JP2008264311A - Medical particle beam radiation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a particle radio therapy rotational radiation chamber, which is capable of making a rotating gantry barrel compact in size, and securing a further vacant space around a particle beam radiation part. <P>SOLUTION: A rotation irradiation chamber for particle beam radiation therapy includes: a rotating gantry 2 fixing a particle beam radiation part for emitting particle beam to a part of a cylinder; a moving side frame 20 which is relatively rotatable inside the rotating gantry; a moving side moving floor-guiding part 21 fixed to the moving side frame; a fixed side frame 10 which is placed to be opposition to the moving side frame and is fixed in the rotating gantry; a fixed side moving floor-guiding part fixed to the fixing side frame; and a moving floor 30 which has one end engaged with the moving side moving floor-guiding part and the other end engaged with the fixed side moving floor-guiding part, can move, and can freely bend in the moving direction. The chamber is provided with mechanisms (32, 35, and the like) in which a barrel side moving floor-guiding part 51 is directly fixed onto the inner surface of the rotating gantry and engagement of one end of the moving floor is handed over to a barrel side moving floor-guiding part from the moving side moving floor-guiding part at a prescribed position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a medical particle beam irradiation apparatus, and more particularly to a structure of a rotary irradiation chamber for particle beam therapy formed by a floor (moving floor) that is always horizontal even when a rotating gantry rotates.

  In recent years, in the cancer treatment by radiation, a particle beam (for example, proton beam) that can be treated without relatively damaging normal cells has attracted attention. In addition, in the following description, particle beams, such as these proton beams, radiation, etc. are included and demonstrated as particle beams.

  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. That is, in this rotary irradiation chamber for particle beam therapy, the stationary ring rail and the moving ring rail are formed opposite to each other, with the particle beam irradiation unit interposed therebetween, each having a horizontal (semi-circular) -shaped passage on the lower side. Between these rails, both ends are inserted into the corrugated (semicircle) type passage, and a movable floor having a flexible structure is passed, thereby forming a chamber having a semicircular cross section, and The movable bed having a bendable structure, which is inserted and arranged in a bowl (semicircle) type passage, is moved in synchronization with the rotation of the particle beam irradiation unit. Further, when rotating the particle beam irradiation unit, the moving 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, the floor (moving bed) for accessing the treatment table and the particle beam irradiation unit is always horizontal even when the rotating gantry rotates while maintaining the opposing positional relationship between the stationary ring rail and the moving ring rail. It is possible to make it.

  Further, as one of the performances required for the particle beam irradiation part, it is possible to mold the irradiation range of the particle beam according to the shape of the affected part. A multi-leaf collimator is known as one of the means for that purpose, and an example thereof is described in Patent Document 2 below. That is, this multi-leaf collimator is composed of two leaf plate driving bodies that are movably arranged so as to overlap a large number of shielding plates (leaf plates) having the ability to shield particle beams. Place the particle beam traveling path from the source toward the affected area so that the end of multiple leaf plates of both leaf plate drivers face each other, and form an irradiation field of the particle beam between them It is arranged. And in each leaf plate driving body, by individually adjusting the position of each leaf plate using the driving force of driving means such as an electric motor, a plurality of leaf plates of the leaf plate driving body on one side, A space similar to the irradiation range is formed between the leaf plates of the leaf plate driving body on the other side, and only the particle beam directed to the desired irradiation region is allowed to pass therethrough. An irradiation field in which the beam is shaped at the affected area can be formed.

  That is, according to the application of such a multi-leaf collimator, the cost is low compared to the case where a collimator manufactured by casting is individually applied according to the irregular shape of the irradiation target. By using the driving means, there is an advantage that the time required for setting the irradiation range can be shortened.

JP 11-47287 A JP2002-224230

  By the way, according to the above-described prior art, particularly, the above-mentioned Patent Document 1, 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. However, in order to apply the multi-leaf collimator disclosed in Patent Document 2 described above and adjust its position individually by using the driving means, the apparatus becomes complicated, and There has been a problem that the particle beam irradiation section is enlarged.

  That is, in the rotary irradiation chamber for particle beam therapy known from the above-mentioned Patent Document 1, when the particle beam irradiation part is enlarged, the space for arranging the enlarged particle beam irradiation part is secured and its maintenance is performed. In order to improve the performance, it is necessary to secure sufficient free space around the particle beam irradiation unit at all rotation angles of the rotating gantry. Downsizing of rotating gantry is also an important issue.

