Personal warming systems and apparatuses for use in hospitals and other settings, and associated methods of manufacture and use

• US 6,967,309 B2
• Filed: 09/08/2003
• Issued: 11/22/2005
• Est. Priority Date: 06/14/2000
• Status: Expired due to Term

• Current Assignee: Medline Industries Incorporated (Medline Holdings Incorporated)
• Original Assignee: American Healthcare Products Incorporated
• Inventors: Ellis, Kent D., Wyatt, Charles C., Siegner, Kenneth S., Wilkerson, Jack
• Primary Examiner(s): Jeffery, John A.
• Application Number:
  US10/657,727
• Publication Number:
  US 20040149711A1
• Time in Patent Office: 806 Days
• Field of Search: 219528-529, 219/217, 219/218, 219/549, 219/521, 219/543, 219/545, 542/1, 569/0, 560/0, 560/3, 607/96, 607/98, 607/112, 338/208
• US Class Current: 219/217
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2017/00199 with a console, e.g. a control panel with a display
• CPC Class Codes: A61F 2007/0001 Body part
• CPC Class Codes: A61F 2007/0071 using a resistor, e.g. near the spot to be heated
• CPC Class Codes: A61F 2007/0072 remote from the spot to be heated
• CPC Class Codes: A61F 2007/0288 during operations
• CPC Class Codes: A61F 7/00 Heating or cooling appliances for medical or therapeutic treatment of the human body heating or cooling means in connection with bedsteads or mattresses A47C21/00 ; massage, therapeutic baths A61H; hyperthermia using electric or magnetic fields or ultrasound A61N; electric heating elements H05B
• CPC Class Codes: A61F 7/007 characterised by electric heating
• CPC Class Codes: H05B 2203/005 using multiple resistive elements or resistive zones isolated from each other
• CPC Class Codes: H05B 2203/011 Heaters using laterally extending conductive material as connecting means
• CPC Class Codes: H05B 2203/013 Heaters using resistive films or coatings
• CPC Class Codes: H05B 2203/017 Manufacturing methods or apparatus for heaters
• CPC Class Codes: H05B 3/36 heating conductor embedded in insulating material

Abstract

Personal warming systems and apparatuses for use in hospitals and other settings are disclosed herein. In one embodiment, a heating pad for warming a patient during a hospital procedure can include a heating element and a patient support portion. The heating element can include one or more radiolucent, or at least generally radiolucent, features. The radiolucent features can include conductive paths supported by a flexible substrate. The conductive paths can include conductive yarns oriented in linear and/or non-linear patterns on the flexible substrate. In one aspect of this embodiment, the conductive yarns can include conductive strands having a metallic plating, such as silver plating.

Claims

1. A patient warming device usable to warm a person, the patient warming device comprising:

a support portion configured to support at least part of the person;

a flexible substrate positioned at least proximate to the support portion;

a plurality of conductive strands supported by the flexible substrate, each of the conductive strands having a core portion and a conductive portion carried by the core portion, wherein the conductive strands are configured to generate heat to warm the person when the person is positioned at least partially on the support portion; and

an optical temperature sensing device positioned at least proximate to the conductive strands and configured to respond to changes in temperature of the warming device, wherein the optical temperature sensing device includes a thermal chromatic liquid crystal.

2. The patient warming device of claim 1 wherein the flexible substrate includes a nylon weave, and wherein the plurality of conductive strands are interwoven with the nylon weave.

3. The patient warming device of claim 1 wherein the flexible substrate includes a fabric material, wherein each of the active strands includes a non-conductive core and metallic plating, and wherein the plurality of conductive strands are interwoven with the fabric material.

4. The patient warming device of claim 1 wherein the flexible substrate includes a nylon weave, wherein each of the conductive strands includes a nylon core with a silver portion, and wherein the plurality of conductive strands are interwoven with the nylon weave.

5. The patient warming device of claim 1 wherein the conductive portion of each of the conductive strands includes metal.

6. The patient warming device of claim 1 wherein each of the conductive strands includes a nylon core with metallic plating.

7. The patient warming device of claim 1 wherein each of the conductive strands includes a nylon core with silver plating.

8. The patient warming device of claim 1 wherein the conductive portion of each of the conductive strands includes silver having a thickness of about 10 microns or less.

9. The patient warming device of claim 1 wherein the conductive portion of each of the conductive strands includes silver having a thickness of about 5 microns or less.

