Limb fixing device for intensive care medicine

Abstract

The invention discloses a limb fixing device for intensive care medicine in the technical field of medical auxiliary equipment.The limb fixing device comprises a bed body, a control assembly is arranged on one side of the top of the bed body, the control assembly comprises a camera used for capturing eyeball movement of a patient and a display screen, and the camera is fixedly installed on one side of the display screen; the display screen is used for displaying a tightening instruction and a relaxing instruction, and a pointer capable of moving according to the eyeball track of the patient is displayed on the display screen; an eyeball tracking module and a sight line control module are arranged in the camera, the eyeball tracking module is used for tracking the eyeball track of a patient, the sight line control module is used for moving the pointer according to the sight line of the patient, and the controller is used for controlling the air supply assembly to inflate or deflate the air bag according to a tightening or loosening instruction indicated by the pointer. The eyeball tracking module is arranged in the camera to track the sight track of a patient, the patient is helped to adjust the tightness degree of the binding belt through the display screen and the controller, and the comfort degree when the limbs of the patient are fixed is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical auxiliary equipment, in particular to a limb fixation device for critical care medicine. Background Art

[0002] Critical care medicine is a primary clinical discipline that studies the occurrence, progression, diagnosis, and treatment of life-threatening pathophysiological conditions. It primarily serves critically ill patients, including those from related disciplines such as internal medicine, surgery, and obstetrics. Despite its relatively recent development, critical care medicine has rapidly evolved, becoming a key hallmark of modern medicine and a reflection of the quality of both the discipline and the hospital. In critical care medicine, physicians conduct quantitative patient monitoring, provide continuous critical care monitoring throughout the entire treatment course, and offer comprehensive treatment.

[0003] Patients in critical care units often have indwelling "lifelines" such as endotracheal tubes, gastric tubes, central venous lines, and various drainage tubes and urinary catheters. These tubes are crucial to the patient's treatment, but they can also cause discomfort. Excessive movement can cause these tubes to become dislodged, causing varying degrees of injury, potentially extending hospital stays, increasing costs, and even leading to death. Therefore, the use of limb immobilization devices can effectively limit the patient's range of motion, reduce the risk of tube dislodgment, and protect the patient's life.

[0004] Currently, most existing limb fixation devices fix the patient's limbs by using restraint components. This fixation method will cause discomfort to the patient. However, due to the patient's serious condition, the patient is unable to express his or her discomfort to medical staff, which affects the patient's user experience. Therefore, it is necessary to propose a limb fixation device for critical care medicine. Summary of the Invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a limb fixation device for critical care medicine. On the basis of fixing the patient's limbs, the built-in eye tracking module of the camera is used to track the patient's line of sight, and the display screen and controller are used to help the patient adjust the tightness of the restraint belt, thereby improving the comfort of the patient's limbs when being fixed.

[0006] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: a limb immobilization device for critical care medicine, comprising a bed, a fixing assembly for immobilizing a patient's limbs provided on the top of the bed, a restraining assembly for restraining the patient's limbs and a massage assembly for massaging the patient's limbs provided within the fixing assembly, a lifting assembly for adjusting the position of the patient's head provided on one side of the top of the bed, a control assembly for controlling the tightness of the restraining assembly according to the patient's eye movement provided on the other side of the top of the bed, and an air supply assembly for supplying air to the restraining assembly provided at the bottom of the bed;

[0007] The restraint assembly includes a first restraint belt and a second restraint belt, both of which are fixedly connected to the interior of the fixing assembly and arranged side by side. The first restraint belt and the second restraint belt are each composed of a plurality of airbags, each of which has a through hole in the middle, and each of which is connected to the air supply assembly. The connection points between the airbags and the air supply assembly are connected to electric valves. A controller is fixedly connected to the bottom of the bed, and the electric valves are connected to the controller signal.

[0008] The control component includes a camera and a display screen for capturing the patient's eye movements. The camera is fixedly mounted on one side of the display screen. A support component for supporting the display screen is provided at the bottom of the display screen. The display screen is used to display tightening and relaxation instructions, and the display screen displays a pointer that can be moved according to the patient's eye trajectory.

