摘要:
Stents may comprise a bioabsorbable polymer and a plurality of circumferential elements. Circumferential elements that are adjacent to one another may form an adjacent pair that is connected by one or more first connection elements and one or more second connection elements. In some embodiments, the circumferential elements may be formed from undulations having a sinusoidal pattern. The first and second connection elements and portions of the circumferential elements may form a substantially helical pattern across the longitudinal axis of the stent. In one embodiment, the first connection element may include one or more radiopaque markers. In some embodiments, the second connection elements may be curvilinear and may become substantially linear after the expansion of the stent. Curvilinear second connection elements may facilitate the expansion of the stent radially while overall length of the stent remains substantially constant.
摘要:
A method for fabricating an embodiment of a medical device comprising the steps of: preparing a biodegradable polymeric structure; coating the biodegradable polymeric structure with a polymeric coat including a pharmacological or biological agent; cutting the structure into patterns configured to allow for crimping of the cut structure and expansion of the cut structure after crimping into a deployed configuration.
摘要:
An intraluminal endoprosthesis having a conically shaped first end and a tubular shaped balloon-expandable stent (100) for a main body is disclosed. The conically shaped first end may form a flare to the main body and is particularly well suited for in ostium use. The first end is preferably self-expanding and the main body is preferably balloon-expandable (100). Also disclosed is a delivery device for delivering intraluminal ostial endoprosthetic devices, especially those disclosed herein, to a site for deployment. The delivery device may comprise an over-the-wire (500) system or may comprise a rapid-exchange shuttle system. The self-expanding portion (200) of the endoprosthesis is encapsulated in a sheath (520) or other restraining apparatus on the delivery device. The balloon-expandable stent (100) portion of the endoprosthesis is crimped onto a balloon delivery device (530). The delivery system and endoprosthesis of the present invention allow the endoprosthesis to be partially expanded and relocated if it is determined that it is not located in the proper location. To aid in positioning, the delivery device may comprise marker bands (510, 512, 514).