WO2004016150A2 - Aneurysm stent - Google Patents
Aneurysm stent Download PDFInfo
- Publication number
- WO2004016150A2 WO2004016150A2 PCT/US2003/025430 US0325430W WO2004016150A2 WO 2004016150 A2 WO2004016150 A2 WO 2004016150A2 US 0325430 W US0325430 W US 0325430W WO 2004016150 A2 WO2004016150 A2 WO 2004016150A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aneurysm
- base
- connector
- stent
- coil
- Prior art date
Links
- 206010002329 Aneurysm Diseases 0.000 title claims abstract description 165
- 239000000463 material Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 13
- 238000012856 packing Methods 0.000 claims description 10
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- 210000004369 blood Anatomy 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 206010053567 Coagulopathies Diseases 0.000 claims description 5
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- 201000008450 Intracranial aneurysm Diseases 0.000 description 1
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- 229910001260 Pt alloy Inorganic materials 0.000 description 1
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- A61F2002/9155—Adjacent bands being connected to each other
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- A61F2002/9155—Adjacent bands being connected to each other
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- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
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- A61F2/966—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
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Definitions
- ANEURYSM STENT The present invention claims the benefit of United States Provisional Application Serial Number 60/404,422, filed August 19, 2002, titled CEREBRAL ANEURYSM COIL STENT, incorporated herein by reference.
- the present invention relates to the surgical repair of aneurysms and, more particularly, to a patch that provides a seal between the arterial wall and a neck of the aneurysm to inhibit flow in the aneurysm.
- An aneurysm is a blood-filled dilation of a blood vessel.
- Major concerns with aneurysms revolve around rupturing of the arterial wall causing internal bleeding and clots breaking away from the aneurysm causing strokes.
- the first method of treatment includes surgical treatment.
- the second method of treatment includes endovascular treatment. Surgical removal of the aneurysm is sometimes not possible, leaving endovascular treatment as the only available option. Even when not the only option, endovascular treatment often is preferred because of the reduced risks and complications.
- endovascular treatment of an aneurysm involves "packing" the aneurysm such that an endovascular occlusion is formed.
- Packing the aneurysm with coils such as Guglielmi Detachable Coils (or GDCs)
- GDCs Guglielmi Detachable Coils
- the aneurysm can be packed with numerous devices, such as, for example, other types of coils, balloons, glues, polymers, clotting agents, liners, or the like.
- Endovascular treatment while considered less risky than surgical treatment, has drawbacks.
- One drawback of endovascular treatment of the aneurysm includes the potential to over pack the aneurysm.
- aneurysm Over packing the aneurysm can cause the material to enter the parent blood vessel, potentially inhibiting blood flow or generate undesirable pressure in the aneurysm. Also, some aneurysms have a wide connection to the blood vessel, a.k.a. wide neck aneurysms. Wide neck aneurysms have the additional risk that the occluded material will break free of the aneurysm and enter the parent blood vessel, potentially causing blockage of the parent blood vessel. Finally, clotting agents and polymers used to form occlusions in the aneurysm can seep to the parent blood vessel causing complications. Balloons and liners are intuitively pleasing as a solution, but have the potential for an inexact fit causing complications. For example, a balloon may be over inflated causing unwanted pressure or under inflated causing seepage in the aneurysm.
- FIG. 1 shows the Wallace device 10 in some detail.
- the device 10 is placed inside aneurysm 50 using a catheter 46 and deployment tool 44.
- device 10 When inside the aneurysm 50, device 10 has walls 12 that expand or unfold to contact the inside of the aneurysm 50 and block neck 51. But the device resides internal to aneurysm 50 allowing blood flow shown by arrow A in the parent vessel 52 to push up against the walls 12.
- the upward pressure of the blood vessel on the wall 12 may allow blood from the parent vessel to seep in aneurysm 50.
- the neck 12 has the potential to expand.
- Other types of internal devices include liners and other neck bridges.
- Devices to block the neck of the aneurysm external to the aneurysm exist also. These devices use the pressure of the blood vessel to help seat the block against the parent vessel wall and shield the neck from the blood vessel.
- One such device is shown in United States Patent No. 6,309,367, issued October 30, 2001, to Boock, titled Aneurysm Shield.
- the Boock device is shown in FIG. 2.
