JP4185637B2 - Rotating irradiation chamber for particle beam therapy - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a rotary irradiation chamber for particle beam therapy, and more particularly to the technical field of a rotary irradiation chamber for particle beam therapy that has a simple structure and is easy to operate.
[0002]
[Prior art]
As is well known, X-rays, gamma rays, electron beams, neutron beams and the like have been conventionally used for cancer treatment. However, in recent years, a heavy particle beam such as carbon has attracted attention because it can irradiate only the affected area intensively and has little adverse effect on normal cells around the affected area. The construction of a particle beam therapy facility is being promoted. The configuration of such a particle beam therapy facility is substantially the same as that of a rotary irradiation chamber for radiotherapy disclosed in, for example, JP-A-11-47287.
[0003]
Hereinafter, the outline of the rotary irradiation chamber for radiotherapy according to the above-described conventional example will be described with the same name and the same reference numerals described in the publication with reference to FIG. Then, regardless of the rotation position of the radiation irradiation unit that irradiates the cancer patient, the horizontal access floor (moving floor) is always placed under the treatment bed, covering the inside of the rotation irradiation chamber. By making it possible to form, it is intended to give a sense of security to cancer patients. More specifically, a fixed-side ring rail 62 and a moving-side ring rail 72 arranged across the movement path of the radiation irradiation unit 22 form a kamaboko-shaped passage 80 having a horizontal lower side, and the passage 80 is formed in the passage 80. A continuous moving floor 82 made up of a large number of plates flexibly connected by links is arranged, and the moving floor 82 is moved in synchronization with the rotation of the radiation irradiating section 22 and the moving side ring rail 72 is moved. It is configured to move by the same amount in the opposite direction to the floor 82.
[0004]
In the rotary irradiation chamber for radiation therapy according to the conventional example having the above-described configuration, as described above, when the moving floor 82 moves in synchronization with the rotation of the radiation irradiation unit 22, the moving-side ring rail 72 is opposite to the moving bed 82. Are configured to move by the same amount. Therefore, according to the rotary irradiation chamber for radiotherapy according to this conventional example, the moving ring rail 72 is kept stationary, so that the lower part of the moving floor 82 is under the rotation regardless of the rotation of the radiation irradiation unit 22. You can keep the sides horizontal.
When an error occurs between the moving amount of the moving floor 82 and the moving amount of the moving ring rail 72, the error of the moving amount is corrected.
[0005]
[Problems to be solved by the invention]
The rotary irradiation chamber for radiotherapy according to the above-described conventional example is considered to be extremely useful because the lower side of the moving bed is always held horizontally regardless of the rotation position of the radiation irradiation unit. However, in the case of the rotary irradiation chamber for radiation therapy according to this conventional example, as described above, the moving side ring rail is configured to move in the same direction in the opposite direction to the moving bed in synchronization with the radiation irradiation unit. In addition to the driving means for moving the same amount in the reverse direction in synchronization with the rotation, a correction means for correcting an error in the movement amount is necessary, so that the configuration is complicated and operation is difficult. In other words, although there is a strong demand for a rotary irradiation chamber for radiation therapy that is cheaper and easier to operate, it must be expensive, and in addition to being economically disadvantageous, it is difficult to operate. There are issues to be solved.
[0006]
Therefore, an object of the present invention is to provide a driving means for moving the rotating drum side ring rail in the same direction in the opposite direction to the moving floor without providing a driving means, so that the rotating drum side ring rail can be kept stationary. The object of the present invention is to provide a rotary irradiation chamber for particle beam therapy which is simple in construction and easy to operate.
[0007]
[Means for Solving the Problems]
According to the present invention, if the configuration is such that the rotating drum side guide rail can be kept stationary regardless of the rotational position of the rotating drum, the rotating drum side ring rail is synchronized with the moving bed in the opposite direction by the same amount. It is no longer necessary to provide a driving means to move and a correction means to correct the error of the movement amount, and the configuration of the rotary irradiation chamber for particle beam therapy is simplified and the operation is facilitated. It is.
