JP2008245726A - Manual retainer for overhead travelling suspension x-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manual retainer for an overhead travelling suspension X-ray tube, which prevents the displacement when regulating the movement of an X-ray tube and generating no unpleasant sound. <P>SOLUTION: A regulation area setting section 69 sets a prescribed-range regulation area A<SB>1</SB>including a stop position A<SB>2</SB>of the X-ray tube 12, and a regulation force adjusting mechanism 81 starts the regulating operation of the movement of the X-ray tube 12 within the set regulation area A<SB>1</SB>at a height H other than the stop position A<SB>2</SB>, and variably adjusts the regulation force within the regulation area A<SB>1</SB>. The regulating operation of the movement of the X-ray tube 12 is started within the set regulation area A<SB>1</SB>at the height H other than the stop position A<SB>2</SB>and the regulation force is variably adjusted within the regulation area A<SB>1</SB>so as to stop the X-ray tube 12 at the stop position A<SB>2</SB>without any displacement due to inertia. The regulation force is variably adjusted within the regulation area A<SB>1</SB>and gradually applied thereto so as to scarcely generate the frictional sound and prevent the unpleasant sound. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manual overhead traveling suspended X-ray tube holding device that includes a holding mechanism that holds an X-ray tube vertically movable with respect to a visualization means and suspends and holds the X-ray tube so as to be movable along a ceiling surface. .

  Conventionally, as this type of device, a manual type equipped with a holding mechanism that holds the X-ray tube vertically movable with respect to the image intensifier and that can be moved two-dimensionally along the ceiling surface. There is an overhead traveling suspended X-ray tube holding device (see, for example, Patent Document 1). In this apparatus, since the distance in the height direction in which fluoroscopic imaging can be performed is determined, the height of the X-ray tube is positioned at a predetermined height regardless of whether or not the fluoroscopic imaging is possible. If it is, the regulating mechanism is automatically activated.

  Specifically, when the X-ray tube is located within a predetermined height, the brake is activated and automatically locked. Therefore, when the photographer adjusts the height of the X-ray tube, the lock is temporarily released by operating a switch or the like, and then the X-ray tube is moved up and down to adjust the height to a desired height and then locked again. It is designed to operate.

  In addition, regarding these automatic functions, it is often the case that the operability is improved by distinguishing from the operations for simple shooting. For example, when the X-ray tube tube is opposed to the image intensifier and the procedure is set so that the patient is clearly seen, or only when the situation is complete, such as automatic vertical movement lock There is also means for enabling the function (for example, see Patent Document 2).

In other words, when the tube of the X-ray tube moves at a fluoroscopic position, it is automatically locked at the desired fluoroscopic distance (SID: Source Image Distance) by moving up and down in the vertical direction. . In the lock mechanism, the tooth brake or electromagnetic brake is brought into contact with a vertical shaft or a pulley on which a wire is suspended to apply or lock the brake.
JP-A-8-112272 JP 2006-75265 A

However, the conventional example having such a configuration has the following problems.
In other words, the conventional apparatus is locked only when the photographer reaches the fluoroscopic distance when the apparatus is operated (that is, moves to the stop position). Then, when it is stationary (ie, overrun), there is a problem in that the photographer feels uncomfortable because a frictional sound is generated while the position is shifted from the correct position or the position is shifted on the lock surface, and a high-pitched sound is generated.

  The present invention has been made in view of the above circumstances, and is a manual overhead traveling suspended X-ray tube that does not cause an unpleasant sound without causing a positional shift when the movement of the X-ray tube is restricted. An object is to provide a holding device.

In order to achieve such an object, the present invention has the following configuration.
That is, according to the first aspect of the present invention, the X-ray tube can be vertically moved with respect to the visualization means for visualizing transmitted X-rays, and the X-ray irradiation direction can be adjusted in multiple directions. A manual ceiling traveling suspended X-ray tube holding device having a holding mechanism that suspends and movably moves along the ceiling surface, and a restriction mechanism that restricts movement of the X-ray tube, and stops the X-ray tube A restriction area setting means for setting a restriction area including a position within a predetermined range; and a restriction operation for starting movement of the X-ray tube within the set restriction area and at a position other than the stop position; and restriction within the restriction area And a regulating force adjusting mechanism that variably adjusts the force.

