摘要:
An occlusion device and method for occluding an undesirable passage through tissue, such as a septal defect, that provides an expandable cylinder or other structure that occludes the passage internally or by covering one or more openings to the passage. The occlusion device includes a wire lattice or mesh that expands from a contracted catheter-deliverable state to an expanded state that occludes the passage. The lattice or mesh has one or more layers, with layers that provide structural support to the device, and layers that provide a lattice braiding or pore sizes that promote further occlusion by a biological process, such as tissue ingrowth that further occludes the affected passage.
摘要:
Devices and methods for forming a tubular braid comprising a plurality of filaments. The braiding machine includes a circular array of filament guiding members defining a plane; a mandrel defining an axis and adapted to carry one or more filaments extending from the mandrel to the circular array; a plurality of filaments extending from the mandrel in a radial array; a plurality of actuator mechanisms disposed operably about the disc; and a rotating mechanism adapted to rotate one or more filaments. The actuator mechanisms and rotating mechanism are configured to move each of the one or more filaments about the mandrel axis in a path comprising a series of arcs and radial movements. The braiding machine may alternately first and second annular members, a mandrel, first and second plurality of tubular wire guides, and a plurality of wires extending from the mandrel.
摘要:
Devices and methods for forming a tubular braid comprising a plurality of filaments. The braiding machine includes a circular array of filament guiding members defining a plane; a mandrel defining an axis and adapted to carry one or more filaments extending from the mandrel to the circular array; a plurality of filaments extending from the mandrel in a radial array; a plurality of actuator mechanisms disposed operably about the disc; and a rotating mechanism adapted to rotate one or more filaments. The actuator mechanisms and rotating mechanism are configured to move each of the one or more filaments about the mandrel axis in a path comprising a series of arcs and radial movements. The braiding machine may alternately first and second annular members, a mandrel, first and second plurality of tubular wire guides, and a plurality of wires extending from the mandrel.
摘要:
Methods and articles for fabricating expansive stents having generally cylindrical configurations with a pattern therein include interconnecting portions from a generally planar sheet of material with a central portion. A pattern is formed in the sheet of material around said central portion corresponding to said pattern having interconnecting portions. The pattern has a generally circular outer margin. The pattern is separated from the sheet of material and causes relative movement between the central portion of the pattern and the outer circular margin in a direction perpendicular to the plane of the central portion. The pattern is transformed from one sheet form into one in cylindrical form to provide an expansible stent having a generally cylindrical configuration.
摘要:
The present invention provides controlled expansion endoluminal prostheses and methods for their deployment and expansion. The present stent-grafts generally comprise a radially expansible tubular frame and a plastically expansible liner on the frame. Either the frame or the liner includes a reinforcing element which limits expansion of the stent-graft at a predetermined expanded size. In some embodiments, the reinforcing element restrains the frame, for example, by limiting the circumferential diagonals of perforations on a perforate frame structure. Generally, however, the reinforcing element is included in the liner as circumferentially oriented yarn. A particularly advantageous liner includes composite circumferential yarns having inexpansible fibers wrapped around an expansible fiber, such as a partially oriented yarn, PTFE, or the like.
摘要:
A laser-directed ranging system for use in telerobotics applications and other applications involving physically handicapped individuals. The ranging system includes a left and right video camera mounted on a camera platform, and a remotely positioned operator. The position of the camera platform is controlled by three servo motors to orient the roll axis, pitch axis and yaw axis of the video cameras, based upon an operator input such as head motion. A laser is provided between the left and right video camera and is directed by the user to point to a target device. The images produced by the left and right video cameras are processed to eliminate all background images except for the spot created by the laser. This processing is performed by creating a digital image of the target prior to illumination by the laser, and then eliminating common pixels from the subsequent digital image which includes the laser spot. The horizontal disparity between the two processed images is calculated for use in a stereometric ranging analysis from which range is determined.
摘要:
A multiple-layer microstrip assembly having an inter-layer connection for transitioning electrical signals between analogous surfaces of separate layers, comprising a plurality of layers, each having a top surface and a bottom surface; first top circuitry disposed on the first top surface of a first layer; first bottom circuitry disposed on the first bottom surface of the first layer; connecting means for electrically connecting the first top circuitry to the first bottom circuitry; second top circuitry disposed on the second top surface of a second layer; and binding means to hold the two layers together, wherein the first bottom circuitry is sufficiently adjacent and overlapping the second top circuitry to form an electrical connection therebetween, thereby forming a signal transition between the first top surface of the first layer and the second top surface of the second layer.
摘要:
The present application discloses an apparatus for treating vascular aneurysms and includes a radially expandable substantially cylindrical structure formed from a plurality of support members and defining a plurality of openings, and at least one reactive material strand selectively integrated into the substantially cylindrical structure. The reactive material is configured to assume a non-reacted state and a reacted state. The reactive material in the reacted state is configured to restrict a flow of blood to an aneurysm.
摘要:
Expandable prosthetic valve devices for repair or replacement of a native valve in a heart of a patient and associated, systems and methods are disclosed herein. An expandable prosthetic valve device configured in accordance with a particular embodiment of the present technology can include a radially-expandable support having an expandable outer wall and a lumen defined by the outer wall. The device can also include a valve in the lumen and coupled to the support and a self-expanding retainer coupled to the outer wall. The retainer can have a structural braid configured to form a first annular flange on the outer wall of the support, and an occlusive braid configured to reduce blood flow through the retainer.
摘要:
An apparatus for treating vascular aneurysms includes an occlusive support device comprised of one or more support members. The occlusive device has, an end cap member and an anchoring member. The end cap member is comprised of at least one of one or more of the support members. The end cap member has openings and the end cap member comprises a reactive material that is configured to hydrate upon delivery of the device and to reduce the size of said openings. The device is configured so that the occlusive members can be positioned in the blood vessel proximate the neck of a vascular aneurysm, the reactive material hydrates and increases the resistance to blood flow into the aneurysm, and the anchoring member anchors the device in the blood vessel without occluding flow through the blood vessel.