Drug injection device for heart failure

A drug injection device for heart failure, comprising a delivery catheter (1) and an abutting component (2) disposed at one end of the delivery catheter (1), wherein a plurality of guide holes (3) are formed in the abutting component (2), a reservoir tube (4) is slidably connected in the delivery catheter (1), a plurality of injection needles (5) in communication with the reservoir tube (4) are disposed at one end of the reservoir tube (4) close to the abutting component (2), the plurality of injection needles (5) are slidably inserted in the plurality of guide holes (3) respectively in one-to-one correspondence, a sealing plate (6) is rotatably connected in an inner wall of one end of the reservoir tube (4) close to the injection needle (5), the sealing plate (6) is perforated with a plurality of connecting holes (7) in one-to-one correspondence to the plurality of injection needles (5), the reservoir tube (4) is provided with an opening at one end away from the sealing plate (6), a tube plug (8) is rotatably connected to the reservoir tube (4) at the opening, a limiting ring (9) connected to the tube plug (8) is fixedly connected to an inner wall of the delivery catheter (1) close to the tube plug (8), an injection assembly is disposed on the tube plug (8), and a connecting assembly is disposed between the injection assembly and the sealing plate (6);

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• the injection assembly comprises an injection tube (10) slidably extending through the tube plug (8), a movable tube (11) is in threaded connection to an outer side of one end of the injection tube (10) towards the reservoir tube (4), a positioning ring (12) is connected to an outer side of the movable tube (11) close to the reservoir tube (4), an end of the movable tube (11) is fixedly connected to an injection piston (13), a liquid inlet hole (14) in communication with the injection tube (10) is formed in a center of the injection piston (13), a plurality of clamping blocks (15) are fixedly connected around an inner wall of the reservoir tube (4) close to the sealing plate (6), a plurality of clamping slots (16) matched with the clamping blocks (15) are formed around a side of the injection piston (13) towards the sealing plate (6), an administration tube (17) is detachably connected to one end of the injection tube (10) away from the injection piston (13), a first check valve (18) is mounted on the administration tube (17), a balance tube (19) sequentially extending through the tube plug (8) and the injection piston (13) is disposed above the injection tube (10), one end of the balance tube (19) away from the injection piston (13) communicates with a connecting tube (20), an outer side of the connecting tube (20) is fixedly connected to a second check valve (21), and an opening of the connecting tube (20) is adapted to a syringe.