10. The patient warming device of claim 1 wherein the plurality of conductive strands forms a non-linear pattern on the flexible substrate.

11. The patient warming device of claim 1 wherein the plurality of conductive strands forms a repeating geometric pattern on the flexible substrate.

12. The patient warming device of claim 1, further comprising a plurality of non-conductive strands, wherein each of the non-conductive strands is entwined with at least one of the conductive strands to form a plurality of conductive yarns supported by the flexible substrate.

13. The patient warming device of claim 1 wherein the core portion of each of the conductive strands includes nylon yarn of about 100 denier or less.

14. The patient warming device of claim 1 wherein the core portion of each of the conductive strands includes nylon yarn of about 33 denier or less.

15. The patient warming device of claim 1, further comprising a plurality of polyester strands, wherein each of the polyester strands is entwined with at least one of the conductive strands to form a plurality of conductive yarns, wherein the plurality of conductive yams are interwoven with the flexible substrate.

16. The patient warming device of claim 1, further comprising a plurality of polyester strands of about 150 denier or less, wherein each of the polyester strands is entwined with at least one of the conductive strands to form a plurality of conductive yarns, wherein the plurality of conductive yarns are interwoven with the flexible substrate.

17. The patient warming device of claim 1, wherein the each of the conductive strands includes a nylon core of about 33 denier having silver plating with a thickness of about 5 microns or less, and further comprising a plurality of polyester strands of about 150 denier or less, wherein each of the polyester strands is entwined with at least one of the conductive strands to form a plurality of conductive yarns, wherein the plurality of conductive yarns are interwoven with the flexible substrate.

18. The patient warming device of claim 1 further comprising a plurality of non-conductive strands, wherein each of the non-conductive strands is entwined with at least two of the conductive strands to form a plurality of conductive yams supported by the flexible substrate.

19. The patient warming device of claim 1 wherein each of the conductive strands includes a nylon core with silver plating, and further comprising a plurality of non-conductive strands, wherein each of the non-conductive strands are entwined with at least two of the conductive strands to form a plurality of conductive yarns supported by the flexible substrate.

20. The patient warming device of claim 1 wherein the conductive strands are at least generally transparent to x-ray imaging.

21. The patient warming device of claim 1 wherein the conductive strands are at least generally transparent to x-ray imaging in an x-ray field having a strength of about 100 Roentgens or less.

22. The patient warming device of claim 1 wherein the flexible substrate includes a fabric material, and wherein the plurality conductive of strands are woven into the fabric material.

23. The patient warming device of claim 1 wherein the flexible substrate includes a fiber weave, wherein each of the conductive strands includes a nylon core with metallic plating, and wherein the plurality of conductive strands are interwoven with the fiber weave.

24. The patient warming device of claim 1 wherein the flexible substrate includes a fiber weave, wherein each of the conductive strands includes a silver portion, and wherein the plurality of conductive strands are interwoven with the fiber weave.

25. The patient warming device of claim 1 wherein the core portion of each of the conductive strands is at least generally non-conductive.

26. The patient warming device of claim 1 wherein the conductive portion of each of the conductive strands includes silver.

27. The patient warming device of claim 1 wherein the conductive portion of each of the conductive strands includes silver having a thickness of about 100 microns or less.

28. The patient warming device of claim 1, wherein each of the conductive strands includes a nylon core of about 33 denier or less having silver plating with a thickness of about 5 microns or less.

29. The patient warming device of claim 1, further comprising a plurality of non-conductive strands, wherein each of the non-conductive strands is entwined with at least one of the conductive strands to form a plurality of conductive yarns, and wherein the plurality of conductive yarns are interwoven with the flexible substrate.

30. The patient warming device of claim 1, further comprising:

a first conductive lead supported by the flexible substrate, the first conductive lead coupled to the plurality of conductive strands and configured to be biased at a first electrical potential; and

a second conductive lead supported by the flexible substrate and spaced apart from the first conductive lead, the second conductive lead coupled to the plurality of conductive strands and configured to be biased at a second electrical potential to cause electrical current to flow through each of the conductive strands and generate heat.

31. The patient warming device of claim 1 wherein the conductive strands are at least generally radiolucent.

32. The patient warming device of claim 1 wherein the optical temperature sensing device is at least generally transparent to x-rays.

33. The patient warming device of claim 1 wherein the support portion includes a compressible foam portion that at least generally overlays the flexible substrate.

