Double-lumen infusion catheter with infusion lumen widened along intermediate section thereof

Abstract

Double-lumen infusion catheter including: a shaft having proximal section, distal section, and intermediate section therebetween; first and second lumens extending along a length of the shaft and having arc shaped wall therebetween; and an inflatable member provided distally to intermediate section, and over the distal section. First lumen has cross section larger than cross section of second lumen and is configured to receive a guidewire therethrough and allow fluid flow via an unobstructed portion of first lumen. Unobstructed portion is formed along guidewire outer surface, between guidewire outer surface and inner wall of first lumen, and extends from an inlet at proximal end of intermediate section to an outlet at distal end of intermediate section. First lumen is narrowed to approximate a first diameter in shaft proximal and distal sections, and is widened to approximate a second diameter greater than first diameter in the shaft intermediate section.

1 - 14 . (canceled) 
     
     
         15 . A double-lumen infusion catheter comprising:
 a shaft including an outer wall and an inner wall defining a first lumen and a second lumen;   a proximal guidewire opening in communication with the first lumen configured to receive a guidewire;   a proximal infusion opening in fluid communication with the first lumen, wherein the first lumen is configured to receive a guidewire from the guidewire opening therethrough and to allow fluid from the proximal infusion opening to flow along the guidewire;   a distal infusion opening in fluid communication with the first lumen configured to output the fluid to flow at first flow rate;   a distal guidewire opening in fluid communication with the first lumen, the distal guidewire opening configured to output the fluid to flow at a second flow rate that is lower than the first flow rate;   an inflatable member disposed at a distal section of the shaft, the inflatable member in fluid communication with a distal end portion of the second lumen; and   an inflation opening in fluid communication with a proximal end portion of the second lumen.   
     
     
         16 . The double-lumen infusion catheter according to  claim 15 , wherein the first lumen includes a distal wall segment adjacent the distal guidewire opening having a textured surface configured to build a pressure gradient of the fluid passing through the distal guidewire opening. 
     
     
         17 . The double-lumen infusion catheter according to  claim 15 , wherein the distal infusion opening is disposed on the shaft between the proximal infusion opening and the distal guidewire opening. 
     
     
         18 . The double-lumen infusion catheter according to  claim 15 , wherein the distal guidewire opening is configured to passthrough the guidewire. 
     
     
         19 . The double-lumen infusion catheter according to  claim 15 , wherein the first lumen includes a proximal wall segment adjacent the proximal guidewire opening having a textured surface configured to build a pressure gradient of the fluid passing through the proximal guidewire opening. 
     
     
         20 . The double-lumen infusion catheter according to  claim 16 , wherein the proximal guidewire opening is configured to output the fluid to flow at a third flow rate that is lower than the first flow rate. 
     
     
         21 . The double-lumen infusion catheter according to  claim 16 , wherein the shaft includes a proximal section, a distal section, and an intermediate section between the proximal section and distal section. 
     
     
         22 . The double-lumen infusion catheter according to  claim 21 , wherein the first lumen is narrowed to a first diameter at the proximal section and along an entire length of the distal section. 
     
     
         23 . The double-lumen infusion catheter according to  claim 22 , wherein the first lumen is narrowed to the first diameter along an entire length of the distal section. 
     
     
         24 . The double-lumen infusion catheter according to  claim 23 , wherein the first lumen is widened to a second diameter greater than the first diameter in the intermediate section. 
     
     
         25 . A double-lumen infusion catheter comprising:
 a shaft including an outer wall and an inner wall defining a first lumen and a second lumen;   a proximal guidewire opening in communication with the first lumen configured to receive a guidewire;   a proximal infusion opening in fluid communication with the first lumen, wherein the first lumen is configured to receive a guidewire from the guidewire opening therethrough and to allow fluid from the proximal infusion opening to flow along the guidewire;   a proximal guidewire opening seal configured block the fluid from flowing proximally of the proximal guidewire opening;   a distal infusion opening in fluid communication with the first lumen;   a distal guidewire opening in fluid communication with the first lumen;   an inflatable member disposed at a distal section of the shaft, the inflatable member in fluid communication with a distal end portion of the second lumen; and   an inflation opening in fluid communication with a proximal end portion of the second lumen.   
     
     
         26 . The double-lumen infusion catheter according to  claim 25 , wherein the proximal guidewire opening seal is an inflatable seal disposed adjacent and in fluid communication with the proximal infusion opening. 
     
     
         27 . The double-lumen infusion catheter according to  claim 26 , wherein the inflatable seal includes a seal inlet configured to receive the fluid entering the proximal infusion thereby inflating the inflatable seal. 
     
     
         28 . The double-lumen infusion catheter according to  claim 25 , further comprising:
 a distal guidewire opening seal configured block the fluid from flowing distally the distal guidewire opening.   
     
     
         29 . The double-lumen infusion catheter according to  claim 28 , wherein the distal guidewire opening seal is an inflatable seal disposed adjacent and in fluid communication with the distal infusion opening. 
     
     
         30 . The double-lumen infusion catheter according to  claim 29 , wherein the inflatable seal includes a seal inlet configured to receive the fluid entering the distal infusion thereby inflating the inflatable seal.