Communication noise reduction earphone for nuclear magnetic resonance examination

Abstract

The invention discloses a communicable noise reduction earphone for nuclear magnetic resonance examination, and belongs to the noise reduction earphone technology. The noise reduction earphone comprises an earphone body made of a non-magnetic material, and the structure of the earphone body is as follows: a noise reduction earmuff comprises a pair of earmuff shells and ear pads installed at the inner sides of the earmuff shells; one swinging sound guide tube is fixed on each earmuff shell in a transverse penetrating manner; the lower end part of each connecting sound guide tube is an arc-shaped tube, and the outer end part of each swinging sound guide tube is connected with the lower end part of one connecting sound guide tube in a sealing and sleeving manner; and the three-way sound guide tube is an inverted T-shaped sound guide tube, the upper port of the three-way sound guide tube is a vertically upward sound guide access port, and the lower port of the three-way sound guide tube is a left sound guide access port and a right sound guide access port which are horizontally symmetrical. The noise reduction earphone is designed and manufactured by adopting a non-magnetic material, machine operation noise heard by a patient can be reduced during nuclear magnetic resonance examination, and a doctor can conduct external sound into the earphone to be heard by the patient.

Description

Technical Field

[0001] The invention relates to a communication noise reduction earphone for nuclear magnetic resonance examination, belonging to the technical field of noise reduction earphones. Background Art

[0002] During a nuclear magnetic resonance (MRI) examination, the machine will make a loud noise. This noise is caused by the rapid switching of the gradient magnetic field. This noise may make the patient feel nervous and anxious. At the same time, in order to ensure the smooth progress of the examination, the doctor also needs to remind the patient to maintain the correct and unchanged body position. During the examination, the slight movement of the patient's body may cause the image to be blurred and affect the accuracy of the examination results. If the patient shows signs of movement, the doctor needs to remind the patient to restore the required body position in time. In order to relieve the patient's nervousness and anxiety and remind the patient to maintain the correct and unchanged examination position, the doctor currently mainly relies on the intercom to shout to the patient. On the one hand, the patient can be told that these noises are normal and comfort and relieve the patient's nervousness; on the other hand, the patient can be guided to maintain the correct and unchanged examination position. When the patient moves and affects the imaging quality, the patient is reminded to correct the position in time. However, due to the very loud noise of the machine, the patient is in a small and closed scanning hole at this time, and it is difficult to hear the doctor's voice clearly.

[0003] At present, in order to relieve patients' nervousness and anxiety, patients are generally given earmuffs made of non-magnetic materials for noise reduction to reduce the impact of noise on patients' emotions, but non-metallic earmuffs currently have no communication function. Existing ordinary noise-cancelling headphones with communication functions cannot be used during MRI examinations because they contain electronic components. On the one hand, electronic components will interfere with the uniformity of the magnetic field in the scanning hole, which may cause damage to the image quality, such as imaging artifacts, signal loss or deformation, which will ultimately affect the accuracy of the examination results. On the other hand, the magnetic field in the scanning hole will also interfere with the communication signal of ordinary noise-cancelling headphones, making it impossible to play the sound normally.

[0004] Therefore, a non-metallic noise reduction headset that can be used during MRI examination is designed, which has a communication function. It can not only reduce noise, but also enable patients to perfectly cooperate with the doctor's instructions and maintain the clarity of the examination image. It can also play soothing music to relieve the patient's tension and anxiety. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a communication and noise reduction headset for nuclear magnetic resonance examination, which solves the problem that communication headsets cannot be used during nuclear magnetic resonance examination.

[0006] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0007] A communication noise reduction headset for magnetic resonance imaging, comprising a headset body made of non-magnetic material, the headset body structure is as follows:

[0008] A noise reduction earmuff, comprising a pair of earmuff shells, and ear pads mounted on the inner sides of the earmuff shells;

[0009] A swinging sound guide tube, wherein each earmuff shell has a swinging sound guide tube fixedly disposed across it, an earplug that matches the external auditory canal being fixedly disposed at the inner end of the swinging sound guide tube, and the outer end of the swinging sound guide tube is an arc-shaped tube;

[0010] Connecting sound guide tubes, the lower end of the connecting sound guide tubes is an arc-shaped tube, the outer end of each swinging sound guide tube is sealed and sleeved with the lower end of a connecting sound guide tube, and the contact surface of the sleeves of the two is coated with a shock-absorbing rubber layer, the upper ends of the left and right connecting sound guide tubes are symmetrically bent toward the middle and are horizontally oriented, and the sleeve joint between the outer end of the swinging sound guide tube and the lower end of the connecting sound guide tube is provided with a swing limit assembly for limiting the swing angle and preventing rotation;

