Adjustable head fixing device for otolaryngological surgery

Abstract

The invention relates to the technical field of head fixing devices, and discloses an adjustable head fixing device for otolaryngological surgery, which comprises an operating bed and a headrest block, the headrest block is arranged at the top of the operating bed, and a fixing assembly for fixing the head of a patient is arranged in the headrest block. The top of the fixing assembly is provided with an auxiliary fixing assembly used for assisting the fixing assembly in attaching and fixing the head of the patient, the fixing assembly is internally provided with an anti-reversion assembly used for preventing loosening in the process of fixing the head of the patient, and through the arrangement of the auxiliary fixing assembly, the fixing angle can be automatically adjusted according to the specific shape of the head of the patient; the arc-shaped clamping block is tightly attached to the outline of the head of a patient, the arc-shaped clamping block can fix the head of the patient in a more attached mode through flexible rotation of the fan-shaped block and the fan-shaped rotating block, pressure can be evenly dispersed, the patient feels more comfortable in the operation process, and the safety of the patient in the operation is improved.

Description

Technical Field

[0001] The invention relates to the field of head fixing devices, in particular to an adjustable head fixing device for otolaryngology surgery. Background Art

[0002] The head fixation device for ENT surgery is a medical device specially used to fix the patient's head position during ENT surgery. Its main function is to ensure that the patient's head remains stable during surgery, provide conditions for the surgeon to operate accurately, and reduce the surgical risks caused by head movement.

[0003] Traditional adjustable head fixation devices for ENT surgery on the market usually use belts, simple clamps, or fixed-shape headrests with basic fixing clamps. However, belt fixation is difficult to ensure sufficient tightening force, and it is easy to cause skin injuries due to excessive tightening, and it is impossible to effectively fix the head if it is too loose. If the clamp fixation method is not adjusted properly, it is very easy to cause excessive local pressure concentration and damage the patient's head tissue. Sensitive areas such as ears and temples will experience pain and congestion due to compression. As a result, these simple clamps will cause discomfort or even pain to patients in the ears and temples.

[0004] In terms of adjustment convenience, traditional devices often require collaborative operation by multiple people. For example, devices fixed with bolts and nuts require the use of tools such as wrenches for adjustment, which is cumbersome and time-consuming. In scenarios where surgery is tightly scheduled, this will greatly extend the surgery preparation time, reduce the work efficiency of the operating room, and even delay the best time for surgery. In terms of structural stability, its mechanical structure is relatively simple. In the face of complex situations during surgery, such as collision of surgical instruments and unconscious struggles of patients, its anti-interference ability is weak, and it is easy to suffer structural damage or fixation failure. Traditional head fixation devices have less than ideal fixation effects, which can cause slight displacement of the head and affect surgical accuracy. For example, during delicate ear surgery, a slight shake of the head can cause the surgical instrument to deviate from the target position.

[0005] In terms of fixation stability, traditional devices mostly rely on simple mechanical structures to maintain fixation, such as bolt tightening or relying on friction. This method is prone to gradual loosening due to wear of mechanical parts during long operations. For example, in a complex ENT surgery, as the operation time goes on, the bolts will have a slight displacement due to vibration, resulting in a decrease in their tightening force, which makes the head fixation device's clamping force on the patient's head weaker. Once the patient's head shakes, even a very small amplitude, it will seriously interfere with the surgeon's operation.

[0006] Therefore, it is necessary to provide an adjustable head fixing device for ENT surgery to solve the above problems. Summary of the invention

[0007] In view of the shortcomings of the prior art, the object of the present invention is to provide an adjustable head fixation device for otolaryngology surgery.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an adjustable head fixation device for otolaryngology surgery, comprising an operating bed and a headrest block, wherein the headrest block is arranged on the top of the operating bed, a fixing component for fixing the patient's head is arranged inside the headrest block, an auxiliary fixing component for assisting the fixing component in fitting and fixing the patient's head is arranged on the top of the fixing component, and an anti-reversal component is arranged inside the fixing component to prevent loosening during the process of fixing the patient's head.

