US 11,707,572 B2
Drug injection device
Kenji Murakami, Ehime (JP); Mitsuteru Fujimoto, Ehime (JP); Seiji Kikuchi, Ehime (JP); Toru Aoki, Ehime (JP); Masakazu Mori, Ehime (JP); Ryosuke Tani, Ehime (JP); Shinichi Kojima, Ehime (JP); Yoshihiro Kataoka, Ehime (JP); Katsumi Nakanishi, Ehime (JP); Tsuguhiro Kondo, Ehime (JP); Takashi Morimoto, Ehime (JP); and Akio Inoki, Ehime (JP)
Assigned to PHC HOLDINGS CORPORATION, Tokyo (JP)
Filed by PHC HOLDINGS CORPORATION, Tokyo (JP)
Filed on Dec. 2, 2020, as Appl. No. 17/109,575.
Application 17/109,575 is a division of application No. 15/779,005, granted, now 10,881,801, previously published as PCT/JP2016/087101, filed on Dec. 13, 2016.
Claims priority of application No. JP2015-252431 (JP), filed on Dec. 24, 2015.
Prior Publication US 2021/0085875 A1, Mar. 25, 2021
Int. Cl. A61M 5/24 (2006.01); A61M 5/145 (2006.01); A61M 5/20 (2006.01)
CPC A61M 5/24 (2013.01) [A61M 5/1456 (2013.01); A61M 5/1458 (2013.01); A61M 5/14546 (2013.01); A61M 2005/2013 (2013.01); A61M 2205/50 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A drug injection system comprising a cartridge adapter and a drug injection device, wherein;
the cartridge adapter comprises:
a cartridge holder having a space that can accommodate therein a drug cartridge, the drug cartridge including a cylinder having a tubular internal space extending in a longitudinal direction, a gasket supported in the internal space so as to be movable in the longitudinal direction, and a drug held in the internal space;
a piston that moves the gasket in the longitudinal direction in the internal space of the cylinder;
a piston guide that movably supports the piston and connected to the cartridge holder; and
a piston driving mechanism that drives the piston in the longitudinal direction, and
the drug injection device comprises:
a casing having an adapter space in which the cartridge adapter can be loaded, and an opening that communicates with the adapter space;
a driver that is in engagement with the piston driving mechanism of the cartridge adapter loaded in the adapter space and transmit a driving force;
an arithmetic circuit that controls the driver; and
a memory,
the piston driving mechanism of the cartridge adapter includes:
a male thread located on an outer circumference of the piston; and
a piston gear having an inner surface on which a female thread that meshes with the male thread is located and an outer surface on which gear teeth are disposed,
the driver includes a motor and a drive gear that rotates by receiving a driving force from the motor; and
in a state in which the cartridge adapter is loaded in the adapter space, the drive gear of the driver meshes with the piston gear of the piston driving mechanism.