| 摘要 |
A self-sealing catheter for use in non-conformable tissue is provided. In an embodiment, the catheter includes a tube with an expandable portion that comprises nitinol. Upon an increase in temperature, the expandable portion of the tube expands to conform to the surrounding non-conformable tissue such that the expandable portion in the expanded state provides a seal between an exterior of the catheter and the non-conformable tissue. In a specific embodiment, the nitinol is embedded in the wall of the expandable portion of the tube in a braided mesh configuration, and provides a radial force that substantially prevents the expandable portion of the tube from collapsing when bent. Additionally, the catheter can include one or more radiopaque markers to assist in X-ray guided placement of the catheter in a patient's tissue. In another embodiment, the catheter includes an expandable coating surrounding the expandable portion of the tube, wherein the expandable coating comprises a hydrogel polymer. Upon an increase in temperature, the expandable coating expands to conform to the surrounding non-conformable tissue such that the expandable coating in the expanded state provides a seal between an exterior of the catheter and the non-conformable tissue.
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