[0011] A three-way sound-conducting tube is an inverted T-shaped sound-conducting tube, wherein the upper port is a sound-conducting inlet pointing vertically upward, and the lower port is two horizontally symmetrical left and right sound-conducting outlets, which are respectively sealed and sleeved with the upper ends of the left and right connecting sound-conducting tubes, and a shock-absorbing rubber layer is coated on the contact surfaces of the sleeves of the two. A translation limit assembly for limiting the telescopic length and preventing rotation is provided at the sleeve joint between the sound-conducting outlet and the upper ends of the connecting sound-conducting tubes.

[0012] Preferably, the swinging sound-conducting tube, the connecting sound-conducting tube and the three-way sound-conducting tube are all made of double-layer vacuum glass tubes, and the interlayer of the double-layer vacuum glass tube is evacuated to form a vacuum sound-proof cavity.

[0013] Preferably, the outer port of the inner tube of the swing sound guide tube adopts a trumpet shape that is larger on the outside and smaller on the inside.

[0014] Preferably, the inner and outer surfaces of the double-layer vacuum glass tube are coated with a shock-absorbing rubber layer.

[0015] Preferably, the swing limit assembly includes a swing seat fixed to the lower part of the connecting sound guide tube, and a swing ear hole fixed to the outside of the earmuff shell, the swing ear hole is hinged to the swing seat, a first limit column is arranged on the swing ear hole, and an arc hole matching with the first limit column is arranged on the swing seat, the center of the arc hole, the rotation center of the earmuff shell, the center of the arc tube at the outer end of the swing sound guide tube and the center of the arc tube at the lower end of the connecting sound guide tube all coincide, when the earmuff shell and the swing sound guide tube rotate together, the first limit column is restricted to rotate at a limited angle in the arc hole, at this time, the outer end of the swing sound guide tube and the lower end of the connecting sound guide tube always maintain a closed socket state.

[0016] Preferably, the translation limit assembly includes a translation seat fixed on the three-way sound guiding tube, and a limit sleeve fixed on the upper end parts of the left and right connecting sound guiding tubes respectively, the translation seat is provided with a horizontal slide groove, a limited long hole is opened on the side of the slide groove, a tensioning rod is provided on the upper part of the limit sleeve, a sliding block inserted into the slide groove is provided on the lower part of the limit sleeve, a second limit column is provided on the side of the sliding block, and the second limit column is restricted to move a limited distance in the limited long hole. At this time, the upper end part of the connecting sound guiding tube and the sound guiding outlet end of the three-way sound guiding tube always maintain a closed sleeve state, and the two tensioning rods on the upper parts of the left and right limit sleeves are bound and connected by a non-metallic elastic member.

[0017] Preferably, the translation limit assembly is wrapped in a cylindrical noise reduction and sound insulation cotton.

[0018] Preferably, it also includes a sound-generating device and a conduction tube, wherein the sound-generating device includes a shielded noise reduction box and an audio player built in the shielded noise reduction box, wherein the audio player is electrically connected to the console via a shielded wire, wherein the console controls the audio player to play a specific audio signal, and the sound collector is connected to the sound guide access port of the three-way sound guide tube via the conduction tube. The sound-generating device containing electronic components needs to be away from the scanning hole of the nuclear magnetic resonance, and the sound vibration is transmitted to the sound guide access port of the headset via the conduction tube coated with noise reduction and sound insulation cotton.

[0019] The beneficial effects of the present invention are: the noise-reducing headphones are designed and manufactured using non-magnetic materials, which can reduce the machine operation noise heard by the patient during the MRI examination, and the doctor can conduct external sounds into the headphones to be heard by the patient; the doctor can play soothing music through the headphones to relieve the patient's tension; the doctor can use the headphones to guide the patient to maintain the correct examination posture, which is conducive to the smooth progress of the MRI examination. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention when applied to nuclear magnetic resonance examination;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention installed on a nuclear magnetic resonance examination bed;

[0022] Figure 3 It is a schematic diagram of the structure of the earphone body and the sound source part;

[0023] Figure 4 It is a structural principle block diagram of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the earphone body of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the earphone body of the present invention worn on the patient's head;

[0026] Figure 7 This is a schematic diagram of the structure inside the earphone body of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the translation limit assembly;

[0028] Fig. 9 It is a structural schematic diagram of the swing limit assembly;

[0029] Fig.10 Schematic diagram of the swinging sound guide tube structure made for double-layer vacuum soundproof glass.

