Noise control type air bag type nuclear magnetic resonance skull fixing device

Abstract

The invention discloses a noise control type air bag type nuclear magnetic resonance head fixing device, and relates to the technical field of nuclear magnetic resonance. The earphone specifically comprises an air bag, a sound transmission pipeline and a loudspeaker, the sound transmission pipeline is communicated with the air bag, the loudspeaker is arranged in the sound transmission pipeline, a closed space is formed in the sound transmission pipeline and the air bag, vibrating diaphragms are arranged at the positions, corresponding to ears, of the air bag, and the loudspeaker is used for generating vibration to gas in the sound transmission pipeline. Sound is transmitted to the vibrating diaphragm through gas vibration, the vibrating diaphragm vibrates under the action of gas vibration and generates sound, and therefore the sound is transmitted to the ears of a patient.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear magnetic resonance, and in particular provides a noise-controlled airbag-type nuclear magnetic resonance head fixation device. Background Art

[0002] Magnetic resonance imaging is applicable to the diagnosis of almost all diseases of the body, especially for the diagnosis of brain, spine and other diseases. Patients need to hold their breath to cooperate with the examination. When breath holding is required, the medical staff reminds the patient to start holding his breath, and then the patient starts holding his breath. At this time, the medical staff can obtain more accurate examination results and avoid artifacts caused by the patient's breathing.

[0003] However, MRI equipment generates a lot of noise when working, which can easily cause patients to be unable to hear the instructions of medical staff and fail to hold their breath accurately. Because there cannot be metal foreign objects during MRI examinations, and it is also impossible to place headphones, speakers and other equipment on the patient's head, so during the examination, it is often necessary to stop the examination and shut down the MRI equipment before communicating with the patient. Only after multiple examinations can accurate examination data be obtained. There are problems of low examination efficiency and high examination costs. Summary of the invention

[0004] The present invention provides a noise-controlled airbag-type nuclear magnetic resonance head fixation device, which is used to solve the problem that the noise of nuclear magnetic resonance equipment causes patients to be unable to hear the prompts of medical staff, resulting in low examination efficiency and high examination cost.

[0005] The technical solution of the present invention is as follows:

[0006] A noise-controlled airbag-type nuclear magnetic resonance head fixation device is used to fix a patient's head in the base of a magnetic resonance head and neck combined coil on an examination bed, comprising an airbag, a sound transmission tube and a speaker. The sound transmission tube is connected to the airbag, the speaker is arranged in the sound transmission tube, and a closed space is formed in the sound transmission tube and the airbag. A diaphragm is arranged at a position corresponding to the airbag and the ear. The speaker is used to generate vibrations to the gas in the sound transmission tube, and the sound is transmitted to the diaphragm through the gas vibration. The diaphragm vibrates and generates sound under the action of the gas vibration, thereby transmitting the sound to the patient's ear.

[0007] In this solution, the airbag and the sound transmission tube form a closed space. The sound emitted by the speaker can generate gas vibration in the closed space formed by the airbag and the sound transmission tube. The gas vibration can be transmitted to the diaphragm. The diaphragm is located in the patient's ear. When the gas in the airbag vibrates, it will cause the diaphragm to vibrate. The sound generated by the diaphragm vibration can be directly transmitted to the patient's ear. Because the diaphragm is located in the patient's ear, the patient can clearly hear the sound of the speaker. The medical staff can issue prompts through the speaker so that the patient can cooperate with the examination in time according to the prompts of the medical staff, such as controlling the breath holding time according to the prompts of the medical staff. There is no need to stop the examination and communication, which can improve the efficiency of the examination and reduce the cost of the examination. The sound transmission tube can transmit the sound emitted by the speaker to the diaphragm by gas vibration, so that the speaker can be kept away from the nuclear magnetic resonance equipment, and the nuclear magnetic resonance examination will not be affected by the speaker.

[0008] Preferably, the fixing device also includes an air supply pipeline and an air source, one end of the air supply pipeline is connected to the airbag, and the other end of the air supply pipeline is connected to the air source, and the air source is used to inflate the airbag, so that the airbag expands and presses the patient's head from the side. The internal air pressure after the airbag expands keeps the diaphragm in a taut state.

