Needle and manufacturing method thereof

A needle to be inserted into a puncture route extending from skin to a blood vessel under the skin to puncture the blood vessel, wherein:

• the needle is formed in a tubular shape and has an inclined end face at a tip of the needle, the inclined end face being inclined relative to an axis of the needle, a tip end of the inclined end face defining an unsharp edge;
• a material of the needle is a resin having an elastic modulus in bending of 300-2000 MPa and/or having an elastic modulus in tension of 200-2000 MPa, and/or having a deflection temperature under load (JIS K7191 (ISO 75)) at 0.45 MPa of 70-115° C.;
• and
• the needle is manufactured by injection molding using a ring-shaped gate.

A needle to be inserted into a puncture route extending from skin to a blood vessel under the skin to puncture the blood vessel, wherein:

• the needle is formed in a tubular shape and has an inclined end face at a tip of the needle, the inclined end face being inclined relative to an axis of the needle, a tip end of the inclined end face defining an unsharp edge;
• the needle has a flexibility of needle elastic modulus nE=1-900 Nmm as defined by an equation to be set forth below;
• a material of the needle is a resin;
• the inclined end face of the needle is free from a cut mark formed by post-treatment;
• and
• the needle has a reduced amount of short shot, flash and gate marks, has more uniform wall thickness, and has smoother inner and outer surfaces, as compared to a needle manufactured by injection molding using a pin gate, wherein
• the needle elastic modulus nE=(M2−M1)/(ε2−ε1), where:
• M1 is a bending moment under a bending strain of 0.0005 in a three-point bending test;
• M2 is a bending moment under a bending strain of 0.0025 in the three-point bending test;
• ε1 is a bending strain of 0.0005;
• and
• ε2 is a bending strain of 0.0025.

A needle to be inserted into a puncture route extending from skin to a blood vessel under the skin to puncture the blood vessel, wherein:

• the needle is formed in a tubular shape and has an inclined end face at a tip of the needle, the inclined end face being inclined relative to an axis of the needle, a tip end of the inclined end face defining an unsharp edge;
• a material of the needle is a resin having an elastic modulus in bending of 300-2000 MPa and/or having an elastic modulus in tension of 200-2000 MPa, and/or having a deflection temperature under load (JIS K7191 (ISO 75)) at 0.45 MPa of 70-115° C.;
• the inclined end face of the needle is free from a cut mark formed by post-treatment;
• and
• the needle has a reduced amount of short shot, flash and gate marks, has more uniform wall thickness, and has smoother inner and outer surfaces, as compared to a needle manufactured by injection molding using a pin gate.