Self-tensioning vascular occlusion device and method for its use
The present invention advantageously provides self-tensioning occlusion devices, systems, and methods for percutaneous access and closure of vascular puncture sites. One device includes a catheter body, an occlusion member, and a tensioning member. The occlusion member, such an expansible member, is disposed on a distal end of the body. The tensioning member, such as a spring or coil, is slidably disposed over the body and proximal the expansion member. Generally, during application, the tensioning member will be deployed against subcutaneous tissue so as to apply tension to the expansible member against the puncture site. The substantial hold once the tension is applied is then provided by an external element, such as an anchoring clip.
1. A system for hemostasis of a puncture site in a body lumen, the system comprising:
a catheter comprising: (i) a catheter body having a proximal end, a distal end, and at least one axial lumen therethrough; (ii) an occlusion member capable of being radially expanded and contracted at the distal end of the catheter body; (iii) a helical coil spring having a central passage which receives the catheter body and having a distal end fixedly attached to the distal end of the catheter body and a proximal end having a user grip which allows the user to pull proximally on the coil spring to tension the occlusion member against the puncture site; and (iv) an axial member slideably disposed in the axial lumen of the catheter body to selectively radially expand and contract the occlusion member; and
an external clip coupleable to the proximal end of the coil spring to engage a skin surface in order to hold said proximal end in place over the tissue tract.
2. The system of claim 1 , further comprising a sheath disposable at least partially over the catheter body.
3. The system of claim 2 , wherein a diameter of the coil spring in a relaxed state is smaller than an inner diameter of the sheath.
4. The system of claim 1 , further comprising a dilator coupleable to the catheter body, wherein said dilator provides a transition region for advancing the sheath over the catheter body while the catheter is present in a body lumen or tract.
5. The system of claim 4 , wherein the dilator is integrally formed with the catheter body so as to form a single component.
6. The system of claim 4 , wherein the dilator has a leading edge, a trailing edge, and a landing therebetween.
7. The system of claim 4 , wherein the dilator has a length in a range from about 0.25 inch to about 1.0 inch.
8. The system of claim 7 , wherein the dilator has an axial slit along a length thereof.
9. The system of claim 4 , wherein the dilator has a length in a range from about 0.25 inch to about 10 inches.