Intelligent adjustable head fixing mechanism for ophthalmologic operation

Through the intelligent adjustable ophthalmic surgery head fixing mechanism, the combination of electric telescopic rod and arc rod, combined with extrusion block and airbag, the problems of unstable and insufficient comfort of head fixing in the prior art are solved, and the problem of instability and insufficient comfort of head fixing in the prior art is realized. The stable fixation and comfortable support of the heads of different patients improve the safety and experience of ophthalmic surgery.

CN119074259AInactive Publication Date: 2024-12-06XIAN FIRST HOSPITAL
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Patent Information

Application Number
CN202411205719.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-30
Publication Date
2024-12-06
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing head fixation mechanism for ophthalmic surgery lacks adaptability and flexibility in dealing with different head forms of patients, resulting in unstable head during the operation, increasing the risk of accidental injury, and unable to provide comfortable support and fit, affecting the operation. Overall experience and effect.

Method used

An intelligent adjustable ophthalmic surgery head fixing mechanism is designed, using electric telescopic rod and arc rod combined with extrusion block for head clamping and fixing, and secondary fixing is performed through positioning belt and square port, matching airbags and head support. Provides comfortable support, adjusts the squeeze pressure using a pressure sensor to ensure head stability and comfort.

Benefits of technology

It achieves stable fixation of head widths of different patients, reduces the risk of head movement during surgery, improves the safety and overall experience of the surgery, and ensures the patient's comfort and surgical effect.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of medical instruments, in particular to an intelligent adjustable ophthalmologic operation head fixing mechanism which comprises a bottom plate and two fixing blocks fixedly mounted at the top of the bottom plate, supporting rods are fixedly mounted at the tops of the two fixing blocks, and a head support is rotatably mounted at the top of the bottom plate; and an air bag is fixedly mounted at the top of the bottom plate. According to the head fixing mechanism adopted in the ophthalmologic operation, an electric telescopic rod is controlled to extend to drive an arc-shaped rod and an extrusion block to extrude and clamp the two sides of the head of a patient, so that the head of the patient is stably fixed, and the face of the patient is secondarily fixed through a positioning belt; the nose of the patient is correspondingly sleeved with the square opening, so that the patient can keep breathing, the head of the patient is stably fixed, the head fixing device can cope with different widths of the heads of the patients, the stability of the heads of the patients in the eye operation process is guaranteed, movement in the eye operation process is avoided, and the safety of the operation is improved.
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Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to an intelligent adjustable head fixing mechanism for ophthalmic surgery. Background Art

[0002] In the precise operation of ophthalmic surgery, although advanced anesthesia technology greatly reduces the risk of patients moving due to pain or discomfort and ensures the smooth progress of the operation, any slight fluctuations in the operating room cannot be ignored. As an extremely fragile and functionally critical part of the human body, the eye's surgical process requires extremely high stability and precision. Even in a deep anesthesia state, the patient's slight movement caused by external stimuli, unconscious reactions or physiological reflexes may instantly break the balance of the surgical area, leading to serious consequences such as accidental contact of surgical instruments, corneal scratches, and lens damage, which in turn affects the patient's vision recovery and even the quality of daily life. Therefore, the ophthalmic surgery team needs to have a high degree of professionalism and adaptability to ensure that the surgical environment is absolutely quiet and the surgical operation is extremely delicate. At the same time, the patient's condition is closely monitored to minimize any potential risks and ensure the safety and success of the operation.

[0003] Currently, when doctors perform eye surgery on patients, they usually ask assistants to manually fix the patient's head to facilitate the doctors to perform precision surgery. Compared with body surgery, eye surgery is more difficult and requires more stringent precision of surgical instruments. Assistants need to manually keep the patient's head fixed for a long time. After keeping the hands fixed for a long time, fatigue will occur and the hands are prone to shaking, which has a certain impact on the surgery. Therefore, the emergence of head fixation mechanism has solved this problem well.

