JP2009148325A - Medical particle beam irradiation equipment - Google Patents

Abstract

At the same time as reducing the size of a gantry fuselage, a rotating irradiation chamber space in the gantry fuselage and a space around the II tube device further on the deeper side than the irradiation chamber are secured, and a wide range is set at a horizontal angle that constitutes the rotating irradiation chamber. A structure that forms a stable floor is proposed.
A rotating gantry in which a particle beam irradiation unit that emits a particle beam is installed in a part of a cylindrical shape, and a rear panel that is installed on the inner side of the rotating gantry from the passing region of the particle beam irradiation unit 9 16, a fixed floor 17 that is inserted from the outside of the rotating gantry into the cylindrical inner side and does not reach the passage region of the particle beam irradiation unit 9, and a moving bed mechanism disposed between the rear panel 16 and the fixed floor 16. 20, a moving floor mechanism 20 and a fixed floor 17 form a floor that maintains the lower side substantially horizontal, and a depth is specified by a rear panel 16 inside the rotating gantry. 18 is a medical particle beam irradiation apparatus for forming the device 18
[Selection] Figure 1

Description

  The present invention relates to a medical particle beam irradiation apparatus.

  In recent years, in the treatment of cancer by radiation, attention has been paid to particle beams (for example, proton beams) that can be treated without relatively damaging normal cells (in the following explanation, particle beams such as proton beams). And particle radiation including radiation)

An example of a rotary irradiation chamber for particle beam therapy using such a particle beam is described in Patent Document 1 below, for example.
In the rotating irradiation chamber for particle beam therapy described in Patent Document 1, a stationary ring rail and a moving ring rail each having a horizontal (semi-circular) path with a horizontal lower side across the particle beam irradiation unit Are placed facing each other. Insert both ends into a saddle-shaped (semi-circular) path between these fixed-side ring rails and moving-side ring rails, and pass the movable floor with a flexible structure. Forming a chamber. And the movable bed of the flexible structure inserted and arranged in the saddle type (semicircular shape) passage is moved in synchronization with the rotation of the particle beam irradiation unit (crawler type).

  The depth of the irradiation chamber is specified by the rear panel on which the moving side ring rail is installed. Further, when the particle beam irradiation unit is rotated, the moving side ring rail is rotated by the same amount as the rotation amount in the direction opposite to the rotation direction of the particle beam irradiation unit by a drive motor provided in the rotating gantry. As a result, even when the rotating gantry rotates while maintaining the opposing positional relationship between the fixed ring rail and the moving ring rail, the floor (moving bed) for accessing the treatment table and the particle beam irradiation unit is always level. It is possible to keep.

In addition, as a prior art of the above-mentioned Patent Document 1, a method for forming another rotating irradiation chamber is also described.
That is, in this rotary irradiation chamber for particle beam therapy, the depth space of the chamber is formed by the rear panel installed in the rotary capsule on the back side of the particle beam irradiation unit as viewed from the building side where the treatment table is fixed. Yes. In this space, a part of the floor surface superimposed in the direction of the rotation axis by the deck drive device and the drive device from the wall surface on the under floor side located below the bed drive device stand that is a treatment table fixed to the building side. A room is formed in which an openable floor called an overhanging deck that can be pulled out to expand the floor surface can be inserted. In addition, when the overhanging deck is opened to avoid passing the irradiation device, the floor moves to the building side where the bed driving device is installed, and the fixed floorboard and the moved floorboard are stacked, and when the closing operation is performed The laminated floorboard moves to the irradiation room side.

An example of another rotating irradiation chamber for particle beam therapy is described in Patent Document 2, for example.
In the rotary irradiation chamber for particle beam therapy described in Patent Document 2, an opening / closing mechanism having a drive mechanism for driving an openable / closable floor is located further inside the frame on the depth side (around the II tube apparatus) than the passing area of the rotary irradiation unit. Even if the rotating gantry is rotated by a roller that is disposed and attached to the base of the opening / closing mechanism, it is positioned at the lowermost part inside the frame by the rolling of the roller and the weight of the opening / closing mechanism. The open / close floor slides on the open / close mechanism in the direction of the axis of rotation of the rotating gantry. The open / close floor is housed deeper than the passing area of the rotating irradiation unit during the opening operation and the positioning pin provided at the tip during the closing operation. It is structured to be connected to the treatment table base on the building side. Furthermore, the openable floor is subdivided and at least one is connected to the treatment table base. The rotary irradiation chamber includes a rotating panel that rotates with a rotating gantry that determines the depth, a fixed wall that is fixed to the opening and closing mechanism, a rotating wall that is fixed to the inner wall of the frame that rotates together with the rotating gantry, and an open / closed floor. A (semicircular shape) chamber is formed.

