RU2001124332A - Expandable Stent - Google Patents

Claims (13)

1. An expandable intracavitary stent containing a tubular element containing a set of ladder elements engaged with sliding, each ladder element containing at least one radially placed elongated rib, each of which has two ends and at least two end steps, while an end step is attached to each end of each elongated rib, the elongated rib of the first ladder element being engaged with the sliding part of the end step of the second ladder element a, so that the radial sliding of these stair elements creates a distance with a variable radius between the end steps of the first and second stair elements, said tubular element has a first diameter, in which the distance between the end steps of the first and second stair elements is compressed and said tubular element has a second diameter, in which the distance between the end steps of the first and second, stair elements is expanded. 2. The expandable stent according to claim 1, wherein the at least one elongated rib on each stair element has a plurality of slots adapted to engage a locking protrusion on an end step of an adjacent stair element. 3. The expandable stent according to claim 2, wherein said slots and locking protrusions allow the end steps to slide apart, thereby expanding the diameter of the tubular member, but wherein said locking protrusions engage said slots to prevent the end steps from sliding back to the more compressed condition. 4. The expandable stent according to claim 1, wherein said tubular element expands from a first, compressed diameter to a second, expanded diameter when an expanding force directed radially outward from the inside of the tubular element is applied. 5. The expandable stent according to claim 1, wherein said tubular element independently expands to a second, expanded diameter while removing a stop that holds the tubular element in a first, compressed diameter. 6. The expandable stent according to claim 1, in which the ladder elements are made of an alloy selected from the group consisting of stainless steel, elgiloy, tantalum, titanium and nitinol. 7. The expandable stent according to claim 1, in which the ladder elements are made of at least one bioabsorbable material selected from the group consisting of polypeptides, polydepsipeptides, copolymers of nylon, aliphatic polyesters, polydihydropyrans, polyphosphazenes, polyorthoesters, polycyanoacrylates and their derivatives. 8. The expandable stent according to claim 7, wherein a bioactive agent embedded in a bioabsorbable material is selected from the group consisting of heparin, hirudin, warfarin, ticlopidine, dipyridamole, GPIIb / IIIa receptor blockers, thromboxane inhibitors, serotonin antagonists, prostanoids, calcium blockers channels, PDGF antagonists, ACE inhibitors, angiopeptin, enoxaparin, colchicine, steroids, non-steroidal anti-inflammatory drugs, VEGF, adenovirus, enzymes, sterol, hydroxylase, antisensor sequences, fish oils, HMG, ing Co-A reductase inhibitors, ibutilide fumarate, adenyl cyclase, growth factors, nitric oxide, proteins, peptides and carbohydrates. 9. The expandable stent according to claim 1, wherein at least a portion of the stent is opaque. 10. The expandable stent according to claim 1, wherein the stent may have a wall thickness in the range of from about 0.01 to about 0.0001 inches. 11. The expandable stent according to claim 1, wherein the stent may have a wall thickness of less than about 0.0007 inches. 12. The expandable stent according to claim 1, in which the width of the elongated ribs gradually increases from the narrow end to the wide end. 13. The expandable stent according to claim 1, in which the tubular element further comprises a casing.