Abstract:
An implantable medical support frame (104) having a central longitudinally extending axis is expandable from a collapsed configuration having a first diameter to an expanded configuration having a second diameter. The frame also includes an anchoring mechanism with an elongate member (110). At least a portion of the elongate member is slidably disposed within a retaining structure when the frame is in the collapsed configuration. When the frame expands from the collapsed configuration to the expanded configuration, a portion of the elongate member is advanced out of the retaining structure such that the portion of the elongate member protrudes radially outward of the frame at an angle to the axis, thereby forming an anchor. A length of the protruding portion of the anchor increases as the frame expands from the collapsed configuration to the expanded configuration.
Abstract:
Various stent structures are provided with improved axial and torsional flexibility. One type of stent structure includes multiple segmented stent structures connected to each other by biodegradable interconnectors. A delivery system adapted to delivery the multiple segmented stents is also described. Another type of stent structure includes biodegradable connectors that are incorporated into a framework of non-biodegradable interconnecting members that form the support structure of the stent. The biodegradable connectors in both stent structures degrade or are absorbed after the stent is deployed. Stabilizing elements may be provided to the stent structures to supplement the stiffness of the stent with stability during loading and deployment.
Abstract:
A device for delivering and deploying a radially expandable prosthesis is disclosed and comprises a proximal prosthesis release mechanism (24) having a first resistance and a distal prosthesis release mechanism (22) having a second resistance. The device further comprises an actuation mechanism (27) for actuating the distal and proximal release mechanisms in a single coordinated movement and a biasing compensator (60) for regulating the relationship between the first resistance and the second resistance. Additional aspects of the invention include devices and methods for delivering and deploying a radially expandable prosthesis.
Abstract:
A strut, or beam, is provided for intraluminal devices. Strain which is introduced into a stent or other intraluminal device is distributed more evenly along the length of the improved strut by maintaining a substantially constant strain level along the length of an end portion. This may increase fatigue life or improve the performance of devices using the improved strut. The strain along the length of the end portion may be maintained substantially constant by varying a section property of the strut, including the width, thickness, cross-sectional area, material property or other characteristic of the end portion.
Abstract:
An endoluminal device (170) comprises a stent and a tubular graft supported by the stent. The graft has a proximal (174) and a distal opening (176) and comprises a synthetic material and a bioremodelable material. The bioremodelable material is disposed on an exterior surface in at least one band (171) adjacent at least one of the proximal and distal openings.
Abstract:
Various stent-graft systems for treatment of medical conditions are disclosed. In one embodiment, an exemplary stent-graft system may be used for endovascular treatment of a thoracic aortic aneurysm. The stent-graft system (800) comprises proximal (802) and distal (822) components, each comprising a graft (805, 825) having proximal and distal ends, where upon deployment the proximal and distal components at least partially overlap with one another to provide a fluid passageway therebetween. The proximal component comprises a proximal stent (804) having a plurality of proximal and distal apices connected by a plurality of generally straight portions, where a radius of curvature of at least one of the proximal apices greater than the radius of H is curvature of at least one of the distal apices. The distal component comprises a proximal z- stent (830a) coupled to the graft (825), where the proximal end of the graft comprises at least a scallop (845) formed therein that generally follows the shape of the proximal z- stent. Further, the distal component may comprise at least one z- stent (834) coupled to the distal end of the graft and extending distally therefrom that reduces proximal migration of the distal component.
Abstract:
A barb for anchoring an implantable medical device to a body vessel comprises a thin-walled body portion for engagement with a structural element of an implantable medical device and a penetrating element extending from the body portion. The body portion has a longitudinal axis. The penetrating element includes a tip portion for anchoring into tissue and a base portion between the tip portion and the body portion. In a deployed configuration of the barb, the base portion curves away from the longitudinal axis at a first curvature and the tip portion curves toward the longitudinal axis at a second curvature which is opposite in sign from the first.
Abstract:
The present invention provides a stent having less invasive ends and improved radial force. In one embodiment, the stent comprises a series of proximal apices disposed at a proximal end of the stent, a series of distal apices disposed at a distal end of the stent, and at least one angled strut segment disposed between the proximal and distal apices of the stent. At least one apex of the stent may comprise multiple curved portions. In one example, the radius of curvature of one of the curved portions is significantly greater, for example, at least 10 times greater, than each of the other radii of curvature of the apex. The curved portion having the significantly greater radius of curvature may be configured to engage a vessel wall in a less invasive manner.
Abstract:
A self-expanding or otherwise expandable artificial valve prostheses for deployment within a body passageway, such as a vessel or duct of a patient. The valve prostheses include a support structure having an outer frame, a supporting member and a valve leaflet. The portion of the valve leaflet is supported by the supporting member and is positioned away from the wall of the body passageway when the device is deployed within the body passageway.
Abstract:
A self-expanding or otherwise expandable artificial valve prostheses for deployment within a body passageway, such as a vessel or duct of a patient. The valve prostheses include a support structure having an outer frame, a supporting member and a valve leaflet. The portion of the valve leaflet is supported by the supporting member and is positioned away from the wall of the body passageway when the device is deployed within the body passageway.