[0008]
Therefore, in order to solve the above-mentioned problems, the feature of the means adopted by the rotary irradiation chamber for particle beam therapy according to claim 1 of the present invention is that it is fixed to a fixed cylinder in which a treatment bed is disposed. A torso-side guide rail is provided, a rotating torso that supports a particle beam irradiation unit that rotates around the patient on the treatment bed is disposed, and the rotating torso-side guide rail is provided inside the rotating torso A rail support cylinder is provided, and the fixed cylinder side and the rotary cylinder side guide rails are arranged such that the lower side is horizontal and an irradiation chamber is formed on the inner side together with the fixed cylinder and the guide rail support cylinder. In a rotary irradiation chamber for particle beam therapy, in which a bendable endless moving bed that operates in synchronization with the rotation of the particle beam is supported, an engaging portion is provided on the guide rail support cylinder side, and the engagement is provided on the fixed cylinder side. Separation at the joint There a guide rail supporting body at which is provided a locking means for the still engaged with the stationary.
[0009]
The feature of the means adopted by the rotary irradiation chamber for particle beam therapy according to claim 2 of the present invention is that, in the rotary irradiation chamber for particle beam therapy according to claim 1, the engaging portion is an engagement hole. The locking means is a telescopic device that inserts and removes the locking rod into the engagement hole.
[0010]
The feature of the means adopted by the rotary irradiation chamber for particle beam therapy according to claim 3 of the present invention is that, in the rotary irradiation chamber for particle beam therapy according to claim 2, the engagement hole and the locking A telescopic device for inserting and removing the rod is provided on both sides in the rotational direction of the particle beam irradiation unit.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the rotary irradiation chamber for particle beam therapy according to Embodiment 1 of the present invention is shown in FIG. 1 in a longitudinal sectional view of the main part thereof, in FIG. FIG. 2B is a cross-sectional view taken along the line B-B of FIG. 2, FIG. 3 is a cross-sectional view of the moving floor and the guide rail support cylinder, and FIG. 4 will be described with reference to FIG. 4 in FIG. 5, FIG. 5A in an enlarged cross-sectional view of a C portion in FIG. 3, and FIG. 5B in FIG.
[0012]
Reference numeral 1 shown in FIGS. 1 and 3 to 4 denotes a rotating irradiation chamber for particle beam therapy according to the first embodiment. The rotary irradiation chamber 1 for particle beam therapy is mainly supported at one end side by a wall 100 of the building and includes a fixed cylinder 2 having a treatment bed 2c therein, a rotary cylinder 4 that supports the particle beam irradiation unit 3, and A guide rail support drum 5 disposed on the inner side of the rotary drum 4 and on the fixed drum 2 side, and disposed between the fixed drum 2 and the guide rail support drum 5 and penetrating through the upper part. The particle beam irradiating unit 3 is configured to move freely in accordance with the rotation of the particle beam irradiating unit 3.
[0013]
More specifically, a guide rail 2b is laid along the longitudinal direction of the fixed cylinder 2 on a horizontal floor inside the fixed cylinder 2, and the treatment bed is guided by the guide rail 2b. 2c is reciprocated. Further, at the end of the fixed barrel 2 on the guide rail support barrel 5 side, the lower side is horizontal, the upper side has an arc portion, and the guide rail support barrel 5 side has an opening. A fixed body side guide rail (corresponding to a fixed side ring rail of a conventional example) 2a having a vertical cross section in a letter shape is provided.
[0014]
Around the outer periphery of the guide rail support cylinder 5, a guide rail support cylinder support member 5b provided with a plurality of support rollers 5c that roll on the inner peripheral surface of the rotary cylinder 4 is provided around the guide rail support cylinder 5. On the outer periphery of the end portion of the barrel 5, a rotary barrel side guide rail (corresponding to the moving side ring rail of the conventional example) formed in the same shape as the fixed barrel side guide rail 2 a having an opening on the fixed barrel 2 side. ) 5a is provided. In addition, on the fixed barrel 2 side of the guide rail support barrel support member 5b, engagement holes 5d as engagement portions are provided on both sides in the rotation direction of the particle beam irradiation unit 3. The engagement holes 5d and 5d are circular, but may be irregular.
