A retrievable stent and retrieval catheter for biological usage.

A retrievable stent and retrieval catheter for biological usage.

A method of connecting an expansion ring to at least one end of a braided implant, the method including positioning the braided implant about a tube; everting an end portion of the braided implant over a first end of the tube; assembling an expansion ring to the braided implant, the expansion ring being a multi-leaved expansion ring comprising clips terminating with an open-ended coupling opening, wherein the openings are pushed over a set of intersecting wires of the braided implant at respective circumferential locations on or adjacent the first end of the tube; closing the openings over the set of intersecting wire; trimming ends of the braided implant; and reversing eversion of the braided implant thereby positioning the expansion ring internal to the braided implant.

A method of connecting an expansion ring to at least one end of a braided implant, the method including positioning the braided implant about a tube; everting an end portion of the braided implant over a first end of the tube; assembling an expansion ring to the braided implant, the expansion ring being a multi-leaved expansion ring comprising clips terminating with an open-ended coupling opening, wherein the openings are pushed over a set of intersecting wires of the braided implant at respective circumferential locations on or adjacent the first end of the tube; closing the openings over the set of intersecting wire; trimming ends of the braided implant; and reversing eversion of the braided implant thereby positioning the expansion ring internal to the braided implant.

A stent is provided having a plurality of intersecting elongated members arranged to form a plurality of cells, which define an elongated tube with a lumen. The elongated tube has first and second sections, the first section having a substantially constant first diameter, the second section having a substantially constant second diameter that is larger than the first diameter. The elongated tube also has a transition section between the first and second sections, the transition section having a concave curvature extending proximally from the first section and a convex curvature extending proximally from the concave curvature to the second portion. A proximal end of the second section has a plurality of rounded ends formed by the plurality of intersecting elongated members. Each of the plurality of cells within the first section have a pitch that is tighter than each of the plurality of cells within the second section.

A stent is provided having a plurality of intersecting elongated members arranged to form a plurality of cells, the plurality of cells defining an elongated tube with a lumen running therethrough. The elongated tube has first, second, and third sections, the first section having a substantially first diameter and the third section having a substantially constant second diameter that is larger than the substantially constant first diameter of the first section, wherein the diameter of the second section transitions from the first diameter to the second diameter. Each of the plurality of cells within the first section have a pitch that is tighter than each of the plurality of cells within the second and third sections. In the second section, the plurality of intersecting elongated members includes a plurality of pairs of elongated members, wherein each pair of elongated members includes two adjacent elongated members twisted axially around each other.

This disclosure concerns medical devices, such as catheters and implantable devices, having radially adjustable features. More particularly, the catheters and implantable devices can radially expand and contract to perform various functions within the body. Expansion and contraction can be performed by a radially adjustable structure mounted on the medical device. For example, a medical device can include an body configured for in vivo introduction, a strip attached to the body and rolled into a ring such that layers of the strip radially overlap each other, and at least one motor actuatable by electrical energy to move the radially overlapping layers of the strip relative to one another and change a diameter of the ring and the body.

This disclosure concerns medical devices, such as catheters and implantable devices, having radially adjustable features. More particularly, the catheters and implantable devices can radially expand and contract to perform various functions within the body. Expansion and contraction can be performed by a radially adjustable structure mounted on the medical device. For example, a medical device can include an body configured for in vivo introduction, a strip attached to the body and rolled into a ring such that layers of the strip radially overlap each other, and at least one motor actuatable by electrical energy to move the radially overlapping layers of the strip relative to one another and change a diameter of the ring and the body.

A medical device comprises a substrate (10) defining a major surface (9) defining a plane, including a plurality of first struts (14) along a first direction interconnected with a plurality of second struts (12) extending along a second direction not parallel with the first direction, wherein widths (11) of the second struts as measured along the major surface are larger than thicknesses of the second struts as measured perpendicular to the major surface such that when the substrate is stretched in the first direction, intermediate sections (15) of the second struts (12) rotate relative to the first struts (14) and the intermediate sections of the second struts bend out of the plane of the major surface. The medical device is operable to extend and/or retract elements suitable for a particular purpose. The elements are extended and/or retracted in response to a stress applied by way of stretching and/or retracting the device, among other methods. The elements may remain extended and/or retracted or may recoil back to an initial position upon the removal of the force. In various embodiments, the elements are used to treat or deliver treatment to a target site within a body.

A stent delivery system can include a core member, an introducer sheath, and a microcatheter. The core member can have a first section and a second section distal to the first section. The second section can have a bending stiffness per unit length that is less than a bending stiffness per unit length of the first section. The introducer sheath can have a lumen configured to receive the core member therethrough. The introducer sheath can have a length of at least about 80 cm. The microcatheter can have a lumen and a proximal end configured to interface with a distal end of the introducer sheath for delivering the core member into the microcatheter lumen.