52results about How to "Improve kink resistance" patented technology

This invention is a system for the treatment of body passageways; in particular, vessels with vascular disease. The system includes an endovascular graft with a low-profile delivery configuration and a deployed configuration in which it conforms to the morphology of the vessel or body passageway to be treated as well as various connector members and stents. The graft is made from an inflatable graft body section and may be bifurcated. One or more inflatable cuffs may be disposed at either end of the graft body section. At least one inflatable channel is disposed between and in fluid communication with the inflatable cuffs.

An improved system and method for placing implantable medical devices (IMDs) such as leads within the coronary sinus and branch veins is disclosed. In one embodiment, a slittable delivery sheath and a method of using the sheath are provided. The sheath includes a slittable hub, and a substantially straight body defining an inner lumen. The body comprises a shaft section and a distal section that is distal to, and softer than, the shaft section. A slittable braid extends adjacent to at least a portion of one of the shaft section and the distal section. In one embodiment of the invention, the sheath further includes a transition section that is distal to the shaft section, and proximal to the distal section. The transition section is softer than the shaft section, but stiffer than the distal section.

An intracorporeal device, such as an endovascular graft, having a tubular section with circumferential or helical radial support members. The radial support members may be inflatable channels which support the tubular structure of the graft and which are appropriately sized and longitudinally spaced to prevent or reduce kinking of the tubular structure upon bending of the tubular structure.

A hand held dispenser system with associated dispensed material supply assembly as in separate source chemical foam precursor feeding into, for example, streamlined chemical passageways preferably each comprised of, in series, a castellated swivel hose filter, a valve assembly housing, a wing extensions of a manifold, which manifold supports a high efficiency drive system and is supported by a handle that provides for a compact assembly and receives a rugged trigger assembly. The manifold design provides for elongated filter and, temperature controlled cartridge heater insertion. There is further provided in a preferred embodiment a readily releasable electric source feed line plug connection at the butt end of the dispenser. The dispenser is well suited for the dispensing of methane foam as in a product packaging setting.

A spiral cut transition member is disclosed for controlling the transition in stiffness of a catheter from a stiffer more pushable proximal section to a more flexible and trackable distal section and increasing kink resistance. The transition member has a spiral cut provided therein to vary the flexibility of the transition member over its length. The pitch of the spiral cut can be varied to facilitate a gradual transition in flexibility along the catheter. The transition member may be used in conjunction with any type of catheter including single-operator-exchange type catheters, over-the wire type catheters, and / or fixed-wire type catheters.

An improved system and method for placing implantable medical devices (IMDs) such as leads within the coronary sinus and branch veins is disclosed. In one embodiment, a slittable delivery sheath and a method of using the sheath are provided. The sheath includes a slittable hub, and a substantially straight body defining an inner lumen. The body comprises a shaft section and a distal section that is distal to, and softer than, the shaft section. A slittable braid extends adjacent to at least a portion of one of the shaft section and the distal section. In one embodiment of the invention, the sheath further includes a transition section that is distal to the shaft section, and proximal to the distal section. The transition section is softer than the shaft section, but stiffer than the distal section.

A guidewire for medical use such as in vascular and nonvascular systems. The guidewire made from a titanium molybdenum alloy wire with a composition of approximately 78% titanium 11.5% molybdenum 6% zirconium and 4.5% tin by weight such that it is softer than stainless steel guidewires and stiffer than NiTi alloy guidewires. The distal end of the guidewire is of a smaller diameter and softer than the proximal end and fitted with a coil for springiness such that the distal end will bend when encountering curves in the body passageways. The distal tip may be heat treated for a gradient of softness with the distal tip being the softest. The distal end may also be tapered to provide an additional gradient of softness. A distal tip on the distal end of the guidewire protects the wall of the passageway from being punctured as the guidewire travels through the passageway. The resulting guidewire has properties between those of stainless steel guidewires and NiTi alloy guidewires for better torsion and stiffness characteristics.

