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In page Autoinjector:

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Automatic syringes have existed since the 1910s,[1] and many spring-loaded devices with needle protectors were patented in the first half of the 20th century.[2] But it was not until 1970s when they became economically feasible to mass-produce (simple syrettes were used instead before).[citation needed] In 2023 an open source autoinjector was developed that could be digitally replicated with a low cost desktop 3D printer.[3] It was tested against the then current standard (ISO 11608–1:2022)[4] for needle-based injection systems and found to cost less than mass manufactured systems.[3]