# US 11,382,777 B2 · Stents having radiopaque mesh > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,382,777 B2 - Document ID: US11382777B2 - Status: Granted - Kind: B2 - Application number: 16/564,913 - Filed: 2019-09-09 - Published: 2019-12-26 - Granted: 2022-07-12 - Earliest claimed: 2006-02-22 - Assignees: Covidien LP - Applicants: Covidien LP - Inventors: Steven G. Zaver; Brian S. Carion; Richard S. Kusleika - Web page: https://patentgrep.com/patent/US11382777B2 ## CPC - A61F 2/90: characterised by a net-like or mesh-like structure - A61F 2/0105: {Open ended, i.e. legs gathered only at one side} - A61F 2/06: Blood vessels - A61F 2/844: folded prior to deployment - A61F 2002/016: {made from wire-like elements} - A61F 2002/018: {made from tubes or sheets of material, e.g. by etching or laser-cutting} - A61F 2230/0006: circular - A61F 2230/0067: conical - A61F 2250/0018: differing in elasticity, stiffness or compressibility - A61F 2250/0032: differing in radiographic density - A61F 2250/0098: radio-opaque, e.g. radio-opaque markers - A61F 2310/00071: Nickel or Ni-based alloys - A61F 2310/00137: Tungsten or W-based alloys - A61F 2310/00149: Platinum or Pt-based alloys - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract A stent including a mesh made of strands. The mesh has at least one radiopaque strand and at least one non-radiopaque strand, and the at least one radiopaque strand and the at least one non-radiopaque strand each have different diameters. Each strand has an index of wire stiffness EI, where EI is the mathematical product of the Young's modulus (E) and the second moment of area (I). The EI of all strands in the mesh is no more than five times the EI of the strand having the smallest EI of any of the strands. ## Claims ### Claim 1 A device for filtering emboli from blood flowing through a lumen defined by the walls of a vessel in a patient's body, comprising: a filter element being expandable from a collapsed configuration when the filter element is restrained to an expanded configuration when the filter element is unrestrained, wherein the filter element comprises a mesh comprising strands, each strand having a cross-sectional dimension, the mesh comprising at least one radiopaque strand and at least one non-radiopaque strand, the at least one radiopaque strand and the at least one non-radiopaque strand each having different cross-sectional dimensions, and wherein a Young's modulus of the at least one radiopaque strand is different than a Young's modulus of the at least one non-radiopaque strand. ### Claim 2 (depends on 1) The device of claim 1, further comprising an elongate support member and wherein the filter element is carried on a portion of the elongate support member. ### Claim 3 (depends on 1) The device of claim 1, wherein the filter element has proximal and distal portions and a central portion, the filter element having a shape in the expanded configuration which defines a cavity having a proximal facing opening. ### Claim 4 (depends on 3) The device of claim 3, wherein the filter element has a proximal facing opening portion and this portion is radiopaque. ### Claim 5 (depends on 1) The device of claim 1, wherein the filter element is self-expanding. ### Claim 6 (depends on 1) The device of claim 1, wherein the mesh is tubular. ### Claim 7 (depends on 6) The device of claim 6, wherein the mesh is braided. ### Claim 8 (depends on 1) The device of claim 1, wherein the Young's modulus of the at least one radiopaque strand is less than the Young's modulus of the at least one non-radiopaque strand. ### Claim 9 (depends on 1) The device of claim 1, wherein the Young's modulus of the at least one radiopaque strand is greater than the Young's modulus of the at least one non-radiopaque strand. ### Claim 10 (depends on 1) The device of claim 1, wherein the at least one radiopaque strand has a larger cross-sectional dimension than the at least one non-radiopaque strand. ### Claim 11 (depends on 1) The device of claim 1, wherein the largest cross-sectional dimension of a strand is no more than two times the smallest cross-sectional dimension of any other strand. ### Claim 12 (depends on 1) The device of claim 1, wherein each strand has an index of wire stiffness EI, where EI is the mathematical product of the Young's modulus (E) and the second moment of area (I), and wherein the EI of all strands in the mesh is no more than 5 times the EI of the strand having the smallest EI of any of the strands. ### Claim 13 (depends on 1) The device of claim 1, wherein each strand has an index of wire stiffness EI, where EI is the mathematical product of the Young's modulus (E) and the second moment of area (I), and wherein the EI of all strands in the mesh is no more than 4 times the EI of the strand having the smallest EI of any of the strands. ### Claim 14 A mesh comprising strands, each strand having a diameter, the mesh comprising at least one radiopaque strand and at least one non-radiopaque strand, the at least one radiopaque strand and the at least one non-radiopaque strand each having different cross-sectional dimensions, and wherein a Young's modulus of the non-radiopaque strand is different than a Young's modulus of the radiopaque strand. ### Claim 15 (depends on 14) The mesh of claim 14, wherein the mesh is tubular. ### Claim 16 (depends on 15) The mesh of claim 15, wherein the mesh is braided. ### Claim 17 (depends on 14) The mesh of claim 14, wherein the Young's modulus of the at least one radiopaque strand and the Young's modulus of the at least one non-radiopaque strand differ by 10 percent or more. ### Claim 18 (depends on 14) The mesh of claim 14, wherein the Young's modulus of the radiopaque strand and the Young's modulus of the non-radiopaque strand differ by 20 percent or more. ### Claim 19 (depends on 14) The mesh of claim 14, wherein the at least one radiopaque strand is made of homogeneous metal or metal alloy. ### Claim 20 (depends on 14) The mesh of claim 14, wherein the Young's modulus of the at least one radiopaque strand is less than the Young's modulus of the at least one non-radiopaque strand. ### Claim 21 (depends on 14) The mesh of claim 14, wherein the Young's modulus of the at least one radiopaque strand is greater than the Young's modulus of the at least one non-radiopaque strand. ### Claim 22 (depends on 14) The mesh of claim 14, wherein the at least one radiopaque strand has a larger diameter than the at least one non-radiopaque strand.