[0004] The head fixation mechanism used in existing ophthalmic surgeries shows weak adaptability and flexibility when dealing with different patient head shapes. This limitation is particularly evident during the operation. If the patient's head moves accidentally, it is very easy to come into contact with precision surgical instruments, thereby increasing the risk of accidental injury. In addition, if the fixation device cannot provide comfortable support and fit, it will also cause unnecessary physical and psychological discomfort to the patient, affecting the overall experience and effect of the operation. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent adjustable ophthalmic surgery head fixing mechanism, which has the characteristics of improving adaptability and comfort during surgery.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent adjustable ophthalmic surgery head fixing mechanism, comprising a bottom plate, two fixing blocks fixedly mounted on the top of the bottom plate, support rods fixedly mounted on the tops of the two fixing blocks, a head rest rotatably mounted on the top of the bottom plate, an air bag fixedly mounted on the top of the bottom plate, an electric telescopic rod fixedly mounted on one side of the support rod, an arc rod mounted on the output end of the electric telescopic rod, and extrusion blocks fixedly mounted on both ends of the arc rod;

[0007] A positioning belt is arranged above the head support, a square opening is opened on the surface of the positioning belt, a controller is fixedly installed on the top of the bottom plate, and a protective cover is slidably installed on the top of the controller.

[0008] In order to facilitate the support of the head, as a preferred intelligent adjustable ophthalmic surgery head fixing mechanism of the present invention, a fixing seat is fixedly installed on the top of the base plate, a threaded column is connected to the inner thread of the fixing seat, and the top of the threaded column is fixedly installed with the bottom of the head support.

[0009] In order to improve the comfort, as a preferred intelligent adjustable ophthalmic surgery head fixing mechanism of the present invention, a plurality of handles are fixedly installed on the bottom of the head support, and a connecting head is fixedly installed on the left side of the airbag.

[0010] To facilitate secondary fixation, as a preferred intelligent adjustable ophthalmic surgical head fixation mechanism of the present invention, the right end of the positioning belt is fixedly connected to the arc rod close to the right side of the head support, and the left end of the positioning belt is squeezed into contact with the arc rod close to the left side of the head support.

[0011] For clamping and fixing, as a preferred intelligent adjustable ophthalmic surgical head fixing mechanism of the present invention, a clamping rod is movably installed on one side of the arc rod, and a positioning rod is hinged on one side of the clamping rod, and the positioning rod passes through the arc rod and is movably sleeved.

[0012] For positioning and clamping, as a preferred embodiment of the intelligent adjustable ophthalmic surgery head fixing mechanism of the present invention, a locking cap is provided on a side of the arc rod away from the clamping rod, and the locking cap is threadedly sleeved with the positioning rod.

[0013] For support assistance, as a preferred intelligent adjustable ophthalmic surgical head fixing mechanism of the present invention, movable blocks are rotatably installed on the left and right ends of the support rod, and a movable rod is slidably sleeved on the inner side of the movable block, and the two movable rods are symmetrically arranged with an electric telescopic rod.

[0014] For flexible clamping, as a preferred embodiment of the intelligent adjustable ophthalmic surgery head fixing mechanism of the present invention, one end of the movable rod is hinged to the arc rod, and one end of the electric telescopic rod is hinged to the arc rod.

[0015] For comfortable support, as a preferred embodiment of the intelligent adjustable ophthalmic surgery head fixing mechanism of the present invention, a distance is left between the airbag and the head support, the airbag is located in front of the head support, and the head support is a concave arc structure.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, the head fixing mechanism used in ophthalmic surgery controls the extension of the electric telescopic rod to drive the arc rod and the extrusion block to squeeze and clamp the two sides of the patient's head, so that the patient's head is fixed and stable. The patient's face is secondarily fixed by using a positioning belt, and the patient's nose is correspondingly connected with the square mouth so that the patient can keep breathing, thereby fixing the patient's head and stabilizing it. It can cope with different head widths of patients. The patient's head is kept stable during the eye surgery to avoid movement during the eye surgery, thereby increasing the safety of the surgery.

