EP0951255A1 - Device capable of being implanted for treating a corporeal duct - Google Patents
Device capable of being implanted for treating a corporeal ductInfo
- Publication number
- EP0951255A1 EP0951255A1 EP98902053A EP98902053A EP0951255A1 EP 0951255 A1 EP0951255 A1 EP 0951255A1 EP 98902053 A EP98902053 A EP 98902053A EP 98902053 A EP98902053 A EP 98902053A EP 0951255 A1 EP0951255 A1 EP 0951255A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylindrical elements
- successively
- elementary
- cylindrical
- connecting member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 210000004204 blood vessel Anatomy 0.000 claims abstract description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000003698 laser cutting Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 208000031481 Pathologic Constriction Diseases 0.000 abstract description 3
- 208000037804 stenosis Diseases 0.000 abstract description 2
- 230000036262 stenosis Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 238000002513 implantation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000012781 shape memory material Substances 0.000 description 2
- 206010002329 Aneurysm Diseases 0.000 description 1
- 208000037260 Atherosclerotic Plaque Diseases 0.000 description 1
- 238000002399 angioplasty Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 238000013130 cardiovascular surgery Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 210000003238 esophagus Anatomy 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- -1 phynox® Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 208000037803 restenosis Diseases 0.000 description 1
- 230000002966 stenotic effect Effects 0.000 description 1
- 210000003708 urethra Anatomy 0.000 description 1
- 230000002485 urinary effect Effects 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
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 sheet material 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 sheet material 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 sheet material 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 sheet material 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 sheet material 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 sheet material 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 sheet material 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 sheet material 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)
Abstract
The invention concerns an expandable tubular device consisting of an assembly of radially expandable cylindrical elements, aligned along a common longitudinal axis and connected two by two successively by a plurality of connecting members spaced at an angle and coplanar with said cylindrical elements. The invention is characterised in that these connecting members (3) are capable of being elongated along the longitudinal axis to compensate the reduction in length of the cylindrical elements (2) when they expand radially; each connecting member (3) forming an undulation consisting of at least three elementary U-shaped portions mutually connected two by two successively in the opposite direction, and the free ends of which (3a, 3b) are respectively connected to two adjacent cylindrical elements (2). The invention is applicable to corporeal ducts and in particular to blood vessels with stenosis.
Description
Dispos itif implantable pour le traitement d ' un conduit corporel Implantable device for the treatment of a bodily canal
La présente invention concerne généralement un dispositif tubulaire expansible, destiné à être implanté dans la lumière d'un conduit corporel présentant une affection. L'invention trouve principalement application dans le domaine du traitement des vaisseaux sanguins présentant des sténoses.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.
Elle peut être également utilisée dans le traitement des affections de divers conduits du corps humain ou animal, tels que par exemple les conduits urinaires et notamment l'urètre, ou bien encore digestifs et notamment l'oesophage. L'implantation percutanée à l'intérieur d'un vaisseau sanguin sténose d'un dispositif tubulaire expansible, communément désigné par le terme américain "stent", constitue une alternative de plus en plus utilisée à la chirurgie cardio- vasculaire classique.It can also be used in the treatment of affections of various conduits of the human or animal body, such as for example the urinary conduits and in particular the urethra, or even digestive and in particular the esophagus. Percutaneous implantation inside a stenotic blood vessel of an expandable tubular device, commonly known by the American term "stent", constitutes an increasingly used alternative to conventional cardiovascular surgery.
L'utilisation d'un "stent" est en particulier préconisée après une angioplastie conventionnelle au ballon pour empêcher le vaisseau dilaté de se refermer spontanément, ou pour prévenir son occlusion par la formation d'une nouvelle plaque athéromateuse et la constitution d'une éventuelle resténose.The use of 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.
On distingue généralement deux grandes catégories de "stent".There are generally two main categories of "stent".
Les "stent", dits auto-expansibles, aptes à passer d'eux-mêmes d'une première position resserrée sous contrainte permettant leur acheminement à travers le conduit corporel à une deuxième position expansée de travail.The "stent", called self-expanding, able to pass by themselves from a first constricted position under stress allowing their routing through the body duct to a second expanded working position.
