51results 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 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.

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.

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

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.

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 medical implant is provided that has a first and a second electrospun component with the same type of biodegradable electrospun polymers. In one example, the second electrospun component is separately manufactured from the first electrospun component. Furthermore, the implant is structured such that the first electrospun component and the second electrospun component are assembled or joint together by the same type biodegradable electrospun polymers as in the first electrospun component and the second electrospun component. The assembled implant is a porous, biodegradable medical implant capable of being replaced by naturally ingrown tissue over time upon implantation. Advantages are the avoidance of sutures and the problems associated with the use of sutures, capability of ETR, avoidance of the need for extra materials, allowance for more precise and reproducible assembled structures for which the process could be automated.