Radiotherapy positioning device for limiting abdominal respiratory movement and use method thereof

Abstract

The invention provides a radiotherapy positioning device for limiting abdominal respiratory movement and a use method thereof. The radiotherapy positioning device for limiting abdominal respiratory movement is arranged on the body surface of a patient, and comprises a shrinkable film which is arranged around the patient and is provided with an opening in the abdomen of the patient; the abdominal pressure structure is arranged between the shrinkable film and the lower thoracic cavity area of the patient and used for being matched with the shrinkable film to apply pressure to the lower thoracic cavity area of the patient. And the radiotherapy precision can be improved.

Description

Technical Field

[0001] The present invention relates to the field of radiotherapy positioning technology, and in particular to a radiotherapy positioning device for limiting abdominal respiratory movement and a use method thereof. Background Art

[0002] During abdominal radiotherapy, breathing movements can cause the abdomen, which contains many important organs such as the liver, stomach, pancreas, intestines, etc., to move significantly during breathing. During normal breathing, the contraction and relaxation of the diaphragm drives the pressure changes in the chest and abdominal cavities, which in turn causes the abdominal organs to move up and down, front and back, and left and right. Taking the liver as an example, during calm breathing, its up and down movement can reach 1~2 cm or even more, and the displacement will increase further during deep breathing or strenuous exercise. This will make the target area (tumor area) of radiotherapy less accurately positioned, affect the treatment effect, and may increase the risk of unnecessary irradiation of surrounding normal tissues. Summary of the invention

[0003] The present invention provides a radiotherapy positioning device for limiting abdominal respiratory movement and a use method thereof, which can improve radiotherapy accuracy.

[0004] On the one hand, a radiotherapy positioning device for limiting abdominal respiratory movement is provided, which is arranged on the patient's body surface and includes: A shrinkable film, the shrinkable film is arranged around the patient, the shrinkable film is arranged with an opening on the abdomen of the patient; the shrinkable film has a softened state and a hardened state, and the softened state and the hardened state of the shrinkable film are switched by regulating the temperature of the shrinkable film; the shrinkable film in the softened state is arranged around the patient, and as the temperature of the shrinkable film decreases, the shrinkable film shrinks and is in the hardened state; The abdominal pressure structure is arranged between the shrinkable membrane and the lower thoracic area of ​​the patient, and is used to cooperate with the shrinkable membrane to apply pressure to the lower thoracic area of ​​the patient.

[0005] Optionally, the shrinkable film is a thermoplastic film.

[0006] Optionally, the abdominal pressure structure is an abdominal pressure plate with a trapezoidal cross-section.

[0007] Optionally, the thickness of the abdominal pressure plate is 3-6 cm, the bottom side length of the trapezoidal cross section is 20-25 cm, the top side length of the trapezoidal cross section is 6-8 cm, and the height of the trapezoidal cross section is 6-10 cm.

[0008] Optionally, a plurality of air holes are provided on the surface of the shrinkable film.

[0009] Optionally, the abdominal pressure structure is a foamed rubber abdominal pressure bag, and the foamed rubber abdominal pressure bag comprises a bag body and foamed rubber placed in the bag body; The foaming glue is a mixture of foaming glue A and foaming glue B. The foaming glue A and foaming glue B are mixed to generate heat and gas, so that the bag body expands.

[0010] Optionally, foaming glue A comprises polyether polyol, and foaming glue B comprises polyisocyanate.

[0011] Optionally, the foamed rubber abdominal pressure bag has a length of 22 to 27 cm, a width of 18 to 22 cm, and a height of 3 to 5 cm.

[0012] In another aspect, a method for using a radiotherapy positioning device for limiting abdominal respiratory movement is provided, comprising: Place the abdominal pressure structure in the patient's lower thoracic area; heating the shrinkable film to soften the shrinkable film; The shrinkable film is placed around the patient. As the temperature of the shrinkable film decreases, the shrinkable film shrinks and becomes hardened to fix the abdominal pressure structure.

[0013] Optionally, heating the shrinkable film to soften the shrinkable film comprises: Heat the shrinkable film in hot water at a temperature of 60 to 80 degrees Celsius for 14 to 18 minutes.

[0014] The beneficial effects brought by the technical solution provided by the present invention are: First, it can improve the accuracy of radiotherapy, effectively reduce the target displacement error caused by respiratory movement, and make the radiotherapy rays more accurately focused on the tumor tissue, thereby improving the killing effect on the tumor.

[0015] Second, protecting normal tissues, precise positioning helps reduce the radiation dose to surrounding normal tissues, lowers the probability of radiotherapy complications, and improves the patient's quality of life.