[0030] In the figure: 1. earphone body; 101. external auditory canal; 102. vacuum sound insulation cavity; 103. noise reduction sound insulation cotton; 104. bell mouth; 11. noise reduction earmuffs; 111. earmuff shell; 112. ear pads; 12. swing sound guide tube; 121. earplug; 13. connecting sound guide tube; 14. shock-absorbing rubber layer; 15. swing limit assembly; 151. swing seat; 152. swing ear hole; 153. first limit column; 154. arc hole; 16. three-way sound guide tube; 161. sound guide inlet; 162. sound guide outlet; 1 7. Translation limit assembly; 171. Translation seat; 172. Limit sleeve; 173. Horizontal slide groove; 174. Limit long hole; 175. Tension rod; 176. Sliding block; 177. Second limit column; 178. Non-metallic elastic part; 2. Sound-generating device; 21. Shielded noise reduction box; 22. Audio player; 23. Shielded wire; 24. Sound collector; 3. Conducting tube; 4. Control console; 5. Double-layer vacuum glass tube 6. Magnetic resonance imaging equipment; 601. Examination bed; 602. Translation drive platform; 603. Scanning hole. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0032] The "inner side" and "inner end" mentioned in this article refer to the side and end close to the human body, and the "outer side" and "outer end" refer to the side and end away from the human body. After wearing the earphones, the three-way sound guide tube of the earphones is the "upper end", the noise reduction earmuffs are the "lower end", "left and right" refer to the left and right sides of the earphones, and "middle" refers to the symmetrical central axis of the left and right earmuffs.

[0033] like Figure 1-Figure 3As shown, the nuclear magnetic resonance examination device 6 includes an examination bed 601 and a translation drive platform 602 for sending the examination bed 601 into a scanning hole 603. When a patient enters a nuclear magnetic resonance examination room, he needs to lie on the examination bed 601. The communication noise reduction headset for nuclear magnetic resonance examination is installed in the patient's head area on the examination bed 601. The communication noise reduction headset for nuclear magnetic resonance examination includes a headset body 1 made of non-magnetic material.

[0034] like Figure 4-Figure 9 As shown, the structure of the earphone body 1 is as follows:

[0035] The noise reduction earmuff 11 comprises a pair of earmuff shells 111 and ear pads 112 installed inside the earmuff shells 111. The earmuff shells 111 are made of non-magnetic plastic, the ear pads 112 are made of non-magnetic noise reduction and sound insulation cotton 103, and the surface of the noise reduction and sound insulation cotton 103 is covered with non-magnetic leather material.

[0036] A swinging sound guide tube 12 is fixed across each earmuff shell 111, an earplug 121 matching the external auditory canal 101 is fixed to the inner end of the swinging sound guide tube 12, and the outer end of the swinging sound guide tube 12 is an arc-shaped tube.

[0037] In order to adapt to the external auditory canals 101 of different shapes and sizes of different patients, the headset is equipped with a plurality of earplugs 121 of different lengths and sizes, so that the earplug 121 that is compatible with the patient's external auditory canal 101 can be found to achieve a better sound insulation effect.

[0038] The connecting sound guide tube 13 has a lower end which is an arc-shaped tube. The outer end of each swinging sound guide tube 12 is sealed and sleeved with the lower end of a connecting sound guide tube 13. The contact surface of the sleeve is coated with a shock-absorbing rubber layer 14. The upper ends of the left and right connecting sound guide tubes 13 are symmetrically bent toward the middle and are horizontally oriented. The sleeve joint between the outer end of the swinging sound guide tube 12 and the lower end of the connecting sound guide tube 13 is provided with a swing limiting component 15 for limiting the swing angle and preventing rotation.

[0039] The three-way sound-conducting tube 16 is an inverted T-shaped sound-conducting tube, the upper end of which is a sound-conducting inlet 161 pointing vertically upward, and the lower end is two horizontally symmetrical left and right sound-conducting outlets 162. The left and right sound-conducting outlets 162 are respectively sealed and sleeved with the upper ends of the left and right connecting sound-conducting tubes 13, and the contact surfaces of the sleeves are coated with a non-magnetic shock-absorbing rubber layer 14. The sleeve joint between the sound-conducting outlet 162 and the upper end of the connecting sound-conducting tube 13 is provided with a translation limit assembly 17 for limiting the telescopic length and preventing rotation.