JP 11-47287 A JP 2001-259058 A

  By the way, according to the above-described conventional technology, in particular, the crawler type of Patent Document 1 described above, the floor (moving floor) for accessing the treatment table and the particle beam irradiation unit is always kept horizontal regardless of the rotation of the rotating gantry. It is possible to maintain. However, in order to form a rotating irradiation chamber by disposing a moving floor on almost the entire inner surface of the rotating gantry in the fixed-side ring rail and the moving-side ring rail section arranged opposite to each other, the rotating irradiation chamber is formed between the rotating irradiation chamber and the gantry body. A gap is created. As a result, there is a problem that the gantry body becomes large when a rotating irradiation chamber having a certain size is secured. In addition, it is necessary to rotate the moving ring rail in synchronization with the rotation of the rotating gantry, and there is a problem that the structure is complicated and the maintainability is deteriorated.

  On the other hand, according to the overhanging deck type of the above-mentioned Patent Document 1, since a horizontal floor forming mechanism is not provided inside the gantry body, a certain irradiation chamber space inside the gantry body is ensured without increasing the size of the gantry body. However, the overhanging deck and its driving device are installed on the wall under the floor located under the bed driving device, which is a treatment table fixed to the building side, and one of the overhanging decks is placed in the bed driving device due to the operational interference. Since the portion cannot be inserted, the amount of protrusion in the deck depth direction (rear panel side) is limited. As a result, there is a problem that the floor area for forming the irradiation chamber is insufficient at all rotation angles, and the maintainability and safety when working in the treatment room are deteriorated.

  Further, with respect to the openable floor mechanism of Patent Document 2, the openable floor is arranged only on the lower side without depending on the rotation of the rotating gantry, so that there is a rotating wall fixed to the inner wall of the frame. The gap between the rotary irradiation chamber and the gantry body becomes small. As a result, the gantry body is not enlarged when a rotating irradiation chamber having a certain size is secured. However, the opening / closing mechanism is disposed inside the frame on the deeper side (around the II tube apparatus) than the passage area of the rotary irradiation unit. Therefore, since the space around the II tube device is narrowed, the devices inside the gantry fuselage on the back side of the irradiation chamber are densely packed and the maintainability is deteriorated, and in the worst case, the gantry fuselage is enlarged. There was a problem.

  Also, during the closing operation, the positioning pin provided at the tip of the openable floor is connected to the positioning hole provided in the treatment table base on the building side to form the floor, but the sliding amount of the openable floor is large, Since the radial position control of the opening / closing mechanism is only the rolling of the roller and the weight of the opening / closing mechanism, there is a problem that the insertion stability of the positioning pin is poor.

  The purpose of the present invention is to reduce the size of the gantry fuselage, and at the same time, secure a space for the rotary irradiation chamber in the gantry body and a space around the II tube device on the deeper side than the irradiation chamber, and a wide range of rotation angles (about ± 150 degrees) An object of the present invention is to provide a medical particle beam irradiation apparatus capable of stably forming a horizontal floor constituting a rotary irradiation chamber.

  The purpose is to provide a rotating gantry in which a particle beam irradiating part for emitting particle beams is installed in a part of a cylindrical shape, and a rear panel installed in the inner side of the rotating gantry from the passing region of the particle beam irradiating part. A fixed bed that is inserted from the outside of the rotating gantry to the inside of the cylinder and does not reach the passage region of the particle beam irradiation unit, and a moving bed mechanism disposed between the rear panel and the fixed bed, The moving floor mechanism and the fixed floor form a floor that maintains the lower side substantially horizontal, and the interior of the rotating gantry forms a space for particle beam therapy with a depth specified by the rear panel. Is achieved.

  Further, the object is that the moving floor mechanism includes a floor plate for forming a horizontal floor, a frame that supports the floor plate, and a plurality of guide rollers on the frame, and on the inner peripheral surface of the rotating gantry. This is achieved by rolling freely in the rotation direction of the particle beam irradiation unit.

  Further, the object is that the moving bed mechanism includes a driving roller on the frame and a driving device for driving the driving roller, and further the particle beam irradiation for allowing the guide roller and the driving roller to pass therethrough. This is achieved by providing guide grooves on the inner wall circumference of the rotating gantry in the room and on the outer circumference of the rear panel.

  Further, the above object is achieved by providing a structure in which the floor plate of the moving floor mechanism is configured to slide on the floor surface in a direction perpendicular to the rotation axis and to be pivotable at a joint portion with the frame.