34. The patient warming device of claim 1 wherein the support portion includes a first foam pad disposed adjacent to a first surface of the flexible substrate, and further comprising a second foam pad disposed adjacent to a second surface of the flexible substrate opposite the first surface of the flexible substrate.

35. The patient warming device of claim 1 wherein the support portion includes an upper foam pad disposed adjacent to an upper surface of the flexible substrate, the upper foam pad having a thickness of about 1.0 inch or less.

36. The patient warming device of claim 1 wherein the support portion includes an upper foam pad disposed adjacent to an upper surface of the flexible substrate, the upper foam pad having a thickness of about 0.5 inch or less.

37. A patient warming device usable to warm a person, the patient warming device comprising:

a support portion configured to support at least part of the person;

a flexible substrate positioned at least proximate to the support portion;

at least one conductive path defining a non-linear pattern extending across at least a portion of the flexible substrate, wherein the conductive path is configured to generate heat to warm the person when the person is positioned at least partially on the support portion; and

an optical temperature sensing device positioned at least proximate to the at least one conductive path and configured to respond to changes in temperature of the warming device, wherein the optical temperature sensing device includes a thermal chromatic liquid crystal.

38. The patient warming device of claim 37, further comprising:

a first conductive lead supported by the flexible substrate, the first conductive lead coupled to the at least one conductive path and configured to be biased at a first electrical potential; and

a second conductive lead supported by the flexible substrate and spaced apart from the first conductive lead, the second conductive lead coupled to the at least one conductive path and configured to be biased at a second electrical potential to cause electrical current to flow through the at least one conductive path and generate heat.

39. The patient warming device of claim 37 wherein the flexible substrate includes a fiber weave, and wherein the at least one conductive path is woven into the fiber weave.

40. The patient warming device of claim 39 wherein the fiber weave includes a cloth material.

41. The patient warming device of claim 37 wherein the flexible substrate includes a nylon weave, and wherein the at least one conductive path is interwoven with the nylon weave.

42. The patient warming device of claim 37 wherein the at least one conductive path includes a silver portion having a thickness of about 100 microns or less.

43. The patient warming device of claim 37 wherein the at least one conductive path forms a non-linear pattern on the flexible substrate.

44. The patient warming device of claim 37 wherein the at least one conductive path is at least generally radiolucent.

45. The patient warming device of claim 37 wherein the at least one conductive path is at least generally transparent to x-ray imaging in an x-ray field having a strength of about 100 Roentgens or less.

46. The patient warming device of claim 37 wherein the at least one conductive path includes a plurality of conductive paths, wherein each of the plurality of conductive paths defines a repeating geometric pattern extending across at least a portion the flexible substrate.

47. The patient warming device of claim 37 wherein the at least one conductive path is a first conductive path defining a non-linear pattern, and further comprising a plurality of at least generally linear conductive paths extending across at least a portion of the flexible substrate, wherein the plurality of at least generally linear conductive paths are configured to generate heat by conducting electricity, and wherein the plurality of at least generally linear conductive paths intersect the first conductive path on the flexible substrate to form a conductive intersection.

48. The patient warming device of claim 37 wherein the at least one conductive path includes at least a portion of a conductive strand supported by the flexible substrate, the conductive strand having:

a core portion; and

a conductive portion carried by the core portion.

49. The patient warming device of claim 37 wherein the at least one conductive path includes at least a portion of a conductive strand supported by the flexible substrate, the conductive strand having:

a non-conductive core portion; and

a metallic portion carried by the core portion.

50. The patient warming device of claim 37 wherein the at least one conductive path includes a plurality of conductive strands supported by the flexible substrate.

51. The patient warming device of claim 37 wherein the at least one conductive path defines a repeating geometric pattern extending across at least a portion of the flexible substrate.

52. The patient warming device of claim 37 wherein the at least one conductive path defines a repeating Greek key pattern extending across at least a portion of the flexible substrate.

53. The patient warming device of claim 37 wherein the at least one conductive path includes a first conductive path defining a non-linear pattern, and further comprising at least a second conductive path defining an at least generally linear pattern extending across at least a portion of the flexible substrate, wherein the second conductive path is configured to generate heat by conducting electricity.

54. The patient warming device of claim 37 wherein the at least one conductive path includes a first conductive path defining a non-linear pattern, and further comprising at least a second conductive path defining an at least generally linear pattern extending across at least a portion of the flexible substrate, wherein the second conductive path is configured to generate heat by conducting electricity, and wherein the second conductive path intersects the first conductive path at at least one location on the flexible substrate.

