Diagnostic and injection catheter, in particular for an application in cardiology

Catheter for injecting a therapeutic or diagnostic agent into an organ (0), in particular a heart, the catheter comprising:

• a flexible exterior tube (12) having a proximal end (14) and a distal end (16), inside which a needle (32) is mounted to slide axially between retracted and deployed positions in which a tip (34) of said needle (32), adapted to be inserted into said organ (O), is withdrawn inside said exterior tube (12) and projects from said distal end (16) of said exterior tube (12), respectively,
• actuation means adapted to slide said needle (32) between said retracted and deployed positions, and
• means (50) for fixing said catheter to said organ (0), said needle (32) being decoupled from said fixing means so that said needle (32) is able to slide relative to said fixing means, at least in an unfolded position of said fixing means (50), which catheter is characterized in that said fixing means (50) comprise a suction cup (62) mounted so that it may be retracted into a lumen (18) of said exterior tube (12).