초록 ▼

This is a catheter having a shaft, the layers of which are coextruded in an intermittently changing pattern that produces particular mechanical and frictional properties in the structure. The outer layer of the catheter shaft is comprised of a material which has greater flexibility than the material

This is a catheter having a shaft, the layers of which are coextruded in an intermittently changing pattern that produces particular mechanical and frictional properties in the structure. The outer layer of the catheter shaft is comprised of a material which has greater flexibility than the material which comprises the inner layer of the catheter shaft. The stiffer material which comprises the inner layer has frictional properties which facilitate guidewire passage and control. The invention includes the substituent shaft per se and a method of making the shaft.

대표청구항 ▼

[ We claim as our invention:] [1.] A catheter in the form of an elongate tubular member, comprising:a. a proximal portion and a distal portion adjacent to said proximal portion;b. a longitudinal axis extending through said portions;c. a continuous polymeric outer layer extending between a proximal e

[ We claim as our invention:] [1.] A catheter in the form of an elongate tubular member, comprising:a. a proximal portion and a distal portion adjacent to said proximal portion;b. a longitudinal axis extending through said portions;c. a continuous polymeric outer layer extending between a proximal end of said proximal portion and a distal end of said distal portion, said continuous outer layer having a proximal portion outer diameter and a distal portion outer diameter wherein said distal portion outer diameter is substantially constant along the length of said distal portion and is smaller than said proximal portion outer diameter;d. a continuous polymeric inner layer extending between the proximal end of said proximal portion and the distal end of said distal portion, said inner layer defining an inner lumen;e. an interface between said inner and outer layers, the interface having a diameter that varies intermittently along said longitudinal axis forming at least three continuous regions of constant interfacial diameter, each of said continuous regions having a different diameter.