Implantable pump system having a rectangular membrane
An implantable pump system is provided, including an implantable blood pump suitable for use as a partial support assist device, the system further including an extracorporeal battery and a controller coupled to the implantable pump, and a programmer selectively periodically coupled to the controller to configure and adjust operating parameters of the implantable pump. The implantable pump includes a flexible membrane coupled to an electromagnetic actuator including a magnetic assembly and electromagnetic assembly, so that when the electromagnetic assembly is energized, the electromagnetic assembly causes wavelike undulations to propagate along the flexible membrane to propel blood through the implantable pump. The controller may be programmed by a programmer to operate at frequencies and duty cycles that mimic physiologic flow rates and pulsatility while operating in an efficient manner that avoids thrombus formation, hemolysis and/or platelet activation.
1. A method for pumping blood comprising:
activating a first electromagnetic coil and a second electromagnetic coil disposed within a pump housing to simultaneously induce a first current in the first electromagnetic coil and a second current in the second electromagnetic coil, the first electromagnetic coil and the second electromagnetic coil oriented with respect to a magnetic assembly disposed in the pump housing such that the magnet assembly is disposed between the first electromagnetic coil and the second electromagnetic coil;
wherein, the first current and the second current interact with a magnetic field generated by the magnetic assembly to excite a rectangular membrane coupled to the magnetic assembly thereby inducing a wave-like deformation in the rectangular membrane to pump blood from an inlet of the pump housing, along the rectangular membrane, and out an outlet of the pump housing.
2. The method of claim 1 , wherein the first current and the second current are oriented in a direction to cause an attraction between the magnetic assembly and at least the first electromagnetic coil.
3. The method of claim 1 , wherein the first current and the second current cause the magnetic assembly coupled to the rectangular membrane to move from a first position to a second position to induce the wave-like deformation in the rectangular membrane.
4. The method of claim 3 , further comprising, after activating the first electromagnetic coil and the second electromagnetic coil to simultaneously induce the first current in the first electromagnetic coil and the second current in the second electromagnetic coil, activating the first electromagnetic coil and the second electromagnetic coil to simultaneously induce a third current in the first electromagnetic coil and a fourth current in the second electromagnetic coil, the third current opposite the first current and the fourth current opposite the second current.
5. The method of claim 4 , wherein the third current and the fourth current cause the magnetic assembly coupled to the rectangular membrane to move from the second position back to the first position.
6. The method of claim 1 , further comprising ceasing activation of the first electromagnetic coil and the second electromagnetic coil to cause the magnetic assembly to return to a neutral position.
7. The method of claim 1 , wherein, the first current and the second current interact with the magnetic field generated by the magnetic assembly to excite the rectangular membrane by causing the magnetic assembly to move from a neutral position to a displaced position, and wherein a resisting force acts on the magnetic assembly when the magnetic assembly is in the displaced position.
8. The method of claim 1 , wherein the first current and the second current interact with the magnetic field generated by the magnetic assembly to excite the rectangular membrane, causing the magnetic assembly to move from a neutral position to a displaced position, and wherein the magnetic assembly is guided linearly by a guide post disposed within the housing.
9. The method of claim 1 , further comprising alternating the first current in the first electromagnetic coil and the second current in the second electromagnetic to change a speed at which the magnetic assembly moves.
10. The method of claim 1 , further comprising alternating the first current in the first electromagnetic coil and the second current in the second electromagnetic to change a distance which the magnetic assembly moves.
11. A non-transitory computer-readable memory medium configured to store instructions thereon that, when executed by a processor, cause the processor to:
cause a first electromagnetic coil and a second electromagnetic coil disposed within a pump housing to activate simultaneously induce a first current in the first electromagnetic coil and a second current in the second electromagnetic coil, the first electromagnetic coil and the second electromagnetic coil oriented with respect to a magnetic assembly disposed in the pump housing such that the magnet assembly is disposed between the first electromagnetic coil and the second electromagnetic coil;
wherein, the first current and the second current interact with a magnetic field generated by the magnetic assembly to excite a rectangular membrane coupled to the magnetic assembly thereby inducing a wave-like deformation in the rectangular membrane to pump blood from an inlet of the pump housing, along the rectangular membrane, and out an outlet of the pump housing.
12. The non-transitory computer-readable memory medium of claim 11 , wherein the first current and the second current are oriented in a direction to cause an attraction between the magnetic assembly and at least the first electromagnetic coil.
13. The non-transitory computer-readable memory medium of claim 11 , wherein the first current and the second current cause the magnetic assembly coupled to the rectangular membrane to move from a first position to a second position to induce the wave-like deformation in the rectangular membrane.
14. The non-transitory computer-readable memory medium of claim 13 , wherein the instructions, when executed, after causing the first electromagnetic coil and the second electromagnetic coil to simultaneously activate to induce the first current in the first electromagnetic coil and the second current in the second electromagnetic coil, cause the first electromagnetic coil and the second electromagnetic coil to simultaneously activate to induce a third current in the first electromagnetic coil and a fourth current in the second electromagnetic coil, the third current opposite the first current and the fourth current opposite the second current.
15. The non-transitory computer-readable memory medium of claim 14 , wherein the third current and the fourth current cause the magnetic assembly coupled to the rectangular membrane to move from the second position back to the first position.
16. The non-transitory computer-readable memory medium of claim 11 , wherein the instructions, when executed, further cause the first electromagnetic coil and the second electromagnetic coil to cease activation to cause the magnetic assembly to return to a neutral position.
17. The non-transitory computer-readable memory medium of claim 11 , wherein, the first current and the second current interact with the magnetic field generated by the magnetic assembly to excite the rectangular membrane by causing the magnetic assembly to move from a neutral position to a displaced position, and wherein a resisting force acts on the magnetic assembly when the magnetic assembly is in the displaced position.
18. The non-transitory computer-readable memory medium of claim 11 , wherein the first current and the second current interact with the magnetic field generated by the magnetic assembly to excite the rectangular membrane, causing the magnetic assembly to move from a neutral position to a displaced position, and wherein the magnetic assembly is guided linearly by a guide post disposed within the housing.
19. The non-transitory computer-readable memory medium of claim 11 , wherein the instructions, when executed, further cause the first current in the first electromagnetic coil and the second current in the second electromagnetic to alternate to change a speed at which magnetic assembly moves.
20. The non-transitory computer-readable memory medium of claim 11 , wherein the instructions, when executed, further cause the first current in the first electromagnetic coil and the second current in the second electromagnetic to alternate to change a distance which magnetic assembly moves.