[0009] Preferably, the fixing assembly includes a square groove block, the square groove block is fixedly connected to the bottom of the headrest block, and the square groove block is communicated with the headrest block, a positioning plate is fixedly connected to the inside of the square groove block, a driving gear rod is rotatably connected between the positioning plate and the square groove block, and a rotating button is fixedly connected to the outer wall of the driving gear rod.

[0010] Preferably, the fixing assembly also includes a full gear rod, which is rotatably connected to the bottom of the positioning plate, the bottom of the positioning plate is rotatably connected to a half gear rod, the middle part of the positioning plate is symmetrically rotatably connected to a connecting rod, and the full gear rod and the half gear rod are rotatably connected to an arc clamping block at one end away from the positioning plate.

[0011] Preferably, the auxiliary fixing assembly includes fan-shaped blocks, which are evenly distributed and fixedly connected to the inside of the arc-shaped clamping block. The inside of the fan-shaped block is symmetrically rotationally connected to the first fan-shaped rotating block, and the insides of the two first fan-shaped rotating blocks are symmetrically rotationally connected to the second fan-shaped rotating blocks.

[0012] Preferably, the anti-reversal component includes a ratchet ring, which is fixedly connected to the end of the driving gear rod away from the rotating button, the side of the positioning plate away from the rotating button is fixedly connected to a positioning rod, the end of the positioning rod away from the positioning plate is rotatably connected to a limiting tooth, and the side of the positioning plate away from the rotating button is fixedly connected to an electromagnet block.

[0013] Preferably, the rotating button is arranged on the outer side of the square groove block, the full gear rod is meshed with the half gear rod, and the driving gear rod is meshed with the full gear rod.

[0014] Preferably, one end of the two connecting rods away from the positioning plate is rotatably connected to the middle part of the arc-shaped clamping block, and the arc-shaped clamping block is arranged inside the headrest block and the square groove block.

[0015] Preferably, a torsion spring is provided between the positioning rod and the limiting tooth.

[0016] Preferably, the electromagnet block is fixedly connected to the top of the limiting tooth, and the magnetic poles of the electromagnet block and the limiting tooth are the same, and there is an electrical connection between the electromagnet block and the power supply.

[0017] The adjustable head fixing device for ENT surgery provided by the present invention has the following beneficial effects compared with the prior art:

[0018] 1. Through the setting of the auxiliary fixing component, when the two arc-shaped clamping blocks fix the patient's head, the second fan-shaped rotating block will first contact the patient's head, and then the second fan-shaped rotating block will rotate along the inside of the first fan-shaped rotating block according to the shape of the patient's head, and the first fan-shaped rotating block will rotate along the inside of the fan-shaped block together with the second fan-shaped rotating block, so that the second fan-shaped rotating block is automatically adjusted to a suitable fixed angle. This design can automatically adjust the fixed angle according to the specific shape of the patient's head, so that the arc-shaped clamping block fits closely with the contour of the patient's head. Through the flexible rotation of the fan-shaped block and the fan-shaped rotating block, the arc-shaped clamping block can be more closely fixed to the patient's head, effectively reducing the gap generated during fixation, thereby enhancing the fixation effect;

[0019] Among them, the above-mentioned structure reduces the problem of excessive local pressure caused by the mismatch between the fixing device and the head shape. The traditional fixing device cannot fit the head well, resulting in excessive pressure on certain parts, causing discomfort or even injury to the patient. This adaptive structure can evenly disperse the pressure, making the patient feel more comfortable during the operation. At the same time, it also reduces the risks of skin damage, poor blood circulation, etc. caused by local compression, thereby improving the safety of the patient during the operation.

[0020] Secondly, through the coordinated adjustment of the fan-shaped block, the first fan-shaped rotating block, and the second fan-shaped rotating block, the two arc-shaped clamping blocks can fix the head in a more precise manner, providing more stable conditions for surgical operations. When the second fan-shaped rotating block automatically adjusts the angle, the two arc-shaped clamping blocks can better embrace the head, limiting the movement of the patient's head in all directions, effectively reducing the possibility of head shaking during surgery.

