Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent structure
Patent
1997-12-05
2000-05-16
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent structure
606200, A61F 206
Patent
active
060631139
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for implantation in a vessel or hollow organ lumen in a human or animal body, such as a self-expanding stent, a cava filter, an embolizing means or a supporting means, the device comprising a wire frame with a plurality of interconnected cells made of at least two separate wire sections which are intercrossing at cell junctions and form closed cells.
Medical implantation devices to which the invention pertains have found wide-spread use in percutaneous vascular and cardiac surgery and comprise in particular stents, intravenous filter devices for the capture of thrombi in major veins such as the lower caval vein and occlusion devices for permanent or temporary obturation of a vessel lumen or permanent occlusion of defects in vascular walls such as an ASD in the atrial septum, a PDA defect or other defects in vascular walls such as the inlet of an exfoliative aneurism of the aorta or a puncture hole in connection with angiographic investigation.
A stent is a device that can be placed within the lumen, or interior space, of a tubular structure for supporting and assuring patency of a lumen, viz. re-opening of or keeping the lumen open. Stents are used, for example, for holding blood vessels open or for back tacking intimal flaps inside vessels after angioplasty. More generally, however, stents can be used inside the lumina of any physiological conduit including arteries, veins, vessels, the bilary tree, the urinary tract, the alimentary tract, the tracheobronchial tree, the genitourinary system, and the cerebral aqueduct.
The above mentioned device in the form of a self-expanding stent is known from W094/03127 where the cells have a mainly square shape in a developed view. The wire sections are twisted one turn about each other about a twist axis extending in the longitudinal direction of the tubular frame body. When a stent with such cell junctions is subjected to a radial inwards pressure in a local area the cell junctions act as hinge joints allowing the cells in the pressure affected area to collapse at a relatively low pressure loading. This drawback may disqualify use of the stent in a body vessel positioned in vicinity of rigid structures such as a bone, because the pressure from such structure may cause a significant reduction of the vessel lumen due to collapsed cells.
A number of other implantation devices are known. EP-B-0 221 570 describes an expandable graft having a frame body made of a plurality of wires extending helically in opposite directions through the body. The wires may in one embodiment be woven in a criss-crossed pattern, but this does not provide cells of well-defined size br shape, because the wires may easily slide at the wire intersections. In another embodiment this is prevented by fixing the wires at the intersections by soldering, welding, or gluing. Such fixing involves the rather serious drawback that the resulting device comprises additional substances which may cause tissue reactions. A similar drawback is present in the vascular stents known from e.g. US-A-5 370 683, and EP-A-0 556 850 where the wire sections are joined by a ring of suture material at the cell junctions. In addition this latter embodiment is very time-consuming to manufacture. W094/12136 describes a stent for use in the esophagus. The stent is formed by very loosely interknitted loops of filament so that each loop is free to slide with respect of the other loops. The sliding allows the stent to follow movements of the esophagus without axial movement of the stent, when the person is swallowing.
EP-A-0 622 088 shows coupling of two or more Z-shaped stents in an end-to-end configuration by providing the stents with eyes, at the stent ends, hooking the eyes into one another and closing the eyes by soldering, which also introduces additional substances.
An object of the present invention is to provide a device for implantation having cells which are rigidly interlocked and have a relatively large rigidity to local radial compression without requiring use of additional substanc
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Kavteladze Zaza A.
Korshok Alexander P
Godlewski Richard J.
Jackson Suzette J.
William Cook Europe ApS
Willse David H.
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