Portable electro-therapy system

• US 4,998,532 A
• Filed: 02/21/1989
• Issued: 03/12/1991
• Est. Priority Date: 05/23/1986
• Status: Expired due to Term

• Current Assignee: the united states of america as represented by the secretary of the navy, Trustees Of The University Of Pennsylvania (University of Pennsylvania)
• Original Assignee: LTI Biomedical, Inc. A CORPORATION OF CALIFORNIA
• Inventors: Griffith, Neil
• Primary Examiner(s): Jaworski, Francis
• Assistant Examiner(s): MANUEL, GEORGE C
• Application Number:
  US07/313,332
• Time in Patent Office: 749 Days
• Field of Search: 128/422, 128/423, 128/419 F, 600/9, 600/10, 600/11, 600/12, 600/13
• US Class Current: 607/2
• CPC Class Codes: A61N 1/40 Applying electric fields by inductive or capacitive coupling microwave apparatus A61N5/00; Applying radio-frequency signals
• CPC Class Codes: A61N 2/02 using magnetic fields produced by coils, including single turn loops or electromagnets A61N2/12 takes precedence

Abstract

A portable non-invasive apparatus for electro-therapeutic stimulation of tissue and bone healing readily worn or carried by a patient, capable of generating an energy-efficient signal coacting with a suitable transducer of the signal, thereby realizing portability and stimulating tissue and bone healing.

Claims

1. A portable apparatus for electro-therapy of bone fractures comprising:

a source of electric power connected to a means for converting said electric power into a series of substantially amplitude-symmetric voltage cycles, said voltage cycles comprising a train of bursted pulses having a pulse width of 0.5.20 microseconds, and a transducer means connected to said source of electric power for receiving said symmetric voltage cycles positioned so that an electromagnetic field at a fracture site is generated by applying said electric power to said transducer.

2. An apparatus as described in claim 1 wherein said source of electric power is a battery having a voltage of about 10-40 volts and a volume of about 2-6 cubic inches.

3. An apparatus as described in claim 2 wherein said voltage cycle comprises a symmetric electric signal having a frequency of about 5-25 Hz, and a burst width of about 1-10 milliseconds.

4. An apparatus as described in claim 3 further comprising a voltage cycle having a peak to peak amplitude of greater than 25 mV and less than 200 millivolts

5. An apparatus as described in claim 3 wherein said electric signal is sinusoidal.

6. An apparatus as described in claim 3 wherein said electric signal is a rectangular wave.

7. An apparatus as described in claim 3 wherein said wave form is triangular.

8. An apparatus as described in claim 1 wherein said source of electric power weighs less than 2 pounds.

9. An apparatus as described in claim 1 wherein said transducer means is a coil transducer selected from the group consisting of a conformal solenoid, oblique coil, and simple coil.

10. An apparatus as described in claim 1 wherein said transducer means is a conformal solenoid.

11. An apparatus as described in claim 1 wherein said transducer means is a conformal magnetic dipole.

12. An apparatus as described in claim 1 wherein said transducer means is formed in a cast so that said transducer means is closely proximal to said fracture site.

13. A portable apparatus for stimulating tissue healing comprising a battery supplying power connected to a means for converting said power to a series of substantially amplitude-symmetric voltage cycles, said voltage cycles comprising a train of bursted pulses having a pulse width of approximately 2-10 microseconds, and a peak-to-peak amplitude of approximately 50-150 millivolts, and a transducer means connected to received said voltage cycles for transducing said voltage cycles into an electromagnetic field at a treatment site to stimulate tissue healing at said treatment site.

14. An apparatus as described in claim 13 wherein said source of battery power is 10-40 volts and has a volume of about 2-6 cubic centimeters.

15. A portable apparatus for stimulating tissue healing comprising a battery supplying power connected to a means for converting said power to a series of substantially amplitude-symmetric voltage cycles, said voltage cycles comprising a train of bursted pulses having a pulse width of approximately 2-10 microseconds, and a transducer means connected to receive said voltage cycles for transducing said voltage cycles into an electromagnetic field at a treatment site to stimulate tissue healing at said treatment site.

16. An apparatus as described in claim 15 wherein said source of electric power is a battery having a voltage of about 10-40 volts and a volume of about 2-6 cubic centimeters.

17. An apparatus as described in claim 15 wherein said transducer means is a coil transducer selected from the group consisting of a conformal solenoid, oblique coil, and simple coil.

18. An apparatus as described in claim 15 wherein said transducer means is a conformal solenoid.

19. An apparatus as described in claim 15 wherein said transducer means is a conformal magnetic dipole.

20. An apparatus as described in claim 15 wherein said transducer means is formed in said cast so that said transducer means is closely proximal to said treatment site.

21. A portable apparatus for stimulating tissue healing comprising battery power connected to a means for converting said battery power to a series of substantially amplitude symmetric voltage cycles, said voltage cycles comprising a train of bursted pulses, and a transducer means connected to receive said voltage cycles for transducing said voltage cycles into an electromagnetic field at a treatment site to stimulate tissue healing at said treatment site.