[0009] In this solution, the airbag is connected to both a sound transmission pipe and an air supply pipe. The air supply pipe is used to supply air to the airbag. When the airbag is inflated, it can be pressed against the patient's head from the side to fix the patient's head. Only after the airbag is inflated can the diaphragm be in a taut state, ensuring that the diaphragm contacts the gas vibration and vibrates to produce sound.

[0010] In another embodiment, the fixing device also includes an air supply pipeline and an air source, one end of the air supply pipeline is connected to the sound transmission pipeline, and the other end of the air supply pipeline is connected to the air source. The air source inflates the airbag through the air supply pipeline and the sound transmission pipeline, so that the airbag expands and presses the patient's head from the side. The internal air pressure after the airbag expands puts the diaphragm in a taut state.

[0011] In this solution, only one sound transmission tube is connected to the airbag, and the sound transmission tube is also used to supply air to the airbag. This arrangement can reduce the number of tubes on the airbag and avoid the problem of tube mixing.

[0012] Preferably, the airbag is fixed in the base of the magnetic resonance head and neck combined coil, the length of the sound transmission tube is greater than the length of the examination bed, and the speaker is arranged at one end of the sound transmission tube away from the airbag.

[0013] In this solution, the diaphragm is located at the patient's ear, so the position of the airbag is within the examination area of ​​the MRI equipment. The length of the sound transmission tube is greater than the length of the examination bed, so that the end of the sound transmission tube away from the airbag can be located outside the examination area of ​​the MRI equipment, which can prevent the speaker from entering the examination area of ​​the MRI equipment and preventing the speaker from being adsorbed on the MRI equipment and interfering with the examination.

[0014] Preferably, the fixing device comprises two airbags, the two airbags are respectively used to abut against two sides of the patient's head, a connecting pipe is provided between the two airbags, and the two airbags are connected through the connecting pipe.

[0015] In this solution, two airbags are provided to clamp the patient's head from both sides, thereby fixing the patient's head. In addition, the head sizes of different patients are also different, and the airbag clamping method can be adapted to different patients, which has the advantage of good versatility.

[0016] In order to avoid cross infection caused by contact between different patients and the airbag during examination, an isolation towel is provided on the side of the airbag close to the human body. The isolation towel is used to isolate the patient's skin from the airbag, and the isolation towel is detachably connected to the airbag.

[0017] In this solution, the isolation towel can isolate the patient's skin and the airbag. When examining different patients, the isolation towel on the airbag can be replaced, which can greatly reduce the probability of cross-infection among patients.

[0018] Preferably, the sound transmission tube passes through the airbag, the end of the sound transmission tube is connected to the diaphragm, the interior of the sound transmission tube and the interior of the airbag are separated by the sound transmission tube, and the gas vibration generated by the speaker is transmitted to the diaphragm along the interior of the sound transmission tube.

[0019] In this solution, the speaker emits sound to vibrate the gas in the sound transmission pipe, and the gas vibration propagates along the sound transmission pipe to the diaphragm. The transmission pipe and the diaphragm form a closed space. The amount of gas in the closed space is constant, which can ensure stable sound transmission without interference due to different gas pressures.

[0020] In order to solve the problem that the noise of nuclear magnetic equipment passes through the sound transmission pipe, causing the diaphragm to vibrate and produce sound mixed with noise, the fixing device also includes a noise reduction module, which is electrically connected to the speaker. The noise reduction module emits an anti-phase sound wave corresponding to the noise through the speaker, and the anti-phase sound wave offsets the noise mixed in the gas vibration.

[0021] In this solution, the noise generated by the nuclear magnetic resonance equipment during operation is basically fixed. Therefore, an inverted sound wave signal can be preset in the noise reduction module according to the noise of the nuclear magnetic resonance equipment. The noise reduction module emits an inverted sound wave corresponding to the inverted sound wave signal through a speaker. The inverted sound wave is used to offset the noise, which can reduce the noise transmitted to the patient's ears through the diaphragm, thereby avoiding noise interference with the sound emitted from the speaker.

