Braking device for rat tail intravenous injection

The utility model discloses a braking device for intravenous injection of a mouse tail, which comprises a cylinder for accommodating a laboratory mouse, and is characterized in that a transparent area is arranged on the outer peripheral surface of the cylinder, a movable black shielding sheet is arranged in the transparent area, an open slot is arranged on one side of the transparent area, and the open slot is communicated with the open slot. And the shielding sheet can be turned outwards from the open slot. The utility model provides a braking device for intravenous injection at the tail of a mouse, which is characterized in that a laboratory mouse enters a full-shading device by using the light-proof darkness of the mouse; meanwhile, the shielding of the device can be uncovered, so that the position of the laboratory mouse in the device can be observed conveniently; the moving range of the laboratory mouse can be compressed by adjusting the depth of the mouse tail fixer entering the cylinder, so that the la