JP2020048665A - Magnetic field generator holding device - Google Patents

Abstract

To provide a compact holding device for holding a magnetic field generator in the vicinity of a surgical table.SOLUTION: A surgical table is provided with a rail 44, and a holding device 42 is attached to the rail 44 through an attachment mechanism 46. The holding device 42 includes a support mechanism 48 and a holder 50. A magnetic field generator 40 is held by the holder 50. The support mechanism 48 includes a shaft 62, a horizontal arm 64, and a rotary table. The support mechanism 48 has a biaxial rotary structure, and, by using it, the position and the direction of the magnetic field generator 40 are adjusted.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a magnetic field generator holding device, and more particularly to a device for holding a magnetic field generator used in an operating theater.

  In the medical field, a positioning system using a magnetic field is used. For example, at the time of ultrasonic diagnosis, a magnetic field generator is provided near a subject, and a magnetic sensor is provided on an ultrasonic probe (see Patent Document 1). A special magnetic field for positioning generated in the magnetic field generator is detected by the magnetic sensor. Based on the detection signal, the position and the posture of the ultrasonic probe, more specifically, the position and the posture of the scanning surface are specified. Such a positioning system is used in, for example, RVS (Real-time Virtual Sonography). The RVS simultaneously displays a real-time tomographic image and a corresponding MPR (Multi-Planar Reconstruction) image. An MPR image is formed using the position information of the scanning surface.

JP 2018-23677 A WO 2007/074532 (particularly FIG. 13)

  The positioning system is also used in an operating room. In the operating room, various devices such as an operating table and medical devices are arranged, and there are not a few medical staffs (doctors, nurses, etc.) in the operating room. In general, there is not much space available around the operating table. In order for the above positioning system to function, it is desired that the magnetic field generator be installed near the patient (subject). However, a large-scale mechanism (for example, a stand) for holding the magnetic field generator around the operating table is installed. It is difficult to secure the space to be used. Even if such a mechanism could be set up, it could interfere with medical staff. Even if an articulated arm is provided for an ultrasonic diagnostic apparatus installed in an operating room and a magnetic field generator is held by the articulated arm, a similar problem may occur.

  An object of the present invention is to realize a compact magnetic field generator holding device that holds a magnetic field generator near an operating table.

  The magnetic field generator holding device according to the present invention includes a holder that holds a magnetic field generator that generates a positioning magnetic field, a support having a column that has a vertically elongated form, and a support mechanism that supports the holder. Wherein the support is held by an attachment mechanism connected to an operating table.

  According to the present invention, a relatively small magnetic field generator holding device that holds a magnetic field generator near an operating table can be provided. Therefore, the magnetic field generator can be installed at an appropriate position with respect to the patient, or the magnetic field generator holding device can be prevented or reduced from disturbing the medical staff in the operating room.

FIG. 2 is a schematic diagram illustrating a state of an operating room including a positioning system. It is a perspective view showing the front side of the magnetic field generator holding device concerning an embodiment. It is the perspective view showing the back side of the magnetic field generator holding device concerning an embodiment. It is a figure for explaining a biaxial rotation structure which a magnetic field generator holding device has. It is a figure for explaining the detailed structure of a magnetic field generator holding device. It is a perspective view showing the frame arranged in the holder. It is a perspective view which shows holding | maintenance of a magnetic field generator by a flame | frame. It is a figure showing the example of use of the magnetic field generator holding device provided with a standard shaft. It is a figure showing the example of use of the magnetic field generator holding equipment provided with a long shaft. It is a figure for explaining an operation of a biaxial rotation structure. It is a figure showing the 1st modification of a magnetic field generator holding device. It is a figure showing the 2nd modification of a magnetic field generator holding device.

  Hereinafter, embodiments will be described with reference to the drawings.

(1) Outline of Embodiment A magnetic field generator holding device (hereinafter, referred to as a “holding device”) according to an embodiment includes a holder and a support mechanism. The holder is a member that holds a magnetic field generator that generates a positioning magnetic field. The support mechanism is a mechanism that includes a column that has a form that extends in the vertical direction and that supports the retainer. The support is held by an attachment mechanism connected to the operating table.

  In general, the operating table base is provided with rails on both sides or around it. Various members required for surgery are attached to the rail via an attachment mechanism. The attachment mechanism can usually be installed at any position on the rail. The attachment mechanism generally has an opening into which a member having a predetermined shape (a cylindrical shape or a prismatic shape) is inserted, and a mechanism that clamps the member inserted into the opening.