[0018] 2. In the present invention, the head needs to be fixed before the eye surgery. The corresponding head support and the threaded column are driven to rotate around the fixing seat at the bottom by pushing the handle, and the height of the head support is adjusted so that the patient's head is placed at a comfortable height on the top of the head support. The head support supports the patient's head, and the airbag provides close contact support for the patient's neck, thereby providing comfortable support and fit for the patient's head, bringing physical and psychological comfort to the patient, and improving the overall experience and effect of the surgery.

[0019] 3. In the present invention, the arc rod is extended to drive the movement of the electric telescopic rod, so that the positioning belt fixedly connected to the arc rod moves together, and the head of the patient placed on the top of the head support is positioned and fixed by the arc rod and the extrusion block. The patient's head can be fixed and positioned twice by using the positioning belt. A pressure sensor is provided on one side of the extrusion block, and a pressure threshold is pre-set for the pressure sensor. The extrusion block can appropriately squeeze and clamp the patient's head after contacting the patient's head. When the pressure threshold of the pressure sensor is reached, a signal is transmitted to the corresponding electric telescopic rod to stop the extension movement, thereby achieving squeezing and fixing of the patient's head, ensuring the comfort of clamping and fixing the patient's head, and avoiding damage to the head caused by excessive pressure.

[0020] 4. In the present invention, the movable rod is hinged with the arc rod, and one end of the electric telescopic rod is hinged with the arc rod, so that the movement directions of their hinges are consistent. When the electric telescopic rod is extended to push the arc rod to move, the movable rod can be driven by the arc rod to move along the movable block, so that the movable rod supports the arc rod in the vertical direction, ensuring that the arc rod can drive the extrusion block to horizontally position and fix the patient's head, ensuring that the patient's head is fixed and stable, avoiding accidental movement of the patient's head, reducing the risk of accidental injury, and improving the safety of the patient during eye surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a right top three-dimensional structural diagram of the present invention;

[0022] Figure 2 It is a left top three-dimensional structural diagram of the present invention;

[0023] Figure 3 It is a three-dimensional structural diagram of the present invention from a top view;

[0024] Figure 4 For the present invention Figure 3 The structure diagram at A is enlarged;

[0025] Figure 5 It is a partial three-dimensional structural diagram of the present invention;

[0026] Figure 6 It is a structural diagram of the head support of the present invention.

[0027] In the figure: 1. bottom plate; 2. head support; 3. air bag; 4. fixing block; 5. support rod; 6. positioning belt; 7. square mouth; 8. controller; 9. protective cover; 10. clamping rod; 11. arc rod; 12. positioning rod; 13. connector; 14. electric telescopic rod; 15. locking cap; 16. extrusion block; 17. movable block; 18. movable rod; 19. fixing seat; 20. threaded column; 21. handle. DETAILED DESCRIPTION

[0028] See also Figures 1 to 6 , an intelligent adjustable ophthalmic surgery head fixing mechanism, comprising a base plate 1, two fixing blocks 4 fixedly mounted on the top of the base plate 1, support rods 5 fixedly mounted on the top of the two fixing blocks 4, a head support 2 rotatably mounted on the top of the base plate 1, an air bag 3 fixedly mounted on the top of the base plate 1, an electric telescopic rod 14 fixedly mounted on one side of the support rod 5, an arc rod 11 mounted on the output end of the electric telescopic rod 14, and extrusion blocks 16 fixedly mounted on both ends of the arc rod 11;

[0029] A positioning belt 6 is arranged above the headrest 2 , and a square opening 7 is opened on the surface of the positioning belt 6 . A controller 8 is fixedly installed on the top of the bottom plate 1 , and a protective cover 9 is slidably installed on the top of the controller 8 .