55. The patient warming device of claim 37 wherein the flexible substrate includes a cloth material, and wherein the at least one conductive path includes a plurality of conductive strands interwoven with the cloth material.

56. The patient warming device of claim 37 wherein the flexible substrate includes a cloth material, wherein the at least one conductive path includes a plurality of silver strands interwoven with the cloth material.

57. The patient warming device of claim 37 wherein the conductive paths are at least generally transparent to x-rays.

58. The patient warming device of claim 37 wherein the optical temperature sensing device is at least generally transparent to x-rays.

59. The patient warming device of claim 37 wherein the support portion includes a compressible foam portion that at least generally overlays the flexible substrate.

60. The patient warming device of claim 37 wherein the support portion includes an upper foam pad disposed adjacent to an upper surface of the flexible substrate, the upper foam pad having a thickness of about 1.0 inch or less.

61. The patient warming device of claim 37 wherein the support portion includes a plurality of individual foam particles.

62. The patient warming device of claim 37 wherein the at least one conductive path includes a conductive ink applied to the flexible substrate.

63. The patient warming device of claim 37 wherein the at least one conductive path includes a conductive carbon ink applied to the flexible substrate.

64. The patient warming device of claim 37 wherein the at least one conductive path includes a conductive film applied to the flexible substrate.

65. A personal warming device usable to warm a patient, the personal warming device comprising:

a flexible heating element;

a compressible layer positioned proximate to the heating element and configured to support at least a portion of the patient, wherein the heating element is configured to generate heat by conducting electricity when a patient is positioned on the compressible layer; and

an optical temperature sensing device positioned at least proximate to the heating element and configured to respond to changes in temperature of the warming device, wherein the optical temperature sensing device includes a thermal chromatic liquid crystal.

66. A patient warming device usable to warm a person, the patient warming device comprising:

a contoured support portion having at least one contoured surface configured to support at least part of the person;

a heating element positioned at least proximate to the contoured support portion, the heating element including;

a flexible substrate; and

a plurality of conductive strands supported by the flexible substrate, each of the conductive strands having a core portion and a conductive portion carried by the core portion, wherein each of the conductive strands is configured to generate heat by conducting electricity; and

an optical temperature sensing device positioned at least proximate to the heating element and configured to respond to changes in temperature of the warming device, wherein the optical temperature sensing device includes a thermal chromatic liquid crystal.

67. The patient warming device of claim 66 wherein the flexible substrate includes a cloth material, and wherein the plurality of conductive strands are interwoven with the cloth material.

68. The patient warming device of claim 66 wherein the flexible substrate includes a cloth material, wherein each of the conductive strands includes metallic plating, and wherein the plurality of conductive strands are interwoven with the cloth material.

69. The patient warming device of claim 66 wherein the core portion of each of the conductive strands is at least generally non-conductive.

70. The patient warming device of claim 66 wherein the plurality of conductive strands define a non-linear pattern extending across at least a portion of the flexible substrate.

71. The patient warming device of claim 70 wherein the non-linear pattern includes a repeating geometric pattern extending across at least a portion of the flexible substrate.

72. A patient warming device usable to warm a person, the patient warming device comprising:

a compressible fill layer;

a flexible substrate positioned at least proximate to the fill layer;

at least one conductive path extending across at least a portion of the flexible substrate, wherein the conductive path is configured to generate heat by conducting electricity;

a form-fitting cover enclosing the fill layer, the flexible substrate, and the conductive path; and

an optical temperature sensing device positioned at least proximate to the conductive path and configured to respond to changes in temperature of the warming device, wherein the optical temperature sensing device includes a thermal chromatic liquid crystal.

73. The patient warming device of claim 72 wherein the at least one conductive path defines a repeating Greek key pattern extending across at least a portion of the flexible substrate.

74. The patient warming device of claim 72 wherein the flexible substrate includes a cloth material, and wherein the at least one conductive path includes a plurality of conductive strands interwoven with the cloth material.

75. The patient warming device of claim 72 the conductive paths are at least generally transparent to x-rays.

76. The patient warming device of claim 72 wherein the temperature sensing device is at least generally transparent to x-rays.

77. The patient warming device of claim 72 wherein the fill layer includes a compressible foam portion that at least generally overlays the flexible substrate.

78. The patient warming device of claim 72, further comprising one or more magnets positioned within the cover at least proximate to the fill layer.