  [Operation / Effect] According to the invention described in claim 1, the restriction area setting means sets a predetermined range of restriction area including the stop position of the X-ray tube, and the restriction force adjusting mechanism sets the set restriction. The restriction operation of the movement of the X-ray tube is started within the area and other than the stop position, and the restriction force is variably adjusted within the restriction area. By starting the restriction operation of the movement of the X-ray tube within the set restriction area and other than the stop position, and adjusting the restriction force variably within the restriction area, there is no position shift due to inertia, The X-ray tube can be stopped at the stop position. Further, since the regulation is gradually applied by variably adjusting the regulation force within the regulation area, a friction sound is hardly generated and an unpleasant sound is not generated. As a result, when the movement of the X-ray tube is restricted, no displacement occurs and no unpleasant sound is generated.

  The restricting mechanism may restrict the movement of the X-ray tube in the horizontal direction (invention according to claim 2), or may restrict the movement of the X-ray tube in the vertical direction (in claim 3). Described invention). In the case where the movement of the X-ray tube in the vertical direction is restricted, a modified implementation as described in Patent Document 2 can be considered.

  That is, the regulation mechanism may be operated in a condition where the X-ray tube and the visualization means are opposed to each other (the invention according to claim 4). Since the restriction mechanism operates in a condition where the X-ray tube and the visualization means are opposed to each other, the restriction mechanism can be moved up and down freely in other states. Therefore, the photographer does not need to be aware of the position of the X-ray tube and can easily operate it.

  In this invention, in addition to the above conditions, it is preferable that the restriction mechanism operates when the X-ray tube is within a predetermined height range from the visualization means (the invention according to claim 5). Since the restriction operation is performed when the height of the X-ray tube from the visualization means is within a predetermined height range, the restriction operation is not performed at a height exceeding the height. Therefore, the photographer can freely move up and down without being aware of the height position.

  In addition, in this invention, in addition to the above conditions, the regulating mechanism preferably operates when the irradiation direction of the X-ray tube is directed to the visualization means (the invention according to claim 6). Since the restricting operation is performed when the irradiation direction of the X-ray tube is directed to the visualization means, the X-ray tube can be freely moved up and down without being aware of the position in a state where fluoroscopic imaging is not possible.

  In the present invention, it is preferable to include stop position / restriction area adjustment means for variably adjusting at least one of the stop position and the range of the restriction area (the invention according to claim 7). By providing stop position / restriction area adjustment means for variably adjusting at least one of the stop position and the range of the restriction area, it is possible to realize shooting corresponding to various restrictions.

  In the present invention, it is preferable that a physical quantity varying means for variably adjusting a physical quantity for variably adjusting the regulation force in the regulation area is provided (the invention according to claim 8). By providing a physical quantity varying means that variably adjusts the physical quantity that variably adjusts the regulation force within the regulation area, it is possible to realize shooting corresponding to various regulations.

  According to the manual overhead traveling suspended X-ray tube holding device according to the present invention, the restriction area setting means sets the restriction area within a predetermined range including the stop position of the X-ray tube, and the restriction force adjustment mechanism is set. The movement of the X-ray tube is controlled within the restricted area and at a position other than the stop position, and the regulating force is variably adjusted within the restricted area. Don't make an unpleasant sound.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a schematic configuration of a manual overhead traveling suspended X-ray tube holding device according to an embodiment.

  The subject M to be imaged is placed on the bed 1 installed on the floor. The bed 1 includes a top plate 3 made of an X-ray transmitting material and a base 5 that supports the top plate 3. An image intensifier 7 for visualizing a transmitted X-ray image is embedded in the base 5. The imaging surface 7a is directed to a portion corresponding to the bottom surface of the top plate. A horizontally movable cassette 9 is disposed below the top plate 3. The cassette 9 is configured to be movable between a standby position indicated by a solid line in FIG. 1 and a photographing position indicated by a two-dot chain line in FIG. 1 above the image intensifier 7.

  The image intensifier corresponds to the visualization means of this invention.

A horizontal movement mechanism 11 is disposed on the ceiling surface.
The horizontal movement mechanism 11 is provided with an upper end of a suspension holding mechanism 13 that holds the X-ray tube 12 up and down in the vertical direction. An X-ray tube 12 is attached to the lower end of the suspension holding mechanism 13. The suspension holding mechanism 13 holds the X-ray tube 12 so as to be movable up and down, and can be moved in the horizontal direction X and the paper surface direction Y of FIG. The X-ray tube 12 is moved in the Z direction by moving up and down, and the height H of the X-ray focal point 12a can be adjusted from the imaging surface 7a. Further, the X-ray tube 12 is rotatable around θ1 and θ2.

