Radiotherapy abdominal pressure plate device capable of monitoring abdominal external pressure in real time

Abstract

The invention provides a radiotherapy abdominal pressure plate device capable of monitoring abdominal external pressure in real time, and the device comprises a thermoplastic film which is provided with a fastener; the abdominal pressure plate body is fixedly connected to one side of the thermoplastic body film; the pressurizing air bags are distributed on the abdominal pressure plate in an array mode, air inlet valves are arranged on air inlet pipelines of the pressurizing air bags, exhaust valves are arranged on exhaust pipelines of the pressurizing air bags, and air pressure sensors are arranged in the pressurizing air bags; a thin film pressure sensor; the control module is used for judging whether the patient is in an inspiration phase or an expiration phase in real time according to numerical values detected by the multiple thin film pressure sensors, and controlling the air inlet valves or the exhaust valves on the corresponding pressurizing air bags to be opened so as to adjust radiotherapy pressure; and judging the pressure difference according to the detection values of the air pressure sensors on the two adjacent pressurizing air bags and carrying out cooperative compensation. By means of detection of the thin film pressure sensor and the air pressure sensor, the breathing phase is dynamically recognized, pressure is actively released in the inspiration phase, pressure is compensated in the expiration phase, and the displacement error of the target area can be controlled to be smaller than or equal to 2 mm.

Description

Technical Field

[0001] This application relates to the technical field of medical radiotherapy equipment, and particularly to a radiotherapy abdominal pressing plate device capable of real-time monitoring of external abdominal pressure. Background Art

[0002] During radiotherapy, for abdominal tumor patients, accurate body position fixation and restriction of the patient's respiratory movement are crucial. An effective method for controlling abdominal pressure is to press the upper abdomen with an arched abdominal pressing plate to restrict the patient's respiratory movement. The main function of the radiotherapy abdominal pressing plate is to provide basic body position support, but this technology has many deficiencies.

[0003] On the one hand, the existing abdominal pressing plates cannot feedback the magnitude of the pressure acting on the patient's abdomen in real time, making it difficult for medical staff to accurately judge whether the pressure is appropriate. Too little pressure may lead to unstable body position fixation, affecting the radiotherapy accuracy; too much pressure may cause discomfort to the patient and even cause tissue damage.

[0004] On the other hand, during radiotherapy, the patient's physical state may change, such as changes in breathing and muscle tension. Uneven pressure distribution may cause discomfort or body position deviation to the patient. The traditional abdominal pressing plate cannot adjust the pressure in a timely manner according to these changes, and cannot meet the increasing requirements of clinical radiotherapy accuracy and patient comfort. Lack of dynamic feedback, the pressure cannot be adjusted according to the patient's respiratory state or body position changes during the treatment process.

[0005] In the latest radiotherapy technology, although the radiotherapy abdominal pressing plate can adjust the pressure through an airbag, its control logic is limited to static or single-dimensional pressure adjustment, lacking adaptability to the dynamic changes during the respiratory phase. Only the overall pressure value is feedback through a single pressure sensor.

[0006] In addition, the existing airbag control mostly adopts open-loop regulation, lacking a collaborative compensation mechanism for the pressure difference between adjacent airbags, which is prone to cause local overpressure or underpressure. Therefore, there is an urgent need for a device that can dynamically adjust the airbag pressure based on the respiratory phase and achieve pressure balance through multi-airbag collaborative control.

[0007] Therefore, there is an urgent need for an abdominal pressing plate device integrating respiratory phase recognition, multi-airbag collaborative PID control and real-time feedback to solve the above clinical pain points. The innovation of the present invention lies in combining the respiratory phase algorithm with multi-variable feedforward compensation to achieve dynamic adaptive pressure regulation and fill the gap in the existing technology. Summary of the Invention

[0008] In order to improve the problem that the existing radiotherapy abdominal pressure device cannot feedback the abdominal pressure value in real time and accurately restrict breathing, this application provides a radiotherapy abdominal pressing plate device capable of real-time monitoring of external abdominal pressure.

[0009] The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure provided by this application adopts the following technical solutions: A radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure, comprising: A thermoplastic film, with fastening components for fixation provided at its opposite ends; An abdominal pressure plate body, fixedly connected to one side of the thermoplastic film; A plurality of pressurizing air bags, which are arranged in an array on the abdominal pressure plate. An intake valve is provided on the intake pipeline of the pressurizing air bag, an exhaust valve is provided on the exhaust pipeline, and a pressure sensor is provided inside the pressurizing air bag; A thin film pressure sensor, attached to the side of the pressurizing air bag facing away from the abdominal pressure plate; and A control module, configured to determine in real time whether the patient is in the inspiratory phase or the expiratory phase according to the detection values of a plurality of the thin film pressure sensors, and control the opening of the intake valve or the exhaust valve on the corresponding pressurizing air bag to adjust the radiotherapy pressure; and determine the pressure difference according to the detection values of the pressure sensors on two adjacent pressurizing air bags and perform collaborative compensation.