  However, in the structure of the conventional rotary irradiation chamber for particle beam therapy, the size of the rotary irradiation chamber for particle beam therapy is formed in a semicircular ring rail formed on the moving side ring rail. Therefore, the space around the particle beam irradiation part in the rotating gantry body is not changed without changing the size of the rotary irradiation chamber for particle beam therapy (in other words, without changing the size of the moving ring rail). In order to expand the space, it is necessary to widen the gap between the moving ring rail and the rotating gantry body, that is, to increase the size of the rotating gantry. For this reason, in the above-described prior art, it has been difficult to secure a further empty space around the particle beam irradiation unit and simultaneously satisfy the downsizing of the rotating gantry.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and its purpose is to secure a further free space around the particle beam irradiation unit as well as downsizing the rotating gantry body. The object is to propose a structure of a rotary irradiation chamber for particle beam therapy that can be achieved.

  In order to achieve the above object, according to the present invention, a rotating gantry in which a particle beam irradiating unit for emitting particle beams is installed in a part of a cylindrical shape, and a rotating gantry that is relatively rotatably supported inside the rotating gantry. A moving side frame, a moving side moving floor guide portion attached to the moving side frame, a fixed side frame disposed and fixed facing the moving side frame in the rotating gantry, and the fixed side frame A fixed-side moving floor guide portion fixed to the head, one end engaged with the moving-side moving floor guide portion, and the other end engaged with the fixed-side moving floor guide portion so as to be movable and bendable in the moving direction A medical particle beam irradiation apparatus that forms a space for particle beam therapy by maintaining the lower side of the moving bed substantially horizontal in spite of rotation of the rotating gantry. The fuselage-side moving floor guide portion is directly attached on the inner peripheral surface of the rotating gantry, and at a predetermined position in the rotating gantry, one end of the moving bed is engaged with the moving-side moving floor guide portion. There is provided a medical particle beam irradiation apparatus provided with means for delivering the above from the moving side moving bed guide part to the trunk side moving bed guide part.

  According to the present invention, in the medical particle beam irradiation apparatus described above, the delivery means includes a pin that can be taken in and out, and a groove of the moving side moving floor guide portion or the trunk side moving floor guide. It is preferable to include a hanging device that can be freely engaged with the groove of the part, and a means for controlling the insertion and removal of the pins of the hanging device, and further, the means for controlling the insertion and removal of the pins of the hanging device, It is preferable to control the loading and unloading of the pins of the hanging device by irradiating the moving floor with a light control signal at a predetermined position in the rotating gantry, and the means for irradiating the light control signal comprises: Laser light generating means is preferred.

Moreover, according to the present invention, in the medical particle beam irradiation apparatus described above, the plate-like member constituting the moving bed as means for delivering from the moving side moving bed guide part to the trunk side moving floor guide part Is preferably movable in the direction of the rotation axis of the rotating gantry. In this case, a sliding device is further attached to a plate-like member constituting the moving floor, and the sliding device is attached to the moving side moving floor guide portion and It is preferable to provide a sliding portion formed on the trunk-side moving floor guide portion, and thus move the plate-like member by moving the slide device along the sliding portion. Furthermore, it is preferable that the sliding portion formed on the trunk side moving floor guide portion includes an inclined portion at a predetermined position in the rotating gantry.
Each plate-like member constituting the moving floor preferably includes a wheel, and the moving floor wheel is preferably capable of inclining in the traveling direction.

  Furthermore, in the medical particle beam irradiation apparatus described above, the moving side frame may rotate in the opposite direction to the rotation direction in synchronization with the rotation of the rotating gantry, or the moving bed may have a plurality of plates. It is preferable that a stopper for limiting the bending of the adjacent plate-like member is provided.

  That is, according to the present invention, the guide for forming the moving floor is a guide on the moving side ring rail that maintains the positional relationship with the fixed side ring rail even when the rotating gantry rotates, and the rotation and movement of the rotating gantry. Divide into guides to share. Moreover, the clearance between the moving side ring rail and the rotating gantry body is provided by making the size of the moving side ring rail smaller than the inner diameter of the rotating gantry body. Furthermore, the guide on the moving ring rail is used to guide the moving floor of the part that forms the substantially horizontal access floor.

  In the present invention, the guides that rotate and move the rotating gantry are provided on the circumference except for the entire circumference or a part thereof that is relatively close to the inner circumference of the rotating gantry body. In the guide provided on the moving side ring rail and the guide provided on the rotating gantry fuselage, the guide that becomes the passage of the moving floor is partially removed, but by providing a delivery mechanism on the moving side or the fixed side ring rail on the opposite side It becomes possible to deliver on the guide of the moving floor.

