Aperture position detection device and medical accelerator treatment head

Abstract

The present invention discloses an aperture position detection device and a medical accelerator treatment head, which relate to the technical field of medical equipment, can adapt to high-dose irradiation, are not easily damaged, and have high detection accuracy. An aperture position detection device is used to detect the position information of an aperture that moves in an arc shape, and includes a connecting piece, a conversion mechanism, and a displacement sensor, wherein the connecting piece is fixed on the aperture, the input end of the conversion mechanism is connected to the connecting piece, when the connecting piece moves in an arc shape with the aperture, the conversion mechanism converts the arc motion of the connecting piece into a linear motion, and the displacement sensor is connected to the output end of the conversion mechanism, and is used to detect the displacement information of the linear motion of the output end of the conversion mechanism. The present invention is used to detect the aperture position.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to an aperture position detection device and a medical accelerator treatment head. Background Art

[0002] The aperture of the medical accelerator treatment head is driven by a motor, and the output dose of X-rays is controlled by opening and closing the aperture. Therefore, in order to accurately control the movement of the treatment head aperture, it is necessary to detect the specific position of the treatment head aperture in real time.

[0003] In order to reduce the radiation penumbra of X-rays, it is required that the inner surface of the aperture is tangent to the X-rays at any angle, so the aperture usually moves in an arc. In order to detect the position of the aperture that moves in an arc, an encoder is often used in the prior art. The encoder has a chip integrated inside that can convert the angular displacement into an electrical signal, thereby obtaining the position of the aperture.

[0004] However, the detection accuracy of the encoder itself is not high, and the X-ray measurement of the medical accelerator treatment head is large when it is working, which will cause great interference to the transmission of the chip signal inside the encoder, further reducing the accuracy of the detection. In addition, the chip is easily damaged when used under high-dose radiation for a long time. Summary of the invention

[0005] The embodiments of the present invention provide an aperture position detection device and a medical accelerator treatment head, which can adapt to large-dose irradiation, are not easily damaged, and have high detection accuracy.

[0006] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0007] On the one hand, an embodiment of the present invention provides an aperture position detection device for detecting position information of an aperture performing arc motion, comprising a connecting member, a conversion mechanism and a displacement sensor, wherein the connecting member is fixed on the aperture, and an input end of the conversion mechanism is connected to the connecting member. When the connecting member performs an arc motion with the aperture, the conversion mechanism converts the arc motion of the connecting member into a linear motion. The displacement sensor is connected to an output end of the conversion mechanism for detecting displacement information of the linear motion of the output end of the conversion mechanism.

[0008] Furthermore, the conversion mechanism includes a linear guide extending along a first direction and a sliding member that can slide along the linear guide, and the sliding member is provided with a first sliding groove and a second sliding groove along a second direction, and the end of the connecting member fits into the first sliding groove, the displacement sensor is connected to the second sliding groove, and the second direction is perpendicular to the first direction.

[0009] Further, the distance that the first sliding groove extends along the second direction is greater than or equal to the displacement of the connecting rod in the second direction when the connecting rod moves in an arc shape.

[0010] Furthermore, a bearing is sleeved on the end of the connecting portion, and an outer wall of the bearing abuts against an inner wall of the first sliding groove extending along the second direction.

[0011] Furthermore, the displacement sensor comprises a variable resistor slide rail and an extension shaft, the variable resistor slide rail extends along the second direction, a first end of the extension shaft can slide along the variable resistor slide rail, and a second end is connected to the second slide groove of the sliding member.

[0012] Furthermore, the conversion mechanism includes a connecting rod and a slider, one end of the connecting rod is hinged to the connecting member, and the other end is hinged to the slider, and the slider is connected to the displacement sensor.