[0015]
Further, as shown in FIGS. 1 and 4, a rotary drum support ring 4a is provided on the outer periphery of the end portion of the rotary drum 4 fitted to the fixed drum 2, and the rotary drum support ring 4a The outer peripheral surface is supported by two support rollers 4b provided on a gantry, and the two support rollers 4b are configured so that the rotating drum 4 can be smoothly rotated. .
[0016]
The fixed cylinder side guide rail 2a and the rotating cylinder side guide rail 5a support an endless moving floor 6 having a horizontal structure on the lower side and an arc portion on the upper side. As shown in FIGS. 5 (a) and 5 (b), the movable floor 6 includes a rubber belt 6a having a predetermined thickness that forms a floor surface, and the fixed body side guide rail 2a and the rotating body side guide on both ends. A carrier 6b comprising a rubber support beam member 6c having a rectangular longitudinal section provided with guide rollers 6d and 6d that are fitted to the rail 5a and rolls is an outer peripheral surface of the rubber belt 6a, and this rubber belt. 6a is fixed in the circumferential direction at a predetermined interval. That is, the carrier 6b is configured so that the movable floor 6 can be guided and moved by the fixed trunk side guide rail 2a and the rotary trunk side guide rail 5a and can support the weight of the human body. Yes.
[0017]
Further, as shown in FIGS. 2 (a) and 2 (b), a cylinder mounting base 7b is provided at the upper portion of the fixed barrel 2, and each of the engagement holes 5d and 5d is provided in the cylinder mounting base 7b. A rod actuating electric cylinder 7 which is an expansion / contraction device for extending / contracting a locking rod 7a which is detachably engaged with the rod is attached. The locking rod 7a is attached to two linear ways 7d which are guided by a linear rail 7c provided on the side of the cylinder mounting base 7b and reciprocally move. The locking rod 7a is engaged with the engaging rod 7a. Even if the rotating drum 4 is rotated to rotate the particle beam irradiation unit 3 while maintaining the straight state even when engaged with the hole 5d, the guide rail supporting drum 5 remains stationary at a fixed position. Can be done.
[0018]
By the way, the engagement holes 5d are provided at both positions in the rotational direction of the particle beam irradiation unit 3, and the rod operation for extending and retracting the engagement rods 7a that are removably engaged with the engagement holes 5d and 5d, respectively. The electric cylinder 7 is provided because the locking rod 7a on the side that hinders the rotation of the particle beam irradiation unit 3 is reduced and pulled out from the engaging hole 5d, while the other locking rod 7a is used to guide the guide rail support cylinder 5. It is a consideration to make the stand still. That is, the guide rail support body 5 is configured to be stationary by any one of the locking rods 7a.
[0019]
Hereinafter, the usage mode of the rotary irradiation chamber 1 for particle beam therapy according to the first embodiment will be described. For example, when the particle beam irradiation unit 3 is rotated in the left direction in FIG. The cylinder 7 is reduced and the locking rod 7a is extracted from the engagement hole 5d, and the telescopic rod of the right rod operating electric cylinder 7 is extended to insert the locking rod 7a into the engagement hole 5d.
[0020]
The moving bed 6 moves in the left direction in synchronism with the rotation in the left direction of the particle beam irradiation unit 3, and the guide is acted by the action of the locking rod 7a inserted in the right engagement hole 5d. The rail support drum 5 is stationary, that is, the rotary drum side guide rail 5a is kept stationary. Therefore, regardless of the rotational position of the particle beam irradiation unit 3, the lower side of the moving bed 6 is maintained in a horizontal state. Of course, when the particle beam irradiation unit 3 is rotated in the right direction in FIG. 3, contrary to the above, the locking rod 7a is extracted from the right engagement hole 5d and is locked in the left engagement hole 5d. What is necessary is just to insert the rod 7a.
