CPC A61M 5/2046 (2013.01) [A61M 5/2053 (2013.01); A61M 5/30 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/50 (2013.01); A61M 2205/8206 (2013.01)] | 13 Claims |
1. A needleless injector that injects a substance to be injected to a target region without using an injection needle, the needleless injector comprising:
an encapsulating portion configured to encapsulate the substance to be injected;
a pressurizing portion configured to pressurize the substance encapsulated in the encapsulating portion; and
a flow path including an ejection port through which the substance pressurized by the pressurizing portion is ejected to the target region,
wherein:
the pressurizing portion is configured to pressurize the substance having an ejection pressure defined as a pressure of the substance ejected through the ejection port, the ejection pressure being raised to a first peak pressure after pressurizing is started, being lowered to a pressure lower than the first peak pressure afterward, and then being raised to a second peak pressure again, and
an on-completion reached depth that is an on-completion reached depth of the substance in the target region when the pressurizing portion completes pressurizing at a pressurizing completion timing when the ejection pressure is substantially zero is adjustable, the on-completion reached depth configured to increase along with an increase of the first peak pressure in combination with reduction of a length between peaks from a first timing at which the ejection pressure reaches the first peak pressure to a second timing at which the ejection pressure reaches the second peak pressure.
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