[0030] In this embodiment: a head support 2 is rotatably installed on the top of the base plate 1, and an air bag 3 is fixedly installed on the top of the base plate 1. The interior of the head support 2 is a ring structure filled with sponge, which is convenient for supporting the patient's head through the head support 2, and cooperating with the air bag 3 to support the patient's neck in close contact, thereby providing comfortable support and fit for the patient's head, bringing physical and psychological comfort to the patient, an electric telescopic rod 14 is fixedly installed on one side of the support rod 5, and an arc rod 11 is installed on the output end of the electric telescopic rod 14, and an extrusion block 16 is fixedly installed on both ends of the arc rod 11, and a pressure sensor is arranged on one side of the extrusion block 16, and a pressure threshold is pre-set for the pressure sensor, so that the extrusion block 16 can appropriately squeeze and clamp the head after contacting the patient's head, and a signal will be transmitted when the pressure threshold of the pressure sensor is reached. The corresponding electric telescopic rod 14 stops the extension movement, so as to achieve the compression and fixation of the patient's head. A positioning belt 6 is arranged above the head support 2, and a square opening 7 is opened on the surface of the positioning belt 6. The patient's face is fixed for the second time by using the positioning belt 6, and the square opening 7 is correspondingly fitted to the position of the patient's nose, so that the patient can keep breathing, thereby fixing the patient's head stably and being able to cope with different head widths of patients. The patient's head is kept stable during the eye surgery to avoid movement during the eye surgery, thereby increasing the safety of the surgery. A controller 8 is fixedly installed on the top of the base plate 1, and a protective cover 9 is slidably installed on the top of the controller 8, so that the controller 8 after use can be covered by the protective cover 9 to avoid accidentally touching the button, thereby playing a protective role.

[0031] As a technical optimization solution of the present invention, a fixing seat 19 is fixedly installed on the top of the base plate 1 , a threaded column 20 is threadedly sleeved on the inner side of the fixing seat 19 , and the top of the threaded column 20 is fixedly installed on the bottom of the headrest 2 .

[0032] In this embodiment: the inner side thread of the fixing seat 19 is connected with a threaded column 20, the top of the threaded column 20 is fixedly installed with the bottom of the head support 2, and the fixing seat 19 is fixedly installed on the top of the base plate 1, so that the height of the head support 2 can be adjusted by rotating the head support 2 and the threaded column 20 around the bottom fixing seat 19, so that the patient's head can be placed at a comfortable height on the top of the head support 2.

[0033] As a technical optimization solution of the present invention, a plurality of handles 21 are fixedly installed on the bottom of the head support 2 , and a connector 13 is fixedly installed on the left side of the airbag 3 .

[0034] In this embodiment: multiple handles 21 are arranged in a circular array below the head support 2. By setting the handles 21, the handles 21 can be pushed to drive the corresponding head support 2 and the threaded column 20 to rotate around the bottom fixing seat 19, which is convenient for adjusting the height of the head support 2. By setting the connecting head 13, it is convenient to connect an external air pump for inflation.

[0035] As a technical optimization solution of the present invention, the left end of the positioning belt 6 is fixedly connected to the arc rod 11 close to the left side of the head support 2, and the right end of the positioning belt 6 is squeezed and contacted with the arc rod 11 close to the right side of the head support 2.

[0036] In the present embodiment: the arc rod 11 is driven to move by extending the electric telescopic rod 14, so that the positioning belt 6 fixedly connected to the arc rod 11 moves together, and the head of the patient placed on the top of the head support 2 is positioned and fixed by the arc rod 11 and the extrusion block 16. By providing the positioning belt 6 and the square opening 7, it is convenient for the doctor to perform secondary fixation of the patient's face by using the positioning belt 6, and the square opening 7 is correspondingly connected to the position of the patient's nose, so that the patient can keep breathing, thereby fixing the patient's head stably, and being able to cope with different head widths of patients. The patient's head is kept stable during eye surgery to avoid movement during eye surgery, thereby increasing the safety of the surgery.

