US 11,918,784 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 Mar. 3, 2023, as Appl. No. 18/116,962.
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 2023/0201459 A1, Jun. 29, 2023
Int. Cl. A61M 5/178 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/178 (2013.01) [A61M 5/32 (2013.01)] 6 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;
an encoder unit disposed at an end of the driving unit to measure rotation of the driving unit; and
a control module for determining over-injection or under-injection of a medical liquid based on the detection of the rotation of the driving unit by the encoder unit,
wherein the control module is configured to:
determine that a current contact pattern for the encoder unit is a first contact pattern based on the detection of the rotation of the driving unit by the encoder unit,
calculate a number of confirmations by checking whether the current contact pattern is maintained as the first contact pattern,
obtain a number of confirmations of the first contact pattern in response to a change of the current contact pattern from the first contact pattern to a second contact pattern, and
determine whether the medical liquid is over-injected or under-injected based on the number of confirmations.