Syringe with needle, prefilled syringe, and medical liquid administration tool using the same

A prefilled syringe comprising:

• a syringe with needle comprising:
• an outer cylinder including an outer cylinder body part and a needle fixing part provided at a distal end part of the outer cylinder body part;
• an injection needle having a puncturing needle tip at a distal end, a proximal end part of the injection needle being fixed to the needle fixing part of the outer cylinder;
• and
• a gasket housed in the outer cylinder and capable of sliding within the outer cylinder in a liquid-tight state, wherein
• the injection needle is such a tapered part holding injection needle that a puncturing time piercing part having the puncturing needle tip has an outer diameter of 0.42 mm or less and has a thickness of 0.1 mm or less, the tapered part holding injection needle having a proximal end with a greater outer diameter than the puncturing time piercing part, or the injection needle is such a small diameter ultrathin injection needle that a puncturing time piercing part having the puncturing needle tip has an outer diameter of 0.42 mm or less and has a thickness of 0.04 mm or less, the small diameter ultrathin injection needle extending from a distal end to a proximal end with substantially the same outer diameter, and
• the gasket includes a gasket body made of an elastic body and a soft coating provided on at least a portion that comes into contact with the inner surface of the outer cylinder, the soft coating having a liquid-tight sliding property with respect to the inner surface of the outer cylinder;
• a seal cap that seals a distal end part of the injection needle;
• and
• a medical liquid with which the syringe is filled.

A medical liquid administration tool comprising:

• an autoinjector;
• and
• a prefilled syringe mounted in the autoinjector, the prefilled syringe comprising:
• a syringe with needle comprising:
• an outer cylinder including an outer cylinder body part and a needle fixing part provided at a distal end part of the outer cylinder body part;
• an injection needle having a puncturing needle tip at a distal end, a proximal end part of the injection needle being fixed to the needle fixing part of the outer cylinder;
• and
• a gasket housed in the outer cylinder and capable of sliding within the outer cylinder in a liquid-tight state, wherein
• the injection needle is such a tapered part holding injection needle that a puncturing time piercing part having the puncturing needle tip has an outer diameter of 0.42 mm or less and has a thickness of 0.1 mm or less, the tapered part holding injection needle having a proximal end with a greater outer diameter than the puncturing time piercing part, or the injection needle is such a small diameter ultrathin injection needle that a puncturing time piercing part having the puncturing needle tip has an outer diameter of 0.42 mm or less and has a thickness of 0.04 mm or less, the small diameter ultrathin injection needle extending from a distal end to a proximal end with substantially the same outer diameter, and
• the gasket includes a gasket body made of an elastic body and a soft coating provided on at least a portion that comes into contact with the inner surface of the outer cylinder, the soft coating having a liquid-tight sliding property with respect to the inner surface of the outer cylinder;
• a seal cap that seals a distal end part of the injection needle;
• and
• a medical liquid with which the syringe is filled.