Head fixation device for nuclear magnetic resonance examinations

Abstract

The application belongs to the field of nuclear magnetic resonance, and particularly relates to a head fixing device suitable for nuclear magnetic resonance examination, which comprises a framework, the framework comprises a fitting part and a fixing belt, the fitting part comprises a fitting ring and a supporting sheet, the two sides of the fitting ring are respectively provided with the supporting sheets, the inner side of the supporting sheet is provided with an ear cover, the ear cover is used for protecting the human ear, the fixing belt is arranged between the two supporting sheets, and the fixing belt is connected with the supporting sheets; and a gasbag supporting assembly, the gasbag supporting assembly comprises a supporting gasbag and an inflation pipe, the inflation pipe is in communication with the supporting gasbag, the supporting gasbags are respectively arranged on the outer sides of the two supporting sheets, and the supporting gasbags are in contact with positioning grooves of a nuclear magnetic resonance examination bed when the supporting gasbags are inflated. The application provides a head fixing device suitable for nuclear magnetic resonance examination, and aims to solve the problem of head movement of a patient in the process of nuclear magnetic resonance examination.

Description

Technical Field

[0001] This invention belongs to the field of nuclear magnetic resonance imaging, and specifically relates to a head fixation device suitable for nuclear magnetic resonance imaging examinations. Background Technology

[0002] In the field of modern medical diagnostics, magnetic resonance imaging (MRI) technology, with its significant advantages such as being radiation-free and having high soft tissue resolution, has become an important tool for detecting internal structures and lesions in the human body. Especially in the diagnosis of head diseases, MRI can clearly visualize the fine structures of the brain, providing doctors with accurate diagnostic information. However, ensuring the patient's head remains absolutely still during a head MRI examination is crucial. Any slight head movement can lead to blurred images and artifacts, severely affecting image quality and thus interfering with the doctor's accurate assessment of the condition.

[0003] Currently, in clinical practice, head fixation during MRI examinations typically involves using a filler (such as foam) to support the head. However, this method has limitations in head fixation, primarily because some patients who are unconscious or have lost consciousness, as well as children with limited self-control, cannot voluntarily control their movements, leading to problems such as blurred images and artifacts during the examination. Summary of the Invention

[0004] This invention provides a head fixation device suitable for magnetic resonance imaging (MRI) examinations, which aims to solve the problem of patient head movement during MRI examinations.

[0005] To achieve the above objectives, the present invention provides a head fixation device suitable for magnetic resonance imaging (MRI) examinations, comprising:

[0006] A frame, comprising a fitting part and a fixing strap, wherein the fitting part includes a fitting ring and a support piece, the inner circle of the fitting ring being shaped to fit the contour of the human face, and support pieces being provided on both sides of the fitting ring, with earmuffs provided on the inner side of each support piece for protecting the human ear; the fixing strap is positioned between the two support pieces and connected to the support pieces; and

[0007] An airbag support assembly includes a support airbag and an inflation tube. The inflation tube is connected to the support airbag. The support airbag is respectively disposed on the outer side of the support plates on both sides. The support airbag inflates and contacts the positioning groove of the MRI examination table.

[0008] In this design, the skeleton is fitted over the patient's head. The supporting airbags in the airbag support assembly then inflate, contacting the positioning slots of the MRI examination table. The supporting airbags on both sides press against the patient's head, thus fixing it in place. This fixation method provides strong head immobility, preventing the patient's head from moving and avoiding problems such as blurriness and artifacts during MRI examinations.

[0009] Preferably, to avoid pressure on the earcups and prevent ear compression, the supporting airbag in this design is ring-shaped, with the earcup corresponding to the inner ring of the supporting airbag. Since the inner ring of the supporting airbag corresponds to the earcup, the earcup will not be compressed after the supporting airbag inflates, thus preventing ear compression.

[0010] Preferably, since the distance between the human face contour and the inner wall of the positioning groove varies, in order to achieve better head fixation, the support airbag in this solution includes multiple sub-airbags arranged in a ring, and each sub-airbag is connected to an inflation tube. This solution achieves better head fixation by allowing different sub-airbags to inflate to different states, filling the space between the human face and the inner wall of the positioning groove.

