Abstract: Method for regulating hyperbaric chamber pressure at a prescribed level while a continuous supply of fresh gas flows into the hyperbaric chamber. Apparatus consists of a hermetically sealed pressure vessel plenum with a cavity that contains a gas regulating device. Sealed pressure piping means connects the gas regulating device intake to a hyperbaric chamber port. Sealed pressure piping means connects the gas regulating device vent though the plenum housing to the atmosphere. The plenum cavity has a port with a valve through which sealed piping means receives gas pressure from the hyperbaric chamber. Convenient management of hyperbaric chamber pressure at a determined pressure level can occur with closure of plenum valve during hyperbaric chamber pressurization. After closure of plenum valve any additional gas flow into hyperbaric chamber will vent through the gas regulating apparatus.

Abstract: A shoe heel having rollers (20) arranged on multiple axles (18) each aligned with its longitudinal axis pointed toward the center of the shoe (16) sole. The rollers are mounted in a durable housing (14) open along its bottom with the rollers projecting out from the housing. The axles are secured along the bottom of a higher rear plate (10) and a shorter front plate (12) to maintain even contact of the rollers against a walking surface.