Cannulation system and related methods

• US 20030208097A1
• Filed: 11/15/2002
• Published: 11/06/2003
• Est. Priority Date: 06/18/1999
• Status: Abandoned Application

• Current Assignee: Bruce Baker, Kim L. Kosalek, Michael Guidera, Oʼconnell, Desmond, Sedig Noor, Walid N. Aboul-Hosn, William R. Kanz
• Original Assignee: Bruce Baker, Kim L. Kosalek, Michael Guidera, Oʼconnell, Desmond, Sedig Noor, Walid N. Aboul-Hosn, William R. Kanz
• Inventors: OʼConnell, Desmond, Baker, Bruce, Guidera, Michael, Kanz, William R, Aboul-Hosn, Walid N, Noor, Sedig, Kosalek, Kim L
• Application Number:
  US10/182,314
• Publication Number:
  US 20030208097A1
• Time in Patent Office: Days
• US Class Current: 600/16
• CPC Class Codes: A61B 2017/00243 cardiac
• CPC Class Codes: A61M 1/3653 Interfaces between patient blood circulation and extra-corporal blood circuit
• CPC Class Codes: A61M 1/3659 Cannulae pertaining to extracorporeal circulation
• CPC Class Codes: A61M 1/3666 Cardiac or cardiopulmonary bypass, e.g. heart-lung machines
• CPC Class Codes: A61M 60/104 Extracorporeal pumps, i.e. the blood being pumped outside the patient's body
• CPC Class Codes: A61M 60/232 Centrifugal pumps
• CPC Class Codes: A61M 60/414 transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter
• CPC Class Codes: A61M 60/419 the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
• CPC Class Codes: A61M 60/546 of blood flow, e.g. by adapting rotor speed
• CPC Class Codes: A61M 60/814 Volutes
• CPC Class Codes: A61M 60/859 Connections therefor

Abstract

The present disclosure involves a cannulation system (10) and related methods for augmenting the cardiac output of the heart during cardiac surgery.

Claims

1. A cannulation assembly for providing circulatory support during surgical procedures, comprising:

a pumping system including a centrifugal blood pump having an inlet and an outlet, a motor coupled to a controller, and a cable drive assembly extending between the motor and the blood pump for driving the blood pump according to control signals communicated from the controller to the motor; and

a cannula assembly defining a first flow path for transporting blood between the pump and a first predetermined location within the circulatory system of a patient, and a second flow path for transporting blood between the pump and a second predetermined location within the circulatory system of a patient.

2. The cannulation assembly of claim 1 and further, wherein the first and second flow paths of the cannula assembly are slideably coupled to one another and dimensioned to extend, in use, into the respective first and second predetermined locations through a single incision formed in the vascular system of the patient.

3. The cannulation assembly of claim 2, wherein the inlet and outlet of the first and second flow paths of the cannula assembly are disposed in a generally coaxial arrangement with the second flow path disposed at least partially within the first flow path.

4. The cannulation assembly of claim 1, wherein the cannula assembly and centrifugal blood pump are equipped with quick-connect fittings for coupling and decoupling the first flow path to the inlet of the centrifugal blood pump, and the second flow path to the outlet of the centrifugal blood pump.

5. The cannulation assembly of claim 1, wherein the centrifugal blood pump has a priming port for removing air from within the centrifugal blood pump in preparation for use.

6. The cannulation assembly of claim 5, wherein the priming port of the centrifugal blood pump is dimensioned to receive a syringe capable of withdrawing air from within the centrifugal blood pump.

7. The cannulation assembly of claim 1, wherein the cable drive assembly is dimensioned such that the centrifugal blood pump may be disposed at or within the sterile surgical field.

8. The cannulation assembly of claim 1, wherein the cable drive assembly includes a magnetic coupling dimensioned to be removably inserted into a lumen formed within a stator of the motor.

9. The cannulation assembly of claim 1, wherein the motor is coupled to the controller via an electrical cable dimensioned such that the motor may be disposed at or within the sterile surgical field.

10. The cannulation assembly of claim 1, wherein the controller includes a microcomputer programmed to regulate the speed of the motor.

11. The cannulation assembly of claim 10, wherein the controller controls the speed of the motor based on feedback from a flow rate monitoring device coupled to the centrifugal blood pump.

12. The cannulation assembly of claim 11, wherein the flow rate monitoring device is coupled to the inlet of the centrifugal blood pump.

13. The cannulation assembly of claim 10, wherein the controller includes a manual speed adjustment control such that an operator may cause the microcomputer to adjust the speed of the motor to a range of approximately 2500 RPM to 7500 RPM.

14. The cannulation assembly of claim 1, wherein the cannula assembly includes an inner cannula disposed within an outer cannula, the first flow path being defined between the exterior of the inner cannula and the interior of the outer cannula, the second flow path being defined within the interior of the inner cannula.

