Two-piece sensor assembly

• US 6,619,838 B2
• Filed: 08/22/2001
• Issued: 09/16/2003
• Est. Priority Date: 08/22/2001
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Bencini, Robert F., Messing, Katie, Wohlgemuth, Jon
• Primary Examiner(s): Dunn, Drew A.
• Assistant Examiner(s): THOMAS, COURTNEY D
• Application Number:
  US09/935,380
• Publication Number:
  US 20030050558A1
• Time in Patent Office: 755 Days
• Field of Search: 378/190, 378/204, 378/208, 378/189, 250/363.05, 250/363.08, 600/410, 600/411, 600/424, 600/427, 600/429, 600/414, 600/417
• US Class Current: 378/190
• CPC Class Codes: A61B 6/4441 the rigid structure being a C-arm or U-arm
• CPC Class Codes: A61B 6/587 Alignment of source unit to detector unit

Abstract

A sensor assembly that allows a sensor to be detachably mounted onto a fluoroscopic mount, such as a C-arm, is provided. The sensor assembly includes an electromagnetic sensor that is configured for outputting positional data relating to the fluoroscopic mount. The sensor includes a mount engaging element, and the sensor mount includes a sensor engaging element, both of which are configured to be removably mounted in an interference relationship with each other. The mount engaging element of the sensor can be a sensor housing, or alternatively, an element that is separate from the sensor housing. The sensor mount, which is composed of a non-ferromagnetic material, further includes a spacer for maintaining the sensor a prescribed distance from the ferromagnetic fluoroscopic mount, thereby minimizing any adverse ferromagnetic effects on the sensor.

Claims

1. A medical sensor assembly for use with a fluoroscopic mount, comprising:

an electromagnetic sensor configured for outputting positional data relating to said fluoroscopic mount, said sensor comprising a mount engaging element; and

a sensor mount composed of a non-ferromagnetic material, said sensor mount comprising a spacer and a sensor engaging element, wherein said sensor engaging element and said mount engaging element are configured to be removably mounted in an interference relationship with each other, and said spacer is configured to maintain a prescribed distance between said sensor and said fluoroscopic mount.

2. The medical sensor assembly of claim 1, wherein said fluoroscopic mount comprises a fluoroscopic C-arm.

3. The medical sensor assembly of claim 1, wherein said sensor mount is configured in a front-mount arrangement.

4. The medical sensor assembly of claim 1, wherein said sensor mount is configured in a side-mount arrangement.

5. The medical sensor assembly of claim 1, wherein said spacer is configured to be permanently mounted to said fluoroscopic mount.

6. The medical sensor assembly of claim 5, wherein said sensor engaging element is permanently mounted to said spacer.

7. The medical sensor assembly of claim 6, wherein said sensor engaging element and said spacer form a unibody structure.

8. The medical sensor assembly of claim 1, wherein said sensor engaging element is configured to be permanently mounted to said fluoroscopic mount.

9. The medical sensor assembly of claim 8, wherein said mount engaging element comprises said spacer.

10. The medical sensor assembly of claim 9, wherein said sensor comprises a sensor housing that is permanently mounted to said spacer.

11. The medical sensor assembly of claim 8, wherein said mount engaging element is configured to be removably mounted to said sensor engaging element using a hook-in-loop material.

12. The medical sensor assembly of claim 1, wherein said mount engaging element comprises a sensor housing.

13. The medical sensor assembly of claim 1, wherein said spacer comprises a flange, said sensor engaging element comprises a pair of arms extending from said flange, said mount engaging element comprises a member, and said pair of arms is configured for receiving said member therebetween in a snug relationship.

14. The medical sensor assembly of claim 13, wherein said member comprises a shaft and an enlarged rounded end that is configured to be disposed on said pair of arms when said shaft is inserted between said pair of arms.

15. The medical sensor assembly of claim 13, wherein said pair of arms comprises inwardly curving ends that form an aperture between said pair of arms to receive said member.

16. The medical sensor assembly of claim 13, wherein said inwardly curving ends comprise beveled edges.

17. The medical sensor assembly of claim 13, wherein said pair of arms is not coextensive with said flange.

18. The medical sensor assembly of claim 13, wherein said pair of arms is coextensive with said flange.

19. The medical sensor assembly of claim 13, wherein said flange comprises a concave surface for receiving said member.

20. The medical sensor assembly of claim 13, wherein said member comprises a pair of opposing cutouts, and said pair of arms is configured for engaging said cutouts.

