Applicator

An applicator for ejecting together with a gas a mixed liquid obtained by mixing a first liquid and a second liquid which are different from each other in composition, the applicator comprising:

• a first liquid flow path through which the first liquid flows;
• a first liquid supply section that communicates with the first liquid flow path and supplies the first liquid into the first liquid flow path;
• a first backflow preventing section fluidly connected to a distal end of the first liquid supply section and to a proximal end of the first liquid flow path, wherein the first backflow preventing section prevents backflow of the first liquid into the first liquid supply section;
• a second liquid flow path through which the second liquid flows;
• a second liquid supply section that communicates with the second liquid flow path and supplies the second liquid into the second liquid flow path;
• a second backflow preventing section fluidly connected to a distal end of the second liquid supply section and to a proximal end of the second liquid flow path, wherein the second backflow preventing section prevents backflow of the second liquid into the second liquid supply section;
• a gas flow path through which the gas flows;
• and
• a confluence section in which the first liquid and the second liquid merge with each other to form the mixed liquid, at least part of a wall portion defining the confluence section being composed of a gas-permeable membrane which is impermeable to the mixed liquid and permeable to the gas.

A method for applying a liquid to a patient, the method comprising:

• providing an applicator, the applicator comprising:
• a first liquid flow path through which the first liquid flows;
• a first liquid supply section that communicates with the first liquid flow path and supplies the first liquid into the first liquid flow path;
• a first backflow preventing section fluidly connected to a distal end of the first liquid supply section and to a proximal end of the first liquid flow path, wherein the first backflow preventing section prevents backflow of the first liquid into the first liquid supply section;
• a second liquid flow path through which the second liquid flows;
• a second liquid supply section that communicates with the second liquid flow path and supplies the second liquid into the second liquid flow path;
• a second backflow preventing section fluidly connected to a distal end of the second liquid supply section and to a proximal end of the second liquid flow path, wherein the second backflow preventing section prevents backflow of the second liquid into the second liquid supply section;
• a gas flow path through which the gas flows;
• a confluence section in which the first liquid and the second liquid merge with each other to form the mixed liquid, at least part of a wall portion defining the confluence section being composed of a gas-permeable membrane which is impermeable to the mixed liquid and permeable to the gas;
• conducting a first application by:
• injecting the gas into the gas flow path;
• after injecting the gas, applying a first force to the first syringe to force the first liquid into the confluence section;
• after injecting the gas, applying a second force to the first syringe to force the first liquid into the confluence section;
• mixing the first and second liquids to form a third liquid;
• and
• jetting the third liquid from the applicator by force of the gas.