Portable drive system for artificial heart

• US 6,123,726 A
• Filed: 03/24/1999
• Issued: 09/26/2000
• Est. Priority Date: 07/25/1997
• Status: Expired due to Term

• Current Assignee: Sun Medical Technology Research Corporation (Misuzu & Sun Medical Holdings Co., Ltd.), Seiko Epson Corporation (Seiko Group)
• Original Assignee: Sun Medical Technology Research Corporation (Misuzu & Sun Medical Holdings Co., Ltd.), Seiko Epson Corporation (Seiko Group)
• Inventors: Kaneko, Keiichi, Yamazaki, Kenji, Higuchi, Koji, Mori, Toshio
• Primary Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US09/147,996
• Time in Patent Office: 552 Days
• Field of Search: 623/3.1, 623/3.13, 623/3.27, 623/3.15, 600/16, 600/17
• US Class Current: 623/3.27
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/196 replacing the entire heart, e.g. total artificial hearts [TAH]
• CPC Class Codes: A61M 60/232 Centrifugal pumps
• CPC Class Codes: A61M 60/237 the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
• CPC Class Codes: A61M 60/408 the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable
• CPC Class Codes: A61M 60/422 the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
• CPC Class Codes: A61M 60/515 Regulation using real-time patient data
• CPC Class Codes: A61M 60/538 Regulation using real-time blood pump operational parameter data, e.g. motor current
• CPC Class Codes: A61M 60/829 having a purge fluid supply

Abstract

A portable drive system for an artificial heart can be provided that includes a blood pump 1 having a blood seal for sealing a rotation shaft 13, a system drive section 45 including a purge solution circulator 20 for supplying by circulating purge solution to the blood seal 18, a pump controller 30 for driving the blood pump 1, a power supply means 33 for supplying electric power thereto, a display 40 for displaying operating states thereof, a communication interface 50 for transmitting information to the outside, and a controller means 100 for controlling these components, a portable transport section 60 for bearing the system drive section 45, and a connecting section 70 for connecting the blood pump 1 and the system drive section 45. The portable artificial-heart drive system has high safety and high reliability, is small-sized, lightweight and easy to use, and can expand the range of life.

Claims

1. A portable artificial-heart drive system, comprising:

a blood pump to cause blood to flow, said blood pump comprising;

a motor portion having a drive shaft to drive an artificial heart of a patient,

a bearing,

a rotation shaft extending from said motor portion and supported by said bearing,

a pump vane driven via said rotation shaft,

a blood seal for preventing a blood ingredient from entering said bearing, and

a casing connected to said motor portion and covering said pump vane;

a system drive section comprising;

a purge solution circulator to supply purge fluid solution by circulating to a contact portion of said blood seal to maintain shaft sealing of said rotation shaft with respect to blood of the patient,

a motor cable,

a pump controller to electrically control said motor portion in said blood pump via said motor cable,

a power supply to supply electric power to said pump controller and said purge solution circulator,

a display to display operating states of at least one of said pump controller, said power supply and said purge solution circulator and data thereon,

a communication interface to exchange information with an external device, and

a controller to control said display, said communication interface, said pump controller, said power supply and said purge solution circulator;

a movable transport section accommodating said system drive section; and

a connection unit comprising;

a connecting section to connect said blood pump and said system drive section, and

a skin button section to secure said connecting section on the epidermis of the patient.

2. A portable artificial-heart;

drive system according to claim 1, wherein said blood seal comprises one of a mechanical seal and an oil seal.

3. A portable artificial-heart drive system according to claim 1, wherein each of said purge solution circulator, pump controller, display, controller and communication interface has a respective priority, wherein said power supply supplies electric power only to at least one of said purge solution circulator, pump controller, display, controller and communication interface if the respective priority is high and if a quantity of electric power remaining in said power supply falls below a specified value.

4. A portable artificial-heart drive system according to claim 3, wherein pump controller has the high priority.

5. A portable artificial-heart drive system according to claim 1, wherein said system drive section comprises at least two pump controllers and respective power supplies.

6. A portable artificial-heart drive system according to claim 1, further comprising:

a second pump controller and a second power supply,

wherein said second pump controller and second power supply are disposed outside of said transport section.

7. A portable artificial-heart drive system according to claim 1, wherein said purge solution circulator comprises:

a reservoir to store the purge solution;

a purge solution circulating pump,

a filter, and

a purge solution circulation route for connecting said reservoir, said purge solution circulation pump and said filter among one another,

wherein said purge solution circulating pump circulates the purge solution between said reservoir and said blood seal,

wherein said filter filters the purge solution,

wherein said purge solution circulator circulates the purge solution inside said blood pump via said filter.

8. A portable artificial-heart drive system according to claim 7, wherein said purge solution comprises:

a solution selected from the group consisting of pure water and physiological saline, and

a disinfectant for sterilizing the purge solution.

