintained in both the first and second filtering positions, and a length of the filter body in the first position being less than a length of the filter body in the second position, wherein the proximal end region of the filter body is connected to a proximal ring and the distal end region of the filter body is connected to a distal ring, wherein the distal ring is spaced from the proximal ring a first distance when the filter body is in the first position and a second distance when the filter body is in the second position. |
