US20080243230A1 - Stent having radially expandable main body - Google Patents
Stent having radially expandable main body Download PDFInfo
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- US20080243230A1 US20080243230A1 US12/057,806 US5780608A US2008243230A1 US 20080243230 A1 US20080243230 A1 US 20080243230A1 US 5780608 A US5780608 A US 5780608A US 2008243230 A1 US2008243230 A1 US 2008243230A1
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- 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
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- 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
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/958—Inflatable balloons for placing stents or stent-grafts
-
- 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
- A61F2/82—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
- A61F2002/91591—Locking connectors, e.g. using male-female connections
-
- 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
- A61F2002/9505—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
-
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0071—Additional features; Implant or prostheses properties not otherwise provided for breakable or frangible
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- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
- A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers
Abstract
A stent made of a material having a low strength and having a main body circumscribing a cylindrical shape and radially expandable from a contracted starting position into a dilated support position, comprising a) a plurality of support segments disposed around the circumference and arrayed on one another in the axial direction each segment being formed by a strut meandering in its coarse structure in its contracted starting position and having alternately opposing meandering curves expandable into the support position made of flexible material; b) a plurality of axial connectors connecting between zenith points of at least a part of the meandering curves in the axial-parallel direction of the support segments; and c) at least one means for stabilizing the strut coarse structure in its contracted starting position against radial expansion and being automatically detachable upon a radial expansion of the stent.
Description
- This patent application claims priority to German Patent Application No. 10 2007 015 670.9, filed Mar. 31, 2007, the disclosure of which is incorporated herein by reference in its entirety.
- The present disclosure relates to expandable vascular stents.
- One example of a vascular implant is described in detail in International Patent Publication No. WO 2004/103 215 A1, in particular, in regard to the fundamental areas of application of such stents and the special problems upon use of materials having a low ductile yield and also lower strengths, such as magnesium alloys.
- In the embodiment which may be inferred from this publication, the stent is implemented by a main body circumscribed by a cylindrical shape and radially expandable from a contracted starting position into a dilated support position which, on one hand, comprises multiple support segments running around the circumference and arrayed in the axial direction on one another. The support segments are each formed by a strut which is meandering in coarse structure in its contracted starting position having alternating opposing meandering curves made of flexible material. On the other hand, the main body has axial connectors running in the axial-parallel direction which connect the support segments between zenith points of at least a part of the meandering curves.
- The above-mentioned magnesium alloys as the material for producing stents have significantly lower strength values than typical construction materials for balloon-expandable stents, such as medical steel having the material identifications 316L, MP35N or L 605. These lower strength values cause problems in the practical application of the stents. It is thus necessary for the stent placement to mount the stent on a balloon catheter. For this purpose, the stent, which is structured from a sleeve material by laser cutting, for example, is crimped onto the balloon catheter in its contracted starting position. The stent is also guided on the catheter system through curved areas of the insertion or blood vessel system in this state during the implantation. Individual struts of the stent may open in the corresponding passages, by which the retention forces of the stent on the catheter are reduced. This causes a significant risk of loss of the stent.
- Especially endangered areas of the stent are the terminal strut elements having their meandering curves. In addition, the danger arises due to projecting edge segments, the so-called “flaring,” that, in addition to the mechanical irritation of the internal vascular wall upon passage of the stenosis or the retraction into the insertion catheter, unintended stripping of the stent from the balloon catheter will occur.
- The present disclosure describes several exemplary embodiments of the present invention.
- One aspect of the present disclosure provides a stent made of a material having a low strength and having a main body circumscribing a cylindrical shape and radially expandable from a contracted starting position into a dilated support position, comprising a) a plurality of support segments disposed around the circumference and arrayed on one another in the axial direction, each segment being formed by a strut meandering in its coarse structure in its contracted starting position and having alternately opposing meandering curves expandable into the support position made of flexible material; and b) a plurality of axial connectors connecting between zenith points of at least a part of the meandering curves in the axial-parallel direction of the support segments; and c) at least one means for stabilizing the strut coarse structure in its contracted starting position against radial expansion and being automatically detachable upon a radial expansion of the stent.
- One feature of the present disclosure provides a stent of the type according to the species in such a manner that unintended expansion of the entire stent or exposed areas thereof, such as the terminal front edges, is reliably prevented during the implantation.
