1. An injection catheter (1) used to deliver a therapeutic agent to a substrate (12) containing at least one cavity (14) and a curved delivery element (2) comprising a hollow tube, wherein said at least one cavity is made with the possibility of its use as a guide means for a curved feeding element (2) outside the substrate (12), the feeding element (2) contains holes (6) located on its distal tip (4), the adistal tip (4) contains a distal region ( 10) and the proximal region (8) characterized in that the specific surface of the holes (6) in the distal region (10) of the distal tip (4) of the curved feeding element (2) is larger than the specific surface of these holes in the proximal region (8) of the distal tip (4) of the curved feeding element (2 ) .2. A catheter according to claim 1, characterized in that the specific surface in the distal region (10) and in the proximal region (8) of the distal tip is from 0.01 to 0.25 mm / mm. A catheter according to claim 1 or 2, characterized in that the specific surface between the proximal region (8) and the distal region (10) is increased due to the increase in the average surface of the holes (6). 4. A catheter according to claim 1 or 2, characterized in that the specific surface between the proximal region (8) and the distal region (10) is increased due to an increase in the total surface of the holes. A catheter according to claim 1 or 2, characterized in that the specific surface between the proximal region (8) and the distal region (10) is increased due to an increase in the density of the holes (6) .6. The catheter according to claim 1 or 2, characterized in that it contains regulatory means for regulating the depth of pron1. Катетер (1) для инъекций, используемый для подачи терапевтического средства в субстрат (12), содержащий по меньшей мере одну полость (14) и изогнутый подающий элемент (2), представляющий собой полую трубку,причем указанная по меньшей мере одна полость выполнена с возможностью ее использования в
