in the following description , various aspects of the present invention will be described . for purposes of explanation , specific configurations and details are set forth in order to provide a thorough understanding of the present invention . however , it will also be apparent to one skilled in the art that the present invention may be practiced without the specific details presented herein . furthermore , well known features may be omitted or simplified in order not to obscure the present invention . a stent according to embodiments of the present invention may be inserted into a body , typically via a body cavity , and may be implanted into any suitable lumen or body cavity passageway , for example , blood vessels or the pancreatic or bile ducts . a stent according to embodiments of the present invention may include a passageway and two or more openings , with at least one opening at each end that may allow matter such as fluid to flow through the stent . an opening may be the area where material enters or exits the passageway . “ openings ” when used herein typically do not include holes that are part of the material of the stent . for example , in a stent according to the present invention made of wire mesh , the holes in the wire mesh may not be considered “ openings ”. the stent according to some embodiments typically has two ends , but may have more ends . an opening may be located at each end of the stent . the stent may have multiple openings at each end . in various embodiments , the stent may take any suitable form or design , including , for example , any suitable curvature , protrusions , length or diameter and may be made out of any suitable material , for example , wire , wire mesh , plastic , silicone , or a suitable polymer , for example , biocompatible or medical grade polymer . in some embodiments the stent does not include holes or a mesh in the body of the stent . the stent may be configured as a tube such as a straight tube or as a “ t - tube ” or a “ c - tube ”. a tube may refer to a passageway with two or more openings of any suitable design including , for example , any suitable curvature , protrusions , length or diameter . in some embodiments , during removal from an in - vivo site , the stent is not collapsed or destroyed . a stent according to embodiments of the present invention may be , for example , more efficiently , inexpensively or easily removed . reference is made to fig1 , a diagram of an exemplary embodiment of a stent . stent 10 may include a tube 18 having openings 12 and 12 ′. protruding tip 14 may be part of a cut or angled opening 12 ′. stent 10 may be produced by , for example , cutting along the tip or edge of a stent opening to form stent 10 with a protruding tip 14 at its opening 12 ′. other methods of producing stent 10 may be used ; for example stent 10 may be formed by molding . in one embodiment stent 10 may be cut at an opening such as opening 12 ′, where the line of a cut or where the tangent line along the curve of a cut is not perpendicular to the axis of the stent 10 . the axis of a stent may be any line that runs along the length of the stent , for example , a line , contained in the stent passageway , whose points are equidistant from the points of the stent passageway . the cut may be curved so that a narrower tip is formed , but in other embodiments may be straight . in another embodiment stent 10 may be cut at an opening , such as opening 12 ′, such that a section of the cut edge of stent 10 may protrude farther from a perpendicular cross - section of stent 10 than any other section of the cut edge , where the perpendicular cross - section may be taken closest to the end of the cut opening where the cross - section is fully contained by the stent 10 material . in another embodiment a stent may be cut at an opening , such that some portion of the edge 14 of the open end of stent 10 extends further along the axis of stent 10 than the rest of the edge . reference is made to fig2 , a diagram of a stent according to one embodiment of the invention . stent 20 may include a tube 28 with openings 22 and 22 ′. stent 20 may include a bead , extension , handle or bulge 24 at a protruding tip 23 . bulge 24 of stent 20 may be produced , for example , by melting a stent tip 23 at an opening , for example , by melting tip 14 . on melting , the tip 14 or bulge 24 may enlarge or change shape somewhat . stent 20 may be made of any material that can melt or may be viscous at certain temperatures , for example , plastic , silicone , suitable polymers or various metal materials including wire mesh . in other embodiments , a bulge , bead or handle may be produced by a different method , such as forming in a mold , bending , compression , or by use of appropriate glues , additional hardenable substances , etc . reference is made to fig3 , a diagram of a stent according to one embodiment of the invention . stent 30 may include a tube 38 with openings 32 and 32 ′, and an appendage , attachment or extension 35 . stent 30 and extension 35 in one embodiment are not part of one continuous material , but rather are attached during manufacturing . any suitable extension 35 , for example , a string , wire or hook , may be connected to the stent 30 . stent 30 and extension 35 may be connected by a connection point or interface or connector 34 , for example , along edge 36 of opening 32 ′. stent 30 and extension 35 may be connected at one or more open ends . connector 34 may be any suitable interface that may secure the extension 35 to the stent 30 . for example , in one embodiment , stent 30 may be made of plastic and extension 35 may be made of plastic thread or metal wire . in this exemplary embodiment , connector 34 may be a melted interface that connects stent 30 and extension 35 . in another embodiment , stent 30 may be made of wire mesh and extension 35 may be made of for example metal wire . other suitable materials may be used . connector 34 may be for example a clasp or knot that connects stent 30 and extension 35 . in other embodiments , the stent tube 38 and the extension may be of the same material , and may be formed of one continuous integral piece of material . in one embodiment a connector need not be used . a stent according to embodiments of the present invention may be made of any suitable material , for example , plastic , silicone , a suitable polymer , metal , wire mesh and may take any suitable design including , for example , any suitable curvature , protrusions ; length or diameter and may be inserted into any suitable lumen , for example , blood vessels or the pancreatic or bile ducts . in some embodiments a protrusion or attachment ( such as tip 14 , bulge 24 or extension 35 ) may aid in securing a stent to a stent removal device , for example , forceps , a clasp or a hook or any other suitable device that may secure a stent for example at its tip . the stent may be removed , for example , by pulling or exerting force on the protrusion or attachment . the stent may be removed , for example , with forceps that may enter the body for example , via an endoscope . other methods of removal may be used . securing or grabbing prior art stents may be difficult since there may not be a defined protrusion for the grasping device to clasp . the grasping device may clasp the side of the stent , which may cause the stent to fold or bend during removal , which may be harmful . a stent according to embodiments of the present invention may be grabbed or secured more easily at its tip than prior art stents . the stent may then be removed from the body , for example , by pulling . this may exert a force on the protrusion or extension , instead . of exerting a force along the body of the stent that may cause the stent to bend or fold during removal . a stent according to embodiments of the present invention may be secured and removed in a more desirable orientation and may be less likely to bend or fold during removal than a prior art stent . selecting which opening to modify may be irrelevant in the case where a stent is symmetric . however , a stent may have asymmetric features that may make the stent &# 39 ; s specific orientations inside the body preferable . a stent according to some embodiments of the present invention may be designed so that its protrusion may be preferably oriented for stent removal . embodiments of the present invention include producing a stent , such as an embodiment of a stent described above or shown in fig1 - 3 . in one embodiment , a stent may be cut at an opening to produce for example , a protruding tip . the stent may be made of , for example , plastic , or solid material . in one embodiment , a stent may be melted at a tip to produce for example a bulge . the foregoing description of the embodiments of the invention has been presented for the purposes of illustration and description . it is not intended to be exhaustive or to limit the invention to the precise form disclosed . it should be appreciated by persons skilled in the art that many modifications , variations , substitutions , changes , and equivalents are possible in light of the above teaching . it is , therefore , to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention .
a removable stent may include , for example , an extension or protrusion , or a cut or angled end , which may be easily grasped for removal by for example forceps . a stent may be molded to form such graspable extensions , or may be cut and / or melted or otherwise deformed as part of manufacture .