A positioning device for magnetic resonance imaging of the head

Abstract

This invention relates to the field of magnetic resonance imaging (MRI) technology, specifically providing an MRI positioning device suitable for the head. This invention abandons the traditional one-piece airbag structure, employing a design with multiple pneumatic clamping components distributed on both sides inside the headgear, in conjunction with a head-fixing airbag. Pneumatic drive enables adaptive movement of the airbag mounting plate. Combined with airbag inflation, it can specifically conform to the protruding and concave areas of different patients' heads, overcoming the shortcomings of traditional one-piece airbags that cannot adapt to diverse head shapes. This significantly improves the fit and stability of head fixation, preventing slight head movements from affecting MRI image quality.

Description

Technical Field

[0001] This invention relates to the field of magnetic resonance imaging technology, specifically to a magnetic resonance imaging positioning device applicable to the head. Background Technology

[0002] The core principle of magnetic resonance imaging (MRI) is to use a radio frequency magnetic field to excite hydrogen protons in the human body to resonate, and then receive the radio frequency signals released during the proton relaxation process. After computer processing, an image of the human body structure is reconstructed. As the core hardware for realizing this technology, the performance of the radio frequency coil directly determines the quality of MRI imaging, scanning efficiency, and clinical applicability.

[0003] Because the body radio frequency coil is far from the patient's body, it is difficult to obtain a high signal-to-noise ratio, which cannot meet the requirements for accurate imaging. Therefore, local coils for different parts of the body have emerged, such as head coils (head and neck coils), spine coils, abdominal coils, and lower limb coils. These local coils are mostly radio frequency receiving coils, which can be directly wrapped around the corresponding parts of the body during scanning. Because they are closer to the scanning area, they can significantly improve the signal-to-noise ratio and ensure high-quality imaging.

[0004] In head MRI scans, current procedures typically require the patient to place a head pillow within the groove of the head coil, followed by the inflation of an airbag to fill the gap between the head and the groove, thus achieving head fixation. However, most airbags currently used are one-piece structures, exhibiting significant adaptation limitations: the one-piece airbag expands uniformly after inflation, failing to adapt to the differences in head shape among individual patients and making it difficult to specifically fit the protruding and concave areas of the patient's head, resulting in insufficient head fixation precision. This imperfect fixation method is prone to causing image blurring due to even slight head movements, severely affecting the accuracy of diagnostic results.

[0005] Therefore, we propose a magnetic resonance imaging (MRI) positioning device suitable for the head. Summary of the Invention

[0006] In view of the above situation and to overcome the shortcomings of the prior art, the present invention provides a magnetic resonance imaging positioning device suitable for the head.

[0007] The technical solution adopted by this invention is as follows: This invention provides a magnetic resonance imaging positioning device for the head, comprising a reclining board and a head cover. The head cover is fixedly connected to one side of the reclining board. Pneumatic clamping assemblies are distributed on both sides inside the head cover. Each pneumatic clamping assembly includes a fixing block, a piston cylinder, an air distribution cylinder, and an airbag mounting plate. The fixing block is fixedly disposed inside the head cover. The piston cylinder is fixedly disposed on the fixing block. A piston block is disposed inside the piston cylinder. A piston rod is fixedly connected to the piston block. The piston rod slides out of one end of the piston cylinder and is fixedly connected to a moving plate. The air distribution cylinder is fixedly disposed on the moving plate. A slidably sealed ventilation rod passes through one end of the air distribution cylinder. The venting rod is connected to a three-way pipe at one end outside the air distribution cylinder. A head-fixing airbag is fixed on one side of the airbag mounting plate. The head-fixing airbag is connected to one end of the three-way pipe through an inflation tube. The other end of the piston cylinder is connected to an air inlet pipe one. A one-way valve is connected in series on the air inlet pipe one. The other end of the air distribution cylinder is connected to an air inlet pipe two. The air inlet pipe one is connected to the air inlet pipe two through a first flexible hose. An air inlet pipe three is connected to the end of the piston cylinder near the air inlet pipe one. The three-way pipe is connected to the air inlet pipe three through a second flexible hose. The air inlet pipe one is connected to the manually inflatable airbag. The inflation airflow first enters the air distribution cylinder and then enters the piston cylinder.