- This feature is achieved according to the present disclosure by a means for stabilizing the strut coarse structure in its contracted starting position against radial expansion which are integrated in the stent design. These stabilization means are then detachable automatically upon the actual radial expansion of the stent.
- These stabilization means advantageously secure radial locking of the stent in its crimped state so that unintended expansion of the stent, even in partial areas, is avoided because of this fixing.
- According to preferred embodiments of the present disclosure, these stabilization means may be implemented in different ways, for example, by detachable glued joints between adjacent meandering curves of a strut or from strut to strut, by catch elements in the stent structure, boundary fixing traverses or by fine structure struts against the cited “flaring.” More detailed explanations may be inferred from the following description, in which exemplary embodiments of the subject matter of the present disclosure are explained in greater detail on the basis of the attached drawings.
- Various aspects of the present disclosure are described hereinbelow with reference to the accompanying figures.
-
FIG. 1 is a perspective view of one exemplary embodiment of a stent in its contracted starting position having a terminal glued joint as the stabilization means; -
FIG. 2 is a detail top view of the stent in an unwound view having a glued joint variant; -
FIG. 3 is a detail top view of the stent in an unwound view having a different glued joint variant; -
FIG. 4 is a schematic detail excerpt in an unwound illustration of the stent having catches as the stabilization means; -
FIG. 5 is a schematic detail excerpt in an unwound view of a stent having a boundary fixing traverse; -
FIG. 6 is a schematic detail excerpt in an unwound view of an exemplary embodiment of a stent having a different boundary fixing traverse; -
FIG. 7 is a schematic detail view in an unwound view of an exemplary embodiment of a stent having boundary fine structure struts as the stabilization means; -
FIG. 8 is an enlarged detail excerpt as shown inFIG. 7 ; -
FIG. 9 is a perspective partial illustration of an exemplary embodiment of a stent having extension struts for removable fastening to a balloon catheter; -
FIG. 10 is a top view of the stent as shown inFIG. 9 in an unwound view; -
FIG. 11 is a detail top view of an exemplary embodiment of a stent in an unwound view having marker projections coupled to one another; and -
FIG. 12 is a detail top view of an exemplary embodiment of a stent in an online view having marker projections coupled in a ring. -
FIG. 1 clarifies the structure of the stent in its contracted starting position. The stent is worked out of a cylindrical metal body by laser cutting in such a manner that the stent hasmultiple support segments 1 running around the circumference U and arrayed in the axial direction A on one another, which are each formed by one of thestruts 2 meandering in their coarse structure in the contracted starting position shown. - In the direction parallel to the axial direction A, the
support segments 1 are connected to one another byaxial connectors 4, which each run between thezenith points 5 ofmeandering curves 3 to be connected. Theaxial connectors 4 always run from the exterior side of ameandering curve 3 to the interior side of themeandering curve 3 of the adjacent strut due to the offset of theadjacent support segments 1 around the circumference U. - As is not shown in greater detail in the drawings, upon radial expansion of the stent, the sections of the
meandering curves 3 running between thezenith points 5 are deployed around the circumference U. The closer the corresponding sections approach to the circumference U, the greater the so-called collapsing pressure of the stent. - To achieve the additional radial fixing of the stent desired according to the present disclosure, in the variants shown in
FIGS. 1-3 , a gluedjoint 6 is provided which may be applied between the twoterminal meandering curves 3 on diametrically opposite radial positions in the form of a grouting point, for example. This gluedjoint 6 is shown schematically inFIG. 2 . With this type of gluedjoint 6, the adhesive faces are loaded by tension. - In another exemplary embodiment, it is also possible to attach the glued
joint 6 in such a manner that the adhesive faces are loaded by shear, as indicated inFIG. 3 . - The individual points of the glued
joint 6 may not only be situated terminally, as shown inFIGS. 1-3 , but also distributed on the circumference over the length of thestent 1. With such multiple positioning, upon radial expansion of the stent, the fixing is detached automatically in chronological sequence in accordance with the retention force. Experiments have shown that in spite of asymmetrical detachment of the individual fixed points, the stent may be open homogeneously if the fixing force is only large enough that theaxial connectors 4 are still capable of absorbing it. If gluedjoints 6′ are positioned in the area of theparticular strut 2 second from the outside, for example, theaxial connectors 4 may also act on the gluedjoint 6′ from both sides which favors homogeneous opening behavior. In this case, theoutermost strut 2 is either to be as short as possible or have the fine structures described in greater detail on the basis ofFIGS. 7 and 8 on the edge to suppress flaring. -
