The internal diameter of a needle is the largest contributor of forces required to complete injection. The “HYDRO” system was developed to characterize the smallest internal diameter of needle non destructively with a high degree of precision and accuracy. The principle for the measurement is Poiseuille Flow.
A Hydro system is used in order to calculate the orifice size within a syringe needle. The system measures flow rate, temperature, and pressure in order to calculate the hydrodynamic diameter of the syringe needle.