Speciality Orthopaedic Syringe

A company with a requirement for a unique design of syringe for delivery of their novel product asked plastic injection moulding specialists Sovrin to conduct a DFM, manufacture mould tools and provide volume injection moulding and assembly.


  • Specialised design called for more challenging polymers and tool design
  • Capability for sterilisation by ETo
  • Total oxygen barrier required for drug compatibility
  • Zero draft in syringe bore
  • Tight tolerances
  • Flow patterns studied by Moldflow to overcome difficulties created by product design
  • Soft-touch overmould required
  • Functional seal feature to be overmoulded


  • Suitable specialist polymer identified and successfully tested
  • Tool design proved by capability studies & verification protocols
  • Results of Moldflow analysis incorporated into tool design
  • Elastomers compatible with overmoulding identified and successfully tested
  • Product developed to clinical trial readiness