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  Expandable stent and method for delivery of sameUSPTO Application #: 20080021542Title: Expandable stent and method for delivery of same Abstract: An expandable stent having a proximal end and a distal end in communication with one another, and a tubular wall disposed between the proximal end and the distal end. The tubular wall has a longitudinal axis and a porous surface defined by a plurality of intersecting members comprising a series of longitudinal struts disposed substantially parallel to the longitudinal axis of the stent. Each longitudinal strut in the series comprises flexure members for substantially complementary extension and compression of a diametrically opposed pair of the longitudinal struts upon flexure of the stent. The flexure members may comprise first and second curved sections which are of a different size. At least one of the curved sections may comprise an arc of greater than about 180°. (end of abstract) Agent: Patent Administrator Katten Muchin Rosenman LLP - Washington, DC, US Inventors: Ian M. Penn, Donald R. Ricci USPTO Applicaton #: 20080021542 - Class: 623001160 (USPTO) Related Patent Categories: Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor, Arterial Prosthesis (i.e., Blood Vessel), Stent Structure, Having Multiple Connected Bodies The Patent Description & Claims data below is from USPTO Patent Application 20080021542. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This is a continuation application of application Ser. No. 11/419,895, filed May 23, 2006, which is a continuation application of application Ser. No. 10/849,990 (allowed), filed May 21, 2004, which is a continuation of application Ser. No. 09/672,768 (now U.S. Pat. No. 6,758,860, issued Jul. 6, 2004), which is a continuation of application Ser. No. 09/142,509, filed Feb. 18, 1999 (now U.S. Pat. No. 6,183,506, issued Feb. 6, 2001), which is a 371 of PCT/CA97/00152), filed Mar. 5, 1997 (designating the U.S.; and published in English as WO 97/32544 on Sep. 12, 1997), which claims benefit of (i) CA 2,171,047, filed Mar. 5, 1996, (ii) CA 2,175,722, filed May 3, 1996, (iii) CA 2,185,740, filed Sep. 17, 1996, and (iv) CA 2,192,520, filed Dec. 10, 1996, the contents of which are incorporated herein by reference. TECHNICAL FIELD [0002] The present invention relates to an expandable stent. BACKGROUND ART [0003] Stents are generally known. Indeed, the term "stent" has been used interchangeably with terms such as "intraluminal vascular graft" and "expansible prosthesis". As used throughout this specification the term "stent" is intended to have a broad meaning and encompasses any expandable prosthetic device for implantation in a body passageway (e.g. a lumen or artery). [0004] In the past six to eight years, the use of stents has attracted an increasing amount of attention due the potential of these devices to be used, in certain cases, as an alternative to surgery. Generally, a stent is used to obtain and maintain the patency of the body passageway while maintaining the integrity of the passageway. As used in this specification, the term "body passageway" is intended to have a broad meaning and encompasses any duct (e.g. natural or iatrogenic) within the human body and can include a member selected from the group comprising: blood vessels, respiratory ducts, gastrointestinal ducts and the like. [0005] Initial stents were self-expanding, spring-like devices which were inserted in the body passageway in a contracted state. When released, the stent would automatically expand and increase to a final diameter dependent on the size of the stent and the elasticity of the body passageway. An example of such a stent is known in the art as the Wallstent..TM.. [0006] The self-expanding stents were found by some investigators to be deficient since, when deployed, they could place undue, permanent stress on the walls of the body passageway. Further, upon expansion, the stent would shorten in length in an unpredictable fashion thereby reducing the reliability of the stent. This led to the development of various stents which were controllably expandable at the target body passageway so that only sufficient force to maintain the patency of the body passageway was applied in expanding the stent. [0007] Generally, in these later systems, a stent, in association with a balloon, is delivered to the target area of the body passageway by a catheter system. Once the stent has been properly located (for example, for intravascular implantation the target area of the vessel can be filled with a contrast medium to facilitate visualization during fluoroscopy), the balloon is expanded thereby expanding the stent by plastic deformation so that the latter is