Capture assembly and method
This patent document discloses assemblies and methods for removing obstructive material from a body vessel or other cavity. An assembly can include an elongate inner member, an elongate outer member, an aspirator, one or more valves, or a waste collection reservoir. Each of the elongate members can extend from a proximal end portion to a distal end portion and can include a lumen therethrough. The elongate inner member can be partially disposed in the lumen of the elongate outer member and can be moveable along its longitudinal axis relative to the elongate outer member. The aspirator can be in flow communication with the proximal end portion of the elongate inner member for drawing the obstructive material into or through its lumen. The one or more valves can be configured and positioned to allow obstructive material removed from the body vessel or cavity to be urged toward the waste collection reservoir.
1. An assembly for removing obstructive material from a body vessel or cavity, comprising:
an elongate outer member and an elongate inner member, each extending from a proximal end to a distal end and including a first lumen therethrough, wherein a maximum annular gap between an inner surface of the elongate outer member and an outer surface of the elongate inner member is 0.1 mm,
the first lumen of the elongate inner member having an aspiration entrance at the distal end of the elongate inner member and defined by a wall, the wall including a plurality of orifices adjacent and proximal to the entrance,
the elongate inner member movable along a common longitudinal axis relative to the elongate outer member such that the plurality of orifices is extendable beyond, and retractable within, the distal end of the elongate outer member to break down the obstructive material, wherein the elongate outer member does not include a wall orifice;
the elongate outer member including a second lumen positioned about its outer surface, the second lumen providing a longitudinal slot or channel adapted for a guidewire;
an aspirator in flow communication with the elongate inner member for drawing the obstructive material through the aspiration entrance of the first lumen of the elongate inner member; and
a valve manifold comprising a first port, the first port including a one-way valve in communication with the first lumen of the elongate inner member and allowing flow in a distal-to-proximal direction toward the aspirator.
2. The assembly of claim 1 , further comprising a second port within the valve manifold, the second port including a second one-way valve allowing flow in a direction away from the aspirator and toward a waste collection reservoir.
3. The assembly of claim 2 , wherein the one-way valve and second one-way valve are positioned proximal of the proximal end of the elongate inner member.
4. The assembly of claim 1 , further comprising a manipulator handle coupled to the proximal end of one or both of the elongate inner member and the elongate outer member to allow advancement and retraction of the elongate inner member relative to the elongate outer member.
5. The assembly of claim 4 , wherein the manipulator handle is configured to advance and retract the elongate inner member relative to the elongate outer member while the aspirator draws the obstructive material through the aspiration entrance of the first lumen of the elongate inner member.
6. The assembly of claim 1 , further comprising a radiopaque marker positioned adjacent to the distal end of one or both of the elongate inner member and the elongate outer member.
7. The assembly of claim 1 , wherein the first lumen of the elongate outer member tightly fits around the outer surface of the elongate inner member without gripping it and allows the elongate inner member to move relative to the elongate outer member while sealing the first lumen of the elongate outer member.
8. The assembly of claim 1 , wherein a wall of the elongate outer member includes a reinforcing layer composed of braided or wound fibers.
9. The assembly of claim 1 , wherein a longitudinal axis of the second lumen is spaced from the common longitudinal axis of the elongate inner and outer members.
10. The assembly of claim 1 , wherein the distal end of one or both of the elongate inner member and the elongate outer member includes a skived distal tip opening into its first lumen.
11. The assembly of claim 1 , wherein the plurality of orifices is radially-spaced around the wall of the elongate inner member and each orifice has an oval or elliptical shape.
12. The assembly of claim 1 , wherein the aspirator includes a syringe barrel, a plunger slidable in the syringe barrel, and a resilient means, the resilient means configured to urge the plunger toward a resting position.
13. The assembly of claim 1 , wherein the distal end of the elongate inner member is configured to extend beyond the distal end of the elongate outer member, and wherein the proximal end of the elongate inner member is configured to concurrently extend proximally of the proximal end of the elongate outer member.
14. The assembly of claim 1 , wherein the distal end of the elongate inner member is configured to be retracted into the distal end of the elongate outer member.
15. The assembly of claim 1 , wherein the elongate outer member includes a pre-curved configuration in its unbiased state.
16. The assembly of claim 1 , wherein a distal end portion of the elongate outer member includes a sleeve attached to the outer surface of the elongate outer member and forming the second lumen.
17. The assembly of claim 1 , wherein a length of the second lumen of the elongate outer member is less than a length of the first lumen of each of the elongate inner and outer members.