# US 12,758,406 B2 · Stent with anti-migration feature > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,758,406 B2 - Document ID: US12758406B2 - Status: Granted - Kind: B2 - Application number: 18/145,548 - Filed: 2022-12-22 - Published: 2023-04-27 - Granted: 2026-10-13 - Earliest claimed: 2019-01-07 - Assignees: Boston Scientific Scimed, Inc. - Applicants: Boston Scientific Scimed, Inc. - Inventors: Gary Gilmartin; Matthew Montague; Louis McNern; Michael Walsh; Geraldine Toner - Web page: https://patentgrep.com/patent/US12758406B2 ## CPC - A61F 2/88: the wire-like elements formed as helical or spiral coils - A61F 2/90: characterised by a net-like or mesh-like structure - A61F 2210/0014: using shape memory or superelastic materials, e.g. nitinol - A61F 2220/0008: Fixation appliances for connecting prostheses to the body - A61F 2240/001: Designing or manufacturing processes - 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 An illustrative stent may comprise an elongated tubular member having a longitudinal axis, the elongated tubular member comprising at least one knitted filament forming a plurality of twisted knit stitches with intermediate rung portions extending circumferentially between radially adjacent twisted knit stitches. Each twisted knit stitch may be interconnected with a longitudinally adjacent twisted knit stitch forming a series of linked stitches. The elongated tubular member may be configured to move between a collapsed configuration and an expanded configuration, wherein in the collapsed configuration the series of linked stitches form longitudinal columns and in the expanded configuration the series of linked stitches extend helically around the elongated tubular member. ## Claims ### Claim 1 A stent, comprising: an elongated tubular member having a first end, a second end, and a longitudinal axis extending therebetween, the elongated tubular member formed from at least one filament, the elongated tubular member configured to move between a radially collapsed configuration when constrained and a radially expanded configuration when unconstrained, the elongated tubular member including: one or more first region in which the at least one filament defines a first knit stitch pattern including a plurality of twisted knit stitches each including a closed loop portion with a crossed base portion in which a portion of the at least one filament forming the closed loop portion crosses over itself, wherein each twisted knit stitch has the crossed base portion in both the radially collapsed configuration and the radially expanded configuration; and one or more second region in which the at least one filament defines a second knit stitch pattern different from the first knit stitch pattern, wherein a longitudinal end of the first region is connected to a longitudinal end of the second region; wherein the one or more first region and the one or more second region each extends around an entire circumference of the elongated tubular member. ### Claim 2 (depends on 1) The stent of claim 1, wherein the second knit stitch pattern includes a plurality of parallel knit stitches each defined by an incomplete loop having an open base. ### Claim 3 (depends on 1) The stent of claim 1, wherein the plurality of twisted knit stitches forms a series of linked stitches, wherein when in the radially collapsed configuration the series of linked stitches form longitudinal columns of twisted knit stitches and in the radially expanded configuration the series of linked stitches extend helically around the elongated tubular member such that each of the plurality of twisted knit stitches in each series of linked stitches is circumferentially offset from a longitudinally adjacent twisted knit stitch. ### Claim 4 (depends on 1) The stent of claim 1, wherein an entirety of the elongated tubular member is formed by a single filament. ### Claim 5 (depends on 1) The stent of claim 1, wherein a single first region defines the first end of the elongated tubular member and a single second region defines the second end of the elongated tubular member. ### Claim 6 (depends on 5) The stent of claim 5, wherein the single first region and the single second region each define 50% of an overall length of the elongated tubular member. ### Claim 7 (depends on 5) The stent of claim 5, wherein the single first region has a length less than a length of the single second region. ### Claim 8 (depends on 1) The stent of claim 1, wherein the one or more first region includes a proximal first region defining the first end of the elongated tubular member and a distal first region defining the second end of the elongated tubular member, and the one or more second region defines a middle portion of the elongated tubular member disposed between the first end and the second end. ### Claim 9 (depends on 8) The stent of claim 8, wherein the proximal and the distal first regions make up to 25% of an overall length of the elongated tubular member. ### Claim 10 (depends on 1) The stent of claim 1, wherein the closed loop portion of at least some of the twisted knit stitches is wrapped around the crossed base portion of a longitudinally adjacent twisted knit stitch. ### Claim 11 (depends on 3) The stent of claim 3, wherein the at least one filament forms rungs extending circumferentially between radially adjacent twisted knit stitches, wherein when in the radially expanded configuration the rungs define an outer surface of the elongated tubular member and the crossed base portion of each twisted knit stitch extends