Drug Delivery
Autoinjector Housing & Drive
An autoinjector combines a structural housing, a stored-energy drive train, and a window to inspect the drug. Material selection balances impact resistance for drops, low-creep components that hold spring load over shelf life, and clarity for the inspection window.
Sterilization: Ethylene OxideGamma
Component material package
A recommended grade per component, drawn from the Nexeo catalog. Recommendations are engineering assessments; a cited property links the choice to data we hold for that grade.
| Component | Recommended grade | Why |
|---|---|---|
Outer housing Impact-resistant structural shell | Bayblend T65 XF Polycarbonate Blend (PC-ABS) | A PC-ABS blend delivers drop-impact resistance and a premium cosmetic finish for a hand-held device. |
Drug inspection window Clear viewing window | Makrolon Rx1805 Polycarbonate (PC) | A clear medical PC gives a rigid, high-clarity window that survives EtO and radiation. Cited: Light Transmission |
Drive / plunger carrier Low-creep component holding spring load | Zytel 101L NC010 Polyamide (PA66) | A PA66 resists creep under sustained spring load and gives reliable snap features. |
Trigger button overmold Tactile actuation surface | THERMOLAST M TM5MED Thermoplastic Elastomer (TPE) | A medical TPE overmold provides a defined tactile actuation surface and grip. |
Producer datasheetNexeo Applications Engineering assessmentAwaiting datasheetNot published by producer
Key regulatory requirements
- ISO 10993-1 (limited contact / device exterior)
- ISO 11608 needle-based injection systems
- USP Class VI on any drug-contacting surface
Engineering watch-outs
- Creep is the failure mode for stored-energy parts — qualify long-term load retention, not just short-term strength.
- Any drug-contact surface needs extractables/leachables data beyond biocompatibility.
- PA66 conditions to moisture; account for dimensional change between dry-as-molded and equilibrium.
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