[0011] Preferably, to solve the problem of interference between sub-airbags, this solution provides a gap between adjacent sub-airbags, the length of which is adapted to the width of the sub-airbag. By providing gaps between the sub-airbags, the expansion position of each sub-airbag is fixed, preventing interference between them.

[0012] Preferably, to control the inflation state of the sub-airbags, the airbag support assembly of this solution further includes an inflation management unit. The inflation management unit is connected to all sub-airbags and is used to control the inflation state of each sub-airbag. This solution controls the inflation state of the sub-airbags through the inflation management unit, ensuring precise inflation of the sub-airbags.

[0013] Preferably, to prevent the inflation management unit from interfering with the MRI examination, the inflation management unit and the inflation tube are detachably connected via a connecting mechanism. Once inflation is complete, the inflation management unit is disconnected from the inflation tube to prevent interference with the MRI examination.

[0014] Preferably, in order to achieve a detachable connection between the inflation tube and the inflation management unit, the connection mechanism of this solution includes a plug and a socket, wherein the socket and the plug correspond to the inflation tube and the inflation management unit respectively, and the plug and the socket can be connected to each other;

[0015] The socket has a horn-shaped connecting tube inside, and the plug has a conical vent tube inside. The conical vent tube and the horn-shaped connecting tube are connected by insertion.

[0016] Preferably, the earcups are equipped with MRI headphones.

[0017] Preferably, the frame further includes a cushioning pad disposed on the inner side of the fitting portion, the height of which is adapted to the height of the earmuff.

[0018] Preferably, in order to accommodate patients with different face shapes, the fitting ring in this solution is constructed with elastic ribs, which are used to adjust the diameter of the fitting ring; the fitting ring is provided with a connecting part, which is used to adjust the diameter of the fitting ring.

[0019] The beneficial effects of this invention are as follows: In this design, the skeleton can be fitted onto the human head, after which the supporting airbags in the airbag support assembly inflate, contacting the positioning groove of the MRI examination table. The supporting airbags on both sides press against the human head, thereby fixing the human head in place. This fixation method provides strong fixation for the human head, preventing the patient's head from moving and avoiding problems such as blurriness and artifacts during MRI examinations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the head fixation device suitable for MRI examination in Example 1.

[0021] Figure 2 This is a front view of the skeleton in Example 1.

[0022] Figure 3 This is a schematic diagram of the earcups in Example 1.

[0023] Figure 4 This is a schematic diagram of the socket in Example 2.

[0024] Figure 5 This is a schematic diagram of the plug in Example 2.

[0025] Figure 6 This is a schematic diagram of the connection between the plug and the socket in Example 2.

[0026] Figure 7 This is a cross-sectional view of the locking structure in Example 2.

[0027] Figure 8 This is a schematic diagram of the plug in Example 3.

[0028] The reference numerals in the attached drawings include: skeleton 1, fitting part 11, fitting ring 111, support piece 112, fixing strap 12, airbag support assembly 2, support airbag 21, inflation tube 22, connecting mechanism 23, plug 231, conical air outlet tube 231a, arc groove 231b, socket 232, horn-shaped connecting tube 232a, locking structure 233, rubber tube 233a, locking block 233b, fixing block 233c, elastic ring 233d, earcup 3, and MRI headphone 31. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0030] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" are defined based on the contours of the corresponding components. Terms such as "first" and "second" used in this disclosure are for distinguishing one element from another and do not imply sequence or importance.

[0031] Example 1

[0032] The basics are as follows: Figure 1 As shown, a head fixation device suitable for MRI examination includes a frame 1 and an airbag support assembly 2. The frame 1 is placed on and adapted to the human head, and the airbag support assembly 2 is adapted to a positioning groove set on the MRI examination table, thereby achieving fixation of the human head.

