A Stasis Disk is a device developped by the International Temporal Enforcement Agency that is capable of delivering a large amount of Type-7 to a target an ensure it doesn't eventually pass out of their system.
The disks are palm sized and somewhat resemble hockey pucks, being black and coated in flexible rubber. At the center of one side is a silver ring which, upon making contact with a surface, deploys a small needle and an adhesive, attaching and injecting the target with enough Type-7 to freeze them for three hours. The device also uses the needle to regulate Type-7 within the target's body, ensuring that it doesn't pass through its body as fast as it normally would, turning the three hours into roughly two days, and even then the last of a Type-7 dose will never leave the subject's body so long as the disk is attached.
The concept was first proposed by Takahishi Nakamura and developped by both him and Marika Heino, with some additional input from Mary Hamilton. The idea was to have a sort of Type-7 handcuff device, guaranteed to immobilize a prisoner until removed and, unlike a Type-7, able to be applied anywhere on the body and still work at full effect. The rubber shell was devised to make them more flexible and protect them from Electro-Static Rounds, essentially forcing someone to actually remove them to disable them. The original plan was for the chip to ensure the decay of Type-7 within the target's body was even slower than two days, but worries about violating certain laws led to the standard limit.