Is it permissible for a woman to undergo a tubal ligation to prevent pregnancy after her seventh delivery, given her severely deteriorated health and need for a crutch, and with her husband's consent?

The default ruling is that it is impermissible to permanently cease procreation. However, if it is medically confirmed by a trustworthy Muslim physician that pregnancy poses a danger to your life or a significant harm, then there is no objection to a tubal ligation to prevent pregnancy. The procedure should be performed by a competent female doctor, if available.