[0008] Furthermore, a sealing block is fixedly installed inside the gas distribution cylinder. A central hole is opened in the middle of the sealing block for the venting rod to slide and seal through. A through hole is opened on the venting rod along its diameter direction. A shaft hole is opened on the venting rod along its axis direction. One end of the shaft hole is connected to the through hole, and the other end of the shaft hole is connected to the T-shaped pipe. The through hole is located on one side of the sealing block. A vent hole is opened on the sealing block along its length direction. The vent hole is located around the central hole.

[0009] Furthermore, a sealing cover is fixedly attached to one side wall of the sealing block. The sealing cover is coaxial with the central hole. Elastic sheets are fixedly distributed on the inner circumference of the sealing cover. One end of the elastic sheet extends obliquely into one end of the central hole. When the venting rod moves to one side of the sealing cover, one end of the venting rod abuts against the elastic sheet. At this time, the sealing block seals the through hole.

[0010] Furthermore, a limiting rod is fixedly provided on one inner wall of the sealing cover, and the elastic sheet is located around the limiting rod. When the venting rod moves into the sealing cover, it abuts against the limiting rod.

[0011] Furthermore, connecting blocks are fixedly provided at the upper and lower ends of the movable plate, and a sliding rod slides through the connecting block. One end of the sliding rod is fixedly connected to the airbag mounting plate, and the other end of the sliding rod is fixedly connected to a limit block.

[0012] Furthermore, air supply pipes are respectively installed along the length of the inner walls on both sides of the headgear. Air distribution pipes are connected to the air supply pipes. After passing through the inner wall of the headgear, the air distribution pipes are connected to the air inlet pipes through flexible hoses. The front end of the air supply pipes is connected to the main air pipe. The main air pipes are connected to the manually inflatable airbags through flexible hoses.

[0013] Furthermore, the fixing block has an installation groove on its side wall near the middle of the headgear, and an arc-shaped groove adapted to the piston cylinder is formed on the inner wall of the installation groove. The piston cylinder is fixedly installed in the arc-shaped groove. A female Velcro fastener is fixedly connected to the other side wall of the fixing block, and male Velcro fasteners are fixedly connected to the inner walls of both sides of the headgear. An air pipe receiving groove is also formed on the side wall of the fixing block connected to the inner wall of the headgear. The air pipe receiving groove is connected to the installation groove, and the air inlet pipe and the air distribution pipe are located in the air pipe receiving groove.

[0014] Furthermore, the bottom of the headgear is higher than the bottom of the reclining board, and a conduit groove is provided on the side wall of the reclining board near the headgear. The air supply pipe and the air pipe connecting the manually inflatable airbag are laid in the conduit groove.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows:

[0016] 1. This invention abandons the traditional one-piece airbag structure and adopts a design with multiple pneumatic clamping components distributed on both sides inside the headgear in conjunction with the head fixation airbag. The airbag mounting plate is moved adaptively by pneumatic drive. Combined with the inflation of the airbag, it can be specifically fitted to the raised and recessed areas of different patients' heads. This solves the defect of traditional one-piece airbags that cannot adapt to various head shapes, greatly improves the fit and stability of head fixation, and avoids the impact of slight head shaking on the quality of MRI imaging.

[0017] 2. During the inflation process of this invention, when the head-fixing airbag comes into contact with the patient's head, the reaction force generated by the head on the head-fixing airbag will push the ventilation rod to move towards the sealing cover. The ventilation rod abuts against the elastic sheet, causing the elastic sheet to deform, until the ventilation rod abuts against the limiting rod to complete the positioning. At this time, the sealing block completely blocks the through hole, and the airflow can no longer enter the head-fixing airbag, causing it to stop inflating and moving, thus achieving precise fixation of the corresponding area of ​​the head. Through this adaptive triggering mechanism, each head-fixing airbag can automatically complete the fixation according to the contact situation with the head, without the need for manual adjustment, ensuring that all airbags can fit tightly against different areas of the head, forming an all-round, dead-angle-free fixation effect, further improving the accuracy and reliability of head fixation, and minimizing head displacement during scanning.