[0037] As a technical optimization solution of the present invention, a clamping rod 10 is movably installed on one side of the arc rod 11, and a positioning rod 12 is hinged on one side of the clamping rod 10. The positioning rod 12 passes through the arc rod 11 and is movably sleeved; a locking cap 15 is provided on the side of the arc rod 11 away from the clamping rod 10, and the locking cap 15 is threadedly sleeved with the positioning rod 12.

[0038] In this embodiment: the positioning rod 12 passes through the arc rod 11 and is movably sleeved, and a locking cap 15 is provided on the side of the arc rod 11 away from the clamping rod 10, and the locking cap 15 is threadedly sleeved with the positioning rod 12. The positioning rod 12 passes through the arc rod 11 to facilitate the threaded connection between the locking cap 15 and the positioning rod 12. The positioning rod 12 is driven to move by rotating the locking cap 15, so that the positioning rod 12 pulls the clamping rod 10 to squeeze the positioning belt 6. The positioning belt 6 passes between the clamping rod 10 and the arc rod 11. The locking cap 15 is driven to tighten the arc rod 11 by rotating the locking cap 15, and the positioning belt 6 is fixedly clamped on one side of the arc rod 11 by the clamping rod 10, so that the positioning belt 6 is firmly fixed.

[0039] As a technical optimization solution of the present invention, movable blocks 17 are rotatably installed at the left and right ends of the support rod 5, and a movable rod 18 is slidably sleeved on the inner side of the movable block 17. The two movable rods 18 are symmetrically arranged with the electric telescopic rod 14; one end of the movable rod 18 is hinged to the arc rod 11, and one end of the electric telescopic rod 14 is hinged to the arc rod 11.

[0040] In this embodiment: movable blocks 17 are rotatably installed on the left and right ends of the support rod 5, and a movable rod 18 is slidably sleeved on the inner side of the movable block 17. The movable rod 18 and the movable block 17 are slidably sleeved and installed, and the movable block 17 and the support rod 5 are rotatably installed. When the electric telescopic rod 14 pushes the arc rod 11 and the extrusion block 16 to contact, clamp, and position the patient's head, the arc rod 11 can use one end of the electric telescopic rod 14 as a fulcrum to make the extrusion block 16 contact with the head. The arc rod 11 is supported and auxiliary limited by the movable rod 18, thereby increasing the stability of the arc rod 11 and the extrusion block 16 in positioning and fixing the patient's head, so as to cope with the head shapes of different patients.

[0041] As a technical optimization solution of the present invention, a distance is left between the airbag 3 and the head support 2, the airbag 3 is located in front of the head support 2, and the head support 2 is a concave arc structure.

[0042] In this embodiment: by setting the headrest 2 and the airbag 3 without contact, the patient's head can be placed on the top of the headrest 2, and the patient's neck can also be placed on the top of the airbag 3, thereby improving the patient's comfort experience during surgery.

[0043] Working principle: When in use, first place the device below the patient's head, then place the patient's head on the top of the head support 2, push the handle 21 to drive the corresponding head support 2 and the threaded column 20 to rotate around the bottom fixing seat 19, so as to adjust the height of the head support 2 to meet the lifting height of the patient's head, and then connect and install it with the external air pump through the connecting head 13, inflate the airbag 3, and support the patient's neck through the close contact of the airbag 3, so as to provide comfortable support and fit for the patient's head, and bring physical and psychological comfort to the patient, and then control the button corresponding to the electric telescopic rod 14 in the controller 8 to control the extension movement of the electric telescopic rod 14, and the electric telescopic rod 14 pushes the arc rod 11 and the extrusion block 16 to the patient's head. Contact clamping positioning and fixing, a pressure sensor is arranged on one side of the squeezing block 16, and a pressure threshold is pre-set for the pressure sensor, so that the squeezing block 16 can appropriately squeeze and clamp the patient's head after contacting the patient's head. When the pressure threshold of the pressure sensor is reached, a signal will be transmitted to the corresponding electric telescopic rod 14 to stop the extension movement, thereby realizing the squeezing and fixing of the patient's head, and then the patient's face is fixed for the second time by the positioning belt 6, and the square mouth 7 is correspondingly connected to the position of the patient's nose, so that the patient can keep breathing, thereby fixing the patient's head stably, and being able to cope with different head widths of patients. The patient's head is kept stable during eye surgery to avoid movement during eye surgery, thereby increasing the safety of the surgery and facilitating the doctor to perform surgery on the patient's eyes.