[0009] The camera has a built-in eye tracking module and a sight control module. The eye tracking module is used to track the patient's eye trajectory, and the sight control module is used to move the pointer according to the patient's sight. The controller is used to control the air supply component to inflate or deflate the airbag according to the tightening or relaxation instructions indicated by the pointer.

[0010] The principle of the basic solution is: the controller controls the air supply assembly and the electric valve to inflate and deflate the different airbags in the first and second restraints, the airbags are used to fix the patient's limbs, the camera is used to capture the patient's eye movements, the eye tracking module is used to determine the tightening or relaxation function that the patient needs to achieve, and the controller is used to achieve the tightening or relaxation function required by the patient.

[0011] The beneficial effects of the basic solution are: 1. The controller controls the air supply assembly to inflate and deflate the different airbags in the first and second restraint belts respectively, so that the first restraint belt can be relaxed and the second restraint belt can be tightened.

[0012] 2. Since the patient's limbs are elastic, some space needs to be reserved for the massage component to move when massaging the limbs. Loosening the first strap and tightening the second strap can help improve the massage effect of the massage component while fixing the patient's limbs.

[0013] 3. Continuously tracking the patient's eyeballs through the camera is conducive to accurately identifying the patient's eye trajectory and then controlling the inflation and collection of the air supply component through the controller, thereby controlling the contraction and expansion of the airbag.

[0014] Furthermore, the display screen also displays massage instructions. The massage component includes a telescopic rod, which is provided with a driving part. One end of the telescopic rod is fixedly connected to a massage ball, and the other end of the telescopic rod is fixedly connected to the fixed component. The telescopic rod is located inside the through hole.

[0015] The beneficial effect of the basic solution is: the telescopic rod is driven to extend and retract by the driving member, and the extension and retraction of the telescopic rod is conducive to driving the massage ball to move back and forth, thereby massaging the patient's limbs and reducing the discomfort caused by the patient's limbs being fixed for a long time.

[0016] Furthermore, the fixing assembly includes a fixing shell, one end of the fixing shell is hinged to the top of the bed, the other end of the fixing shell is in contact with the top of the bed, a lock is fixedly connected to one side of the fixing shell hinged to the top of the bed, the first restraint belt and the second restraint belt are both fixedly connected to the inner wall of the fixing shell, and one end of the telescopic rod is fixedly connected to the inner wall of the fixing shell.

[0017] The beneficial effect of the basic solution is that the fixation shell can adjust the fixation range according to the thickness of the limbs of different patients through the lock buckle, which is conducive to adapting to more patients of different body shapes.

[0018] Furthermore, the air supply component includes an air pump, which is fixedly connected to the bottom of the bed. The air outlet and air inlet of the air pump are both connected to the air bag, and the air pump is connected to the controller signal.

[0019] The beneficial effect of the basic solution is that the controller controls the air pump to inflate and deflate different air bags, which helps the air pump adjust the tightness of the first restraint belt and the second restraint belt.

[0020] Furthermore, a heating wire is fixedly connected inside the airbag, and the heating wire is electrically connected to the controller.

[0021] The beneficial effect of the basic solution is: the heating wire is activated by the controller, which is conducive to applying heat to the patient's limbs during the fixation of the patient's limbs, thereby promoting the patient's blood circulation and alleviating the discomfort caused by the fixation of the patient's limbs.

[0022] Furthermore, the lifting assembly includes an electric-controlled wire cylinder, which is fixedly connected to the bottom of the bed, and a headrest is fixedly connected to the top of the electric-controlled wire cylinder. The headrest is hinged to the bed, and the electric-controlled wire cylinder is connected to the controller signal.

[0023] The beneficial effect of the basic solution is: the controller controls the extension and retraction of the electric control wire cylinder and then controls the lifting and lowering of the headrest, which is beneficial for medical staff to adjust the height of the headrest according to the different conditions of the patient and further improve the patient's comfort.

