Cooling systems and methods for conductive coils

• US 9,610,459 B2
• Filed: 07/24/2009
• Issued: 04/04/2017
• Est. Priority Date: 07/24/2009
• Status: Expired due to Fees

• Current Assignee: Emkinetics, Inc.
• Original Assignee: Emkinetics, Inc.
• Inventors: Burnett, Daniel Rogers, Hermanson, Christopher, Ahlman, James H., Strul, Bruno
• Primary Examiner(s): MATTHEWS, CHRISTINE HOPKINS
• Application Number:
  US12/509,362
• Publication Number:
  US 20110021863A1
• Time in Patent Office: 2,811 Days
• Field of Search: 600 9- 15
• CPC Class Codes: A61N 2/006 for magnetic stimulation of nerve tissue
• CPC Class Codes: A61N 2/008 for pain treatment or analgesia
• CPC Class Codes: A61N 2/02 using magnetic fields produced by coils, including single turn loops or electromagnets A61N2/12 takes precedence

Abstract

An energy emitting apparatus for providing a medical therapy includes one or more energy generators, a logic controller connected to the one or more energy generators, and optionally one or more sensors that are connected to the logic controller for detecting muscle stimulation or electric conduction in a target nerve. The energy generators produce energy focused on the target nerve upon receiving a signal from the logic controller, and the energy can be varied by the logic controller according to an input provided by the one or more sensors. In certain embodiments, the energy emitting apparatus includes one or more conductive coils that produce a magnetic field focused on the target nerve upon receiving an electric current. In certain embodiments, a variety of cooling mechanisms or systems may be implemented for cooling the coil.

Claims

1. An energy emitting system for providing a medical therapy comprising:

a conductive coil, wherein the conductive coil is configured to generate a magnetic field focused on a target nerve, the conductive coil comprising a coil body, and the conductive coil having a central aperture, and a non-electrically conductive material positioned partially on a surface of the coil body such that remaining portions of the coil body are exposed, wherein the non-electrically conductive material is configured to maintain fluid flow gaps between adjacent turns of the coil body;

a cooling device; and

a housing having a patient interface plate wherein the conductive coil is positioned within the housing such that a gap is provided between the conductive coil and patient interface plate, the conductive coil being positioned between the patient interface plate and the cooling device;

wherein the cooling device is positioned within the housing and in proximity to the conductive coil such that the cooling device is positioned adjacent to the conductive coil transverse to a plane defined by the conductive coil, whereby air is forced into a transverse direction relative to the plane of the conductive coil and through the fluid flow gaps between adjacent turns and through the central aperture such that airflow passes through the turns to cool the conductive coil.

2. The system of claim 1, wherein the non-electrically conductive material is selected from the group consisting of epoxy, plastic, non-electrically conductive polymers, and silicone.

3. The system of claim 1, wherein the non-electrically conductive material comprises a tape wrapped around the coil body at a non-zero angle, the tape configured to maintain fluid flow gaps between adjacent turns of the coil body for cooling the conductive coil.

4. The system of claim 3, wherein the tape comprises silicone.

5. The system of claim 1, wherein the gap between the conductive coil and patient interface plate has a width ranging from about 1 mm to 2 mm.

6. The system of claim 1, wherein a distance between the non-electrically conductive material and the patient interface plate is from about 0.2 mm to 0.5 mm.

7. The system of claim 1 wherein the patient interface plate comprises a reflective surface.

8. The system of claim 1, wherein the cooling device comprises a fan which provides an airflow rate of from about 1 liter per second to 2 liters per second.

9. The system of claim 1, wherein the conductive coil is substantially planar, and wherein the conductive coil has a spiral configuration and a substantially flat surface.

10. The system of claim 1, wherein the conductive coil is substantially conical.

11. The system of claim 1, wherein a diameter of the conductive coil is from about 4.5 inches to about 5 inches in length.

12. The system of claim 1, wherein the conductive coil comprises 14 to 20 turns, and each turn is separated by a gap.

13. The system of claim 1, wherein the coil body further comprises a first turn wherein a cross section of the first turn is configured such that its height is greater than its width.

14. The system of claim 13, wherein the height is from about 0.5 inch to about 2 inch and the width is from about 0.01 inch to about 0.06 inch.

15. The system of claim 13, wherein the first turn comprises a first surface, and at least a portion of the first surface is coated with a phase changing material which allows for conduction cooling.

16. The system of claim 15, wherein the phase changing material comprises a wax.

17. The system of claim 15, further comprising a cooling device, wherein the cooling device is configured to cool and thereby solidify the phase changing material.

18. The system of claim 1, wherein the conductive coil has a substantially flat surface.

19. An energy emitting system for providing a medical therapy to a patient comprising:

a conductive coil positioned within a housing, wherein the conductive coil is configured to generate a magnetic field focused on a target nerve, and wherein the conductive coil comprises a coil body having a plurality of turns and wherein the conductive coil has a central aperture such that the conductive coil forms a spiral configuration which is planar with the plurality of turns and the central aperture located within a single plane and where a radius for each successive turn increases from a center of the spiral coil; and

a cooling device, wherein the cooling device is positioned relative to the housing and the conductive coil such that the cooling device draws air into the housing, over the coil body, between first and second turns of the plurality of turns such that airflow surrounds the turns, and through the central aperture.