[0021] 2. Through the setting of the fixing component, when the staff drives the driving gear rod to rotate by turning the button, the driving gear rod will drive the full gear rod and the half gear rod to rotate, and the setting of the connecting rod makes the full gear rod and the half gear rod drive the two arc-shaped clamping blocks to rotate, so that the arc-shaped clamping blocks are fixed to the patient's head in an embracing manner. Compared with the head fixing devices on the market, doctors or staff only need to easily turn the button to accurately control the opening and closing degree of the arc-shaped clamping blocks. Compared with the traditional fixing devices, there is no need to use complex tools or cumbersome manual adjustments, which saves the time for surgical preparation. In the case of emergency surgery, the patient's head can be quickly fixed, which improves the efficiency of surgery.

[0022] Secondly, the coordination of the full gear rod and the half gear rod and the connection of the connecting rod constitute a stable and reliable transmission system. The various components are tightly engaged, and the power transmission is efficient and stable, reducing the risk of fixation failure due to loosening or failure of the mechanical structure. During long operations, this stable structure can continue to maintain effective fixation of the patient's head.

[0023] 3. By setting the anti-reversal component, when the head fixing device is used, the electromagnet block will always push the limiting teeth to conflict with the ratchet ring through magnetic force after being energized, so that the ratchet ring can only rotate in one direction, thereby avoiding the arc clamping block from loosening when the full gear rod and the half gear rod drive the arc clamping block to fix the patient's head. The magnetic force generated by the electromagnet block after being energized pushes the limiting teeth to conflict with the ratchet ring, thereby realizing the one-way rotation restriction of the ratchet ring. The above provides an extremely reliable locking mechanism for the arc clamping block, which can effectively prevent loosening caused by external interference or mechanical vibration.

[0024] Secondly, the magnetic force of the electromagnet block is used to control the ratchet ring, which is convenient and precise. Compared with the traditional mechanical locking method, electromagnetic control can achieve locking and unlocking functions through simple power-on and power-off operations, which is more convenient and quick to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the position relationship of the overall device of the present invention;

[0026] Figure 2 It is a cross-sectional view of the overall device of the present invention;

[0027] Figure 3 It is a cross-sectional view of the headrest block and the fixing assembly of the present invention;

[0028] Figure 4 For the present invention Figure 3 A magnified view of the structure at center;

[0029] Figure 5 It is a schematic diagram of the position relationship between the arc-shaped clamping block and the auxiliary fixing assembly of the present invention;

[0030] Figure 6 For the present invention Figure 5 A magnified view of the structure at B in the middle;

[0031] Figure 7 It is an exploded view of the sector block, the first sector rotating block, and the second sector rotating block of the present invention;

[0032] Figure 8 It is a schematic diagram of the positional relationship between the fixing component and the anti-reversal component of the present invention;

[0033] Fig. 9 For the present invention Figure 8 Enlarged view of the structure at point C in the middle.

[0034] Reference numerals: 11, operating table; 12, headrest block;

[0035] The fixing assembly includes: 21, square groove block; 22, positioning plate; 23, driving gear rod; 24, rotating button; 25, full gear rod; 26, half gear rod; 27, connecting rod; 28, arc clamping block;

[0036] The auxiliary fixing assembly includes: 31, a fan-shaped block; 32, a first fan-shaped rotating block; 33, a second fan-shaped rotating block;

[0037] The anti-reversal component includes: 41, a ratchet ring; 42, a positioning rod; 43, a limiting tooth; 44, an electromagnet block. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] In the description of the present invention, the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0040] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0041] Implementation example Figures 1 to 9As shown, an adjustable head fixation device for otolaryngology surgery provided by an embodiment of the present invention includes an operating bed 11 and a headrest block 12. The headrest block 12 is arranged on the top of the operating bed 11. A fixing component for fixing the patient's head is arranged inside the headrest block 12. An auxiliary fixing component for assisting the fixing component in fitting and fixing the patient's head is arranged on the top of the fixing component. An anti-reversal component is arranged inside the fixing component to prevent loosening during the process of fixing the patient's head.

