Abstract: Provided is a method for plating a biocompatible coating with nano structure on the surface of a nickel-titanium shape memory alloy, particularly a method suitable for plating a coating on the surface of medical devices made of nickel-titanium alloy. The method includes the following steps: heat treating, surface pretreating, ion sputter cleaning, depositing a pseudodiffusion layer, plating a sub-layer film, plating a pure TiN layer, and so on. The coating has the following advantages: 1) it could deform in response to the deformation of substrate without delaminating and cracking; 2) it has less resistance to the deformation of substrate; 3) it has less penetrable holes so as to reduce the dissolution of nickel into bio-body through these holes; 4) the coating has better biocompatibility compared to the substrate material.

Abstract: Provided is a method for plating a biocompatible coating with nano structure on the surface of a nickel-titanium shape memory alloy, particularly a method suitable for plating a coating on the surface of medical devices made of nickel-titanium alloy. The method includes the following steps: heat treating, surface pretreating, ion sputter cleaning, depositing a pseudodiffusion layer, plating a sub-layer film, plating a pure TiN layer, and so on. The coating has the following advantages: 1) it could deform in response to the deformation of substrate without delaminating and cracking; 2) it has less resistance to the deformation of substrate; 3) it has less penetrable holes so as to reduce the dissolution of nickel into bio-body through these holes; 4) the coating has better biocompatibility compared to the substrate material.

Abstract: The present invention relates to heart septal defect occlusion devices with adjustable length tether which can adapt the interseptal length of the device to the unique anatomy of the patient. The right disc as recited in the present invention is made from a double-deck metal mesh with contraction function, and the left disc is made from at least two skeletons covered by membranes. The two discs are active linked together. Because the connection of the two discs has gimbal function and the distance between the two discs may expand and contract suitably, the device can adapt to the unique anatomy of the patient. Therefore the two discs may attach to the heart valves closely and increase its closing ability. Furthermore it can reduce the thrombus and operate more easily.

Abstract: The present invention relates to heart septal defect occlusion devices with adjustable length tether which can adapt the interseptal length of the device to the unique anatomy of the patient. The right disc as recited in the present invention is made from a double-deck metal mesh with contraction function, and the left disc is made from at least two skeletons covered by membranes. The two discs are active linked together. Because the connection of the two discs has gimbal function and the distance between the two discs may expand and contract suitably, the device can adapt to the unique anatomy of the patient. Therefore the two discs may attach to the heart valves closely and increase its closing ability. Furthermore it can reduce the thrombus and operate more easily.