A process for the manufacture of fine tube for injection needles from stainless steel sheet. The stainless steel sheet used is a special product with hardness and tenacity optimized for fabrication of injection needles. The manufacturing process involves rolling stainless steel sheet and welded into fine tube. In the floating process, the diameter and wall thickness are repeatedly reduced to the approximate dimensions required for the injection needles.
The knowledge and experience of manufacturing staff is particularly important in this process. The technology developed over more than 50 years of injection needle manufacture is utilized in the manufacture of superior fine stainless steel pipe sold also for use in industrial applications.

The stainless steel tube from the tube manufacturing process is annealed to a hardness suitable for fabrication. Diameter and wall thickness are then adjusted to specification in the drawing process, the tube is passed through a straightening machine to produce a straight tube, which is then cut to length. Stainless steel tube is sampled at a rate of 6 in 5000. Five of the samples are inspected, and one retained in storage.
Diameter and wall thicknesses of stainless steel cut tube differ considerably to suit injection needle specifications from customers all over the world. While introducing the most advanced production line equipment, we utilize our years of accumulated experience in the manufacture of stainless steel cut tube to a variety of specifications.

The fine stainless steel cut tube for use in injection needles is sent to the inspection room and inspected by veteran staff for kinks, scratches, and contamination etc. Diameter, wall thickness, and deflection etc. are accurately measured in sampling inspections, and further inspections conducted to evaluate breaking resistance, bending strength, elasticity, appearance, and inside diameter. Testing is conducted in accordance with an inspection plan, and results recorded.
Misawa Medical Industry's stainless steel cut tube is of uniform quality, high integrity relative to the required specifications, and is highly evaluated product. Total inspection: Twisting, scratching, contamination
Total inspection：wisting, scratching, contamination
Sampling inspection： Fracture resistance, flexural strength, elasticity, appearance, inside diameter

Stainless steel tube manufactured to the thickness of the injection needle is further processed according to specified application. The needle tip is ground with a high-speed grinding wheel. Burrs on the tips of the smooth cannula of cleaning needles etc. are removed by an electrolytic process, surface-treated, cleaned down to the base stainless steel surface, and sent to a clean room. The needle tips are fabricated to various requirements, and the manufacturing process is constantly reviewed according to a wide range of requirements. Misawa Medical Industry accepts the challenge of developing new injection needles in response to new medical techniques constantly in development around the world.

All assembly work is carried out in the clean room. All finally cleaned cannulas are inspected and sent to the assembly process. The cannula and hub are glued together in the assembly process, coated, and the cap attached. All processes are automated, and products without cannula and defective needles, as well as points (tip bend), are inspected for all needles. Assembled injection needles are inspected for adhesion strength and puncture resistance. Injection needles with low resistance to penetration resistance, and consequently less pain, are highly desirable in many countries, and are available as cannula and bulk products to suit customer requirements.

The assembled injection needles are packed 10 per sheet, each sheet inspected, and packed 10 sheets per box. Each box is fed to the sterilizing process and shipped as an OEM product. Since Misawa Medical Industry manufactures OEM products for many countries, all packaging and boxes are printed with individual customer branding. The final processes of packaging, boxing and sterilization can be implemented in accordance with the requirements of each OEM customer. It is therefore possible to specify sterilized, un-sterilized, boxless etc. formats as necessary. We also offer a sterilization-only service.

Packaging　　Boxing　　Sterilization