[0018] 3. The headgear of the present invention is designed to fit into the groove of the head coil, eliminating the need to modify or replace the head coil of the existing MRI equipment in the hospital. It can be directly adapted to the existing equipment, which greatly reduces the threshold and cost for hospitals to introduce this positioning device, avoids the additional investment brought about by equipment upgrades, and at the same time ensures compatibility and continuity of use with the existing equipment, making it easier to promote and apply in clinical scenarios.

[0019] 4. The fixing block of this invention is detachably connected to the headgear via Velcro, which facilitates the disassembly and maintenance of the pneumatic clamping components; the diversion design of the air supply pipe, the air distribution pipe and the main air pipe enables the components on both sides to work synchronously, and the main air pipe is easy to connect to the manual inflation airbag, simplifying the operation process; the setting of the air pipe receiving groove and the guide tube groove enables the air pipe to be stored in an orderly manner, avoids damage to the air pipe, and ensures smooth gas transmission. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the present invention after removing the pneumatic clamping component;

[0023] Figure 3 for Figure 2 A three-dimensional structural diagram of the structure shown from another perspective;

[0024] Figure 4 This is a schematic diagram of the present invention in conjunction with the head coil;

[0025] Figure 5 This is a three-dimensional structural diagram of the pneumatic clamping assembly in this invention;

[0026] Figure 6 This is a three-dimensional structural diagram of the pneumatic clamping assembly after the fixing block is removed in this invention;

[0027] Figure 7 This is a three-dimensional structural diagram of the fixing block in this invention;

[0028] Figure 8 This is a cross-sectional view of the fixing block in this invention;

[0029] Figure 9 This is a cross-sectional view of the fixed block and piston cylinder after they are fitted together in this invention;

[0030] Figure 10 This is a three-dimensional structural diagram of the gas distribution cylinder in this invention;

[0031] Figure 11 This is a cross-sectional view of the gas distribution cylinder in this invention;

[0032] Figure 12 for Figure 6 Enlarged view of point A in the image.

[0033] The components include: 1. Reclining board; 2. Headgear; 3. Pneumatic clamping assembly; 31. Fixing block; 311. Mounting groove; 312. Arc groove; 313. Female Velcro strap; 314. Air pipe receiving groove; 32. Piston cylinder; 321. Piston block; 322. Piston rod; 323. Air inlet pipe one; 33. Air distribution cylinder; 331. Sealing block; 3311. Center hole; 3312. Vent hole; 332. Sealing cover; 333. Elastic sheet; 334. Limiting rod; 34. 341. Airbag mounting plate, 342. Head-fixed airbag, 35. Inflation tube, 36. Moving plate, 37. Connecting block, 38. Sliding rod, 39. Limiting block, 30. Ventilation rod, 31. Through hole, 32. Shaft hole, 37. T-connector, 38. Second hose, 39. First hose, 40. Inlet pipe 2, 50. Inlet pipe 3, 61. Manually inflatable airbag, 72. Air delivery tube, 83. Branch air tube, 94. Main air tube, 10. Guide groove, 11. Head coil. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] like Figures 1-12 As shown, the present invention provides a magnetic resonance imaging positioning device for the head, including a reclining board 1 and a head cover 2. The head cover 2 is fixed to one side of the reclining board 1, and pneumatic clamping components 3 are distributed on both sides inside the head cover 2. The patient's head is fixed by the pneumatic clamping components 3 on both sides.