9. A portable artificial-heart drive system according to claim 7, wherein said purge solution circulator further comprises a bypass channel wherein said reservoir has an inlet and an outlet, wherein said outlet is in communication with said purge solution circulating pump, wherein said purge solution circulating pump is in communication with said filter, wherein said inlet is in communication with said bypass channel and wherein said bypass channel is in communication with said filter.

10. A portable artificial-heart drive system according to claim 7, wherein said purge solution circulating pump, said filter, and said reservoir are combined into a unit.

11. A portable artificial-heart drive system according to claim 7, wherein said reservoir comprises a flexible material.

12. A portable artificial-heart drive system according to claim 7, wherein said purge solution circulator further comprises at least one pressure sensor disposed at one of an inlet and outlet of said filter.

13. A portable artificial-heart drive system according to claim 7, wherein said purge solution circulator further comprises at least one temperature sensor.

14. A portable artificial-heart drive system according to claim 1, wherein said controller comprises a kinetic load detecting mechanism to detect the kinetic load of the patient using said portable drive system, and wherein said controller controls the operating condition of said blood pump according to the output from said kinetic load detecting mechanism.

15. A portable artificial-heart drive system according to claim 14, wherein said kinetic load detecting mechanism detects a moving speed of said transport section.

16. A portable artificial-heart drive system according to claim 14, wherein said kinetic load detecting mechanism detects a load change of said motor portion in said blood pump, the load change synchronizing with the heart rate of the living body.

17. A portable artificial-heart drive system according to claim 14, wherein said kinetic load detecting mechanism comprises:

a speed detector to detect a speed of said transport section, and

a heart rate detector to detect the heart rate of the patient.

18. A portable artificial-heart drive system according to claim 16, wherein said kinetic load detecting mechanism detects a change in current value of said motor portion in said blood pump, and detects the kinetic load of the patient based on an estimated heart rate.

19. A portable artificial-heart drive system according to claim 16, wherein said kinetic load detecting mechanism detects a change in number of revolutions of said motor portion in said blood pump, and detects the kinetic load of the patient based on an estimated heart rate.

20. A portable artificial-heart drive system according to claim 1, wherein said display displays operating states of said said portable artificial-heart drive system, and provides an alarm when deviation from a set value arises.

21. A portable artificial-heart drive system according to claim 1, wherein said communication interface exchanges information between the patient and one of a hospital and a doctor.

22. A portable artificial-heart;

drive system according to claim 1, further comprising;

a connecting terminal arranged on a belt-like stomach band worn by the patient; and

a motor cable connecting said blood pump, said connecting terminal and said pump controller,

wherein said connecting section comprises first and second purge tubes for connecting said blood pump and said purge solution circulator, said motor cable.

23. A portable artificial-heart drive system according to claim 22, wherein said connecting section further comprises a bellow-like protective tube, wherein said first and second purge tubes and said motor cable are helically shaped, and said bellows-like protective tube covers said first and second purge tubes and said motor cable, so that said connecting section is expandable.

24. A portable artificial-heart;

drive system according to claim 23, wherein an expansion amount of said protective tube is smaller than that of said first and second purge tubes and said motor cable in said connecting section.

25. A portable artificial-heart drive system according to claim 23, wherein said protective tube comprises a plurality of circular rings embedded therein.

26. A portable artificial-heart drive system according to claim 22, wherein said first and second purge tubes comprise a valve mechanism for blocking the flow of the purge solution.

27. A portable artificial-heart drive system according to claim 26, wherein said valve mechanism is disposed between said connecting terminal and said blood pump.

28. A portable artificial-heart drive system according to claim 22, wherein said connecting terminal comprises at least one system of pump controller and a power supply.

29. A portable artificial-heart drive system according to claim 1, wherein said skin button section comprises a carbon fiber structure having many air spaces on the surface thereof, and is implanted inside the epidermis F of the patient.

30. A portable artificial-heart drive system according to claim 1, wherein said transport section comprises a mount having a wheel for portably bearing said system drive section located outside the body, and is automatically and manually carried along with the patient.

31. A portable artificial-heart drive system according to claim 30, wherein said transport section comprises a waterproof and anti-contamination structure for preventing contaminants from entering said system drive section.

32. A portable artificial-heart drive system according to claim 30, wherein said transport section comprises a shock-absorbing structure so that vibrations and shocks caused by movement are not transmitted to said system drive section.

33. A portable artificial-heart drive system according to claim 1, wherein said power supply comprises a plurality of power sources, wherein said plurality of power sources comprises at least one of a commercial AC power source, an automobile-installed power source, and a secondary battery built in said transport section, wherein said power supply comprises a switch to select at least one of said plurality of sources.