Medical apparatus for applying a pumping action to the foot

A medical device is provided for applying compressive pressures against a patient's foot. The device comprises first and second panels (32,34) of flexible material secured to one another to form an inflatable bag (30) to be fitted upon the foot. The bag (30) has first and second separate fluid bladders (36,38). The first fluid bladder (36) is adapted to engage a first portion of the foot and the second fluid bladder (38) is adapted to engage a second portion of the foot. A boot (20) is provided for holding the inflatable bag (30) to the foot. A fluid supply is provided for applying pressurized fluid to the first and second fluid bladders (36,38) such that the first fluid bladder (36) applies a first compressive pressure upon the first portion of the foot and the second fluid bladder (38) applies a second compressive pressure upon the second portion of the foot. A safety vent (200) is associated with one of the inflatable bag (30) and the fluid supply.