Abstract: A light-weight hyperbaric oxygen therapy hood assembly comprising a neckdam and hood having a gas inlet and outlet. The neckdam comprises a diaphragm which can be varied from an open to a closed condition for sealing of the neckdam around the neck of the patient, the diaphragm being concentric to the hood and neckdam. An inflatable bladder is providable at the back of the hood. A check valve is affixable to the gas outlet of the hood.

Abstract: An over-pressure protection device utilized for limiting the fluid pressure applied to a vein which has been removed from the body and which is being tested prior to transplantation within the body. The over-pressure protection device has a port for accepting a fluid under pressure, a tapered fitting for connection of the device to the vein to be tested and a resilient membrane which regulates the pressure of the fluid being applied to the vein. The specific characteristics of the resilient membrane limits the fluid pressure applied to the vein and therefore prevents subsequent deterioration of the vein.