Systems and methods for reducing pressure at an outflow of a duct
Various systems and methods are provided for reducing pressure at an outflow of a duct such as the thoracic duct or the lymphatic duct. A catheter system can include a catheter shaft configured to be at least partially implantable within a patient's vein, a flexible membrane attached to the catheter shaft, the flexible membrane being a collapsible, tube-like member having a lumen extending therethrough, and a single selectively deployable restriction member formed over a portion of the flexible membrane at substantially a midpoint between a proximal end of the flexible membrane and a distal end of the flexible membrane, the restriction member being configured to control a size of the lumen so as to direct a controlled volume of fluid from an upstream side of the restriction member to a downstream side the restriction member.
1. A catheter system comprising:
a catheter shaft configured to be at least partially implanted within a blood vessel of a patient;
an impeller assembly disposed at a distal portion of the catheter shaft;
and
a selectively deployable restrictor attached to the distal portion, wherein when deployed, at least a portion of the restrictor defines a tapered lumen that directs fluid into the impeller assembly.
2. The system of claim 1 , further comprising at least one inflation lumen extending at least partially through the catheter shaft, the at least one inflation lumen being in fluid communication with the restrictor.
3. The system of claim 2 , wherein the restrictor comprises a selectively expandable balloon.
4. The system of claim 1 , wherein inflation of the restrictor controls the size of the tapered lumen.
5. The system of claim 1 , wherein at least a portion of the tapered lumen has a diameter from about 1 mm to about 4 mm when the restrictor is in an expanded configuration.
6. The system of claim 1 , wherein a diameter of the catheter shaft is from about 9 Fr to about 15 Fr.
7. The system of claim 1 , wherein the blood vessel is one of an internal jugular vein, a subclavian vein, or an innominate vein.
8. The device of claim 1 , wherein the impeller housing comprises one or more windows along a distal portion thereof.
9. The device of claim 1 , wherein when the distal portion is in the blood vessel and the restrictor is deployed and the impeller is driven, the impeller draws blood through the tapered lumen.
10. The device of claim 1 , further comprising an atraumatic tip extending distally of the impeller housing.
11. The device of claim 1 , further comprising a driveshaft extending at least partially through the catheter shaft.
12. The device of claim 1 , further comprising a proximal assembly, the proximal assembly comprising a sheath through which the catheter shaft is slideably disposed.
13. The device of claim 12 , wherein the sheath comprises a second restrictor.
14. A method of reducing pressure at an outflow of a duct, the method comprising:
positioning, in a blood vessel near an output of a duct, a device comprising a deployable restrictor that, when deployed, defines a tapered lumen;
deploying the restrictor; and
pumping blood through the tapered lumen into an impeller assembly to thereby lower pressure near the output of the duct.
15. The method of claim 14 , wherein the restrictor occludes the blood vessel but for the opening therethrough.
16. The method of claim 15 , wherein the vessel is a jugular vein or a subclavian vein.
17. The method of claim 14 , wherein the impeller assembly houses an impeller, the device further comprising an elongate driveshaft extending proximally from the impeller, wherein the blood flows out of the housing member via one or more aperture along the side of the impeller assembly.
18. The method of claim 17 , wherein the restrictor comprises an inflatable balloon and the method further comprises inflating the balloon when the device is positioned in the body lumen.
19. System of claim 1 , wherein, when the restrictor is deployed, a second portion of the restrictor is not tapered.