Cardiac support systems and methods for chronic use
A high efficiency cardiac support system is suitable for chronic use in treating heart failure, wherein the system includes an implantable rotary blood pump, an implantable power module, a wireless power transfer subsystem, a patient monitor, and a programmer. In a cardiac support system, the cumulative efficiencies of the components of the system are capable of providing therapeutically effective blood flow for a typical day of awake hours using the energy from a single wireless recharge of an implanted rechargeable energy source. Moreover, the implantable rechargeable energy source may be recharged during a normal sleep period of 8 hours or less. The system may provide full or partial cardiac support without the need for external wearable batteries, controllers, or cables.
1. A method for treating heart failure, the method comprising:
generating an amount of blood flow with a rotary blood pump implanted in a patient;
coupling a transmitting coil assembly to a receiving coil assembly, implanted in the patient and contained within an implantable housing, using magnetic resonance coupling, such that the transmitting coil assembly electromagnetically transfers energy to the receiving coil assembly; and
storing, in a power module implanted in the patient and contained within the implantable housing, the energy transferred to the receiving coil assembly, the energy being utilized to operate the rotary blood pump.
2. The method of claim 1 , wherein the receiving coil assembly comprises a receiving resonant coil having a quality factor above 300.
3. The method of claim 1 , wherein the transmitting coil assembly comprises a transmitting resonant coil having a quality factor above 600.
4. The method of claim 1 , wherein the amount of blood flow is generated with an ECR of 1.0 or greater using the energy stored in the power module.
5. The method of claim 1 , wherein the amount of blood flow is generated with an ECR of 2.5 or greater using the energy stored in the power module.
6. The method of claim 1 , wherein the amount of blood flow is generated with an ECR of 4.0 or greater using the energy stored in the power module.
7. The method of claim 1 , wherein the receiving coil assembly is 100 cc or less in volume.
8. The method of claim 1 , wherein the power module is 150 cc or less in volume.
9. The method of claim 1 , further comprising detecting cardiac activity, wherein the amount of blood flow is adjusted in accordance with the cardiac activity detected.
10. The method of claim 1 , further comprising detecting physiological demand, wherein the amount of blood flow is adjusted in accordance with the physiological demand detected.
11. The method of claim 1 , further comprising monitoring the rotary blood pump wirelessly, wherein status information is provided visually, acoustically, or tactilely.
12. The method of claim 1 , wherein the amount of blood flow generated is pulsatile.
13. The method of claim 1 , further comprising programming the rotary blood pump wirelessly, wherein programming data is provided via RF or low frequency electromagnetic coupling.
14. The method of claim 13 , wherein the programming data alters an operational setting of the rotary blood pump, power module, or receiving coil assembly.