  This makes it possible to provide a gap between the moving ring rail and the rotating gantry fuselage, ensuring more free space around the particle beam irradiation unit at all rotation angles of the rotating gantry, and comparing it with the inner periphery of the rotating gantry fuselage. By using a guide section that is close to the target and forming a rotating irradiation chamber for particle beam therapy, an irradiation chamber that is the same size as the rotating irradiation chamber for particle beam therapy in the prior art can be reduced in size. While you can get.

  As described above, according to the present invention, it is possible to simultaneously secure a further empty space around the particle beam irradiation unit that does not depend on the rotation position of the particle beam irradiation apparatus and to reduce the size of the rotating gantry body. The effect is also excellent.

  Hereinafter, embodiments of the present invention will be described in detail 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.

  First, FIG. 1 is a perspective view showing a rotating gantry used for the medical particle beam irradiation apparatus according to the first embodiment (Example 1) of the present invention. As shown in the figure, the rotating gantry 1 includes a substantially cylindrical gantry body 2 (rotating body) having a front ring 3 and a rear ring 8, and a gantry rotating motor 7 (rotating device) that rotates the gantry body 2. It has. The gantry body 2 is supported by a plurality of support rolls 6 rotatably provided at the front ring 3 and the rear ring 8 provided at one end thereof.

  In addition, a beam transport device 5 equipped with an electromagnet such as a deflection electromagnet is provided outside the gantry body 2, and a particle beam irradiation unit 4 for adjusting the irradiation beam in accordance with the shape of the affected part is provided therein. These are extended, and these rotate as the rotating gantry 1 (gantry body 2) rotates. On the other hand, an irradiation chamber 43 for particle beam therapy for performing particle beam therapy is configured inside the gantry body 2. That is, the irradiation room 43 for particle beam therapy provides, for example, a closed space for a medical engineer to work, and regardless of the rotation of the rotating gantry 1 (gantry body 2) in order to secure a scaffold for the worker. Always keep its underside horizontal.

  In FIG. 1, reference numeral 10 denotes a fixed side frame, 11 denotes a fixed side moving floor guide, 22 denotes a rear panel, and 25 denotes a moving side frame support. Yes. Reference numeral 30 is a moving floor, 31 is a moving floor wheel, and 33 is a laser signal generator.

  Next, the detailed structure of the irradiation room 43 for particle beam therapy will be described with reference to FIGS. 2 is a longitudinal sectional view showing the detailed structure of the main part of the irradiation chamber 43 for particle beam therapy, in particular, FIG. 3 shows the rotary gantry shown in FIG. FIG. 4 is a transverse sectional view as seen from the VV direction, and FIG. 4 is a longitudinal sectional view of the rotating gantry shown in FIGS. 2 and 3 as seen from the WW direction.

  As is apparent from these drawings, the irradiation chamber 43 for particle beam therapy is arranged with the rotation path of the particle beam irradiation unit 4 interposed therebetween and moves with the rotation, and the depth side of the irradiation chamber 43. This is a space substantially surrounded by the rear panel 22 to be closed and the support frame 50. The main components include the body side moving floor guide 51, the fixed side frame (ring member) 10, the moving side frame 20, and the moving floor 30 together with the support frame 50 described above.

  Among these, the support frame 50 and the torso side moving floor guide 51 are fixed to the inner peripheral surface of the gantry body 2. That is, as shown in FIG. 4, the support frame 50 and the trunk side moving floor guide portion 51 are fixed on the inner peripheral surface of the gantry trunk 2 except for the periphery of the particle beam irradiation unit 4.

  On the other hand, the fixed side frame 10 is disposed on the front ring 3 side of the gantry body 2 and is fixed to the ceiling and floor of the building 42 as is apparent from the drawing. The fixed side frame 10 has a so-called saddle (semicircle) fixed side moving floor formed along the inner side surface thereof, that is, the lower side thereof is horizontal and the upper side thereof is formed in an arc shape. A guide portion 11 is attached, and a guide groove is formed in the guide portion 11 as shown in the figure.