- the Boock device 30 has a cylindrical shaft 32 that covers the neck 37 of the aneurysm 38 and is anchored by anchor rings 34 and 36. While device 30 resides external to the aneurysm it has multiple parts that could break free or deteriorate that reside in the parent vessel.
- Boock device 30 While the Boock device 30 seemingly works for its intended purpose in theory, its relatively large size and surface area makes its impractical to actually use. In the brain, for example, multiple blood vessels may branch off from the location of an aneurysm. Attempting to use the Boock device would block blood flow to one or more of the branch vessels as well as the aneurysm, which makes the Boock device useful in only limited situations, if any. Thus, it would be desirous to develop and improve internal and external aneurysm stents.
- apparatuses to inhibit the flow of blood to an aneurysm comprise a base and connector.
- the base has a vessel facing side and an aneurysm facing side, and is shaped to cover an aneurysm sufficiently.
- the connector is coupled to the aneurysm facing side of the base such that when deployed the connector is adapted to extend partially into the aneurysm to anchor the base about the aneurysm and inhibit flow into the aneurysm.
- FIG. 1 shows a prior art aneurysm device
- FIG. 2 shows a prior art aneurysm device
- FIG. 3 shows a perspective view of an aneurysm stent deployed in a blood vessel illustrative of the present invention
- FIG. 4 shows a cross section of a blood vessel with an aneurysm prior to deployment of the aneurysm stent illustrated in FIG. 3;
- FIG. 5 shows a cross section of the aneurysm stent just prior to deployment
- FIG. 6 shows a cross section of the aneurysm stent mostly deployed about the aneurysm
- FIG. 7 shows a cross section of the aneurysm stent deployed
- FIG. 8 shows a cross section of a portion of a stent consistent with the present invention
- FIGS. 9A and 9B show a stent consistent with the present invention.
- FIGS. 10A and 10B show a cross-section of a stent consistent with the present invention.
- FIG. 3 shows an aneurysm stent 300 consistent with an embodiment of the present invention deployed.
- Stent 300 is deployed in a parent blood vessel 302, which is shown as an artery but could be a vein a capillary, or the like, about aneurysm 304.
- a blood flow path from vessel 302 to aneurysm 304 is provided by an aneurysm neck 306.
- Neck 306 is shown as a narrow neck, but could be a wide neck.
- Aneurysm 304 is shown packed with conventional GDCs 308.
- aneurysm 304 could be packed with any type of packing agent, such as, for example, other types of coils, balloons, glues, polymers, clotting agents, liners, or the like. In fact, aneurysm 304 does not need to be packed at all as stent 300 blocks blood flow to aneurysm 304.
- the attachment of stent 300 to cover neck 306 will depend, in part, on the type of material used to pack aneurysm 304, if any.
- FIG. 3 which illustrates aneurysm 304 packed with conventional GDCs 308, stent 300 includes a base 310, a base connection point 312, and a connector 314.
- Base 310 has opposed sides, a vessel side and a wall side (not specifically labeled).
- the vessel side can be covered with a graft material or other biocompatible material.
- the vessel side may be coated with a material to stimulate cell growth and encourage formation of a pseudointima.
- the wall side could be covered with an adhesive to assist in seating stent 300 about neck 306 by forming a seal between base 310 and vessel 302.
- Base connection point 312 couples base 310 to connector 314.
- Base connection point 312 does not need to exist as a separate component, but is identified for convenience to distinguish between base 310 and connector 314.
- Base connection point 312 could, as a matter of design choice, be a fitting to connect base 310 and connector 314 if desired.
- Connector 314 can be a conventional coil material attached to base 312 that extends to GDCs 308. When deployed, connector 314 assumes its coiled shape and engages GDCs 308 to assist in keeping stent 300 seated about neck 306. Connector 314 could physically curl around or hook into GDCs 308 for anchoring, but connector 314 could simply pack in aneurysm 304 similar to a conventional GDC. Connector 314 could simply anchor stent 300 in place, but could also contract and pull base 310 snug against vessel 302 to firmly seat base 310 about aneurysm neck 306 further inhibiting blood flow to aneurysm 304.
