摘要:
A medical device includes a polymer scaffold crimped to a catheter having an expansion balloon. A sheath pair is placed over the crimped scaffold after crimping to reduce recoil of the crimped polymer scaffold and maintain scaffold-balloon engagement relied on to hold the scaffold to the balloon when the scaffold is being delivered to a target in a body. The sheath pair is removed by a health professional before placing the scaffold within the body.
摘要:
A medical device includes a polymer scaffold crimped to a catheter having an expansion balloon. A sheath pair is placed over the crimped scaffold after crimping to reduce recoil of the crimped polymer scaffold and maintain scaffold-balloon engagement relied on to hold the scaffold to the balloon when the scaffold is being delivered to a target in a body. The sheath pair is removed by a health professional before placing the scaffold within the body.
摘要:
A system for delivering a contrast medium to a treatment site including a delivery device, and a portable power injector. The delivery device includes a guidewire lumen and a contrast injection lumen, the guidewire lumen and contrast injection lumen being at least partially coaxial. The portable power injector includes an injector body and is configured to contain a contrast medium. The injector body has a plunger disposed therein. The portable power injector also includes a pressure generator, the pressure generator being configured to apply a pressure to the plunger to drive the contrast medium from the injector body and through a distal end of the contrast injection lumen.
摘要:
A catheter tip for attachment with an intravascular balloon catheter that is used within a body lumen is disclosed. The catheter tip includes a body portion having a base that is attached to the balloon catheter. The base defines a proximal end of the catheter tip. A head that is attached to the body portion defines a distal end of the catheter tip. An axial cavity, cooperatively defined by the body portion and the head, extends longitudinally from the proximal to the distal end of the catheter tip. The axial cavity receives a first guidewire along which the catheter is moved within the body lumen. An outer surface of the head is shaped in a predetermined manner to control the magnitude of deflection of a second guidewire that is often twisted about the first guidewire in the lumen so as to prevent catheter obstruction by the guidewires during catheter procedures.
摘要:
An endoprosthesis for delivery in a body lumen can be configured to inhibit crack formation and/or crack propagation, and/or fatigue-induced catastrophic failure by the use of holes extending through an endoprosthetic element. As such, the endoprosthesis can include at least one strut element having a strut width and a strut thickness, the strut thickness being defined by a first side opposite a second side. The element can be characterized by having a plurality of holes extending from the first side to the second side. The plurality of holes can be arranged in an amount, distribution, and/or pattern so as to inhibit crack propagation across the strut length or strut width.
摘要:
Endoprosthesis, such as a stent, includes at least one annular element defined by a first set of strut members interconnected to define apices proximate opposite sides of the annular element. The annular element further includes a foot extension extending between at least one pair of circumferentially-adjacent strut members. The foot extension has first and second foot portions extending circumferentially from corresponding ends of the circumferentially-adjacent strut members, and are contoured to provide at least two areas of flexure. The first and second foot portions are joined at a toe portion of the foot extension, and define a circumferentially-directed apex between the pair of circumferentially-adjacent strut members. Preferably, at least one or more additional annular elements, each defined by interconnected strut members, are provided. The annular elements are generally expandable between a delivery configuration and a deployed configuration. The annular elements are longitudinally aligned and connected at connection locations with connectors, wherein at least one of the connectors is constructed of a bio-absorbable material.
摘要:
A dilatation balloon is fabricated according to a process that forms cavities and indentations in the balloon and/or catheter sections. A length of tubing is axially elongated and radially expanded in a form to provide the requisite biaxial orientation and strength. Then, an excimer laser or another type of laser or mechanical material removal tool is used to remove the polymeric material, virtually without thermal effects. Cavities in the sleeve sections of the balloon are defined and if desired, indentations in the cone sections are defined. Material removal, particularly near the balloon sleeves enables a thinner, more flexible bonding area between the catheter shaft and the balloon. Further, the indentations along the cone sections enables tighter wrapping of the balloon for a reduced delivery profile. Rigidity near the sleeves is reduced for better maneuverability of the catheter in tortuous passageways.
摘要:
A stent delivery system is disclosed for delivering and deploying a radially expandable stent at a strategic orientation and location in a body vessel. The delivery system includes an elongated flexible tubular shaft sized suitably for insertion into the body vessel. A stent deployment assembly includes a distal transition portion supporting a dilator device adapted for radial expansion about a longitudinal axis of the deployment assembly from a non-expanded condition to a radially expanded condition. The dilator device is configured to support the stent thereon in the non-expanded condition and in predetermined orientation relative the deployment assembly. A rotational clutch assembly rotatably mounts the transition portion to a distal portion of the tubular shaft such that the deployment assembly is substantially torsionally isolated from the tubular shaft, about a longitudinal axis of the clutch assembly. This enables the stent deployment assembly to rotate substantially independently of the tubular shaft for strategic orientation of the dilator device during advancement through the body vessel.
摘要:
Expandable biodegradable devices formed of bistable and multistable unit cells for use in devices, such as stents and graft systems, are provided, in which the device has two or more stable configurations, including a contracted configuration and an expanded configuration, the contracted stable configuration having a smaller diameter than the expanded configuration.
摘要:
Expandable biodegradable devices formed of bistable and multistable unit cells for use in devices, such as stents and graft systems, are provided, in which the device has two or more stable configurations, including a contracted configuration and an expanded configuration, the contracted stable configuration having a smaller diameter than the expanded configuration.