1. Technical Field
The present invention relates to a fluid infuser configured to infuse fluid into an object of fluid infusion such as a biological body.
2. Related Art
In order to transport drug solution from an administration pump to a subcutaneous structure, an infusion tube such as a catheter is inserted into and indwelt in the subcutaneous structure. Since the catheter is formed of a soft material which adapts to the subcutaneous structure. Therefore, in order to insert the catheter into the subcutaneous structure, the catheter covers a metallic needle, and is inserted simultaneously into the subcutaneous structure together with the metallic needle.
JP-A-2001-245982 discloses a double injection needle in which a metallic needle (inner needle) is covered with a catheter (soft jacket needle). The fact that projections are provided on a peripheral surface of the metallic needle and the projections are provided in a direction corresponding to a direction of insertion of a metallic needle is disclosed.
An infusion tube such as a catheter is inserted into and indwells only the infusion tube in the subcutaneous structure, the infusion tube needs to be guided adequately to the subcutaneous structure or the like. After the infusion tube has been guided, an introduction needle inserted together with the infusion tube needs to be pulled out from the infusion tube. In other words, a fluid infuser configured to guide the infusion tube adequately and to be easily pulled from the infusion tube is desired.