A device for controlling blood perfusion pressure within a vessel, the device comprising: an elongated body having a lumen, a proximal end that comes into contact with an area having a high blood pressure, and a distal end that comes into contact with an area having a low blood pressure; and a stenosis positioned within the lumen of the elongated body and between the proximal end and the distal end; wherein: either (a) the stenosis is a resorbable stenosis and is resorbed in time by blood flow from the proximal end to the distal end, or (b) the stenosis is a partial occluder comprising a balloon configured to be intially filled to partially occlude the lumen so as to effect arterialisation of the vessel and then deflated or removed after a period of time, thereby gradually equalizing the blood pressure at the area at the distal end with the blood pressure at the area at the proximal end; characterised in that the device further comprises an anchoring balloon configured to anchor the elongated body within part of a circulatory system; and wherein the lumen is designed to provide an optimal stenosis geometry to ensure undisturbed flow in the vessel. the device comprising: an elongated body having a lumen, a proximal end that comes into contact with an area having a high blood pressure, and a distal end that comes into contact with an area having a low blood pressure; and a stenosis positioned within the lumen of the elongated body and between the proximal end and the distal end; wherein: either (a) the stenosis is a resorbable stenosis and is resorbed in time by blood flow from the proximal end to the distal end, or (b) the stenosis is a partial occluder comprising a balloon configured to be intially filled to partially occlude the lumen so as to effect arterialisation of the vessel and then deflated or removed after a period of time, thereby gradually equalizing the blood pressure at the area at the distal end with the blood pressure at the area at the proximal end; characterised in that the device further comprises an anchoring balloon configured to anchor the elongated body within part of a circulatory system; and wherein the lumen is designed to provide an optimal stenosis geometry to ensure undisturbed flow in the vessel. an elongated body having a lumen, a proximal end that comes into contact with an area having a high blood pressure, and a distal end that comes into contact with an area having a low blood pressure; and a stenosis positioned within the lumen of the elongated body and between the proximal end and the distal end; wherein: either (a) the stenosis is a resorbable stenosis and is resorbed in time by blood flow from the proximal end to the distal end, or (b) the stenosis is a partial occluder comprising a balloon configured to be intially filled to partially occlude the lumen so as to effect arterialisation of the vessel and then deflated or removed after a period of time, thereby gradually equalizing the blood pressure at the area at the distal end with the blood pressure at the area at the proximal end; characterised in that the device further comprises an anchoring balloon configured to anchor the elongated body within part of a circulatory system; and wherein the lumen is designed to provide an optimal stenosis geometry to ensure undisturbed flow in the vessel.