  The holding device according to the embodiment is mounted on an operating table using an existing rail and an attachment mechanism. The height of the holding device is determined while the strut of the holding device is inserted into the opening of the attachment mechanism, and then the strut is clamped. The column has a vertically elongated form, and the height of the retainer can be easily adjusted by changing the clamp position. As described above, according to the embodiment, the magnetic field generator can be easily installed at a desired position, and a large-scale mechanism is not required. Therefore, the magnetic field generator can be easily installed near the patient. Further, it is possible to reduce the possibility that the holding device hinders the work of the medical staff.

  In the embodiment, the column is a shaft member held at an arbitrary rotation angle by the attachment mechanism. The support mechanism has a form extending in the horizontal direction, an arm having a base end connected to the upper end of the shaft member and a turning end on the opposite side, and is provided at the turning end of the arm, A turntable that rotatably supports the retainer.

  According to this configuration, it is possible to cause the arm and the retainer to rotate (swirl) around the shaft member as the center of rotation. Further, the rotating table allows the retainer to rotate around its central axis. With such a biaxial rotation structure, the holder can be moved closer to or farther from the operating table depending on the situation, and the orientation of the holder can be adjusted independently.

  Generally, a magnetic field generator has directivity, that is, a recommended space is defined in the magnetic field generator as a space in which detection by a magnetic sensor can be stably performed. The recommended space depends on the magnetic field generator, but is a space extending to a specific side with respect to the magnetic field generator, and is a space relatively close to the magnetic field generator. According to the above configuration, it is easy to match the recommended space with the surgical site or the ultrasonic probe. The positioning accuracy can be maintained or improved by stable magnetic field detection.

  In the embodiment, the turntable has a lock mechanism that locks the rotation angle of the holder with respect to the arm. The turntable is locked by this lock mechanism. The rotation angle of the shaft member is locked by the attachment mechanism. A mechanism for performing the locking may be provided in the holding device.

  In the embodiment, the retainer has a form extending in the horizontal direction from a central portion to which the turntable is attached, and a bottom wall on which the magnetic field generator is mounted, and an end of the bottom wall surrounding the magnetic field generator. And a peripheral wall standing up from The peripheral wall surrounds all or a part of the periphery of the magnetic field generator, and the peripheral wall functions as a guard wall. That is, the peripheral wall prevents or reduces the contact or collision of the member or the living body with the magnetic field generator. Even in cases where contact and collision problems do not occur, it is safe for patients and other people if the relatively heavy magnetic field generator is easily surrounded by a relatively heavy magnetic field generator with little consideration for design and rugged impression. Gives a feeling. It is desirable that at least the front side and both side faces of the magnetic field generator are surrounded by the peripheral wall.

  The holding device according to the embodiment has a handle that takes a standing posture and a lying posture. The handle is attached to the holder so as to straddle the magnetic field generator in the upright posture, and falls from the upright posture to the back side of the magnetic field generator to assume a sideways posture. Usually, the magnetic field generator has a corresponding weight and is provided with a handle for safe transportation. The handle can also be used when adjusting the position and posture of the retainer. When the magnetic field generator is in operation, if the handle falls down on the rear side of the magnetic field generator, adverse effects on the magnetic field by the handle are avoided or mitigated. Even if there is a place where no peripheral wall is provided on the back side of the magnetic field generator, the place is guarded by the handle in the falling posture.

  According to the embodiment, a safety mechanism is provided for stopping dropping of the support in the middle while the holding by the attachment mechanism is released. For example, a plurality of through-holes are formed at a plurality of heights with respect to the column, and a pin is inserted into any of the plurality of through-holes. It may be.

(2) Details of Embodiment FIG. 1 schematically shows the inside of an operating room. An operating table 12 is provided in the operating room 10. A patient 14 is placed on an operating table 12. Around the operating table 12, instrument tables 16 and 18 for placing surgical instruments and the like are provided, and an anesthesia machine 20, an electrosurgical unit 22, an ultrasonic diagnostic apparatus main body 24 and the like are provided. A plurality of medical staffs exist around the operating table 12, and specifically, a surgeon 26, a first assistant 28, a second assistant 30, an anesthesiologist 32, nurses 34, 35, 36, and the like exist. ing.