An enhanced flexibility catheter shaft having an elongate flexible body with a proximal end, a distal end, and at least one lumen extending therethrough. A distal, flexible section on the body has a ribbed or corrugated tubular membrane having at least a first reinforcement structure, such as a first helical support, on a radially exterior or interior surface of the membrane and optionally a second reinforcement structure, such as a second helical support, on the other of the radially interior or exterior surface of the membrane

The medical balloon catheter of the present invention comprises a catheter shaft composed of a distal end shaft and a proximal end shaft and a balloon on the distal end of the distal end shaft, wherein the proximal end shaft is composed of a single member and the distal end portion of the proximal end shaft is lower in rigidity than the other parts thereof. The present invention also provides a medical balloon catheter having a structure in which a tube for passing a guidewire inside thereof is arranged so as to pass inside the balloon and the balloon and tube are fused together in the vicinity of the distal end of the catheter, wherein the ratio of the outer diameter of the small-diameter portion on the distal end side of the tube to the outer diameter of the proximal end portion is no less than 0.85.

A wire used in the medical field for guiding purposes, as well as in other fields, such as in the field of orthodontics for teeth aligning purposes. The wire, when prepared for use in such applications, exhibits an innovative blend of advantageous properties, including enhanced kink resistance over stainless steel wires and enhanced stiffness over Nitinol wires, which enhance its use as a medical guidewire or stylet, and further, as an arch wire in orthodontia applications.

An enhanced flexibility catheter shaft having an elongate flexible body with a proximal end, a distal end, and at least one lumen extending therethrough. A distal, flexible section on the body has a ribbed or corrugated tubular membrane having at least a first reinforcement structure, such as a first helical support, on a radially exterior or interior surface of the membrane and optionally a second reinforcement structure, such as a second helical support, on the other of the radially interior or exterior surface of the membrane

An introducer sheath includes a tubular body configured to be percutaneously inserted into a body lumen and a hub that is connected to a proximal portion of the tubular body, wherein the tubular body contains a polyamide resin having a structural unit derived from a cyclic aliphatic hydrocarbon, and a wall thickness / inner diameter ratio of the tubular body is 1 / 14 or less, and a kink radius / outer diameter ratio of the tubular body is less than 10.

A composition-of-matter, comprising one or more plastically deformable fiber is disclosed. The plastically deformable fiber(s) comprise a first and a second composition, where the first composition comprises at least one generally nondistensible polymer and the second composition comprises at least one agent capable of modulating distensibility of the generally nondistensible polymer(s).

A tube or skeleton for a steerable catheter includes a cylindrical body structured to permit bending in at least one bending direction and to resist bending in directions transverse to the bending direction. The cylindrical body may include a laser cut metal tube, wires bent and connected to one another, or one or more coiled wires with axial support wires attached to the coil to define one or more bending directions to form bending segments. The skeleton includes axially stiff portions that resist compression when a pull wire is pulled to cause bending movement. The axially stiff portions may include a backbone, an alignment of pivot structures, connected axially extending portions of wire elements, or axially extending support wires or rods. Two or more bending portions may be provided, each with different bending directions. Complex bending shapes may be provided by arranging the segments in rotated positions along the skeleton.

A guide wire for medical use is provided with a coil spring (20) mounted on a distal end side small diameter part (11) of a core wire (10) formed of austenitic stainless steel with a tensile strength of 2600 to 3000 MPa. The coil spring (20) has a tip end side small diameter part (21), a first taper part (22), a middle diameter part (23), a second taper part (24) and a back end side large diameter part (25). A closely coiled portion (201) is formed by the tip end side small diameter part (21), first taper part (22), middle diameter part (23) and second taper part (24), and a loosely coiled portion (202) is formed by the back end side large diameter part (25). The tip end portion of the tip end side small diameter part (21), the back end portion of the second taper part (24) and the back end portion of the back end side large diameter part (25) are affixed to the outer periphery of the distal end side small diameter part (11) of the core wire (10). This guide wire is capable of passing through even constricted areas, has high flexural rigidity, and also has exceptional push-in properties, torque conveyance properties and shape stability properties.