[0033] like Figure 2As shown, the frame 1 in this embodiment includes a cushioning pad, a fitting part 11, and a fixing strap 12. The fitting part 11 is used to fit the human face, and the fixing strap 12 fixes the fitting part 11. The fitting part 11 specifically includes a fitting ring 111 and a support piece 112. The fitting ring 111 is annular, and its inner ring can be adapted to the contour of the human face. When the fitting ring 111 is fitted onto the human face, the upper part of the fitting ring 111 is located at the human hairline, and the lower part of the fitting ring 111 is located at the human chin. The support piece 112 can be a piece of fabric, and there are two pieces of fabric, which are respectively located on both sides of the fitting ring 111 and are integrally formed with the fitting ring 111. At the same time, the fixing strap 12 is connected between the two support pieces 112, and the fixing strap 12 can be a rectangular strap. The two ends of the fixing strap 12 are connected to the two support pieces 112 by sewing. The fixing strap 12 is internally equipped with an elastic band, which contracts to conform to the back of the head. In addition, for greater comfort, a cotton pad is used as a cushioning pad, positioned inside the fitting ring 111 and the support plate 112. The cushioning pad is secured to the fitting ring 111 and the support plate 112 by sewing. When the frame 1 is placed on the head, the cushioning pad contacts the face, providing cushioning and enhancing comfort when the head is secured.

[0034] The following describes the state of the skeleton 1 when it is placed on the human head: When the skeleton 1 is placed on the human head, the fitting ring 111 is placed on the face, with the upper part of the fitting ring 111 located at the hairline and the lower part at the chin. The support pieces 112 on both sides cover the sides of the face. The fixing strap 12 between the two support pieces 112 is located at the back of the head.

[0035] It should be noted that in this embodiment, when the skeleton 1 is placed on the human head, the top of the human head is exposed, thereby avoiding pressure on the top of the head during subsequent fixation and solving the accidental injury caused by pressure on the top of the head.

[0036] To avoid pressure on the ear, this embodiment also includes an earmuff 3 on the inner side of the support piece 112. The earmuff 3 can be installed to the inner side of the support piece 112 by sewing or gluing. The earmuff 3 is as follows: Figure 3As shown, when the support plate 112 covers the side of the human face, the ear is accommodated inside the earmuff 3. The earmuff 3 can be made of plastic, which has a certain strength and can cover the ear. The earmuff 3 is generally circular, and a circular receiving cavity is provided on the inner side of the earmuff 3 to accommodate the ear and prevent the ear from being squeezed. To facilitate communication between medical staff and patients during MRI examinations, an MRI headset 31 is installed inside the earmuff 3. The MRI headset 31 can emit sound to alleviate noise, and medical staff can also communicate with patients through the MRI headset 31. In addition, to ensure that the earmuff 3 fits the human ear, a silicone layer is provided on the inner side of the earmuff 3. When the silicone layer fits the side of the human face, the silicone layer deforms to fit the contour of the ear, resulting in a better seal.

[0037] To better fit different face shapes, the fitting ring 111 preferably incorporates an elastic rib inside. The deformation of the elastic rib changes the inner diameter of the fitting ring 111. Therefore, when the fitting ring 111 is placed on a person's head, it deforms and conforms to the face, ensuring a proper fit. In addition, the fitting ring 111 has a break point, and a connecting part (not shown in the figure) is provided at the break point. This connecting part can be Velcro. The hook and loop sides of the Velcro are respectively located at both ends of the break point. By attaching the Velcro to different positions, the diameter of the fitting ring 111 can be changed. In this embodiment, when the fitting ring 111 is placed on a person's head, the connecting part and the elastic rib allow the fitting ring 111 to fit the contours of the face more closely, resulting in better fixation.

[0038] To achieve head fixation, such as Figure 1 As shown, the airbag support assembly 2 specifically includes a support airbag 21, an inflation tube 22, and an inflation management unit (not shown in the figure). The support airbag 21 consists of multiple sub-airbags arranged in a ring. The earmuff 3 is correspondingly positioned within the ring of the sub-airbags, ensuring that the sub-airbags do not compress the earmuff 3 after inflation, thus avoiding ear discomfort. Each sub-airbag is also equipped with an inflation tube 22, through which air can be injected to inflate the sub-airbag. When the support airbag 21 is inflated, it contacts the inner wall of the positioning groove on the MRI examination table. The support airbags 21 on both sides work together to support the left and right sides of the face, thereby stabilizing the head.

[0039] To supply air to the sub-inflators and adjust their inflation status, each sub-inflator is connected to the inflation management unit via a corresponding inflation tube 22. The inflation management unit consists of multiple inflation pumps arranged in an array. Different pumps operate to inflate different inflation tubes 22, thereby controlling the inflation status of the different sub-inflators. To avoid the inflation management unit interfering with the MRI examination, it can be located outside the MRI room, extending into the room via the inflation tubes 22 and connected to the sub-inflators.

