A catheter device comprising: an elongate catheter having a proximal end, a distal end, at least one inflow lumen, at least one outflow lumen and a longitudinal axis; a first tube having a proximal end and a distal end, said first tube being coiled in a series of elongated loops each of which has a first length axis and a first width axis, the first length axis being longer than the first width axis; a second tube having a proximal end and a distal end, said second tube being coiled in a series of elongated loops each of which has a second length axis and a second width axis, the second length axis being longer than the second width axis; at least one elongated loop of the first tube being positioned so that it extends around a section of the catheter such that its first length axis is transverse to the longitudinal axis of the catheter, wherein the first length axis is perpendicular to the first width axis; and at least one elongated loop of the second tube being positioned such that it extends around said section of the catheter with its second length axis transverse to the longitudinal axis of the catheter, wherein the second length axis is perpendicular to the second width axis, and wherein the second length axis of at least one elongated loop of the second tube is substantially perpendicular to the first length axis of said at least one elongated loop of the first tube; wherein the first and second tubes (30a, 30b) are connected to the inflow and outflow lumens (15a, 15b) such that a fluid will circulate in the inflow lumen, through said first and second (30a, 30b) tubes and out of the outflow lumen. an elongate catheter having a proximal end, a distal end, at least one inflow lumen, at least one outflow lumen and a longitudinal axis; a first tube having a proximal end and a distal end, said first tube being coiled in a series of elongated loops each of which has a first length axis and a first width axis, the first length axis being longer than the first width axis; a second tube having a proximal end and a distal end, said second tube being coiled in a series of elongated loops each of which has a second length axis and a second width axis, the second length axis being longer than the second width axis; at least one elongated loop of the first tube being positioned so that it extends around a section of the catheter such that its first length axis is transverse to the longitudinal axis of the catheter, wherein the first length axis is perpendicular to the first width axis; and at least one elongated loop of the second tube being positioned such that it extends around said section of the catheter with its second length axis transverse to the longitudinal axis of the catheter, wherein the second length axis is perpendicular to the second width axis, and wherein the second length axis of at least one elongated loop of the second tube is substantially perpendicular to the first length axis of said at least one elongated loop of the first tube; wherein the first and second tubes (30a, 30b) are connected to the inflow and outflow lumens (15a, 15b) such that a fluid will circulate in the inflow lumen, through said first and second (30a, 30b) tubes and out of the outflow lumen.