[0022] Preferably, the noise reduction module includes a sound sensor and a controller, the sound sensor is electrically connected to the controller, the controller is electrically connected to the speaker, the controller generates an inverted sound wave corresponding to the noise through the speaker, the sound sensor is used to collect noise signals, and the controller generates an inverted sound wave signal based on the noise signal collected by the sound sensor.

[0023] In this solution, the anti-phase sound waves generated by the speaker cancel out the noise, reducing the noise transmitted to the patient's ears through the sound transmission tube. When medical staff give instructions to patients through the speaker, the speaker simultaneously emits instructions and anti-phase sound waves. The anti-phase sound waves cancel out the noise, allowing the instructions to be transmitted clearly and accurately to the patient's ears. Setting up a sound sensor to collect environmental noise and generating an anti-phase sound wave signal based on the environmental noise can more accurately cancel out the noise and improve the noise reduction effect.

[0024] In order to solve the problem that noise is directly transmitted to the patient's ears from the gap between the airbag and the patient, causing the noise to interfere with the sound formed at the diaphragm, an annular sound insulation ring is arranged around the diaphragm. The sound insulation ring is used to surround the patient's ears from all sides, block the patient's ears from the outside air, and reduce the transmission of noise from the outside air to the patient's ears.

[0025] In this solution, the sound insulation ring is equivalent to separating the patient's ears from the outside air, playing a sound insulation role, reducing the interference of external noise, and making it easier for the patient to hear the instructions from the speaker.

[0026] Beneficial effects of the present invention:

[0027] The present invention forms a closed space with an air bag and a sound transmission tube, and transmits the sound from the speaker to the diaphragm of the patient's ear through gas vibration in the closed space. After the diaphragm senses the gas vibration, it will also vibrate, thereby generating sound in the patient's ear. The diaphragm is close to the patient's ear, so that the patient can clearly hear the sound from the speaker, so that the patient can cooperate with the examination in a timely and accurate manner according to the instructions of the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments are 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.

[0029] Figure 1 is a top view of the first embodiment;

[0030] Figure 2 It is a right side view of the examination bed, the base of the magnetic resonance head and neck combined coil and the air bag in the first embodiment;

[0031] Figure 3 It is a right side view of the examination bed, the base of the magnetic resonance head and neck combined coil and the air bag in the second embodiment;

[0032] Figure 4 is a cross-sectional view of the airbag, the sound transmission tube and the diaphragm in the fourth embodiment;

[0033] Figure 5 A schematic diagram of a side of the airbag provided with a diaphragm in Embodiment 5;

[0034] Figure 6 It is a cross-sectional view of the airbag, sound transmission tube and diaphragm in the fifth embodiment.

[0035] In the above drawings, the corresponding reference numerals are as follows:

[0036] 1. Airbag; 2. Sound transmission tube; 3. Speaker; 4. Gas pipeline; 5. Gas source; 6. Examination bed; 7. Base of MRI head and neck combined coil; 8. Nuclear magnetic resonance equipment; 9. Diaphragm; 10. Trumpet-shaped opening; 11. Sound insulation ring. DETAILED DESCRIPTION

[0037] In conjunction with the accompanying drawings, the technical solution of the present invention is clearly and completely described through specific implementation methods of the embodiments of the present invention.

[0038] Embodiment 1:

[0039] like Figure 1 As shown, the first embodiment provides a noise-controlled airbag-type MRI head fixation device, including an airbag 1, a sound transmission tube 2, and a speaker 3. One end of the sound transmission tube 2 is connected to the airbag 1, and the gas inside the sound transmission tube 2 is in a flow state with the gas inside the airbag 1. The speaker 3 is connected to the sound transmission tube 2, and the speaker 3 is used to emit sound into the sound transmission tube 2. When the speaker 3 emits sound into the sound transmission tube 2, it causes the gas in the sound transmission tube 2 to vibrate, and the sound is transmitted in the form of air vibration, and the air vibration is transmitted to the airbag 1.