21. The medical sensor assembly of claim 13, wherein said member comprises a sensor housing.

22. The medical sensor assembly of claim 1, wherein said mount engaging element comprises a sensor shaft and a pair of oppositely-extending sensor arms to form a general T-shape, said sensor engaging element comprises a pair of sensor holding arms extending from said spacer, said sensor shaft is configured to be inserted between said pair of sensor holding arms, and said pair of sensor arms is configured to be respectively disposed on said pair of sensor holding arms.

23. The medical sensor assembly of claim 22, wherein said pair of sensor arms is substantially coplanar with said sensor shaft.

24. The medical sensor assembly of claim 22, wherein said pair of sensor arms and said pair of sensor holding arms are mounted to each other in a snap-fit arrangement.

25. The medical sensor assembly of claim 24, wherein said pair of sensor arms and said pair of sensor holding arms respectively comprise ridges and indentations that mate with each other.

26. The medical sensor assembly of claim 22, wherein said pair of sensor arms comprises ends that curve towards said sensor shaft to engage said sensor holding arms.

27. The medical sensor assembly of claim 1, wherein said mount engaging element comprises a member, and said sensor engaging element comprises an open cavity configured to receive said member in a direction substantially perpendicular to a plane in which said sensor mount is mounted.

28. The medical sensor assembly of claim 27, wherein said open cavity is formed in said spacer.

29. The medical sensor assembly of claim 28, wherein said sensor comprises a wire extending therefrom, and said spacer comprises a channel extending from said open cavity to the exterior of said spacer to receive said sensor wire.

30. The medical sensor assembly of claim 27, wherein said open cavity is configured to receive said member in a snap-fit arrangement.

31. The medical sensor assembly of claim 27, wherein said open cavity is substantially circular, and said member is oblong, said member being mounted along the diameter of said circular open cavity.

32. The medical sensor assembly of claim 27, wherein the shape of said open cavity and the shape of said member are substantially similar.

33. The medical sensor assembly of claim 32, wherein the shape of said open cavity and the shape of said member are substantially non-circular.

34. The medical sensor assembly of claim 27, wherein the shape of said open cavity and the shape of said member are hexagonal.

35. The medical sensor assembly of claim 27, wherein each of said open cavity and said member comprises at least two lateral edges that engage each other when said open cavity receives said member.

36. The medical sensor assembly of claim 35, wherein said at least two lateral edges of said member comprise one of ridges or indentations, and said at least two lateral edges of said open cavity comprise another of said ridges or indentations.

37. The medical sensor assembly of claim 27, wherein said cavity has a partially circular cross-sectional shape with a first diameter and an arc extending at least 180 degrees, and said member has a cross-sectional shape with a second diameter substantially similar to said first diameter.

38. The medical sensor assembly of claim 37, wherein said cavity is oblong and comprises a first pair of substantially perpendicular opposing extensions, and said member is oblong and comprises a second pair of substantially perpendicular opposing extension that are configured to be received by said first pair of substantially perpendicular opposing extensions.

39. The medical sensor assembly of claim 27, wherein said member comprises a barb, and said sensor engaging element further comprises a hole formed within said open cavity to receive said barb.

40. The medical sensor assembly of claim 39, wherein said member and said open cavity each have an oblong shape, and said barb extends substantially perpendicular to said member.

41. The medical sensor assembly of claim 27, wherein said member comprises a sensor housing.

42. The medical sensor assembly of claim 1, wherein said mount engaging element comprises a conical member, and said sensor engaging element comprises a conical cavity for receiving said conical member.

43. The medical sensor assembly of claim 42, wherein said conical cavity is formed within said spacer.

44. The medical sensor assembly of claim 43, wherein said sensor comprises a sensor wire extending therefrom, and said spacer comprises a slit configured to receive said sensor wire, said slit extending from said conical cavity to the exterior of said spacer.

45. The medical sensor assembly of claim 44, wherein said slit is oriented substantially parallel to the axis of said conical cavity.