[0040] The swing sound guide tube 12, the connecting sound guide tube 13 and the three-way sound guide tube 16 are made of non-magnetic plastic, glass, ceramic and other materials. The swing limit assembly 15 and the translation limit assembly 17 are made of non-magnetic plastic.

[0041] In order to reduce the impact of environmental noise on the internal communication sound of the headset and improve the sound insulation effect of the headset:

[0042] The swinging sound guide tube 12 , the connecting sound guide tube 13 , and the three-way sound guide tube 16 all adopt double-layer vacuum glass tubes 5 , and the interlayer of the double-layer vacuum glass tubes 5 is evacuated to form a vacuum sound insulation cavity 102 .

[0043] In order to focus and enhance the sound in the pipe, a sound enhancement structure is designed at the end of the earphone communication:

[0044] like Fig.10 As shown, the outer end of the inner tube of the swing sound guide tube 12 is in the shape of a bell mouth 104 which is larger on the outside and smaller on the inside.

[0045] Direct connection between the double-layer vacuum glass tubes 5 will cause gaps and collisions, which will weaken the sound insulation effect. In order to reduce the sealing and soft contact of the two glass tubes, a flexible coating layer is designed:

[0046] The inner and outer surfaces of the double-layer vacuum glass tube 5 are covered with a shock-absorbing rubber layer 14 .

[0047] In order to solve the problem that the double-layer vacuum glass tube 5 is not bendable, which makes the headset difficult to adapt to different patients, the following solution is designed to mainly solve the following two problems:

[0048] a. In order to improve the wearing comfort of the earmuffs for different patients, a swing limiter assembly 15 with a tubular connection structure is designed. The swing sound guide tube 12 has an arc-shaped outer end which is sleeved with the lower end of the connecting sound guide tube 13 which is also an arc-shaped tube. Under the restriction of the swing limiter assembly 15, the swing can be realized to fit the wearer's ear more closely.

[0049] At the same time, in order to prevent the swing from exceeding the limit and causing the sleeve joint to separate, the swing angle of the earmuff and the swing sound guide tube 12 should be limited and prevented from rotating randomly. Therefore, the following swing limit assembly 15 is designed:

[0050] The swing limiting assembly 15 includes a swing seat 151 fixed to the lower part of the connecting sound guide tube 13, and a swing ear hole 152 fixed to the outer side of the earmuff shell 111. The swing ear hole 152 is hinged to the swing seat 151. A first limiting column 153 is arranged on the swing ear hole 152. An arc hole 154 cooperating with the first limiting column 153 is arranged on the swing seat 151. The center of the arc hole 154, the rotation center of the earmuff shell 111, the center of the arc tube at the outer end of the swing sound guide tube 12 and the center of the arc tube at the lower end of the connecting sound guide tube 13 all coincide. When the earmuff shell 111 and the swing sound guide tube 12 rotate together, the first limiting column 153 is restricted to rotate at a limited angle in the arc hole 154. At this time, the outer end of the swing sound guide tube 12 and the lower end of the connecting sound guide tube 13 always maintain a closed sleeve state. A swing limiting assembly 15 is disposed on each earmuff shell 111 , and the two swing limiting assemblies 15 are symmetrically designed about the symmetry axis of the earphone.

[0051] b. In order to adapt to patients with different head circumferences, a translation limiter assembly 17 is designed to adjust the width of the earphone. In addition, in order to prevent the translation adjustment from exceeding the limit and causing the sleeve to separate, the telescopic length of the connecting sound guide tube 13 should be limited to prevent random rotation. Therefore, the following translation limiter assembly 17 is designed:

[0052] The translation limit assembly 17 includes a translation seat 171 fixed on the three-way sound guide tube 16, and a limit sleeve 172 respectively fixed on the upper ends of the left and right connecting sound guide tubes 13. The translation seat 171 is provided with a horizontal slide 173, and a limited long hole 174 is provided on the side of the slide. A tension rod 175 is provided on the upper part of the limit sleeve 172, and a slider 176 inserted into the slide is provided on the lower part of the limit sleeve 172. A second limit column 177 is provided on the side of the slider 176. The second limit column 177 is limited to move a limited distance in the limit long hole 174. At this time, the upper end of the connecting sound guide tube 13 and the sound guide outlet 162 of the three-way sound guide tube 16 are always kept in a closed sleeve state, and the two tension rods 175 on the upper parts of the left and right limit sleeves 172 are bound and connected by a non-metallic elastic member 178. The structure of the translation limit assembly 17 is designed symmetrically with the symmetry axis of the three-way sound guide tube 16.