  Please refer to FIG. 2 and FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view in a direction orthogonal to FIG.

  The horizontal movement mechanism 11 includes a fixed rail 15 fixed to the ceiling, and a section 17 that indicates an imaging center CX in the X direction of X-ray imaging is fixed thereto with a screw. A micro switch 21 indicating an imaging center CX in the X direction of X-ray imaging is attached to the moving rail 19 via an L-shaped support member 23. The microswitch 21 is adjusted to a position where the detection piece comes into contact with the section 17. In addition, a section 25 indicating the imaging center CY in the Y direction of X-ray imaging is attached to the moving rail 19 with a screw. A micro switch 29 indicating an imaging center CY in the Y direction of X-ray imaging is attached to the suspension portion 27 via an L-shaped support member 31. The microswitch 29 is adjusted to a position where the detection piece comes into contact with the slice 25.

  A roller 34 supported by the moving rail support member 33 is attached to the U-shaped guide surface of the fixed rail 15. Therefore, the moving rail 19 is supported so as to be movable in the X direction together with the suspension portion 27. In addition, a roller 37 disposed on a suspension portion support member 35 erected on the suspension portion 27 is provided on the U-shaped guide surface of the moving rail 19 disposed so as to be orthogonal to the fixed rail 15. Has been placed. Therefore, the suspension part 27 is supported so as to be movable in the Y direction together with the X-ray tube 12.

  Reference is now made to FIG. FIG. 4 is a diagram showing the configuration of the braking mechanism. Note that the X-direction and Y-direction braking mechanisms have the same configuration, and therefore the X-direction braking mechanism will be described as an example.

  The X-direction braking mechanism 39 is provided in the moving rail support member 33. Specifically, one end side of a lever 45 that is swung around a rocking fulcrum 43 is connected to the tip of a rod 41 that expands and contracts in response to the on / off operation of the solenoid SOL1. A braking shaft 49 having a braking member 47 having a large friction coefficient such as rubber attached to the tip is attached. Further, the tip end portion of the rod 41 is urged in the extending direction by the tension coil spring 51.

  When the solenoid SOL1 is turned on, the rod 41 contracts, the lever 45 is swung, and the braking shaft 49 is moved to the opposite side of the fixed rail 15, so that the braking member 47 pressed against the fixed rail 15 is Move away from the fixed rail 15. That is, the braking by the braking member 47 is released. When the solenoid SOL1 is turned off, the rod 41 is pulled by the tension coil spring 51, the lever 45 is swung, and the brake shaft 49 is pushed out to the fixed rail 15 side, whereby the brake member 49 is pressed against the fixed rail 15. Braking.

  Please refer to FIG. FIG. 5 shows the internal structure of the suspension part.

  One end side is supported by the rope support member 53, wound around the pulley 58 via the pulleys 54 to 57, hung on the hook 59 at the tip end portion of the suspension portion 27, wound around the pulley 60, and connected to the pulleys 61 to 64. The suspension part 27 is suspended and supported by a rope 66 whose other end is supported by the rope support member 65. When the suspension part 27 is expanded or contracted, that is, when the X-ray tube 12 is moved up and down in the Z direction, the pulleys 56, 58, 60, and 62 rotate, and the pulleys 55, 57, 61, and 63 move back and forth (a and b directions in the figure). Move to). At this time, the pulleys 55, 57, 61, 63 are urged in the direction a by a spring member (not shown). This spring member is designed to urge the pulleys 55, 57, 61, 63 in the a direction in proportion to the gravity regardless of the height of the X-ray tube 12 supported by the suspension portion 27 at the lower end. ing. A drum 67 that rotates in conjunction with the pulleys 56, 58, 60, and 62 is disposed.

  In the above configuration, when the solenoid SOL3 is turned on, the contact between the brake member 68 and the drum 67 is released, the pulleys 56, 58, 60, 62 can be rotated, and the telescopic brake of the suspension part 27 is released. It will be. Further, when the solenoid SOL3 is turned off, the brake member 68 is pressed against the drum 67, so that the rotation of the pulleys 56, 58, 60, 62 is suppressed and the brake is applied.

  Please refer to FIG. 6A and 6B are diagrams showing a circuit configuration of the braking mechanism. It should be noted that the portions related to the rotation operations of θ1 and θ2 of the X-ray tube 12 are omitted.

