Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
  • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
  • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
  • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
  • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes
  • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
  • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
  • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes
  • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
  • A61F2002/91533—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other characterised by the phase between adjacent bands
  • A61F2002/91541—Adjacent bands are arranged out of phase
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
  • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
  • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes
  • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
  • A61F2002/9155—Adjacent bands being connected to each other
  • A61F2002/91558—Adjacent bands being connected to each other connected peak to peak
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • 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
  • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
  • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
  • A61F2230/0004—Rounded shapes, e.g. with rounded corners
  • A61F2230/0013—Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • 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
  • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
  • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
  • A61F2230/0028—Shapes in the form of latin or greek characters
  • A61F2230/0054—V-shaped

Definitions

• Implantable device for the treatment of a bodily canal
• the present invention generally relates to an expandable tubular device, intended to be implanted in the lumen of a bodily duct presenting a condition.
• the invention mainly finds application in the field of the treatment of blood vessels having stenoses.
• a "stent” is in particular recommended after conventional balloon angioplasty to prevent the dilated vessel from closing spontaneously, or to prevent its occlusion by the formation of a new atheromatous plaque and the constitution of a possible restenosis.
• These devices generally have an elastic conformation. They can also be made from shape memory materials.
• the second category of "stent” consists of devices whose expansion can be forced mechanically under the effect of a force exerted from the inside to the outside in a radial direction, the diameter in the expanded state being a function of the force exerted. This force can be for example that resulting from the inflation of a balloon.
• Such devices are generally produced using materials having a low elastic memory and liable to undergo irreversible plastic deformation.
• This type of device is currently the most commonly used, in particular because of a greater ease of implantation compared to self-expanding devices.
• the present invention is not limited to one of these two categories of "stent", and covers self-expanding devices or not.
• Document EP 0.540.290 describes an expandable tubular device forming a "stent" generally consisting of a substantially tubular body defined by a set of radially expandable cylindrical elements, aligned along a common longitudinal axis and connected two by two successively by a plurality of 'angularly spaced and coplanar connecting members with said cylindrical elements.
• Each cylindrical element of this known device has, in the expanded state, a length less than its initial length in the constricted state.
• the connecting members between these cylindrical elements consist of rigid rectilinear sections, so that the final length of this known device, after expansion is less than its initial length, which can cause difficulties during implantation in the body canal. .
• such a known device generally lacks longitudinal flexibility.
• the present invention aims to solve the technical problem consisting in the provision of an expandable tubular device of a new design, which has a high longitudinal flexibility and a length after implantation substantially equal to the initial length.
• the solution in accordance with the present invention, to solve this technical problem, consists of an expandable tubular device intended to be implanted in the lumen of a body conduit such as in particular a blood vessel, consisting of a substantially tubular body defined by a set of radially expandable cylindrical elements, aligned along a common longitudinal axis and successively connected two by two by a plurality of angularly spaced and coplanar connecting members with said cylindrical elements, each cylindrical element having, in the expanded state, a length less than its initial length in the tightened state, characterized in that said connecting members are capable of being elongated along the longitudinal axis to compensate for the decrease in length of said cylindrical elements during their radial expansion and in that each member link forms a ripple consisting of at least three ports U-shaped elementary ions interconnected two by two successively in the opposite direction, and whose free ends are respectively connected to two adjacent cylindrical elements.
• FIG. 1 is a plan view of the developed side surface of a device according to a first embodiment of the invention corresponding to the constricted state of this device;
• FIG. 1A is an enlarged view of detail A in FIG. 1;
• FIG. 2 is a view similar to FIG. 1, of the same device corresponding to the expanded state;
• FIG. 3 is a view similar to FIG. 1 of a device according to a second embodiment of the invention, corresponding to the tightened state;
• FIG. 4 is a view similar to FIG. 2 of the device according to the second embodiment of the invention, corresponding to the expanded state.
• FIGS. 1 to 4 therefore show an expandable tubular device, in accordance with the present invention which, for clarity of description, is shown in a planar configuration corresponding to the development of its lateral surface.
• An expandable tubular device generally consists of a body, or armature, substantially elongated tubular 1 defined by a set of radially expandable cylindrical elements, aligned along a common longitudinal axis and connected two by two successively by a plurality of angularly spaced and coplanar connecting members with said cylindrical elements.
• This device is expandable between a tightened state (FIGS. 1 and 3) allowing its intra-luminal delivery through a bodily conduit such as for example a blood vessel, and an expanded state (FIGS. 2 and 4) in which said device comes into contact. of the internal wall of said body conduit to exert a force therein in a radial direction and towards the outside allowing the treatment of a condition such as for example a stenosis.
• Such a device can be automatically expanded, for example because of its conformation or the nature of the materials of its constituent elements.
