Intravascular blood pump with balloon

An intravascular blood pump for percutaneous insertion into a patient's blood vessel, comprising:

• a catheter,
• a pumping device attached to the catheter, the pumping device having a blood flow inlet, a blood flow outlet and a rotor so as to cause blood to flow from the blood flow inlet to the blood flow outlet,
• a ring seal disposed on the pumping device between the blood flow inlet and the blood flow outlet, the ring seal configured to assume a collapsed configuration and an expanded configuration and configured to contact and seal against an inner wall of the patient's blood vessel when inserted therein in the expanded configuration so as to separate a proximal area of the patient's blood vessel from a distal area of the patient's blood vessel, and
• a support member disposed inside the ring seal in order to support the ring seal from inside the ring seal, wherein the support member is configured to collapse at least partially when a predetermined pressure difference during operation of the intravascular blood pump between the proximal area of the patient's blood vessel and the distal area of the patient's blood vessel acts on the ring seal, wherein the support member withstands a pressure difference during operation of the intravascular blood pump between the proximal area of the patient's blood vessel and the distal area of the patient's blood vessel of up to 100 mmHg before it collapses, and
• wherein the support member comprises at least one elastic wire.