US 11,738,137 B2
Liquid medicine injection device
Seung Ha Kim, Goyang-si (KR); Jae Hong Kim, Namyangju-si (KR); Jesse Jaejin Kim, Seongnam-si (KR); and Yongchul Song, Seongnam-si (KR)
Assigned to EOFLOW CO., LTD., Seongnam-si (KR)
Filed by EOFlow Co., Ltd., Seongnam-si (KR)
Filed on Dec. 27, 2019, as Appl. No. 16/729,205.
Application 16/729,205 is a continuation of application No. 16/326,756, granted, now 10,549,030, previously published as PCT/KR2017/008290, filed on Aug. 1, 2017.
Claims priority of application No. 10-2016-0115650 (KR), filed on Sep. 8, 2016.
Prior Publication US 2020/0129692 A1, Apr. 30, 2020
Int. Cl. A61M 5/142 (2006.01); A61M 5/145 (2006.01); A61M 39/24 (2006.01); A61M 5/168 (2006.01); A61M 5/172 (2006.01); A61M 31/00 (2006.01)
CPC A61M 5/14244 (2013.01) [A61M 5/142 (2013.01); A61M 5/145 (2013.01); A61M 5/168 (2013.01); A61M 5/1723 (2013.01); A61M 39/24 (2013.01); A61M 5/1684 (2013.01); A61M 31/00 (2013.01); A61M 2005/14252 (2013.01); A61M 2230/201 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A liquid medicine injection device comprising:
a case;
a liquid medicine tank that is disposed in the case and where liquid medicine is received;
an electro-osmosis pump that is connected with the liquid medicine tank and moves the liquid medicine;
a needle assembly that receives the liquid medicine by being connected to the electro-osmosis pump and injects the received liquid medicine into a human body; and
an adhesive member combined to the case and configured to be attached to the human body,
wherein the liquid medicine injection device comprises a liquid medicine remaining amount checking portion, and the liquid medicine remaining amount checking portion comprises:
a first electrode plate received in the liquid medicine tank;
a second electrode plate that is received in the liquid medicine tank and disposed at distance from the first electrode plate; and
a detection sensor that senses capacitance that varies according to a remaining amount of the liquid medicine between the first electrode plate and the second electrode plate and transmits a sensed signal to a controller,
wherein the needle assembly comprises:
a knob;
a rotation member that rotates with rotation of the knob and provided with a locking protrusion portion in an internal wall thereof;
a moving member that is accommodated in the rotation member and moves in an axial direction or is fixed at a predetermined position by movement of the locking protrusion portion;
a needle combined to the moving member; and
a spring that is elastically supported between the rotation member and the moving member, and
wherein the moving member comprises:
a first locking groove portion that is supported by the locking protrusion portion and is provided at nearer side to the needle of an outer surface of the moving member;
a straight line guide groove portion that is connected with the first locking groove portion and provided at the outer surface of the moving member along an axial direction to guide the locking protrusion portion;
a slope guide groove portion that is connected with the straight line guide groove portion and provided at the outer surface of the moving member along a slope direction to guide the locking protrusion portion; and
a second locking groove portion that is connected with the slope guide groove portion and supported by the locking protrusion portion and is provided at nearer side to the needle of an outer surface of the moving member.