  Further, the object is that the moving floor mechanism has a taper hole on the frame facing the fixed floor, and further, the fixed floor drives the taper pin and the taper pin on the side facing the frame. And a structure capable of inserting and withdrawing the taper pin into and from the taper hole.

  According to the present invention, simultaneously with downsizing of the gantry fuselage, a rotation irradiation chamber space in the gantry fuselage and a space around the II tube device on the deeper side than the irradiation chamber are secured, and a wide range of rotation angles (about ± 150 degrees) It is possible to provide a medical particle beam irradiation apparatus capable of stably forming a horizontal floor constituting a rotary irradiation chamber.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  The structure of the medical particle beam irradiation apparatus according to the first embodiment (Example 1) of the present invention will be described with reference to FIGS.

FIG. 1 (a) is a medical particle beam irradiation apparatus provided with a first embodiment of the present invention, and is particularly a side view along a rotation axis of a rotating gantry.
FIG.1 (b) is the side view seen from the direction perpendicular | vertical to the rotating shaft of (a).
1A and 1B, a rotating gantry includes a substantially cylindrical gantry body 1 (rotating body) having a rear ring 2 and a front ring 3, and a gantry rotating motor 7 (rotating device) for rotating the gantry body 1. And. The gantry body 1 is supported by a radial support device 6 fixed to a building 5 composed of a plurality of support rolls rotatably provided at the rear ring 2 and the front ring 3 provided at one end thereof. ing.

  Further, outside the gantry body 1, a cable carrier 4 for supplying wiring and piping to a rotating gantry rotating 360 degrees, a beam transport device 8 equipped with an electromagnet such as a deflection electromagnet, and the center of gravity position of the entire rotating gantry with rotation A balance weight 10 is provided for correcting the above. Further, a particle beam irradiation unit 9 that adjusts the irradiation beam according to the shape of the affected part is provided extending inside. These rotate with the rotation of the rotating gantry (gantry body 1). Further, the particle beam irradiation unit 9 is provided with shock absorbers 11 at both ends thereof to prepare for contact with the moving floor plate mechanism 20 during rotation of the rotating gantry.

  On the other hand, an irradiation chamber 18 for particle beam therapy for performing particle beam therapy is configured inside the gantry body 1. That is, the irradiation room 18 for particle beam therapy provides, for example, a closed space for a medical engineer to work, and the bottom surface of the irradiation room 18 is secured regardless of the rotation of the rotating gantry (gantry body 1) in order to secure a scaffold for workers. Is kept horizontal. In addition, the II tube device 15 is installed further behind the rear panel 16 that closes the depth side of the irradiation chamber 18 and rotates with the rotation of the rotating gantry (gantry body 1). The II tube device 15 has a structure that protrudes into the irradiation chamber 18 when the affected part is positioned.

  The treatment table 12 is inserted into the irradiation room 18 from the building 5 side, and the affected part of the patient placed on the treatment table 12 is irradiated with the particle beam from the particle beam irradiation unit 9. The position (displacement, angle, etc.) of the treatment table 12 is controlled by a treatment table driving device 14 and a treatment table position control device 13 installed in the building 5.

  Furthermore, as will be described later in detail, a fixed floor 17 installed on the wall surface of the treatment table driving device 14 is used for accessing the irradiation chamber 18 from the treatment table position control device 13 side.

Next, details of the irradiation room 18 for particle beam therapy will be described with reference to FIGS.
FIG. 2 is a side view along the rotation axis of the entire irradiation chamber 18.
FIG. 3 is a perspective view of the moving floor mechanism 20.
FIG. 4 is a plan view of the moving floor mechanism 20 as viewed from below.
5 and 6 are schematic views showing the lock mechanism of the moving floor mechanism 20. FIG.
In each figure, as is apparent from FIG. 2, the irradiation room 18 for particle beam therapy constitutes a horizontal access floor by the moving bed mechanism 20 and the fixed floor 17, and is partitioned by the rear panel 16 including the particle beam irradiation unit 9. It is a space in the gantry body 1 that has been made. The moving bed mechanism 20 is disposed in the irradiation chamber 18 and has a structure that can be independently driven in the rotational movement direction of the particle beam irradiation unit 9 as described later.

  As shown in FIGS. 3 and 4, the movable floor mechanism 20 forms a main skeleton with movable floor plates 21 a, 21 b, 21 c, a base base 22, side plate frames 23, and a top plate frame 24. Both ends of the “U” -shaped base base 22 and the top plate frame 24 are joined by two side plate frames 23, and both ends of the top plate frame 24 not joined to the side plate frame 23 are connected to a cylindrical shape. A large number of moving floor plates 21 a are connected by a hinge 34.