[0042] The fixing component includes a square groove block 21, which is fixedly connected to the bottom of the headrest block 12, and the square groove block 21 is communicated with the headrest block 12. A positioning plate 22 is fixedly connected to the inside of the square groove block 21, and a driving gear rod 23 is rotatably connected between the positioning plate 22 and the square groove block 21, and a rotating button 24 is fixedly connected to the outer wall of the driving gear rod 23.

[0043] The fixing assembly also includes a full gear rod 25, which is rotatably connected to the bottom of the positioning plate 22, and a half gear rod 26 is rotatably connected to the bottom of the positioning plate 22. The middle part of the positioning plate 22 is symmetrically rotatably connected to a connecting rod 27, and the ends of the full gear rod 25 and the half gear rod 26 away from the positioning plate 22 are both rotatably connected to an arc clamping block 28.

[0044] The auxiliary fixing assembly includes fan-shaped blocks 31, which are evenly distributed and fixedly connected to the inside of the arc-shaped clamping block 28. The inside of the fan-shaped block 31 is symmetrically connected to the first fan-shaped rotating block 32, and the insides of the two first fan-shaped rotating blocks 32 are symmetrically connected to the second fan-shaped rotating blocks 33.

[0045] The anti-reversal component includes a ratchet ring 41, which is fixedly connected to the end of the driving gear rod 23 away from the rotating button 24, and a positioning rod 42 is fixedly connected to the side of the positioning plate 22 away from the rotating button 24. The end of the positioning rod 42 away from the positioning plate 22 is rotatably connected to a limiting tooth 43, and an electromagnet block 44 is fixedly connected to the side of the positioning plate 22 away from the rotating button 24.

[0046] The rotating button 24 is arranged on the outer side of the square groove block 21, which is convenient for rotating the rotating button 24. The full gear rod 25 is meshed with the half gear rod 26, so that the full gear rod 25 can drive the half gear rod 26 to rotate, and the driving gear rod 23 is meshed with the full gear rod 25, so that the driving gear rod 23 can drive the full gear rod 25 to rotate.

[0047] The ends of the two connecting rods 27 away from the positioning plate 22 are rotatably connected to the middle part of the arc-shaped clamping block 28, so that the connecting rods 27 have a limiting effect on the arc-shaped clamping block 28, and the arc-shaped clamping block 28 is arranged inside the headrest block 12 and the square groove block 21, so that the arc-shaped clamping block 28 can rotate along the inside of the headrest block 12 and the square groove block 21.

[0048] A torsion spring is provided between the positioning rod 42 and the limiting tooth 43 so that the limiting tooth 43 cannot conflict with the ratchet ring 41 when the electromagnet block 44 is not energized.

[0049] The electromagnet block 44 is fixedly connected to the top of the limiting tooth 43, so that when the electromagnet block 44 is energized, it can push the limiting tooth 43 to compress the torsion spring through magnetic force, and the magnetic poles of the electromagnet block 44 and the limiting tooth 43 are the same, so that the electromagnet block 44 can push the limiting tooth 43 after being energized. There is an electrical connection between the electromagnet block 44 and the power supply, and the electromagnet block 44 is energized synchronously when the equipment is powered on.

[0050] Working principle: In the initial state, the full gear rod 25 and the half gear rod 26 are parallel to the two connecting rods 27, the two arc-shaped clamping blocks 28 do not conflict with each other, and the limiting teeth 43 conflict with the ratchet ring 41.

[0051] When the patient's head needs to be fixed, the patient first needs to lie on the operating table 11, and then place the patient's head at the center of the headrest block 12, and then the staff turns on the power of the device and turns the rotation button 24 at the same time;

[0052] When the staff rotates the rotation button 24, the rotation button 24 is arranged outside the square groove block 21, so that the rotation button 24 can be rotated easily;

[0053] The rotation of the rotation button 24 will drive the driving gear rod 23 to rotate. Since the driving gear rod 23 is meshed with the full gear rod 25, the rotation button 24 will drive the full gear rod 25 to rotate through the driving gear rod 23, and the full gear rod 25 is meshed with the half gear rod 26. Then, the full gear rod 25 and the half gear rod 26 rotate synchronously, and the two arc-shaped clamping blocks 28 will be moved in an arc shape during the rotation of the full gear rod 25 and the half gear rod 26.