[0040] It is understandable that, because the distance between different positions on the side of the human face and the inner wall of the positioning groove varies, different amounts of gas are injected into different sub-airbags through the inflation management unit, allowing each sub-airbag to inflate to different degrees. Ultimately, this ensures that the sub-airbags inflate and fit snugly against the inner wall of the positioning groove, thus securing the human head.

[0041] For some patients with wounds on the side of their face, to avoid compressing the wound, the inflation management unit can stop supplying air to the sub-bladder in the wound area, thus preventing the sub-bladder from inflating and compressing the wound. Simultaneously, a protective cover can be installed on the inner wall of the support plate 112, which is adhered to the inner wall of the support plate 112. When inflated, the protective cover encloses the wound area, preventing external pressure on the wound.

[0042] Meanwhile, to avoid interference and compression between the sub-inflators, gaps are left between adjacent sub-inflators. When a sub-inflator inflates, it inflates at the corresponding position, preventing it from compressing other sub-inflators.

[0043] The following detailed description illustrates the specific implementation method: Before the MRI examination, the skeleton 1 is placed over the patient's head. The patient then lies on the MRI examination table with their head positioned within the positioning slot. Next, the support airbags 21 are inflated via the inflation management unit. Once inflated, the support airbags 21 on both sides clamp the patient's head, thus securing it in place.

[0044] In addition, the inflation management unit can adjust the inflation status of different sub-bags according to the different face shapes and wound conditions of different patients.

[0045] Example 2

[0046] The difference between this embodiment and Embodiment 1 is that in this embodiment, the inflation management unit and the inflation tube 22 are detachably connected. When the support airbag 21 needs to be inflated, the inflation management unit is connected to the inflation tube 22; when an MRI scan is performed, the inflation management unit is disconnected from the inflation tube 22 to avoid the inflation management unit interfering with the MRI scan.

[0047] In this embodiment, the inflation management unit and the inflation tube 22 are connected by a connecting mechanism 23. In practice, the support airbags on both sides can each be equipped with a corresponding inflation management unit, and the corresponding inflation management unit and the corresponding inflation tube 22 are connected by the connecting mechanism 23, which facilitates the control and operation of the support airbags.

[0048] like Figure 4 and Figure 5 As shown, the connection mechanism in this embodiment specifically includes a plug 231 and a socket 232. Both the plug 231 and the socket 232 are made of plastic to avoid interference during MRI examinations. The socket 232 is specifically located at the end of the inflation tube 22, while the plug 231 is located at the outlet of the inflation pump. The plug 231 can be inserted into the socket 232 to connect the inflation management unit to the inflation tube 22. The socket 232 contains a flared connecting tube 232a, while the plug 231 contains a conical air outlet tube 231a. Both the flared connecting tube 232a and the conical air outlet tube 231a are made of rigid plastic. The number of conical air outlet tubes 231a and flared connecting tubes 232a is the same, and the number of conical air outlet tubes 231a and flared connecting tubes 232a matches the number of sub-airbags of the corresponding support airbag 21. Meanwhile, the conical vent pipe 231a and the flared connecting pipe 232a are positioned correspondingly to each other, allowing the conical vent pipe 231a to be precisely inserted into the flared connecting pipe 232a, thus achieving a connection between them. Furthermore, both the inner wall of the flared connecting pipe 232a and the outer wall of the conical vent pipe 231a are equipped with sealing rings, ensuring a more airtight connection between them.

[0049] The working state of the connecting mechanism 23 is described below: When inflation is required, the plug 231 is inserted into the socket 232, and the conical air outlet tubes 231a are correspondingly embedded into the flared connecting tubes 232a, thus connecting the conical air outlet tubes 231a and the flared connecting tubes 232a. The gas output from the inflation management unit can be delivered to the inflation tube 22, which then supplies the gas to the support airbag 21. When the support airbag 21 is fully inflated and the plug 231 is withdrawn from the socket 232, the conical air outlet tubes 231a withdraw from the flared connecting tubes 232a, and the conical air outlet tubes 231a and the flared connecting tubes 232a are disconnected.

