US 11,672,911 B2
Needleless injector, method of adjusting on-completion reached depth with needleless injector, and ejection parameter calculation program for needleless injector
Takamasa Suzuki, Hyogo (JP); Shingo Atobe, Osaka (JP); Hiroshi Miyazaki, Osaka (JP); Hiromitsu Iga, Hyogo (JP); and Katsuya Miki, Osaka (JP)
Assigned to Daicel Corporation, Osaka (JP)
Appl. No. 16/626,291
Filed by DAICEL CORPORATION, Osaka (JP)
PCT Filed Jun. 27, 2018, PCT No. PCT/JP2018/024466
§ 371(c)(1), (2) Date Dec. 23, 2019,
PCT Pub. No. WO2019/004322, PCT Pub. Date Jan. 3, 2019.
Claims priority of application No. JP2017-125672 (JP), filed on Jun. 27, 2017.
Prior Publication US 2020/0276392 A1, Sep. 3, 2020
Int. Cl. A61M 5/178 (2006.01); A61M 5/20 (2006.01); A61M 5/30 (2006.01)
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
OG exemplary drawing
 
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.