[0040] The airbag 1 is used to abut against the patient's head from the side. Figure 2 As shown, the shape of the airbag 1 can be U-shaped. After being inflated, the U-shaped airbag 1 can clamp the patient's head from both sides to fix the patient's head. A diaphragm 9 is provided at the position of the airbag 1 corresponding to the patient's ear. The gas vibration in the airbag 1 will cause the diaphragm 9 to vibrate, and the vibration of the diaphragm 9 will produce sound. The sound produced by the diaphragm 9 is the same as the sound emitted by the speaker 3. In other words, the sound emitted by the speaker 3 is transmitted to the diaphragm 9 by gas vibration, and the position of the diaphragm 9 is located at the patient's ear, so the patient can clearly hear the sound produced by the diaphragm 9, and can cooperate with the examination according to the sound.

[0041] The airbag 1 is arranged on the examination bed 6, which includes a fixed base and a movable bed surface, and the bed surface of the examination bed 6 can be moved into the nuclear magnetic device 8, so that the patient enters the detection range of the nuclear magnetic device 8. When an examination is required, the examination bed 6 will be completely moved into the nuclear magnetic device 8, so that the patient is brought into the nuclear magnetic device 8 for examination. Figure 1 The arrow direction in the figure is the moving direction of the examination bed 6. A base 7 of a magnetic resonance head and neck combined coil is arranged at the head of the examination bed 6, and the patient's head is located in the base 7 of the magnetic resonance head and neck combined coil. The base 7 of the magnetic resonance head and neck combined coil can be divided into two parts along the radial direction, so that the patient's head can lie in the base 7 of the magnetic resonance head and neck combined coil. In order to facilitate the observation of the position of the airbag 1 in the top view, Figure 1 The base 7 of the MRI head and neck combined coil is in a state where the upper half is removed. The bed surface can be provided with a groove for accommodating the sound transmission tube 2. The sound transmission tube 2 is installed in the groove, which can avoid the bed surface from being cluttered and also avoid the sound transmission tube 2 being pulled by the patient during getting on and off the bed, causing the sound transmission tube 2 to be separated from the airbag 1. The groove can be provided on the top surface or the side surface of the bed surface.

[0042] The purpose of setting the sound transmission tube 2 is to increase the distance between the speaker 3 and the airbag 1, because the diaphragm 9 needs to be located at the patient's ear. During the examination, the patient's head will be located within the inspection range of the nuclear magnetic device 8, so the speaker 3 needs to be away from the airbag 1 to prevent the speaker 3 from being adsorbed by the nuclear magnetic device 8 and affecting the examination. The sound transmission tube 2 can increase the distance between the speaker 3 and the airbag 1, and at the same time ensure that the speaker 3 and the gas inside the airbag 1 are in a gas flow state, so that the sound emitted by the speaker 3 can be transmitted to the diaphragm 9 on the airbag 1 through gas vibration.

[0043] During the MRI examination, the patient lies on an examination bed 6 with the patient's head facing the direction of the MRI device 8. The examination bed 6 can move toward the MRI device 8, so that the patient moves to the examination area of ​​the MRI device 8. The length of the sound transmission tube 2 is greater than the length of the examination bed 6. When the entire examination bed 6 moves to the examination area of ​​the MRI device 8, the speaker 3 is always located outside the examination area of ​​the MRI device 8.

[0044] The function of the loudspeaker 3 is to give a prompt to the patient. The prompt may be a voice message, such as "start holding your breath", "breathe freely" and the like.

[0045] The speaker 3 may be equipped with a recorder, and the speaker 3 plays the sentences recorded by the recorder. The speaker 3 may also be equipped with a microphone, and when the patient needs to cooperate with the examination, the medical staff instructs the patient to act through the microphone, and the speaker 3 plays the instructions spoken by the medical staff. Playing the sentences recorded by the recorder or the sentences transmitted by the microphone through the speaker 3 belongs to conventional technology and will not be described in detail here.

[0046] The premise for the diaphragm 9 to vibrate and produce sound due to the vibration of gas is that the diaphragm 9 is in a taut state. The diaphragm 9 will expand after the airbag 1 is inflated. When the airbag 1 expands to a taut state, the diaphragm 9 on the airbag 1 will also be taut due to the expansion of the airbag 1. Therefore, when using, the airbag 1 can be inflated to make the airbag 1 full of gas and taut, and the diaphragm 9 can be taut.