[0044] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature rivets and welding in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. All electrical equipment in the present invention is powered by an external power supply.

[0045] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent adjustable ophthalmic surgery head fixing mechanism, comprising a base plate (1), two fixing blocks (4) fixedly mounted on the top of the base plate (1), and support rods (5) fixedly mounted on the tops of the two fixing blocks (4), characterized in that: A headrest (2) is rotatably mounted on the top of the base plate (1), an airbag (3) is fixedly mounted on the top of the base plate (1), an electric telescopic rod (14) is fixedly mounted on one side of the support rod (5), an arc rod (11) is mounted on the output end of the electric telescopic rod (14), and extrusion blocks (16) are fixedly mounted on both ends of the arc rod (11); A positioning belt (6) is arranged above the headrest (2), and a square opening (7) is provided on the surface of the positioning belt (6). A controller (8) is fixedly installed on the top of the base plate (1), and a protective cover (9) is slidably installed on the top of the controller (8).

2. The intelligent adjustable ophthalmic surgery head fixing mechanism according to claim 1, characterized in that: A fixing seat (19) is fixedly mounted on the top of the base plate (1), a threaded column (20) is threadedly sleeved on the inner side of the fixing seat (19), and the top of the threaded column (20) is fixedly mounted on the bottom of the head support (2).

3. The intelligent adjustable ophthalmic surgery head fixing mechanism according to claim 1, characterized in that: A plurality of handles (21) are fixedly mounted on the bottom of the head support (2), and a connector (13) is fixedly mounted on the left side of the air bag (3).

4. The intelligent adjustable ophthalmic surgery head fixing mechanism according to claim 1, characterized in that: The right end of the positioning belt (6) is fixedly connected to the arc-shaped rod (11) close to the right side of the head support (2), and the left end of the positioning belt (6) is in extrusion contact with the arc-shaped rod (11) close to the left side of the head support (2).

5. The intelligent adjustable ophthalmic surgery head fixing mechanism according to claim 1, characterized in that: A clamping rod (10) is movably mounted on one side of the arc-shaped rod (11), a positioning rod (12) is hinged on one side of the clamping rod (10), and the positioning rod (12) penetrates the arc-shaped rod (11) and is movably sleeved.

6. The intelligent adjustable ophthalmic surgery head fixing mechanism according to claim 5, characterized in that: A locking cap (15) is provided on the side of the arc-shaped rod (11) away from the clamping rod (10), and the locking cap (15) is threadedly sleeved with the positioning rod (12).

7. The intelligent adjustable ophthalmic surgery head fixing mechanism according to claim 1, characterized in that: The left and right ends of the support rod (5) are rotatably mounted with movable blocks (17), the inner side of the movable block (17) is slidably sleeved with a movable rod (18), and the two movable rods (18) are symmetrically arranged with the electric telescopic rod (14).

8. The intelligent adjustable head fixing mechanism for ophthalmic surgery according to claim 7, characterized in that: One end of the movable rod (18) is hinged to the arc-shaped rod (11), and one end of the electric telescopic rod (14) is hinged to the arc-shaped rod (11).

9. The intelligent adjustable ophthalmic surgery head fixing mechanism according to claim 1, characterized in that: A distance is left between the airbag (3) and the headrest (2); the airbag (3) is located in front of the headrest (2); and the headrest (2) is a concave arc-shaped structure.