  The positioning system includes a magnetic field generator 40 and a magnetic sensor. The magnetic sensor is provided in an ultrasonic probe (intraoperative probe) 38, and a magnetic field for positioning generated by a magnetic field generator 40 is detected by the magnetic sensor. The detection signal of the magnetic sensor is sent to a positioning controller (not shown). The positioning controller calculates a position and a posture of a scanning plane formed by the ultrasonic probe based on the detection signal. Position information indicating the calculation result is used in image formation in the ultrasonic diagnostic apparatus main body 24. The ultrasonic diagnostic apparatus includes an ultrasonic diagnostic apparatus main body 24 and an ultrasonic probe 38. The positioning controller may be incorporated in the ultrasonic diagnostic apparatus main body 24.

  The magnetic field generator 40 is held by the holding device (magnetic field generator holding device) 42 according to the embodiment. The holding device 42 is attached to a rail of the operating table 12 via an attachment mechanism, as described in detail later. According to the holding device 42, the position and posture of the magnetic field generator can be easily adjusted, and for example, the magnetic field generator 40 can be easily brought closer to the patient 14. In the illustrated example, the surgical site in the patient is the abdomen 14A, particularly the liver, and the ultrasonic probe 38 abuts on the exposed liver surface in the open state. In that state, an ultrasound examination of the inside of the liver is performed. The magnetic field generator 40 usually has directivity, for which a recommended space (a space in which magnetic field detection can be appropriately performed) is defined. According to the embodiment, it is easy to match the recommended space 41 with the movement space of the ultrasonic probe 38.

  FIG. 2 is a perspective view illustrating the front side of the holding device 42 according to the embodiment. The operating table includes an operating table base 12A, legs supporting the operating table base, a cushion member (mattress) provided on the operating table base 12A, and the like. Cushion members having various thicknesses are prepared, and a cushion member to be used is selected from them. A typical cushion member has a thickness of, for example, 15 cm.

  The operating table base 12A is configured as a metal housing, and rails 44 are provided on both sides or around the rails (a part of the rails 44 is shown in FIG. 2). The cross-sectional shape of the rail 44 includes a rectangle, a circle, and the like. The rail 44 is fixed to the operating table base 12A via a plurality of connecting members 45. The attachment mechanism 46 can be attached to an arbitrary position on the rail 44.

  The holding device 42 is a device that holds the magnetic field generator 40. The holding device 42 has a support mechanism 48 and a holder (holder) 50. The shaft in the support mechanism 48 is held and clamped by the attachment mechanism 46. That is, in the embodiment, the holding device 42 is a compact mechanism attached to the operating table. The front of the magnetic field generator 40 is indicated by reference numeral 40a. In FIG. 2, the x direction is the operating table longitudinal direction as the first horizontal direction, the y direction is the operating table short direction as the second horizontal direction, and the z direction is the vertical (vertical) direction. In the example shown in FIG. 2, the holding device 42 is attached to the left side of the operating table, but that is only an example. The magnetic field generator 40 has a weight in the range of, for example, 1 to 3 kg.

  FIG. 3 is a perspective view showing the back side of the holding device 42 according to the embodiment. The rail 44 has a rectangular cross section, and the longitudinal direction of the rectangular cross section is the z direction in the illustrated example (a part of the rail 44 is also shown in FIG. 3).

  The attachment mechanism 46 includes a mounting base 52 having an insertion groove, a protrusion 54 fixed to the mounting base 52, and a rotation shaft 56. The rail 44 is inserted into the insertion groove so that the mounting table 52 straddles the rail 44. The rotating shaft 56 is provided with a handle 58, which constitutes a part of a clamp mechanism (lock mechanism). The projecting body 54 has a hole 60 extending in the z direction, into which a shaft 62 described later is inserted. When the rotating shaft 56 is rotated in one direction in a state where the shaft 62 is inserted into the hole 60, the rail 44 is clamped by the mount 52, and at the same time, the shaft 62 is clamped in the protrusion 54. The illustrated attachment mechanism 46 is an example, and various attachment mechanisms are provided according to the operating table. In any case, each attachment mechanism usually has an opening corresponding to the hole 60 described above. The openings usually have a circular cross section. Openings having a rectangular cross section are also known.