[0010] Furthermore, the control module performs phase division according to the pressure change rate, and the calculation formula of the pressure change rate is as follows: ; Wherein, = 10ms, is the instantaneous pressure value detected by the thin film pressure sensor; When the pressure change rate is greater than +0.5 kPa / s, it is determined to be the inspiratory phase; When the pressure change rate is less than -0.3 kPa / s, it is determined to be the expiratory phase.

[0011] Furthermore, when the control module performs phase division, it is necessary to determine the phase switching only when at least three consecutive sampling points meet the determination conditions.

[0012] Furthermore, the calculation method of the opening force for the control module to control the exhaust valve or the intake valve to open is as follows: + + +

[0013] Wherein, P target - P actual

[0014] Wherein, represents the valve opening of the i-th pressurizing air bag; represents the pressure error; P target is the target pressure, Pactual is the actual pressure; and represent the proportional coefficient, integral coefficient, and differential coefficient respectively, which are obtained through clinical trials optimization; α represents the coupling coefficient, which is used to balance the pressure difference between adjacent pressurized airbags; represents the pressure difference feedback phase of adjacent pressurized airbags to adjust the inflation and deflation priority of adjacent pressurized airbags.

[0015] Furthermore, when the control module determines it is the inhalation phase, the control module controls the exhaust valve of the pressurized airbag in the pressure rising area to open to reduce the local pressure; at the same time, it controls the intake valve of the adjacent pressurized airbag to open to compensate for the pressure loss.

[0016] Furthermore, when the control module determines it is the exhalation phase, the control module controls the intake valve of the pressurized airbag in the pressure decreasing area to open to supplement the pressure; at the same time, it controls the exhaust valve of the pressurized airbag in the high pressure area to close to maintain the overall pressure balance.

[0017] Furthermore, when the air pressure sensor detects that the air pressure in the corresponding pressurized airbag is lower than the target value, the control module controls the corresponding intake valve to open for inflation and pressure increase; when the air pressure sensor detects that the air pressure in the pressurized airbag is higher than the target value, the control module controls the corresponding exhaust valve to open for rapid pressure reduction; when the air pressure sensor detects that the air pressure difference between adjacent pressurized airbags exceeds the first threshold, the inflation and deflation actions of the pressurized airbags are coordinated through the feedforward compensation algorithm to avoid local overpressure.

[0018] Furthermore, an example formula of the feedforward compensation algorithm is:

[0019] where represents the valve opening control input value after the pressure update of the i-th pressurized airbag; represents the current valve opening control input value of the i-th pressurized airbag; represents the coupling coefficient between the j-th pressurized airbag and the i-th pressurized airbag, which is used to quantify the influence weight of the pressure deviation of the j-th pressurized airbag adjacent to the i-th pressurized airbag on the control input of the i-th pressurized airbag; represents the current pressure value of the j-th pressurized airbag; P target,j represents the target pressure value of the j-th pressurized airbag; represents the summation only for other pressurized airbags j adjacent to the i-th pressurized airbag.

[0020] Furthermore, a plurality of reinforcing strips are arranged on the thermoplastic film, and the abdominal pressure plate body is attached to a side of the reinforcing strips away from the thermoplastic film.

[0021] Furthermore, the abdominal compression board body is arranged in a trapezoidal shape, and its upper base corresponds to the upper abdomen of the patient.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. Improve the accuracy of radiotherapy: By real-time monitoring of extra-abdominal pressure and timely adjustment according to pressure changes, it can ensure the stability of the patient's body position during radiotherapy, reduce radiotherapy errors caused by body position changes and inappropriate pressure, improve the accuracy of radiotherapy, and thus improve the treatment effect; 2. Improve patient comfort: Avoid discomfort and possible tissue damage caused by excessive pressure. When the pressure is too low, adjust it in time to ensure that the patient completes radiotherapy in a comfortable state. 3. Convenient for medical staff to operate: intuitive pressure display and alarm function enable medical staff to understand the patient's abdominal pressure in time, make adjustment decisions conveniently, and improve work efficiency. If the pressure in a certain area exceeds the safety threshold or is unevenly distributed, an audible and visual alarm will be triggered and an adjustment plan will be prompted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 A schematic diagram of the structure of the thermoplastic film and the reinforcing strip according to an embodiment of the present application; Figure 3 It is a schematic diagram of the working principle of an embodiment of the present application.

