Systems and methods for luminal access
A luminal access system comprises an evertable, lubricious sleeve, a pusher tube, and optionally a lumen tube. The evertable, lubricious sleeve is attached to a non-evertable sheath which is coaxially received over the pusher tube. A distal portion of the evertable sleeve folds or everts into an axial passage of the pusher tube where it is connected to a lumen tube. A distal portion of the pusher tube may be bendable, typically comprising a relatively soft polymer which is circumferentially reinforced to enhance hoop strength.
1. A method for accessing a body lumen, said method comprising:
disposing an everted edge of a lubricious sleeve adjacent to an access point on the body lumen; and
distally advancing a pusher tube against a proximal side of the everted edge to distally advance the everted edge into the body lumen, wherein an outer proximal end of the sleeve is immobilized relative to the pusher tube, and wherein a lumen tube is attached to an inner distal end of the sleeve and is drawn into the body lumen by the inner distal end of the sleeve;
wherein the lubricious sleeve is positioned through an endoscope prior to advancing the pusher tube.
2. A method as in claim 1 , further comprising immobilizing the outer proximal end of the sleeve using a sheath tube secured to said outer proximal end.
3. A method as in claim 1 , wherein the pusher tube is advanced over a guidewire disposed in the body lumen.
4. A method as in claim 3 , wherein a distal portion of the pusher tube is conformable to track the guidewire and a proximal portion of the pusher tube has sufficient column strength to push the distal portion over the guidewire.
5. A method as in claim 1 , further comprising introducing or removing a material or instrument through a lumen of the lumen tube.
6. A method as in claim 1 , wherein the lubricious sleeve is initially disposed in an axial passage of the pusher tube and the pusher tube.
7. A method as in claim 6 , wherein the lubricious sleeve is withdrawn from the axial passage as the pusher tube is advanced through the natural body lumen.
8. A method as in claim 1 , wherein the natural body lumen is selected from the group consisting of a urethra, a ureter, a blood vessel, a hepatic duct, a cystic duct, a cervical canal, and a fallopian tube.
9. A method for accessing a urinary tract, said method comprising:
disposing an everted edge of a lubricious sleeve adjacent to an access point to a ureter; and
distally advancing a pusher tube against a proximal side of the everted edge to distally advance the everted edge through the ureter and into the urinary tract, wherein an outer proximal end of the sleeve is immobilized relative to the pusher tube, and wherein a lumen tube is attached to an inner distal end of the sleeve and is drawn into the body lumen by the inner distal end of the sleeve.
10. A method as in claim 9 , further comprising immobilizing the outer proximal end of the sleeve using a sheath tube secured to said outer proximal end and disposed through a urethra.
11. A method as in claim 9 , further comprising introducing or removing a material or instrument through a lumen of the lumen tube.
12. A method as in claim 9 , wherein the lubricious sleeve is positioned through a cannula passing through the urethra and into a bladder prior to advancing the pusher tube.
13. A method as in claim 12 , wherein the cannula comprises an endoscope positioned to view the access point to the ureter.
14. A method as in claim 9 , wherein the lubricious sleeve is initially disposed in an axial passage of the pusher tube and the pusher tube.
15. A method as in claim 14 , wherein the lubricious sleeve is withdrawn from the axial passage as the pusher tube is advanced through the natural body lumen.
16. A method as in claim 9 , wherein the everted edge is advanced into the upper urinary tract.
17. A method as in claim 9 , wherein the everted edge is advanced into the kidney.