  The holding device 42 is roughly composed of a support mechanism 48 and a holder 50. The support mechanism 48 is a mechanism that supports the holder 50, and the holder 50 is a mechanism that holds the magnetic field generator 40. The support mechanism 48 has a shaft 62 as a shaft member, a horizontal arm 64, a turntable, and the like in the illustrated configuration example. The shaft 62 has a tapered lower end 62A and an enlarged upper end 62B. The shaft 62 is inserted into the hole 60, and an intermediate portion of the shaft 62 is clamped.

  The horizontal arm 64 has a horizontally elongated configuration, which has a proximal end 64A and a pivot end 64B. The base end 64A is integrally connected to the upper end 62B of the shaft 62. The shaft 62 and the horizontal arm 64 integrally rotate (turn) around the central axis of the shaft 62. A turntable is provided at the turning end 64B of the horizontal arm 64, and the holder 50 is supported by the turntable. The turntable has a shaft member 66, and the retainer 50 rotates around a central axis of the shaft member 66. A lock mechanism is provided on the turntable, and the rotation of the holder 50 is locked by its operation.

  The holder 50 holds the block-shaped magnetic field generator 40. The retainer 50 is provided with a handle 68 that rotates around a horizontal axis 70. The handle 68 has an upright posture (see FIGS. 4 and 5 described later) and a sideways posture (see FIG. 3). In the sideways posture, the handle 68 falls on the back side of the magnetic field generator. A groove-shaped notch 50A is provided on the back side of the retainer 50, and a cable 40b extending from the magnetic field generator 40 is drawn through the notch 50A.

  The retainer 50 is made of, for example, a resin (specifically, ABS resin: acrylonitrile, butadiene, butadiene, styrene (Styrene) copolymer synthetic resin) except for a frame described later. If the retainer 50 is made of such a resin, the influence on the magnetic field can be ignored. The handle 68 is made of, for example, stainless steel. Even if stainless steel is used, the magnetic field may be affected by processing or the like, and the handle 68 is configured to fall down to the back side of the magnetic field generator 40. The handle 68 may be made of resin or other members. The support mechanism 48 is made of a metal member. The same applies to the attachment mechanism 46. Note that the shaft 62 is provided with a plurality of horizontal holes at regular intervals in the vertical direction. The pin 72 is inserted into one of the side holes. The plurality of lateral holes and the pins 72 function as drop prevention means.

  The biaxial rotation structure of the support mechanism 48 will be described with reference to FIG. The support mechanism 48 includes a rod-shaped shaft 62 having a form extending in the z direction, a horizontal arm 64 having a form extending in the horizontal direction, a turntable 74 mounted on a turning end of the horizontal arm 64, and the like. A shaft member 66 is provided at the center of the turntable 74. When observed in the z direction, the shaft 62 is a long member, and the turntable 74 or the shaft member 66 therein is a short member that is considerably shorter than the shaft 62. The central axis of the shaft 62 forms the first rotation axis 76. The central axis of the shaft member 66 forms the second rotation shaft 78. Both the first rotation shaft 76 and the second rotation shaft 78 are parallel to the z direction.

  The distance 80 between them is, for example, in the range of 2 to 12 cm. The length of the shaft 62 in the z direction (the distance from the lower end of the shaft 62 to the lower surface of the horizontal arm 64) is, for example, in the range of 15 to several tens of cm. The distance from the upper surface of the horizontal arm 64 to the lower surface of the retainer 50 is, for example, several cm. The numerical values described in the present specification are all examples.

  Around the first rotation axis 76, the horizontal arm 64, the turntable 74, and the holder 50 perform a first rotation movement (swing movement). The turntable 74 and the holder 50 perform a second rotation around the second rotation axis 78. The first rotational movement adjusts the distance between the operating table and the magnetic field generator. When the horizontal arm 64 faces the operating table, the front portion (jaw portion) of the holder 50 protrudes above the cushion member of the operating table. The direction of the magnetic field generator can be independently and arbitrarily determined by the second rotational movement. Reference numeral 81 indicates a lock mechanism. The lock mechanism 81 has a function of stopping and holding the rotational movement of the shaft member 66. The lock mechanism 81 has a knob, and the knob is operated at the time of locking and unlocking.

  FIG. 5 shows the back side of the holding device. As described above, the shaft 62 has the plurality of lateral holes 82a, 82b, and 82c formed in the vertical direction. Each of the lateral holes 82a, 82b, 82c is a through hole. The pin 72 is inserted into one of the side holes. When the clamping force by the attachment mechanism is lost, the entire holding device including the magnetic field generator falls downward. At this time, the pin 72 hits the attachment mechanism, and further falling is prevented. It is desirable to select a lateral hole into which the pin 72 is to be inserted from a plurality of lateral holes 82a, 82b, 82c according to the holding height of the shaft 62 by the attachment mechanism. However, the upper end of the shaft 62 is enlarged, which also functions as a fall prevention unit.

