Electro-medical device for use with biologics

• US 6,560,487 B1
• Filed: 10/06/2000
• Issued: 05/06/2003
• Est. Priority Date: 05/08/2000
• Status: Expired due to Term

• Current Assignee: International Rehabilitative Sciences, Inc. (RS Medical Corp.)
• Original Assignee: International Rehabilitative Sciences, Inc. (RS Medical Corp.)
• Inventors: Carroll, William J., Terrell, Richard M., Rux, William A., Murphy, Randy Alan, McGraw, Michael B.
• Primary Examiner(s): Getzow, Scott M.
• Application Number:
  US09/679,557
• Time in Patent Office: 942 Days
• Field of Search: 607/3, 607/50, 607/51, 607/67
• US Class Current: 607/51
• CPC Class Codes: A61N 1/323 Interference currents, i.e. treatment by several currents summed in the body
• CPC Class Codes: A61N 1/326 for promoting growth of cells, e.g. bone cells

Abstract

A multi-functional portable electro-medical device provides interferential current stimulation to promote bone growth. Two electrical signals are applied to a target area, each electrical signal being formed by a set of two electrode pads. A beat frequency is created at the location the signals intersect with each other. The beat frequency is the difference between the frequencies of the two signals and has an amplitude that is additive and greater than either signal alone. The depth of the interferential signal is increased by increasing the carrier frequency of the signals. The direction of the interferential signal shifts toward the signal having the lower amplitude. The electrical stimulation is used in combination with biologics to further increase bone growth.

Claims

1. An electro-medical device for increasing bone growth comprising a first set of electrode pads for applying a first electrical signal having a first frequency and amplitude to a target area, a second set of electrode pads for applying a second electrical signal having a second frequency and amplitude to the target area, said first and second electrical signals forming an interferential signal having a beat frequency, and further comprising a biologic applied at the body segment to increase bone growth.

2. The device of claim 1, wherein the beat frequency is equal to a difference between the first and second frequencies.

3. The device of claim 1, wherein the amplitude of the interferential signal is the additive of the first and second amplitudes.

4. The device of claim 1, wherein the biologic comprises hyaluronic acid.

5. The device of claim 1, wherein the biologic comprises a bone morphogenic protein.

6. The device of claim 1, wherein direction of the interferential signal is controlled by controlling one of the first and second amplitudes.

7. The device of claim 6, wherein the interferential signal shifts toward the one of the first and second electrical signals as the respective one of the first and second amplitudes is decreased.

8. The device of claim 1, wherein the depth the interferential signal penetrates the target area is increased by increasing one of the first and second frequencies.

9. The device of claim 1, wherein the first and second frequencies are 1,000-20,000 Hz.

10. The device of claim 1, wherein the beat frequency is 0-250 Hz.

11. The device of claim 1, wherein the beat frequency is at the intersection of the first frequency and the second frequency.

12. The device of claim 1, wherein the target area is at a body segment and wherein the first and second electrical signals comprise a capacitively-coupled field that imparts a current to the body segment.

15. The device of claim 12, wherein the signal applicator applies the electrical signal directly to the skin of a patient.

16. The device of claim 12, wherein the biologic comprises hyaluronic acid.

17. The device of claim 12, wherein the biologic comprises a bone morphogenic protein.

18. The device of claim 12, wherein the interferential electrical signal has a beat frequency from 0-250 Hz.

20. The device of claim 12, wherein the capacitively-coupled stimulation imparts a current to the body segment.

13. An electro-medical device for increasing bone growth of a body segment, comprising a signal applicator for applying an interferential electrical signal which imparts a capacitively-coupled stimulation to the body segment, and a biologic applied to the body segment to increase bone growth.

14. The device of claim 13, wherein the signal applicator comprises a set of surface electrode pads.

19. The device of claim 13, wherein the capacitively-coupled stimulation has a frequency of 20,000 Hz or less.

22. The method of claim 19, wherein the biologic comprises a hylarnic acid.

23. The method of claim 19, wherein the biologic comprises a bone morphogenic protein.

25. The method of claim 19, wherein the capacitively-coupled stimulation imparts a current to the body segment.

21. A method of promoting bone growth stimulation comprising applying an electrical signal which imparts a capacitively-coupled stimulation to a body segment with surface electrode pads and applying a biologic to the body segment, wherein the electrical signal is applied by crossing two electrical signals at the body segment.

24. The method of claim 21, wherein the capacitively-coupled stimulation has a frequency of 20,000 Hz or less.

26. A method of promoting bone growth stimulation comprising applying an interferential electrical signal which imparts a capacitively-coupled stimulation to a body segment with surface electrode pads and applying a biologic to the body segment.

27. An electro-medical device for increasing bone growth of a body segment comprising a first set of surface electrode pads in contact with the body segment for applying a first electrical signal having a first frequency to the body segment, a second set of surface electrode pads in contact with the body segment for applying a second electrical signal having a second frequency to the body segment, said first and second electrical signals forming a capacitively-coupled field having an interferential signal with a beat frequency, and further comprising a biologic applied at the body segment to increase bone growth.

28. The device of claim 27, wherein the capacitively-coupled field imparts a current to the body segment.