MediShield™ Tie-layer Coating

A tie-layer coating is a functional interlayer applied between two dissimilar materials — most often a metal substrate and a polymer component — to promote adhesion where the two would not otherwise bond well on their own. Metal and polymer surfaces have very different surface energies and chemistries, so a bare interface between them is prone to delamination under the flexing, torque, and repeated-use conditions typical of interventional devices. MediShield™ Tie-layer Coating bonds strongly with both the metal surface and the polymer surface and secure them together. It is frequently used to bridge the laser-cut slots of a hypotube or the wire gaps of a braid- or coil-reinforced shaft, binding the metal structure to an inner polymer liner while preserving the flexibility designed into the cut or braid pattern.