  An arched cover 84 surrounding the cable 40b is provided at the rear of the retainer 50. By passing the cable 40b through the cover 84, the root of the cable 40b can be protected, and even if the magnetic field generator is detached from the holder 50, the falling motion of the magnetic field generator can be limited. Becomes

  FIG. 6 shows the inside of the retainer 50. The retainer 50 has a dish shape, and specifically has a flat bottom wall 50B and a peripheral wall 50C rising from the periphery thereof. A turntable is connected to the lower surface side of the center of the bottom wall 50B. That is, the bottom wall 50B extends in the horizontal direction around the mounting portion of the turntable. A frame 86 is disposed inside the holder 50. The frame 86 is made of, for example, stainless steel. The left and right ends of the frame 86 stand upright, and the horizontal shaft 70 is provided at the left and right ends. The handle 68 rotates about the horizontal axis 70 as the center of rotation. In FIG. 6, the handle 68 is in a standing posture, from which the handle 68 falls down to the rear side. As a result, a sideways posture of the handle 68 is generated.

  At the front of the frame 86, a pair of hooks 88 are provided on the right and left sides. As shown in FIG. 7, the lower portion of the magnetic field generator slightly projects in the horizontal direction to form a pair of protrusions 40c. The pair of projections 40c are inserted into the pair of hooks 88, and an engagement between the magnetic field generator and the frame occurs. For example, two screw holes are formed in the bottom portion on the rear side of the magnetic field generator, and the magnetic field generator is screwed on the rear side using these holes. In this way, the magnetic field generator is fixed to the holder on the front side and the rear side of the magnetic field generator.

  FIG. 8 shows a holding device provided with a shaft (standard shaft) 62. A cushion member 90 is provided on the operating table base 12A. The height and orientation of the holder 50 are adjusted so that the front part of the holder 50 protrudes toward the upper surface of the cushion member 90 or is placed on the upper surface thereof. The retainer 50 is supported by the support mechanism 48. The shaft 62 of the support mechanism 48 is held by the attachment mechanism 46. By adjusting the clamp position of the shaft 62 by the attachment mechanism 46, the height of the retainer 50 can be easily adjusted according to the thickness of the cushion member 90.

  FIG. 9 shows a holding device having a long shaft 92. A fairly thick cushion member 94 is provided on the operating table base 12A. In the example shown in FIG. 9 as well, the height and direction of the retainer 50 are adjusted so that the front portion of the retainer 50 protrudes toward the upper surface of the cushion member 94 or is placed on the upper surface. ing. The support mechanism 48 has a long shaft 92, and the retainer 50 is held at a relatively high position. Also in this configuration example, the height of the retainer 50 can be easily adjusted according to the thickness of the cushion member 94 by adjusting the clamp position of the shaft by the attachment mechanism 46.

  The operation of the above-described biaxial rotation structure will be described with reference to FIG. FIG. 10 is a schematic view, and (A), (B) and (C) show three states. As described above, the position of the holder 50 in the y direction can be adjusted by the support mechanism 48, and the direction of the holder 50 can be adjusted. Incidentally, the position of the retainer 50 in the x direction can be adjusted by changing the attachment position of the attachment function to the rail. In FIG. 10, reference numeral 62 denotes a shaft, and reference numeral 66 denotes a shaft member in the turntable.

  In the states shown in (A), (B) and (C), the orientation of the retainer 50 is substantially the same. Irrespective of the turning angle of the horizontal arm 64, the rotation of the holder 50 by the shaft member 66 allows the direction thereof to be adjusted independently. The position of the retainer 50 in the y direction is changed according to the turning angle of the horizontal arm 64. The position of the left end of the operating table base in the x direction is indicated by reference numeral 100.

  In the state shown in (A), the horizontal arm 64 faces the positive side in the x direction, and the retainer 50 protrudes greatly in the x direction. The maximum projecting position is indicated by reference numeral 102. The protrusion amount is indicated by reference numeral 104. In the state shown in (B), the horizontal arm 64 is pivoted slightly rearward, and the maximum projecting position 102 of the retainer 50 is shifted to the Y direction negative side from the maximum projecting position 102 shown in (A). doing. The protrusion amount at that time is indicated by reference numeral 106. In the state shown in (C), the horizontal arm 64 is turning to the negative side in the y direction, and the maximum projecting position 102 at that time is on the negative side. That is, a negative protrusion amount 108 occurs.

