# US 11,026,818 B2 · Stent with selectively covered region > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,026,818 B2 - Document ID: US11026818B2 - Status: Granted - Kind: B2 - Application number: 16/391,017 - Filed: 2019-04-22 - Published: 2019-10-24 - Granted: 2021-06-08 - Earliest claimed: 2018-04-23 - Assignees: Boston Scientific Scimed, Inc. - Applicants: Boston Scientific Scimed, Inc. - Inventors: Martyn G. Folan; Martin Burke; Gerard Duignan - Web page: https://patentgrep.com/patent/US11026818B2 ## CPC - A61F 2/04: Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts (A61F2/18, A61F2/20 take precedence; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95) - A61F 2/915: with bands having a meander structure, adjacent bands being connected to each other - A61F 2/07: Stent-grafts - A61F 2/848: having means for fixation to the vessel wall, e.g. barbs - A61F 2/95: Instruments specially adapted for placement or removal of stents or stent-grafts - A61F 2/064: {with special features to facilitate anastomotic coupling (anastomosis of natural blood vessels A61B17/11)} - A61F 2/90: characterised by a net-like or mesh-like structure - A61F 2/97: the outer sleeve being splittable - A61F 2002/009: {for hindering or preventing attachment of biological tissue} - A61F 2002/044: {Oesophagi or esophagi or gullets} - A61F 2002/045: {Stomach, intestines} - A61F 2002/075: {the stent being loosely attached to the graft material, e.g. by stitching} - A61F 2002/9155: {Adjacent bands being connected to each other} - A61F 2002/9511: {the retaining means being filaments or wires} - A61F 2210/0076: multilayered, e.g. laminated structures - A61F 2220/005: using adhesives - A61F 2220/0075: sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable - A61F 2250/0024: made from both porous and non-porous parts, e.g. adjacent parts - A61F 2250/0039: differing in diameter - A61F 2250/0051: differing in tissue ingrowth capacity, e.g. made from both ingrowth-promoting and ingrowth-preventing parts - A61F 2250/0063: Nested prosthetic parts - A61L 31/148: {Materials at least partially resorbable by the body} - 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) - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) ## Abstract A stent with a selectively covered end region. The stent includes a radially expandable tubular framework and a covering surrounding the tubular framework. The covering includes a skirt surrounding a distal end region of the tubular framework which is selectively removable from the distal end region of the tubular framework to expose the distal end region of the tubular framework to permit hyperplastic tissue ingrowth through the distal end region of the tubular framework. For example, the skirt may be folded, rolled, collapsed, or separated from the remainder of the covering to expose the distal end region of the tubular framework. ## Claims ### Claim 1 A stent comprising: a radially expandable tubular framework having a proximal end, a distal end, and a lumen extending therethrough; and a covering surrounding the tubular framework, the covering being affixed to the tubular framework at a first affixment location; the covering including a proximal region extending proximal of the first affixment location and surrounding a medial region of the tubular framework; the covering including a skirt extending distal of the first affixment location and surrounding a distal end region of the tubular framework; wherein the skirt is selectively removable from the distal end region of the tubular framework to expose the distal end region of the tubular framework; and a drawstring attached to the skirt, wherein the drawstring extends along the tubular framework to the proximal end of the tubular framework, wherein manipulation of the drawstring removes the skirt from the distal end region of the tubular framework; wherein the drawstring extends along the tubular framework between an inner surface of the proximal region of the covering and an outer surface of the tubular framework. ### Claim 2 (depends on 1) The stent of claim 1, wherein the skirt surrounds but is not directly affixed to the tubular framework distal of the first affixment location. ### Claim 3 (depends on 1) The stent of claim 1, wherein the skirt is convertible from a first configuration in which the skirt surrounds the distal end region of the tubular framework and a second configuration in which the skirt is folded upon itself proximate the first affixment location. ### Claim 4 A stent comprising: a radially expandable tubular framework having a proximal end, a distal end, and a lumen extending therethrough; and a covering surrounding the tubular framework, the covering being affixed to the tubular framework at a first affixment location; the covering including a proximal region extending proximal of the first affixment location and surrounding a medial region of the tubular framework; the covering including a skirt extending distal of the first affixment location and surrounding a distal end region of the tubular framework; wherein the skirt is selectively removable from the distal end region of the tubular framework to expose the distal end region of the tubular framework; wherein the skirt is convertible from a first configuration in which the skirt surrounds the distal end region of the tubular framework and a second configuration in which the skirt surrounds the proximal region of the covering proximal of the first affixment location. ### Claim 5 A stent comprising: a radially expandable tubular framework having a proximal end, a distal end, and a lumen extending therethrough; a covering