- connection point 312 and one connector 314 While only one base connection point 312 and one connector 314 is shown in FIG. 3, multiple connections and connectors are possible. Also, the connections do not necessarily have to be in the center of the stent, but could be offset. It is believed greater stability will be obtained by symmetrical placement of connectors and connection points, but asymmetrical placement is possible. Multiple connectors could be attached to a single connection point as well.
- FIGS. 4-7 a method of deploying the stent 300 will be described.
- parent vessel 302 is shown with aneurysm 304 and neck 306 existing off the main body of vessel 302.
- a second vessel 402 resides about neck 306 forming a junction 404.
- aneurysm 304 is packed using, for example, conventional GDCs 308 in a conventional manner. Without going in much detail, GDCs 308 are placed by first directing a catheter 406 to the site of aneurysm 304.
- GDCs 308 are passed through catheter 406 and packed in aneurysm 304 in a conventional manner. Once GDCs 308 are placed, stent 300 is passed through the same or a different catheter 406 using a guide wire 502 (FIG. 5). Stent 300 includes base 310 and connector 314. As can be seen, base 310 is compacted to pass through catheter 406. Also, connector 314 enters the packed GDCs 308.
- stent 300 has exited catheter 406 and guide wire 502 can be seen attached to stent 300.
- Base 310 is approaching neck 306 and connector 314 has extended in GDCs 308 packed in aneurysm 304.
- base 310 can be made of a self- expanding material that begins expanding on exiting catheter 406.
- base 310 can be made of a material that requires activation or other manipulation to expand.
- stent 300 is shown in the appropriate position and guide wire 502 has been withdrawn.
- Base 310 has expanded sufficiently to mostly block neck 306 and connector 314 has begun curling, packing, embedding or otherwise anchoring in aneurysm.
- connector 314 can be placed about GDCs 308 as conventional packing material, connector 314 can curl and engage GDCs 308, or the like. While one connector 314 is shown, it would be possible to have two of more connectors 314. As described in more detail below, a number of other devices and techniques can be used to anchor stent 300 about the neck.
- stent 300 is shown with base 310 and connector coils 314 fully deployed.
- base 310 is flush with the wall of vessel 302, wraps around junction 404 and is flush with the wall of vessel 402.
- Connectors 314 are engaged with GDCs 308 and, optionally, connectors 314 contract in a manner that pulls base 310 in toward GDCs 308 providing a snug seating between base 310 and vessel 302.
- the stent 300 could be made of many materials. Some material includes conventional graft material. Alternatively, stent 300 could be made of one or more shaped memory alloys (SMAs) or a combination of graft material and SMAs. SMAs are a group of materials that demonstrate an ability to return to some previously defined shape or size when subjected to the appropriate thermal procedure. Generally, these materials can be plastically deformed and, upon exposure to thermal manipulation, will return to the pre-deformation shape. Some SMA material is considered to be two- way shaped memory alloys because they will return to the deformed shape upon proper thermal activation.
- SMAs shaped memory alloys
- SMAs include Ag-Cd alloys, Cu-Al-Ni alloys, Cu-Sn alloys, Cu-Zn alloys, Cu-Zn-Si alloys, Cu-Zn-Sn alloys, Cu-Zn- Al alloys, In-Ti alloys, Ni-Al alloys, Ni-Ti alloys, Fe-Pt alloys, Mn-Cu alloys, Fe-Mn-Si alloys, and the like. As shown by FIGs. 4-7, SMAs would work well for stent 300 because, for example, connectors 314 could be shaped with a predefined curl that will engage GDCs 308.
- the SMA could be deformed at a predefined temperature to a straight, or substantially straight, shape to allow for connectors 314 to penetrate packed GDCs 308 in aneurysm 302. Thermal manipulation would cause connector coils 314 to assume the original curled shape that will anchor stent 300 about aneurysm 302 and may provide a force tending to pull base 310 in towards aneurysm 302 further seating stent 300 about aneurysm 302.
- base 310 could be made of SMA. In this case, base 310 could be originally shaped to approximate the shape of the vessel(s) around aneurysm neck 304 to allow for as close a fit as possible. This would also allow use of stent 300 in areas having many vessels branching around the aneurysm.
- base 310 is shown having a circular or semicircular shape.
- FIG. 3 illustrates base 310 as a coil of material that expands on deployment.
- the shape of base 310 is largely a function of material, design choice, and the aneurysm location.