A pressure guidewire is provided that has a proximal end and a distal end. The pressure guidewire has a proximal section a sensor housing section, and an intermediate section. The proximal section extends from the proximal end of the pressure guidewire to a distal end of the proximal section. The sensor housing section is disposed adjacent to the distal end of the pressure guidewire. The intermediate section disposed between the proximal section and the sensor housing section. The intermediate section has a proximal end separate from the proximal section. The proximal end can be coupled to the distal end of the proximal section. The pressure guidewire has a tubular body positioned within the intermediate section. A pressure sensor is positioned in the sensor housing section

Devices and methods for providing an elastically deforming guidewire tip, capable of withstanding the extreme forces of high-speed rotational atherectomy, in particular orbital motion induced by an eccentric abrasive head, are disclosed. In certain embodiments, the reformable tip comprises an inner nitinol support coil, wherein the reformable tip may be attached to a larger proximal core for improved kink resistance and support for delivering adjunctive devices. In other embodiments, an inner nitinol support coil may be wrapped with a braided coil and / or a polymer sleeve. The resulting tip is more flexible with reduced risk of perforation than known guidewire tips.

The invention provides an embolism microcatheter, which comprises a catheter seat, a de-stressed tube and a catheter body. The near end of the catheter body is connected with the catheter seat, and the far end of the catheter body is provided with a mark ring; the de-stressed tube is arranged outside the catheter body in a sleeving mode, the length of the de-stressed tube is smaller than the length of the catheter body, and the near end of the de-stressed tube is connected with the catheter seat; and the catheter body is sequentially divided into an outer layer, a woven layer, a first combinedlayer, a second combined layer and an inner layer from outside to inside, and the outer layer comprises a first near section, a second near section, a transition section and a far section which are mutually connected in sequence in the direction of the far end of the catheter body. The two sets of combined layers are additionally arranged between the inner layer and the outer layer so that the inner layer and the outer layer can be combined better, the structure is more stable, and thus the pushing property, flexibility and the passing ability of the microcatheter are improved greatly.

Systems and methods for a multi-layered peel-away sheath assembly for insertion of a blood pump including a sheath hub and a sheath body having a proximal end that is connected to the sheath hub, anda distal end. The sheath body comprises multiple layers including a reinforcing layer. The reinforcing layer improves flexibility and kink resistance of the assembly The reinforcing layer can compriseLCP, PEBAX, stainless steel, Nitinol, or Kevlar. The reinforcing layer may be a laser-cut hypotube or a braided or coiled filament. The first layer material and the third layer material are thermoplastics, including PEBAX or TPU. The reinforcing layer has at least one discontinuity, which is aligned with peel-away lines in the sheath body to allow an operator to peel-away the assembly. The peel-away lines are formed of inner, outer notches, or both. The sheath hub also includes a discontinuity to allow the sheath hub to peel-away.

Provided is a catheter capable of favorably ensuring the passability of a medical instrument into the lumen of the catheter even when the inner diameter is large in comparison to the outer diameter, or when a kink occurs. A catheter (1) having an inner layer (22) for forming the inner surface of the catheter body (2), an outer layer (23) for forming the outer surface of the catheter body (2), and a plurality of reinforcing wires (25) embedded between the inner and outer surfaces, the catheter (1) being one which satisfies formula (1), formula (2) and formula (3), given that the inner diameter of the catheter body (2) is (D1), the outer diameter thereof is (D2), the wall thickness thereof is (T1), the wall thickness of the reinforcing wires (25) of the catheter body (2) is (T2), the effective width of the reinforcing wires (25) of the catheter body (2) is (W), and the number of reinforcing wires (25) is (N). 0.050mm<=T1<=0.100mm (formula (1)) T2 / T1>=0.25 (formula (2)) 60,000<=(D1*D2*W*N) / (T12*T2)<1,000,000 (formula (3))