Ces dispositifs ont généralement une conformation élastique. Ils peuvent également être fabriqués au moyen de matériaux à mémoire de forme.These devices generally have an elastic conformation. They can also be made from shape memory materials.
La seconde catégorie de "stent" est constituée des dispositifs dont l'expansion peut être forcée mécaniquement sous l'effet d'une force exercée depuis l'intérieur vers l'extérieur dans une direction radiale, le diamètre à l'état expansé étant fonction de la force exercée. Cette force peut être par exemple celle résultant du gonflement d'un ballonnet.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.
De tels dispositifs sont généralement réalisés au moyen de matériaux présentant une faible mémoire élastique et susceptibles de subir une déformation plastique irréversible.Such devices are generally produced using materials having a low elastic memory and liable to undergo irreversible plastic deformation.
Ce type de dispositifs est actuellement le plus couramment employé notamment en raison d'une facilité d'implantation plus grande par comparaison aux dispositifs auto-expansibles.
La présente invention n'est pas limitée à une de ces deux catégories de "stent", et couvre des dispositifs auto-expansibles ou non.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.
Le document EP 0.540.290 décrit un dispositif tubulaire expansible formant "stent" généralement constitué d'un corps sensiblement tubulaire défini par un ensemble d'éléments cylindriques radialement expansibles, alignés selon un axe longitudinal commun et reliés deux à deux successivement par une pluralité d'organes de liaisons angulairement espacés et coplanaires avec lesdits éléments cylindriques.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.
Chaque élément cylindrique de ce dispositif connu présente, à l'état expansé, une longueur inférieure à sa longueur initiale à l'état resserré.Each cylindrical element of this known device has, in the expanded state, a length less than its initial length in the constricted state.
Les organes de liaisons entre ces éléments cylindriques sont constitués de tronçons rectilignes rigides, de sorte que la longueur finale de ce dispositif connu, après expansion est inférieure à sa longueur initiale, ce qui peut poser des difficultés lors de l'implantation dans le conduit corporel. En outre, un tel dispositif connu manque généralement de souplesse longitudinale.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. . In addition, such a known device generally lacks longitudinal flexibility.
Dans ces conditions, la présente invention a pour but de résoudre le problème technique consistant en la fourniture d'un dispositif tubulaire expansible d'une nouvelle conception, qui présente une souplesse longitudinale élevée et une longueur après implantation sensiblement égale à la longueur initiale.Under these conditions, 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.
La solution, conforme à la présente invention, pour résoudre ce problème technique, consiste en un dispositif tubulaire expansible destiné à être implanté dans la lumière d'un conduit corporel tel que notamment un vaisseau sanguin, constitué d'un corps sensiblement tubulaire défini par un ensemble d'éléments cylindriques radialement expansibles, alignés selon un axe longitudinal commun et reliés deux à deux successivement par une pluralité d'organes de liaisons angulairement espacés et coplanaires avec lesdits éléments cylindriques, chaque élément cylindrique présentant, à l'état expansé, une longueur inférieure à sa longueur initiale à l'état resserré, caractérisé en ce que lesdits organes de liaisons sont aptes à être allongés selon l'axe longitudinal pour compenser la diminution de longueur desdits éléments cylindriques au cours de leur expansion radiale et en ce que chaque organe de liaison forme une ondulation constituée d'au moins trois portions élémentaires en forme de U reliés entre eux deux à deux successivement
en sens inverse, et dont les extrémités libres sont respectivement reliés à deux éléments cylindriques adjacents.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.