  The moving side frame 20 is located between the fixed side frame 10 and the gantry body so as to sandwich the moving path of the particle beam irradiation unit 4 (that is, a predetermined distance away from the fixed side frame 10). 2 is disposed on the other end side (left end in FIG. 2). The moving frame 20 is rotatably supported by a plurality of moving frame support rollers 26 mounted on a moving frame support base 25 (see FIGS. 3 and 4) fixed to the support frame 50 described above. The Therefore, the moving side frame 20 can be rotated relative to the gantry body 2 by these moving side frame support rollers 26. Further, a moving frame driving device 23 is fixed to the inner surface of the end portion (left end in FIG. 2) of the gantry body 2. That is, the moving side frame driving device 23 synchronizes the moving side frame 20 with the rotation of the gantry body 2 via the moving side frame driving roller 24, and is the same in the opposite direction to the rotation of the gantry body 2. Thus, the absolute position of the moving frame 20, that is, the relative position (phase) with respect to the fixed frame 10 is kept the same.

  A rear panel 22 that closes the depth side of the irradiation room 43 for particle beam therapy is fixed to the moving side frame 20. The rear panel 22, together with the moving side moving floor guide portion 21, is laser-type. A signal generator 33 is held. The moving side moving floor guide portion 21 is a horizontal guide groove, and is thus kept in the same horizontal plane with respect to the horizontal guide groove of the above-mentioned bowl (semicircle) -shaped fixed side moving floor guide portion 11. I'm leaning.

  In addition, about the other code | symbol in these figures, 40 has shown the treatment table, 41 has shown the patient, 42 has shown the building.

  Next, as shown in FIG. 7 (enlarged cross-sectional view of part C in FIG. 4), the movable floor 30 has a large number of plate-like members 38, and the adjacent plate-like members 38 are linked to each other. It is connected by, and it has a continuous structure that can be freely bent. Each plate-like member 38 is arranged in parallel to the rotation axis direction of the rotating gantry 1 (that is, along the rotation axis direction), and one end of the plate-like member 38 is always aligned with the guide groove of the fixed side moving floor guide portion 11. On the other hand, the other end basically engages with the guide groove of the moving side moving floor guide portion 21 or the guide groove of the trunk side moving floor guide portion 51, however, There are also portions that are not engaged in some of them.

  The detailed structure of the moving floor 30 will be further described with reference to the attached FIG. 5 (an enlarged view shown in part A of FIG. 2 including a front view and a side view). That is, each plate-like member 38 constituting the moving floor 30 has a moving floor wheel 31 attached to one side surface thereof, and when the moving floor 30 moves, the moving floor wheel 31 moves to the moving side moving floor guide. It is inserted into the guide groove of the part 21. Although not shown here, a moving floor wheel 31 is similarly attached to the opposite end side surface of the moving side moving floor guide portion 21, and the wheel is connected to the fixed side moving floor guide portion 11. Is inserted into the guide groove.

  Each plate-like member 38 has a signal light receiving portion 34 on the surface facing the treatment space formed by the movable floor 30 and the like, and a hanging device on the surface facing the inner surface of the gantry body 2 on the opposite side. 32 is fixed. The hanging device 32 is provided with a hanging pin 35 that can be taken in and out, and the hanging pin 35 is taken in and out each time an optical signal is incident on the signal light receiving unit 34. In addition, when the hanging pin 35 has come out, as shown in FIG. 6 (enlarged sectional view of the B portion in FIG. 3), the hanging pin 35 is inserted into the guide groove of the trunk side movable floor guide portion 51 and Become.

  Next, with reference to FIG. 7 again, a delivery method at one end portion of the moving floor 30, particularly at the engaging portion between the moving side moving floor guide portion 21 and the trunk side moving floor guide portion 51 will be described. explain. That is, when one end portion of the plate-like member 38 is engaged with the moving side moving floor guide portion 21, the hanging pin 35 is accommodated in the hanging device 32 as described above. When the moving floor 30 moves with the rotation of the gantry body 2, the plate-like member 38 that has been engaged with the moving-side moving floor guide portion 21 is disengaged from the engaged state with the moving-side moving floor guide portion 21. Become. Thereafter, when the moving floor 30 further moves, the hanging device 32 gradually enters the gaps between the guides that constitute the body-side moving floor guide portion 51 and that face each other. The laser signal generator 33 is placed at a predetermined position on the rear panel 22 so as to send an optical signal to the signal light receiving unit 34 at a position where the hanging pin 35 can enter the guide groove of the trunk side movable floor guide unit 51. Installed and arranged.