  Switches SW1 to SW4 that can be operated by the radiographer are disposed in an operation unit (not shown) provided near the X-ray tube 12. These switches SW1 to SW5 are momentary switches that are kept on only while being pressed. The switch SW1 is connected in series with the relay R1, and releases the movement in the X direction. The switch SW2 is connected in series with the relay R2, and releases the movement in the Y direction. The switch SW3 is connected in series with the relay R3, and is operated simultaneously with the switch SW1 (SW2) in order to release the lock that is activated after moving in the X and Y directions. The above-described microswitches 21 and 29 are connected in series with normally-on relays R4 and R5, and when the microswitches 21 and 29 are turned on, the relays R4 and R5 are turned off. Yes. The switch SW4 and the switch SW5 connected in parallel to the switch SW4 are connected in series with the relay R6, and release the movement in the Z direction.

Note that the switch SW5 is different from the switches SW1 to SW4 described above and cannot be arbitrarily operated by the photographer. The switch SW5 is in the restriction area A ₁ that is set by the restriction area setting unit 69 as described later, and restricting-force adjustment mechanism 81 to move the X-ray tube 12 except the stop position A ₂ of the X-ray tube 12 initiated by, it is operated by the regulating mechanism 73 while variably adjusted by restricting-force adjustment mechanism 81 the regulating force in the restriction area a _1.

  The X-ray tube 12 is moved in the X and Y directions while pressing down the switches SW1 and SW2 of the operation unit (not shown). If the microswitches 21 and 29 are turned on at that time, Relays R4 and R5 are turned off. Then, even if the switches SW1 and SW2 are pressed, the relays R4 and R5 connected in series to the relays R1 and R2 are turned off, so that the solenoids SOL1 and SOL2 are turned off. Therefore, even if the X-ray tube 12 is moved in a state in which braking is released, the movement is automatically stopped and positioned at a position that coincides with CX and CY at the imaging center.

  A potentiometer 85 (see FIG. 7) that outputs a signal in accordance with each movement is attached to the horizontal movement mechanism 11 and the suspension holding mechanism 13 configured as described above, and the signal is sent to the restriction area setting unit 69. Given. The restriction area setting unit 69 gives positional information of X, Y, Z, H, θ1, and θ2 to the control unit 71, the restriction force adjustment mechanism 81, and the restriction mechanism 73. The control unit 71 controls the high voltage device 75 and the image intensifier 7 for applying a high voltage to the X-ray tube 12, collects signals related to the transmission X-rays from the image intensifier 7, and transmits the transmission X It outputs to the monitor 77 as a line image. An instruction to apply a high voltage to the X-ray tube 12 is given by, for example, a foot switch 79 operated by a photographer with his / her foot. A regulating force adjusting mechanism 81 is connected between the regulating area setting unit 69 and the regulating mechanism 73.

  Please refer to FIG. FIG. 7 is a block diagram for explaining the restriction area. In FIG. 7, the gear 83 is illustrated in a straight line for convenience of illustration, but it should be noted that it is actually an arc shape. A suspension portion 27 (see FIGS. 1 to 3 and 5) is suspended and supported by a rope 66 (see FIG. 5), and a pulley 63 (see FIG. 5) supporting the rope 66 has a gear. 83 is arranged. The gear 83 is provided with a potentiometer 85. The potentiometer 85 is adjusted to a position where the detection piece comes into contact with the sections 87 and 89.

Each of the segments 87 and 89 is provided so that the distance between the segments 87 and 89 corresponds to the distance of the regulation area A ₁ (see FIG. 1) in the Z direction. The section 87 is provided so that the X-ray tube 12 has a height H when the detection piece of the potentiometer 85 that rotates together with the gear 83 by the rotation of the pulley 63 contacts the section 87. Further, when the detection piece of the potentiometer 85 comes into contact with the slice 87 (that is, when the X-ray tube 12 reaches the height H), the restriction operation by the restriction mechanism 73 is released and the movement of the X-ray tube 12 is restricted. Start operation.

Further, the stop position A ₂ (see FIG. 1) of the X-ray tube 12 is set when the detection piece of the potentiometer 85 comes into contact with the slice 89. Further, the position information from the potentiometer 85 is given to the restriction area setting unit 69, and the restriction area setting part 69 gives the position information to the restriction force adjusting mechanism 81. Then, based on the position detection sections 87 and 89 by the potentiometer 85, restriction area setting unit 69 sets the restriction area A ₁ of a predetermined range including the stop position A ₂ of the X-ray tube 12, restricting-force adjustment mechanism 81, in the restriction area a ₁ that is set and started to regulate operation of the movement of the X-ray tube 12 except the stop position a _2, variably adjusts the restricting force in the restriction area a within _1.

