38results about How to "Increased longitudinal flexibility" patented technology

The present invention is directed to a pleated medical device assembly, preferably a pleated stent assembly, comprising a tube co-pleated with a balloon to a delivery width suitable for intraluminal delivery. Because the tube of the present invention transitions between its original diameter and its delivery diameter by folding and unfolding, rather than by radial contraction and expansion, the wall of the tube of the present invention may be substantially non-expandable, and thus may be substantially solid. The pleated stent assembly of the present invention is particularly suited for the treatment of neurovascular aneurysms.

A medical device includes a catheter and a stent mounted on the catheter, the stent having a hollow, cylindrical body made with a plurality of rings. The rings each extend circumferentially around the cylindrical body and include an undulating series of peaks and valleys. The rings are joined together by a series of links which are shaped and arranged to promote longitudinal flexibility as the stent is delivered on the catheter and effective scaffolding after deployment. In one aspect of the invention, the rings are provided with inflection points on some portions of the rings which extend in a generally circumferential direction for a short distance. A link is joined at one end at the inflection point on one ring and also joined at a second end at a second inflection point on an adjacent ring. This construction allows the crimped stent to flex longitudinally when it is subjected to bending forces such as those encountered during delivery of the stent and catheter through a tortuous coronary artery.

An expandable stent for implantation in a body lumen, such as an artery, is disclosed. The stent consists of a plurality of radially expandable cylindrical elements generally aligned on a common longitudinal stent axis and interconnected by one or more interconnecting members placed so that the stent is flexible in the longitudinal direction. The strength of the stent at a center section or at either end can be varied by increasing the mass of the struts forming each cylindrical element in that center section or end section relative to the lower mass struts in the remaining sections of the stent. Increasing the mass of the struts can be accomplished by, for a given strut thickness, increasing the width of the strut, or increasing the length of a cylindrical element.

A composite stent-graft tubular prosthesis includes an inner PTFE tubular structure, an outer PTFE tubular structure positioned about the inner PTFE tubular structure and a diametrically deformable stent interposed between the inner and outer PTFE tubular structures. The interposed stent is formed from an elongate wire helically wound with a plurality of longitudinally spaced turns into an open configuration. Each of the turns includes successive aligned upper and lower wave-like peaks. Selective ones of said upper and lower peaks are exposed exteriorly of the outer PTFE structure to render the composite prosthesis longitudinally flexible.

An expandable stent has larger cells located at the distal end of the stent than in the body portion so that a catheter balloon can more easily protrude into the cells to increase stent retention relative to the balloon. The intravascular stent has a plurality of cylindrical rings connected by links, the spacing of which is a factor in defining the cell size. The stent can be compressed or crimped onto a balloon catheter to a very low profile and maintain a high degree of stent retention due to increased spacing between rings in the region of the distal end ring.

The present invention generally relates to a medical surgical device and specifically a wire guide for percutaneous placement within a body lumen. The wire guide includes an elongated mandrel having sufficient flexibility and kink resistance and a cannula having a stiffness greater than the mandrel stiffness for sufficient pushability. The mandrel extends through the cannula and has a portion extending distal thereto to form a distal tip of the wire guide. The wire guide can further include a slotted cannula to improve the flexibility of the wire guide at the proximal portion of the wire guide. The slots can be arranged in various patterns for increased flexibility along the longitudinal length of the cannula, as well as increased circumferential flexibility along the wire guide. The mandrel may also have a proximally tapered portion to improve the flexibility of the wire guide at the proximal portion of the wire guide.

A rail stent-graft with increased longitudinal flexibility and sealing properties that is deployable within a body lumen, such as the aorta, for repairing an aneurysm. The rail stent-graft includes an anchoring assembly for securing the rail stent-graft to a portion of the vessel above a junction with another vessel.

The present invention provides an endoprosthesis comprising a radially distensible, tubular stent comprising opposed open ends and a stent wall structure having opposed exterior and luminal surfaces; and a continuous and seamless ePTFE tubular covering having a node and fibril structure securably disposed to at least one of the stent surfaces, the graft covering comprising at least two laminated layers, wherein the laminated layers include at least one region where the laminated layers are not securely bonded; and the at least one region has a different bending flexibility from the tubular graft covering.

Stent designs for use in peripheral vessels, such as the carotid arteries, are disclosed. The stents consist of a plurality of radially expandable cylindrical elements generally aligned on a common longitudinal stent axis and interconnected by one or more interconnecting members placed so that the stent is flexible in a longitudinal direction. The cylindrical elements are generally serpentine wave pattern transverse to the longitudinal axis between alternating valley portion and peak portions, the valley portion including alternating double-curved portions and U-shaped portions. The interconnecting members are attached to the double-curved portions to connect a cylindrical element to an adjacent cylindrical element and interconnecting members are attached to the U-shaped portions to connect the cylindrical element to the other adjacent cylindrical element. The designs include an eight crown and six crown stent which exhibit flexibility and sufficient radial strength to support the vessel.