[0050] To ensure precise insertion of the flared connecting tube 232a and the conical vent tube 231a when the plug 231 and socket 232 are connected, guide planes are provided on the plug 231 and socket 232 respectively. Only when the guide planes are parallel to each other can the plug 231 be precisely inserted into the socket 232, thereby ensuring precise insertion of the flared connecting tube 232a and the conical vent tube 231a and improving practicality.

[0051] like Figures 4-7 As shown, to ensure that the inflation tube 22 does not leak air after the plug 231 and socket 232 are disconnected, this embodiment has a locking structure 233 constructed on the socket 232. The locking structure 233 is used to prevent air leakage from the inflation tube 22 after the plug 231 and socket 232 are disconnected. The locking structure 233 of this embodiment includes a rubber tube 233a, a locking block 233b, a fixing block 233c, and an elastic ring 233d. The rubber tube 233a is disposed between the inflation tube 22 and the flared connecting tube 232a. The number of rubber tubes 233a is the same as the number of flared inflation tubes 232a and the number of inflation tubes 22. The rubber tube 233a enables communication between the inflation tube 22 and the flared connecting tube 232a, and the rubber tube 233a can be squeezed and deformed to achieve closure, and the rubber tube 233a can be released to allow airflow. At the same time, a locking cavity is constructed inside the socket 232, and the rubber tube 233a is located inside the locking cavity. The fixing block 233c is also located inside the locking cavity, and simultaneously contacts one side of all rubber tubes 233a. The fixing block 233c is integrally formed with the socket 232. The locking block 233b is made of plastic, and two locking blocks 233b are provided to fit the rubber tubes 233a on both sides respectively. The locking block 233b is n-shaped, with one end located inside the locking cavity and the other end used to fit with the plug 231. The locking block 233b is telescopically mounted on the socket 232, and can telescopically move, allowing the locking block 233b to contact or separate from the rubber tubes 233a. Meanwhile, the elastic ring 233d can be a rubber ring. The elastic ring 233d is sleeved on the outer surface of the socket 232, and the inner ring of the elastic ring 233d is in contact with the locking block 233b. They can be connected by adhesive to prevent the elastic ring 233d from separating from the locking block 233b.

[0052] The working state of the locking structure 233 is described below: When the plug 231 is inserted into the socket 232, the front end of the plug 231 contacts the locking block 233b, the locking block 233b is held in place by the plug 231, and the locking block 233b moves away from the rubber tube 233a (at this time, the elastic ring 233d is in a deformed state). The rubber tube 233a is open, and airflow can pass through the rubber tube 233a and then into the inflation tube. When the plug 231 is withdrawn from the socket 232, the front end of the plug 231 is no longer in contact with the locking block 233b. The elastic ring 233d in a deformed state drives the locking block 233b to move. The two locking blocks 233b approach the rubber tube 233a. The two locking blocks 233b and the fixing block 233c cooperate to clamp the rubber tube 233a. The rubber tube 233a is deformed and sealed, and the gas will not leak from the rubber tube.

[0053] To improve the sealing effect of the locking block 233b and the fixing block 233c on the rubber tube 233a, it is preferable to provide a fixing groove on the fixing block 233c, which is wavy in shape. The fixing groove is provided corresponding to the locking block 233b, and the locking block 233b can also be provided with a fixing protrusion, which is also wavy in shape and matches the fixing groove. When the elastic ring 233d drives the locking block 233b to contact the rubber tube 233a, the locking block 233b drives the rubber tube 233a to be recessed into the fixing groove. The rubber tube 233a is wavy inside the U-shaped groove, resulting in a better sealing effect for the rubber tube 233a.

[0054] To further enhance the locking force of the locking block 233b and the fixing block 233c on the rubber tube 233a, in some embodiments, a locking rib made of elastic material can be connected between the locking block 233b and the fixing block 233c. The locking rib is bonded to the locking block 233b and the fixing block 233c. When the locking block 233b and the fixing block 233c move away from each other, the locking rib is in a stretched state. After the plug 231 and the socket 232 separate, the deformation of the locking rib causes the locking block 233b and the fixing block 233c to move closer, clamping and sealing the rubber tube 233a. In this embodiment, the locking block 233b achieves the sealing of the rubber tube 233a under the combined action of the locking rib and the elastic ring 233d, resulting in a better sealing effect for the rubber tube 233a.