The invention belongs to the field of tissue engineering, and particularly relates to a high-compliance tissue engineering blood vessel preparation template. The high-compliance tissue engineering blood vessel preparation template comprises a framework main body (1) and an inner core (2), wherein the inner core (2) is arranged inside the framework main body (1); the outer diameter of the inner core (2) is matched with the inner diameter of the framework main body (1); the main body of the framework main body (1) comprises support layers (11) and degradation layers (12) in alternate arrangement; the inner surface and the outer surface of the framework main body are the support layers (11); and the degradation layers (12) are made of degradable materials. The high-compliance tissue engineering blood vessel preparation template is used for being implanted under the skin of an animal or being used for in-vitro tissue culture; then, the inner core (2) is pulled away; and after the decellularization treatment, the high-compliance tissue engineering blood vessel can be prepared. The high-compliance tissue engineering blood vessel preparation template has the beneficial effects that the tissue engineering blood vessel prepared by using the high-compliance tissue engineering blood vessel preparation template has good compliance; the intimal hyperplasia can be inhibited.

A vehicle fuel hose resistant to high pressure and low in permeability is sequentially composed of a chloroprene rubber layer, a framework material layer, a chlorinated polyethylene rubber layer and a composite coating. The framework material layer is made of polyester fibers and steel wires. The composite coating is made of triisobutyl aluminum, vinyl silicone oil, polyimide, bentonite and silicon dioxide particles. The raw material of the composite coating is composed of, by weight, the triisobutyl aluminum of 5-10 parts, the vinyl silicone oil of 3-6 parts, the polyimide of 1-4 parts, the bentonite of 3-5 parts and the silicon dioxide particles of 8-15 parts. According to the hose, the framework material layer effectively improves the flexibility and the torsion resistance of the vehicle fuel hose, and the hose can be restored in shape after being subjected to high pressure; the granularity of the nano-meter silicon dioxide particles is basically uniform, so that the hose is low in permeability to liquid. Thus, the vehicle fuel hose can be widely applied to the vehicle field and has high practical value and economic value.

The invention discloses a low-cost eco-friendly polyester film for twist packaging and a preparation method of the polyester film. The film comprises an upper and lower surface layers and a core layer. The core layer is composed of 20-30% of bright polyester chips and 70-80% of recovery chips. Each of the upper and lower surface layers is composed of 70% of bright polyester chips and 30% of silicon-contained chips. The core layer adopts PET recovery chips which are low in price and are clean. Meanwhile, longitudinal and transverse stretch technology is used for adjustment. Mainly, the longitudinal stretch ratio is reduced to 2.8-3.2, and the transverse stretch ratio is reduced to 3.5-3.7. A special low-temperature setting process is carried out at 80-120 DEG C to further reduce crystallization tendency of the film, so that the degree of crystallinity of the film can be controlled and the twist ability of the film is improved. A twist film having a resilience angle less than 45 degrees when rotated at 540 degrees, and the cost is reduced by about 40%.

An improved system and method for placing implantable medical devices (IMDs) such as leads within the coronary sinus and branch veins is disclosed. In one embodiment, a slittable delivery sheath and a method of using the sheath are provided. The sheath includes a slittable hub, and a substantially straight body defining an inner lumen. The body comprises a shaft section and a distal section that is distal to, and softer than, the shaft section. A slittable braid extends adjacent to at least a portion of one of the shaft section and the distal section. In one embodiment of the invention, the sheath further includes a transition section that is distal to the shaft section, and proximal to the distal section. The transition section is softer than the shaft section, but stiffer than the distal section.

A flow diverter device is used to redirect the blood flow inside the cerebral blood vessels and for the reduction of blood flow to the aneurysm, hence preventing the chance of aneurysm rupture as well as promoting the healing of the aneurysm. The novel design of the device, using a set of thicker wires, provides high kink resistance and radial strength. Two patterns of inter-braiding the thicker set of wires with the finer braid are disclosed, one having a checker-board and the other a ring structure. Both patterns are highly kink resistant with the checker-board design providing minimal loss in flexibility, whereas the ring design provides greater radial strength. The device could be made of super elastic materials like Nitinol wires with the thicker set being radio opaque. The device is highly kink resistant and sufficiently flexible for use in vasculature with complex bends.