Method of manufacturing injection needles

A method of manufacturing an injection needle having a hub with a center hole and a cannula inserting in the center hole, the cannula having a front end with a sharp bevel and a back end with another sharp bevel, the back end terminating within the hub, comprising the steps of:

• (a) mounting the hub on a first subassembly jig capable of supporting individually the hub and the cannula in predetermined positions relative to each other, with the front end of the cannula pointed upward;
• (b) inserting the cannula into the center hole of the hub to a depth limited by the first subassembly jig;
• (c) applying an adhesive to a bonding area of the hub and the cannula;
• (d) curing the adhesive in the bonding area to form a hub-cannula assembly;
• (e) dismounting the hub-cannula assembly from the first subassembly jig;
• (f) applying silicone-containing-liquid to the back end of the cannula of the hub-cannula assembly;
• (g) mounting the hub-cannula assembly, whose back end has been coated with silicone-containing-liquid, on a second subassembly jig having a hollow cylindrical rest capable of supporting the hub-cannula assembly by contacting only the hub, with the front end of the cannula pointed upward;
• (h) removing excess amount of silicone-containing-liquid within the cannula;
• (i) applying silicone-containing-liquid to the front end of the cannula of the hub-cannula assembly;
• (j) covering the front end of the cannula with a cap of an elongated cylindrical shape having an open end and a semi-spherical closed end to form a hub-cannula-cap assembly;
• (k) housing the hub-cannula-cap assembly into a container having an opening at one end to form a hub-cannula-cap-container assembly;
• (l) dismounting the hub-cannula-cap-container assembly from the second subassembly jig;
• and
• (m) sealing the opening of the container of the hub-cannula-cap-container assembly.