In order to help “poor swimmers”, scientists developed “spermbots” that can deliver healthy sperm to an egg. The tiny metallic helices are just large enough to fit around the tail of a sperm. Their movements can be controlled by a magnetic field and lab testing showed they can deliver sperm to an egg for potential fertilization.
Cellular Cargo Delivery: Toward Assisted Fertilization by Sperm-Carrying Micromotors
Mariana Medina-Sánchez, Lukas Schwarz, Anne K. Meyer, Franziska Hebenstreit, and Oliver G. Schmidt
Nano Letters, DOI: 10.1021/acs.nanolett.5b04221