[0016] Third, compared with the traditional integrated abdominal compression plate fixation technology, the abdominal compression area is larger, the comfort is better, the positioning time is faster, the positioning error is smaller, and the effect of limiting respiratory movement is better.

[0017] Fourth, compared with traditional active respiratory restriction techniques such as active respiratory gating technology, this type of fixation technology requires less positioning and treatment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are 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.

[0019] Figure 1 A schematic structural diagram of a radiotherapy positioning device for limiting abdominal respiratory movement provided by the present invention; Figure 2 The present invention provides a Figure 1 A cross-sectional view of the middle dotted line BB`; Figure 3 Another method provided by the present invention is to Figure 1 A cross-sectional view of the middle dotted line BB`; Figure 4 The present invention provides a Figure 1 A cross-sectional view of the dashed line AA`; Figure 5 A flow chart of a method for using a radiotherapy positioning device for limiting abdominal respiratory movement provided by the present invention; Figure 6 An experimental result diagram provided by the present invention; Figure 7 Another experimental result diagram provided by the present invention.

[0020] 1: Patient; 11: Patient's head; 12: Upper thoracic area; 13: Lower thoracic area; 14: Abdomen; 2: shrinkable film; 21: opening; 22: air vent; 3: abdominal pressure structure; 4: Fixed structure. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0022] Figure 1 A schematic structural diagram of a radiotherapy positioning device for limiting abdominal respiratory movement provided by the present invention. Figure 1 For cross-sectional views, see Figure 1 The device is arranged on the body surface of the patient 1, and comprises: A shrinkable film 2, the shrinkable film 2 is arranged around the patient 1, and the shrinkable film 2 is provided with an opening 21 on the abdomen 14 of the patient; The abdominal pressure structure 3 is disposed between the shrinkable membrane 2 and the lower thoracic region 13 of the patient 1 , and is used to cooperate with the shrinkable membrane 2 to apply pressure to the lower thoracic region 13 of the patient 1 .

[0023] The present invention provides a radiotherapy positioning device for limiting abdominal respiratory movement, which has the following technical effects: First, it can improve the accuracy of radiotherapy, effectively reduce the target displacement error caused by respiratory movement, and make the radiotherapy rays more accurately focused on the tumor tissue, thereby improving the killing effect on the tumor.

[0024] Second, protecting normal tissues, precise positioning helps reduce the radiation dose to surrounding normal tissues, lowers the probability of radiotherapy complications, and improves the patient's quality of life.

[0025] Third, compared with the traditional integrated abdominal compression plate fixation technology, the abdominal compression area is larger, the comfort is better, the positioning time is faster, the positioning error is smaller, and the effect of limiting respiratory movement is better.

[0026] Fourth, compared with traditional active respiratory restriction techniques such as active respiratory gating technology, this type of fixation technology requires less positioning and treatment time.

[0027] In this embodiment, the patient 1 includes a patient head region 11, an upper thoracic region 12, a lower thoracic region 13 and an abdomen 14. The upper thoracic region 12 and the lower thoracic region 13 are divided by the edge of the patient's ribs.

[0028] In this embodiment, the shrinkable film 2 is a thermoplastic film. The thermoplastic film is used as the shrinkable film, so that the shrinkable film can be shrunk by heating the shrinkable film.

[0029] In this embodiment, the abdominal pressure structure 3 is an abdominal pressure plate with a trapezoidal cross section. The abdominal pressure plate with a trapezoidal cross section better fits the edge of the patient's ribs, thereby ensuring the compression effect on the patient's lower chest area. Figure 2 , Figure 2 for Figure 1 Cross-sectional view along the dashed line BB`.

[0030] In this embodiment, the thickness of the abdominal pressure plate is 3~6cm, the bottom side length of the trapezoidal cross-section is 20~25cm, the top side length of the trapezoidal cross-section is 6~8cm, and the height of the trapezoidal cross-section is 6~10cm.

[0031] Exemplarily, the thickness of the abdominal pressure plate is 4 cm, the bottom side length of the trapezoidal cross section is 22 cm, the top side length of the trapezoidal cross section is 7 cm, and the height of the trapezoidal cross section is 8 cm.

[0032] The use of a trapezoidal abdominal compression plate of the above dimensions can ensure the compression effect.

[0033] In this embodiment, a plurality of ventilation holes 22 are provided on the surface of the shrinkable film 2. The ventilation holes are provided to facilitate ventilation of the patient's skin.

[0034] In this embodiment, as a substitute for the trapezoidal abdominal pressure plate, the abdominal pressure structure 3 can also adopt a foamed rubber abdominal pressure bag. The use of the foamed rubber abdominal pressure bag can also achieve the abdominal pressure effect on the lower chest area. Figure 1 and Figure 3 As shown, the foamed plastic abdominal pressure bag can be rectangular.