Please refer to FIG. FIG. 8 is a timing chart of an input waveform for explaining the regulation force adjustment. When starting the regulating operation of the movement of the X-ray tube 12, PWM in order to variably adjust the restricting force in the restriction area A _1, relative to the restricting-force adjustment mechanism 81 is a solenoid SOL3 (refer to FIG. 5, FIG. 6) Perform (Power Width Modulation) control. That is, the regulating force adjusting mechanism 81 operates the switch SW5 via the regulating mechanism 73 so that the input waveform for turning the solenoid SOL3 on and off repeatedly turns on and off.

In this specification, the switch SW5 is turned off when the input waveform is off, the relay R6 is turned off and the solenoid SOL3 is turned off to apply the regulation, and the switch SW5 is turned on when the input waveform is on, and the relay R6 is turned on. The regulation is temporarily released by turning on the solenoid SOL3. Further, in this specification, the time ratio of the time T ₂ of the time-off for the period T ₁ of the input waveform on and off is defined as "Duty ratio". When the time period _{T 1} is a several msec performs PMW control with a small value Duty ratio relatively (for example, about 10-20%), the braking force of the locking mechanism (restricting force) although insufficient, Z direction (vertical Since a slight burden is imposed on the operation of (direction), it is possible to give the photographer an impression that the operational feeling becomes heavy. This duty ratio corresponds to a physical quantity that variably adjusts the regulation force within the regulation area in the present invention.

Returning to the description of FIG. 6, the restricting mechanism 73 restricts the raising / lowering operation of the X-ray tube 12.
Specifically, when the X-ray tube 12 is within the height H, when the input waveform is turned off by the regulating force adjusting mechanism 81, the switch SW5 is turned off, the relay R6 is turned off, and the solenoid SOL3 is turned off. Turn off. As a result, the brake member 68 is pressed against the drum 67 to be regulated. On the other hand, when the input waveform is on by the regulation force adjusting mechanism 81, the switch SW is turned on, the relay R6 is turned on, the solenoid SOL3 is turned on, and the regulation force is temporarily adjusted to “0”. As a result, the contact between the brake member 68 and the drum 67 is temporarily released for the ON time. Accordingly, the elevating operation cannot be performed unless the photographer presses the switch SW4 and manually releases the brake. However, the restriction operates because the X-ray tube 12 and the image intensifier 7 face each other as shown in FIG. 1, the X-ray tube 12 is within the height H, and the X-ray of the X-ray tube 12 This is only when the irradiation direction is directed toward the imaging surface 7 a of the image intensifier 7. In other states, since the switch SW5 is not turned off, the brake is released and the X-ray tube 12 can be arbitrarily raised and lowered. The height H may be various values depending on the X-ray tube 12 and the image intensifier 7 or the like, and is 1 m, for example.

  In the apparatus configured as described above, the photographer presses the switches SW1 and SW2 to move the X-ray tube 12 to a retreat position that does not get in the way when the subject M is placed on the bed 1. When the subject M is placed on the bed 1, the X-ray tube 12 is moved upward to the image intensifier 7, and when the alignment is automatically performed at the imaging center, the foot switch 79 is operated to perform fluoroscopy. Take a picture. When the photographer observes the transmitted X-ray image displayed on the monitor 23 and determines that the region of interest is displayed, the X-ray irradiation is stopped once and the cassette 9 is moved to the imaging position. Take a picture.

  Next, the restriction by the restriction mechanism 73 will be described with reference to FIG. 9, and the restriction force adjustment by the restriction force adjustment mechanism 81 in the restriction operation will be described with reference to FIG. FIG. 9 is a flowchart showing the regulation operation, and FIG. 10 is a flowchart showing the regulation force adjustment operation.

Step S1
First, the restriction mechanism 73 determines whether or not the X-ray tube 12 and the image intensifier 7 are opposed to each other based on the position information. If it is determined that they are facing each other, the process proceeds to the next step S2.

Step S2
Next, the restriction mechanism 73 determines whether or not the X-ray tube 12 is within a predetermined height H. If it is determined that the height is within the predetermined height H, the process proceeds to the next step S3.

