System for deploying a device to a distal location across a diseased vessel
A system for deploying a device to a distal location across a diseased vessel, comprising a sheath comprising an expandable distal portion comprising a porous wall defining a lumen there-through, the distal portion having a collapsed configuration, wherein the sheath has a first cross-sectional outer diameter and a first lumen inner diameter, and an expanded configuration, wherein the sheath has a second cross-sectional outer diameter and a second lumen inner diameter; wherein in the collapsed configuration, the sheath is configured to be advanced across at least a portion of the diseased vessel to a position adjacent the distal location and wherein said system comprises a removable expansion retention member configured to retain the expandable sheath in the collapsed configuration.
1. A system for deploying a device to a distal location across a diseased vessel, comprising:
an expandable sheath comprising a distal portion comprising a porous wall defining a lumen therethrough, the expandable sheath including the distal portion having a collapsed configuration, wherein the expandable sheath has a first cross-sectional outer diameter and a first lumen inner diameter, and an expanded configuration, wherein the expandable sheath has a second cross-sectional outer diameter and a second lumen inner diameter;
a removable expansion retention member configured to retain the expandable sheath in the collapsed configuration, the removable expansion retention member comprising a corset and a tensile member assembly wherein the tensile member may be actuated to release the corset and allow expansion of the expandable sheath to the expanded configuration, the removable expansion retention member disposed on the distal portion of the expandable sheath, the collapsed configuration being contained within the removable expansion retention member, and configured to be pulled through the lumen and fully removed through a proximal assembly after releasing the expandable sheath; and
wherein in the collapsed configuration, the expandable sheath is configured to be advanced across at least a portion of the diseased vessel to a position adjacent the distal location without substantial size interference between the first cross-sectional outer diameter of the expandable sheath and an inner diameter profile of a lumen of the diseased vessel;
wherein upon positioning the collapsed configuration to the desired position adjacent to the distal location, the tensile member is actuated to release the corset and the collapsed configuration of the expandable sheath and the expandable sheath may be expanded to the expanded configuration to facilitate passage of one or more relatively large diameter structures through the lumen that are larger in diameter than the first cross-sectional outer diameter, the expanded configuration of the distal portion diverting at least a portion of the flow of blood through the diseased vessel across the porous wall of the sheath;
said porous wall being configured to be capable of preventing passage of emboli to a tributary vessel of the diseased vessel;
wherein the expandable sheath expands from the collapsed configuration to the expanded configuration; and
wherein upon completion of passage of the one or more relatively large diameter structures, the expandable sheath may be collapsed back to the collapsed configuration.
2. The system of claim 1 , wherein the first lumen inner diameter is equal to between about 0 mm and about 3 mm.
3. The system of claim 1 , wherein the second lumen inner diameter is equal to between about 20 mm and about 50 mm.
4. The system of claim 1 , further comprising one or more radiopaque markers coupled to the expandable sheath and configured to assist an operator observing fluoroscopy with positioning of the expandable sheath relative to the diseased vessel.
5. The system of claim 1 , wherein the porous wall comprises one or more holes created across a sheet like member.
6. The system of claim 5 , wherein the holes have a diameter of about 100 microns.
7. The system of claim 1 , wherein the porous wall is configured to filter blood flowing through it to prevent passage of emboli that may be present within the lumen.
8. The system of claim 1 , wherein the expandable sheath comprises one or more radiopaque markers located adjacent the porous wall and being configured to allow an operator to visualize relative positioning of the porous wall relative to one or more anatomical features using fluoroscopy.
9. The system of claim 1 , further comprising a guidewire inserted through at least a portion of the lumen and configured to assist with guidance of the expandable sheath through the diseased vessel.
10. The system of claim 1 , wherein the device comprises an implantable prosthesis selected to be passed through the expandable sheath to the distal location across the diseased vessel.
11. The system of claim 1 , wherein the relatively large diameter structure comprises a cardiac valve prosthesis.
12. The system of claim 1 , wherein the expandable sheath is configured to be twisted longitudinally to form the collapsed configuration, and untwisted longitudinally to form the expanded configuration.
13. The system of claim 1 , wherein the expandable sheath comprises a proximal portion having a stiffer structural modulus than the distal portion.
14. The system of claim 1 , wherein:
said expandable sheath comprises an expandable distal portion comprising a first non-porous region distal to said porous wall, said distal portion having a lumen therethrough, the distal portion having a collapsed configuration, wherein the distal portion has a first cross-sectional outer diameter and a first lumen inner diameter, and an expanded configuration, wherein the distal portion has a second cross-sectional outer diameter and a second lumen inner diameter.
15. The system of claim 1 , wherein:
an embolic protection component is housed in said expandable sheath and adapted to be moved distally out of said sheath;
said embolic protection component comprising a distal hoop, which is expandable and collapsible and configured to expand into contact with the inner wall of a blood vessel, said embolic protection component comprising, when moved distally and expanded, a tubular porous mesh having an open distal end and a proximal portion housed in said expandable sheath and a distal portion extending to said hoop with at least one elongated structural member supporting said mesh.
16. The system of claim 15 , wherein the embolic protection component is coupled to a manipulation element which is adapted to cause the embolic protection component to collapse.
17. The system of claim 16 , wherein said manipulation element is coupled to said hoop.
18. The system of claim 17 , wherein said manipulation element is adapted to exert tension on said hoop.
19. The system of claim 17 , wherein said distal hoop that is controllably closeable by an operator through tensioning of the manipulation element operatively coupled to the distal hoop.
20. The system of claim 16 , wherein collapse of said embolic protection component is effective to capture emboli within said mesh.