60 results about "Venous valve" patented technology

A venous valve with a frame and a cover on the frame for unidirectional flow of a liquid through the valve.

A venous valve prosthesis includes a hollow conduit (40) defining a central passageway through which blood may flow. Opposing, pliable leaflet members (30) are located within the conduit and move back and forth between a first, open position, whereby blood may flow through the central passageway in a first direction, and a second, closed position, whereby blood is prevented from backflowing through the central passageway in a second direction which is opposite the first direction. A hollow and generally cylindrical support member (10, 20) retains the leaflet members and is coaxially disposed within the conduit. The support member includes opposing cutaway regions (18) defining two axially extending struts (16) supporting the leaflet members. The cutaway regions, in cooperation with the struts, allow the leaflet members to collapse inwardly to the closed position.

Percutaneous methods and apparatus for forming a venous valve from autologous tissue by creating at least one subintimal longitudinal dissection that forms at least one flap of intimal tissue are disclosed. In one method, a balloon catheter having a dissecting blade mounted thereon is delivered to a target site where a new venous valve is to be created. The balloon is inflated to deploy the blade against the vein wall, and the catheter is longitudinally translated such that the blade dissects a subintimal layer of the vein wall. The balloon is subsequently deflated such that the blade pulls a flap of the dissected tissue towards the vein lumen, thereby creating a leaflet and corresponding pocket / sinus in the vein that collectively act as a monocuspid venous valve. Methods of forming new bicuspid and tricuspid venous valves utilizing two or three dissecting blades mounted on the balloon are also disclosed.

Methods and systems for improving the competency of a venous valve wherein one or more compressor(s) (e.g., space occupying material(s) or implantable device(s)) is / are delivered to one or more location(s) adjacent to a venous valve to compress the venous valve in a manner that causes one or both leaflets of the valve to move toward the other, thereby improving closure or coaptation of the valve leaflets. The compressor(s) may be delivered by an open surgical approach, by a direct percutaneous approach or by a transluminal catheter-based approach.

The invention relates to a thrombus treatment platform. The thrombus treatment platform comprises a suction catheter with a suction channel, a suction pump communicated with the near end of the suction catheter, a stirring device and a filter screen assembly, and the filter screen assembly comprises a filter rod and a filter screen; the stirring device comprises a first catheter, a second catheter slidably arranged outside the first catheter in a sleeving mode, a stirrer arranged at the far end of the first catheter and having an open state and a closed state, and an operating device arranged between the first catheter and the second catheter and capable of relatively sliding the first catheter and the second catheter so as to enable the stirrer to be switched between the open state and the closed state; and the thrombus treatment platform further comprises a driving device which is connected with the first catheter or the second catheter and can drive the stirrer to rotate. The thrombus treatment platform can remove thrombus while ensuring relative safety, and is especially suitable for removing a large number of thrombus in inferior vena cava, protecting venous valve and venous vessel wall, has controllable blood loss and simple operation steps, shortens operation time and reduces hospitalization cost of patients.