urged in place against the body passageway. As indicated above, the amount of force applied is at least that necessary to maintain the patency of the body passageway. At this point, the balloon is deflated and withdrawn within the catheter, and subsequently removed. Ideally, the stent will remain in place and maintain the target area of the body passageway substantially free of blockage (or narrowing). [0008] A stent which has gained some notoriety in the art is known as the Palmaz-Schatz..TM.. Balloon Expandable Stent (hereinafter referred to as "the Palmaz-Schatz stent"). This stent is discussed in a number of patents including U.S. Pat. Nos. 4,733,665, 4,739,762, 5,102,417 and 5,316,023, the contents of each of which are hereby incorporated by reference. [0009] Another stent which has gained some notoriety in the art is known as the Gianturco-Roubin Flex-Stent..TM.. (hereinafter referred to as "the Gianturco-Roubin stent"). This stent is discussed in a number of patents, including U.S. Pat. Nos. 4,800,882, 4,907,336 and 5,041,126, the contents of each of which are hereby incorporated by reference. [0010] Other types of stents are disclosed in the following patents: [0011] U.S. Pat. No. 5,035,706 (Gianturco et al.), [0012] U.S. Pat. No. 5,037,392 (Hillstead), [0013] U.S. Pat. No. 5,147,385 (Beck et al.), [0014] U.S. Pat. No. 5,282,824 (Gianturco), [0015] Canadian patent 1,239,755 (Wallsten), and [0016] Canadian patent 1,245,527 (Gianturco et al.), the contents of each of which are hereby incorporated by reference. [0017] While these prior art stents have achieved a varying degree of success, the art is constantly in need of new stents having improved flexibility and stability while being able to be readily implanted with little or no trauma to the target lumen. [0018] In our Canadian patent application number 2,134,997 (Penn et al.), the contents of which are hereby incorporated by reference, there is described an improved expandable stent. The stent comprises a tubular wall disposed between the proximal end and the distal end. The tubular wall has a longitudinal axis and a porous surface defined by a plurality intersecting members arranged to define a first repeating pattern. The first repeating pattern comprises a polygon having a pair of side walls substantially parallel to the longitudinal axis. A first concave-shaped wall and a second convex-shaped wall connect the side walls. The first wall and the second wall are equidistant along an axis which is parallel to the longitudinal axis. The stent is expandable from a first, contracted position to a second, expanded position upon the application of a radially outward force exerted on the stent. [0019] As disclosed in the '997 application, the first repeating pattern can be implemented in, inter alia, a mono-tubular expandable stent and a bifurcated expandable stent. [0020] While the stent disclosed in the '997 application is an advance in the art, in certain cases, a significant force is required to achieve expansion in the target body passageway. Further, implantation of the stent disclosed in the '997 application can be difficult in certain situations where the unexpanded stent must travel through a significantly curved pathway to the target body passageway. [0021] Accordingly, it would be desirable to have an improved stent which overcomes these disadvantages. It would be further desirable if the improved stent could be readily adapted, inter alia, to mono-tubular expandable stents and bifurcated expandable stents. The latter type of stents would be useful in treating aneurysms, blockages and other ailments. It would also be desirable if such a stent was relatively easy to implant. It would be further desirable if such a stent were capable of being uniformly expanded at relatively low pressure while obviating or mitigating longitudinal shrinkage thereof. It would be further desirable if such a stent were not susceptible to asymmetric internal coverage of the body passageway, a problem associated with "coil"-type stents--see, for example. U.S. Pat. No. 5,282,824 (Gianturco). It would be further desirable if such a stent was not susceptible to movement along the longitudinal axis of the body passageway during or after implantation. It would be further desirable if such a stent was characterized by a desirable balance of lateral flexibility in the unexpanded state and radial rigidity in the expanded state. DISCLOSURE OF THE INVENTION Continue reading... Full patent description for Expandable stent and method for delivery of same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Expandable stent and method for delivery of same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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