An intravascular stent especially suited for implanting in curved arterial portion. The stent retains longitudinal flexibility after expansion. The stent is formed of intertwined meander patterns forming triangular cells. The cells are adapted to provide radial support, and also provide longitudinal flexibility after expansion. The cells also provide increase coverage of a vessel wall. The stent has a reduced crimped profile due to the differing lengths of adjacent structural members within the cells, resulting in loops which are not aligned around the circumference of the stent. Also, this stent may contain a second type of square cells, which are adapted predominately to minimize flaring of the stent ends and to provide additional stiffness.

The invention discloses a fatigue-resistant narrow V-belt and a production method thereof. The fatigue-resistant narrow V-belt comprises a core and wrap. The core includes an extension layer, a strong layer, a buffer layer and a compression layer. A soft toughening layer is arranged between the compression layer and the wrap. The production method includes: mixing, calendering, forming, cutting, wrapping, vulcanizing and cooling. Vulcanizing is performed at the temperature of 160-170 DEG C and under the inner pressure of 0.45-0.55MPa and the outer pressure of 1.0-1.2MPa. Compared with the prior art, the fatigue-resistant narrow V-belt has the advantages that the soft support layer is added in a body of the fatigue-resistant narrow V-belt and has small thickness and large transverse rigidity, and accordingly longitudinal toughness of the body is improved greatly and the transverse rigidity and flexing-aging resistance of the body are improved; bonding force between the soft support layer and the wrap is larger than that between the compression layer and the wrap, the inner pressure of the body can be reduced, the body is more extensible, and operating process is smoother.

A wrappable protective sleeve for providing protection to an elongate member contained therein and method of construction thereof is provided. The sleeve includes a textile wall having opposite edges extending lengthwise along a longitudinal axis between opposite ends. The edges are wrappable to overlap one another to form an enclosed cavity. At least one reinforcement rib extends along at least a portion of the wall. The at least one reinforcement rib is formed of material fused and bonded on and / or in the wall.

A machined spring for injector applications includes opposed first and second spring bases separated apart along a longitudinal axis. A spring body connects the first and second spring bases. The spring body includes a generally annular wall with a plurality of spring channels defined therethrough, such as machined channels. Exemplary applications for such machined springs include liquid strainers, valve components, and structural components for accommodating thermal expansion in injectors.

A thermal sleeve for routing and protecting elongate members and method of construction thereof are provided. The sleeve has a tubular woven wall extending along a central axis between opposite open ends with an outer reflective foil layer fixed thereto. The wall is woven with lengthwise extending warp yarns and circumferentially extending fill yarns. The fill yarns include first and second fill yarns bundled in side-by-side abutting relation as a single pick, thereby forming discrete single pick bundles in axially spaced relation from one another. The first fill yarn is provided as a standard monofilament, while the second fill yarn is provided having a low melt material melted and bonded to the abutting first fill yarn and to portions of the abutting warp yarns, wherein the spaces between the discrete bundles remain substantially free of melted material, thereby further enhancing longitudinal flexibility of the sleeve.

The present invention discloses a coronary artery vascular stent with drug carrying slots (2), comprising a plurality of main supporting unit rings (1,8) and connecting rods (4,6). Said main supporting unit rings comprise a plurality of unit waves. There are drug carrying slots (2) at the outer surface of the rods of said unit waves, characterized in that the total slot length of the drug carrying slots (2) is 60%-75% of the total wave rod length of the main supporting unit rings (1,8).

Stent designs for use in vessels, such as the carotid and coronary arteries, are disclosed. The stents consist of a plurality of radially expandable cylindrical elements generally aligned on a common longitudinal stent axis and interconnected by one or more interconnecting members placed so that the stent is flexible in a longitudinal direction. The cylindrical elements form a generally serpentine wave pattern transverse to the longitudinal axis between alternating valley portions and peak portions. The interconnecting members are attached to the double-curved portions to connect a cylindrical element to an adjacent cylindrical element and interconnecting members are attached to the inverted double-curved portions to connect the cylindrical element to the other adjacent cylindrical element. The stent designs include both a six crown and an eight crown stent which exhibit flexibility and sufficient radial strength to support the vessel.

A polymer tube is processed using a solid phase process for improving mechanical characteristics of the tube, including radial strength and stiffness. The tube is made into a scaffold possessing improved mechanical and use characteristics, such as a reduced crimped profile and improved deliverability.