[0025] Reference numerals: 1. Thermoplastic film; 11. Fastener; 12. Reinforcement strip; 2. Abdominal pressure plate body; 3. Pressurized airbag; 4. Thin film pressure sensor. DETAILED DESCRIPTION

[0026] 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.

[0027] Currently, during radiotherapy for patients with abdominal tumors, respiratory movement can cause the target area to shift by 10 to 30 mm. However, because traditional abdominal compression boards cannot distinguish respiratory phases, the following problems often occur: Inspiratory phase: Diaphragm contraction causes the abdomen to bulge and local pressure to increase suddenly. If the pressure is not relieved in time, it may cause pain or body position shift in the patient. Exhalation phase: The abdomen falls back, resulting in uneven pressure distribution. If it is not dynamically compensated, the effect of body position fixation may be reduced.

[0028] In view of this, this application is specially made.

[0029] Reference Figure 1 and Figure 2 The present application embodiment discloses a radiotherapy abdominal pressure plate device capable of real-time monitoring of extra-abdominal pressure, which comprises: The thermoplastic film 1 has fastening members 11 for fixing at opposite ends thereof. The fastening members 11 may be concealed buckles, buttons or Velcro.

[0030] The abdominal compression board body 2 is made of a lightweight biocompatible material, medical-grade polyurethane, and is fixed to one side of the thermoplastic film 1. The abdominal compression board body 2 is set in a trapezoidal shape and its surface fits the curve of the human abdomen. Its upper bottom corresponds to the patient's upper abdomen and its lower bottom corresponds to the patient's lower abdomen. Its specific size is determined according to actual application requirements. In a specific application example, the upper bottom length of the abdominal compression board body 2 is 15 cm and the lower bottom length is 20 cm. In addition, a plurality of parallel reinforcing strips 12 are also provided on the thermoplastic film 1. The abdominal compression board body 2 is attached to the side of the reinforcing strip 12 away from the thermoplastic film 1. The width of the reinforcing strip 12 can be 50 mm, which is used to strengthen and fix the abdominal compression board body 2. Its length can change with the stretching of the thermoplastic film 1.

[0031] There are multiple pressurized airbags 3 and they are distributed in an array on the abdominal pressure plate. An air intake valve is provided on the air intake pipeline of the pressurized airbag 3 and an exhaust valve is provided on the exhaust pipeline. The air intake pipeline is connected to an air pump and the exhaust pipeline is connected to a vacuum generator. In addition, an air pressure sensor is provided in the pressurized airbag 3 to measure the pressure change in the pressurized airbag 3 to ensure that the pressure in the pressurized airbag 3 is within the safety threshold range. In this embodiment, there are five pressurized airbags 3, two of which are arranged in the upper row and three in the lower row, and the distance between two adjacent pressurized airbags 3 is equal.

[0032] The thin-film pressure sensor 4 is attached to the side of the pressurized airbag 3 facing away from the abdominal pressing plate. Specifically, it is a resistive flexible thin-film pressure sensor. In this embodiment, five thin-film pressure sensors 4 are also provided and are arranged in one-to-one correspondence with the five pressurized airbags 3. The diameter of the thin-film pressure sensor 4 is 18.3 mm, and the pressure range is 20 g to 6 kg. These thin-film pressure sensors 4 can sensitively sense pressure changes and convert the pressure signals into electrical signals to ensure that the pressure range that may be applied to the patient's abdomen during radiotherapy can be accurately measured.

[0033] The control module, referring to Figure 1 and Figure 3 , is used to determine whether the patient is in the inspiration phase or the expiration phase in real time according to the detection values of multiple thin-film pressure sensors 4, and control the opening of the intake valve or the exhaust valve on the corresponding pressurized airbag 3 to adjust the radiotherapy pressure; and determine the pressure difference according to the detection values of the air pressure sensors on two adjacent pressurized airbags 3 and perform collaborative compensation. Specifically, the control module includes a signal acquisition circuit and a data processing unit. The signal acquisition circuit is electrically connected to multiple thin-film pressure sensors 4 and multiple air pressure sensors, and is used to collect the pressure and air pressure at each point in real time, and transmit the collected electrical signals to the data processing unit; the data processing unit can be a microprocessor or a single-chip microcomputer, analyze and process the received electrical signals, calculate the pressure values at the positions measured by each thin-film pressure sensor 4 and the air pressure values inside each pressurized airbag 3, and integrate and analyze the pressure data to obtain the overall pressure distribution of the abdomen.

