Liquid medicine administration device

A liquid medicine administration device comprising:

• a catheter configured to be inserted into and left in place in a living body;
• a catheter hub that holds a proximal end of the catheter;
• a tube held by the catheter hub, the tube being connected to the catheter and configured to allow the liquid medicine to flow toward the catheter;
• a connector to which a device body is attachable, the connector being located at a proximal end of the tube;
• and
• a valve body that has a disk shape in a flow path between the catheter hub and a proximal end of the connector, the valve body having an opening and closing hole that has a slit shape and that opens during delivery of the liquid medicine, the valve body allowing the device body to communicate with the tube via the opening and closing hole.

A method comprising:

• providing a device body configured to deliver a liquid medicine from a distal portion of the device body;
• providing a liquid medicine administration device comprising:
• a catheter configured to be inserted into and left in place in a living body;
• a catheter hub that holds a proximal end of the catheter;
• a tube held by the catheter hub, the tube being connected to the catheter and configured to allow the liquid medicine to flow toward the catheter;
• a connector to which the device body is attached, the connector being located at a proximal end of the tube;
• and
• a valve body that has a disk shape in a flow path between the catheter hub and a proximal end of the connector, the valve body having an opening and closing hole that has a slit shape;
• and
• delivering the liquid medicine from the device body to the tube, during which the opening and closing hole opens and allows the device body to communicate with the tube via the opening and closing hole.