EP1903981A1 - Temporärer stent - Google Patents
Temporärer stentInfo
- Publication number
- EP1903981A1 EP1903981A1 EP06762552A EP06762552A EP1903981A1 EP 1903981 A1 EP1903981 A1 EP 1903981A1 EP 06762552 A EP06762552 A EP 06762552A EP 06762552 A EP06762552 A EP 06762552A EP 1903981 A1 EP1903981 A1 EP 1903981A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stent
- stent according
- ring segments
- zones
- spine
- 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- Withdrawn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
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
- 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
-
- 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
- A61F2/844—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents folded prior to deployment
-
- 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
- A61F2002/825—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents having longitudinal struts
-
- 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
-
- 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
- A61F2002/91575—Adjacent bands being connected to each other connected peak to trough
-
- 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
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2002/9528—Instruments specially adapted for placement or removal of stents or stent-grafts for retrieval of stents
-
- 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
- the invention relates to a temporary stent having a multiplicity of ring segments arranged over the length of the stent, which can be explanted again after implantation in a body lumen.
- the stent is a stent suitable for vascular, such as coronary or peripheral blood vessels, but can also be used for other body lumina, given a corresponding dimensional layout.
- Intraluminal stents which have a reduced diameter for transport to the site of implantation and are expanded to the desired final diameter upon implantation, are known in a variety of embodiments. Such stents are usually intended for permanent implantation, i. H. they are intended to remain in the body at the site of implantation.
- the implanted stent loses its function after a certain period of time; it has served its purpose, such as widening a vessel, stabilizing a malfunction or closing a fistula or branch, and is no longer needed.
- the best stent is still the non-existing stent. It would therefore be desirable to have a stent that can be readily removed upon completion of its function, especially without loading on the patient.
- Such a stent should have the usual stent properties and functions, i. H. be suitable to support, expand and stabilize a body lumen. After completion of this function, it should be able to be removed without residue with minimal effort.
- a temporary stent of the initially mentioned type in which all the ring segments emanate from a spine extending over the length of the stent and have at least two weakened zones which allow the ring segments to be folded during the explantation of the stent, and the spine has a mountain element at its proximal end.
- the temporary stent according to the invention is intended to be implanted in the usual way in the body lumen. However, its construction and its segments are designed in such a way that, after functional fulfillment, this stent can easily be explanted again on the way in which it entered the body.
- the temporary stent according to the invention is in particular a vascular stent, suitable for implantation in the coronary or peripheral vascular area. But it is, with appropriate dimensioning, also suitable as a stent for other body lumina, such as in urology for the urinary tract, for the airways in the trachea and bronchial tubes, for the intestinal area, especially the duodenum, for the esophagus and for the bile duct. Independent of These additional suitability is described below with reference to a stent in the vascular area of the temporary stent according to the invention.
- Vascular stents are typically cut from a tubular precursor material and reduced to a diameter for implantation that allows for delivery through a guiding catheter.
- the stents can be crimped onto a balloon, which then expands them hydraulically at the implantation site to the desired diameter.
- stents made of shape memory alloys are used, which occupy a volume-reduced form under the external constraint of a catheter, but widen to their target diameter after removal from the catheter and elimination of external constraint.
- a temperature-induced martensitic transition is also possible or mixed forms of both. The skilled person is familiar with these possibilities.
- proximal in relation to the stent refers to the catheter side or the attending physician. "Distally”, after the implantation, is to be understood as being remote from the catheter end.
- Explantation of a stent is understood to mean the retrieval of a stent that was fully implanted and no longer needed, as well as the retrieval of a stent that was misplaced or damaged during implantation. In the first place, however, it is stents that are no longer needed after their function has been performed or must be replaced.
- Essential for the temporary stents according to the invention is, on the one hand, the arrangement of weakened zones in the ring segments and, on the other hand, the recovery element at the proximal end.
- the mountain element and the weakening zones are coordinated with one another such that, when the stent is recovered, the ring segments fold in at the weakened zones or fold together, thus allowing the stent to be withdrawn into a catheter.
- the catheter may be a conventional guide catheter, but may be a special one formed retrieval catheter having at its distal end a zone of greater strength or rigidity, which facilitates the withdrawal and folding of the stent.
- the temporary stent according to the invention can be applied in the usual way, d. H. crimped on a balloon, guided to the site and placed there and hydraulically expanded over the balloon.