[0013] The aperture position detection device of the embodiment of the present invention includes a connecting member, a conversion mechanism and a displacement sensor. The connecting member is fixed on the aperture and then moves in an arc shape with the aperture. The input end of the conversion mechanism is connected to the connecting member, and when the connecting member moves in an arc shape with the aperture, the conversion mechanism can convert the arc motion of the connecting member into a linear motion. Then, the displacement sensor connected to the output end of the conversion mechanism can directly detect the displacement information of the linear motion of the output end of the conversion mechanism. In this way, the position information of the aperture can be obtained through the displacement information detected by the displacement sensor, and the detection of the aperture position can be realized. Compared with the prior art, the arc motion of the aperture is converted into the linear motion of the output end of the conversion mechanism, and then the displacement sensor can be used to realize the detection. Among them, the basic principle of the displacement sensor is a sliding resistor, which does not contain components such as chips that are not resistant to X-ray irradiation, so it can adapt to large-dose irradiation and is not easy to be damaged. And the displacement sensor has high detection accuracy compared with the encoder.

[0014] On the other hand, an embodiment of the present invention further provides a medical accelerator treatment head, comprising at least one diaphragm, the diaphragm performing arc motion, and also comprising the above-mentioned diaphragm position detection device.

[0015] Furthermore, it also includes a motor, a rotating gear and an arc-shaped gear ring, wherein the rotating gear is connected to the aperture, and under the drive of the motor, the rotating gear can make an arc-shaped motion along the arc-shaped gear ring.

[0016] Furthermore, it also includes an arc-shaped ring gear mounting seat, and the arc-shaped ring gear is mounted on the arc-shaped ring gear mounting seat.

[0017] Furthermore, the linear guide of the aperture position detection device is fixed on the arc-shaped gear ring mounting seat.

[0018] The medical accelerator treatment head provided by the embodiment of the present invention has an aperture that moves in an arc shape. Therefore, after including the above-mentioned aperture position detection device, the position information of the aperture can be effectively detected, and it can adapt to large-dose irradiation, is not easy to be damaged, and has high detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments and the prior art description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic structural diagram of an aperture position detection device according to an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of Embodiment 1 of the aperture position detection device according to the embodiment of the present invention;

[0022] Figure 3 It is a partial structural diagram of the first embodiment of the aperture position detection device according to the embodiment of the present invention;

[0023] Figure 4 One of the three-dimensional structural schematic diagrams of the aperture position detection device in the embodiment of the present invention in the case of two apertures;

[0024] Figure 5 The second schematic diagram of the three-dimensional structure of the aperture position detection device in the embodiment of the present invention in the case of two apertures;

[0025] Figure 6 It is a structural schematic diagram of Embodiment 2 of the aperture position detection device according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 1-aperture; 2-connecting part; 3-conversion mechanism; 31-linear guide; 32-sliding part; 33-first slide groove; 34-second slide groove; 35-connecting rod; 36-sliding block; 37-slide rail structure; 4-displacement sensor; 41-variable resistor slide rail; 42-extending shaft; 5-bearing; 6-motor; 7-rotating gear; 8-arc gear ring; 9-arc gear ring mounting seat; 10-sensor mounting seat. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] On the one hand, the aperture position detection device provided by the embodiment of the present invention is as follows: Figure 1 and Figure 2 As shown, the aperture position detection device of the embodiment of the present invention is used to detect the position information of the aperture 1 performing arc motion, and includes a connecting member 2, a conversion mechanism 3 and a displacement sensor 4. The connecting member 2 is fixed on the aperture 1, and the input end of the conversion mechanism 3 is connected to the connecting member 2. When the connecting member 2 performs an arc motion along with the aperture 1, the conversion mechanism 3 converts the arc motion of the connecting member 2 into a linear motion. The displacement sensor 4 is connected to the output end of the conversion mechanism 3 and is used to detect the displacement information of the linear motion of the output end of the conversion mechanism 3.

[0032] The aperture position detection device of the embodiment of the present invention is as follows Figure 1 and Figure 2As shown, since it includes a connecting member 2, a conversion mechanism 3 and a displacement sensor 4, the connecting member 2 is fixed on the aperture 1, and then it will move in an arc shape with the aperture 1. The input end of the conversion mechanism 3 is connected to the connecting member 2, and when the connecting member 2 moves in an arc shape with the aperture 1, the conversion mechanism 3 can convert the arc motion of the connecting member 2 into a linear motion, and then the displacement sensor 4 connected to the output end of the conversion mechanism 3 can directly detect the displacement information of the linear motion of the output end of the conversion mechanism 3. In this way, the position information of the aperture 1 can be obtained through the displacement information detected by the displacement sensor 4, and the position of the aperture 1 can be detected. Compared with the prior art, the arc motion of the aperture 1 is converted into the linear motion of the output end of the conversion mechanism 3, and then the displacement sensor 4 can be used to realize the detection. Among them, the basic principle of the displacement sensor 4 is a sliding resistor, and it does not contain components such as chips that are not resistant to X-ray irradiation, so it can adapt to large-dose irradiation and is not easy to be damaged. And the displacement sensor 4 has high detection accuracy compared with the encoder.