[0034] Furthermore, the data processing unit can also be connected to a display device and an alarm unit. The display device is used to display the pressure values and the pressure distribution in real time. The display device can be a liquid crystal display screen, which clearly and intuitively presents the pressure information; at the same time, an alarm threshold is set. When the detected pressure value exceeds the set safety range, the alarm unit immediately issues an alarm to remind the medical staff to adjust in time.

[0035] In specific applications, the respiratory characteristics are extracted through the thin-film pressure sensor 4 to determine the inspiration phase or the expiration phase. For example, during the inspiration phase, the diaphragm contracts and the abdomen bulges, and the pressure on the pressurized airbag 3 rises; during the expiration phase, the diaphragm relaxes and the abdomen falls back, and the pressure on the pressurized airbag 3 drops.

[0036] Thus, when implementing control, the control module divides the phase according to the pressure change rate. The calculation formula for the pressure change rate is as follows: ; where = 10 ms, is the instantaneous pressure value detected by the thin-film pressure sensor 4, is the instantaneous pressure value detected by the thin-film pressure sensor 4 before the time; When the pressure change rate is greater than +0.5 kPa / s, it is determined as the inhalation phase; When the pressure change rate is less than -0.3 kPa / s, it is determined as the exhalation phase; Among them, both +0.5 kPa / s and -0.3 kPa / s are clinical thresholds, which can be optimized according to actual clinical data.

[0037] Moreover, when the control module performs phase division, it is necessary to determine the phase switch only when at least three consecutive sampling points meet the determination conditions to avoid instantaneous noise interference.

[0038] Thus, when the pressure sensor detects that the air pressure in the corresponding pressurized airbag 3 is lower than the target value, the control module controls the corresponding intake valve to open for inflation and pressurization; When the pressure sensor detects that the air pressure in the pressurized airbag 3 is higher than the target value, the control module controls the corresponding exhaust valve to open for rapid pressure reduction.

[0039] Furthermore, during the inhalation phase, the power supply of the intake valve can be physically disconnected through a relay. If the pressure exceeds the safety threshold, that is, P > P target +5%, the exhaust valve is activated. If the pressure is within the target range, the intake valve is kept closed. During the exhalation phase, the exhaust valve in the high-pressure area is closed to prevent excessive pressure relief.

[0040] Therefore, by dynamically identifying the breathing phase, actively relieving pressure during the inhalation phase and compensating pressure during the exhalation phase, the target area displacement error can be controlled within ≤2 mm.

[0041] And, the calculation method for the control module to control the opening force of the exhaust valve or the intake valve is as follows: + + +

[0042] Among them, P target - P actual

[0043] Among them, represents the valve opening of the i-th pressurized airbag; represents the pressure error; P target is the target pressure, P actual is the actual pressure; 、 respectively represent the proportional coefficient, integral coefficient, and differential coefficient, which are obtained through clinical trial optimization; α represents the coupling coefficient, which is used to balance the pressure difference between adjacent pressurized airbags; represents the pressure difference feedback phase of adjacent pressurized airbags to adjust the charging and discharging priorities of adjacent pressurized airbags.

[0044] In addition, when the control module determines it is the inhalation phase, the control module controls the exhaust valve of the pressurizing airbag 3 in the pressure rising area to open, so as to reduce the local pressure; at the same time, it controls the intake valve of the adjacent pressurizing airbag 3 to open to compensate for the pressure loss.

[0045] When the control module determines it is the exhalation phase, the control module controls the intake valve of the pressurizing airbag 3 in the pressure dropping area to open to supplement the pressure; at the same time, it controls the exhaust valve of the pressurizing airbag 3 in the high-pressure area to close to maintain the overall pressure balance.

[0046] Moreover, when the air pressure sensor detects that the air pressure difference between adjacent pressurizing airbags 3 exceeds the first threshold value, the feedforward compensation algorithm is used to coordinate the inflation and deflation actions of the pressurizing airbag 3 for collaborative compensation to avoid local overpressure, where the first threshold value can be set at ±5% of the target pressure.

[0047] Among them, an example formula of the feedforward compensation algorithm is:

[0048] Among them, represents the valve opening control input value after the pressure update of the i-th pressurizing airbag 3; represents the current valve opening control input value of the i-th pressurizing airbag 3; represents the coupling coefficient between the j-th pressurizing airbag 3 and the i-th pressurizing airbag 3, which is used to quantify the influence weight of the pressure deviation of the adjacent pressurizing airbag j on the control input of the pressurizing airbag i; represents the current pressure value of the j-th pressurizing airbag 3; P target,j represents the target pressure value of the j-th pressurizing airbag 3; means summing only for other pressurizing airbags j adjacent to the pressurizing airbag i.