[0037] The pneumatic clamping assembly 3 includes a fixed block 31, a piston cylinder 32, an air distribution cylinder 33, and an airbag mounting plate 34. The fixed block 31 is fixedly installed inside the headgear 2, serving as the mounting base for the pneumatic clamping assembly 3. The piston cylinder 32 is fixedly installed on the fixed block 31. A piston block 321 is provided inside the piston cylinder 32. A piston rod 322 is fixedly connected to the piston block 321. After the piston rod 322 slides out of one end of the piston cylinder 32, a movable plate 35 is fixedly connected to it. The piston rod 322 and the movable plate 35 are moved by the sliding of the piston block 321 inside the piston cylinder 32, thereby realizing the position adjustment of the airbag mounting plate 34.

[0038] The air distribution cylinder 33 is fixedly inserted through the movable plate 35 and located on the upper and lower sides of the movable plate 35. One end of the air distribution cylinder 33 is slidably sealed through the air rod 36. The end of the air rod 36 outside the air distribution cylinder 33 is connected to the three-way pipe 37. A head fixing airbag 341 is fixedly installed on one side of the airbag mounting plate 34. The head fixing airbag 341 is connected to one end of the three-way pipe 37 through the inflation pipe 342. The inflation pipe 342 is a rigid pipe and passes through the airbag mounting plate 34. The air distribution cylinder 33 is used to realize the diversion of the inflation airflow, so that the airflow can both drive the movable plate 35 to move and inflate the head fixing airbag 341.

[0039] The other end of the piston cylinder 32 is connected to an intake pipe 323, which is connected in series with a one-way valve (not shown in the figure). The gas in the intake pipe 323 must enter the gas distributor 33 through the first flexible hose 38, and then be diverted into the piston cylinder 32. It will not flow directly into the piston cylinder 32. The other end of the gas cylinder 33 is connected to the second air inlet pipe 39. The first air inlet pipe 323 is connected to the second air inlet pipe 39 through the first flexible hose 38. The piston cylinder 32 is connected to the third air inlet pipe 4 near the first air inlet pipe 323. The three-way pipe 37 is connected to the third air inlet pipe 4 through the second flexible hose 371. The second flexible hose 371 moves through the moving plate 35. The first air inlet pipe 323 is connected to the manually inflatable airbag 5. The manually inflatable airbag 5 provides inflation power to realize the airflow supply of the entire pneumatic system. The manually inflatable airbag 5 is existing technology and will not be described in detail here. In addition, it should be noted that all components of this device are made of non-magnetic and non-metallic materials to avoid electromagnetic interference to the nuclear magnetic resonance equipment.

[0040] like Figures 1-12As shown, a sealing block 331 is fixedly installed inside the air distribution cylinder 33. A central hole 3311 is opened in the middle of the sealing block 331 for the air rod 36 to slide and seal through, ensuring that the air rod 36 can slide smoothly on the sealing block 331 and has good sealing performance. A through hole 361 is opened on the air rod 36 along its diameter direction, and a shaft hole 362 is opened on the air rod 36 along its axis direction. One end of the shaft hole 362 is connected to the through hole 361, and the other end of the shaft hole 362 is connected to the three-way pipe 37. The through hole 361 is located on one side of the sealing block 331. A vent hole 3312 is opened on the sealing block 331 along its length direction. The vent hole 3312 is located around the central hole 3311. When the through hole 361 is connected to the vent hole 3312, the airflow can enter the shaft hole 362 through the vent hole 3312 and the through hole 361, and then flow to the head-fixed airbag 341 and piston cylinder 32 through the three-way pipe 37.

[0041] like Figures 1-12 As shown, a sealing cover 332 is fixedly attached to one side wall of the sealing block 331. The sealing cover 332 is coaxial with the central hole 3311. Elastic plates 333 are fixedly distributed on the inner circumference of the sealing cover 332. One end of the elastic plate 333 extends obliquely into one end of the central hole 3311. When the venting rod 36 moves towards the sealing cover 332, one end of the venting rod 36 abuts against the elastic plate 333. At this time, the sealing block 331 blocks the through hole 361, and the elastic plate 333 has a certain elasticity. The device is made of plastic. When the vent rod 36 moves toward the sealing cover 332, the elastic sheet 333 is deformed by the pressure of the vent rod 36, which in turn positions the vent rod 36. When the elastic sheet 333 is not deformed, the through hole 361 is located outside the sealing block 331. When the elastic sheet 333 is deformed by pressure, the through hole 361 begins to enter the central hole 3311, ensuring that the sealing block 331 can reliably seal the through hole 361 and achieve the blocking of airflow.

