Safety cartridge for retrievable medical filter

Abstract From the Canadian patent

The present invention relates to a safety cartridge for a medical filter which can be inserted through a percutaneous access point via a catheter or introducer, and placed in a blood vessel or other body passage. Filters may have features which are not longitudinally symmetrical such as anchors or barbs which angle toward one end or a retrieval hook at only one end. Depending on the physician's selection of the access point the filter may be introduced to a desired site for treatment from opposing directions. However it is desirable to introduce the filter with the desired alignment (inserting the desired end in first) regardless of where the selected access point is and accordingly …