- stent 300 could take many shapes including triangular, rectangular, square, elliptical, conical, spherical, circular, cylindrical, or the like
- the aneurysm could be packed with alternative material.
- the connector or anchor could be a simple post connected to the stent and embedded in the occlusion.
- Base 310 connected to the post would be held in place by the occlusion.
- Further seating force could be supplied by using a material that contracts on activation, such as SMAs.
- a connection post could be provided on the balloon or liner to allow attaching the stent to the balloon or liner.
- a balloon inserted in aneurysm 302 could have a flanged lower post (similar to some helium balloons) that connector coil 314 could wrap around.
- connector coil 314 was made out of SMAs, thermal activation could cause coil 314 to tighten around the post attached to the balloon and contract. The contraction would be resisted by the flange on the post tending to pull base 310 in towards aneurysm 302 to assist in seating base 310 about aneurysm 302.
- the stent could have prongs that extend along the inside walls of the aneurysm such that the expanded balloon or liner would press the prongs against the wall of the aneurysm and seat the stent.
- base 310 could be designed with a clamp 802 around an edge 804 of base 310.
- clamp 802 could have opposed surfaces 806 such that when deployed, surfaces 806 move together and grip vessel 302 at neck 306.
- a ridge 808 could be provided to assist in the grip.
- Clamp 802 would be particularly useful if aneurysm 304 was not packed with anything.
- FIGS. 9A and 9B another stent 900 consistent with the present invention is shown.
- Stent 900 includes a base 910 and a connector 920.
- connector 920 is a tightly wrapped coil of material.
- connector 920 unwinds into a bulbous or volumous area sufficiently to anchor the stent 900.
- Generally, connector 920 would expand to completely fill aneurysm space, but at a minimum the expansion should be sufficient to prevent connector 920 from pulling out of the aneurysm.
- stent 900 could be used to treat the aneurysm without packing material. But if packing material were used to treat the aneurysm, connector 920 would not need to expand as much.
- FIGS. 10A and 10B show another stent 1000 consistent with the present invention.
- FIG. 10A shows a front plan view of a stent 1000 that includes a base 1010 and expanded connectors 1020 and 1030. While stent 1000 is shown with two orthogonal rings as connectors 1020 and 1030, more rings could be used. Further the rings could be cross-linked or individual rings.
- FIG. 10B shows a side plan view of stent 1000 also with expanded connectors 1020 and 1030. As can be seen, connectors 1020 and 1030, which are shown in the deployed state, expand to form rings that act similar to the corkscrew anchor above.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003259830A AU2003259830A1 (en) | 2002-08-19 | 2003-08-15 | Aneurysm stent |
Applications Claiming Priority (4)
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US40442202P | 2002-08-19 | 2002-08-19 | |
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US10/455,145 | 2003-06-04 | ||
US10/455,145 US20040034386A1 (en) | 2002-08-19 | 2003-06-04 | Aneurysm stent |
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WO2004016150A2 true WO2004016150A2 (en) | 2004-02-26 |
WO2004016150A3 WO2004016150A3 (en) | 2005-05-12 |
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PCT/US2003/025430 WO2004016150A2 (en) | 2002-08-19 | 2003-08-15 | Aneurysm stent |
PCT/US2004/030758 WO2005037129A2 (en) | 2002-08-19 | 2004-09-20 | Aneurysm stent with growth factor |
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- 2003-08-15 WO PCT/US2003/025430 patent/WO2004016150A2/en not_active Application Discontinuation
- 2003-08-15 AU AU2003259830A patent/AU2003259830A1/en not_active Abandoned
- 2003-10-06 US US10/680,063 patent/US7241301B2/en not_active Expired - Lifetime
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AU2003259830A8 (en) | 2004-03-03 |
US7241301B2 (en) | 2007-07-10 |
AU2003259830A1 (en) | 2004-03-03 |
WO2005037129A2 (en) | 2005-04-28 |
WO2005037129A3 (en) | 2005-12-08 |
US20070225794A1 (en) | 2007-09-27 |
WO2004016150A3 (en) | 2005-05-12 |
US20040034386A1 (en) | 2004-02-19 |
US20040106945A1 (en) | 2004-06-03 |
US7621928B2 (en) | 2009-11-24 |
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