REINFORCED CATHETER WITH A FORMABLE DISTAL TIP

摘要

This is a section of a catheter which self-forms a selected shape upon application of a modest amount of heat and retains that shape upon cooling and, indeed, upon any reheating. The catheter section includes in its wall a forming member which typically comprises a super-elastic alloy woven braid or at least one coil. The forming member may include other materials and components in addition to the super-elastic element of the forming member. The forming member is typically covered by at least an outer polymeric covering which holds the forming member in a first shape prior to the heating step. Upon softening of the outer layer during that heating step, the forming member self-forms into the desired second shape. The catheter section may be used either in its first shape or its second shape or in any transitional shape between the two. Often the inner lumen of the forming member may contain a second polymeric tubing member. The inner polymeric tubing member is often lubricious. The catheter sections made according to this invention may be used alone or in conjunction with other catheter sections. The more proximal sections of a catheter assembly using this concept are often substantially stiffer.