Apparatus and methods for blocking needle and cannula tracts

摘要

Apparatus and methods for blocking needle tracts are disclosed. In some embodiments, the needle tracts are blocked by using a needle that includes an elongated shaft that defines an outer surface, and a polymer coating applied to the outer surface of the shaft, the coating being adapted to block the tract formed by insertion of the needle into an object.

主权项

1. A system of preventing migration of tissue and migration of a delivered substance through a pathway, comprising:
a needle comprising an elongated shaft that defines an outer surface; and a polymer coating applied to the outer surface of the elongated shaft, the polymer coating being released from the outer surface of the elongated shaft into the tissue to act as a plug to block the pathway formed by insertion of the needle into the tissue following withdrawal of the needle from the tissue, wherein the polymer coating comprises a polymer selected from the group comprising polyethylene oxide (PEO), sodium alginate, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), dextran, and combinations thereof.