Dialysis catheter

摘要

A catheter assembly used for extracorporeal treatment, such as dialysis, of blood or other body fluid, includes an outer and inner catheter in a coaxial relationship. A fluid path is provided by a passageway defined between the catheters and a distal end of the outer catheter, and another fluid path is provided through a lumen and a distal end of the inner catheter. A sealing member is coupled to one of the catheters. The member in a first position is configured to permit the distal ends of the catheters to transport fluid, while in a second position the member is configured to inhibit at least one of the distal ends from transporting fluid. The sealing member may include a flared portion for enhance sealing. The sealing member may also have a portion extending outward from the catheters to position the distal ends away from vessel contact.

主权项

1. A catheter assembly for use in the extracorporeal treatment of a body fluid, comprising:
an outer tubular member having a passageway extending therethrough and a distal end opening; an inner tubular member having a lumen extending therethrough and a distal end opening together defining a first passage of fluid in a first direction, the inner tubular member situated within the passageway of the outer tubular member to define an annular lumen therebetween, the annular lumen and the distal end opening of the outer tubular member defining a second passage of fluid in a second direction, opposite the first direction; and a collapsible sealing structure comprising a flared portion having a wall made of a resilient material such that the flared portion is resiliently biased toward an open configuration, the flared portion coupled to the inner tubular member and axially movable between a first position and a second position, where, in the first position, the flared portion is axially extended from the outer tubular member to protect and facilitate fluid flow through the distal end openings of the respective inner and outer tubular members, and where, in the second position, the flared portion is collapsed to form a seal at both of the distal end openings of the respective inner and outer tubular members to inhibit fluid flow therethrough, the wall of the flared portion having a thickness such that the flared portion, when in the second position, seals the lumen by contact between portions of the flared portion.