  A large number of adjacent moving floor plates 21a without using the top plate frame 24 are coupled by the connecting slots 31 so as to form substantially the same plane. Further, a large number of cylindrical moving floor plates 21b that are slightly smaller than the dimensions of the moving floor plate 21a and connected by connecting rods 31 are inserted into the moving floor plate 21a. The inserted movable floor plate 21b is slidable within the movable floor plate 21a, and the linear guide 28 and the ball screw 29 installed on the movable floor plate 21a and a part of the movable floor plate 21b, and an actuator for controlling them. 30 is controlled.

  Similarly, the moving floor plate 21c is inserted into the moving floor plate 21b, and the slide amount is controlled by the linear guide 28, the ball screw 29, and the actuator 30. Further, guide rollers 25b are provided at both end portions (locations away from the top plate frame 24) of the movable floor plates 21c group. A driving roller 25a and a plurality of guide rollers 25b are attached to the outer surface of the side plate frame 23 (the surface opposite to the surface coupled to the base table 22). Among these, the drive rollers 25 a on both sides of the side plate frame 23 are connected by a drive shaft 32, and a drive gear 33 is provided in the middle of the drive shaft 32. The driving force generated by the controllable driving device 26 installed on the base table 22 is transmitted to the driving gear 33, whereby the rotation amount of the driving roller 25a is controlled. As shown in FIG. 2, the moving bed mechanism 20 is disposed around the lowermost part of the gantry body 1 divided by the front ring 3 and the rear panel 16 so that the drive shaft 32 is parallel to the rotation axis. ing.

  Further, as shown in FIG. 2, a gantry body side guide groove 27 a is provided on the entire circumference of the gantry body 1 near the rear panel 16 and the front ring 3 in the irradiation chamber 18. Further, a rear panel side guide groove 27 b is provided on the entire periphery of the rear panel 16. Each roller (drive roller 25a, guide roller 25b) of the moving floor mechanism 20 is inserted into these guide grooves. Thereby, it is possible to make the movement direction of the moving bed mechanism 20 the same as the rotational movement direction of the particle beam irradiation unit 9.

  On the other hand, a fixed floor 17 is installed on the wall surface of the treatment table driving device 14 toward the front ring 3 to the vicinity of the moving floor plate 21 and the side plate frame 23 of the moving floor mechanism 20, and the irradiation room 18 from the treatment table position control device 13 side. Access to the (moving floor mechanism 20) is enabled. Further, the shape is such that the cross section is crushed by a semicircle (the upper part is a straight line, the lower part is an arc), and the arc-shaped part also serves as a guide through which each roller 25 of the moving floor mechanism 20 passes.

  The fixed floor 17 is provided with a taper pin 42 and an actuator 43, and the taper pin 42 can be expanded and contracted in the gantry axis direction by the actuator 43. Further, a taper pin hole 41 corresponding to the taper pin 42 is provided on the outer surface of the side plate frame 23 of the moving floor mechanism 20 (the surface opposite to the surface coupled to the base table 22). It is possible to maintain the position of 20 or to correct a slight horizontal position error (position of the moving floor mechanism 20 in the circumferential direction) of the moving floor plate 21.

5A and 5B show the detailed structure of the lock mechanism.
In FIG. 5 (a), even when the moving floor mechanism 20 has a position error with respect to some circumferential direction at the time of locking, the taper pin 42 and the taper pin hole 41 have a taper structure and can be corrected. Further, when the taper pin 42 is inserted into the taper pin hole 41, the movement of the moving bed mechanism 20 is limited, and the position can be maintained.

  On the other hand, at the time of unlocking shown in FIG. 5 (b), the taper pin 42 is extracted from the taper pin hole 41, and movement by driving the drive roller 25 a of the moving bed mechanism 20 is possible. In addition, the range (rotation angle) which can lock the movable floor mechanism 20 can also be increased by providing the taper pins 42 and the actuators 43 disposed on the fixed floor 17 at several locations. The lock mechanism can be driven by a pneumatic cylinder or electric based on LS and encoder information.

  Further, as shown in FIGS. 6A and 6B, a compression pin 45 can be used in place of the actuator 43, and a mechanical pin pulling dog 44 can be arranged and linked on the inner periphery of the gantry. In this case, the link is disengaged only in the vicinity of the nozzle.

FIGS. 7A to 7C are views showing the formation state of the irradiation chamber 18 accompanying the rotation of the rotating gantry.
7A shows a case where the rotation angle is 0 degree, FIG. 7B shows a rotation angle of 100 degrees, FIG. 7C shows a rotation angle of 130 degrees, and FIG. 7D shows a rotation angle of 180 degrees.

