Methods and devices for maintaining patency of surgically created channels in a body organ
This is directed to methods and devices suited for maintaining an opening in a wall of a body organ for an extended period. More particularly devices and methods are directed maintaining patency of channels that alter gaseous flow within a lung to improve the expiration cycle of, for instance, an individual having chronic obstructive pulmonary disease.
1 . An implant for maintaining an artificial opening in a wall of a body organ, the implant comprising:
a support member having a proximal portion, a mid portion, a distal portion, and an interior passage extending therethrough, where the proximal, and distal portions are all expandable and the proximal and distal portions are expandable to a greater size than the mid portion so that the support member forms a grommet shape;
a non-bioabsorbable polymer comprising a plurality of diffusion paths having at least one additive, where the additive is water soluble; and
an antiproliferative agent, where on implantation of the implant into the airway wall and upon dissolving of the additive, the plurality of diffusion paths allow for improved passage of the antiproliferative agent into the airway wall.
3 . The implant of claim 1 , where the composition comprises an amount of antiproliferative agent that does not exhibit substantial cytotoxicity but controls the healing response by suppressing hyperplasia of lung tissue, to maintain patency of an artificial opening located in the airway which allows for maintaining air passage between the opening and parenchyma for a sufficient time until the healing response of the lung tissue subsides such that the opening essentially becomes a natural airway passage.
4 . The implant of claim 1 , where the polymer is selected from a group consisting of thermoplastic polymers, thermoset polymers, acrylate polymers, a blend of acrylate-methacrylate polymers, silicone elastomers, urethane elastomers, ethylene vinyl acetate polymers, polyethylene, polypropylene, PLA-PGA, PLA, PGA, polyortho-ester, polycapralactone, polyester, hydrogels, polystyrene, co-polymers of styrene-isobutylene-styrene, and combinations or blends thereof.
5 . The implant of claim 1 , where the support member comprises a metallic material.
6 . The implant of claim 1 , where the antiproliferative substance comprises a microtubule stabilizing agent.
7 . The implant of claim 1 , where the microtubule stabilizing agent is paclitaxel.
8 . The implant of claim 1 , where the antiproliferative substance comprises a microtubule destabilizing agent.
9 . The implant of claim 1 , where the microtubule destabilizing agent is selected from the group comprising vincristine, vinblastine, podophylotoxin, estramustine, noscapine, griseofulvin, dicoumarol, a vinca alkaloid, and a combination thereof.
10 . The implant of claim 1 , where the antiproliferative substance comprises a substance selected from the group consisting of steroids, non-steroidal anti-inflammatories, and d-actinomycin, and a combination thereof.
11 . The implant of claim 1 , where the antiproliferative substance comprises a cytostatic agent.
12 . The implant of claim 11 , where the cytostatic agent is selected from the group consisting of: sirolimus, everolimus, ABT-578, biolimus, tacrolimus, and a combination thereof.