[0024] Furthermore, guardrails are fixedly connected to both sides of the bed along the length direction.

[0025] The beneficial effect of the basic solution is that the guardrail can provide certain protection for patients and reduce the occurrence of patients falling off the bed due to unconscious movement.

[0026] Furthermore, the support assembly includes a support rod, one end of the support rod is fixedly connected to the display screen, and the other end of the support rod is fixedly connected to a side of the bed away from the headrest.

[0027] The beneficial effect of the basic solution is that the display screen is firmly supported by the support rod, thereby ensuring the stability of the patient when using the device.

[0028] Furthermore, the display screen also displays a calling instruction, and a pager is fixedly connected to the display screen, and the pager is connected to the controller signal.

[0029] The beneficial effect of the basic solution is that the pager helps patients to call medical staff in time when they feel unwell and there is no one to take care of them.

[0030] Furthermore, earmuffs are fixedly connected to both sides of the headrest.

[0031] The beneficial effects of the basic solution are: the earmuffs can cover the patient's ears, provide a quiet environment for the patient, reduce the impact of environmental noise on the patient, help improve the patient's comfort and promote the patient's recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a system of a limb fixation device for critical care medicine according to an embodiment of the present invention.

[0033] Figure 2 An axonometric view of a limb fixation device for critical care medicine according to an embodiment of the present invention.

[0034] Figure 3 A cross-sectional view of a limb fixation device for critical care medicine according to an embodiment of the present invention.

[0035] Figure 4 A transverse cross-sectional view of a restraint assembly of a limb fixation device for critical care medicine according to an embodiment of the present invention.

[0036] Figure 5 A longitudinal cross-sectional view of a fixation assembly of a limb fixation device for critical care medicine according to an embodiment of the present invention.

[0037] The figure marks in the drawings of the specification include: 1. bed body; 2. headrest; 3. fixed shell; 4. display screen; 5. support rod; 6. second restraint belt; 7. telescopic rod; 8. massage ball; 9. camera; 10. air pump; 11. electric control wire cylinder; 12. airbag; 13. through hole; 14. first restraint belt. DETAILED DESCRIPTION

[0038] The following is further described in detail through specific implementation methods:

[0039] Example 1:

[0040] Basically as attached Figure 1-Figure 5 As shown: A limb fixation device for critical care medicine includes a bed 1, a fixing component for fixing the patient's limbs is provided on the top of the bed 1, and a restraining component for restraining the patient's limbs and a massage component for massaging the patient's limbs are provided inside the fixing component. A lifting component for adjusting the position of the patient's head is provided on one side of the top of the bed 1, and the lifting component includes an electric-controlled wire cylinder 11, which is fixedly connected to the bottom of the bed 1 by bolts, and a headrest 2 is fixedly connected to the top of the electric-controlled wire cylinder 11 by bolts. The headrest 2 is hinged to the bed 1, and the electric-controlled wire cylinder 11 is connected to the controller signal.

[0041] A control component for controlling the tightness of the restraint component according to the patient's eye movement is provided on the other side of the top of the bed 1, and an air supply component for supplying air to the restraint component is provided at the bottom of the bed 1;

[0042] The restraint assembly includes a first restraint belt 14 and a second restraint belt 6. The first restraint belt 14 and the second restraint belt 6 are both fixedly connected to the interior of the fixed assembly by bolts. The first restraint belt 14 and the second restraint belt 6 are arranged side by side. The first restraint belt 14 and the second restraint belt 6 are both composed of a plurality of airbags 12. The interior of the airbags 12 is bonded with an electric heating wire by adhesive, and the electric heating wire is electrically connected to the controller. A through hole 13 is provided in the middle of each airbag 12. Each airbag 12 is connected to the air supply assembly. An electric valve is provided at the connection point between the airbag 12 and the air supply assembly. The bottom of the bed body 1 is fixedly connected to the controller by bolts. The electric valve is connected to the controller signal. The display screen 4 also displays massage instructions. The massage assembly includes a telescopic rod 7. Each telescopic rod 7 is provided with a drive member. One end of the telescopic rod 7 is fixedly connected to a massage ball 8 by bolts. The other end of the telescopic rod 7 is fixedly connected to the fixed assembly by bolts. The telescopic rod 7 is located inside the through hole 13.