• This device can also be mechanically expanded by force under the action of a force exerted from the inside to the outside in a radial direction, for example by means of an inflatable balloon.
• each cylindrical element is generally designated by the reference numeral 2, while each connecting element is designated by the reference numeral 3.
• each connecting member 3 generally has the shape of a corrugation consisting of three elementary U-shaped portions connected together in pairs in succession in opposite directions, and the two free ends 3a, 3b of which are respectively connected, preferably by a bent portion 4a, 4b, with two adjacent cylindrical elements 2 preferably at a point located at a longitudinal end thereof as will be explained in more detail below.
• the connecting members 3 which are normally identical can be of various shapes. They will generally be in the form of a corrugation made up of at least three elementary U-shaped portions linked together in pairs in succession in opposite directions, that is to say of a corrugation comprising at least three alternating loops .
• this undulation will comprise an odd number of elementary U-shaped portions.
• the connecting members are able to be elongated along the longitudinal axis to compensate for the reduction in length of the device resulting from the reduction in length of the cylindrical elements under the effect of their radial expansion, while allowing a flexibility in bending.
• the elementary portions 5a, 5b in the shape of a U arranged at the two ends of the connecting member 3 allow, as a result of the pivoting towards the outside of their branch, the outer plus, the elongation of the connecting member 3 of a length substantially equal to the decrease in length of a cylindrical element 2 after expansion (Fig. 1A).
• the U-shaped portion (s) 6 in the form of a U arranged between the aforementioned extreme elementary portions gives the device great flexibility in bending.
• This flexibility in flexion is particularly advantageous during the routing of the device inside the vascular system since it makes it possible to best negotiate the existing curvatures and elbows.
• the bent portions 4a, 4b connecting the ends of the connecting members 3 to the adjacent cylindrical elements 2 are shaped and produced to have a rigidity greater than that of the extreme elementary connections 5a, 5b.
• each cylindrical member 2 constituting a device according to the present invention is constituted by a radially expandable network, and each cylindrical member has in the expanded state a length less than its length to l 'tight state.
• this network consists, in the constricted state, of a corrugation formed of elementary U-shaped portions arranged two by two successively in opposite directions.
• each elementary U-shaped portion are articulated at one end, and are capable of being separated from one another during the expansion of the cylindrical element 2; each elementary portion having, after expansion, a general V shape as shown in FIG. 2.
• the length L2 of the cylindrical element 2 in the expanded state is less than the length L1 of the same element in the constricted state.
• the cylindrical elements 2 are arranged two by two successively symmetrically with respect to a plane P perpendicular to their common plane disposed at equal distance from the adjacent ends 2a, 2b of these two cylindrical elements.
• each cylindrical element 2 is formed, in its constricted state, by a set of crushed rings connected two by two successively at a midpoint.
• these crushed rings deploy during the radial expansion of said elements cylindrical 2 to form a succession of diamonds linked two by two successively at two opposite vertices.
• the length L2 of each cylindrical element 2, in the expanded state is less than the length L1 of this same element, in the constricted state.
• the cylindrical elements 2 in accordance with this second embodiment of the invention are arranged two by two successively symmetrically relative to a plane P perpendicular to their common plane and disposed at equal distance from the adjacent ends 2a, 2b of these two elements.
• the connecting members 3 are connected via the bent portions 4a, 4b to the cylindrical elements 2 at a point situated at the level of a longitudinal end of these cylindrical elements, that is to say in the two embodiments shown in the figures, at the articulations allowing the deployment and expansion of the cylindrical elements 2.
• the connecting members will normally be arranged so as to be angularly spaced, preferably regularly, and coplanar with the cylindrical elements 2.
• the number of connecting member between two cylindrical elements will of course depend on the diameter of the device and therefore on the intended application. It will then generally be 3 as in the examples shown.
• an expandable tubular device in accordance with the present invention can be made of any material compatible with the body duct and the body fluids with which this device is liable to come into contact.
• Such materials can be shape memory materials such as for example stainless steel, phynox®, nitinol for the constitution of a self-expanding device, or deformable materials, with a low elastic memory, such as for example metallic materials, and especially stainless steel, tungsten, platinum, tantalum or gold.
• a device according to the invention is obtained in a manner known per se from a thin-walled hollow tube having a uniform wall thickness, either by laser cutting followed by electrochemical polishing, or by chemical treatment or electrochemical.
• the devices shown in Figures 1 to 4 were for example obtained by laser cutting of a stainless steel tube having an outside diameter of 1.3 mm and a wall thickness of 0.1 mm followed by electrochemical polishing.
• the delivery system will preferably comprise an inflatable catheter intended to be received inside the device in the tightened state, and to exert on this device a force in a radial direction from the inside to the outside under the effect of the inflation of the balloon.
• the device according to the invention can also be applied or used for fixing implants, in particular covers made of porous woven, non-woven, expanded polymers or elastic membranes for isolating aneurysms.

Landscapes

• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Cardiology (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Transplantation (AREA)
• Physics & Mathematics (AREA)
• Vascular Medicine (AREA)
• Optics & Photonics (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Prostheses (AREA)
• Media Introduction/Drainage Providing Device (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9502490

Family Applications (1)

Country Status (3)

Families Citing this family (56)

Family Cites Families (1)

• 1997
  • 1997-01-10 FR FR9700177A patent/FR2758253B1/fr not_active Expired - Fee Related
• 1998
  • 1998-01-09 WO PCT/FR1998/000037 patent/WO1998030172A1/fr not_active Ceased
  • 1998-01-09 EP EP98902053A patent/EP0951255A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events