Abstract: A pump that can be adjusted to vary the volumetric output of the pump. The pump has a flexible housing that defines an inner pump chamber. The flexible housing can be collapsed by the user to discharge the contents of the inner chamber. Integral with the housing is an outer spring that returns the pump to the original extended position when the housing is released by the user. The pump further includes one-way valves that allow air to flow into and out of the inner chamber. Wrapped around the housing is a belt that controls the extended volume of the inner chamber and the corresponding volumetric output of the pump. The belt can be adjusted to vary the size of the inner chamber and the volumetric output of the pump. The belt may have different settings that define the amount of air provided by the pump. When used as part of a resuscitator unit, the belt can be adjusted to match the volumetric output of the pump with the lung capacity of the patient.

Abstract: The disclosure relates to a collapsible flexible pump which includes an inflatable spring and framework. The inflatable spring framework is formed by attaching a layer of flexible material over selected exterior portions of the flexible material pumping chamber to form a passageway therebetween. Inflation of the inflatable spring framework via an inflation valve, results in the collapsed flexible pump distending into a three dimensional pumping chamber inscribed by the inflated spring framework. The pumping chamber includes appropriate inlet and discharge valves. By applying a compressive force to the pumping chamber, the volume of fluid within the pumping chamber is forced out through the discharge valve. The restoring tendency of the distended inflatable spring framework returns the pump chamber to the extended position on the returning intake stroke. A plurality of exemplary inflatable articles are disclosed.