There is provided a protected needle assembly. The assembly includes an outer barrel receiving a needle therethrough. The assembly includes an inner barrel resiliently biased to extend about the needle in a protected needle mode. The inner barrel is retractable into the outer barrel in a first instance to deploy the needle. The assembly includes a locking mechanism actuated upon the inner barrel moving towards the protected needle mode once more. The locking mechanism is configured to inhibit further retraction of the inner barrel thereafter.