Device for Filtering Blood
First Claim
1. Device for the filtering of blood, comprising a filter catheter with a filter at its distal end for filtering the blood branching downstream behind the heart valve into the arteries to supply the brain and the arms, wherein the filter may be pushed out of a catheter tube in the distal direction and wherein the filter is designed to expand from the proximal to the distal in the extended state, and wherein the filter has a distal filter section and a proximal section, and the distal filter section has filter openings, and the proximal section has one or more openings which are larger than the filter openings of the distal filter section wherein a lattice structure of an end section of the distal filter section has a greater stiffness in the radial direction than in the remainder of the filter section so that the end section fits tightly against the ascending aorta.
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Abstract
The device for the filtering of blood comprises a filter catheter with a filter at its distal end for filtering the blood branching downstream behind the heart valve into the arteries to supply the brain and the arms, wherein the filter may be pushed out of a catheter tube in the distal direction. The filter is tubular or designed to taper from the distal to the proximal end. The filter is designed to fit tightly, at least at its distal end section, against the ascending aorta in the area upstream of the arteries which supply the brain and the arms.
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Citations
27 Claims
- 1. Device for the filtering of blood, comprising a filter catheter with a filter at its distal end for filtering the blood branching downstream behind the heart valve into the arteries to supply the brain and the arms, wherein the filter may be pushed out of a catheter tube in the distal direction and wherein the filter is designed to expand from the proximal to the distal in the extended state, and wherein the filter has a distal filter section and a proximal section, and the distal filter section has filter openings, and the proximal section has one or more openings which are larger than the filter openings of the distal filter section wherein a lattice structure of an end section of the distal filter section has a greater stiffness in the radial direction than in the remainder of the filter section so that the end section fits tightly against the ascending aorta.
- 14. Device for the filtering of blood, comprising a filter catheter with an elongated filter at its distal end for filtering the blood branching downstream behind the heart valve into the arteries to supply the brain and the arms, wherein the filter merges at its proximal end into a catheter tube and wherein the filter may be pushed out of the catheter in the distal direction, and the filter is longer than a section in the aortic arch in which the arteries which supply the brain and the arms branch off, subsequently described as the aortic arch section, and the filter is so designed that in the area upstream of these arteries it fits tightly against the ascending aorta, at least with its distal end section, wherein the filter either tapers from the distal to the proximal end or the filter has a distal tubular filter section and a proximal section which tapers from the distal filter section to the catheter tube.
- 16. Method of filtering blood in the area of the arteries of the aortic arch which supply the brain and the arms, wherein a filter catheter is inserted in a vessel section downstream of the aortic arch, against the direction of blood flow, and is located in the aortic arch in the area of the arteries which supply the brain and the arms, wherein the filter has a distal filter section and a proximal section, and the distal filter section has filter openings, and the proximal section has one or more openings which are larger than the filter openings of the distal filter section and has at its distal end an expandable filter which may be pushed in and out and which is radially unfolded until at least its distal end is in contact with the vessel wall in the direction of flow before the bifurcation points of the arteries which supply the brain and the arms.
Specification