[0047] It should be noted that a through hole is opened at the position where the diaphragm 9 is provided on the airbag 1 , and a is installed on the through hole. After the diaphragm 9 is connected to the airbag 1 , the through hole is blocked by the diaphragm 9 , and the gas in the airbag 1 is in direct contact with the diaphragm 9 .

[0048] When it is necessary to inflate the airbag 1, a gas pipeline 4 can be provided on the airbag 1, one end of the gas pipeline 4 is connected to the airbag 1, and the other end of the gas pipeline 4 is used to connect to the gas source 5, and the gas output by the gas source 5 enters the airbag 1 along the gas pipeline 4. The gas source 5 can be an air pump, a hand-inflated airbag or a foot-operated air pump, etc. The air pump can use an extruded pipeline gas, and the air pumping method of the air pump is similar to that of a medical high-pressure syringe, which is stable and reliable, requires fewer supporting components, and is easy to use.

[0049] Another embodiment of inflating the airbag 1 can be adopted, that is, the air delivery pipe 4 is connected to the sound transmission pipe 2, so that only one pipe needs to be installed on the airbag 1. The connection between the air delivery pipe 4 and the sound transmission pipe 2 can also shorten the length of the air delivery pipe 4.

[0050] A valve is provided on the gas delivery pipeline 4, and the valve can be closed when the airbag 1 is filled with gas. After the valve is closed, the gas in the airbag 1 cannot be discharged, so that the airbag 1 remains in an expanded state. When the examination is completed, the valve can be opened to release the gas in the airbag 1, so that the airbag 1 no longer clamps the patient's head, so that the patient can leave the examination bed 6.

[0051] The top of the airbag 1 is covered with an isolation towel, which is used to prevent the patient from directly contacting the airbag 1, and to prevent the germs on the patient's body surface from being contaminated on the airbag 1, which may cause cross infection between different patients. After the patient examination is completed, replacing the isolation towel on the top of the airbag 1 can effectively prevent cross infection. In order to prevent the isolation towel from moving, a clip can be set on the top of the airbag 1, and the edge of the isolation towel can be clamped by the clip to fix the isolation towel. Similarly, Velcro can also be set on the surface of the airbag 1, and the isolation towel can be fixed by Velcro.

[0052] Embodiment 2:

[0053] The second embodiment provides a noise-controlled airbag-type MRI head fixation device, which is different from the first embodiment in that: Figure 3 As shown, the second embodiment includes two airbags 1, and the two airbags 1 are used to press against the patient's head from both sides to fix the patient.

[0054] Because the two airbags 1 are located on both sides of the patient's head, when the airbags 1 expand, they will press the patient's head toward the middle, thereby fixing the patient's head.

[0055] A connecting pipe is provided between the two airbags 1, and both ends of the connecting pipe are connected to the two airbags 1 respectively, so as to connect the two airbags 1. When the connecting pipe is provided, it can be ensured that the pressure of the two airbags 1 on the patient's head is the same. When inflating, only one gas delivery pipe 4 is required to inflate the two airbags 1 at the same time.

[0056] Embodiment three:

[0057] The third embodiment of the present invention provides a noise-controlled airbag-type MRI head fixation device. Different from the first embodiment, the third embodiment of the present invention also includes a noise reduction module, which is electrically connected to the speaker 3 and is used to collect noise in the environment. The speaker 3 then emits an inverted sound wave corresponding to the noise, and the inverted sound wave is used to offset the noise, thereby avoiding interference of the noise to the patient.

[0058] The noise reduction module includes a controller and a sound sensor for collecting noise, wherein the sound sensor for collecting noise is a highly sensitive capacitive emplacement microphone. The controller can be a digital signal processor, an analog controller, etc.

[0059] Since the range of the noise sound waves generated by the nuclear magnetic device 8 during operation is fixed, it is also possible not to set a sound sensor, but to preset an anti-phase sound wave signal in the controller and directly generate the anti-phase sound wave through the speaker.

[0060] After the sound sensor collects the noise signal in the environment, the controller generates an inverted sound wave signal according to the noise signal. The controller controls the speaker 3 to emit an inverted sound wave according to the inverted sound wave signal. The inverted sound wave is transmitted in the gas pipeline 4, and will offset the noise entering the gas pipeline 4, thereby achieving the effect of noise reduction, so that no noise will be generated at the diaphragm 9, and the instruction statement transmitted by the speaker 3 is accurate and reliable.

