# US 8,769,796 B2 · Selective stent crimping > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,769,796 B2 - Document ID: US8769796B2 - Status: Granted - Kind: B2 - Application number: 13/071,239 - Filed: 2011-03-24 - Published: 2011-12-15 - Granted: 2014-07-08 - Earliest claimed: 2008-09-25 - Assignees: Advanced Bifurcation Systems Inc. - Applicants: Henry Bourang; Mehran Khorsandi - Inventors: Henry Bourang; Mehran Khorsandi - Web page: https://patentgrep.com/patent/US8769796B2 ## CPC - A61F 2/954: for placing stents or stent-grafts in a bifurcation - A61F 2/856: Single tubular stent with a side portal passage - A61F 2/9524: {Iris-type crimpers} - A61F 2/958: Inflatable balloons for placing stents or stent-grafts - A61L 31/16: Biologically active materials, e.g. therapeutic substances {(A61L31/047 takes precedence)} - A61F 2/9522: {Means for mounting a stent or stent-graft onto or into a placement instrument} - A61F 2/97: the outer sleeve being splittable - A61F 2002/061: {provided with means for allowing access to secondary lumens} - A61F 2230/001: Figure-8-shaped, e.g. hourglass-shaped - A61F 2250/0039: differing in diameter - A61F 2250/006: modular - A61M 2025/1045: {for treating bifurcations, e.g. balloons in y-configuration, separate balloons or special features of the catheter for treating bifurcations} - A61M 2025/1079: {having radio-opaque markers in the region of the balloon} - Y10T 29/49908: Joining by deforming - Y10T 29/49913: by constricting outer annulus - 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) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Methods for crimping a stent on an expandable member of a delivery catheter, and devices and methods for treating a bifurcation are disclosed. A method for crimping includes positioning a stent having a first portion and a second portion over the expandable member, and non-uniformly crimping the stent to the expandable member. The method can include routing an elongate shaft under the second portion of the stent and through the side hole so as to be routed external to the first portion. The stent second portion can be crimped so that the elongate shaft can be slidably disposed relative to the stent second portion prior to deployment of the stent. ## Claims ### Claim 1 A method of crimping a stent on an expandable member of a delivery catheter, the method comprising: positioning a stent over an expandable member, the stent having a distal-most first end and a proximal-most second end, wherein a first portion and a second portion respectively extend between the distal-most first end and proximal-most second end, the stent comprising a sidewall having a side hole therethrough; routing an elongate shaft under the second portion of the stent and through the side hole so as to be routed external to the first portion; and non-uniformly crimping the stent to the expandable member, wherein the expandable member comprises a delivery balloon extending between and beyond both the distal-most first end and the proximal-most second end, wherein the stent is non-uniformly crimped such that only a segment of the second portion is embedded in the delivery balloon and the second portion is partially crimped to the expandable member such that the second portion remains uncrimped to the expandable member over a sector of the expandable member; and wherein crimping the stent second portion comprises: positioning a spacer between a sector of the elongate shaft and a sector of the stent second portion; crimping the sector of the stent second portion into contact with the spacer; and removing the spacer, wherein the elongate shaft is slidably disposed relative to the stent second portion prior to deployment of the stent. ### Claim 2 (depends on 1) The method of claim 1, wherein the first portion is disposed distal to the side hole and the second portion is disposed proximal to the side hole. ### Claim 3 (depends on 1) The method of claim 1, wherein the first portion is crimped using a constricting orifice. ### Claim 4 (depends on 1) The method of claim 1, further comprising: applying a vacuum pressure to the expandable member; and checking for leaks while the vacuum pressure is applied to the expandable member. ### Claim 5 (depends on 1) The method of claim 1, further comprising: at least partially inflating the expandable member; and checking for leaks while the expandable member is at least partially inflated. ### Claim 6 (depends on 1) The method of claim 1, further comprising partially crimping the second portion to the expandable member to allow slidable movement of an elongate shaft under the second portion. ### Claim 7 (depends on 1) The method of claim 1, wherein the first portion and the second portion are crimped while still permitting an elongate shaft to slidably pass through the side hole. ### Claim 8 (depends on 1) The method of claim 1, wherein the stent second portion is crimped using a constricting orifice. ### Claim 9 (depends on 1) The method of claim 1, wherein: the stent second portion comprises a side wall having a plurality of apertures therethrough; and the expandable member at least partially protrudes into one or more of the apertures. ### Claim 10 (depends on 1) The method of claim 1, wherein the spacer comprises a protective sheath. ### Claim 11 (depends on 1) The method of claim 1, further comprising partially inflating the expandable member before or during the crimping of the stent second portion. ### Claim 12 (depends on 1) The method of claim 1, wherein a sector of the second portion is not crimped to a sector of the expandable member. ### Claim 13 (depends on 1) The method of claim 1, wherein the entirety of the first portion of the stent is embedded in the delivery balloon. ### Claim 14 (depends on 1) The method of claim 1, further comprising heating at least one of the expandable member or the stent second portion before or during the crimping of the stent second portion. ### Claim 15 (depends on 14) The method of claim 14, wherein the at least one of the expandable member or the stent second portion are heated to a temperature ranging from about 50 degrees Celsius to about 65 degrees Celsius. ### Claim 16 (depends on 1) The method of claim 1, wherein crimping the stent second portion comprises crimping a sector of the stent second portion into contact with the elongate shaft. ### Claim 17 (depends on 16) The method of claim 16, wherein the elongate shaft is slidably disposed relative to the stent second portion after deployment of the stent. ### Claim 18 (depends on 1) The method of claim 1, further comprising coating the stent with a therapeutic agent. ### Claim 19 (depends on 18) The method of claim 18, wherein the therapeutic agent inhibits restenosis. ### Claim 20 (depends on 1) The method of claim 1, wherein the first portion is uniformly crimped to the expandable member and the second portion is non-uniformly crimped to the expandable member. ### Claim 21 (depends on 20) The method of claim 20, wherein the first portion of the stent is uniformly crimped circumferentially and longitudinally therealong. ### Claim 22 (depends on 20) The method of claim 20, wherein the second portion of the stent is non-uniformly crimped circumferentially therealong. ### Claim 23 (depends on 1) The method of claim 1, wherein: the stent comprises a sidewall having a plurality of apertures therethrough; and the expandable member at least partially protrudes into one or more of the apertures. ### Claim 24 (depends on 23) The method of claim 23, further comprising partially inflating the expandable member before or during the crimping. ### Claim 25 (depends on 24) The method of claim 24, wherein the expandable member is inflated during the crimping to a pressure ranging from about 50 psi to about 100 psi. ### Claim 26 (depends on 23) The method of claim 23, further comprising heating at least one of the expandable member or the stent before or during the crimping. ### Claim 27 (depends on 26) The method of claim 26, wherein the at least one expandable member or stent are heated to a temperature ranging from about 50 degrees Celsius to about 65 degrees Celsius.