  As described above, since the support mechanism has the biaxial rotation structure, it is possible to change the distance of the magnetic field generator from the operating table or the patient. In particular, it is possible to easily bring the magnetic field generator close to the patient. Moreover, it is possible to adjust the orientation of the magnetic field generator regardless of the position of the magnetic field generator with respect to the patient. This makes it possible to easily match the recommended space defined for the magnetic field generator with the ultrasonic probe movement space.

  FIG. 11 shows a first modification. The holding device 110 has a support mechanism 112 and a holder 114. The support mechanism 112 corresponds to the support mechanism 48 shown in FIG. The holder 114 is formed in a small size, so that a small magnetic field generator 116 is held. The size of the holder 114 is determined according to the holding target. The retainer may be configured to be replaceable.

  FIG. 12 shows a second modification. The holding device 120 has a support mechanism 122 and a holder 124. The support mechanism 122 has a vertical piece 126A, a horizontal piece 126B, and a pedestal 126C. It is desirable to use a rotating pedestal as the pedestal 126C. The vertical piece 126A has a rectangular horizontal cross section, which is inserted and clamped into a rectangular opening in the attachment function. When this configuration is adopted, the position of the magnetic field generator can be made closer to the patient depending on the crank configuration. From the viewpoint of adjusting the distance and the direction, it is desirable to adopt the configuration shown in FIG. 2 and the like and the configuration shown in FIG.

  According to the holding device according to the embodiment, it is possible to install the magnetic field generator by utilizing the existing rail and attachment mechanism. Since the holding device can be miniaturized, the degree of freedom of its installation can be increased. In particular, the magnetic field generator can be easily installed at a desired position in a desired direction. In the embodiment, the peripheral wall surrounds the periphery of the magnetic field generator, and the peripheral wall functions as a guard wall. Thereby, contact or collision of the member or the living body with the magnetic field generator is prevented or reduced. Even in the case where the problem of contact and collision does not occur, if the relatively heavy magnetic field generator is surrounded by the peripheral wall, the patient and others can be reassured. During operation of the magnetic field generator, the handle falls down on the rear side of the magnetic field generator, so that the adverse effect of the handle on the magnetic field is avoided or mitigated. Even if there is a place where no peripheral wall is provided on the back side of the magnetic field generator, the place is guarded by the handle in the falling posture.

40 magnetic field generator, 42 holding device, 44 rail, 46 attachment mechanism, 48 support mechanism, 50 holder, 68 handle.

Claims (6)

A holder for holding a magnetic field generator for generating a positioning magnetic field,
A support mechanism having a column having a vertically elongated form, and supporting the retainer,
Including
The strut is held by an attachment mechanism connected to the operating table,
A magnetic field generator holding device, characterized in that: The magnetic field generator holding device according to claim 1,
The support is a shaft member held at an arbitrary rotation angle by the attachment mechanism,
The support mechanism,
An arm having a horizontally elongated configuration, having a base end connected to the upper end of the shaft member and a turning end opposite to the base end;
A turntable that is provided at the turning end of the arm and rotatably supports the retainer;
A magnetic field generator holding device comprising: The magnetic field generator holding device according to claim 2,
The turntable has a lock mechanism for locking a rotation angle of the retainer with respect to the arm,
A magnetic field generator holding device, characterized in that: The magnetic field generator holding device according to claim 2,
The retainer is
A bottom wall on which the magnetic field generator is mounted, having a form extending in a horizontal direction from a central portion to which the turntable is attached,
A peripheral wall rising from an end of the bottom wall so as to surround the magnetic field generator;
A magnetic field generator holding device comprising: The magnetic field generator holding device according to claim 1,
A handle attached to the holder so as to straddle the magnetic field generator in the upright posture, including a handle that falls down to the back side of the magnetic field generator from the upright posture to be in a sideways posture,
A magnetic field generator holding device, characterized in that: The magnetic field generator holding device according to claim 1,
Including a safety mechanism for stopping the drop of the support in the state in which the holding by the attachment mechanism is released,
A magnetic field generator holding device, characterized in that: