JP2522221B2 - X-ray fluoroscopy stand - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray tube and an X-ray detecting means for performing X-ray fluoroscopic imaging in a subject, and an X-ray fluoroscopic imaging table supporting a top plate for mounting the subject.

[0002]

[Prior art]

<First Conventional Example> FIG. 7 shows an X-ray fluoroscopic imaging table of a first conventional example. 7A is a side view and FIG. 7B is a plan view.
A top support arm 3 having a U-shape in a plan view is attached to a base 2 erected on the floor. Top plate support arm 3
Is configured to be vertically movable in the Y-axis direction with respect to the base 2, and is also configured to be rotatable about the X-axis center. A top plate 4 for mounting a subject is supported movably in the X-axis direction on the tip of a top plate support arm 3 protruding in the X-axis direction. The protruding portion of the top plate supporting arm 3 is configured to be bendable midway, and by bending, the top plate 4 supported at the tip portion is moved up and down.

A guide rail 5 extending in the Z-axis direction is laid on the top plate supporting arm 3, and an arm holder 9 is rotatable around an X-axis center on a moving member 10 which moves along the guide rail 5. Is attached to. The arm holder 9 supports the C-shaped arm 8 rotatably around the Z axis. An X-ray tube 7 for X-ray irradiation is provided at both ends of the C-arm 8.
And an X-ray image intensifier 6 for converting transmitted X-rays into an optical image are attached in a state of facing each other. X
The line image intensifier 6 is provided with an X-ray television camera that converts the output light image into an electric signal (video signal), and an X-ray perspective image is displayed on a monitor display (not shown). There is.

The X-ray fluoroscopic imaging stand having such a structure has the following functions. 1. By rotating the top plate support arm 3 around the X axis, the top plate 4 is tilted, and X-ray fluoroscopic imaging can be performed in a posture in which the subject is tilted. 2. By moving the top plate support arm 3 up and down along the Y-axis direction, it is possible to avoid contact between the top plate support arm 3 and the floor surface when the top plate 4 is tilted. 3. When the moving member 10 moves in the Z-axis direction, the C-shaped arm 8 slides in the body axis direction of the subject, and enables X-ray fluoroscopic imaging of each part of the body without changing the posture of the subject. . 4. C-shaped arm 8 around the Z-axis center, and C-shaped arm 8
By rotating the arm holder 9 supporting the X-axis about the X-axis center, X-ray fluoroscopic imaging from multiple directions becomes possible.

5. Furthermore, it is possible to deal with the contrast examination of laryngeal cancer, which has been increasing in recent years. As shown in simplified FIG. 8, the contrast examination of the laryngeal cancer is performed by placing the subject M on a step 11 of the subject 4 with the top 4 in a vertical posture, and in the front and lateral directions of the subject M. From the X of the throat
Take a line shot. FIG. 8 (A) shows a state of photographing from the front direction, and FIG. 8 (B) shows a state of photographing from the lateral direction.
For a patient with laryngeal cancer, it is difficult to maintain a posture in which the back is brought into close contact with the top plate 4 when sitting on the platform 11 of the top plate 4, and as shown in the figure, the posture is slightly bent forward. .

When performing X-ray imaging of the throat region of the subject M in such a posture from the front and side directions, the above-mentioned rotation of the top support arm 3 about the X axis (top 4). In a vertical posture), and in addition to the rotation of the C-shaped arm 8 around the Z-axis center,
A function to move the top plate 4 up and down is required. That is, as shown in FIG. 8B, the throat region of the subject M holding the forward leaning posture and the center of the imaging field of view (on the center line connecting the X-ray tube 7 and the X-ray image intensifier 6). This is because it is necessary to move the top plate 4 in the direction of the arrow by the distance D when aligning with the above), and this movement corresponds to the vertical movement of the top plate 4 in the horizontal posture.

<Second Conventional Example> FIG. 9 shows an X-ray fluoroscopic imaging stand of a second conventional example. 9A is a side view and FIG. 9B is a front view. A main body frame 13 is attached to a base 12 erected on the floor so as to be rotatable around the X-axis center and vertically movable along the Y-axis direction. Further, an arm holder 14 is attached to the main body frame 13 so as to be rotatable around the X-axis center and horizontally movable in the Z-axis direction. The arm holder 14 rotatably supports the C-shaped arm 17 that opposes and supports the X-ray tube 15 and the X-ray image intensifier 16 about the Z-axis center. The configuration up to this point is the first. This is similar to the conventional example.

The difference from the first conventional example is that the main body frame 13
In contrast, the top plate 18 is supported in a cantilevered state,
In this state, the top plate 18 moves up and down in the Y-axis direction based on the body frame 13.

[0009]

The above-mentioned conventional X-ray fluoroscopic imaging tables have the following drawbacks, respectively. (1) Since the first conventional example does not have a structure for supporting the top plate 4 in a cantilever state, the inspector cannot enter between the top plate 4 and the top plate support arm 3, and At this time, there is a difficulty in operability when a treatment (for example, a treatment such as inserting a catheter into a blood vessel) is performed on the subject. Since the top plate 4 is moved up and down by bending the top plate support arm 3 protruding in the X-axis direction in the middle, when the top plate 4 is supported in a cantilevered state, it is considerably bent. Since it is difficult to ensure the mechanical strength to withstand this load, the top plate 4 is conventionally supported in a double-supported state.

(2) The second conventional example is a main body frame
The stroke amount of the vertical movement of the top plate 18 is limited by the distance in the Y-axis direction of 13, and the stroke amount required for the positioning when performing the lateral X-ray imaging of the laryngeal cancer site described above is sufficiently secured. There is a drawback that you cannot do it. By increasing the distance in the Y-axis direction of the main body frame 13 in order to increase the stroke amount, the main body frame 13 is provided in order to avoid contact between the main body frame 13 and the floor when the top plate 18 is in the vertical posture.
The stroke amount of the vertical movement of 13 in the Y-axis direction must be increased accordingly, which leads to an increase in the size of the X-ray fluoroscopic imaging table. Therefore, the stroke amount of the vertical movement of the body frame 13 in the Y-axis direction is also limited by the height of the examination room in which the X-ray fluoroscopic imaging table is installed.

(3) In both the first and second conventional examples, a vertical movement mechanism for avoiding contact between the floor surface and the top plate supporting arm 3 or the main body frame 13 when the top plate 4 is tilted. ,
Since the vertical movement mechanism of the top board 4 for performing lateral X-ray imaging of the laryngeal cancer site is provided independently of each other, X
There are drawbacks that the mechanism of the fluoroscopic imaging stand becomes complicated and the manufacturing cost is high.

The present invention has been made in view of the above circumstances, and has a structure in which a top plate on which a subject is mounted is supported in a cantilever manner, and the stroke amount of vertical movement of the top plate is relatively large. It is an object of the present invention to provide an X-ray fluoroscopic imaging table that can be ensured and that a single mechanism can prevent vertical movement of the top plate and contact between the structure of the X-ray fluoroscopic imaging table and the floor surface.

[0013]

The present invention has the following constitution in order to achieve the above object. That is, according to the present invention, an imaging device support portion that supports the X-ray tube and the X-ray detection unit so as to be rotatable around the body axis of the subject and in the body axis direction is provided. In an X-ray fluoroscopic imaging stand that includes a main body frame that supports a top plate for mounting a subject while being movably supported along a direction, the bottom of the main body frame is formed in an arc shape and rotated on the base. A top plate support portion that is movably attached and cantilever supports the top plate for mounting the subject is attached to the main body frame so as to be movable at least in the vertical direction.

[0014]

The operation of the present invention will be described. Since the body frame rotates on the base with the arcuate peripheral surface of the bottom part,
The area of the vertical surface (front surface) of the main body frame is equivalent to the rotation range and is wider than that of the conventional example, and the amount of movement of the top plate supporting portion that moves in the vertical direction with respect to the main body frame is increased. We can secure a relatively large number. In order to explain this in comparison with the conventional X-ray fluoroscopic imaging table, the front view of FIG. 6 is referred to. In the figure, reference numeral 80 is a main body frame, 81 is a top plate, and 82 is a top plate supporting portion for movably supporting the top plate in the vertical direction. In FIG. 6 (a), the solid line portion shows each of the above-mentioned components of the X-ray fluoroscopic imaging stand according to the second conventional example, and the alternate long and short dash line shows each component of the X-ray fluoroscopic imaging stand of the present invention.

First, the position and the vertical distance of the main body frame 80 are set, for example, as shown in the drawing so that the main body frame 80 and the floor surface do not contact with each other in the X-ray fluoroscopic imaging stand of the second conventional example. The amount of vertical movement of the top plate support portion 82 at this time is limited to the range indicated by the symbol A. Similarly, if the bottom surface of the main body frame 80 is formed in an arc shape under the condition that the main body frame 80 and the floor surface are prevented from contacting each other, as shown by the one-dot chain line in FIG. The area of the front wall is increased, and the amount of vertical movement of the top plate support portion 82 is increased by the range indicated by the symbol B.

When the vertical distance of the main body frame 80 is increased in order to secure the same amount of movement (A + B = C) with the conventional X-ray fluoroscopic imaging stand, as shown in FIG. 6B. When the body frame 80 turns, the body frame
80 contacts the floor. In order to avoid contact, the main body frame 80 may be raised along the vertical direction,
As a result, the size of the X-ray fluoroscopic imaging table is increased by the amount that allows the ascending stroke of the body frame 80, and the amount of ascending stroke of the body frame 80 is limited by the height of the examination room accommodating the X-ray fluoroscopic imaging table. Will end up. That is,
According to the configuration of the present invention, the amount of vertical movement of the top plate supporting portion 82 is increased without increasing the size of the X-ray fluoroscopic imaging table and avoiding contact between the main body frame 80 and the floor surface. Can be secured.

Further, as shown in FIG. 6A, when the bottom portion of the body frame 80 is formed in an arc shape, the body frame 80
The main body frame 80 does not come into contact with the floor surface during rotation of the. Top plate support is for structures that may be in contact with the floor.
Although it becomes 82 (the possibility of contact is high when the position of the top plate support part 82 is at the lowest position), it can move up and down freely, so avoiding contact with the floor surface by moving it up be able to. As described above, the operation for avoiding the contact between the structure of the X-ray fluoroscopic imaging apparatus and the floor surface when the main body frame 80 is rotated, and the alignment during the lateral X-ray imaging of the aforementioned laryngeal cancer site. The vertical movement of the top plate 81 for performing the above can be performed by a single mechanism (only the vertical movement mechanism of the top plate support portion 82).

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of an X-ray fluoroscopic imaging table.
A body frame (21) having an arcuate bottom is rotatably mounted on a base (20) erected on the floor. The main body frame 21 has a substantially semi-circular ring plate bridged in the upper part thereof, and the video equipment support 23 is attached to the bridge part (this is referred to as a beam part and is indicated by reference numeral 22) at the Z part.
It is attached so that it can reciprocate along the axial direction.

The video equipment support 23 supports an arm holder 24 rotatably around the X axis, and a C-shaped arm 25 is rotatably held by the arm holder 24 around the Z axis. . An X-ray tube 26 for X-ray irradiation is provided at both ends of the C-shaped arm 25.
And an X-ray image intensifier 27 that converts the transmitted X-rays into an optical image and outputs the image, are attached in a state of facing each other.

A top plate 28 for placing a subject (not shown) on the front wall of the main body frame 21 is supported in a cantilever state by a top plate support portion 29, and the top plate support portion 29 is in the Y-axis direction. Is configured to be vertically movable along the X-axis direction and to be horizontally movable along the X-axis direction (since the subject's left-right direction is the X-axis direction when the subject lies on the top 28, this direction The movement of the left and right is called).

The configuration of each of the above parts will be further described.
FIG. 2 is a partially cutaway side view of the X-ray fluoroscopic imaging table. A flange 25a is formed on the outer edge of the C-arm 25. A plurality of rollers 29 sandwiching the flange portion 25a are attached to the arm holder 24.
The C-shaped arm 25 is rotatably supported by the arm holder 24. A chain 30 is stretched on the outer peripheral surface of the C-shaped arm 25, and both ends of the chain 30 are fixed to the C-shaped arm 25, and a part of the chain 30 is connected to the electric motor 32 via a sprocket 31 mounted in the arm holder 24. It is hung on the sprocket 33 fixed to the output shaft of. The forward / reverse operation of the electric motor 32 causes the C-arm 25 to roll.
Guided by 29, the arm holder 24 is rotated about the Z-axis center around the base portion.

A columnar member 34 penetrating the video equipment support portion 23 is integrally attached to the rear portion of the arm holder 24. The body of the columnar member 34 is rotatably supported in the video equipment support 23 by a bearing 35, and a gear 51 is integrally attached to the end protruding outside the video equipment support 23. The gear 51 meshes with the output gear of the electric motor 52 built in the video equipment support 23.
By the forward / reverse operation of the electric motor 52, the arm holder 24 becomes X.
Rotate around the axis.

FIG. 3 is a partially cutaway front view of the X-ray fluoroscopic imaging table. It should be noted that illustration of the video equipment and the like is omitted in this figure. A “U” -shaped groove 37 is circumferentially formed on the outer edge of the front surface of the main body frame 21, and a plurality of rollers 38 rolling in the groove 37 are attached to the base 20. This groove
37 is also formed on the rear surface of the main body frame 21, and similarly, a roller 38 that rolls in the groove 37 is attached inside the base 20. Two chains 39 are stretched in parallel on the outer peripheral surface of the main body frame 21. These chains 39
Both ends of are fixed to the body frame 21, part of which is the base
A sprocket 40 mounted inside 20 is bridged over a sprocket 42 integrated with an output shaft of an electric motor 41. The forward / reverse operation of the electric motor 41 causes the body frame 21 to rotate about the X axis.

A guide rail 43 extending in the Z-axis direction is laid on the beam portion 22 bridging the upper portion of the main body frame 21 formed in an arc shape. The video equipment support 23 is supported on a movable member 44 which is slidable on the guide rail 43. Two sprockets 45, 46 are arranged in parallel along the Z-axis direction on the surface of the video equipment supporting portion 23 facing the rear surface of the beam portion 22. The sprocket 45 is rotatably supported by the video equipment support 23, and the sprocket 46 is attached to the output shaft of an electric motor 47 built in the video equipment support 23.

Two sprockets 48, 49 are also rotatably supported on the rear surface of the beam portion 22 facing the image device supporting portion 23. These four sprockets 45, 46, 48, 49 are provided on the beam portion.
They are connected to each other by a chain 50 fixed to the rear surface of 22. When the electric motor 47 built in the video equipment support 23 is operated in the forward and reverse directions, the sprockets 45, 46, 48, 49 connected by the chain 50 rotate together to support the video equipment support 23. The moving member 44 thus slid on the guide rail 43 and self-propels along the Z-axis direction.

FIG. 4 shows the structure of the top plate supporting portion 29. FIG.
4A is a plan view and FIG. 4B is a front view. A pillar 60 extending in the Y-axis direction on the front wall of the main body frame 21.
Is attached. Guide rails 61 extending in the Y-axis direction are installed on both side walls of the pillar 60, and Y is provided on the front wall.
A rack gear 62 extending in the axial direction is installed. An up-and-down moving frame 64 having a U-shape in plan view is provided so as to surround the column 60, in which a plurality of rollers 63 holding the guide rail 61 are pivotally supported.

An electric motor 65 is built in the vertical movement frame 64,
A pinion gear 66 attached to the output shaft of the electric motor 65 is meshed with the rack gear 62,
By the forward / reverse operation of 65, the vertical movement frame 64 reciprocates in the Y-axis direction (vertical direction) with the column 60 as the base. A fixed frame 67 projecting in the X-axis direction is integrally attached below the vertical movement frame 64. An electric motor 69 is supported on the inside of the fixed frame 67 via a fixture 68.
Three guide rails 70 extending in the X-axis direction are installed on the upper wall and both side walls.

A left-right moving frame 73 having a plurality of rollers 71 for sandwiching these three guide rails 70 and a rack gear 72 extending in the X-axis direction inside is provided so as to surround the fixed frame 67. ing. The rack gear 72 of the left-right moving frame 73 and the pinion gear 74 of the electric motor 69 supported by the fixed frame 67.
The left and right moving frames 73 reciprocate in the X-axis direction (horizontal direction) with the fixed frame 67 as a base portion by the forward and reverse operation of the electric motor 69. A top plate 28 on which a subject (not shown) is placed is integrally attached to the left and right moving frame 73.

The X-ray fluoroscopic imaging stand having the above construction has the following functions. 1. As shown in FIG. 5, the semicircular main body frame 21 rotates on the base 20 at its peripheral surface to tilt the top plate 28 up and down. At this time, the main body frame 21 itself does not come into contact with the floor surface, but if the vertical movement frame 64 attached to the front wall of the main body frame 21 is at the lowest position, for example, the top plate is turned during the turning process. The left-right moving frame 73 supporting the 28 may come into contact with the floor surface. In FIG. 5, the state is shown by the solid line part. In that case, for example, the vertical movement frame 64 is raised to the position indicated by the imaginary line. If the main body frame 21 continues to rotate in that state, the left-right moving frame 73 rotates while drawing the locus indicated by the symbol E, and contact with the floor surface is avoided.

2. When the top plate 28 is brought into a vertical posture by the rotation, as shown in FIG. 8, the subject can be seated on the step of the top plate 28 and a contrast examination for laryngeal cancer can be performed. As described above, most of the subjects try to maintain the forward leaning posture in the contrast examination for laryngeal cancer. Therefore, when performing X-ray photography from the lateral direction shown in FIG. There is a gap between the center of the X-ray field of view and
(In (b), it is indicated by the symbol D), but in order to correct this, it is necessary to move the top plate 28 up and down. This is due to the movement of the vertical moving frame 64, and therefore, the mechanism for avoiding the contact between the horizontal moving frame 73 and the floor surface and the mechanism for performing the imaging alignment of the laryngeal cancer site are integrated. Mechanism (up / down motion frame)
64 moving mechanisms).

3. As described in <Operation> with reference to FIG. 6, in the main body frame 21 having an arcuate bottom, the area of the front wall is rectangular, such as the main body frame of the X-ray fluoroscopic imaging stand of the second conventional example. The movement stroke of the vertical movement frame 64 can be increased and the range of the imaging alignment of the laryngeal cancer site can be expanded.

Further, the conventional X-ray fluoroscopic imaging table has the following functions. 4. By moving the video equipment support 23 along the Z-axis direction (the body axis direction when the subject lies on the top 28) on the beam 22 of the main body frame 21, without moving the subject, It enables X-ray photography of each part of the body. 5. While rotating the C-shaped arm 25 around the Z axis,
By rotating the arm holder 24 supporting the C-shaped arm 25 around the X-axis center, X-ray imaging from multiple directions is possible. 6. By supporting the top plate 28 in a cantilever state, the operator can enter the space between the top plate 28 and the C-shaped arm 25, and the procedure required for the inspection can be easily performed.

[0033]

As is apparent from the above description, according to the X-ray fluoroscopic imaging stand of the present invention, at least the vertical direction is provided on the main body frame which rotates on the base with the peripheral surface of the arcuate bottom. Since the top plate supporting portion is supported by a cantilever, the following effects can be obtained. (1) The area of the front wall of the main body frame is larger than that of the conventional one, and a large amount of vertical stroke of the top plate supporting portion can be secured. Therefore, the imaging position of the laryngeal cancer site can be adjusted over a wide range, and the subject can easily get on and off the tabletop. (2) By moving the top support part along the vertical direction, it is possible to avoid contact between the top support part and the floor surface when the main body frame is rotated. Therefore, the vertically moving mechanism of the main body frame, which has been conventionally installed, is not required, and the manufacturing cost of the X-ray fluoroscopic imaging stand can be reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view of an X-ray fluoroscopic imaging table according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view of an X-ray fluoroscopic imaging table.

FIG. 3 is a partially cutaway front view of an X-ray fluoroscopic imaging stand.

4A and 4B are a plan view and a front view of a top plate supporting portion of an X-ray fluoroscopic imaging stand.

FIG. 5 is a front view showing one operation of the X-ray fluoroscopic imaging table.

FIG. 6 is a partial front view of the X-ray fluoroscopic imaging table for explaining the operation of the present invention.

7A and 7B are a plan view and a front view of an X-ray fluoroscopic imaging table according to a first conventional example.

8A and 8B are a front view and a plan view showing contrast imaging of laryngeal cancer in a conventional example.

FIG. 9 is a side view and a front view of an X-ray fluoroscopic imaging stand according to a second conventional example.

[Explanation of symbols]

 20 ... Base 21 ... Main frame 23 ... Video equipment support 26 ... X-ray tube 27 ... X-ray image intensifier 28 ... Top 29 ... Top support Department

Claims (1)

(57) [Claims] 1. A video equipment supporting portion for rotatably supporting the X-ray tube and the X-ray detecting means so as to be rotatable around the body axis of the subject and in the body axis direction of the subject. In an X-ray fluoroscopic imaging stand having a main body frame that supports a top plate for mounting a subject while being movably supported along the main body frame, the bottom portion of the main body frame is formed into an arc shape and rotated on the base. An X-ray fluoroscopic imaging table, wherein a top plate support portion that is freely attached and cantilever supports the top plate for mounting the subject is attached to the main body frame at least vertically.