- a balloon guided to the site and placed there and hydraulically expanded over the balloon.
- shape memory alloy for example Nitinol possible.
- the stent can be steered under the external constraint of a catheter to the site and released there; after release, the stent expands into its previously impressed shape.
- the temporary stents according to the invention are preferably designed such that they are present in the target vessel in a fully expanded state.
- the ring segments form in the fully expanded state a more or less regular ring or circle, which ensures high stability even with only small material thicknesses and web widths of the stent.
- fully circular ring segments and the weakening zones do not come with radial load to bear.
- Circular ring segments also allow easy and safe implantation and bring, in addition to a sufficient radial force, a sufficient flexibility with respect to the adaptation to the course of the respective vessel with it.
- stent In addition to the least possible injury to a vessel during implantation, a necessary prerequisite is also safe explantation.
- the stent must therefore not grow in relevant and must continue to be defined collapsible. To prevent ingrowth, it may therefore be useful to coat the stent, especially with the cell growth inhibiting substances.
- Such stents and coatings are known per se to the person skilled in the art. Reference is made, for example, to plastic coatings containing a proportion of an antiproliferative agent, for example rapamycin or taxol.
- the stent is regularly pressed into the vessel wall during implantation. This indentation in the vessel wall also serves to fix the stent at its implantation site and to avoid later flushing.
- the "depth of impression" is about half the thickness of the material, but pushing in the stent may cause a mechanical injury to the vessel wall.
- the stent according to the invention may be coated on its outer wall with a material dissolving under the conditions prevailing at the implantation site.
- a material dissolving under the conditions prevailing at the implantation site Such materials are known and may consist of plastic, but also of metal. If the outer coating of the stent to a considerable extent or completely dissolved, the stent is much easier to remove again and the risk of injury to the vessel wall is significantly reduced.
- the outer coating of the stent expediently accounts for 25 to 75% of the total wall thickness of the stent, in particular about 40 to 60%.
- the wall thickness of vascular stents is generally in the range of 40 to 70 microns, in the case of a coating at 50 to 100 microns.
- the stents according to the invention are, in order to minimize injury to the vessel wall and largely excluded, specially coated for explantation only in the outer region with the resorbable material.
- a coating of the inner wall with a conventional active substance-containing material may additionally be present.
- the coating of the inner wall and the outer wall in principle differ in their function and purpose.
- the coating may for example be made of a biodegradable polymer, as already used for stent coatings for the release of active ingredients.
- Further absorbable materials are, in particular, also metals which decompose in the circulation, for example magnesium and pure iron.
- Self-dissolving stents made of these materials are described, for example, in WO 99/003515 A2.
- Such a coating of the outer wall of stents is usually carried out after completion - electropolishing and cleaning - and Vorkrimpung. After pre-crimping, the segments are very close to each other.
- the stent received on a support can then be sprayed from the outside with the coating, whereby an ideal distribution of the coating on the outer surface is achieved with a smooth transition to the side surface of the segments. This is especially true for coatings of a plastic material.
- mountain wire connected to the stent, it should also be coated at least in its distal region, in which case the coating can be made on one side or on all sides.
- tubes of the different materials can be connected before cutting the stent (sandwich technique).
- it can be coated by sputtering or rolling, especially in magnesium, the plasma coating and the ultrasonic coating in question.
- an outer coating with a rapidly corroding metal in particular the production of the stent from a sandwich tube or tube is preferred.
- the spine is extremely flexible and can adapt optimally to the course of a vessel.
- the outgoing therefrom ring segments align accordingly across the course of the vessel, which is important for the expansion and support.
- the expansion of the stent with substantially fully circularly expanded ring segments results in a good support of the vessel wall and a defined widening of the vessel lumen.
- the temporary stents according to the invention have at least two weakened zones, which are preferably in the immediate vicinity on both sides are arranged to the spine.
- the stent has at least three weakening zones, two immediately adjacent to both sides of the spine and the third on the opposite side of the spine of the ring segment.
- a stent has proven to be particularly useful, having three zones of weakness with two zones of weakness adjacent to both sides of the spine and a third offset by 180 ° to the spine in each ring segment.
- the stents according to the invention have a length which is customary in the respective field of use and usually has 5 to 25 ring segments.
- the number of segments can be larger or smaller, depending on the web width and the required distance.
