US 12,097,356 B2
Liquid medicine injection device
Seungha Kim, Goyang-si (KR); Hyunduk Roh, Seoul (KR); Seonhwan Kim, Seongnam-si (KR); and Daejong Park, Seoul (KR)
Assigned to EOFLOW CO., LTD., Seongnam-si (KR)
Filed by EOFLOW CO., LTD., Seongnam-si (KR)
Filed on Jan. 29, 2024, as Appl. No. 18/426,297.
Application 18/426,297 is a continuation of application No. 18/116,962, filed on Mar. 3, 2023, granted, now 11,918,784.
Application 18/116,962 is a continuation of application No. PCT/KR2021/012116, filed on Sep. 7, 2021.
Claims priority of application No. 10-2020-0114111 (KR), filed on Sep. 7, 2020; and application No. 10-2020-0133191 (KR), filed on Oct. 15, 2020.
Prior Publication US 2024/0165331 A1, May 23, 2024
Int. Cl. A61M 5/178 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/178 (2013.01) [A61M 5/32 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A medical liquid injection device comprising:
a base body;
a needle assembly mounted on the base body;
a reservoir fluidly connected to the needle assembly and having a plunger therein;
a driving unit that linearly moves the plunger; and
an encoder unit disposed at an end of the driving unit to measure rotation of the driving unit, wherein
the encoder unit comprises:
a base cover mounted on the end of the driving unit and rotating together with the driving unit;
a first contact end connected to contact one side of the base cover; and
a second contact end disposed on another side of the base cover and selectively contacting the base cover according to rotation of the driving unit,
the base cover comprises:
a cover end extending in a circumferential direction of the driving unit which rotates; and
a plurality of tooth ends extending from the cover end and spaced apart from each other along the circumferential direction of the cover end,
the driving unit comprises:
a protruding end disposed between adjacent tooth ends of the plurality of tooth ends, and a height of the protruding end varies in a radial direction thereof so that the protruding end and the tooth ends have a step in a circumferential direction, and
the protruding end has a first wall and a second wall on one side and another side thereof, respectively, wherein a height of the first wall is smaller than a height of each of the tooth ends and the height of the second wall is greater than the height of the tooth end, and a height of the protruding end is increased from the first wall to the second wall.