[0053] Under the pressure of the non-metallic elastic member 178 (eg, a rubber band) of the translation limiting assembly 17, the ear pad 112 and the earplug 121 are respectively tightly pressed against the periphery of the ear and the inside of the ear hole, thereby achieving a better sound insulation effect.

[0054] In order to further improve the noise reduction effect and prevent the internal structure from being exposed and damaged by collision.

[0055] The translation limiting assembly 17 is wrapped in a cylindrical non-magnetic noise reduction and sound insulation cotton 103.

[0056] The earmuff shell 111 fixes the swinging sound guide tube 12 through the shock-absorbing rubber layer 14, the swing seat 151 is fixed to the lower part of the connecting sound guide tube 13 through the shock-absorbing rubber layer 14; the translation seat 171 is fixed to the three-way sound guide tube 16 through the shock-absorbing rubber layer 14; the limiting sleeve 172 is fixed to the upper ends of the left and right connecting sound guide tubes 13 through the shock-absorbing rubber layer 14. The shock-absorbing rubber layer 14 has a good shock-absorbing effect and can reduce the vibration conduction between the components.

[0057] In order to generate sound sources that can be transmitted to this headset, the following sound source generation method is designed:

[0058] It also includes a sound-generating device 2 and a conducting tube 3. The conducting tube 3 is made of non-magnetic plastic, glass, ceramic and other materials. The sound-generating device 2 includes a shielded noise reduction box 21 and an audio player 22 built in the shielded noise reduction box 21. The audio player 22 is electrically connected to the console 4 through a shielded wire 23. The console 4 controls the audio player 22 to play a specific audio signal. The sound collector 24 is connected to the sound guide port 161 of the three-way sound guide tube 16 through the conducting tube 3. The sound-generating device 2 containing electronic components needs to be away from the scanning hole of the nuclear magnetic resonance, and the sound vibration is transmitted to the sound guide port 161 of the headset through the conducting tube 3 coated with non-magnetic noise reduction and sound insulation cotton 103. Although the generator is away from the nuclear magnetic resonance scanning hole and will not affect the inspection results, there is still a strong magnetic field in the inspection room. Therefore, the audio player 22 and the console 4 need to be electrically connected using a shielded wire 23. The shielded wire 23 can also achieve reliable communication in a strong magnetic field. The use of wires with a metal shielding layer can effectively reduce the interference of the external magnetic field on the internal signal.

[0059] How to use this headset during an MRI examination:

[0060] (1) Before the examination, in addition to maintaining the existing necessary operations before the examination, the patient is also helped to wear the headset, which can adapt to the shape of different patients' heads through the self-adjustment of the swing limit component 15 and the translation limit component 17. At this time, the headset can not only soundproof and reduce the huge noise generated by the nuclear magnetic resonance examination equipment 6, but also play soothing music through the headset to soothe the patient's nervous mood.

[0061] (2) During the examination, the MRI examination device 6 will start to transport the examination bed 601 into the scanning hole 603 through the translation drive platform 602 to start the MRI scan. At this time, if the patient's body position does not meet the examination requirements, the music can be paused, and the doctor can speak through the microphone on the console 4 and play it through the audio player 22 to ask the patient to cooperate in adjusting the body position so that the doctor can complete the MRI examination efficiently and accurately.

[0062] (3) After the examination, help the patient take off the headphones.

[0063] The advantage of this headset over existing headsets is that it is designed and made of non-magnetic materials, which can reduce the machine operation noise heard by patients during MRI examinations, and the doctor can transmit external sounds into the headset to be heard by the patient; the doctor can play soothing music through this headset to relieve the patient's tension; the doctor can use this headset to guide the patient to maintain the correct examination position, which is conducive to the smooth progress of the MRI examination.