- the segment distance is in the coronary region, generally in the range of 0.5 to 3 mm.
- the weakened zones themselves can be zones of lesser material thickness.
- the web width of the ring segments can be reduced in the weakened zones.
- the weakening is associated with a material reduction, wherein the material reduction can be up to 50%, preferably about 20 to 40%.
- the inventively provided recovery device for the stent is provided proximal to the backbone.
- it can be designed as an element for fixing a retriever, for example as an eyelet, hook or loop.
- a retriever can hook into this element, pulling the stent back into a retrieval catheter.
- the mountain element can also be a mountain wire, which is attached directly to the spine or hooked into an eyelet and remains on the stent.
- This variant is particularly advantageous for vascular stents of small diameter, as well as in applications where it depends only on a short-term stent deployment.
- Such a mountain wire can be very thin, for example, with a maximum diameter of 0.3 mm and remains until recovery of the stent in the vessel.
- the guide catheter and the "large" sluices can be removed as a rule.
- a Braunüle is generally sufficient.
- the rescue catheter can also be very filigree, depending on the size of the stent, with an outer diameter of less than 1 mm, and is usually introduced through a standard lock.
- the variant in which the stent has only one midge element into which a retriever can hook is preferred.
- the stents according to the invention can be equipped with any necessary radiopaque markers.
- a preferred location for the attachment of a marker is in the vicinity of the mountain element or the equipment of the mountain element with marker properties.
- the stents according to the invention are produced from conventional materials, in particular iron (pure iron), stainless steel (medical grade stainless steel), gold, Platinum, shape memory alloys (nitinol) and tantalum. Stents made of suitable plastic materials can also be used.
- the stents are cut in the usual way from a tubular starting material, in particular laser techniques are used.
- the starting material generally has a wall thickness of 70 to 300 ⁇ m, coronary stents after electropolishing of 40 to 70 ⁇ m.
- the fact that the stents are usually expanded to full circle, is given only by the shape of a high radial strength, so that very small wall thicknesses of 50 microns and less come into question.
- the ridge width of both the ring segments and the spine is in the range of 40 to 500 microns, in coronary stents in the range of 40 to 80 microns. Due to the great radial strength of a ring segment which is fully expanded to the circle, the web width can be smaller than usual in the case of vessel stents.
- the material thicknesses and web widths are based on the dimensions and strengths customary in the respective field of use.
- Figure 1 is a temporary according to the invention
- FIG. 2 shows a stent according to the invention
- FIG. 3 is a detail of the stent of FIG.
- FIG. 1 shows a temporary stent 1 according to the invention with its spine 2 and the individual ring segments 3 a, 3 b, 3 c 3 m in a fully expanded state, in which the ring segments are expanded to a full circle.
- the ring segments 3a ... 3m are arranged at regular intervals over the length of the stent and are connected to each other via the common spine 2. In general, the ring segments 3a ... 3m are perpendicular to the spine 2.
- the web width of ring segments 3 and 2 of backbone is about 50 microns, the material thickness is also in the range of 50 microns.
- Each of the ring segments 3 has three weakening zones, two of which (4, 5) are located immediately adjacent to the spine.
- a third weakening zone 6 is offset by 180 ° from the backbone 2, so located, relative to the ring segment, the spine 2 opposite. These weakening zones are applied to each of the ring segments 3.
- the weakening zones 4, 5, 6 are zones of a reduced web width.
- the spine 2 with a proximal end 7 and a distal end 9 has at its proximal end 7 a mountain element 8 to which the mountain wire 10 is coupled.
- the mountain wire 10 is firmly connected to the mountain element 8.
- the mountain element 8 may be an eyelet into which a separate retriever engages.
- the mountain wire 10 may for example also be fixed directly to the spine 2 by means of a spot weld.
- Figure 2 shows a temporary stent according to the invention, drawn in unwound form, in the production state.
- the ring segments 3a... 3i are wave-shaped in this state and have the weakened zones 4, 5, 6, as shown in FIG.
- On both sides of the spine 2 are immediately adjacent zones of lesser Bridge width 4, 5, in which the web width is reduced by about 40%.
- Offset by 180 ° against the spine 2 is the third weakening zone 6, also with a 40% reduced web width.
- the mountain element 8 is shown, which connects the mountain wire 10 with the spine 2.
