Intravascular rotary blood pump
An intravascular rotary blood pump possesses a catheter ( 10 ), a pumping device ( 50 ) disposed distally of the catheter and having at its distal end a flexible flow cannula ( 53 ) through which blood is either sucked or discharged by the pumping device ( 50 ) during operation of the blood pump, and at least one pressure sensor ( 27, 28 A, 30 ) having at least one optical fiber ( 28 A) which is laid along the flow cannula ( 53 ). The optical fiber ( 28 A) and, where applicable, a sliding tube ( 27 ) in which the optical fiber ( 28 A) is laid extend along a neutral fiber of the flow cannula ( 53 ).
1. An intravascular rotary blood pump, comprising a catheter ( 10 ), a pumping device ( 50 ) disposed distally of the catheter ( 10 ) and having at its distal end a flexurally flexible flow cannula ( 53 ) through which blood is either sucked or discharged by the pumping device ( 50 ) during operation of the blood pump, and at least one pressure sensor ( 27 , 28 A, 30 ) having at least one optical fiber ( 28 A), characterized in that the optical fiber ( 28 A) is laid along a neutral fiber of the flow cannula ( 53 ).
2. The blood pump according to claim 1 , wherein the neutral fiber is preset by a precurvature of the flow cannula ( 53 ) and accordingly lies between an inner radius of curvature and outer radius of curvature of the flow cannula as defined by the precurvature.
3. The blood pump according to claim 1 , wherein the optical fiber ( 28 A) is bonded along the neutral fiber.
4. The blood pump according to claim 1 , wherein the optical fiber ( 28 A) is laid freely movably in a sliding tube ( 27 ) along the neutral fiber.
5. The blood pump according to claim 4 , wherein the sliding tube ( 27 ) extends along the flow cannula ( 53 ) on the outside.
6. The blood pump according to claim 4 , wherein an outer surface of the optical fiber ( 28 A) and an inner surface of the sliding tube ( 27 ) form a sliding material pairing of metal-metal, metal-plastic or plastic-plastic.
7. The blood pump according to claim 6 , wherein the plastic comprises polytetrafluoroethylene (PTFE).
8. The blood pump according to claim 4 , wherein the sliding tube ( 27 ) is formed from a material comprising a shape-memory alloy.
9. The blood pump according to claim 4 , wherein the sliding tube ( 27 ) is plastic-coated on the inside.
10. The blood pump according to claim 4 , wherein the optical fiber ( 28 A) has an outer metal coating ( 28 coat ).
11. The blood pump according to claim 4 , wherein the optical fiber ( 28 A) has an outer plastic coating ( 28 coat ) made of polytetrafluoroethylene (PTFE).
12. The blood pump according to claim 4 , wherein the sliding tube ( 27 ) is filled with liquid.
13. The blood pump according to claim 1 , wherein the optical fiber ( 28 A) comprises a glass fiber ( 28 core , 28 clad , 28 coat ).
14. The blood pump according to claim 1 , wherein the optical fiber ( 28 A) possesses a diameter of 130 μm or less.
15. The blood pump according to claim 1 , wherein the flow cannula ( 53 ) has an outer surface in which there is configured a depression ( 36 ) in which a distal end ( 30 ) of the pressure sensor is at least partly disposed.
16. The blood pump according to claim 1 , wherein the flexurally flexible flow cannula ( 53 ) has a soft-flexible tip ( 55 ) and wherein a distal end ( 30 ) of the pressure sensor is at least partly disposed in the soft-flexible tip ( 55 ).
17. The blood pump according to claim 1 , wherein a distal end ( 30 ) of the pressure sensor projects radially beyond the periphery of the flow cannula ( 53 ), and wherein there is provided on the flow cannula ( 53 ) distally before the distal end ( 30 ) of the pressure sensor a bulge ( 35 ) likewise projecting beyond the periphery of the flow cannula ( 53 ).