surrounding the tubular framework, the covering being affixed to the tubular framework at a first affixment location; the covering including a proximal region extending proximal of the first affixment location and surrounding a medial region of the tubular framework; the covering including a skirt extending distal of the first affixment location and surrounding a distal end region of the tubular framework; wherein the skirt is selectively removable from the distal end region of the tubular framework to expose the distal end region of the tubular framework; and a preferential tear line configured to selectively separate the skirt from the proximal region of the covering, the preferential tear line extending circumferentially around the covering distal of the first affixment location. ### Claim 6 (depends on 1) The stent of claim 1, wherein the drawstring passes radially inward of the first affixment location as the drawstring passes distally from the proximal region of the covering to the skirt. ### Claim 7 (depends on 1) The stent of claim 1, wherein a proximal end of the proximal region of the covering is affixed to the tubular framework at a second affixment location, wherein the second affixment location is spaced proximally away from the first affixment location. ### Claim 8 (depends on 1) The stent of claim 1, wherein the skirt extends distal of the distal end of the tubular framework a distance of 20 millimeters or more. ### Claim 9 A stent comprising: a radially expandable tubular framework having a proximal end, a distal end, and a lumen extending therethrough, the tubular framework including a proximal end region extending to the proximal end of the tubular framework, a distal end region extending to the distal end of the tubular framework, and a cylindrical medial region extending between the proximal end region and the distal end region; a covering surrounding the tubular framework, the covering being affixed to the tubular framework at a first affixment location and at a second affixment location, the first affixment location positioned proximate a junction between the distal end region and the medial region of the tubular framework, and the second affixment location positioned proximate a junction between the proximal end region and the medial region of the tubular framework; the covering including a proximal region located proximal of the first affixment location and surrounding the medial region of the tubular framework; the covering including a skirt located distal of the first affixment location and surrounding the distal end region of the tubular framework; wherein the skirt is selectively removable from the distal end region of the tubular framework to expose the distal end region of the tubular framework; and a drawstring attached to the skirt, wherein the drawstring extends along the tubular framework to the proximal end of the tubular framework, wherein manipulation of the drawstring removes the skirt from the distal end region of the tubular framework. ### Claim 10 (depends on 9) The stent of claim 9, wherein a proximal end of the covering is located at the second affixment location such that the proximal end region of the tubular framework is devoid of the covering and is uncovered to permit hyperplastic tissue ingrowth through the proximal end region of the tubular framework. ### Claim 11 (depends on 9) The stent of claim 9, wherein the drawstring passes radially inward of the first and second affixment locations as the drawstring passes distally from the proximal end of the tubular framework to the skirt. ### Claim 12 (depends on 11) The stent of claim 11, wherein the drawstring extends along the medial region of the tubular framework between an inner surface of the proximal region of the covering and an outer surface of the tubular framework. ### Claim 13 A stent delivery system comprising: an elongate shaft having a handle at a proximal end thereof; a radially expandable stent disposed on a distal region of the elongate shaft; the stent including: a radially expandable tubular framework having a proximal end, a distal end, and a lumen extending therethrough; and a covering surrounding the tubular framework, the covering being affixed to the tubular framework at a first affixment location; the covering including a proximal region extending proximal of the first affixment location and surrounding a medial region of the tubular framework; the covering including a skirt extending distal of the first affixment location and surrounding a distal end region of the tubular framework; wherein the skirt is selectively removable from the distal end region of the tubular framework to expose the distal end region of the tubular framework; a drawstring extending from the skirt to the handle, wherein manipulation of the drawstring removes the skirt from the distal end region of the tubular framework. ### Claim 14 (depends on 13) The stent delivery system of claim 13, a thread surrounding the stent to constrain the stent in a radially contracted configuration on the distal region of the elongate shaft. ### Claim 15 (depends on 13) The stent delivery system of claim 13, wherein the drawstring loops through a grommet on the skirt. ### Claim 16 (depends on 13) The stent delivery system of claim 13, wherein the drawstring passes through an opening into a lumen of the elongate shaft proximal of the stent and extends through the lumen of the elongate shaft to the handle. ### Claim 17 (depends on 13) The stent delivery system of claim 13, wherein the skirt surrounds but is not directly affixed to the tubular framework distal of the first affixment location.