[0055] Example 3

[0056] This embodiment is an improvement on embodiment 2, such as... Figure 8As shown, to ensure a more stable connection between the socket 232 and the plug 231, an arc-shaped groove 231b can be provided on the outer surface of the plug 231. The arc-shaped groove 231b is used to mate with one end of the locking block 233b. Therefore, when the plug 231 is inserted into the groove 232, the locking block 233b engages with the arc-shaped groove 231b. The locking block 233b and the arc-shaped groove 231b mutually limit and adapt to each other, thereby locking the plug 231 and the socket 232.

[0057] In this embodiment, the locking block 233b serves as both a locking plug 231 and a locking rubber tube 233a, making it more practical.

[0058] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A head fixation device suitable for magnetic resonance imaging (MRI) examination, characterized in that: include A skeleton, comprising a fitting part and a fixing strap, wherein the fitting part includes a fitting ring and support pieces, the fitting ring being annular, the inner shape of which conforms to the contour of the human face, and support pieces, each made of fabric, being provided on both sides of the fitting ring; earmuffs are provided on the inner side of the support pieces to protect the human ears; the fixing strap is positioned between the two support pieces and connected to them, and the fixing strap contains an elastic band that contracts to fit snugly against the back of the head; and An airbag support assembly includes an inflation management unit, a support airbag, and an inflation tube. The inflation tube is connected to the support airbag. The support airbag is respectively disposed on the outer side of the support plates on both sides. The inflated support airbag contacts the positioning groove of the MRI examination table. The support airbag includes multiple sub-airbags, each connected to an inflation tube. An inflation management unit is connected to all sub-airbags to control the inflation state of each sub-airbag. The inflation management unit and the inflation tube are detachably connected via a connecting mechanism, which includes a plug and a socket. The plug and socket correspond to the inflation tube and the inflation management unit, respectively, and can be connected to each other. A flared connecting tube is located inside the socket, and a conical air outlet tube is located inside the plug. The conical air outlet tube and the flared connecting tube are connected together. The socket has a locking structure to prevent air leakage from the inflation tube after the plug and socket are disconnected. The locking structure includes a rubber tube, a locking block, a fixing block, and an elastic ring. The rubber tube is positioned between the inflation tube and the flared connecting tube. The rubber tube connects the inflation tube and the flared connecting tube, and can be compressed and deformed to achieve a seal, or released to allow airflow. The socket has an internal locking cavity, where the rubber tube is located. The fixing block is located inside the locking cavity and simultaneously contacts one side of all the rubber tubes. There are two locking blocks, each designed to fit the rubber tubes on both sides. One end of the locking block is located inside the locking cavity, and the other end is used to fit the plug. The locking block is telescopically mounted on the socket, allowing it to contact or separate from the rubber tube. The elastic ring is fitted onto the outer surface of the socket, with its inner ring contacting the locking block and connected by adhesive. When the skeleton is fitted onto the human head, the fitting ring is placed on the face, with the upper part of the fitting ring at the hairline and the lower part at the chin; the support plates on both sides cover the sides of the face; the fixing strap between the two support plates is located at the back of the head, and the top of the head is exposed.

2. The head fixation device according to claim 1, characterized in that: The support airbag is arranged in a ring shape, and the earmuff corresponds to the inner ring of the support airbag.

3. The head fixation device according to claim 2, characterized in that: The sub-airbags are arranged in a ring.

4. The head fixation device according to claim 3, characterized in that: A gap is provided between adjacent sub-airbags, and the length of the gap is adapted to the width of the sub-airbag.

5. The head fixation device according to claim 1, characterized in that: The earcups are equipped with MRI headphones.

6. The head fixation device according to claim 1, characterized in that: The frame also includes a cushioning pad, which is disposed on the inner side of the fitting portion, and the height of the cushioning pad is adapted to the height of the earmuff.

7. The head fixation device according to claim 1, characterized in that: The fitting ring is constructed with elastic ribs, which are used to adjust the diameter of the fitting ring; And / or, The fitting ring is provided with a connecting part, which is used to adjust the diameter of the fitting ring.

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