[0033] The conversion mechanism 3 can be implemented in a variety of ways, and two specific implementations are described as examples:

[0034] Embodiment 1

[0035] The aperture position detection device of this embodiment is as follows: Figure 1 and Figure 2 As shown, the conversion mechanism 3 includes a linear guide 31 extending along a first direction and a sliding member 32 that can slide along the linear guide 31, and a first sliding groove 33 and a second sliding groove 34 are opened on the sliding member 32 along the second direction. The end of the connecting member 2 fits into the first sliding groove 33, and the displacement sensor 4 is connected to the second sliding groove 34. The second direction is perpendicular to the first direction.

[0036] In this way, when the connecting member 2 performs arc motion along with the aperture 1, the force pushing the sliding member 32 can be decomposed into a force along the first direction and a force along the second direction which are perpendicular to each other, wherein the force along the second direction causes the free end of the connecting member 2 to slide in the first slide groove 33 along the second direction, while the force along the first direction causes the connecting member 2 to push the inner wall of the first slide groove 33 extending along the second direction, thereby causing the sliding member 32 to perform a linear slide along the first direction. The arc motion of the connecting member 2 can then be converted into a linear slide. At the same time, the displacement sensor 4 is connected to the second slide groove 34 to facilitate the displacement sensor 4 to detect the distance information of the linear slide and obtain the position information of the aperture 1. The linear guide 31 can guide and limit the sliding of the sliding member 32.

[0037] It should be noted that, by providing the second slide groove 34, the connection mode between the displacement sensor 4 and the output end of the conversion mechanism 3 is in a form that matches the slide groove, which is convenient for assembly, and the second slide groove 34 can prevent the related moving parts of the displacement sensor 4 from getting stuck.

[0038] In order to ensure that when the connecting member 2 slides along the first slide groove 33, it will not hit the inner wall of the first slide groove 33 extending along the first direction, thereby blocking the normal movement of the connecting member 2. The distance that the first slide groove 33 extends along the second direction is greater than or equal to the displacement of the connecting member 2 in the second direction when the connecting member 2 moves in an arc shape. In this way, the distance that the connecting member 2 moves along the second direction is less than the distance that the first slide groove extends along the second direction, and the movement of the connecting member 2 will not be blocked.

[0039] Since the movement of the connecting member 2 is an arc movement, when the end of the connecting rod 2 moves in the first slide groove 33, it will not only slide in the first slide groove 33 along the second direction, but also rotate at a certain angle. Therefore, in order to reduce the friction between the free end of the connecting member 2 and the first slide groove 33 and facilitate the transmission of the mechanism force, Figure 3 As shown, the end of the connecting member 2 is sleeved with a bearing 5, and the outer wall of the bearing 5 abuts against the inner wall of the first slide groove 33 extending along the second direction. The arrangement of the bearing 5 can well adapt to the sliding and rotation of the end of the connecting member 2 in the first slide groove 33, reduce friction, facilitate force transmission, and ensure the accuracy of detection.

[0040] Here, the bearing 5 may be a rolling bearing or other bearings, which is not specifically limited in the embodiment of the present invention.

[0041] The specific structure of the displacement sensor 4 is as follows: Figure 2 and Figure 3 As shown, the displacement sensor 4 includes a variable resistor slide rail 41 and an extension shaft 42. The variable resistor slide rail 41 extends along the second direction. The first end of the extension shaft 42 can slide along the variable resistor slide rail 41, and the second end is fixedly connected to the second slide groove 34 of the sliding member 32. In this way, when the sliding member 32 moves linearly, it will pull the extension shaft 42 to slide along the variable resistor slide rail 41, so that the resistance value changes, and then the linear displacement information can be detected.