  In FIG. 7, when the rotation angle is 0 ° to 100 ° (a⇒b), the particle beam irradiation unit 9 and the moving floor plate 21 do not interfere with each other, so that a horizontal floor is formed using all the moving floor plates 21. Next, when the rotation angle is from 100 ° to 130 ° (b⇒c), the moving floor plate 21 on one side is slid by the linear guide 28, the ball screw 29, and further the actuator 30, and folded to interfere with the particle beam irradiation unit 9. To avoid. In this case, the movable floor board 21 that is not folded forms a horizontal floor. Further, when the rotation angle is 130 ° to 180 ° (c⇒d), the side plate frame 23 needs to be moved by the driving roller 25a in order to avoid interference with the particle beam irradiation unit 9. At this time, by folding the moving floor plate 21 far from the particle beam irradiation unit 9 and controlling the slide amount, a horizontal floor can be formed although there is a step in the vertical direction with the fixed floor 17.

  As described above, by providing the taper pins 42 and the actuators 43 disposed on the fixed floor 17 at several positions, the movable floor mechanism 20 can be locked even when the rotation angle exceeds 130 °, and stable. A flat floor can be formed. Further, when the taper pin hole 41 comes above the fixed floor 17, the lock mechanism cannot be used. However, all the guide rollers 25b of the moving bed mechanism 20 are fitted in the guide grooves 27, and the position of the moving bed 20 is fixed and supported by the shock absorber 11 attached to the driving roller 25a and the particle beam irradiation unit 9, It is possible to form a stable horizontal floor.

  As described above, according to the medical particle beam irradiation apparatus of the present invention, as shown in FIG. 2, the rear panel 16 installed behind the passage region of the particle beam irradiation unit 9 and the building inside the rotating gantry. 5 for the particle beam therapy by the fixed floor 17 installed from the wall surface of the treatment table drive device 14 installed in the direction 5 toward the front ring 3 and the moving bed mechanism 20 arranged between the rear panel 16 and the fixed floor 17. An irradiation chamber 18 is formed.

  The moving bed mechanism 20 is a mechanism that can roll in the rotation direction of the particle beam irradiation unit 9 on the inner peripheral surface of the rotating gantry along various guide grooves provided in the irradiation chamber 18. Only the lower side of the rotating gantry is placed.

  This makes it possible to simultaneously secure the irradiation chamber 18 space inside the rotating gantry and the space around the II tube device 15 on the depth side from the irradiation chamber without increasing the size of the rotating gantry. Moreover, the floor area is ensured by reducing the gap between the movable floor portion 21 of the movable floor mechanism 20 and the fixed floor 17 and the rear panel 16, and maintainability and safety when working in the irradiation chamber 18 are ensured. It becomes possible to do.

  Further, the movable floor plate 21 of the movable floor mechanism 20 is divided into a plurality of parts, and is configured to slide in a direction perpendicular to the rotation axis on the floor surface using a linear guide 28 and a ball screw 29. Further, one end portion of the movable floor plate 21 is coupled to the top plate frame 24 by a hinge 34 shown in FIG. 4 so as to be rotatable, and the other end portion is provided with a guide roller 25b, and on various guide grooves 27 provided in the irradiation chamber 18. Since it rolls, it has a structure that can be folded in the rotational direction of the particle beam irradiation unit 9.

  Further, the moving bed mechanism 20 is provided with a driving roller 25a and a driving device 26, and can freely roll on the inner peripheral surface of the rotating gantry. Thereby, when it interferes with the particle beam irradiation part 9, only the movable floor board 21 or the whole movable bed mechanism 20 can be escaped. Further, it is possible to selectively form a horizontal floor surface, and to form a floor that maintains the lower side substantially horizontal by the moving floor mechanism 20 and the fixed floor 17 in spite of the rotation of the rotating gantry. It becomes possible.

  Further, by narrowing the gap between the moving floor mechanism 20 and the fixed floor 17 and providing a locking mechanism with the taper pin hole 41 and the taper pin 42 between them, the position of the moving floor mechanism 20 and the positional error in the circumferential direction are slightly reduced. Not only can correction be possible, but also the insertion stability of the positioning pin can be improved.

  As described above, according to the first embodiment of the present invention, at the same time as reducing the size of the gantry fuselage, the space for the rotary irradiation chamber in the gantry fuselage and the space around the II tube device on the deeper side than the irradiation chamber are secured. The horizontal floor constituting the rotary irradiation chamber can be stably formed regardless of the rotation. Therefore, an excellent medical particle beam irradiation apparatus including workability can be realized.