radially outward from the outer surface. ### Claim 12 (depends on 11) The stent of claim 11, wherein the crossed base portions form a raised ridge extending helically around the elongated tubular member in the radially expanded configuration. ### Claim 13 (depends on 12) The stent of claim 12, wherein the raised ridge has a longitudinal cross-sectional wave shape, with a first slope facing a proximal end of the elongated tubular member, a crest, and a pocket facing a distal end of the elongated tubular member, wherein when inserted within a body lumen, the raised ridge resists distal movement while allowing removal in a proximal direction. ### Claim 14 A stent, comprising: an elongated tubular member having a first end, a second end, and a longitudinal axis extending therebetween, an entirety of the elongated tubular member formed from a single filament, the elongated tubular member configured to move between a radially collapsed configuration when constrained and a radially expanded configuration when unconstrained, the elongated tubular member including: one or more first region in which the filament defines a first knit stitch pattern including a plurality of twisted knit stitches each including a closed loop portion with a crossed base portion in which the filament forming the closed loop portion crosses over itself, wherein each twisted knit stitch has the crossed base portion in both the radially collapsed configuration and the radially expanded configuration; and one or more second region in which the filament defines a second knit stitch pattern including a plurality of parallel knit stitches each defined by an incomplete loop having an open base, wherein a longitudinal end of the first region is directly connected to a longitudinal end of the second region; wherein the one or more first region and the one or more second region each extends around an entire circumference of the elongated tubular member. ### Claim 15 (depends on 14) The stent of claim 14, wherein a single first region defines the first end of the elongated tubular member and a single second region defines the second end of the elongated tubular member. ### Claim 16 (depends on 14) The stent of claim 14, wherein the one or more first region includes a proximal first region defining the first end of the elongated tubular member and a distal first region defining the second end of the elongated tubular member, and the one or more second region defines a middle portion of the elongated tubular member disposed between the first and the second ends. ### Claim 17 (depends on 14) The stent of claim 14, wherein the plurality of twisted knit stitches forms a series of linked stitches, wherein when in the radially collapsed configuration the series of linked stitches form longitudinal columns of twisted knit stitches and in the radially expanded configuration the series of linked stitches extend helically around the elongated tubular member such that each of the plurality of twisted knit stitches in each series of linked stitches is circumferentially offset from a longitudinally adjacent twisted knit stitch. ### Claim 18 (depends on 17) The stent of claim 17, wherein the at least one filament forms rungs extending circumferentially between radially adjacent twisted knit stitches, wherein when in the radially expanded configuration the rungs define an outer surface of the elongated tubular member and the crossed base portion of each twisted knit stitch extends radially outward from the outer surface. ### Claim 19 (depends on 18) The stent of claim 18, wherein the crossed base portions form a raised ridge extending helically around the elongated tubular member in the radially expanded configuration. ### Claim 20 A stent, comprising: an elongated tubular member having a first end, a second end, and a longitudinal axis extending therebetween, the elongated tubular member formed from at least one filament, the elongated tubular member including: one or more first region in which the at least one filament defines a first knit stitch pattern including a plurality of twisted knit stitches each including a closed loop portion with a crossed base portion in which a portion of the at least one filament forming the closed loop portion crosses over itself; and one or more second region in which the at least one filament defines a second knit stitch pattern including a plurality of parallel knit stitches each defined by an incomplete loop having an open base, wherein a longitudinal end of the first region is connected to a longitudinal end of the second region; wherein the plurality of twisted knit stitches forms a series of linked stitches, wherein the elongated tubular member is configured to move between a radially collapsed configuration when constrained and a radially expanded configuration when unconstrained, wherein when in the radially collapsed configuration the series of linked stitches form longitudinal columns of twisted knit stitches and in the radially expanded configuration the series of linked stitches extend helically around the elongated tubular member such that each of the plurality of twisted knit stitches in each series of linked stitches is circumferentially offset from a longitudinally adjacent twisted knit stitch; wherein each twisted knit stitch has the crossed base portion in both the radially collapsed configuration and the radially expanded configuration; wherein the one or more first region and the one or more second region each extends around an entire circumference of the elongated tubular member.