Stent
First Claim
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1. An aneurysm stent for implantation into a living body for the treatment of aneurysms, the stent comprising:
- a compressed state for positioning the stent in a vessel and an expanded state for treating the aneurysm, the aneurysm stent having a grid or mesh structure comprising non-covered stent cells and covered stent cells, wherein the stent cells are compressed when the stent is in the compressed state, wherein each covered stent cell contains a membrane, the membrane having a non-porous or closed structure to reduce fluid permeability in a region of the membrane, and wherein each entire membrane is provided in the corresponding covered stent cell within a thickness of that stent cell so that each membrane does not project beyond a thickness of the grid or mesh structure.
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Abstract
The present invention relates to an aneurysm stent for implantation into a living body, in particular for treatment of aneurysms, in order to implant the stent in the compressed state in a vessel and expand the stent after positioning it in the vessel, having a grid or mesh structure and at least one membrane (2) or a plurality of membranes (2) for covering at least one or more stent cells (1; 3) in the grid or mesh structure, thereby matching the permeation characteristics of the stent structure to the particular characteristics of the aneurysm.
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Citations
16 Claims
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1. An aneurysm stent for implantation into a living body for the treatment of aneurysms, the stent comprising:
a compressed state for positioning the stent in a vessel and an expanded state for treating the aneurysm, the aneurysm stent having a grid or mesh structure comprising non-covered stent cells and covered stent cells, wherein the stent cells are compressed when the stent is in the compressed state, wherein each covered stent cell contains a membrane, the membrane having a non-porous or closed structure to reduce fluid permeability in a region of the membrane, and wherein each entire membrane is provided in the corresponding covered stent cell within a thickness of that stent cell so that each membrane does not project beyond a thickness of the grid or mesh structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for producing an aneurysm stent, the method comprising:
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preparing a stent structure from a material having shape memory characteristics with webs, the stent structure having first and second stent cells formed between the webs, the stent structure compressible into a compressed state in which the stent cells are compressed; and in each of the first stent cells, attaching a membrane to the webs of the first stent cell such that the second stent cells are not covered by the membrane, each membrane having a non-porous or closed structure to reduce fluid permeability in a region of the membrane, and wherein each entire membrane is provided in the corresponding first stent cell within a web thickness of the corresponding first stent cell so that the membrane does not project beyond the stent structure. - View Dependent Claims (13, 14, 15, 16)
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Specification