[0061] The third embodiment can also be applied to the second embodiment.

[0062] Embodiment 4:

[0063] The fourth embodiment provides a noise-controlled airbag-type MRI head fixation device. Different from the first embodiment, in the fourth embodiment, the air supply pipe 4 is not connected to the airbag 1 , and the end of the air supply pipe 4 is directly connected to the diaphragm 9 .

[0064] The edge of the diaphragm 9 is fixed to the airbag 1, so that the position of the diaphragm 9 is fixed. Figure 4 As shown, the end of the air pipeline 4 can be set as a trumpet-shaped opening 10, and the trumpet-shaped opening 10 is connected to the diaphragm 9. When the speaker 3 makes a sound, air vibration is generated in the air pipeline 4, and the air vibration is directly transmitted to the diaphragm 9 along the air pipeline 4, causing the diaphragm 9 to vibrate and generate sound.

[0065] The trumpet-shaped opening 10 is made of hard plastic, and the trumpet-shaped opening 10 does not undergo plastic deformation, so that the diaphragm 9 always remains in a taut state. In this case, the state of the diaphragm 9 is independent of the expansion state of the airbag 1 and is not affected by the internal air pressure of the airbag 1.

[0066] The fourth embodiment is also applicable to the second embodiment or the third embodiment.

[0067] Embodiment five:

[0068] The fifth embodiment provides a noise-controlled airbag-type MRI head fixation device. The difference from the first embodiment is that a sound insulation ring 11 is provided on the airbag 1 of the fifth embodiment.

[0069] like Figure 5 and Figure 6 As shown, the position of the sound insulation ring 11 corresponds to the ear, and the diameter of the sound insulation ring 11 is larger than the diaphragm 9, and the diaphragm 9 is located inside the sound insulation ring 11. The function of the sound insulation ring 11 is to surround the ear from all sides, separate the air inside the sound insulation ring 11 from the air outside the sound insulation ring 11, prevent noise from being directly transmitted from the air to the patient's ear, and reduce noise interference.

[0070] The sound insulation ring 11 is a rubber annular protrusion arranged on the surface of the airbag 1. When the airbag 1 presses the patient's head from the side, the annular protrusion will first contact the patient, thereby forming an annular seal at the patient's ear to isolate the air. After the patient's ear is isolated from the outside air, the outside noise heard by the patient can be greatly reduced, making the sound generated by the diaphragm 9 clearer.

[0071] Optionally, the thickness of the side of the airbag 1 close to the patient's head is smaller than that of other positions, and the side of the airbag 1 close to the patient's head is made of elastic material so that the side can be elastically deformed. When the airbag 1 is inflated, if the patient's head is small, the airbag 1 can be deformed toward the patient's head, thereby achieving the effect of pressing the patient's head from the side.

[0072] When the side of the airbag 1 close to the patient's head can be elastically deformed, the thickness of the sound insulation ring 11 is greater than the thickness of the area where it is located, reducing the deformation of the sound insulation ring 11 and ensuring that the sound insulation ring 11 can form a seal. A rigid plastic ring is set at the edge of the diaphragm 9, and the rigid plastic ring will not deform. The diaphragm 9 is fixed to the rigid plastic ring by gluing or sewing. When the diaphragm 9 is fixed, the diaphragm 9 is tightened, thereby ensuring that the diaphragm 9 is in a tight state. The outer ring of the rigid plastic ring is connected to the airbag 1.

[0073] The fifth embodiment is also applicable to the second embodiment, the third embodiment or the fourth embodiment.

[0074] When the fifth embodiment is applied to the third embodiment, the effects of active noise reduction and passive noise reduction can be achieved, wherein the active noise reduction refers to canceling the noise through the noise reduction module, and the passive noise reduction refers to blocking the noise from being transmitted to the patient's ears through the sound insulation ring 11. The active noise reduction and the passive noise reduction work together to improve the noise reduction effect and reduce the impact of noise on the patient.