An intravascular stent especially suited for implanting in curved arterial portions. The stent retains longitudinal flexibility after expansion. The stent is formed of intertwined meander patterns forming triangular cells. The triangular cells are adapted to provide radial support, and also to provide longitudinal flexibility after expansion. The triangular cells provide increased coverage of a vessel wall. The stent can have different portions adapted to optimize radial support or to optimize longitudinal flexibility. Loops in the stent are disposed and adapted to cooperate so that after expansion of said stent within a curved lumen, the stent is curved and cells on the outside of the curve open in length, but narrow in width whereas cells on the inside of the curve shorten in length but thicken in width to maintain a density of stent element area which much more constant than otherwise between the inside and the outside of the curve. As a result, when the stent is coated with a medicine the more constant density of stent elements results in an even dose being applied to the inside wall of the lumen, avoiding the possibility that a toxic dose be supplied at one area while a less than effective dose is applied to another area.

A non-compliant high strength balloon (10) includes a reinforcement member (30) formed of a sleeve of woven or braided strengthening elements (32, 34). There are provided circumferential strengthening elements (32) which are pre-tensed in order to remove any undulations within the strengthening elements (32) and to ensure that these have a precise annular size. On the other hand, the longitudinal strengthening elements (34) have undulations therein. The pre-tensing of the strengthening elements (32) ensures that the balloon will not stretch during pressurization thereof, which can occur when the circumferential strengthening elements have undulations therein, which will be natural artefacts of a weaving or braiding process. The undulations in the longitudinal strengthening elements (34) provides the balloon with increased longitudinal flexibility.

A thermal sleeve for routing and protecting elongate members and method of construction thereof are provided. The sleeve has a tubular woven wall extending along a central axis between opposite open ends with an outer reflective foil layer fixed thereto. The wall is woven with lengthwise extending warp yarns and circumferentially extending fill yarns. The fill yarns include first and second fill yarns bundled in side-by-side abutting relation as a single pick, thereby forming discrete single pick bundles in axially spaced relation from one another. The first fill yarn is provided as a standard monofilament, while the second fill yarn is provided having a low melt material melted and bonded to the abutting first fill yarn and to portions of the abutting warp yarns, wherein the spaces between the discrete bundles remain substantially free of melted material, thereby further enhancing longitudinal flexibility of the sleeve.

The present invention discloses a coronary artery vascular stent with drug carrying slots (2), comprising a plurality of main supporting unit rings (1,8) and connecting rods (4,6). Said main supporting unit rings comprise a plurality of unit waves. There are drug carrying slots (2) at the outer surface of the rods of said unit waves, characterized in that the total slot length of the drug carrying slots (2) is 60%-75% of the total wave rod length of the main supporting unit rings (1,8).

The invention discloses a uneven settlement control structure and a construction process for an open trench tunnel and relates to the field of tunnel construction. The uneven settlement control structure mainly comprises a beam foundation used for supporting a tunnel structure; the beam foundation is formed by overall pouring of expanded longitudinal beams, cross beams and a cushion board; the expanded longitudinal beams are arranged at the two sides below a tunnel; the crossbeams are longitudinally and uniformly arranged on the expanded longitudinal beams; the cushion board is arranged on thecrossbeams; the tunnel is arranged on the tunnel so that the cushion board can cooperate with the longitudinally and uniformly arranged crossbeams to receive the stress in a synergetic manner, and the uneven settlement among pipe joints of the tunnel can be controlled and reduced.

The invention relates to an adjustable toein torsion beam suspension and a forming method thereof. The suspension comprises a toein control rod and a dragging arm, wherein the toein control rod is connected to a vehicle body by a first liner and is connected with a third liner by a dragging arm; due to a small improvement on the structure of a common torsion beam, the longitudinal flexibility and the lateral steering performance of the suspension are improved considerably; and the improved suspension realizes high performance under a condition of low cost.

Apparatus and methods are provided for treating patients exhibiting symptoms of hypertension, isolated systolic hypertension, heart failure with preserved ejection fraction, May-Thuner Syndrome or dyspnea by diagnosing and reducing narrowing of a patient's iliac vein caused by extrinsic localized compression using a stent having circumferential differential radial stiffness and delivery catheter for aligning and deploying such stents.

The invention discloses a turnout support system applicable to a straddle type monorail and belongs to related technical fields of straddle monorails. A continuous rigid frame in a longitudinal direction and a plurality of support units which are arranged below the continuous rigid frame at intervals in the longitudinal direction are arranged, the continuous rigid frame is fixedly connected with apier cover beam at the top of the support units, then a rigid system with synergetic stress is formed, and a turnout system can be stably supported effectively on premise that the setup height of a support system is reduced. The turnout support system applicable to the straddle type monorail, which is disclosed by the invention, is simple in structure, simple and convenient to set, small in construction difficulty and high in construction efficiency, a straddle type monorail turnout system can be effectively and stably supported, the height of the cover beam and the overall height of the turnover system are reduced, the construction cost is reduced, great flexibility is provided for design of stations and rails of the straddle type monorail, good application prospects and popularization and application values can be made, and popularization and application of the straddle type monorail can be effectively promoted.