[0021]
According to the rotary irradiation chamber 1 for particle beam therapy according to the first embodiment, as described above, the rotating trunk side guide rail 5a is opposite to the moving bed 6 as in the rotary irradiation chamber for radiation therapy according to the conventional example. There is no need to provide drive means for synchronous movement in the direction by the same amount. Accordingly, when an error occurs between the moving amount of the moving floor and the moving amount of the moving ring rail, it is not necessary to perform difficult drive control such as correcting the error of the moving amount. The structure of the rotary irradiation chamber 1 is much simpler than that of the conventional rotary irradiation chamber for radiotherapy, and it is advantageous in terms of the price of the rotary irradiation chamber 1 for particle beam therapy and its operation is also easy. An excellent effect can be achieved.
[0022]
Next, a rotary irradiation chamber for particle beam therapy according to Embodiment 2 of the present invention will be described.
However, the difference between the rotary irradiation chamber for particle beam therapy according to the second embodiment and the rotary irradiation chamber for particle beam therapy according to the first embodiment is the difference in the configuration of the moving bed. Is the same configuration, so FIG. 6 (a) of the partial plan view of the moving floor, FIG. 6 (b) of the E arrow view of FIG. 6 (a), and F arrow of FIG. 6 (b). Only the differences will be described below with reference to FIG. 6C.
[0023]
Reference numeral 8 shown in the figure is a moving bed of the rotary irradiation chamber for particle beam therapy according to the second embodiment. The moving floor 8 is orthogonal to the link plate 8b on the surface of the link plate 8b forming the floor surface and the both ends of the longitudinal direction of the link plate 8b (corresponding to the width direction of the moving floor 8). A roller mounting member 8c composed of two plate members projecting in a direction to be connected to each other and a beam member connecting them, and the two plate members of these roller mounting members 8c are rotatably mounted on each of the plate members, A plurality of carriers 8a composed of guide rollers 8d, 8d that fit and roll on the fixed body side guide rail 2a and the rotating body side guide rail 5a are connected endlessly by a plurality of hinge pins 8e. It is constituted by.
[0024]
Thus, in the particle beam therapy rotating irradiation chamber according to the second embodiment, the configuration of the moving bed 8 is only different from the configuration of the moving bed 6 of the particle beam therapy rotating irradiation chamber according to the first embodiment. Therefore, the rotary irradiation chamber for particle beam therapy according to the second embodiment is equivalent to the rotary irradiation chamber for particle beam therapy according to the first embodiment.
[0025]
By the way, in the case of the rotary irradiation chamber for particle beam therapy according to the first or second embodiment, as described above, the two rod operating electric cylinders are disposed on the upper side of the fixed barrel. However, these rod operating electric cylinders can be arranged on the lower side of the fixed cylinder. However, when the rod operating electric cylinder is disposed on the lower side of the fixed cylinder, the maintenance work is slightly disadvantageous than when the rod operating electric cylinder is disposed on the upper side of the fixed cylinder.
[0026]
Further, even if the rod operating electric cylinder is replaced with a hydraulic cylinder having a well-known configuration, it also comprises a motor, a ball screw reversibly rotated by the motor, and a locking rod reciprocated by the ball screw. Even if it comprises, since the function equivalent to the electric cylinder for rod actuation can be exhibited, the range of the technical idea of the present invention is not limited by the above-mentioned Embodiment 1 or 2.