- the stent shown in Figure 2 is cut in this form from the tube blank and crimped for implantation on a conventional implantation balloon.
- the wave-shaped ring segments 3a ... 3i are pushed further into one another, so that the "wavelength” decreases and the "amplitude” increases.
- the wave-shaped course of the ring segments 3a, ..., 3i is then stretched, d. H. the ring segments 3 have a substantially circular course, as shown in Figure 1.
- FIG. 3 shows a detail of the illustration of FIG. 2 with the spine 2, the ring segment 3 a and the weakened zones 4, 5 on both sides of the spine 2.
- the weakening zones can be achieved not only by a material reduction, but also by a material weakening.
- a significant effect is that in the case of a proximally applied tensile force, possibly under the action of a Bergekathetermündung, fold the ring segments 3 at the points of weakness and allow the withdrawal of the entire stent in the recovery catheter.
- the recovery catheter can thus have a significantly smaller diameter than the implanted stent.
- Figure 4 shows the structure and operation of a stent according to the invention with an outer coating.
- a ring segment 3 of a stent 1 in cross section, wherein the segment 3 on its inner side 31 consists of a durable material, such as stainless steel, Nitinol or cobalt / chromium alloy and on its outer side 32 a coating a resorbable or corrodible material, for example pure iron or magnesium.
- the ring segment 3 of the stent 1 is shown in its expanded form at the implantation site, with about 50% of its thickness being pressed into a vessel wall A.
- the inside 31 of the ring segment 3 protrudes into the bloodstream B.
- FIG. 4b shows a stent 1 provided with a polymer coating in the cross section of a ring segment 3.
- the actual stent body 31 - corresponding to the inside - consists of a conventional stent material, such as stainless steel.
- the stent On the outside, the stent has a coating 32 of a resorbable polymer that covers the outside and thins out towards the flanks. This variant also projects into the vessel wall A with about half of its thickness, with the inside 31 of the ring segment 3 protruding into the bloodstream B.
- the function is such that the material on the outside 32, be it a metal subject to corrosion or a resorbable
- Polymer coating is decomposed under the influence of the blood and the immune system more or less rapidly and thus reduced or dissolved after days or weeks of support in the vessel wall A. Is this
- the stent can be explanted from the vessel without the risk of damage to the
- Vascular wall exists.
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- 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)
- Media Introduction/Drainage Providing Device (AREA)
- Prostheses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005033536 | 2005-07-14 | ||
DE200610017873 DE102006017873A1 (de) | 2005-07-14 | 2006-04-13 | Temporärer Stent |
PCT/EP2006/006815 WO2007006562A1 (de) | 2005-07-14 | 2006-07-12 | Temporärer stent |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1903981A1 true EP1903981A1 (de) | 2008-04-02 |
Family
ID=37188960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06762552A Withdrawn EP1903981A1 (de) | 2005-07-14 | 2006-07-12 | Temporärer stent |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090171439A1 (de) |
EP (1) | EP1903981A1 (de) |
CN (1) | CN101247777B (de) |
DE (1) | DE102006017873A1 (de) |
WO (1) | WO2007006562A1 (de) |
Families Citing this family (93)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8597716B2 (en) * | 2009-06-23 | 2013-12-03 | Abbott Cardiovascular Systems Inc. | Methods to increase fracture resistance of a drug-eluting medical device |
WO2006097931A2 (en) | 2005-03-17 | 2006-09-21 | Valtech Cardio, Ltd. | Mitral valve treatment techniques |
US8951285B2 (en) | 2005-07-05 | 2015-02-10 | Mitralign, Inc. | Tissue anchor, anchoring system and methods of using the same |
EP2088965B1 (de) | 2006-12-05 | 2012-11-28 | Valtech Cardio, Ltd. | Platzierung eines segmentierten Rings |
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- 2006-07-12 WO PCT/EP2006/006815 patent/WO2007006562A1/de active Application Filing
- 2006-07-12 US US11/995,434 patent/US20090171439A1/en not_active Abandoned
- 2006-07-12 EP EP06762552A patent/EP1903981A1/de not_active Withdrawn
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CN101247777A (zh) | 2008-08-20 |
CN101247777B (zh) | 2013-06-19 |
WO2007006562A1 (de) | 2007-01-18 |
DE102006017873A1 (de) | 2007-01-25 |
US20090171439A1 (en) | 2009-07-02 |
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