medical apparatus, namely, an ex-vivo blood pump, impulse generator and controls therefor, sold as a unit, used for the enhancement of blood circulation; reduction of post-operative and post-traumatic pain and swelling; for the reduction of compartmental pressures to avoid fasciotomy and associated complications; for pre-operative and post-operative prohylaxis of deep vein thrombosis; for the treatment of sudeck's syndrome (reflex sympathetic dystrophy); for maintaining patency and reducing edema in high-risk limb bypass grafts; i.e., femorodistal tibial graft; for a reduction in rest pain and maintenance of circulation in patients awaiting surgery; for the stimulation of circulation in peripheral vascular disease in the critically ischaemic limp to maintain limb viability; for the treatment of exacerbations of raynaud's disease; for the stimulation of circulation in patients at risk of developing ischaemic ulceration (diabetes, etc.); for the enhancement of blood supply prior to grating; and for the treatment of venous ulceration and in the avoidance of recurrence