  More specifically, for example, when the laser signal generator 33 is set so as to always emit an optical signal while the gantry body 2 is rotating, the hanging pin 35 is placed in the hanging device 32. The plate-like member 38 in the accommodated state enters the guide groove of the trunk-side movable floor guide portion 51, protrudes the hanging pin 35 at the position indicated by the broken-line arrow in the drawing, and has one end portion of the plate-like member 38. The body side moving floor guide 51 is engaged. On the other hand, the plate-like member 38 which has received the optical signal from the laser signal generator 33 with the signal light receiving unit 34 with the hanging pin 35 protruding, accommodates the hanging pin 35 in the hanging device 32, Thus, the engagement between the one end portion of the plate-like member 38 and the body-side moving floor guide portion 51 is released.

  As described above, one part of the plate-like member 38 is not engaged with the guide groove of the moving side moving floor guide part 21 or the guide groove of the body side moving floor guide part 51. There are places. However, even in such a case, the other end is engaged with the fixed-side moving floor guide portion, and the moving floor 30 is bent by connecting adjacent plate-like members 38 with links 36. Since it has a freely connected structure, the hanging pin 35 is smoothly inserted into the trunk-side moving floor guide portion 51. However, as a means for more reliably inserting, for example, the trunk-side moving floor guide portion 51 is used. It is also possible to reduce the inner diameter of the plate member, or to provide a stopper between the adjacent plate-like members 38 to make it difficult to bend (limit the bend between the adjacent plate-like members 38).

  In addition, by appropriately installing the laser signal generator 33 on the rear panel 22, the on / off of the coupling (connection) relationship between the moving floor 30 and the fuselage-side moving floor guide portion 51 is appropriately controlled. From this, one end of the moving floor 30 can be freely transferred between the moving side moving floor guide part 21 and the trunk side moving floor guide part 51. It becomes.

  That is, according to the medical particle beam irradiation apparatus according to the present invention, the detailed structure of which has been described above, as is clear by comparison with the comparative examples of FIGS. 8 and 9, the inside of the gantry body 2 is clearly shown. The space formed by the moving floor 30 and the like can be made larger than the conventional structure. More specifically, for example, as in the comparative examples of FIGS. 8 and 9, the moving side moving floor guide portion 21 fixed to the rear panel 22 has a so-called bowl shape (semicircle) having a horizontal portion below the moving side moving floor guide portion 21. Compared to a structure in which the moving floor 30 is stretched between the moving side moving floor guide portion 21 and the fixed side moving floor guide portion 11, the inner circumference of the gantry body 2 is obtained according to the configuration of the present invention. Since the body side moving floor guide 51 is provided directly on the surface as a moving floor guide, the gap between the moving floor 30 and the inner surface of the gantry body 2 can be made extremely small. In other words, in order to obtain the empty space 44 around the moving side frame together with the irradiation room 43 for particle beam therapy having the same size as the embodiment of the present invention in the above-described conventional structure, from the structure, the gantry body In contrast, in the present invention, since the gantry body 2 has a structure in which the body-side moving floor guide portion 51 is provided directly on the gantry body 2, the inside of the moving bed 30 and the gantry body 2 is provided. The gap between the peripheral surface can be made as small as possible. Therefore, regardless of the size of the empty space 44 around the moving side frame, in the case where the irradiation room 43 for particle beam treatment of the same degree is formed, it is necessary to increase the diameter of the gantry body 2 as compared with the above comparative example. Therefore, it is possible to achieve downsizing of the apparatus.

  In particular, according to the fact that it is possible to sufficiently secure the area of the empty space 44 around the moving side frame together with the irradiation room 43 for particle beam therapy having a larger area, Even if a large particle beam irradiation unit to which a multi-leaf collimator as disclosed in Japanese Patent Application Laid-Open No. 2001-353228 is applied is employed, a sufficient space can be secured around the driving unit. Using the means, the position is individually adjusted, and the operation for setting the irradiation range becomes easy. In this case, the particle beam irradiation unit can move in conjunction with the rotation of the gantry body 2, and on the other hand, the three guide units (that is, the fixed side moving bed guide unit 11, the moving side moving bed). Regardless of the rotational position of the particle beam irradiation unit, the moving bed 30 formed so as to be movable by the guide unit 21 and the trunk side moving floor guide unit 51) is always moved in conjunction with the rotation of the gantry trunk 2 regardless of the rotational position of the particle beam irradiation unit. The irradiation room 43 for particle beam therapy that can keep the moving bed 30 in parallel can be realized.

  As described above, according to the first embodiment of the present invention, it is possible to secure a further empty space around the particle beam irradiation unit without depending on the rotation position of the particle beam irradiation apparatus, and Miniaturization can be achieved at the same time, so that 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.

