Vascular filtering device

Abstract

A vascular filtering device is formed of a flexible shaft having a passageway extending inside the shaft, an inflatable member communicating with the passageway and having a spiral form, and a filter member fixed to the distal end portion of the shaft. The inflatable member is attached at an inner side thereof to a distal end portion of the shaft. The filter member is attached to the shaft and fixed onto the outer side surface of the inflatable member along the entire length thereof. When the inflatable member is inflated, the filter member is enlarged to allow a blood containing debris or blood clots to flow through the filter member. Thus, the debris or blood clots are captured by the filter member. When the inflatable member is deflated, the filter member is disposed close to the side surface of the shaft. Thus, the filter member with the debris or clots can be easily removed from the blood vessel.

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