Step S3
Finally, the restriction mechanism 73 determines whether or not the irradiation direction of the X-ray tube 12 matches the image intensifier 7. If it is determined that they match, the process proceeds to step S4, where the regulation operation, that is, the PWM control is performed on the solenoid SOL3, the regulation force is adjusted, and the brake is applied. On the other hand, if it is determined that they do not coincide with each other, the process proceeds to step S5 to release the regulation operation, that is, the solenoid SOL3 is turned on to release the brake. The process proceeds to step S5 also in the case of negative in steps S1 and S2 described above.

Step S41
In the restricting operation in step S4, the input waveform is turned off and the restriction is applied.

Step S42
Subsequently, the input waveform is turned on to temporarily release the restriction.

Step S43
X-ray tube 12 repeats steps S41, S42 until it reaches the stop position _{A 2.} In other words, the start of the regulation in height H, so that the X-ray tube 12 at the stop position A ₂ stops, found in advance Duty ratio, by performing repeat steps S41, S42 in the Duty ratio, step X-ray tube 12 can be controlled to stop when it reaches the stop position a ₂ in S43.

  Next, with reference to FIGS. 11 to 13, a state in which the restriction operation is released will be described. In addition, FIGS. 11-13 is a figure which shows the example in which regulation operation | movement is each cancelled | released.

  In FIG. 11, although the X-ray tube 12 is within the height H, the X-ray tube 12 is located at a position deviated laterally from above the image intensifier 7 and is not opposed. Accordingly, the result in Step S1 is negative, the process proceeds to Step S5, and the restriction operation is released.

  In FIG. 12, the X-ray tube 12 faces the image intensifier 7 but is at a position exceeding the height H. Therefore, although the process proceeds from step S1 to step S2, a negative action is made in step S2 and the restriction operation is released.

  In FIG. 13, the X-ray tube 12 is rotated in the θ1 direction, and the X-ray irradiation directions are inconsistent. Accordingly, the process proceeds to step S5 in step S3, and the restriction operation is released.

  FIG. 14 is an example of photographing using the stand photographing stand 91. Also in this case, the restriction operation is released. The restriction operation is also released when the X-ray tube 12 is moved to a parking position (for example, the right side of the bed 1) that does not interfere with imaging.

  As described above, in the positional relationship where it is determined that the image intensifier 7 or the cassette 9 is not photographed, the ascending / descending operation of the X-ray tube 12 is not restricted by the restriction mechanism 73. Therefore, the photographer does not need to be aware of the position of the X-ray tube 12 and can easily operate it.

According to the manual overhead traveling suspended X-ray tube holding device according to the present embodiment having the above-described configuration, the restriction area setting unit 69 includes a restriction area A within a predetermined range including the stop position A ₂ of the X-ray tube 12. ₁ set, restricting-force adjustment mechanism 81 starts restricting operation of the movement of the X-ray tube 12 within the restriction area a ₁ that is set, and other than the stop position a ₂ (i.e. height H), whereas its regulation variably adjusting the control force in the area a _1. In the set restriction area A within _1, and the start of the regulating operation of the movement of the X-ray tube 12 with a height H is other than stop position A _2, variably adjusts the restricting force in the restriction area A within ₁ it is, without positional deviation due to inertia occurs, it is possible to stop the X-ray tube 12 at the stop position a _2. Further, since the gradually over the regulation by variably adjusting the regulating force in the restriction area A _1, the frictional noise occurred hardly unpleasant sound does not occur. As a result, when the movement of the X-ray tube 12 is restricted, a positional shift is not generated, and an unpleasant sound is not generated.

  In this embodiment, the movement of the X-ray tube 12 in the vertical direction is mainly restricted, and the restriction mechanism 73 operates when the X-ray tube 12 and the image intensifier 7 face each other. I am doing so. Since the restriction mechanism 73 operates in a condition where the X-ray tube 12 and the image intensifier 7 are opposed to each other, the restriction mechanism 73 can be moved up and down freely in other states. Therefore, the photographer does not need to be aware of the position of the X-ray tube 12 and can easily operate it.

  In the present embodiment, the restriction mechanism 73 operates when the X-ray tube 12 is within a predetermined height H from the image intensifier 7 in addition to the above conditions. Since the restriction operation is performed when the height H of the X-ray tube 12 from the image intensifier 7 is within a predetermined height range, the restriction operation is not performed at a height exceeding that. Therefore, the photographer can freely move up and down without being aware of the height position.