L'invention sera mieux comprise, et d'autres buts, caractéristiques et avantages de celle-ci apparaîtront plus clairement à la lecture de la description explicative qui va suivre, faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemples non limitatifs illustrant deux modes de réalisation actuellement préférés de l'invention, et dans lesquels :The invention will be better understood, and other objects, characteristics and advantages thereof will appear more clearly on reading the explanatory description which will follow, made with reference to the appended schematic drawings given solely by way of nonlimiting examples illustrating two currently preferred embodiments of the invention, and in which:
- la Fig. 1 est une vue en plan de la développée de la surface latérale d'un dispositif conforme à un premier mode de réalisation de l'invention correspondant à l'état resserré de ce dispositif ;- 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;
- la Fig. 1A est une vue agrandie du détail A de la figure 1 ;- Fig. 1A is an enlarged view of detail A in FIG. 1;
- la Fig. 2 est une vue semblable à la figure 1, du même dispositif correspondant à l'état expansé ;- Fig. 2 is a view similar to FIG. 1, of the same device corresponding to the expanded state;
- la Fig. 3 est une vue semblable à la figure 1 d'un dispositif conforme à un second mode de réalisation de l'invention, correspondant à l'état resserré; et- 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; and
- la Fig. 4 est une vue semblable à la figure 2 du dispositif conforme au second mode de réalisation de l'invention, correspondant à l'état expansé.- 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.
On a donc représenté aux figures 1 à 4 un dispositif tubulaire expansible, conforme à la présente invention qui, pour la clarté de la description, est montré sous une configuration plane correspondant à la développée de sa surface latérale.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.
Un dispositif tubulaire expansible, selon l'invention, est généralement constitué d'un corps, ou armature, sensiblement tubulaire allongé 1 défini par un ensemble d'éléments cylindriques radialement expansibles, alignés selon un axe longitudinal commun et reliés deux à deux successivement par une pluralité d'organes de liaison angulairement espacés et coplanaires avec lesdits éléments cylindriques.An expandable tubular device, according to the invention, 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.
Ce dispositif est expansible entre un état resserré (figures 1 et 3) permettant son acheminement intra-luminal à travers un conduit corporel tel que par exemple un vaisseau sanguin, et un état expansé (figures 2 et 4) dans lequel ledit dispositif vient au contact de la paroi interne dudit conduit corporel pour y exercer une force dans une direction radiale et vers l'extérieur permettant le traitement d'une affection comme par exemple une sténose.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.
Un tel dispositif peut être expansé automatiquement, par exemple en raison de sa conformation ou de la nature des matériaux de ses éléments constitutifs.
Ce dispositif peut aussi être expansé mécaniquement de façon forcée sous l'action d'une force exercée depuis l'intérieur vers l'extérieur dans une direction radiale, par exemple au moyen d'un ballon gonflable.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.
Dans les figures 1 à 4, des références numériques identiques seront utilisées pour désigner des éléments identiques dans leur conception, leur construction et leur fonctionnement.In Figures 1 to 4, identical reference numerals will be used to designate identical elements in their design, construction and operation.
Dans ces figures, chaque élément cylindrique est généralement désigné par le chiffre de référence 2, tandis que chaque élément de liaison est désigné par le chiffre de référence 3. D'une façon commune aux deux modes de réalisation de l'invention représentés aux figures, chaque organe de liaison 3 présente généralement la forme d'une ondulation constituée de trois portions élémentaires en forme de U reliés entre eux deux à deux successivement en sens inverse, et dont les deux extrémités libres 3a, 3b sont respectivement reliées, de préférence par une portion coudée 4a, 4b, à deux éléments cylindriques adjacents 2 de préférence en un point situé au niveau d'une extrémité longitudinale de ceux-ci comme cela sera expliqué plus en détail ci-après.In these figures, each cylindrical element is generally designated by the reference numeral 2, while each connecting element is designated by the reference numeral 3. In a manner common to the two embodiments of the invention shown in the figures, 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.
Bien entendu, les organes de liaison 3 qui sont normalement identiques peuvent être de formes variées. Ils se présenteront généralement sous forme d'une ondulation constituée d'au moins trois portions élémentaires en forme de U reliés entre eux deux à deux successivement en sens inverse, c'est-à-dire d'une ondulation comportant au moins trois boucles alternées.Of course, 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 .
Avantageusement, cette ondulation comportera un nombre impair de portions élémentaires en forme de U.Advantageously, this undulation will comprise an odd number of elementary U-shaped portions.