[0064] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A communication noise-cancelling headset for magnetic resonance imaging, characterized in that: It includes an earphone body made of non-magnetic material, and the structure of the earphone body is as follows: A noise reduction earmuff, comprising a pair of earmuff shells, and ear pads mounted on the inner sides of the earmuff shells; A swinging sound guide tube, wherein each earmuff shell has a swinging sound guide tube fixedly disposed across it, an earplug that matches the external auditory canal being fixedly disposed at the inner end of the swinging sound guide tube, and the outer end of the swinging sound guide tube is an arc-shaped tube; Connecting sound guide tubes, the lower end of the connecting sound guide tubes is an arc-shaped tube, the outer end of each swinging sound guide tube is sealed and sleeved with the lower end of a connecting sound guide tube, and the contact surface of the sleeves of the two is coated with a shock-absorbing rubber layer, the upper ends of the left and right connecting sound guide tubes are symmetrically bent toward the middle and are horizontally oriented, and the sleeve joint between the outer end of the swinging sound guide tube and the lower end of the connecting sound guide tube is provided with a swing limit assembly for limiting the swing angle and preventing rotation; A three-way sound-conducting tube is an inverted T-shaped sound-conducting tube, wherein the upper port is a sound-conducting inlet pointing vertically upward, and the lower port is two horizontally symmetrical left and right sound-conducting outlets, which are respectively sealed and sleeved with the upper ends of the left and right connecting sound-conducting tubes, and a shock-absorbing rubber layer is coated on the contact surfaces of the sleeves of the two. A translation limit assembly for limiting the telescopic length and preventing rotation is provided at the sleeve joint between the sound-conducting outlet and the upper ends of the connecting sound-conducting tubes.

2. The communication noise-cancelling headset for magnetic resonance imaging according to claim 1, characterized in that: The swinging sound-conducting tube, the connecting sound-conducting tube and the three-way sound-conducting tube all adopt double-layer vacuum glass tubes, and the interlayer of the double-layer vacuum glass tube forms a vacuum sound-insulating cavity after being evacuated.

3. The communication noise-cancelling headset for magnetic resonance imaging according to claim 2, characterized in that: The outer port of the inner tube of the swing sound guide tube adopts a trumpet shape with a larger outer side and a smaller inner side.

4. The communication noise-cancelling headset for magnetic resonance imaging according to claim 2, characterized in that: The inner and outer surfaces of the double-layer vacuum glass tube are covered with shock-absorbing rubber layers.

5. The communication noise-cancelling headset for magnetic resonance imaging according to claim 2, characterized in that: The swing limiting assembly includes a swing seat fixed to the lower part of the connecting sound guide tube, and a swing ear hole fixed to the outer side of the earmuff shell, the swing ear hole is hinged to the swing seat, a first limiting column is arranged on the swing ear hole, and an arc hole matched with the first limiting column is arranged on the swing seat, the center of the arc hole, the rotation center of the earmuff shell, the center of the arc tube at the outer end of the swing sound guide tube and the center of the arc tube at the lower end of the connecting sound guide tube all coincide, when the earmuff shell and the swing sound guide tube rotate together, the first limiting column is restricted to rotate at a limited angle in the arc hole, at this time, the outer end of the swing sound guide tube and the lower end of the connecting sound guide tube always maintain a closed sleeve state.

6. The communication noise-cancelling headset for magnetic resonance imaging according to claim 2, characterized in that: The translation limit assembly includes a translation seat fixed on the three-way sound guiding tube, and a limit sleeve respectively fixed to the upper ends of the left and right connecting sound guiding tubes. The translation seat is provided with a horizontal slide groove, and a limited long hole is opened on the side of the slide groove. A tension rod is provided on the upper part of the limit sleeve, and a slider inserted into the slide groove is provided on the lower part of the limit sleeve. A second limit column is provided on the side of the slider. The second limit column is restricted to move a limited distance in the limit long hole. At this time, the upper end of the connecting sound guiding tube and the sound guiding outlet end of the three-way sound guiding tube are always kept in a closed sleeve state, and the two tension rods on the upper parts of the left and right limit sleeves are bound and connected by a non-metallic elastic member.

7. The communication noise-cancelling headset for magnetic resonance imaging according to claim 6, characterized in that: The translation limiting assembly is wrapped in a cylindrical noise reduction and sound insulation cotton.

8. The communication noise reduction headset for magnetic resonance imaging according to claim 1, characterized in that: It also includes a sound-generating device and a conductive tube. The sound-generating device includes a shielded noise reduction box and an audio player built into the shielded noise reduction box. The audio player is electrically connected to a console via a shielded wire. The console controls the audio player to play a specific audio signal. The sound collector is connected to the sound access port of the three-way sound conduit via the conductive tube.

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