[0035] In this embodiment, foaming gel is injected into the abdominal pressure bag, wherein the foaming gel includes foaming gel A and foaming gel B. After the foaming gel A and the foaming gel B react, heat and gas are generated, thereby expanding the abdominal pressure bag.

[0036] Foaming glue A is polyether polyol. The main component is a polymer formed by polymerization of polyol with ethylene oxide, propylene oxide, etc. under the action of a catalyst. The molecular chain contains multiple hydroxyl groups, which provide active sites for the foaming reaction.

[0037] Catalysts: such as organic tin compounds such as stannous octoate, can accelerate the foaming reaction and control the reaction process.

[0038] Surfactants: such as silicone oil surfactants, which can reduce the surface tension of liquids, make the foam uniform and stable, and prevent the foam from breaking and collapsing.

[0039] Other additives: May contain flame retardants, UV absorbers, etc. to give the foam specific properties.

[0040] The foaming glue B includes polyisocyanate, such as toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), etc. The foaming glue B undergoes a cross-linking reaction with the polyether polyol in the foaming glue A to form a polyurethane foam.

[0041] Foaming agent: Physical foaming agents such as pentane, dichloromethane, etc., or chemical foaming agents such as azodicarbonamide, etc., decompose or vaporize when heated during the reaction to produce gas, causing the foam to expand.

[0042] In this embodiment, the foamed plastic abdominal pressure bag has a length of 22-27 cm, a width of 18-22 cm, and a height of 3-5 cm.

[0043] Exemplarily, the foamed plastic abdominal pressure bag has a length of 25 cm, a width of 20 cm and a height of 4 cm.

[0044] Using a foam abdominal pressure bag of the above size can ensure the compression effect.

[0045] Figure 4 A method provided by this embodiment Figure 1 The cross-sectional view of the dotted line AA'. The shrinkable membrane 2 is arranged around the patient. It also includes: The fixing structure 4 is disposed between the shrinkable film 2 and the back of the patient 1 , and surrounds the back of the patient 1 .

[0046] In this embodiment, providing a fixing structure is helpful to further ensure the fixing effect.

[0047] In this embodiment, the fixing structure 4 is a vacuum bag. The vacuum bag can be used to surround the back of the patient.

[0048] Figure 5 This is a flow chart of the method for using a radiotherapy positioning device for limiting abdominal respiratory movement provided by the present invention. Figure 5 ,include: S101, setting a fixing structure on the patient's back.

[0049] The patient needs to fast for 3 to 4 hours, with the upper body naked. Before making the model, the patient's breathing is trained, and the patient's upper abdomen is pressed by hand, with the force gradually increased, and the patient's tolerance to the pressure on the abdomen is observed step by step. The patient raises both hands and holds the handle above the head, and a vacuum bag or body foam is selected as the fixing structure to fix the patient.

[0050] S102. Setting the abdominal pressure structure in the lower chest area of ​​the patient.

[0051] The production process of the trapezoidal abdominal pressure plate is as follows: Choose a foam board with a slightly higher hardness. The thickness of the trapezoidal foam board is about 4 cm, the upper side of the trapezoidal section is 6-8 cm, the lower side of the trapezoidal section is 20-25 cm, and the height of the trapezoidal section is 8 cm. It can be slightly increased or decreased according to the patient's body size. The size of the small foam is 25 cm long and 20 cm wide. The amount of foam material poured can be selected according to the patient's body size.

[0052] Place the trapezoidal foam abdominal compression board at the costal margin below the xiphoid process of the patient, and then fix the abdomen with the softened body thermoplastic film. Press the thermoplastic film against the trapezoidal foam board and press the trapezoidal foam board along the edge of the foam board. During the cooling process of the thermoplastic film, press the foam board with your hand and ask the patient to exhale. In this way, after the thermoplastic film cools down, the thermoplastic film will be tighter and better limit the patient's breathing movement. Then use double-sided tape to fix the trapezoidal foam abdominal compression board on the thermoplastic film.

[0053] In another embodiment provided by the present invention, a foamed rubber abdominal pressure bag is provided as an abdominal pressure structure, and the foamed rubber expands through the reaction between foamed rubber A and foamed rubber B. During the expansion of the foamed rubber, the shrinkable film shrinks and hardens, thereby ensuring the pressure on the lower chest cavity of the patient.

[0054] A window is opened below the thermoplastic film near the lower abdomen to leave space for equipment to monitor the respiratory curve.

[0055] S103, heating the shrinkable film to soften the shrinkable film.

[0056] In one example, step S103 includes: Heat the shrinkable film in hot water at a temperature of 60 to 80 degrees Celsius for 14 to 18 minutes.