De par leur conformation particulière, les organes de liaison sont aptes à être allongés selon l'axe longitudinal pour compenser la diminution de longueur du dispositif résultant de la diminution de longueur des éléments cylindriques sous l'effet de leur expansion radiale, tout en permettant une souplesse en flexion. Plus précisément, les portions élémentaires 5a, 5b en forme de U disposées aux deux extrémités de l'organe de liaison 3 permettent, par suite du pivotement vers l'extérieur de leur branche la plu externe, l'allongement de l'organe de liaison 3 d'une longueur sensiblement égaie à la diminution de longueur d'un élément cylindrique 2 après expansion (Fig. 1A).
La (ou les) portion(s) élémentaire(s) 6 en forme de U disposée(s) entre les portions élémentaires extrêmes précitées confère(nt) au dispositif une très grande souplesse en flexion.By their particular conformation, 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. More precisely, 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.
Cette souplesse en flexion est particulièrement avantageuse lors de l'acheminement du dispositif à l'intérieur du système vasculaire puisqu'elle permet de négocier au mieux les courbures et les coudes existants.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.
Selon une caractéristique particulière de l'invention, les portions coudées 4a, 4b raccordant les extrémités des organes de liaison 3 aux éléments cylindriques adjacents 2 sont conformées et réalisées pour présenter une rigidité supérieure à celle des oortions élémentaires extrêmes 5a, 5b.According to a particular characteristic of the invention, 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.
O' .is façon générale, la paroi latérale de chaque élément cylindrique 2 constituant un dispositif conforme à la présente invention, est constituée par un réseau radialement expansible, et chaque élément cylindrique présente à l'état expansé une longueur inférieure à sa longueur à l'état resserré. Dans l'exemple représenté aux figures 1 et 2, ce réseau est constitué, à l'état resserré, d'une ondulation formée de portions élémentaires en forme de U disposés deux à deux successivement en sens inverse.O '.is generally, the side wall of 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. In the example shown in Figures 1 and 2, this network consists, in the constricted state, of a corrugation formed of elementary U-shaped portions arranged two by two successively in opposite directions.
Comme on le comprend, les branches de chaque portion élémentaire en forme de U sont articulées à une extrémité, et sont susceptibles d'être écartées l'une par rapport à l'autre au cours de l'expansion de l'élément cylindrique 2 ; chaque portion élémentaire présentant, après expansion, une forme générale en V comme représenté à la figure 2.As can be understood, the branches of 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.
De même, on comprend que la longueur L2 de l'élément cylindrique 2 à l'état expansé est inférieure à la longueur Ll du même élément à l'état resserré. Avantageusement, les éléments cylindriques 2 sont disposés deux à deux successivement de façon symétrique par rapport à un plan P perpendiculaire à leur plan commun disposé à égale distance des extrémités 2a, 2b adjacentes de ces deux éléments cylindriques.Similarly, it is understood that 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. Advantageously, 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.
Dans le mode de réalisation représenté aux figures 3 et 4, le réseau constituant la surface latérale de chaque élément cylindrique 2 est formé, dans son état resserré, par un ensemble d'anneaux écrasés reliés deux à deux successivement en un point médian.In the embodiment shown in Figures 3 and 4, the network constituting the lateral surface of each cylindrical element 2 is formed, in its constricted state, by a set of crushed rings connected two by two successively at a midpoint.
Comme on le comprend, et comme on peut le voir sur la figure 4, ces anneaux écrasés se déploient lors de l'expansion radiale desdits éléments
cylindriques 2 pour former une succession de losanges reliés deux à deux successivement au niveau de deux sommets opposés.As can be understood, and as can be seen in FIG. 4, 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.
Comme en ce qui concerne le mode de réalisation représenté aux figures 1 et 2, la longueur L2 de chaque élément cylindrique 2, à l'état expansé, est inférieure à la longueur Ll de ce même élément, à l'état resserré.As with the embodiment shown in FIGS. 1 and 2, 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.