[0043] The fixing assembly includes a fixing shell 3, one end of the fixing shell 3 is hinged to the top of the bed 1, and the other end of the fixing shell 3 is in contact with the top of the bed 1. The hinged side of the fixing shell 3 and the top of the bed 1 is fixedly connected with a lock by bolts, and the first restraint belt 14 and the second restraint belt 6 are both fixedly connected to the inner wall of the fixing shell 3 by bolts, and one end of the telescopic rod 7 is fixedly connected to the inner wall of the fixing shell 3 by bolts.

[0044] The air supply assembly includes an air pump 10, which is fixedly connected to the bottom of the bed 1 by bolts. The air outlet and air inlet of the air pump 10 are both connected to the air bag 12, and the air pump 10 is connected to the controller signal.

[0045] The control assembly includes a camera 9 for capturing the patient's eye movements and a display screen 4. The camera 9 is bolted to one side of the display screen 4. A support assembly is provided at the bottom of the display screen 4 for supporting the display screen 4. The support assembly includes a support rod 5, one end of which is bolted to the display screen 4, and the other end of the support rod 5 is bolted to the side of the bed 1 away from the headrest 2. The display screen 4 is used to display tightening and loosening instructions, and displays a pointer that can be moved according to the patient's eye trajectory. The display screen 4 also displays call instructions. A pager is bolted to the display screen 4 and is connected to the controller signal.

[0046] The camera 9 has a built-in eye tracking module and a sight line control module. The eye tracking module is used to track the patient's eye trajectory, and the sight line control module is used to move the pointer according to the patient's sight. The controller is used to control the air supply component to inflate or deflate the airbag 12 according to the tightening or relaxation instructions indicated by the pointer. When the patient's eye trajectory control pointer moves to the tightening instruction or the relaxation instruction and does not move for more than 10 seconds, it is determined that the air supply component needs to be controlled to inflate or deflate the airbag 12.

[0047] Guardrails are fixedly connected to the bed body 1 on both sides along the length direction by bolts.

[0048] The specific implementation process is as follows: first, the medical staff needs to transfer the critically ill patient to the bed 1, then the medical staff can open the fixed shell 3 through the lock, and then place the patient's limbs in the fixed shell 3, and finally fasten the fixed shell 3 to close the lock.

[0049] After the buckle is fastened, the air pump 10 can be turned on to inflate the airbags 12 in the first restraint belt 14 and the second restraint belt 6 , so that the patient's limbs are firmly fixed through the airbags 12 .

[0050] The camera 9 will monitor the patient's eyes in real time. The eye tracking module built into the camera 9 will continuously track the patient's line of sight. When the patient's line of sight moves to the display screen 4, the line of sight control module will control the pointer to move according to the patient's line of sight. When the patient's line of sight stays in the relaxation instruction area on the display screen 4 for more than 10 seconds, that is, when the pointer stays in the relaxation instruction area on the display screen 4 for more than 10 seconds, the controller will receive this instruction and then control the air pump 10 to deflate the airbag 12, so that the airbag 12 reduces the degree of fixation of the patient's limbs. When the pointer stays in the tightening instruction area on the display screen 4 for more than 10 seconds, the controller will receive this instruction and then control the air pump 10 to inflate the airbag 12, so that the airbag 12 increases the degree of fixation of the patient's limbs. When the pointer stays in the call instruction area on the display screen 4 for more than 10 seconds, the controller will receive this instruction and then control the pager to call the medical staff.

