Injection neddle assembly and medicine injection device

Abstract

A needle tube having a needle tip for puncturing skin; a needle hub; and a fluid-draining portion for enabling draining of a medicine. The needle hub includes: a retention part (first member) for retaining the needle tube; an insertion part into which the output portion of a syringe is inserted; and a flange-like skin contact portion that is disposed in a manner so as to cover an area surrounding the needle tube and makes contact with and/or faces the skin when a living body is punctured with the needle tube. The fluid-draining portion is disposed in the skin contact portion of the needle hub and enables a user to drain the medicine that has spilled when removing air and is held in the skin contact portion.

What is claimed is: 
     
         1 . An injection needle assembly, comprising:
 a needle tube having a needle tip for puncturing the skin;   a needle hub including: a front end part that retains the needle tube and from which the needle tip of the needle tube protrudes; an insertion part into which an output portion of a syringe is inserted; and a flange-like skin contact portion that is disposed so as to surround the front end part and that makes contact with and/or faces the skin when a living body is punctured with the needle tube; and   a fluid-draining portion that is disposed in the skin contact portion of the needle hub and enables draining of a medicine staying in the skin contact portion.   
     
     
         2 . The injection needle assembly according to  claim 1 , wherein
 the fluid-draining portion is formed by coating the skin contact portion with a lubricant.   
     
     
         3 . The injection needle assembly according to  claim 1 , wherein
 a fluid-draining concave portion that is recessed toward the insertion part of the needle hub is formed in the fluid-draining portion, wherein the fluid-draining concave portion includes a sloped surface inclined upward from a bottom of the concave portion toward an edge of the skin contact portion.   
     
     
         4 . The injection needle assembly according to  claim 3 , wherein
 the concave portion is curved.   
     
     
         5 . The injection needle assembly according to  claim 3 , wherein
 the concave portion is coated with a lubricant.   
     
     
         6 . The injection needle assembly according to  claim 1 , wherein
 the skin contact portion comprises:   an adjustment portion that is disposed in an area surrounding the needle tube and includes a needle protrusion surface from which the needle tip of the needle tube protrudes;   a cylindrically formed stabilizer that is disposed in a manner so as to cover an area surrounding the needle tube and makes contact with skin when a living body is punctured with the needle tube; and   a guide portion that is disposed on an outer circumferential surface of the stabilizer and makes contact with the skin when the living body is punctured with the needle tube, thereby guiding a pressing force of both the needle tube and the stabilizer and defining the force to be exerted to the living body.   
     
     
         7 . The injection needle assembly according to  claim 6 , wherein
 the fluid-draining portion is disposed in a concave portion formed by the adjustment portion and the stabilizer.   
     
     
         8 . A medicine injection device, comprising:
 a syringe having an output portion;   a needle tube having a needle tip for puncturing the skin;   a needle hub including: a retention part for retaining the needle tube; an insertion part into which an output portion of the syringe is inserted; and a flange-like skin contact portion that is disposed in a manner so as to cover an area surrounding the needle tube and makes contact with and/or faces the skin when the living body is punctured with the needle tube; and   a fluid-draining portion that is disposed in the skin contact portion of the needle hub and enables draining of a medicine staying in the skin contact portion.   
     
     
         9 . The medicine injection device according to  claim 8 , wherein
 the fluid-draining portion is formed by coating the skin contact portion with a lubricant.   
     
     
         10 . The medicine injection device according to  claim 8 , wherein
 a fluid-draining concave portion that is recessed toward the insertion part of the needle hub is formed in the fluid-draining portion, wherein the fluid-draining concave portion includes a sloped surface inclined upward from a bottom of the concave portion toward an edge of the skin contact portion.   
     
     
         11 . The medicine injection device according to  claim 10 , wherein
 the concave portion is curved.   
     
     
         12 . The medicine injection device according to  claim 10 , wherein
 the concave portion is coated with a lubricant.   
     
     
         13 . The medicine injection device according to  claim 8 , wherein
 the skin contact portion comprises:   an adjustment portion that is disposed in an area surrounding the needle tube and includes a needle protrusion surface from which the needle tip of the needle tube protrudes;   a cylindrically formed stabilizer that is disposed in a manner so as to cover an area surrounding the needle tube and makes contact with skin when a living body is punctured with the needle tube; and   a guide portion that is disposed on an outer circumferential surface of the stabilizer and makes contact with the skin when the living body is punctured with the needle tube, thereby guiding a pressing force of both the needle tube and the stabilizer and defining the force to be exerted to the living body.   
     
     
         14 . The injection needle assembly according to  claim 13 , wherein
 the fluid-draining portion is disposed in a concave portion formed by the adjustment portion and the stabilizer.   
     
     
         15 . A method of using a medicine injection device comprising a syringe filled with a medicine and having an output portion; a needle tube having a needle tip for puncturing the skin; a needle hub including a retention part for retaining the needle tube and an insertion part into which an output portion of the syringe is inserted; a flange-like skin contact portion that is disposed in a manner so as to cover an area surrounding the needle tube and makes contact with and/or faces the skin when the living body is punctured with the needle tube; and a fluid-draining portion that is disposed in the skin contact portion of the needle hub, said method comprising:
 removing air from the medicine injection device prior to injection of the medicine, whereby medicine spilled from the needle tip is caught in the fluid-draining portion;   draining the spilled medicine in the fluid-draining portion by tipping the medicine injection device;   positioning the skin contact portion adjacent the skin;   puncturing the skin with the needle tip; and   injecting medicine from the needle tip into the skin.