US-20260124364-A1 - LIQUID MEDICINE INJECTION DEVICE, DRUG INJECTION DEVICE, AND METHOD FOR DETERMINING REMAINING AMOUNT OF DRUG THEREOF

US20260124364A1US 20260124364 A1US20260124364 A1US 20260124364A1US-20260124364-A1

Abstract

Provided is a medical liquid injection device including a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and having an inner space in which a medical liquid is stored, a plunger disposed inside the reservoir, and configured to move in a longitudinal direction of the reservoir according to an amount of the medical liquid stored in the reservoir, and a first sensor unit configured to measure the amount of the medical liquid stored in the reservoir according to the movement of the plunger.

Inventors

Seungha KIM
Kiung KIM
Wonkyung BANG
Seonhwan KIM
Dae Jong Park
Jesse Jaejin Kim

Assignees

Dates

Publication Date: 20260507
Application Date: 20260102
Priority Date: 20200831

Claims (3)

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 an inner space in which a medical liquid is stored; a plunger disposed inside the reservoir, and configured to move in a longitudinal direction of the reservoir according to an amount of the medical liquid stored in the reservoir; and a first sensor unit configured to measure the amount of the medical liquid stored in the reservoir according to the movement of the plunger, wherein the plunger includes a connector member mounted on one side thereof and extending in the longitudinal direction of the reservoir, and wherein the first sensor unit includes a plurality of contact terminals disposed on a movement path of the connector member, wherein the connector member is brought into contact with the contact terminals according to the movement of the plunger to sense the amount of the medical liquid stored in the reservoir based on a moving distance of the plunger.
2 . The medical liquid injection device of claim 1 , wherein the connector member is electrically connected to at least one of a pair of the contact terminals to sense a storage amount of the medical liquid set in advance.
3 . The medical liquid injection device of claim 1 , wherein the contact terminal is disposed such that a center thereof is spaced apart from a center line of the connector member in a longitudinal direction and a surface thereof comes into contact with a surface of the connector member when the connector member linearly moves.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 18/114,332 filed on Feb. 27, 2023, which is a continuation of PCT/KR2021/008620 filed on Jul. 7, 2021, which claims priority to Korean Patent Application No. 10-2020-0114108 filed on Sep. 7, 2020 and Korean Patent Application No. 10-2020-0110675 filed on Aug. 31, 2020, entire contents of which are herein incorporated by reference. TECHNICAL FIELD The present disclosure relates to a medical liquid injection device. The present disclosure provides a medical liquid injection device and a method of determining a medical liquid remaining amount thereof. BACKGROUND ART In general, medical liquid injection devices such as insulin injection devices are used to inject medical liquids into patients'bodies. Although the medical liquid injection devices are sometimes used by professional medical staff such as doctors or nurses, in most cases, the medical liquid injection devices are used by general public such as the patients themselves or guardians. Diabetic patients, especially pediatric diabetic patients, need to inject medical liquids such as insulin into the body at regular intervals. Medical liquid injection devices in a form of patches that are attached to the human body for a certain period of time are being developed, and these medical liquid injection devices may be used in a state of being attached to the human body such as the patient's abdomen or waist for a certain period of time in the form of a patch. In order to increase the effect of medical liquid injection, the medical liquid injection device needs to be controlled to precisely inject a medical liquid into the patients'body, and it is important to precisely inject a small amount of medical liquid through a small-sized medical liquid injection device. The medical liquid injection device attached to the human body needs to be comfortable to wear, to be convenient to use, to be durable, and to be driven with low power. In particular, since a patient directly attaches the medical liquid injection device to the skin and uses it, it is important for a user to drive the medical liquid injection device conveniently and safely. Diabetes is a metabolic disorder that generates a sign indicating that a blood sugar level exceeds a normal range because of insufficient insulin secretion or abnormal function. Diabetes is a complex disease that possibly affects individual tissues of the human body due to complications such as blindness, renal failure, heart failure, and neuropathy, and the like, and the number of diabetic patients is increasing every year. In the case of diabetes, it is necessary to measure a blood sugar level using a blood sugar meter, and to manage the blood sugar level through appropriate means such as diet, exercise program, insulin injection, oral diabetes medication, and the like. Recently, there is a need of technology for accurately identifying a medical liquid remaining amount of a medical liquid injection device and efficiently providing information on the medical liquid remaining amount to a user. DESCRIPTION OF EMBODIMENTS Summary The present disclosure provides a medical liquid injection device capable of being safely driven and accurately delivering a medical liquid. The present disclosure provides a medical liquid injection device and a method of determining a medical liquid remaining amount thereof. The technical problem to be achieved by the present embodiment is not limited to the above-described technical problems, and other technical problems can be deduced from the following embodiments. Technical Solution to Problem One aspect of the present disclosure provides a medical liquid injection device including a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and having an inner space in which a medical liquid is stored, a plunger disposed inside the reservoir, and configured to move in a longitudinal direction of the reservoir according to an amount of the medical liquid stored in the reservoir, and a first sensor unit configured to measure the amount of the medical liquid stored in the reservoir according to the movement of the plunger. In addition, the plunger may include a connector member mounted on one side thereof and extending in one direction, and the first sensor unit may include a plurality of contact terminals disposed on a movement path of the connector member. In addition, the connector member may be electrically connected to at least one of a pair of the contact terminals to sense a storage amount of the medical liquid set in advance. In addition, the contact terminal may be disposed such that a center thereof is spaced apart from a center line of the connector member in a longitudinal direction and a surface thereof comes into contact with a surface of the connector member when the connector member linearly moves. As a technical means to achieve the