  FIG. 10 is a longitudinal sectional view showing the detailed structure of the main part of the irradiation room for particle beam therapy, in particular, of the medical particle beam irradiation apparatus according to the second embodiment of the present invention. It is the cross-sectional view which looked at the rotation gantry shown in FIG. 10 from the YY direction. 12 is a cross-sectional view of the rotating gantry shown in FIGS. 10 and 11 as seen from the Z-Z direction, and FIG. 13 is a diagram showing the detailed structure of the moving bed shown in part D of FIG. FIG. 14 is an explanatory diagram for explaining the movement of the moving floor within the fixed-side moving floor guide section in the section E of FIG. In the following description, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  In the second embodiment, as in the first embodiment described above, the fixed-side moving floor guide portion 11, the moving-side moving floor guide portion 21, and the fuselage-side moving floor attached to the inner peripheral surface of the gantry fuselage 2 are used. The plate-like member 38 constituting the movable floor 30 is movable with respect to the three guide portions of the guide portion 51. However, in the second embodiment, the above-described first embodiment enables the movable floor 30 to be moved by engaging the guide portion by the action of the hanging device 32 and the hanging pin 35 attached to the plate member 38. In other words, in the second embodiment, in particular, the structures of the trunk side moving floor guide 51, the moving floor 30, and the fixed side moving floor guide 11 are changed. That is, the rotational axis direction of the gantry body 2 between the moving side moving floor guide part 21 and the body side moving floor guide part 51 attached to the inner peripheral surface of the gantry body 2 with the plate-like member 38 constituting the moving floor 30. And the engagement portion is delivered.

  First, with respect to the fuselage-side movable floor guide 51, the guide groove is installed in the support frame 50 so as to face the rotation axis direction of the gantry fuselage 2, while the engagement structure with the movable floor 30 is moved. Similar to the side moving floor guide portion 21, a structure is adopted in which one end portion of each plate-like member 38 including the moving floor wheel 31 is inserted into the guide groove.

  Next, with respect to the moving floor 30, the adjacent plate-like members 38 are connected to each other so as to be bendable, and each plate-like member 38 is a mechanism that can slide in the direction of the rotation axis of the gantry body 2, so As shown in FIG. 13, adjacent plate-like members 38 are fixed to each other by a moving floor connecting portion 61. That is, the moving floor connecting portion 61 is configured by a slide rod 61a and a cylindrical slide rod receiving portion 61b. When the slide rod 61a is inserted into the cylindrical slide rod receiving portion 61b, each is adjacent to each other. It arrange | positions so that it may face the side surface of the plate-shaped member 38 to do. As a result, the adjacent plate-like members 38 are connected to each other so that they can be bent, so that each plate-like member 38 can individually slide in the direction of the rotation axis of the gantry body 2.

  In addition, in order to actually slide the movable floor 30 in the direction of the rotation axis of the gantry body 2, together with the fixed-side movable floor guide portion 11, an engaging portion between the fixed-side movable floor guide portion 11 and the movable floor 30 is provided. It must be devised. Specifically, in the second embodiment, as shown in the attached FIGS. 13 and 14, a spring-equipped slide device 62 is fixed to the end face of each plate-like member 38 constituting the movable floor 30. On the other hand, the fixed-side moving floor guide portion 11 is provided with a fixed-side moving floor sliding portion 12 having an inclination (see FIG. 14), and the slide device 62 is always installed. It arrange | positions so that the fixed side moving floor guide part 11 may be engaged.

  Here, as shown in FIG. 13, the spring-equipped sliding device 62 includes a spacing holding rod 62a, a guide groove sliding portion 62b, a pulling spring 62c, and a stopper 62d. The spacing holding rod 62a Thus, the movable floor wheel 31 and the fixed-side moving floor sliding portion 12 do not come into contact with each other while the moving floor 30 is moving, in other words, a fixed distance between the moving floor wheel 31 and the fixed-side moving floor sliding portion 12. Is configured to be maintained. Further, the guide groove sliding portion 62b and the stop portion 62d are placed between the fixed-side moving floor sliding portion 12 so that each plate member 38 performs a predetermined sliding motion along the fixed-side moving floor sliding portion 12. They are arranged and connected between them by a tension spring 62c through a gap formed in the fixed side moving floor sliding portion 12.

  Further, in order for each plate-like member 38 to slide smoothly, it is necessary to orient (tilt) the moving floor wheel 31 during the sliding in the traveling direction as shown in FIG. In this example, each plate-like member 38 and the movable floor wheel 31 are fixed using, for example, the universal joint shaft 37, so that each plate-like member 38 always faces the rotation axis direction of the gantry body 2, and It is possible to incline along the sliding portion 12, that is, to align the direction of the moving floor wheel 31 with the traveling direction of the plate-like member 38. In addition, the movable region of the universal joint shaft 37 restricts the change angle in the traveling direction of the plate-like member 38 (that is, the inclination angle of the sliding portion 12).

