For medical and legal reasons, the vendors across North America and even Europe are not making devices that cannot be cut off. In a medical emergency, they are all under legal liabilities. They make it so that the devices, while robust and not easily taken apart, can nonetheless be removed in a medical emergency.
You need the compliance of the individual to work with this technology. They need to avoid cutting it off, and they need, in some cases, to interact with the equipment every day to recharge it.