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Study: Contraceptive jewellery could make preventing pregnancy
Contraceptive patches are also already available, but Prausnitz believes pairing them with jewellery may prove attractive to some women and allow more discreet use of the drug delivery technology.
Researchers tested the concept on animal models, first on ears from pigs. Test patches mounted on earring backs and containing the hormone levonorgestrel were also applied to the skin of hairless rats.
To simulate removal of the earrings during sleep, they applied the patches for 16 hours, and then removed them for eight hours.
Testing suggested that even though levels dropped while the earrings were removed, the patch could produce necessary amounts of the hormone in the bloodstream.
The earring patch tested by the researchers consisted of three layers. One layer is impermeable and includes an adhesive to hold it onto an earring back, the underside of a wristwatch or the inside surface of a necklace or ring.
A middle layer of the patch contains the contraceptive drug in solid form. The outer layer is a skin adhesive to help stick to skin so the hormone can be transferred.
Once in the skin, the drug can move into the bloodstream and circulate through the body.
If the technique ultimately is used for contraception in humans, the earring back would need to be changed periodically, likely on a weekly basis.
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