| 摘要 |
A guidewire has a proximal portion and a distal portion. The distal portion may be coated, as with a hydrophilic or other coating, or may be uncoated. The proximal portion, however, is coated with a specially lubricious coating that serves to reduce resistance and to prevent lock up as the guidewire moves through a guiding catheter. The proximal portion may, for example, be coated with a base layer, such as TEFLON(R) (polytetrafluoroethylene), and one or more top layers, such as a silicone-based layer. In one approach, two silicone-based top layers are applied. Alternatively, a top layer of spray PTFE, paraffins, olefins, and/or fats may be applied. As an alternative, the base layer may be optional, such that the top layer or layers is coated onto bare metal, or a base other than TEFLON(R) may be used. |
