Rabbi Yaakov Ariel has issued a groundbreaking halachic ruling published in the Tehumin journal, permitting the use of advanced bionic prosthetic limbs for religious rituals such as wrapping tefillin, waving the Four Species on Sukkot, and reciting the Priestly Blessing. The ruling recognizes these prosthetics, which operate through sensors and motors synchronized with the user's body, as an extension of the human body according to Jewish law. Additionally, Rabbi Ariel allows their use on Shabbat, stating that their operation does not violate Torah prohibitions due to their indirect activation. The decision is seen as a significant step in adapting religious practice to modern technological advancements, particularly benefiting wounded soldiers and terror victims. The Zomet Institute, which published the ruling, highlights this as part of a broader movement to integrate new medical and technological realities into halachic practice.