[0042] like Figures 1-12 As shown, a limiting rod 334 is also fixed on the inner wall of one side of the sealing cover 332. The elastic sheet 333 is located around the limiting rod 334. When the venting rod 36 moves into the sealing cover 332, it abuts against the limiting rod 334. The limiting rod 334 is used to limit the maximum movement distance of the venting rod 36 to avoid excessive movement of the venting rod 36 and damage to the elastic sheet 333. When the venting rod 36 abuts against the limiting rod 334, the sealing block 331 blocks the through hole 361.

[0043] like Figures 1-12As shown, connecting blocks 351 are fixedly provided at the upper and lower ends of the movable plate 35. A sliding rod 352 slides through the connecting block 351. One end of the sliding rod 352 is fixedly connected to the airbag mounting plate 34, and the other end of the sliding rod 352 is fixedly connected to a limit block 353. The cooperation between the sliding rod 352 and the connecting block 351 can guide the movement of the airbag mounting plate 34, ensuring that the airbag mounting plate 34 always moves in the horizontal direction and avoids tilting. The limit block 353 can prevent the sliding rod 352 from falling off the connecting block 351, ensuring the stability of the structure.

[0044] like Figures 1-12 As shown, air supply pipes 6 are respectively installed along the length of the inner walls on both sides of the headgear 2. Air distribution pipes 61 are connected to the air supply pipes 6. After passing through the inner wall of the headgear 2, the air distribution pipes 61 are connected to the air inlet pipe 323 through a hose. The front end of the air supply pipes 6 is connected to the main air pipe 7. The main air pipe 7 is connected to the manually inflatable airbag 5 through a hose. The air supply pipes 6 and the air distribution pipes 61 can realize the diversion of airflow and ensure that the pneumatic clamping components 3 on both sides can work synchronously.

[0045] like Figures 1-12 As shown, a mounting groove 311 is provided on the side wall of the fixing block 31 near the middle of the headgear 2. An arc-shaped groove 312 adapted to the piston cylinder 32 is provided on the inner wall of the mounting groove 311. The piston cylinder 32 is fixedly installed in the arc-shaped groove 312. The first hose 38, the second hose 371 and the air inlet pipe 34 are all movably located in the mounting groove 311. A female Velcro fastener 313 is fixedly connected to the other side wall of the fixing block 31. Female Velcro fasteners are fixedly connected to the inner walls of both sides of the headgear 2. The fixing block 31 and the inner wall of the headgear 2 are detachably connected through the cooperation of the Velcro fasteners, which facilitates disassembly, assembly and maintenance. An air pipe receiving groove 314 is also provided on the side wall of the fixing block 31 connected to the inner wall of the headgear 2. The air pipe receiving groove 314 is connected to the mounting groove 311. The air inlet pipe 323 and the air distribution pipe 61 are located in the air pipe receiving groove 314. The air pipe receiving groove 314 can store the air pipe, avoid the air pipe being exposed and damaged, and make the structure more compact.

[0046] like Figures 1-12 As shown, the bottom of the headgear 2 is higher than the bottom of the reclining board 1. The headgear 2 fits into the groove on the head coil 9. The end of the reclining board 1 near the headgear 2 is in contact with the head coil 9, ensuring that the bottom of the head coil 9 is flush with the bottom of the reclining board 1. The bottom and back sides of the headgear 2 are equipped with cushioning pads to protect the patient's head. A duct groove 8 is provided on the side wall of the reclining board 1 near the headgear 2. The air tube 6, which connects to the manually inflatable air bag 5, is laid in the duct groove 8. The duct groove 8 can protect and store the air tube, preventing it from being crushed by the patient or damaged by other objects, and ensuring smooth gas transmission.

