Apparatus and methods for treating obstructions within body lumens
Apparatus and methods are provided for delivering fluid into a body lumen during a medical procedure. A distal end of an apparatus may be introduced into a body lumen, and a valve on the distal end may be opened to deliver fluid through a first lumen into the body lumen, e.g., contrast and/or other diagnostic or therapeutic agents. The valve may be closed, and a procedure may be performed within the body lumen, e.g., using a treatment element carried on the distal end. For example, the treatment element may include a balloon that may be inflated when fluid is delivered through the first lumen with the valve closed. Optionally, a prosthesis, energy source, drug platform, and the like may be carried by the balloon for treating the body lumen. In various embodiments, the valve may be located proximal or distal to the treatment element.
1. An apparatus for treating a body lumen, the apparatus comprising:
an outer member including a proximal end, a distal end sized for introduction into a body lumen, and a first lumen extending between the proximal and distal ends;
an expandable balloon comprising a proximal end secured to the outer member distal end, and a distal end comprising an outlet, the balloon comprising an interior communicating with the first lumen and the balloon outlet;
an inner member slidably disposed within the first lumen, the inner member comprising a proximal end adjacent the outer member proximal end, and a distal end within the balloon interior adjacent the balloon outlet;
a sealing member on the inner member distal end;
a handle on the outer member proximal end;
an actuator on the handle coupled to the inner member for directing the inner member between a proximal position wherein the sealing member is spaced from the outlet such that fluid introduced through the first lumen passes through the outlet into a region around the apparatus, and a distal position wherein the sealing member is received at least partially within the balloon distal end to substantially seal the outlet; and
a tensioning element coupled between a stop in the balloon distal end and the sealing member for biasing the sealing member towards the proximal position.
2. The apparatus of claim 1 , wherein the tensioning element is biased to automatically direct the inner member from the distal position to the proximal position when the actuator is released.
3. The apparatus of claim 1 , wherein the actuator is configured to overcome the bias of the tensioning element to direct the inner member from the proximal position to the distal position.
4. The apparatus of claim 1 , wherein the sealing member comprises a stop that engages the stop in the balloon distal end to limit distal advancement of the inner member in the distal position.
5. The apparatus of claim 1 , wherein the sealing member comprises a valve body sized to be received through the balloon distal end, and one or more valve seals on the valve body that slidably engage an inner surface of the balloon distal end for substantially sealing the outlet.
6. The apparatus of claim 1 , wherein the inner member has a cross-section smaller than the first lumen such that an annular lumen is defined between the inner member and the outer member for delivering fluid from the outer member proximal end into the balloon interior.
7. The apparatus of claim 1 , further comprising another tensioning element coupled between the proximal and distal ends of the balloon for biasing the balloon distal end distally.
8. The apparatus of claim 1 , further comprising a distal tip on the distal end of the inner member, the distal tip comprising a flexible curved shape.