Avantageusement, les éléments cylindriques 2 conformément à ce deuxième mode de réalisation de l'invention, sont disposés deux à deux successivement de façon symétrique relativement à un plan P perpendiculaire à leur plan commun et disposé à égale distance des extrémités 2a, 2b adjacentes de ces deux éléments. Comme le montrent les figures, les organes de liaison 3 sont reliés par l'intermédiaire des portions coudées 4a, 4b aux éléments cylindriques 2 en un point situé au niveau d'une extrémité longitudinale de ces éléments cylindriques, c'est- à-dire dans les deux modes de réalisation représentés aux figures, au niveau des articulations permettant le déploiement et l'expansion des éléments cylindriques 2. Les organes de liaison seront normalement disposés de façon à être angulairement espacés, de préférence de façon régulière, et coplanaires avec les éléments cylindriques 2. Le nombre d'organe de liaison entre deux éléments cylindriques dépendra bien entendu du diamètre du dispositif et donc de l'application envisagée. Il sera alors en général de 3 comme dans les exemples représentés.Advantageously, 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. As shown in the figures, 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.
D'une façon générale, un dispositif tubulaire expansible conforme à la présente invention peut être réalisé en une matière quelconque compatible avec le conduit corporel et les fluides corporels avec lesquels ce dispositif est susceptible d'entrer en contact. De telles matières peuvent être des matières à mémoire de forme telles que par exemple acier inox, phynox®, nitinol pour la constitution d'un dispositif autoexpansible, ou des matières déformables, à faible mémoire élastique, comme par exemple des matières métalliques, et en particulier l'acier inoxydable, le tungstène, le platine, le tantale ou l'or. De préférence, un dispositif selon l'invention est obtenu de façon connue en soi à partir d'un tube creux à paroi mince présentant une épaisseur de paroi uniforme, soit par découpe au laser suivie d'un polissage électrochimique, soit par traitement chimique ou électrochimique.
Les dispositifs représentés aux figures 1 à 4 ont par exemple été obtenus par découpe au laser d'un tube en acier inoxydable ayant un diamètre extérieur de 1,3 mm et une épaisseur de paroi de 0,1 mm suivi d'un polissage électrochimique.In general, 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. Preferably, 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.
Le dispositif qui vient d'être décrit peut être mis en place de façon connue en soi, et on pourra à cet égard se reporter aux documents de l'état de la technique et notamment au brevet US 4.886.062.The device which has just been described can be implemented in a manner known per se, and reference may be made in this regard to the documents of the state of the art and in particular to US Pat.
Dans le cas d'un dispositif à expansion forcée mécaniquement, le système de mise en place comportera de préférence un cathéter gonflable destiné à être reçu à l'intérieur du dispositif à l'état serré, et à exercer sur ce dispositif une force dans une direction radiale de l'intérieur vers l'extérieur sous l'effet du gonflement du ballon.In the case of a mechanically forced expansion device, 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.
Le dispositif conforme à l'invention peut en outre être appliqué ou utilisé pour la fixation d'implants, en particulier de couvertures en polymères poreux tissés, non tissés, expansés ou de membranes élastiques pour l'isolement d'anévrisme.
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.
Claims
1. Dispositif tubulaire expansible destiné à être implanté dans la lumière d'un conduit corporel tel que notamment un vaisseau sanguin, constitué d'un corps sensiblement tubulaire défini par un ensemble d'éléments cylindriques radialement expansibles, alignés selon un axe longitudinal commun et reliés deux à deux successivement par une pluralité d'organes de liaisons angulairement espacés et coplanaires avec lesdits éléments cylindriques, chaque élément cylindrique présentant, à l'état expansé, une longueur inférieure à sa longueur initiale à l'état resserré, caractérisé en ce que lesdits organes de liaisons (3) sont aptes à être allongés selon l'axe longitudinal pour compenser la diminution de longueur desdits éléments cylindriques (2) au cours de leur expansion radiale et en ce que chaque organe de liaison (3) forme une ondulation constituée d'au moins trois portions élémentaires en forme de U reliés entre eux deux à deux successivement en sens inverse, et dont les extrémités libres (3a, 3b) sont respectivement reliés à deux éléments cylindriques adjacents (2).1. 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 connected two by two successively 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 constricted state, characterized in that said connecting members (3) are able to be elongated along the longitudinal axis to compensate for the decrease in length of said cylindrical elements (2) during their radial expansion and in that each connecting member (3) forms a corrugation consisting of '' at least three elementary U-shaped portions interconnected two by two successively in direction reverse, and whose free ends (3a, 3b) are respectively connected to two adjacent cylindrical elements (2).