15. The cannulation assembly of claim 14, wherein the inner cannula includes a wire-reinforced elongated section having an open distal end and a non-reinforced clamping section, and wherein the outer cannula includes a main tubular section, a fluid inlet section, and a curved distal section having an open end.

16. The cannulation assembly of claim 15, wherein inner cannula is dimensioned to be slideably advanced through the outer cannula such that the open distal end of the inner cannula extends a distance from the open distal end of the curved distal section of the outer cannula.

17. The cannulation assembly of claim 16, wherein the outer cannula is dimensioned to be introduced into the heart such that the fluid inlet section is disposed within the right atrium and the curved distal section is disposed in the right ventricle.

18. The cannulation assembly of claim 17, wherein the curved distal section of the outer cannula is dimensioned to point in the general direction of the pulmonic valve such that the inner cannula may be slideably guided into the pulmonary artery after the outer cannula has been positioned within the heart.

19. A method for providing circulatory support, comprising:

providing a pumping system including a centrifugal blood pump having an inlet and an outlet, a motor coupled to a controller, and a cable drive assembly extending between the motor and the blood pump for driving the blood pump according to control signals communicated from the controller to the motor;

providing a cannula assembly defining a first flow path for transporting blood between the pump and a first predetermined location within the circulatory system of a patient, and a second flow path for transporting blood between the pump and a second predetermined location within the circulatory system of a patient; and

operating the control console to control the delivery of blood from the first predetermined location to the second predetermined location via the centrifugal blood pump.

20. The method for providing circulatory support of claim 19 and further, wherein the first and second flow paths of the cannula assembly are slideably coupled to one another and dimensioned to extend, in use, into the respective first and second predetermined locations through a single incision formed in the vascular system of the patient.

21. The method for providing circulatory support of claim 20, wherein the inlet and outlet of the first and second flow paths of the cannula assembly are disposed in a generally coaxial arrangement with the second flow path disposed at least partially within the first flow path.

22. The method for providing circulatory support of claim 19, wherein the cannula assembly and centrifugal blood pump are equipped with quick-connect fittings for coupling and decoupling the first flow path to the inlet of the centrifugal blood pump, and the second flow path to the outlet of the centrifugal blood pump.

23. The method for providing circulatory support of claim 19, wherein the centrifugal blood pump has a priming port for removing air from within the centrifugal blood pump in preparation for use.

24. The method for providing circulatory support of claim 23, wherein the priming port of the centrifugal blood pump is dimensioned to receive a syringe capable of withdrawing air from within the centrifugal blood pump.

25. The method for providing circulatory support of claim 19, wherein the cable drive assembly is dimensioned such that the centrifugal blood pump may be disposed at or within the sterile surgical field.

26. The method for providing circulatory support of claim 19, wherein the cable drive assembly includes a magnetic coupling dimensioned to be removably inserted into a lumen formed within a stator of the motor.

27. The method for providing circulatory support of claim 19, wherein the motor is coupled to the controller via an electrical cable dimensioned such that the motor may be disposed at or within the sterile surgical field.

28. The method for providing circulatory support of claim 19, wherein the controller includes a microcomputer programmed to regulate the speed of the motor.

29. The method for providing circulatory support of claim 28, wherein the controller controls the speed of the motor based on feedback from a flow rate monitoring device coupled to the centrifugal blood pump.

30. The method for providing circulatory support of claim 29, wherein the flow rate monitoring device is coupled to the inlet of the centrifugal blood pump.

31. The method for providing circulatory support of claim 28, wherein the controller includes a manual speed adjustment control such that an operator may cause the microcomputer to adjust the speed of the motor to a range of approximately 2500 RPM to 7500 RPM.

32. The method for providing circulatory support of claim 19, wherein the cannula assembly includes an inner cannula disposed within an outer cannula, the first flow path being defined between the exterior of the inner cannula and the interior of the outer cannula, the second flow path being defined within the interior of the inner cannula.

33. The method for providing circulatory support of claim 32, wherein the inner cannula includes a wire-reinforced elongated section having an open distal end and a non-reinforced clamping section, and wherein the outer cannula includes a main tubular section, a fluid inlet section, and a curved distal section having an open end.

34. The method for providing circulatory support of claim 33, wherein inner cannula is dimensioned to be slideably advanced through the outer cannula such that the open distal end of the inner cannula extends a distance from the open distal end of the curved distal section of the outer cannula.

35. The method for providing circulatory support of claim 34, wherein the outer cannula is dimensioned to be introduced into the heart such that the fluid inlet section is disposed within the right atrium and the curved distal section is disposed in the right ventricle.

36. The method for providing circulatory support of claim 35, wherein the curved distal section of the outer cannula is dimensioned to point in the general direction of the pulmonic valve such that the inner cannula may be slideably guided into the pulmonary artery after the outer cannula has been positioned within the heart.