[0051] The patient's lying position can also be photographed by the camera 9, and the controller will analyze the photographed image. When the controller determines that the patient has not deflated or inflated the airbag 12 by controlling the pointer movement through sight within 30 minutes, the controller will automatically control the air pump 10 to deflate the airbag 12 and relax the fixation of the patient's limbs. After deflation for 5 minutes, the controller controls the air pump 10 to inflate the airbag 12 and re-fix the patient's limbs. By regularly changing the fixation state of the patient's limbs, the pressure on the patient's local skin tissue is reduced, which helps to improve local blood circulation. The deflation and inflation of the airbag 12 not only ensures the stability of the patient's limb fixation, but also reduces the damage to the patient's skin tissue caused by long-term fixation. It can also relieve the patient's discomfort caused by long-term fixation and improve the patient's comfort.

[0052] When a patient feels stiff and uncomfortable due to being unable to move their limbs for a long time, they can use the built-in eye tracking module and sight control module of the camera 9 to control the pointer to move to the massage instruction area. When the pointer stays in the massage instruction area on the display screen 4 for more than 10 seconds, the controller will receive this instruction and then control the air pump 10 and the electric valve to slightly relax the airbag 12 on the first strap 14, while the airbag 12 on the second strap 6 remains unchanged. The controller then controls the drive member of the telescopic rod 7 on the first strap 14 to drive the telescopic rod 7 to reciprocate. Because the first airbag 12 is slightly loose and tight, a certain distance can be reserved between the massage ball 8 and the skin. When the massage ball 8 is used close to the skin, the direct and strong pressure can cause the user to feel discomfort or even pain. Reserving a certain distance can reduce direct pressure on the skin and make the massage process more comfortable. After the massage ball 8 in the first strap 14 has finished massaging the patient, the controller can control the air pump 10 to inflate the airbag 12 in the first strap 14, tightening the first strap 14. The controller can then control the air pump 10 to deflate the airbag 12 in the second strap 6, slightly relaxing the second airbag 12 so that the second strap 6 can continue massaging the patient. Taking turns massaging the patient with the massage balls 8 in the first and second straps 14, 6, can enhance the massage effect of the massage balls 8, promote blood circulation in the patient's limbs, and alleviate stiffness and discomfort caused by prolonged immobilization.

[0053] If the controller detects that the patient has not deflated or inflated the airbag 12 by visually controlling the pointer movement for 30 minutes, it will also control the driver to reciprocate the telescopic rod 7, using the massage balls 8 to massage the patient's limbs, thereby helping to prevent pressure sores. Prolonged immobilization of limbs can cause muscle stiffness and discomfort. Massage with the massage balls 8 can relax muscles, effectively alleviating these symptoms and improving patient comfort.

[0054] While the massage is being performed, the controller activates the heating wire to heat the patient's body. This heat compress can soothe tense muscles, reduce fatigue, and relieve stiffness. By dilating blood vessels and promoting blood circulation, the heat compress relaxes the patient's limbs, helping to alleviate tension and stiffness caused by maintaining the same posture for extended periods.

[0055] Example 2:

[0056] The difference from the above embodiment is that earmuffs are fixedly connected to both sides of the headrest 2.

[0057] The specific implementation process is as follows: Due to the large number of patients in the ward, the room is relatively cluttered and prone to various noises, such as the groans of other patients, the conversations of medical staff, and the hum of equipment. These noises can disrupt patients' sleep and reduce their sleep quality. Using earmuffs can effectively block out these noises, creating a relatively quiet environment for patients, helping them to fall asleep better and maintain a deep sleep state.