Next, a medical particle beam irradiation apparatus according to the second embodiment of the present invention will be described in detail with reference to FIGS.
In the second embodiment, parts other than the moving bed mechanism 20 have the same structure as that of the first embodiment, and the description thereof is omitted.

FIG. 8 is a perspective view showing the entire structure of the moving bed mechanism 20, which is a medical particle beam irradiation apparatus according to the second embodiment of the present invention.
FIG. 9 is a perspective view showing the cradle part of the moving floor mechanism 20.
FIG. 10 is a perspective view showing a turning portion of the moving floor mechanism 20.
FIG. 11 is a view showing the movable floor board 21.
FIG. 12 is a view showing the formation state of the irradiation chamber 18 accompanying the rotation of the rotating gantry.
In the following description, the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof will be omitted as appropriate.

  In FIG. 8, the moving floor mechanism 20 is composed of a rocking portion, a turning portion, and a moving floor plate 21. In the cradle part, a plurality of guide rollers 25b provided on the side plate frame 23 move along various guide grooves 27 provided in the irradiation chamber 18, so that the particle beam irradiation unit 9 rotates in the rotation direction on the inner peripheral surface of the rotating gantry. Since it is a rollable mechanism, it is disposed substantially below the rotating gantry. The driving roller 25a and the driving device 26 are not installed, and a nozzle projecting portion 50 is provided instead, and is in contact with the shock absorber 11 provided in the particle beam irradiation unit 9. At this time, the moving bed mechanism 20 moves together with the particle beam irradiation unit 9. The turning portion is connected to the side plate frame 23 of the rocking heel portion, and is configured to turn around the center of the cradle portion outer peripheral side by driving means provided in the rocking heel portion. The moving floor board part is divided into a plurality of parts, and is supported by a turning part frame 58 which is normally in the direction of gravity. At a position where it interferes with the particle beam irradiation unit 9, the structure is configured such that it slides and turns to retreat. Details of each part will be described below.

  First, as shown in FIG. 9, the cradle portion has a base frame 22, a top plate frame 24, and both ends of the nozzle trailing projection 50 connected by two side plate frames 23 to form a skeleton. A drum 54, a motor 55 with brake, a speed reducer 56, and a rope wheel 57 are mounted on the base table 22 to drive the turning portion, and the winding amount of the wire rope 53 is controlled. Since the swivel portion naturally contracts in the direction of gravity, the winding force of the wire rope 53 provides a driving force only in the direction in which the swivel portion extends (lifts).

  Next, with respect to the turning portion, as shown in FIG. 10, a turning portion frame 58, a turning portion frame connecting portion 59, and a turning portion frame side coupling portion 60 are provided. The turning part frame 58 is fitted into the turning part coupling part 51 and the turning part guide groove 52 at the outer peripheral ends of the two side plate frames 23 facing each other, and turns around the turning part coupling part 51. In addition, the left and right swivel unit frames 58 are coupled at the center by a swivel unit frame coupling unit 59, and the rotational motion is converted into a linear motion. The swivel position is controlled by the wire rope 53 shown by the cradle portion. Here, the left and right swivel unit frames 58 are configured to swivel synchronously, but can be independently controlled by removing the swivel unit frame connection unit 59. In addition, a moving bed side coupling portion 61 provided on a moving floor plate 21a described later is inserted into the turning portion frame side coupling portion 60 provided in the turning portion frame 58.

  Next, as shown in FIG. 11, the movable floor plate 21 is composed of a plurality of plates 21 a, 21 b, and 21 c and is supported by the turning unit frame 58. The movable floor boards 21 are linked together and have a mechanism that slides on the board surface. The moving floor plate 21 is degenerated by being pushed by the particle beam irradiation unit 9 and is extended by, for example, a torque reel and a wire.

Finally, FIGS. 12A to 12D show the formation state of the irradiation chamber 18 accompanying the rotation of the rotating gantry.
12A shows a case where the rotation angle is 0 degree, FIG. 12B shows a rotation angle of 100 degrees, FIG. 12C shows a rotation angle of 155 degrees, and FIGS. 12D and 12E show a case where the rotation angle is 180 degrees. . When the rotation angle is 0 ° to 100 ° (a⇒b), the particle beam irradiation unit 9 and the moving floor plate 21 do not interfere with each other, so that a horizontal floor is formed using all the moving floor plates 21. Next, when the rotation angle is 100 degrees to 155 degrees (b⇒c), the movable floor plate 21 on one side slides and folds to avoid interference with the particle beam irradiation unit 9.

