Catheter with changeable number of lumens

摘要: A catheter assembly is provided. An attachment structure has a proximal end portion of an outer cannula attached to it. needle insertable through the and structure. inner region The axially can comprise two hubs, one for other cannula, hubs being attachable another form overall valve associated with structure, suitably hub. normally closes communication between access passage in e.g., hub, lumen. opens sufficiently pass it open lumen when inserted allows removal insertion replacement if desired, without removing from blood vessel. Use relatively small diameter desired also be provided material such that will swell place.