FIG. 4 shows a further exemplary embodiment for the stabilization means for additional radial fixing of the stent. Two neighboringmeandering curves 3 of astrut 2 are coupled to one another in the contracted starting position at their edges by hookedcatch elements catch elements elements - In a further exemplary embodiment, the configuration of catch elements in the form of hooked
projections meandering curve 3 is shown by dashed lines inFIG. 4 . This fixing is also produced during crimping by hooking of theprojections hooked projections arbitrary struts 2 along the stent. -
FIGS. 5 and 6 show further exemplary embodiments of the stabilization means for the additional radial fixing of the stent in the cramped state. In these embodiments, fixing traverses 11 shaped in one piece on the boundary struts 2 are provided which connect to the adjacentmeandering curves 3 of astrut 2 fromzenith point 5 tozenith point 5. While only one fixingtraverse 11 is provided inFIG. 5 , in the exemplary embodiment shown inFIG. 6 , the boundary of the stent is completely terminated by a row of fixing traverses 11. - Each fixing
traverse 11 has a double-arched course having acentral bend 12 which acts as the intended breakpoint upon radial expansion of the stent. The stent, as already described in connection with the glued joint 6, may expand homogeneously by the tearing of the fixing traverses 11. - A further exemplary embodiment of the stabilization means provided according to the present disclosure is shown in
FIGS. 7 and 8 . These are peripheral fine structure struts 14 on the boundary at theends 13 of the stent, which are bound to the exterior sides 15 of the meandering curves 3. These fine structure struts 14 are formed in each case by twostruts struts - As schematically indicated in
FIG. 8 , the fine structure struts 14 in the area of the interior groin points 19, which are adjacent to one another in the contracted starting position, are additionally fixed by a glued joint 6 or also catch means (not shown here), for example. The entire stent is thus stabilized on its front-side boundary in the crimped configuration in such a manner that flaring is kept as small as possible. Due to the fixing at the interior groin points 19, the opening forces act on both sides of this fixing, so that higher fixing forces may be overcome without impermissibly distorting the stent structure. - A further exemplary embodiment of the stabilization means for additional radial fixing of the stent is illustrated in
FIGS. 9 and 10 . These are extension struts 20, which run essentially in the axial direction A and are bound to the strut at one end via an intendedbreakpoint 21 to theexternal strut 2. Thefree end 22 of the extension struts 20 is permanently fastened in each case in a suitable maimer to aballoon catheter 23, only schematically indicated inFIG. 9 . - The extension struts 21 again counteract a radial expansion of the
meandering curves 3 of theexternal struts 2, in particular, which suppresses flaring. Upon dilation of the stent, the intendedbreakpoints 21 are torn and the stent is thus released from the extension struts 20. - Exemplary embodiments for stabilization means against flaring shown in
FIGS. 11 and 12 use thex-ray marker projections 24 often present in stents, which are formed as eye-shaped projections onto themeandering curves 3 of theexternal struts 2 and are provided with a thermoplastically moldablemarker polymer coating 25. To use these elements, which are known in stents, as stabilization means against flaring, thex-ray marker projections 24 having theirmarker polymer coating 25 are designed in such a manner that thex-ray marker projections 24 contact one another after the crimping of the stent and are reshaped into a peripheral ring by a thermal treatment of themarker polymer coating 25. The ring formation is supported bytransverse connection elements 26 protruding in the peripheral direction from thex-ray marker projections 24, which may be designed as either I-shaped or T-shaped in a top view. - Finally, it is still possible, as shown in
FIG. 12 , to equip stents with polymer-coatedx-ray marking projections 24 against flaring in such a manner that a peripheral ring made of magnesium, for example, is pushed onto theprojections 24 having theircoating 25 which is embedded therein by heating and brief melting of themarker polymer coating 25 and thus fixed. Thering 27 may comprise rigid material or wire, and may also be laid on only a partial circumferential length around the stent. - All patents, patent applications and publications referred to herein are incorporated by reference in their entirety.
Claims (15)
1. A stent made of a material having a low strength and having a main body circumscribing a cylindrical shape and radially expandable from a contracted starting position into a dilated support position, comprising:
a) a plurality of support segments disposed around the circumference and arrayed on one another in the axial direction each segment being formed by a strut meandering in its coarse structure in its contracted starting position and having alternately opposing meandering curves expandable into the support position made of flexible material;
b) a plurality of axial connectors connecting between zenith points of at least a part of the meandering curves in the axial-parallel direction of the support segments; and
c) at least one means for stabilizing the strut coarse structure in its contracted starting position against radial expansion and being automatically detachable upon a radial expansion of the stent.