46. The medical sensor assembly of claim 42, wherein said conical member comprises a sensor housing.

47. The medical sensor assembly of claim 46, wherein said non-circular cross-section is D-shaped.

48. The medical sensor assembly of claim 46, wherein said cavity is formed within said spacer.

49. The medical sensor assembly of claim 44, wherein said clip receiving means is configured to receive said clip in a direction parallel to a plane in which said sensor is mounted.

50. The medical sensor assembly of claim 44, wherein said clip receiving means comprises a cavity, said cavity and said clip having matching non-circular cross-sections.

51. The medical sensor assembly of claim 44, wherein said clip receiving means comprises a handle formed on said spacer.

52. The medical sensor assembly of claim 51, wherein said sensor engaging element further comprises a pair of sensor holding arms that extend from said spacer to receive said sensor housing.

53. The medical sensor assembly of claim 44, wherein said clip receiving means comprises an elastomer slit formed in said spacer.

54. The medical sensor assembly of claim 44, wherein said clip receiving means comprises an L-shaped flange formed on said spacer.

55. The medical sensor assembly of claim 44, wherein said clip receiving means comprises a spring clip.

56. The medical sensor assembly of claim 55, wherein said clip receiving means comprises a cutout for receiving said sensor housing.

57. The medical sensor assembly of claim 1, wherein said mount engaging element comprises a sensor housing and a clip disposed thereon, and said sensor engaging element comprises means for receiving said clip.

58. The medical sensor assembly of claim 1, wherein said sensor engaging element comprises one of a member and cavity, said mount engaging element comprises another of said member and cavity, and said member and cavity have substantially uniform and complementary cross-sections, such that said member and said cavity are configured to slidingly engage each other.

59. The medical sensor assembly of claim 58, wherein said member and said cavity slidingly engage each other in a direction substantially parallel to a plane in which said sensor mount is mounted.

60. The medical sensor assembly of claim 58, wherein said sensor engaging element comprises said member, and said mount engaging element comprises said cavity.

61. The medical sensor assembly of claim 58, wherein said sensor engaging element comprises said cavity, and said mount engaging element comprises said member.

62. The medical sensor assembly of claim 58, wherein said one of said member and cavity comprises a protuberance, and said other of said member and cavity comprises an indentation that engages said protuberance when said member is fully engaged within said cavity.

63. The medical sensor assembly of claim 58, wherein said member comprises a key, and said cavity comprises a key slot that engages said key when said member is slidingly engaged within said cavity.

64. The medical sensor assembly of claim 58, wherein said member comprises a detent, and said cavity comprises an aperture that engages said detent when said member is fully engaged with said cavity.

65. The medical sensor assembly of claim 58, wherein said member comprises a pair of opposing slots that substantially extends the length of said member, and said cavity comprises a pair of opposing ridges that substantially extends the length of said cavity.

66. The medical sensor assembly of claim 58, wherein said complementary cross-sections are T-shaped.

67. The medical sensor assembly of claim 58, wherein said complementary cross-sections are ellipsoidal.

68. The medical sensor assembly of claim 67, wherein said ellipsoidal complementary cross-sections each comprise lateral opposing extensions.

69. The medical sensor assembly of claim 58, wherein said complementary cross-sections are trapezoidal.

70. The medical sensor assembly of claim 58, wherein said complementary cross-sections are rectangular.

71. The medical sensor assembly of claim 58, wherein said sensor comprises a finger handle.

72. The medical sensor assembly of claim 58, wherein said mount engaging element comprises a sensor housing.

73. The medical sensor assembly of claim 1, wherein said sensor engaging element comprises one of a first matching snap protuberance and a snap hole, said mount engaging element comprises another of said first matching snap protuberance and snap hole, and said first matching snap hole and said first matching snap protuberance are configured to respectively snap together.

74. The medical sensor assembly of claim 73, wherein said one of a snap protuberance and snap hole comprises a snap protuberance, and said other one of a snap protuberance and a snap hole comprises a snap hole.

75. The medical sensor assembly of claim 73, wherein said sensor engaging element comprises one of a second matching snap protuberance and a snap hole, said mount engaging element comprises another of said second matching snap protuberance and snap hole, and said second matching snap hole and said snap protuberance are configured to respectively snap together.

