Syringe and prefilled syringe

A prefilled syringe, the prefilled syringe comprising:

• a syringe, the syringe comprising a barrel body including a body portion that is hollow and configured to be filled with a drug solution, and a cylindrical portion that protrudes in a distal direction from a distal end of the body portion and includes an opening at a distal end of the cylindrical portion, the cylindrical portion defining a flow path that connects an inside of the body portion and the opening, a cap including a cap body that is attached to the cylindrical portion, the cap body being made of an elastic material, the cylindrical portion includes a female luer section having an inner diameter reduced in a proximal direction from the opening and configured to be engageable with a male luer section of another medical device, and a proximal end section that connects the female luer section and the body portion, the cap body includes a base located closer to the distal end than the opening in a state where the cap body is attached to the cylindrical portion, and an insertion portion that protrudes from the base in a proximal direction and configured to be inserted into the cylindrical portion, the insertion portion of the cap body includes a first sealing section provided at a distal end of the insertion portion and having an outer diameter greater than a diameter of the opening in a natural state where the cap body is not attached to the cylindrical portion, and a second sealing section provided at a proximal end of the insertion portion and having an outer diameter greater than an inner diameter of the proximal end section of the cylindrical portion in the natural state, and when the cap body is attached to the cylindrical portion, the first sealing section seals a distal end section of the flow path in a liquid-tight manner by being compressed radially inward by an inner peripheral surface constituting the opening of the cylindrical portion, and the second sealing section seals a proximal end section of the flow path in a liquid-tight manner by being compressed radially inward by an inner peripheral surface of the proximal end section of the cylindrical portion;
• a drug solution filled in the body portion;
• and
• a gasket that is slidable in an axial direction within the body portion in a liquid-tight manner.

A syringe, the syringe comprising:

• a barrel body including a hollow body portion and a cylindrical portion that protrudes in a distal direction from a distal end of the body portion and includes an opening at a distal end of the cylindrical portion, the cylindrical portion defining a flow path that connects an inside of the body portion and the opening;
• a cap including a cap body that is attached to the cylindrical portion, the cylindrical portion includes a female luer section having an inner diameter reduced in a proximal direction from the opening and configured to be engageable with a male luer section of another medical device, and a proximal end section that connects the female luer section and the body portion;
• the cap body includes a base located closer to the distal end than the opening in a state where the cap body is attached to the cylindrical portion, and an insertion portion that protrudes from the base in a proximal direction and configured to be inserted into the cylindrical portion;
• the insertion portion of the cap body includes a first sealing section provided at a distal end of the insertion portion and having an outer diameter greater than a diameter of the opening in a natural state where the cap body is not attached to the cylindrical portion, and a second sealing section provided at a proximal end of the insertion portion and having an outer diameter greater than an inner diameter of the proximal end section of the cylindrical portion in the natural state;
• when the cap body is attached to the cylindrical portion, the first sealing section seals a distal end section of the flow path in a liquid-tight manner by being compressed radially inward by an inner peripheral surface constituting the opening of the cylindrical portion, and the second sealing section seals a proximal end section of the flow path in a liquid-tight manner by being compressed radially inward by an inner peripheral surface of the proximal end section of the cylindrical portion;
• and
• a cylindrical cover member, the cylindrical cover member including an engagement portion configured to be engaged with the base of the cap body, and wherein the cover member is configured to be attachable to the cap body so as to cover at least a part of an outer peripheral surface of the base due to an engagement between the engagement portion and the base.