摘要:
Prosthetic valves for implantation in a body vessel are provided. Prosthetic valves according to the invention comprise first and second frame members and a graft member at least partially disposed between the first and second frame members. The graft member forms a valve that permits fluid flow through the body vessel in a first direction and substantially prevents fluid flow through the body vessel in a second, opposite direction.
摘要:
Delivery systems for self-expanding devices are provided having a system proximal portion with a handle, an elongate middle section delivery device with an outer sheath and inner compression member, and a system distal portion including an outer guide channel member with first and second end portions defining a guide channel that slidably receives an inner guide channel member having a guide channel, the guide channels being substantially aligned. A mounting region for self-expanding devices is disposed radially between the inner and outer guide channel members. The outer guide channel member has a stepped profile from a first outer diameter to a second smaller outer diameter located near a transition region having a breech position opening for passage of a wire guide, catheter, or other medical instrument. The outer member is axially slideable relative to the inner member to deploy a self-expanding device. Methods of using and manufacturing are also provided.
摘要:
Medical devices with one or more bioactive agents are provided for regulating fluid flow through a body vessel. Medical devices according to the invention can comprise prosthetic valves that include a bioactive agent.
摘要:
Medical devices for implantation in a body vessel are provided. A medical device according to the invention comprises a support structure and one or more graft members comprising a valve portion and a constraining portion. The support structure has a first, unexpanded configuration and a second, expanded configuration. The constraining portion is adapted to substantially prevent the support structure from achieving the second, expanded configuration. The valve portion is adapted to permit fluid flow through a body vessel in a first direction and substantially prevent fluid flow through the vessel in a second, opposite direction.
摘要:
A venous valve prosthesis having a substantially non-expandable, valve portion comprising a valve-closing mechanism, such as a pair of opposing leaflets; and an anchoring portion, such as one or more self-expanding frames or stents that are expandable to anchor the prosthesis at the implantation site. In one embodiment, the rigid valve portion includes a deposition of material such as pyrolitic carbon to reduce the thrombogenecity of the blood-contacting surfaces. The anchoring portions preferably include a covering, such as a tubular construct of synthetic or collagen-derived material (such as a bioremodelable ECM material), which attaches about the support structure such that blood flow is directed through the valve mechanism as it transitions from the larger diameter anchoring portion to the intermediate, smaller-diameter portion of the prosthesis. In another embodiment, the valve support housing and valve-closing elements are delivered in a collapsed, folded, and/or dissembled state sized for delivery, then manipulated in situ to the second expanded configured following deployment.
摘要:
A guidewire with a flexible tip is provided. The flexible tip comprises a portion of a coating that axially extends beyond a distal end of an elongate member of the guidewire. The length of the flexible tip can be defined in relation to a diameter of the elongate member of the guidewire. Also, the length of the flexible tip can be defined in relation to a length of a distal tip portion of the elongate member of the guidewire. The flexible tip may include agents that facilitate visualization, such as an opacifying agent in the coating and/or a radiopaque marker disposed in the flexible tip.
摘要:
Prosthetic valve devices for implantation in body vessels are provided. The prosthetic valve device includes at least one flexible member that permits fluid flow in a first direction and substantially prevents fluid flow in a second. The valve device also includes an inflatable chamber at least partially attached to the flexible member. The inflatable chamber is adapted to receive inflating media and is adapted to contact the body vessel. A delivery system is also provided that includes a valve device and a delivery apparatus. The delivery apparatus includes a member adapted for filling the chamber of the valve device with inflating media. A related method of making the valve device is also provided.
摘要:
Prosthetic valves for regulating fluid flow through a body vessel are described. The valves include a valve member that includes at least a portion that is capable of moving to selectively permit and substantially prevent fluid flow through the body vessel, either alone or with one or more additional valve members. A cannula is associated with the valve and permits a controlled amount of fluid flow through the valve, such as retrograde flow while the valve member substantially prevents fluid flow through the body vessel.
摘要:
Prosthetic valves for regulating fluid flow are provided. The valves have at least one leaflet that includes a plurality of pores that allow a quantity of retrograde flow to pass through the leaflet when the valve is in a closed configuration.
摘要:
Described are vascular valve devices having valve elements formed of flexible material and at least one removable frame element. Also described are methods for using such devices in the vascular system and in particular in the venous system to treat venous insufficiency.