2. Dispositif selon la revendication 1, caractérisé en ce que chaque extrémité libre (3a, 3b) d'un organe de liaison (3) est relié à un élément cylindrique (2) par l'intermédiaire d'une portion coudée (4a, 4b) de préférence en un point situé au niveau d'une extrémité longitudinale dudit élément cylindrique. 2. Device according to claim 1, characterized in that each free end (3a, 3b) of a connecting member (3) is connected to a cylindrical element (2) via a bent portion (4a, 4b) preferably at a point located at a longitudinal end of said cylindrical element.
3. Dispositif selon la revendication 2, caractérisé en ce que la portion coudée (4a, 4b) précitée présente une rigidité supérieure à celle des portions élémentaires en forme de U de l'organe de liaison (3) portant les extrémités libres (3a, 3b).3. Device according to claim 2, characterized in that the above-mentioned angled portion (4a, 4b) has a rigidity greater than that of the elementary U-shaped portions of the connecting member (3) carrying the free ends (3a, 3b).
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que chaque organe de liaison (3) précité comporte un nombre impair, et de préférence trois portions élémentaires en forme de U.4. Device according to one of claims 1 to 3, characterized in that each above-mentioned connecting member (3) has an odd number, and preferably three elementary U-shaped portions.
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que chaque élément cylindrique (2) précité est constitué, à l'état resserré, d'une ondulation formée de portions élémentaires en formedc U disposés deux à deux successivement en sens inverse. 5. Device according to one of claims 1 to 4, characterized in that each aforementioned cylindrical element (2) consists, in the constricted state, of a corrugation formed of elementary portions in formc U arranged two by two successively in reverse.
6. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que chaque élément cylindrique (2) précité est constitué, à l'état resserré, par un ensemble d'anneaux écrasés reliés deux à deux successivement en un point médian.
6. Device according to one of claims 1 to 4, characterized in that each aforementioned cylindrical element (2) is constituted, in the constricted state, by a set of crushed rings connected two by two successively at a midpoint.
7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce qu'il est fabriqué à partir d'un tube creux à paroi mince d'épaisseur uniforme, soit par découpe au laser suivie d'un polissage électrochimique, soit par traitement chimique ou électrochimique.7. Device according to one of claims 1 to 6, characterized in that it is manufactured from a hollow tube with thin wall of uniform thickness, either by laser cutting followed by electrochemical polishing, or by chemical or electrochemical treatment.
8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce qu'il est réalisé en une matière métallique choisie de préférence parmi l'acier inoxydable, le tungstène, le platine, le tantale, l'or et le nitinol.
8. Device according to one of claims 1 to 7, characterized in that it is made of a metallic material preferably chosen from stainless steel, tungsten, platinum, tantalum, gold and nitinol.
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FR9700177A FR2758253B1 (en) | 1997-01-10 | 1997-01-10 | IMPLANTABLE DEVICE FOR THE TREATMENT OF A BODY DUCT |
FR9700177 | 1997-01-10 | ||
PCT/FR1998/000037 WO1998030172A1 (en) | 1997-01-10 | 1998-01-09 | Device capable of being implanted for treating a corporeal duct |
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Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5449373A (en) * | 1994-03-17 | 1995-09-12 | Medinol Ltd. | Articulated stent |
-
1997
- 1997-01-10 FR FR9700177A patent/FR2758253B1/en not_active Expired - Fee Related
-
1998
- 1998-01-09 EP EP98902053A patent/EP0951255A1/en not_active Withdrawn
- 1998-01-09 WO PCT/FR1998/000037 patent/WO1998030172A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
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See references of WO9830172A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2758253B1 (en) | 1999-04-02 |
WO1998030172A1 (en) | 1998-07-16 |
FR2758253A1 (en) | 1998-07-17 |
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