Ophthalmic suspensions containing viscous polymer vehicles often form sticky droplets at nozzle tips during high-speed dispensing, leading to neck thread contamination and cap torque defects. Here is how Vedax Pharma Mach solved the dispensing challenge.
Positive Pneumatic Shutoff Dispensing Needles
Standard open-orifice nozzles rely solely on surface tension to break fluid contact, which fails when dispensing viscous ophthalmic emulsions.
Internal Needle-Actuated Shutoff Mechanism
Vedax engineered custom pneumatic shutoff needles featuring internal spring-return shutoff pins that seat flush against the nozzle tip, snapping fluid flow shut instantaneously.
Eliminating Exterior Neck Thread Contamination
By eliminating droplet hang-up and dripping, 100% of container necks remained dry, ensuring tamper-evident cap sealing torque complied with USP standards.
Viscosity-Matched Hydrodynamic Geometry
Fluid passage design plays a pivotal role in preventing shear-induced polymer degradation.
CFD-Optimized Fluid Delivery Profile
The internal nozzle bore was contoured using computational fluid dynamics to eliminate recirculation eddies and prevent particulate crystallization around the orifice.
Passivated SS 316L Fluid-Contact Tooling
Components were machined from certified SS 316L and electropolished to Ra ≤ 0.15 µm to prevent product adherence and foaming.
Validation & Cleanability
Aseptic filling lines require comprehensive qualification for rapid clean-in-place (CIP) and steam-in-place (SIP) cycles.
Riboflavin Fluorescence Rinse Testing
The complete needle and manifold assembly underwent rigorous riboflavin cleanability verification, confirming zero residual buildup under UV inspection.
Validated Dosing Accuracy: ±0.35%
Production batch testing confirmed repeatable micro-dosing accuracy within ±0.35%, substantially surpassing the ±1.0% regulatory requirement.