Wickham Plastics has designed and developed an injection moulded plastic retractable safety syringe from a customer's concept sketch. The retractable safety syringe has a product function together with reliable and efficient production manufacture.
Significant innovation resulted in a patented product that after a single use, the inner barrel and needle retract inside the main barrel of the syringe and are securely locked in place, thus preventing needle stick injury and re-use of the syringe.
Key technical challenges that were overcome in the prototyping stage
- Unique limit catch design preventing premature retraction of the needle during the pre-fill stroke
- The engagement of moulded flexible fingers on the barrel, that upon the injection stroke, reverse the one-way lock mechanism to allow needle
- retraction at the same time preventing forward needle movement
The technology developed by Wickham has been successfully applied across all sizes of syringes.