76. The medical sensor assembly of claim 75, wherein said one of said first matching snap protuberance and a snap hole and said one of said second matching snap protuberance and a snap hole each comprises a snap protuberances, said other of said first matching snap protuberance and a snap hole and said other of said second matching snap protuberance and a snap hole each comprises a snap hole.

77. The medical sensor assembly of claim 1, wherein said sensor comprises a sensor housing, said mount engaging element comprises a rigid planar member, said sensor engaging element comprises a flexible planar member that is configured to be removably attached to said spacer when said rigid planar member is disposed on said spacer, and said sensor engaging element comprises an aperture through which said sensor housing can fit, but through which said rigid planar member cannot fit.

78. The medical sensor assembly of claim 77, wherein said flexible planar member is configured to be removably mounted to said spacer using a hook-in-loop material.

79. A medical sensor assembly for use with a fluoroscopic mount, comprising:

an electromagnetic sensor configured for outputting positional data relating to said fluoroscopic mount, said sensor comprising a mount engaging element; and

a sensor mount composed of a non-ferromagnetic material, said sensor mount comprising a spacer and a sensor engaging element, wherein said sensor engaging element and said mount engaging element are removably mounted in an interference relationship with each other, and said spacer is configured to maintain a prescribed distance between said sensor and said fluoroscopic mount.

80. The medical sensor assembly of claim 79, wherein said fluoroscopic mount comprises a fluoroscopic C-arm.

81. The medical sensor assembly of claim 79, wherein said sensor mount is configured in a front-mount arrangement.

82. The medical sensor assembly of claim 79, wherein said sensor mount is configured in a side-mount arrangement.

83. The medical sensor assembly of claim 79, wherein said spacer is configured to be permanently mounted to said fluoroscopic mount.

84. The medical sensor assembly of claim 83, wherein said sensor engaging element is permanently mounted to said spacer.

85. The medical sensor assembly of claim 84, wherein said sensor engaging element and said spacer form a unibody structure.

86. The medical sensor assembly of claim 79, wherein said sensor engaging element is configured to be permanently mounted to said fluoroscopic mount.

87. The medical sensor assembly of claim 86, wherein said spacer is removably mounted to said sensor engaging element.

88. The medical sensor assembly of claim 87, wherein said mount engaging element is permanently mounted to said spacer.

89. The medical sensor assembly of claim 86, wherein said spacer is removably mounted to said sensor engaging element using a hook-in-loop material.

90. The medical sensor assembly of claim 79, wherein said mount engaging element comprises a sensor housing.

91. A medical image-acquisition device, comprising:

a fluoroscopic mount;

an electromagnetic sensor configured for outputting positional data relating to said fluoroscopic mount, said sensor comprising a mount engaging element; and

a sensor mount composed of a non-ferromagnetic material, said sensor mount comprising a spacer and a sensor engaging element, wherein said sensor engaging element and said mount engaging element are removably mounted in an interference relationship with each other, and said spacer is configured to maintain a prescribed distance between said sensor and said fluoroscopic mount.

92. The medical image-acquisition device of claim 91, wherein said fluoroscopic mount comprises a fluoroscopic C-arm.

93. The medical image-acquisition device of claim 91, wherein said sensor mount is configured in a front-mount arrangement.

94. The medical image-acquisition device of claim 91, wherein said sensor mount is configured in a side-mount arrangement.

95. The medical image-acquisition device of claim 91, wherein said spacer is permanently mounted to said fluoroscopic mount.

96. The medical image-acquisition device of claim 95, wherein said sensor engaging element is permanently mounted to said spacer.

97. The medical image-acquisition device of claim 96, wherein said sensor engaging element and said spacer form a unibody structure.

98. The medical image-acquisition device of claim 91, wherein said sensor engaging element is permanently mounted to said fluoroscopic mount.

99. The medical image-acquisition device of claim 98, wherein said spacer is removably mounted to said sensor engaging element.

100. The medical image-acquisition device of claim 99, wherein said mount engaging element is permanently mounted to said spacer.

101. The medical image-acquisition device of claim 98, wherein said spacer is removably mounted to said sensor engaging element using a hook-in-loop material.

102. The medical image-acquisition device of claim 91, wherein said mount engaging element comprises a sensor housing.