LIQUID MEDICINE INJECTION APPARATUS
An apparatus for infusing medical liquid may include: a base body, a needle assembly mounted on the base body, a reservoir unit fluidly connected to the needle assembly and having a plunger therein, a driving unit including a rod, which is connected to the plunger and moves along the reservoir unit, and a driving wheel, which has a protrusion and transmits driving force to the rod, and a connection member disposed between the rod and the driving wheel and having a guide groove for guiding the movement of the protrusion.
1 . An apparatus for infusing medical liquid, the apparatus comprising:
a base body,
a needle assembly mounted on the base body,
a reservoir unit fluidly connected to the needle assembly and having a plunger therein,
a driving unit including a rod that is connected to the plunger and moves along the reservoir unit, and a driving wheel that transmits a driving force to the rod and has a protrusion, and
a connection member disposed between the rod and the driving wheel and having a guide groove that guides movement of the protrusion.
2 . The apparatus for infusing medical liquid of claim 1 , wherein the connection member comprises a trap groove extending from the guide groove in a circumferential direction of the connection member.
3 . The apparatus for infusing medical liquid of claim 2 , wherein the trap groove extends in a rotational direction of the driving wheel.
4 . The apparatus for infusing medical liquid of claim 2 , wherein the trap groove is disposed in a plural number along a lengthwise direction of the connection member.
5 . The apparatus for infusing medical liquid of claim 1 , wherein when medical liquid is injected into the reservoir unit, the connection member is inserted into an interior of the driving wheel while passing through the protrusion.
6 . The apparatus for infusing medical liquid of claim 2 , wherein when the driving wheel rotates, the protrusion is caught by the trap groove, thereby coupling the driving wheel and the connection member to each other.
7 . The apparatus for infusing medical liquid of claim 6 , wherein when the driving wheel rotates further, the connection member and the driving wheel rotate together to move the rod forward.
8 . The apparatus for infusing medical liquid of claim 2 , wherein the trap groove has
a first side wall disposed at a portion thereof connected to the guide groove and guiding movement of the protrusion, and
a second side wall connected to the first side wall and supporting the protrusion.
9 . The apparatus for infusing medical liquid of claim 1 , wherein the connection member has
a first portion adjacent the plunger, and
a second portion connected to the first portion and having a smaller diameter than the first part,
wherein the guide groove is disposed at the first portion.
10 . The apparatus for infusing medical liquid of claim 1 , wherein the protrusion protrudes from an inner peripheral surface of the driving wheel.