Patent RU-2433805-C2 (RU)
Inventor: SHMID EHRIK V
IPC: A61F2/92
Filed: 2006-07-28
Granted: 2011-11-20
Abstract: FIELD: medicine. 
     SUBSTANCE: invention relates to medical equipment, namely, to expanding medical implants for supporting space of body cavity in open state. Sliding and fixed stent contains tubular element, expanded from compressed state into expanded state. Tubular element contains, at least, one sliding and fixed section. Section contains separate first and second axially inserted, connected with possibility of sliding, elements. First and second elements contain more than one material. At least, one of elements contains, at least, one withdrawable unit, made with possibility of withdrawal during expansion from compressed into expanded state with resistance to reverse motion, and in which no part of any elements passes through coupled slots in another element. In the second version of implementation tubular element of stent contains first peripheral sliding and fixed section and second peripheral sliding and fixed section. Said sections are located in longitudinal direction and are connected. Each of sections contains first axial element and second axial element. Axial elements are displaced in axial direction and are connected by means of providing mutual gear hingedly connected mechanism. First axial element contains, at least, one first rib, with, at least, one protruding outside in axial direction tooth. Second axial element contains, at least, second rib, with at least, one protruding inside in axial direction tooth. Protruding outside and inside teeth interact with each other during expansion and are made with possibility of ensuring unilateral sliding between first and second axial elements in such a way that, at least, one of first and second rib of first and second axial elements are withdrawn in axial direction during expansion from compressed diameter to expanded diameter. In third element of implication stent contains flexible connecting section, connecting peripheral sections. Each of peripheral sections contains first sliding and fixed element and second sliding and fixed element. Respective sliding and fixed elements of each peripheral section are radially connected with sliding hinge mechanism. Each of first sliding and fixed elements contains, at least, one limiter. Each of second sliding and fixed elements contains, at least, one end limiter. During expansion, limiters of first sliding and fixed elements interact with respective end limiters of second and fixed elements. Limiters are made with providing possibility of unilateral sliding between respective first and second sliding and fixed elements in such a way that, at least, part of respective first and second elements are withdrawn in radial direction during expansion from first diameter to second diameter. System for treating section inside vessel contains catheter with means of expansion and any of mentioned above stents. Catheter is adapted to moving stent to said section, and said means of expansion are adapted for stent expansion. Method of re-treatment of body cavity includes stages of expansion on section of said body cavity of any of mentioned above stents and carrying out on said section second treatment. Said stent is made from biologically bioresorbable polymer. 
     EFFECT: claimed stent is compact and sufficiently flexible during compression for possibility of easy delivery to affected region; is sufficiently flexible during expansion for corresponding to the shape of affected body cavity; nonuniformly expands to desired diameter without changing length; preserves expanded diameter without considerable reverse motion; and has sufficient frame for providing clear through lumen. 
     77 cl, 63 dwg