[0057] Exemplarily, the shrinkable film is heated in hot water at a temperature of 70 degrees Celsius for 15 minutes.

[0058] By heating the shrinkable film with hot water at the above temperature within the above time range, the shrinkable film can be softened, thereby ensuring that the shrinkable film can exert a certain pressure on the patient's body surface during the cooling process.

[0059] S104, placing a shrinkable film around the patient, and as the temperature of the shrinkable film decreases, the shrinkable film shrinks and becomes in a hardened state, thereby fixing the abdominal pressure structure.

[0060] The sensor of the respiratory gating system is correctly placed on the patient's abdomen and connected to the computer system. After the connection, the respiratory signal is calibrated to ensure that the system can accurately monitor the patient's respiratory cycle. This process may require the patient to cooperate with several deep breaths or normal breathing so that the system can obtain accurate respiratory baseline signals. CT scan data acquisition, after the patient's position is fixed and the respiratory monitoring equipment is calibrated, a CT scan is performed. The CT scan will perform multiple scans at different stages of the patient's respiratory cycle to obtain complete movement information of the tumor and surrounding tissues during the respiratory process. These data will be used for subsequent radiotherapy plan design.

[0061] Figure 6 The patient's breathing curve diagram using the radiotherapy positioning device for limiting abdominal respiratory movement of the present application shows that the patient's breathing curve in the diagram is characterized by a reduced breathing amplitude and an increased breathing frequency.

[0062] Figure 7 When the radiotherapy positioning device for limiting abdominal respiratory movement of the present application is used, the patient's lower chest cavity is removed. The compression area of ​​the lower chest cavity area is larger, and the compression effect is better.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radiotherapy positioning device for limiting abdominal respiratory movement, arranged on the patient's body surface, characterized in that: include: A shrinkable film, the shrinkable film is arranged around the patient, the shrinkable film is arranged with an opening on the abdomen of the patient; the shrinkable film has a softened state and a hardened state, and the softened state and the hardened state of the shrinkable film are switched by regulating the temperature of the shrinkable film; the shrinkable film in the softened state is arranged around the patient, and as the temperature of the shrinkable film decreases, the shrinkable film shrinks and is in the hardened state; The abdominal pressure structure is arranged between the shrinkable membrane and the lower thoracic area of ​​the patient, and is used to cooperate with the shrinkable membrane to apply pressure to the lower thoracic area of ​​the patient.

2. The radiotherapy positioning device for limiting abdominal respiratory movement according to claim 1, characterized in that: The shrinkable film is a thermoplastic film.

3. The radiotherapy positioning device for limiting abdominal respiratory movement according to claim 1, characterized in that: The abdominal pressure structure is an abdominal pressure plate with a trapezoidal cross section.

4. The radiotherapy positioning device for limiting abdominal respiratory movement according to claim 3, characterized in that: The thickness of the abdominal pressure plate is 3~6cm, the bottom side length of the trapezoidal cross section is 20~25cm, the top side length of the trapezoidal cross section is 6~8cm, and the height of the trapezoidal cross section is 6~10cm.

5. The radiotherapy positioning device for limiting abdominal respiratory movement according to claim 1, characterized in that: A plurality of air holes are provided on the surface of the shrinkable film.

6. The radiotherapy positioning device for limiting abdominal respiratory movement according to claim 1, characterized in that: The abdominal pressure structure is a foamed rubber abdominal pressure bag, which includes a bag body and foamed rubber placed in the bag body; The foaming glue is a mixture of foaming glue A and foaming glue B. The foaming glue A and foaming glue B are mixed to generate heat and gas, so that the bag body expands.

7. The radiotherapy positioning device for limiting abdominal respiratory movement according to claim 6, characterized in that: Foam A comprises polyether polyol, and foam B comprises polyisocyanate.

8. The radiotherapy positioning device for limiting abdominal respiratory movement according to claim 6 or 7, characterized in that: The length of the foam abdominal pressure bag is 22~27cm, the width is 18~22cm, and the height is 3~5cm.

9. A method for using a radiotherapy positioning device for limiting abdominal respiratory movement, characterized in that: include: Place the abdominal pressure structure in the patient's lower thoracic area; heating the shrinkable film to soften the shrinkable film; The shrinkable film is placed around the patient. As the temperature of the shrinkable film decreases, the shrinkable film shrinks and becomes hardened to fix the abdominal pressure structure.

10. The method for using the radiotherapy positioning device for limiting abdominal respiratory movement according to claim 9, characterized in that: Heating the shrinkable film to soften the shrinkable film includes: Heat the shrinkable film in hot water at a temperature of 60 to 80 degrees Celsius for 14 to 18 minutes.

Images