Abstract: A platelet rich plasma (PRP) obtaining device includes a container attached to a receptacle for allowing a material in the receptacle to flow into the container, a piston engaged in the receptacle for forcing the material to partially flow into the container, a housing slidably engaged in the container and having a space and having a tube extended in the housing, the tube includes a bore communicating with a compartment of the container, but offset from the space of the housing, and a check valve is attached to the housing for limiting the material to flow only from the container to the housing, and for preventing the material from flowing backward from the housing into the container.

Abstract: A sputum collecting device includes a bag attached to a cover and disposed in a container for receiving and collecting a sputum and for forming a peripheral space between the container and the bag, the cover includes an inlet for guiding the sputum from a patient into the bag and includes a tubular member communicative with the container and the peripheral space that is formed between the container and the bag, and a vacuuming source for drawing the air in the bag and the peripheral space that is formed between the container and the bag, and for drawing the sputum through the inlet of the cover and into the bag, and then for collecting the sputum in the bag.

Abstract: A syringe includes a needle secured to one end of a barrel by a coupler which has a check valve engaged in the barrel. A housing is secured to the barrel. The check valve may prevent the blood from flowing through the coupler when the housing is disengaged from the barrel. The coupler includes a tip. The check valve includes a sleeve engaged on the tip of the coupler and having a resilience for clamping the tip and for blocking the coupler. A piston is slidably engaged in the housing for vacuuming the housing and for drawing blood into the housing via the needle and the coupler.