[0049] In addition, when , the adjacent pressurizing airbag pair with the largest pressure difference is preferentially adjusted, where .

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure, characterized in that, Comprising: A thermoplastic film, with fastening components for fixation provided at its opposite ends; An abdominal pressing plate body, fixedly connected to one side of the thermoplastic film; Pressurizing airbags, provided in multiple numbers and distributed in an array on the abdominal pressing plate. An intake valve is provided on the intake air pipeline of the pressurizing airbag, an exhaust valve is provided on the exhaust air pipeline, and a pressure sensor is provided inside the pressurizing airbag; A thin-film pressure sensor, attached to the side of the pressurizing airbag facing away from the abdominal pressing plate; And A control module, which is used to determine in real time whether the patient is in the inhalation phase or the exhalation phase according to the detection values of multiple thin-film pressure sensors, and control the opening of the intake valve or the exhaust valve on the corresponding pressurizing airbag to adjust the radiotherapy pressure; and determine the pressure difference according to the detection values of the pressure sensors on two adjacent pressurizing airbags and perform collaborative compensation.

2. The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 1, characterized in that, The control module divides the phase according to the pressure change rate, and the calculation formula of the pressure change rate is as follows: ； Among them, = 10 ms, is the instantaneous pressure value detected by the thin-film pressure sensor; When the pressure change rate is greater than +0.5 kPa / s, it is determined to be the inhalation phase; When the pressure change rate is less than -0.3 kPa / s, it is determined to be the exhalation phase.

3. The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 2, characterized in that, When the control module divides the phase, it is necessary to determine the phase switch only when at least three consecutive sampling points meet the determination conditions.

4. The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 1, characterized in that, The calculation method for the opening force of the control module to control the exhaust valve or the intake valve is as follows: + + + Among them, P target - P actual ; Among them, represents the valve opening of the i-th pressurizing airbag; represents the pressure error; P target is the target pressure, P actual is the actual pressure; , respectively represent the proportional coefficient, integral coefficient, and differential coefficient, which are obtained by optimizing through clinical trials; α represents the coupling coefficient, which is used to balance the pressure difference between adjacent pressurizing airbags; represents the phase of the pressure difference feedback between adjacent pressurizing airbags to adjust the charging and discharging priorities of adjacent pressurizing airbags.

5. The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 4, characterized in that, When the control module determines it is the inhalation phase, the control module controls the exhaust valve of the pressurizing airbag in the pressure rising area to open to reduce the local pressure; at the same time, it controls the intake valve of the adjacent pressurizing airbag to open to compensate for the pressure loss.

6. The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 4, characterized in that, When the control module determines it is the exhalation phase, the control module controls the intake valve of the pressurizing airbag in the pressure dropping area to open to supplement the pressure; at the same time, it controls the exhaust valve of the pressurizing airbag in the high-pressure area to close to maintain the overall pressure balance.

7. A radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 4, characterized in that When the pressure sensor detects that the air pressure in the corresponding pressurizing airbag is lower than the target value, the control module controls the corresponding intake valve to open for inflation and pressurization; When the pressure sensor detects that the air pressure in the pressurizing airbag is higher than the target value, the control module controls the corresponding exhaust valve to open for rapid pressure reduction; When the pressure sensor detects that the air pressure difference between adjacent pressurizing airbags exceeds the first threshold, the feed-forward compensation algorithm is used to coordinate the air intake and exhaust actions of the pressurizing airbags to avoid local overpressure.

8. A radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 7, characterized in that The example formula of the feed-forward compensation algorithm is: Among them, represents the valve opening control input value after the pressure update of the i-th pressure boosting airbag; represents the current valve opening control input value of the i-th pressure boosting airbag; represents the coupling coefficient between the j-th pressure boosting airbag and the i-th pressure boosting airbag, which is used to quantify the influence weight of the pressure deviation of the adjacent pressure boosting airbag j on the control input of the pressure boosting airbag i; represents the current pressure value of the j-th pressure boosting airbag; P target,j represents the target pressure value of the j-th pressure boosting airbag; represents the summation only for other pressure boosting airbags j adjacent to the pressure boosting airbag i.

9. The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 1, wherein, A plurality of reinforcing strips are also provided on the thermoplastic film, and the abdominal pressing plate body is attached to the side of the reinforcing strip facing away from the thermoplastic film.

10. The radiotherapy abdominal pressure plate device capable of real-time monitoring of external abdominal pressure according to claim 1, characterized in that, The abdominal pressing plate body is trapezoidally arranged, and its upper base corresponds to the upper abdomen of the patient.

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