[0047] In practical use, the device is placed on the scanning table, with the headgear 2 fitting into the groove on the head coil 9. The patient lies on the reclining board 1, places their head inside the headgear 2, and then inflates the manual inflation bag 5 by manually pressing it. The airflow enters the air supply pipes 6 on both sides through the main air pipe 7, then enters the first air inlet pipe 323 through the branch air pipe 61, then enters the second air inlet pipe 39 through the first flexible hose 38, and finally enters the branch air cylinder 33. At this time, the ventilation rod 36 is not resisted by the head, and the through hole 361 is connected to the vent hole 3312 on the sealing block 331. At this time, the airflow enters the head-fixing airbag 341 through the three-way pipe 371, and at the same time, it enters the piston cylinder 32 through the second flexible hose 371 and the third air inlet pipe 4, pushing the piston block 321 to move towards the middle of the headgear 2. The piston block 321 drives the piston rod 322, the moving plate 35, the branch air cylinder 33, and the airbag mounting plate 34 to move towards the head simultaneously. When the head on the airbag mounting plate 34... After the head-fixing airbag 341 contacts the patient's head, continue pressing the manually inflatable airbag 5. The head generates a reaction force on the head-fixing airbag 341, pushing the ventilation rod 36 to move towards the sealing cover 332. During the movement of the ventilation rod 36, one end of it abuts against the elastic plate 333, and the elastic plate 333 deforms until the ventilation rod 36 abuts against the limiting rod 334 to position the ventilation rod 36. At this time, the sealing block 331 completely blocks the through hole 361, so that the airflow in the air distribution cylinder 33 cannot flow out through the vent hole 3312 and the through hole 361. At this time, the airflow cannot enter the three-way tube 37 through the shaft hole 362 on the ventilation rod 36. At this time, the head-fixing airbag 341 stops inflating and stops moving, completing the fixation of a certain area of ​​the patient by the head-fixing airbag 341. Continue pressing the manually inflatable airbag 5 until the manually inflatable airbag 5 cannot be pressed. This indicates that all the head-fixing airbags 341 have been attached and fixed to the patient's head.

[0048] After inflation and fixation are completed, stop pressing the manual inflation airbag 5, and then the MRI scan can be performed. After the scan is completed, release the fixation by following these steps: open the deflation valve on the manual inflation airbag 5, and the piston block 321 will no longer be subjected to air pressure. At this time, the gas in the piston cylinder 32 will be discharged through the one-way valve on the air inlet pipe 323. At this time, the air pressure relief is completed. At the same time, the rebound force of the elastic plate 333 drives the ventilation rod 36 to move, so that the sealing block 331 no longer blocks the through hole 361. At the same time, the gas in the head fixation airbag 341 is also discharged and deflated, releasing the fixation on the patient's head.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetic resonance imaging positioning device for the head, characterized in that: The device includes a reclining board (1) and a headgear (2) fixed to one side of the reclining board (1). Pneumatic clamping assemblies (3) are provided on both sides inside the headgear (2). The pneumatic clamping assembly (3) includes a fixing block (31), a piston cylinder (32), an air distribution cylinder (33), and an airbag mounting plate (34). The fixing block (31) is fixed inside the headgear (2), and the piston cylinder (32) is fixed to the fixing block (31). A piston block (321) is provided inside the piston cylinder (32), and a piston rod (34) is fixed to the piston block (321). 22) A movable plate (35) is fixedly connected to one end of the sliding extended piston cylinder (32); the air distribution cylinder (33) is fixedly inserted through the movable plate (35), and one end of it is slidably sealed through the air passage rod (36). The end of the air passage rod (36) located outside the air distribution cylinder (33) is connected to a three-way pipe (37); a head fixing airbag (341) is fixedly provided on one side of the airbag mounting plate (34), and the head fixing airbag (341) is connected to one end of the three-way pipe (37) through the inflation pipe (342); The piston cylinder (32) is connected to an air inlet pipe 1 (323) with a one-way valve at the other end, and an air inlet pipe 2 (39) is connected to the other end of the air distribution cylinder (33). The air inlet pipe 1 (323) is connected to the air inlet pipe 2 (39) through the first hose (38). The piston cylinder (32) is connected to an air inlet pipe 3 (4) at the end near the air inlet pipe 1 (323). The three-way pipe (37) is connected to the air inlet pipe 3 (4) through the second hose (371). The air inlet pipe 1 (323) is connected to the manually inflatable airbag (5). The gas distribution cylinder (33) is fixedly provided with a sealing block (331). The sealing block (331) has a central hole (3311) in the middle for the air passage rod (36) to slide and seal through. The air passage rod (36) has a through hole (361) along its diameter direction and a shaft hole (362) along its axis direction. One end of the shaft hole (362) is connected to the through hole (361), and the other end of the shaft hole (362) is connected to the three-way pipe (37). The through hole (361) is located on one side of the sealing block (331). The sealing block (331) has a vent hole (3312) along its length direction. The vent hole (3312) is located around the central hole (3311). A sealing cover (332) is fixedly attached to one side wall of the sealing block (331). The sealing cover (332) is coaxial with the central hole (3311). Elastic sheets (333) are fixedly distributed on the inner circumference of the sealing cover (332). One end of the elastic sheet (333) extends obliquely into one end of the central hole (3311). When the venting rod (36) moves toward the sealing cover (332), it abuts against the elastic sheet (333).