2. The stent of claim 1 , wherein the at least one stabilization means is formed by a detachable glued joint between adjacent meandering curves of one or more struts.
3. The stent of claim 2 , wherein the glued joint is attached to boundary and internal struts.
4. The stent of claim 2 , wherein the glued joint is attached in such a manner that the glued joint may be loaded upon radial expansion by tension or shear.
5. The stent of claim 1 , wherein the at least one stabilization means is formed by catch elements which interact with one another on the meandering curves which may be engaged with one another upon transfer of the stent into its contracted starting position and are detachable upon radial expansion of the stent.
6. The stent of claim 5 , wherein the catch elements are formed by hook projections on the meandering curves.
7. The stent of claim 1 , wherein the at least one stabilization means is formed by fixing traverses which connect the boundary meandering curves and may be broken open upon radial expansion.
8. The stent of claim 7 , wherein the fixing traverses run between zenith points of two adjacent meandering curves and have a bend as the intended breakpoint.
9. The stent of claim 1 , wherein the at least one stabilization means is formed by a plurality of fine structure struts peripherally disposed around the boundary of the stent ends.
10. The stent of claim 9 , wherein the plurality of fine structure struts are implemented as double struts folded in a zigzag in a lateral plane of the stent which are fixed on one another at their adjacent groin points in the contracted starting position.
11. The stent of claim 1 , wherein the at least one stabilization means is formed by a plurality of extension struts on the stent which detachably connect the boundary struts to the catheter for placing the stent.
12. The stent of claim 11 , wherein the plurality of extension struts are each bonded to the stent via an intended breakpoint.
13. The stent of claim 1 , further comprising a plurality of x-ray marker projections coated via marker polymer on the boundary struts, wherein the at least one stabilization means is formed by x-ray marker projections coupled in a ring via the marker polymer coating in the contracted state.
14. The stent of claim 13 , wherein the plurality of x-ray marker projections are provided with radially oriented transverse connection elements.
15. The stent of claim 13 , wherein a ring which is embedded in the marker polymer coating is drawn onto the x-ray marker projections in the contracted stent state.
Priority Applications (1)
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US12/977,194 US9005265B2 (en) | 2007-03-31 | 2010-12-23 | Stent having radially expandable main body |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102007015670.9 | 2007-03-31 | ||
DE200710015670 DE102007015670A1 (en) | 2007-03-31 | 2007-03-31 | Stent with radially expandable body |
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US12/977,194 Division US9005265B2 (en) | 2007-03-31 | 2010-12-23 | Stent having radially expandable main body |
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US20080243230A1 true US20080243230A1 (en) | 2008-10-02 |
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ID=39456395
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US12/977,194 Expired - Fee Related US9005265B2 (en) | 2007-03-31 | 2010-12-23 | Stent having radially expandable main body |
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US12/977,194 Expired - Fee Related US9005265B2 (en) | 2007-03-31 | 2010-12-23 | Stent having radially expandable main body |
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US (2) | US20080243230A1 (en) |
EP (1) | EP1974700B1 (en) |
DE (1) | DE102007015670A1 (en) |
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US8303643B2 (en) | 2001-06-27 | 2012-11-06 | Remon Medical Technologies Ltd. | Method and device for electrochemical formation of therapeutic species in vivo |
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US8048150B2 (en) | 2006-04-12 | 2011-11-01 | Boston Scientific Scimed, Inc. | Endoprosthesis having a fiber meshwork disposed thereon |
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US9579185B2 (en) | 2013-02-28 | 2017-02-28 | Boston Scientific Scimed, Inc. | Implantable medical devices for reduced tissue inflammation |
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US20160143724A1 (en) * | 2014-11-20 | 2016-05-26 | Boston Scientific Scimed, Inc. | Tracheal implant |
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Also Published As
Publication number | Publication date |
---|---|
EP1974700A1 (en) | 2008-10-01 |
US9005265B2 (en) | 2015-04-14 |
DE102007015670A1 (en) | 2008-10-02 |
US20110093061A1 (en) | 2011-04-21 |
EP1974700B1 (en) | 2013-05-22 |
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