20. The energy emitting system of claim 19, further comprising a non-electrically conductive material positioned on a surface of the coil body, the material configured to maintain air flow gaps between adjacent turns of the coil body and provide an air flow channel for cooling the conductive coil.

21. The energy emitting system of claim 19, wherein the housing comprises a patient interface plate and a venting plate positioned substantially opposite the patient interface plate.

22. The energy emitting system of claim 21, further comprising a sensor positioned in proximity to the venting plate, wherein the sensor monitors temperature of warmed air vented from the venting plate.

23. The energy emitting system of claim 21, further comprising a sensor positioned in proximity to the patient interface plate, wherein the sensor monitors temperature of the patient interface plate.

24. The energy emitting system of claim 19, wherein the system is configured to provide from about 36,000 to 45,000 pulses over about 20 to 40 minutes, while a patient interface plate remains at a temperature of no greater than 42 degrees C.

25. The system of claim 19, further comprising a sensor configured to detect muscle stimulation or electrical conduction in the target nerve;

and a controller coupled to the coil and in communication with the sensor.

26. The system of claim 19 wherein a first turn of the plurality of turns comprises a first surface having at least one raised protrusion separating the first turn from a second turn of the plurality of turns which forms a gap that allows for convection cooling.

27. The system of claim 26, wherein the at least one raised protrusion comprises a non-conductive material selected from the group consisting of ceramic or ceramic alloy.

28. The system of claim 26, wherein the second turn has a radius of curvature greater than a radius of curvature of the first turn.

29. The system of claim 19, wherein the conductive coil has a substantially flat surface.

30. An energy emitting system for providing a medical therapy comprising:

a conductive coil configured to generate a magnetic field focused on a target nerve, the conductive coil comprising;

a first end and a second end; and

a coil body having a plurality of turns which are positioned between the first end and second end, the conductive coil having a lumen,

wherein the conductive coil forms a spiral configuration which is planar with the plurality of turns and a central aperture located within a single plane and where a radius for each successive turn increases from a center of the spiral coil,

wherein the lumen extends in parallel with a length of the coil from the first end to the second end providing a passage extending through an interior of the conductive coil such that the passage follows the plurality of turns formed by the coil body and an opening at the first end is in fluid communication with an opening at the second end, and

wherein the lumen is configured to permit the passage of fluid within the lumen between the first end and the second end for cooling the conductive coil.

31. A method of magnetic induction therapy comprising:

positioning a first portion of a patients body relative to an energy emitting device such that a target nerve within the first portion of the body is in proximity to a conductive coil having a plurality of turns and a central aperture, where the conductive coil is disposed within or along the energy emitting device, wherein the conductive coil forms a spiral configuration which is planar with the plurality of turns and the central aperture located within a single plane and where a radius for each successive turn increases from a center of the spiral coil;

passing a current through the conductive coil to generate a magnetic field focused on the target nerve;

concentrating a magnetic flux near the target nerve; and

drawing in air at a flow rate over the conductive coil and in between first and second turns of the plurality of turns of the conductive coil such that the air surrounds the first and second turns, and passes through the central aperture of the conductive coil to cool the conductive coil.

32. The method of magnetic induction therapy according to claim 31, wherein the flow rate comprises a range of flow rates selected from the group consisting of 1 liter per second to about 5 liters per second or 2 liters per second to about 4 liters per second.

33. The method of magnetic induction therapy according to claim 31, wherein the flow rate comprises a range of flow rates selected from the group consisting of 20 CFM to about 100 CFM or from about 25 CFM to about 60 CFM.

34. The method of magnetic induction therapy according to claim 31, wherein the flow produces a range of pressure head selected from the group consisting of from about 0.5 inches of H20 to about 10 inches of H20 or from about 0.5 inches of H20 to about 4 inches of H20.

35. The method of magnetic induction therapy according to claim 31, further comprising venting warmed air away from the first portion of the patient'"'"'s body.

36. The method of magnetic induction therapy according to claim 35, wherein the warmed air is vented in a direction substantially opposite the first portion of the patient'"'"'s body.

37. The method of magnetic induction therapy according to claim 35, further comprising detecting a temperature of the warmed air.

38. The method of magnetic induction therapy according to claim 37, wherein the energy emitting device provides from about 36,000 to 45,000 pulses over about 20 to 40 minutes, while maintaining a patient interface plate of the device at a temperature of no greater than 42 degrees C.

39. The method of magnetic induction therapy according to claim 31, wherein the target nerve is the tibial nerve.

40. The method of magnetic induction therapy according to claim 31, further comprising treating a patient exhibiting symptoms associated with urinary incontinence, fecal incontinence, restless leg syndrome or premature ejaculation.