  In the present embodiment, the restriction mechanism 73 operates when the irradiation direction of the X-ray tube 12 is directed toward the image intensifier 7 in addition to the above-described conditions. Since the restricting operation is performed when the irradiation direction of the X-ray tube 12 is directed toward the image intensifier 7, the X-ray tube 12 can be freely moved up and down without being aware of the position when fluoroscopic imaging is not possible. be able to.

  The present invention is not limited to the above-described embodiment, and can be modified as follows.

  (1) In the embodiment described above, the irradiation direction of the X-ray tube 12 is considered, but it is not always necessary to consider the irradiation direction. That is, it may be determined only by whether or not it is opposed to the height.

  (2) In the embodiment described above, the image intensifier 7 is exemplified as the visualization means, but a flat panel detector may be adopted instead.

(3) In the above-described embodiment, when the detection piece of the potentiometer 85 comes into contact with the section 87, the restriction operation by the restriction mechanism 73 is released, the movement restriction operation of the X-ray tube 12 is started, and the potentiometer 85 as when the detection piece is in contact with the sections 89 is the stop position a ₂ of the X-ray tube 12 is provided with the sections 87 and 89, respectively, may be provided only sections 87 serving as the base point of initiation.

(4) In the above-described embodiment, the movement of the X-ray tube 12 in the vertical direction is restricted. However, the movement of the X-ray tube 12 in the horizontal direction may be restricted, or in both the vertical direction and the horizontal direction. The movement of each may be restricted. For example, the section 17 (or section 25) described above with reference to FIGS. 2 and 3 is fixedly disposed at a position corresponding to the restriction start position, and the microswitch 21 (or microswitch 29 described above with reference to FIGS. 2 and 3) is disposed. ) Moves with the moving rail 19 (or the suspension part 27), and the detection pieces of the microswitches 21 and 29 come into contact with the sections 17 and 25 (that is, when the X-ray tube 12 reaches the restriction start position). Then, the positional information from the microswitch is given to the restriction area setting unit 69 described above with reference to FIG. Then, the restriction area setting unit 69 may provide the position information to the restriction force adjustment mechanism 81 described above with reference to FIG. In this way, restricting-force adjustment mechanism 81, when the X-ray tube 12 is moved in the horizontal direction, movement of the X-ray tube 12 within the restriction area A ₁ that is set, and other than the stop position A ₂ it can be of starts regulating operation, to variably adjust the restricting force in the restriction area a within _1.

  (5) In the above-described embodiment, the restriction area and the stop position are set based on the detection mechanism typified by a potentiometer or the like and the detection object typified by a slice, but an encoder may be used as the detection mechanism, A photo sensor may be used.

  (6) In the embodiment described above, the detection mechanism represented by a potentiometer or the like moves and the object to be represented by the section is fixed. However, the detection mechanism represented by the section is fixed by fixing the detection mechanism. You may move things.

  (7) In the above-described embodiment, the detection object represented by the section is fixed, and the restriction area setting unit 69 is based on the detection mechanism represented by the potentiometer and the like and the detection object represented by the section. Thus, although the restriction start position is detected and the restriction area is set, it is not necessary to fix the restriction area and the stop position including the restriction start position. The position information of the detection mechanism or the object to be detected is associated with the position information of the X-ray tube 12 in advance, and at least one of the stop position and the restriction area range is variably adjusted (for example, the stop position can be fixed). Only the restriction area range is variable, only the stop position is variable and the restriction area range is fixed, or both the stop position and the restriction area range are variable). Such a regulation may be shared by the regulation area setting unit 69, the regulation force adjustment mechanism 81, or the control unit 71. Further, such adjustment may be performed by a separately provided control unit. The restriction area setting unit 69 (or the regulation force adjustment mechanism 81 or the control unit 71) corresponds to the stop position / regulation area adjustment means in the present invention. By providing such a stop position / restriction area adjusting means, it is possible to realize shooting corresponding to various restrictions.

  (8) In the embodiment described above, the physical quantity (duty ratio in the embodiment) for variably adjusting the regulation force in the regulation area is fixed, but the physical quantity may be variably adjusted. As shown in FIG. 15, an input unit 93 (a pointing device such as a mouse or a keyboard, a switch or a button) is provided so that the photographer can perform such adjustment, and a physical quantity to be changed is input to the input unit 93 (for example, Duty). By changing the ratio), it is possible to realize shooting corresponding to various regulations. The input unit 93 corresponds to the physical quantity varying means in this invention.

