Resin hollow needle, outer cylinder with puncture portion, and pre-filled syringe

An outer cylinder with puncture portion comprising:

• an outer cylinder main body having a cylindrical shape;
• and
• a hollow puncture portion that is located in a distal end portion of the outer cylinder main body,
• wherein the puncture portion comprises a distal end section that includes a puncture end portion at a distal end thereof, a large-diameter section having a diameter greater than a diameter of the distal end section, and a tapered section that is located between the large-diameter section and the distal end section,
• wherein the distal end section includes a hole that communicates with an inside and an outside of the puncture portion, and the puncture end portion has a tapered shape,
• wherein the distal end section has a total length in a range of 7 to 14 mm, and a maximum outer diameter in a range of 1.5 to 3.0 mm,
• wherein the tapered section has a length in a range 0.3 to 4.7 mm, and a taper angle in a range of 10° to 50°,
• wherein the large-diameter section has a length of being a range 4 to 12 mm, and a distal end outer diameter that is greater than the maximum outer diameter of the distal end section by a range of 0.6 to 3.0 mm,
• wherein the distal end section is pierceable an elastic container-sealing member of a vial container, and the distal end section and the tapered section are pierceable an elastic port-sealing member of a port of an infusion solution container, and
• wherein the large-diameter section is configured to enter into the elastic port-sealing member, and a state of the large-diameter section being entering into the elastic port-sealing member is maintained due to a pressure applied from the elastic port-sealing member.

A method of using a resin hollow needle, the method comprising:

• providing the resin hollow needle, which comprises:
• a distal end section including a puncture end portion at a distal end thereof,
• a large-diameter section having a diameter greater than a diameter of the distal end section,
• a tapered section that is located between the large-diameter section and the distal end section, and has a diameter that expands toward a proximal end of the tapered section, and
• a hub section that is provided in a proximal end of the hollow needle and is attachable to a Luer-taper nozzle of a prefilled syringe,
• wherein the distal end section includes a hole that communicates with the inside and the outside of the resin hollow needle;
• providing the pre-filled syringe, which comprises:
• an outer cylinder that includes an outer cylinder main body having a cylindrical shape and the Luer-taper nozzle provided at a distal end portion of the outer cylinder main body and including a distal end opening,
• a gasket that is slidably accommodated in the outer cylinder,
• a medical liquid that is filled in the outer cylinder,
• a sealing member that seals the distal end opening of the outer cylinder, and
• a plunger that is attached to a proximal end of the gasket;
• providing a vial container that comprises:
• a body portion including an inner space,
• a vial opening communicating with the inner space,
• an elastic container-sealing member sealing the vial opening, and
• a drug accommodated in the inner space and configured to be dissolved or diluted with the medical liquid;
• providing an infusion solution container that comprises:
• a container body filled with an infusion solution,
• a port communicating with the container body and including a port opening, and
• an elastic port-sealing member sealing the port opening;
• attaching the hub section of the hollow needle to the Luer-taper nozzle of the prefilled syringe';
• puncturing the container-sealing member of the vial container with the distal section of the hollow needle such that a distal end of the tapered section reaches an upper surface of the container-sealing member so as to generate a resistance against the puncturing, and such that the hole of the distal end portion communicates with the inner space of the vial container;
• injecting the medical liquid into the inner space of the vial container via the hollow needle by pushing the plunger;
• dissolving or diluting the drug with the medical liquid to obtain a medical solution;
• suctioning the medical solution into the outer cylinder by pulling the plunger;
• removing the outer cylinder from the vial container together with the medical solution filled in the outer cylinder and the hollow needle attached to the outer cylinder;
• puncturing the port-sealing member of the infusion solution container with the hollow needle attached to the outer cylinder that is filled with the medical solution such that the distal end section and the tapered section of the hollow needle penetrate the port-sealing member to reach an inside of the port, and such that the large-diameter section is located at an inside of the port-sealing member to generate an elastic force of the port-sealing member and lock the large-diameter section to the inside of the port-sealing member by the elastic force;
• and
• injecting the medical solution into the infusion solution container via the hollow needle by pushing the plunger while the large-diameter section is locked to the inside of the port-sealing member.