RHINAL SPRAY NOZZLE USED FOR MEDICAL SYRINGE

摘要

The purpose of the present invention is to achieve intended spray characteristics when spraying a pharmaceutical formulation with prescribed characteristics using a nasal spray nozzle that is used in a metered dose syringe sprayer. The present invention relates to a nasal spray nozzle that is used in a medical syringe with a tip opening, which is in fluid communication with a syringe barrel that is holding a pharmaceutical formulation. The nasal spray nozzle is characterized in: being provided with a hollow nozzle body with a tip in which a nozzle spray hole is formed, a solid filling rod disposed inside the nozzle body, and a nozzle chamber, which is formed between the filling rod and the nozzle body and which allows fluid communication between the tip opening and the nozzle spray hole; the pharmaceutical formulation containing a gel base, which includes a carboxyvinyl polymer and a viscosity modifier and the viscosity of which has been modified by applying an external shearing force; and the nozzle spray hole having a diameter of 0.25 mm - 0.30 mm.