  In this case, the movable floor board 21 that is not folded forms a horizontal floor. When the rotation angle is 155 degrees, the nozzle projecting portion 50 in the cradle portion and the shock absorber 11 provided in the particle beam irradiation unit 9 come into contact with each other. Furthermore, since the moving bed mechanism 20 rotates with the rotation of the particle beam irradiation unit 9 from the rotation angle 155 degrees to 180 degrees (c => d), all the horizontal portions disappear. Further, in this rotational angle region, the pushed-up moving bed mechanism 20 may interfere with the treatment table 12 during non-coplanar irradiation. Therefore, as shown in FIG. 12 (e), it is possible to control the winding amount of the wire rope 53 and to degenerate the swivel portion to narrow the interference region.

  In summary, it is possible to form a horizontal floor within the range of the rotation angle ± 155 degrees, and the taper pin hole 41 provided in the side plate frame 23 and the fixed floor 17 are installed as in the first embodiment. By using a locking mechanism with the taper pin 42, a stable horizontal floor can be formed. In addition, in a range of rotation angles other than this, a horizontal floor portion cannot be formed, but by reducing the swivel portion and narrowing the interference area with the treatment table 12, the first embodiment and The irradiation chamber 18 having the same size can be obtained. As a result, except for a very special treatment, the treatment can be performed with the same size of the rotating gantry as the first embodiment.

  As described above, according to the second embodiment of the present invention, the size of the gantry fuselage is reduced, and at the same time, the rotation irradiation chamber space in the gantry fuselage and the space around the II tube device on the deeper side than the irradiation chamber are secured. It is possible to stably form a horizontal floor constituting the rotary irradiation chamber at a rotation angle (about ± 150 degrees). Therefore, an excellent medical particle beam irradiation apparatus including workability can be realized.

  As described above, according to the present invention, in the rotating gantry in which the particle beam irradiation unit that emits the particle beam is installed in a part of the cylindrical shape, the rotation gantry has a deeper interior than the passage region of the particle beam irradiation unit. A rear panel installed on the side, a fixed floor that is inserted from the outside of the rotating gantry into the cylindrical inner side and does not reach the passage region of the particle beam irradiation unit, and between the rear panel and the fixed floor Particle beam therapy comprising a movable floor mechanism arranged, forming a floor that maintains the lower side substantially horizontal by the movable floor mechanism and the fixed floor, and specifying a depth by the rear panel inside the rotating gantry Provided is a medical particle beam irradiation apparatus that forms a space (particle beam treatment room) for medical use. Accordingly, it is possible to simultaneously secure the irradiation chamber space inside the rotating gantry and the space around the II tube device on the depth side from the irradiation chamber without increasing the size of the rotating gantry. In addition, the floor area is secured by reducing the gap between the moving floor portion of the moving floor mechanism, the fixed floor, and the rear panel, and maintenance and safety are ensured when working in the treatment room.

  According to the present invention, in the medical particle beam irradiation apparatus described above, the moving floor mechanism includes a floor plate for forming a horizontal floor, a frame that supports the floor plate, and a plurality of members on the frame. It is preferable to include a guide roller, a driving roller, and a driving device that drives the driving roller. Furthermore, it is preferable that guide grooves are provided on the inner wall circumference of the gantry body in the particle beam irradiation chamber and on the outer circumference of the rear panel for the guide roller and the drive roller to pass through. Accordingly, the moving bed mechanism can freely roll in the rotation direction of the radiation irradiation unit on the inner peripheral surface of the rotating gantry.

  Further, according to the present invention, in the medical particle beam irradiation apparatus described above, the floor plate of the moving bed mechanism is divided into a plurality of pieces and is configured to slide in a direction perpendicular to the rotation axis on the floor surface, It is preferable to have a structure that can pivot at the joint with the frame. For example, a linear guide and a ball screw are used for the sliding mechanism, a hinge is used for the connecting part of the floor plate and the frame for the turning structure, and a guide roller is provided at the end of the moving floor part opposite to the connecting part. It becomes possible. Accordingly, it is possible to form a floor that maintains the lower side substantially horizontal by the moving floor mechanism and the fixed floor, regardless of the rotation of the rotating gantry.

  Furthermore, according to the present invention, in the medical particle beam irradiation apparatus described above, it is preferable that the moving bed mechanism has a tapered hole on the frame facing the fixed bed. Furthermore, it is preferable that the fixed floor includes a taper pin on the side facing the frame and an actuator for driving the taper pin, and has a structure in which the taper pin can be inserted and removed from the taper hole. As a result, it is possible to maintain the position of the moving bed mechanism and to correct some position errors in the circumferential direction of the moving bed mechanism. Further, since the interval between the fixed floor and the frame of the moving floor mechanism is narrow and the hole and the pin shape are tapered, the insertion stability of the positioning pin is also improved.