  (9) In the above-described embodiment, the regulation force is variably adjusted by performing PWM control on the solenoid. However, the present invention is not limited to this. The regulation force may be variably adjusted by changing the current passed through the brake system such as a solenoid stepwise as shown in FIG. In this case, it is assumed that when the current value is small, the regulation force is small, and when the current value is large, the regulation force is large.

  (10) In the above-described embodiment, the regulation force is variably adjusted by performing PWM control on the solenoid. However, the regulation force may be changed stepwise as it approaches the stop position. In particular, it is possible to smoothly stop by changing the regulation force greatly stepwise as it approaches the stop position. When PWM control is performed on the solenoid as in the embodiment, the duty ratio may be increased stepwise as the stop position is approached, and the current flowing through the brake system as shown in FIG. When changing stepwise, the current value may be increased stepwise as the stop position is approached.

  (11) In the above-described embodiment, the brake member or the braking member is a type that performs braking by pressing, but the type is not limited as long as the braking is performed. For example, an electromagnetic brake may be employed.

It is a figure which shows schematic structure of the manual type overhead traveling suspension X-ray tube holding device which concerns on an Example. It is AA arrow sectional drawing of FIG. It is sectional drawing of the direction orthogonal to FIG. It is a figure which shows the structure of a braking mechanism. It is a figure which shows the internal structure of a suspension part. (A), (b) is a figure which shows the circuit structure of a braking mechanism. It is a block diagram with which it uses for description of a regulation area. It is a timing chart of an input waveform for explanation of regulation power adjustment. It is a flowchart which shows a control operation. It is a flowchart which shows the operation | movement of regulation force adjustment. It is a figure which shows Example 1 with which regulation operation | movement is cancelled | released. It is a figure which shows Example 2 with which regulation operation | movement is cancelled | released. It is a figure which shows Example 3 with which regulation operation | movement is cancelled | released. It is a figure which shows Example 4 from which regulation operation | movement is cancelled | released. It is a figure which shows schematic structure of FIG. 1 at the time of providing an input part. It is a timing chart of the current sent through the brake system used for explanation of regulation power adjustment concerning a modification.

Explanation of symbols

M ... subject 7 ... image intensifier 12 ... X-ray tube 69 ... restriction area setting unit 81 ... restriction force adjusting mechanism H ... height A ₁ ... restriction area A ₂ ... stop position

Claims (8)

  An X-ray tube is held vertically to a visualization means for visualizing transmitted X-rays, and the X-ray irradiation direction can be adjusted in multiple directions, and can be moved along the ceiling surface. A manual ceiling traveling suspended X-ray tube holding device having a holding mechanism for holding and a restricting mechanism for restricting movement of the X-ray tube, and sets a restricted area including a stop position of the X-ray tube A restriction area setting means that performs a restriction operation of movement of the X-ray tube within the set restriction area and other than the stop position, and a restriction force adjustment mechanism that variably adjusts the restriction force within the restriction area; A manual ceiling traveling suspended X-ray tube holding device.   2. The manual overhead traveling suspended X-ray tube holding device according to claim 1, wherein the restriction mechanism regulates movement of the X-ray tube in a horizontal direction. 3. apparatus.   2. The manual overhead traveling suspended X-ray tube holding device according to claim 1, wherein the restriction mechanism restricts movement of the X-ray tube in a vertical direction. apparatus.   4. The manual overhead traveling suspended X-ray tube holding device according to claim 3, wherein the restriction mechanism operates in a condition where the X-ray tube and the visualization means are opposed to each other. Ceiling traveling suspended X-ray tube holding device.   5. The manual overhead traveling suspended X-ray tube holding device according to claim 4, wherein, in addition to the condition, the restriction mechanism operates when the X-ray tube is within a predetermined height from the visualization means. A manual ceiling traveling suspended X-ray tube holding device.   6. The manual overhead traveling suspended X-ray tube holding device according to claim 4, wherein, in addition to the conditions, the restriction mechanism is configured such that an irradiation direction of the X-ray tube is directed to the visualization means. A manual ceiling traveling suspended X-ray tube holding device characterized in that   7. The manual overhead traveling suspended X-ray tube holding device according to claim 1, wherein at least one of the stop position and the range of the restriction area is variably adjusted. A manual ceiling traveling suspended X-ray tube holding device comprising means.   The manual overhead traveling suspended X-ray tube holding device according to any one of claims 1 to 7, further comprising: a physical quantity variable unit that variably adjusts a physical quantity that variably adjusts the regulation force within the regulation area. A manual overhead traveling suspended X-ray tube holding device.

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