Syringe Extension

A company using an expensive two stage assembly for a cartridge used to contain their drug compound asked Sovrin to devise a one piece answer to improve the storage life of the product, whilst offering a cost reduction.


  • Inherent technical problems with the existing design
  • Problems in dosing the adhesive used in the original assembly
  • Shut-off on substrate part with dimensional variation was critical
  • Polymer selection dictated by the need for a strong bond with substrate
  • Very high pull force testing requirement


  • One-piece component design developed
  • Use of adhesive eliminated
  • Tool design developed to cope with inconsistent substrate
  • Suitable polymer identified and successfully tested