Patent ID: 11918784
Assignee: EOFLOW CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
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.