The needle is sharpened to a wedge shape, with the tip on the right, assuming it is viewed from the side. Let's divide the process of the needle entering the flesh into 3 segments.
The first segment has only the tip on the right, and since the tip is flanked on both sides by steel needles, the flesh is separated directly.
The second segment begins with the right side of the wall, and since the left side of the wall gradually appears, the meat is held apart by the sides of the wall, like a leather band around your index finger and thumb, and the middle portion is separated. Due to the elasticity of the meat on the left side and the lack of steel support in the center, the meat goes in slightly towards the hollow part of the tube on the right side, creating an arc where the meat has sunk into the syringe when viewed from the side. This is the part of the problem that seems reasonable. In the front view, the beveled port is inserted until it reaches the halfway point, when the cleft reaches its maximum diameter, the curvature is at its maximum, and the meat is sunk in the deepest when viewed from the side. But when stabbing further down from here, it's all like a replay again, and the cleft starts to slowly get smaller again, so the arc gets smaller and smaller, and eventually the arc disappears and the meat is pushed out of the cut.
In the third section, the meat comes to where both the left and right canal walls are present, and here the meat goes up against the left and right canal walls.
So in the end the meat just gets a cut, but it doesn't enter the syringe to appear as a tube of meat.