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Syringe siliconization process investigation and optimization.

Edwin Chan1, Aaron Hubbard, Samir Sane

  • 1Pharmaceutical Processing and Technology Development, Genentech, a member of Roche Group.

PDA Journal of Pharmaceutical Science and Technology
|April 12, 2012
PubMed
Summary
This summary is machine-generated.

This study details a new bench-top unit for precise syringe siliconization, optimizing silicone coating for prefilled syringes. The developed process ensures uniform silicone distribution, crucial for autoinjector performance and drug delivery.

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Area of Science:

  • Pharmaceutical Manufacturing
  • Materials Science
  • Mechanical Engineering

Background:

  • Prefilled syringes require precise interior barrel lubrication (siliconization).
  • Syringe siliconization is a complex, automated process often considered proprietary 'know-how'.
  • Published details on critical parameters and optimization are scarce, hindering process development.

Purpose of the Study:

  • To develop and optimize a bench-top siliconization unit with nozzle diving capabilities.
  • To identify critical process parameters for uniform silicone coating.
  • To demonstrate the transferability of optimized conditions to a pilot-scale system.

Main Methods:

  • Designed a bench-top unit with a liquid dispense pump and a linear actuator-integrated nozzle.
  • Quantified silicone coating by pre- and post-siliconization weighing.
  • Assessed silicone distribution via visual inspection (glass powder) and glide force testing.
  • Investigated nozzle spray range, retraction speed, silicone amount, and air pressure as key parameters.

Main Results:

  • Identified optimal conditions for low silicone dosage (~0.2 mg) on 1 mL long syringes.
  • Achieved uniform silicone distribution, critical for preventing autoinjector stalling.
  • Pilot-scale unit showed improved control (reduced standard deviation) due to minimized tubing flex.
  • Bench-top unit demonstrated successful siliconization applicable to larger scales.

Conclusions:

  • The developed bench-top siliconization unit successfully coats syringes with precise, uniform silicone layers.
  • Optimized parameters are crucial for consistent performance, especially at low silicone doses.
  • The findings are applicable to pilot-scale and potentially larger manufacturing settings, improving prefilled syringe production.