Medical devices

Abstract

To provide a medical device with improved surface smoothness and which has a coating layer for preventing biting of a biological tissue formed at a tip end thereof, the device being manufactured by a simplified coating process.SOLUTION: A medical device (dilator) 10 includes: a shaft 2 formed in a hollow shape by winding one or a plurality of metal wires 21; and a projection 3 provided in a spiral manner along an axial direction of the shaft 2 around an outer periphery of the shaft 2. A tip end of the shaft 2 at which the projection 3 is provided is covered with a coating layer 6. The coating layer 6 includes: a first coating layer 61 formed on a surface of the shaft 2 and the projection 3; a second coating layer 62 formed on a surface of the first coating layer 61; and a third coating layer 63 formed on a surface of the second coating layer 62.SELECTED DRAWING: Figure 2

Claims

1. A shaft formed into a hollow shape by winding one or more metal wires, The shaft comprises a convex portion provided spirally on its outer circumference along the axial direction of the shaft, The tip of the shaft on which the protrusion is provided is covered with a coating layer. The aforementioned coating layer The first coating layer formed on the surface of the shaft and the protrusion, A second coating layer formed on the surface of the first coating layer, It has a third coating layer formed on the surface of the second coating layer, The first coating layer is a primer layer that enhances the adhesion between the shaft and the protrusion and the second coating layer. The second coating layer is an intermediate layer that fills in the irregularities between the metal wires constituting the shaft and the irregularities between the metal wires constituting the shaft and the protrusions, thereby smoothing the surface. A medical device in which the third coating layer is a hydrophilic coating layer for imparting hydrophilicity to the outermost surface of the tip portion.

2. The aforementioned protrusions have gaps between adjacent protrusions along the axial direction, In the coating layer formed in the gap, The first coating layer is formed to be thinner than the second coating layer. The medical device according to claim 1, wherein the second coating layer is formed to be thinner than the third coating layer.

3. The medical device according to claim 1 or 2, wherein the protrusion is formed by spirally winding a metal wire around the outer circumferential surface of the shaft.

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