  The body-side moving floor guide portion 51 is provided for the delivery of the engaging portion from the moving-side moving floor guide portion 21 to the body-side moving floor guide portion 51 at the end of each plate-like member 38 constituting the moving floor 30. It is possible to deliver more surely and smoothly by reducing the inner diameter of the plate or by providing a stopper between the adjacent plates 38 so as not to bend over a certain angle. It is the same. That is, the medical particle beam irradiation apparatus according to the second embodiment described above depends on the same effect as the first embodiment of the present invention, that is, the rotational position of the particle beam irradiation apparatus. In addition, it is possible to secure a further empty space around the particle beam irradiation unit and simultaneously reduce the size of the rotating gantry body, thereby realizing an excellent medical particle beam irradiation device including workability. Is possible.

  That is, according to the medical particle beam irradiation apparatus according to the present invention, the guide provided for forming the moving bed is a movement provided on the moving side frame that maintains the positional relationship opposite to the fixed side frame even when the rotating gantry rotates. A side moving floor guide part, a body side moving floor guide part provided in a gantry body that rotates and moves the rotating gantry, and a fixed side moving floor guide part provided in a fixed side frame are used. The fixed-side moving floor guide portion is a saddle (semicircle) type guide groove having a horizontal portion on the lower side, and the moving-side moving floor guide portion is a horizontal guide groove. Moreover, the horizontal part of both guide parts shall be maintained in the same horizontal plane. Further, the trunk-side moving floor guide portion is provided on the entire circumference or a part of the circumference that is relatively close to the inner circumference of the gantry trunk. In the moving side moving floor guide part and the fuselage side moving floor guide part, there is no guide that becomes a part of the moving floor passage, however, by providing a delivery mechanism in the moving floor or the fixed side moving floor guide part on the opposite side. It becomes possible to deliver on the guide of the moving floor.

  In this way, a gap is provided between the moving side frame and the rotating gantry body by reducing the size of the moving side frame as compared with the inner diameter of the rotating gantry body. The support frame fixed to the gantry body that supports the moving side frame is provided on the inner periphery of the rotating gantry body excluding the vicinity of the particle beam irradiation unit.

  From the above, the rotation irradiation chamber for particle beam treatment is formed by securing a further empty space around the particle beam irradiation unit at all rotation angles of the rotating gantry and using a guide relatively close to the inner periphery of the rotating gantry body. Thus, even when the size of the rotary irradiation chamber for particle beam therapy in the prior art is the same, the size of the rotating gantry body can be reduced.

1 is a perspective view showing a medical particle beam irradiation apparatus according to a first embodiment of the present invention, particularly focusing on a rotating gantry. FIG. It is a longitudinal cross-sectional 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. FIG. 5 is a cross-sectional view of the rotating gantry viewed from the VV direction in FIG. 2. It is a longitudinal cross-sectional view of the rotating gantry seen from the WW direction in the said FIG.2 and FIG.3. It is the front and side view which expand and show the detailed structure of the moving floor of the A section in the said FIG. It is sectional drawing which expands and shows the B section in the said FIG. It is an expanded sectional view which shows the detail of the C section in the said FIG. It is a longitudinal cross-sectional view which shows the structure of the irradiation chamber for particle beam therapy containing the conventional rotating gantry for the comparison with this invention. Similarly, for comparison with the present invention, it is a cross-sectional view showing the structure of an irradiation chamber for particle beam therapy including a conventional rotating gantry. It is a longitudinal cross-sectional view showing the principal part detailed structure of the medical particle beam irradiation apparatus which becomes the 2nd Embodiment of this invention, especially the irradiation room for particle beam therapy of a rotating gantry. It is the cross-sectional view which looked at the rotation gantry from the YY direction in the said FIG. It is the cross-sectional view which looked at the rotating gantry from the ZZ direction in the said FIG. It is a detailed structure perspective view of the movable floor which expands and shows the D section in the above-mentioned FIG. It is operation | movement explanatory drawing which shows the motion of the movable floor within the fixed side movable floor guide part of the E section in the said FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotary gantry, 2 ... Gantry fuselage, 3 ... Front ring, 4 ... Particle beam irradiation part, 5 ... Beam transport apparatus, 6 ... Support roll, 7 ... Gantry rotation motor, 8 ... Rear ring, 10 ... Fixed side frame, DESCRIPTION OF SYMBOLS 11 ... Fixed side moving floor guide part, 12 ... Fixed side moving floor sliding part, 20 ... Moving side frame, 21 ... Moving side moving floor guide part, 22 ... Rear panel, 23 ... Moving side frame drive device, 24 ... Moving side Frame driving roller, 25 ... moving side frame support base, 26 ... moving side frame supporting roller, 30 ... moving floor, 31 ... moving floor wheel, 32 ... hanging device, 33 ... laser type signal generator, 34 ... signal light receiving unit, 35 ... Hanging pin, 36 ... Link, 37 ... Universal joint shaft, 38 ... Plate member, 40 ... Treatment table, 41 ... Patient, 42 ... Building, 43 ... Particle beam therapy Irradiation chamber, 44: Empty space around the moving side frame, 50 ... Support frame, 51 ... Body side moving floor guide part, 61 ... Moving floor connecting part, 61a ... Slide rod, 61b ... Cylindrical slide rod receiving part, 62 ... Spring With sliding device, 62a ... spacing rod, 62b ... guide groove sliding part, 62c ... tension spring, 62d ... stop part