1 is a side view showing a medical particle beam irradiation apparatus according to a first embodiment of the present invention, particularly focusing on its rotating gantry. FIG. It is a side view which shows the principal part detailed structure of the irradiation chamber for particle beam therapy of the rotating gantry shown in the said FIG. It is a perspective view of a moving floor mechanism in the said FIG. It is the top view which looked at the moving floor mechanism from the lower side in the said FIG. It is the figure which showed the locking mechanism of the moving floor mechanism in the said FIG. It is the figure which showed the other locking mechanism of the moving floor mechanism in the said FIG. It is the figure which showed the formation condition of the irradiation chamber accompanying rotation of the rotation gantry in the said FIG. It is a perspective view which shows the whole structure of the medical particle beam irradiation apparatus used as the 2nd Example of this invention, especially a moving bed mechanism. It is a perspective view which shows the rocking | fluctuation part of a moving floor mechanism in the said FIG. It is a perspective view which shows the turning part of a moving floor mechanism in the said FIG. It is a perspective view which shows the moving floor board of a moving floor mechanism in the said FIG. It is the figure which showed the formation condition of the irradiation chamber accompanying rotation of the rotation gantry in the said FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gantry fuselage 2 Rear ring 3 Front ring 4 Cable bear 5 Building 6 Radial support device 7 Gantry rotation motor 8 Beam transport device 9 Particle beam irradiation part 10 Balance weight 11 Shock absorber 12 Treatment table 13 Treatment table position control device 14 Treatment table Driving device 15 II tube device 16 Rear panel 17 Fixed floor 18 Irradiation chamber 20 Moving floor 21 Moving floor plate 22 Base table 23 Side plate frame 24 Top plate frame 25a Driving roller 25b Guide roller 26 Driving device 27a Gantry fuselage side guide groove 27b Rear panel side Guide groove 28 Linear guide 29 Ball screw 30, 43 Actuator 31 Linking rod 32 Drive shaft 33 Drive gear 34 Hinge 41 Taper pin hole 42 Taper pin 44 Pin pulling dog 45 Compression spring 50 Nozzle trailing part 51 Turning part coupling part 52 Turning part guiding groove 3 the wire rope 54 drum 55 with brake motor 56 reduction gear 57 sheave 58 swivel unit frame 59 pivoting unit frame connecting portion 60 swivel part frame-side coupling portion 61 moving bed-side coupling part

Claims (5)

A rotating gantry in which a particle beam irradiation unit that emits a particle beam is installed in a part of a cylindrical shape, a rear panel that is installed inside the rotation gantry at a depth side from a passing region of the particle beam irradiation unit, and the rotation A fixed floor that is inserted from the outside of the gantry to the inside of the cylinder and does not reach the passage region of the particle beam irradiation unit, and a moving bed mechanism that is disposed between the rear panel and the fixed floor. ,
The moving bed mechanism and the fixed floor form a floor that maintains the lower side substantially horizontal, and the space for particle beam therapy having a specified depth is formed by the rear panel inside the rotating gantry. Medical particle beam irradiation device. In the medical particle beam irradiation apparatus according to claim 1,
The moving floor mechanism includes a floor plate for forming a horizontal floor, a frame that supports the floor plate, and a plurality of guide rollers on the frame, and the particle beam irradiation on the inner peripheral surface of the rotating gantry. A particle beam irradiation apparatus for medical use, which freely rolls in the rotation direction of the part. In the medical particle beam irradiation apparatus according to claim 2,
The moving bed mechanism includes a driving roller on the frame and a driving device that drives the driving roller, and the rotating gantry in the particle beam irradiation chamber through which the guide roller and the driving roller pass. A medical particle beam irradiation apparatus comprising a guide groove on the inner wall circumference of the rear panel and on the outer circumference of the rear panel. In the medical particle beam irradiation apparatus according to claim 3,
The medical particle beam irradiation apparatus according to claim 1, wherein the floor plate of the moving floor mechanism is configured to slide on the floor surface in a direction perpendicular to the rotation axis, and is configured to be pivotable at a coupling portion with the frame. In the medical particle beam irradiation apparatus according to claim 4,
The moving floor mechanism includes a taper hole on the frame facing the fixed floor, and the fixed floor further includes a taper pin on a side facing the frame, and means for driving the taper pin, A medical particle beam irradiation apparatus comprising a structure in which the taper pin can be taken in and out of the taper hole.

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