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Contraceptive implant.
See table under ‘Effectiveness’:
https://en.wikipedia.org/wiki/Comparison_of_birth_control_methodsTypical use failure rate during first year:
- contraceptive implant 0.05%
- vasectomy 0.15%
- IUD 0.8%
- pill 7%
- male condom 13%
So yeah, an IUD “spiral”. AKA “coil” as they are apparently called in English.