The sharpness of the tungsten needle tip can affect its ability to inject drugs into tissues. A sharper needle tip can penetrate tissue with less force, reducing tissue damage and increasing the accuracy of drug delivery. However, an excessively sharp needle can also cause damage to tissue by shearing or tearing, leading to bleeding or tissue trauma. Therefore, a balance between sharpness and tip diameter is required for optimal drug delivery performance of tungsten needles. Additionally, the surface coating and biocompatibility of the tungsten needle can also affect its ability to inject drugs into tissues without causing adverse reactions or tissue damage.