[0027]
【The invention's effect】
As described above, according to the rotary irradiation chamber for particle beam therapy according to claims 1 to 3 of the present invention, the locking rod is engaged with the engagement hole as the engagement portion by the telescopic device as the locking means. By doing so, the rotating drum side guide rail remains stationary regardless of the rotational position of the particle beam irradiation unit, so that the lower side of the moving bed can be maintained in a horizontal state. Therefore, unlike the conventional rotary irradiation chamber for radiotherapy, there is no need for a driving means for synchronously moving the rotating body side ring rail in the opposite direction to the moving bed, and the moving amount and the moving side of the moving bed are not required. Since it does not require difficult drive control such as correction when an error occurs with the amount of movement of the ring rail, the configuration of the rotary irradiation chamber for particle beam therapy is the same as that of the conventional rotary irradiation chamber for radiotherapy. There is a very good effect that it is simpler and cheaper than the configuration and easy to operate.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a rotary irradiation chamber for particle beam therapy according to a first embodiment of the present invention.
2A is a detailed view of a portion A in FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2A.
FIG. 3 is a diagram showing a cross section of the moving bed and guide rail support cylinder of the rotary irradiation chamber for particle beam therapy according to the first embodiment of the present invention.
FIG. 4 is a diagram showing a cross section of the moving bed of the rotary irradiation chamber for particle beam therapy according to Embodiment 1 of the present invention and a support state of the rotary drum.
5A and 5B relate to the first embodiment of the present invention, and FIG. 5A is an enlarged cross-sectional view of a portion C in FIG. 3, and FIG. 5B is a view taken in the direction of arrow D in FIG. .
6 (a) is a partial plan view of a moving floor according to Embodiment 2 of the present invention, FIG. 6 (b) is a view as viewed from the direction of arrow E in FIG. 6 (a), and FIG. 6 (c) is a view on arrow F in FIG. 6 (b).
FIG. 7 is a perspective view of a main part configuration of a rotary irradiation chamber for radiotherapy as viewed from an obliquely forward direction according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotary irradiation chamber for particle beam treatment 2 ... Fixed cylinder, 2a ... Fixed cylinder side guide rail (for moving beds), 2b ... Guide rail (for treatment bed), 2c ... Treatment bed 3 ... Particle beam irradiation part 4 Rotating drum 4a Rotating drum support ring 4b Support roller 5 Guide rail support drum 5a Rotating drum guide rail (for moving floor) 5b Guide rail support drum support member 5c Support roller 5d ... engaging hole 6 ... moving floor, 6a ... rubber belt, 6b ... carrier, 6c ... beam member, 6d ... guide roller 7 ... electric cylinder for rod operation, 7a ... locking rod, 7b ... cylinder mounting base, 7c ... linear rail , 7d ... Linear way 8 ... Moving floor, 8a ... Carrier, 8b ... Link plate, 8c ... Roller mounting member, 8d ... Guide roller, 8e ... Hinge pin 100 ... Building wall

Claims (3)

A fixed body side guide rail is provided in a fixed body having a treatment bed disposed therein, and a rotating body for supporting a particle beam irradiation unit rotating around the patient on the treatment bed is disposed. A guide rail support drum provided with a rotating drum side guide rail is provided inside the drum, and the lower side is horizontal by the fixed drum side and the rotating drum side guide rail, and the fixed drum and the guide rail are provided inside. In the rotary irradiation chamber for particle beam therapy, which forms an irradiation chamber together with a support cylinder and is supported by a bendable endless moving bed that operates in synchronization with the rotation of the particle beam irradiation unit, the guide rail support cylinder side A rotating irradiation chamber for particle beam therapy, wherein an engaging portion is provided on the fixed barrel side, and a locking means is provided on the fixed barrel side so as to be detachably engaged with the engaging portion so that the guide rail support barrel is stationary. 2. The rotary irradiation chamber for particle beam therapy according to claim 1, wherein the engaging portion is an engaging hole, and the locking means is a telescopic device that inserts and removes a locking rod into and from the engaging hole. The rotary irradiation chamber for particle beam therapy according to claim 2, wherein the engagement hole and a telescopic device for inserting and removing the locking rod are provided on both sides in the rotation direction of the particle beam irradiation unit. .

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