Nanotechnology has nothing to do with blood circulation and pulse.
Please note that nanotechnology is still a new technology and its application scope is still very narrow. Almost all nano-concept commodities in China market are fooling consumers.
Such as nano antibacterial materials.
The concept of nano antibacterial materials is very novel. Nanofibers are used to pierce the cell wall of bacteria and kill them.
However, nano antibacterial materials have a very big disadvantage. It can't distinguish human cells from bacteria, that is, it kills all human cells that come into contact with it while killing bacteria.
As far as I know, many laboratories in Europe and America are looking for a kind of nanofiber that can pierce the cell wall of bacteria without harming human cells. Unfortunately, I haven't heard of it so far.
In other words, all nano antibacterial materials in China market are killed by bacteria and humans.
Only in China can this nano antibacterial material be publicly sold in the market.
The others are similar. Most of the nano-concept goods on the market are fools.