Claims

1. A noise-controlled airbag-type nuclear magnetic resonance head fixation device, used for fixing a patient's head in a base (7) of a magnetic resonance head and neck combined coil on an examination bed (6), characterized in that: The invention comprises an air bag (1), a sound transmission tube (2) and a loudspeaker (3), wherein the sound transmission tube (2) is connected to the air bag (1), the loudspeaker (3) is arranged in the sound transmission tube (2), the sound transmission tube (2) and the air bag (1) form a closed space, the air bag (1) is provided with a diaphragm (9) at positions corresponding to the ear, the loudspeaker (3) is used to generate vibrations in the gas in the sound transmission tube (2), and transmit sound to the diaphragm (9) through the vibration of the gas, the diaphragm (9) vibrates under the action of the vibration of the gas and generates sound, thereby transmitting the sound to the patient's ear.

2. A noise-controlled airbag-type MRI head fixation device according to claim 1, characterized in that: It also includes an air supply pipeline (4) and an air source (5), one end of the air supply pipeline (4) is connected to the airbag (1), and the other end of the air supply pipeline (4) is connected to the air source (5), and the air source (5) is used to inflate the airbag (1), so that the airbag (1) expands and presses the patient's head from the side, and the internal air pressure of the expanded airbag (1) puts the diaphragm (9) in a taut state.

3. The noise-control airbag-type MRI head fixation device according to claim 1, characterized in that: The device also comprises an air supply pipeline (4) and an air source (5), one end of the air supply pipeline (4) being connected to the sound transmission pipeline (2), and the other end of the air supply pipeline (4) being connected to the air source (5), the air source (5) inflates the airbag (1) through the air supply pipeline (4) and the sound transmission pipeline (2), so that the airbag (1) expands and presses the patient's head from the side, and the internal air pressure of the expanded airbag (1) puts the diaphragm (9) in a tense state.

4. The noise-control airbag-type MRI head fixation device according to claim 1, characterized in that: The airbag (1) is fixed in the base of the magnetic resonance head and neck combined coil, the length of the sound transmission tube (2) is greater than the length of the examination bed (6), and the speaker (3) is arranged at an end of the airbag (1) away from the sound transmission tube (2).

5. The noise-control airbag-type MRI head fixation device according to claim 1, characterized in that: The device comprises two air bags (1), the two air bags (1) are respectively used to abut against two sides of a patient's head, a connecting pipe is provided between the two air bags (1), and the two air bags (1) are connected via the connecting pipe.

6. The noise-control airbag-type MRI head fixation device according to claim 1, characterized in that: An isolation towel is provided on the side of the airbag (1) close to the human body, and the isolation towel is used to isolate the patient's skin from the airbag (1). The isolation towel and the airbag (1) are detachably connected.

7. The noise-control airbag-type MRI head fixation device according to claim 1, characterized in that: The sound transmission tube (2) passes through the airbag (1), the end of the sound transmission tube (2) is connected to the diaphragm (9), the interior of the sound transmission tube (2) and the interior of the airbag (1) are separated by the sound transmission tube (2), and the gas vibration generated by the speaker (3) is transmitted along the interior of the sound transmission tube (2) to the diaphragm (9).

8. The noise-control airbag-type MRI head fixation device according to claim 1, characterized in that: It also includes a noise reduction module, which is electrically connected to the speaker (3). The noise reduction module emits an anti-phase sound wave corresponding to the noise through the speaker (3), and the anti-phase sound wave offsets the noise mixed in the gas vibration.

9. The noise-control airbag-type MRI head fixation device according to claim 8, characterized in that: The noise reduction module comprises a sound sensor and a controller, wherein the controller generates an anti-phase sound wave corresponding to the noise through a speaker (3), the sound sensor is electrically connected to the controller, and the controller is electrically connected to the speaker (3), the sound sensor is used to collect noise signals, and the controller generates an anti-phase sound wave signal according to the noise signal collected by the sound sensor.

10. The noise-control airbag-type MRI head fixation device according to claim 1, characterized in that: An annular sound insulation ring (11) is arranged around the diaphragm (9), and the sound insulation ring (11) is used to surround the patient's ear from all sides, block the patient's ear from the outside air, and reduce the transmission of noise from the outside air to the patient's ear.

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