Claims (10)

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 moving frame that is relatively rotatably supported inside the rotating gantry, and attached to the moving frame. A moving side moving floor guide part, a fixed side frame disposed and fixed facing the moving side frame in the rotating gantry, a fixed side moving floor guide part fixed to the fixed side frame, and one end And a movable floor that is movably attached to the movable-side movable floor guide portion and is engaged with the other end of the fixed-side movable floor guide portion so as to be movable, and for rotating the rotating gantry. Nevertheless, in a medical particle beam irradiation apparatus that forms a space for particle beam therapy by maintaining the lower side of the moving bed substantially horizontal,
A fuselage-side moving floor guide portion is directly attached on the inner peripheral surface of the rotating gantry, and at a predetermined position in the rotating gantry, engagement of one end of the moving bed with the moving-side moving floor guide portion is performed. A medical particle beam irradiation apparatus comprising means for delivering from the moving side moving floor guide part to the trunk side moving floor guide part.   2. The medical particle beam irradiation apparatus according to claim 1, wherein the delivery means includes a pin that can be taken in and out, and the groove of the moving side moving floor guide portion or the groove of the trunk side moving floor guide portion. A medical particle beam irradiation apparatus comprising: a hanging device that can be engaged with each other; and a means for controlling insertion and removal of pins of the hanging device.   3. The medical particle beam irradiation apparatus according to claim 2, wherein the means for controlling insertion / removal of the pins of the hanging apparatus irradiates the moving bed with a light control signal at a predetermined position in the rotating gantry. Thus, the medical particle beam irradiation apparatus is configured to control the insertion and removal of the pins of the hanging apparatus.   4. The medical particle beam irradiation apparatus according to claim 3, wherein the means for irradiating the light control signal is a laser light generating means.   The medical particle beam irradiation apparatus according to claim 1, wherein a plate-like member constituting the moving bed is used as the rotating gantry as means for delivering from the moving side moving floor guide portion to the trunk side moving floor guide portion. A particle beam irradiation apparatus for medical use characterized in that it can be moved in the direction of the rotation axis.   6. The medical particle beam irradiation apparatus according to claim 5, further comprising a slide device attached to a plate-like member constituting the movable floor, the slide device being connected to the movable side movable floor guide portion and the trunk side movable floor guide. A medical particle beam irradiation apparatus characterized in that a plate-like member is moved by providing a sliding portion formed in a section and moving the slide device along the sliding portion.   The medical particle beam irradiation apparatus according to claim 6, wherein the sliding portion formed on the trunk side moving floor guide portion includes an inclined portion at a predetermined position in the rotating gantry. Medical particle beam irradiation device.   The medical particle beam irradiation apparatus according to claim 6, wherein each plate-like member constituting the moving bed includes a wheel, and the moving bed wheel can be inclined in a traveling direction. A medical particle beam irradiation apparatus characterized by the above.   The medical particle beam irradiation apparatus according to any one of claims 1 to 8, wherein the moving frame rotates in the direction opposite to the rotation direction in synchronization with the rotation of the rotating gantry. Particle beam irradiation equipment.   The medical particle beam irradiation apparatus according to any one of claims 1 to 8, wherein the moving bed is composed of a plurality of plate-like members, and a stopper for limiting the bending of the adjacent plate-like members. A medical particle beam irradiation apparatus comprising:

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