Apparatus and methods for removing obstructive material from body lumens
A method for removing material within a body lumen of a patient is disclosed. The method include introducing a distal end of a tubular member into a body lumen. The tubular member has a guide member extending distally from the distal end. Next, the tubular member is positioned such that the distal end is disposed adjacent material to be removed and a distal tip of the guide member is disposed beyond the material. One or more lumen clearing elements are then deployed from the distal tip of the guide member. Each lumen clearing element includes an expandable structure that expands from a contracted condition within the guide member to an expanded condition when deployed from the distal tip. Then, the deployed one or more lumen clearing elements are retracted along a track of the guide member to engage the material disposed adjacent the distal end of the tubular member and draw the material into a lumen of the tubular member.
1. A method for removing material within a body lumen of a patient, the method comprising:
introducing a distal end of a tubular member into the body lumen, the tubular member having a guide member extending distally from the distal end;
positioning the tubular member such that the distal end is disposed adjacent material to be removed and a distal tip of the guide member is disposed beyond the material;
deploying one or more lumen clearing elements from the distal tip of the guide member, each lumen clearing element comprising an expandable structure that expands from a contracted condition within the guide member to an expanded condition when deployed from the distal tip; and
retracting the deployed one or more lumen clearing elements along a track of the guide member to engage the material disposed adjacent the distal end of the tubular member and draw the material into a lumen of the tubular member.
2. The method of claim 1 , further comprising aspirating the material drawn into the lumen of the tubular member to remove the material from the body lumen.
3. The method of claim 1 , wherein aspirating the material drawn into the lumen of the tubular member to remove the material from the body lumen comprises applying a vacuum pressure to the lumen of the tubular member to draw the material.
4. The method of claim 3 , further comprising reciprocating a cutting head axially to macerate material drawn to the distal end of the tubular member to break the material into pieces sufficiently small to be aspirated into the lumen of the tubular member by the vacuum pressure.
5. The method of claim 1 , wherein, while the deployed one or more lumen clearing elements are retracted, the expandable structure is directed into the tubular member lumen and compressed towards the contracted condition.
6. The method of claim 5 , wherein the material engaged by the lumen clearing elements is separated into multiple pieces as the expandable structure is directed into the tubular member lumen and compressed towards the contracted condition.
7. The method of claim 1 , wherein retracting the deployed one or more lumen clearing elements along the track of the guide member comprises retracting the one or more lumen clearing elements through an orifice into the guide member to compress and draw the one or more lumen clearing elements into the guide member.
8. The method of claim 7 , further comprising redeploying the one or more lumen clearing elements from the distal tip of the guide member after retracting the one or more lumen clearing elements through the orifice into the guide member.
9. The method of claim 1 , wherein the expandable structure comprises a hoop that extends substantially across the body lumen in the expanded condition when deployed from the distal tip.
10. The method of claim 9 , wherein the expandable structure further comprises a flexible arm coupled to the hoop, the flexible arm sliding along the track when the deployed one or more lumen clearing elements are retracted along the track.
11. The method of claim 1 , wherein the one or more lumen clearing elements comprise a plurality of expandable structures spaced apart from one another such that the expandable structures are deployed successively from the distal tip of the guide member.
12. The method of claim 1 , wherein the expandable structure is aligned axially within the guide member in the contracted condition, and wherein the expandable structure resiliently extends transversely relative to the guide member when deployed in the expanded condition.