[0042] Furthermore, the displacement sensor 4 can be directly mounted on the arc gear ring 8, as shown in FIG. Figure 1 The sensor is mounted on a sensor mounting seat 10, and the sensor mounting seat 10 is mounted on an arc gear ring 8.

[0043] Here, the displacement sensor 4 may be a linear displacement sensor, or other displacement sensors that can achieve this function, which is not specifically limited in this embodiment.

[0044] Embodiment 2

[0045] The difference between the aperture position detection device of this embodiment and the first embodiment is that the conversion mechanism 3 is another implementation mode, specifically, Figure 6As shown, the conversion mechanism 3 includes a connecting rod 35 and a slider 36. One end of the connecting rod 35 is hinged to the connecting member 2, and the other end is hinged to the slider 36. The slider 36 is connected to the displacement sensor 4. In this way, since the length of the connecting rod 35 is fixed, when the connecting member 2 performs an arc motion, the distance between the connecting member 2 and the slider 36 gradually changes, and then the connecting rod 35 will push the slider 36 to slide linearly. That is, the above scheme constitutes a crank slider mechanism, and can also convert the arc motion of the connecting rod 2 into a linear motion, so that the displacement sensor 4 can detect the displacement information of the linear motion of the output end of the conversion mechanism 3, and then obtain the position information of the aperture 1.

[0046] It should be noted that, refer to Figure 6 The sliding of the slider 36 also requires a corresponding slide rail structure 37. The slider 36 is pushed by the connecting rod 35 and slides linearly along the slide rail structure 37. Of course, other components of the aperture position detection device of this embodiment, such as the connecting member 2 and the displacement sensor 4, are similar to those of the first embodiment, and only need to be adaptively matched and installed.

[0047] On the other hand, an embodiment of the present invention further provides a medical accelerator treatment head, comprising at least one diaphragm 1, the diaphragm 1 performs arc motion, and also comprises the above-mentioned diaphragm position detection device.

[0048] The medical accelerator treatment head provided by the embodiment of the present invention has an aperture 1 that moves in an arc shape. Therefore, after including the above-mentioned aperture position detection device, the position information of the aperture 1 can be effectively detected, and it can adapt to large-dose irradiation, is not easy to be damaged, and has high detection accuracy.

[0049] It should be noted that the arc motion of the aperture 1 is for better treatment, and there are many ways to achieve it. Generally, Figure 1 , Figure 4 and Figure 5 As shown, it is an implementation method. The medical accelerator treatment head of the embodiment of the present invention also includes a motor 6, a rotating gear 7 and an arc-shaped ring gear 8, wherein the rotating gear 7 is connected to the aperture 1. Under the drive of the motor 6, the rotating gear 7 can make an arc motion along the arc-shaped ring gear 8.

[0050] In the medical accelerator treatment head of this embodiment, the aperture 1 needs to perform arc motion along the arc gear ring 8, the sliding member 32 of the aperture position detection device needs to slide along the linear guide 31, and the extension shaft 42 of the displacement sensor 4 needs to slide along the variable resistor slide rail 41. The above-mentioned similar guide rail mechanisms need to be fixed to ensure the movement of the corresponding moving parts thereon. Therefore, referring to Figure 1 , Figure 4 and Figure 5, and also includes an arc-shaped gear ring mounting seat 9, so that the arc-shaped gear ring 8 can be mounted on the arc-shaped gear ring mounting seat 9. Of course, similarly, the linear guide 31 of the aperture position detection device can be fixed on the arc-shaped gear ring mounting seat 9; the variable resistor slide rail 41 of the displacement sensor 4 can also be fixed on the arc-shaped gear ring mounting seat 9. Figure 1 For the convenience of layout, the variable resistor slide rail 41 of the displacement sensor 4 can also be fixed on the end surface of the arc gear ring 8. Of course, the variable resistor slide rail 41 of the displacement sensor 4 can be fixed on the sensor mounting seat 10. The ultimate purpose of the above layout of the linear guide 31 and the variable resistor slide rail 41 is to be relatively fixed with the arc gear ring 8 to ensure the normal movement of the moving parts in the whole mechanism.