[0058] Noise not only affects sleep quality but can also increase stress levels. Prolonged exposure to noise can cause patients to feel tense and uneasy, which can hinder their recovery process. Using earmuffs can reduce noise interference, help patients relax, and reduce stress levels, thereby promoting recovery. Resting in a quiet environment allows patients to focus more on their recovery process and minimize the discomfort caused by external distractions.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0060] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A limb fixation device for critical care medicine, comprising a bed (1), characterized in that: The top of the bed (1) is provided with a fixing assembly for fixing the patient's limbs, the fixing assembly is provided with a restraining assembly for restraining the patient's limbs and a massage assembly for massaging the patient's limbs, one side of the top of the bed (1) is provided with a lifting assembly for adjusting the position of the patient's head, the other side of the top of the bed (1) is provided with a control assembly for controlling the tightness of the restraining assembly according to the patient's eye movement, and the bottom of the bed (1) is provided with an air supply assembly for supplying air to the restraining assembly; The restraint assembly comprises a first restraint belt (14) and a second restraint belt (6), the first restraint belt (14) and the second restraint belt (6) are both fixedly connected inside the fixing assembly, the first restraint belt (14) and the second restraint belt (6) are arranged side by side, the first restraint belt (14) and the second restraint belt (6) are both composed of a plurality of air bags (12), the middle of each air bag (12) is provided with a through hole (13), the air bags (12) are both connected to the air supply assembly, the connection points between the air bags (12) and the air supply assembly are both connected to electric valves, the bottom of the bed body (1) is fixedly connected to a controller, and the electric valves are both connected to the controller signal; The control component comprises a camera (9) for capturing the patient's eye movement and a display screen (4), wherein the camera (9) is fixedly mounted on one side of the display screen (4), a support component for supporting the display screen (4) is provided at the bottom of the display screen (4), the display screen (4) is used to display tightening instructions and loosening instructions, and the display screen (4) displays a pointer that can be moved according to the patient's eye trajectory; The camera (9) has an eye tracking module and a sight control module built in. The eye tracking module is used to track the patient's eye trajectory, the sight control module is used to move a pointer according to the patient's sight, and the controller is used to control the air supply component to inflate or deflate the airbag (12) according to the tightening or loosening instructions indicated by the pointer.

2. The limb fixation device for critical care medicine according to claim 1, characterized in that: The display screen (4) also displays massage instructions. The massage assembly includes a telescopic rod (7). The telescopic rod (7) is provided with a driving member. One end of the telescopic rod (7) is fixedly connected to a massage ball (8). The other end of the telescopic rod (7) is fixedly connected to the fixed assembly. The telescopic rod (7) is located inside the through hole (13).

3. The limb fixation device for critical care medicine according to claim 2, characterized in that: The fixing assembly comprises a fixing shell (3), one end of the fixing shell (3) is hinged to the top of the bed body (1), the other end of the fixing shell (3) contacts the top of the bed body (1), a lock buckle is fixedly connected to one side of the fixing shell (3) hinged to the top of the bed body (1), a first restraining belt (14) and a second restraining belt (6) are both fixedly connected to the inner wall of the fixing shell (3), and one end of the telescopic rod (7) is fixedly connected to the inner wall of the fixing shell (3).

4. The limb fixation device for critical care medicine according to claim 3, characterized in that: The air supply assembly includes an air pump (10), which is fixedly connected to the bottom of the bed (1), the air outlet and the air inlet of the air pump (10) are both connected to the air bag (12), and the air pump (10) is connected to the controller signal.

5. The limb fixation device for critical care medicine according to claim 4, characterized in that: A heating wire is fixedly connected inside the air bag (12), and the heating wire is electrically connected to the controller.

6. The limb fixation device for critical care medicine according to claim 5, characterized in that: The lifting assembly comprises an electric-controlled wire cylinder (11), which is fixedly connected to the bottom of the bed (1), a headrest (2) is fixedly connected to the top of the electric-controlled wire cylinder (11), the headrest (2) is hinged to the bed (1), and the electric-controlled wire cylinder (11) is connected to the controller signal.

7. The limb fixation device for critical care medicine according to claim 6, characterized in that: Both sides of the bed body (1) along the length direction are fixedly connected with guardrails.

8. The limb fixation device for critical care medicine according to claim 7, characterized in that: The support assembly comprises a support rod (5), one end of the support rod (5) is fixedly connected to the display screen (4), and the other end of the support rod (5) is fixedly connected to a side of the bed body (1) away from the headrest (2).

9. The limb fixation device for critical care medicine according to claim 8, characterized in that: The display screen (4) also displays a calling instruction. A pager is fixedly connected to the display screen (4), and the pager is connected to the controller signal.

10. The limb fixation device for critical care medicine according to claim 9, characterized in that: Earmuffs are fixedly connected to both sides of the headrest (2).

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