2. The magnetic resonance imaging positioning device for the head according to claim 1, characterized in that: A limiting rod (334) is fixedly provided on one side of the inner wall of the sealing cover (332). The elastic sheet (333) is located around the limiting rod (334). When the ventilation rod (36) moves into the sealing cover (332), it abuts against the limiting rod (334).

3. The magnetic resonance imaging positioning device for the head according to claim 2, characterized in that: The upper and lower ends of the movable plate (35) are fixedly provided with connecting blocks (351), and a sliding rod (352) slides through the connecting block (351). One end of the sliding rod (352) is fixedly connected to the airbag mounting plate (34), and the other end of the sliding rod (352) is fixedly connected to a limit block (353).

4. A magnetic resonance imaging positioning device for the head according to claim 3, characterized in that: An air supply pipe (6) is provided along the length of the inner wall on both sides of the headgear (2). An air distribution pipe (61) is connected to the air supply pipe (6). The air distribution pipe (61) passes through the inner wall of the headgear (2) and is connected to the air inlet pipe (323) through a hose. A main air pipe (7) is provided on the front side wall of the headgear (2). The front end of the air supply pipe (6) is connected to the main air pipe (7). The main air pipe (7) is connected to the manually inflatable airbag (5) through a hose.

5. A magnetic resonance imaging positioning device for the head according to claim 4, characterized in that: The fixing block (31) has an installation groove (311) on the side wall near the middle of the headgear (2). The inner wall of the installation groove (311) has an arc groove (312) that is adapted to the piston cylinder (32). The piston cylinder (32) is fixedly installed in the arc groove (312). A female Velcro fastener (313) is fixedly connected to the other side wall of the fixing block (31). A female Velcro fastener is fixedly connected to the inner walls of both sides of the headgear (2). An air tube receiving groove (314) is opened on the side wall of the fixing block (31) that is connected to the inner wall of the headgear (2). The air tube receiving groove (314) is connected to the installation groove (311). The air inlet pipe (323) and the air distribution pipe (61) are located in the air tube receiving groove (314).

6. A magnetic resonance imaging positioning device for the head according to claim 5, characterized in that: The bottom of the headgear (2) is higher than the bottom of the lying board (1). A conduit groove (8) is provided on the side wall of the lying board (1) near the headgear (2). The air supply pipe (6) and the air pipe connected to the manually inflatable airbag (5) are laid in the conduit groove (8).

Images