[0051] In addition, in the actual structure, there are often multiple apertures 1. In order to simplify the structure and facilitate the layout, the aperture position detection device of the embodiment of the present invention can detect the position information of multiple apertures 1 at one time. Figure 1 As shown, there are two diaphragms 1, which are matched with the two ends of the arc gear ring 8 respectively, so that the two diaphragms 1 share one arc gear ring 8 and one linear guide 31, and the corresponding other components (such as the sliding member 32 and the displacement sensor 4) are two. Taking the case of two diaphragms 1 as an example, in order to facilitate the layout and make the movement of the diaphragms 1 more stable, as shown in FIG. Figure 4 and Figure 5 As shown, the connecting rod 2 can pass through the aperture 1, and has bearings 5 ​​at both ends, and there are two corresponding arc-shaped gear rings 8, and the two arc-shaped gear rings 8 have tracks that match the bearings 5 ​​at both ends of the connecting member 2; accordingly, two rotating gears 7 can be set on both sides of the aperture 1 corresponding to the two arc-shaped gear rings 8, and the two rotating gears 7 are respectively matched with the two arc-shaped gear rings 8. In this way, the aperture 1 is more stable in the process of performing arc motion along the arc-shaped gear rings 8.

[0052] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope described in the claims.

Claims

1. A diaphragm position detection device for detecting position information of a diaphragm performing arc motion, characterized in that: The invention comprises a connecting member, a conversion mechanism and a displacement sensor, wherein the connecting member is fixed on the diaphragm, the input end of the conversion mechanism is connected to the connecting member, when the connecting member makes an arc motion along with the diaphragm, the conversion mechanism converts the arc motion of the connecting member into a linear motion, the displacement sensor is connected to the output end of the conversion mechanism, and is used to detect the displacement information of the linear motion of the output end of the conversion mechanism, and the displacement sensor is configured to be installed on the arc gear ring of the medical accelerator treatment head.

2. The aperture position detection device according to claim 1, characterized in that: The conversion mechanism includes a linear guide extending along a first direction and a sliding member that can slide along the linear guide, wherein the sliding member is provided with a first sliding groove and a second sliding groove along a second direction, the end of the connecting member fits into the first sliding groove, the displacement sensor is connected to the second sliding groove, and the second direction is perpendicular to the first direction.

3. The aperture position detection device according to claim 2, characterized in that: The distance that the first sliding groove extends along the second direction is greater than or equal to the displacement of the connecting member in the second direction when the connecting member moves in an arc shape.

4. The aperture position detection device according to claim 2, characterized in that: A bearing is sleeved on the end of the connecting member, and the outer wall of the bearing abuts against the inner wall of the first sliding groove extending along the second direction.

5. The aperture position detection device according to any one of claims 2 to 4, characterized in that: The displacement sensor comprises a variable resistor slide rail and a protruding shaft, wherein the variable resistor slide rail extends along the second direction, a first end of the protruding shaft can slide along the variable resistor slide rail, and a second end is connected to the second slide groove of the sliding member.

6. The aperture position detection device according to claim 1, characterized in that: The conversion mechanism comprises a connecting rod and a slider, one end of the connecting rod is hinged to the connecting member, and the other end is hinged to the slider, and the slider is connected to the displacement sensor.

7. A medical accelerator treatment head, comprising at least one aperture, the aperture moving in an arc shape, characterized in that: The invention comprises the aperture position detection device according to any one of claims 1 to 6.

8. The medical accelerator treatment head according to claim 7, characterized in that: It also includes a motor, a rotating gear and an arc-shaped gear ring, wherein the rotating gear is connected to the aperture, and driven by the motor, the rotating gear can make an arc-shaped motion along the arc-shaped gear ring.

9. The medical accelerator treatment head according to claim 8, characterized in that: It also includes an arc-shaped gear ring mounting seat, and the arc-shaped gear ring is mounted on the arc-shaped gear ring mounting seat.

10. The medical accelerator treatment head according to claim 9, characterized in that: The linear guide of the aperture position detection device is fixed on the arc-shaped gear ring mounting seat.

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