[0054] The ends of the two connecting rods 27 away from the positioning plate 22 are rotatably connected to the middle part of the arc-shaped clamping block 28, so that during the arc-shaped movement of the two arc-shaped clamping blocks 28, the middle part of the arc-shaped clamping block 28 always rotates around the ends of the connecting rods 27 away from the positioning plate 22, so that the two arc-shaped clamping blocks 28 are fixed to the patient's head in an embracing manner. Compared with the head fixing devices on the market, the doctor or staff only needs to easily turn the button 24 to accurately control the opening and closing degree of the arc-shaped clamping block 28. Compared with the traditional fixing device, there is no need to use complex tools or perform cumbersome manual adjustments, which saves the time for surgical preparation. In the case of emergency surgery, the patient's head can be quickly fixed, thereby improving the efficiency of the operation.

[0055] When the two arc-shaped clamping blocks 28 are embracing and fixing the patient's head, the two arc-shaped clamping blocks 28 will drive the internal fan-shaped block 31, the first fan-shaped rotating block 32, and the second fan-shaped rotating block 33 to move toward the patient's head, and the second fan-shaped rotating block 33 is located on the inner side of the arc-shaped clamping block 28, so that the second fan-shaped rotating block 33 will first contact the patient's head;

[0056] When the second sector-shaped rotating block 33 contacts the patient's head, the second sector-shaped rotating block 33 will then rotate along the inside of the first sector-shaped rotating block 32 according to the shape of the patient's head, and the first sector-shaped rotating block 32 will rotate together with the second sector-shaped rotating block 33 along the inside of the sector-shaped block 31, so that the second sector-shaped rotating block 33 is automatically adjusted to a fixed angle suitable for the patient's head. This design can automatically adjust the fixed angle according to the specific shape of the patient's head, so that the two arc-shaped clamping blocks 28 fit closely with the contour of the patient's head, and the outer wall of the second sector-shaped rotating block 33 can contact the head, effectively avoiding gaps during fixation, thereby enhancing the fixation effect;

[0057] At the same time, it solves the problem of excessive local pressure caused by the mismatch between the fixation device and the patient's head shape. It can evenly disperse the pressure, making the patient feel more comfortable during the operation, improving the patient's safety during the operation, and effectively reducing the possibility of head shaking during the operation.

[0058] Finally, when the staff turns on the power supply of the device, the electromagnet block 44 is electrically connected to the power supply, and when the device is powered on, the electromagnet block 44 is powered on synchronously, and the magnetic poles of the electromagnet block 44 and the limiting tooth 43 are the same, and the electromagnet block 44 is fixedly connected to the top of the limiting tooth 43, and the electromagnet block 44 after powering on will push the limiting tooth 43 to move by magnetic force;

[0059] Because a torsion spring is provided between the positioning rod 42 and the limiting tooth 43, the limiting tooth 43 pushed by the magnetic force will be gradually compressed, and at the same time, the limiting tooth 43 gradually contacts the ratchet ring 41, so that the ratchet ring 41 can only rotate in one direction, and then the arc-shaped clamping block 28 becomes loose when fixing the patient's head, thereby providing a very reliable locking mechanism for the arc-shaped clamping block 28, which can effectively prevent loosening caused by external interference or mechanical vibration.

[0060] Finally, when the staff completes the operation on the patient, in contrast to the above movement process, the electromagnet block 44 stops magnetically repelling the limiting tooth 43 after power is turned off. At this time, the torsion spring between the positioning rod 42 and the limiting tooth 43 will elastically stretch, causing the limiting tooth 43 to move away from the ratchet ring 41, so that the limiting tooth 43 releases the restriction on the one-way rotation of the ratchet ring 41. Compared with the traditional mechanical locking method, the electromagnetic control can realize the locking and unlocking functions through simple power-on and power-off operations, and the operation is more convenient and quick.

[0061] The staff can then reversely rotate the rotation button 24 to move the arc-shaped clamping block 28 in the reverse direction, so that the arc-shaped clamping block 28 stops fixing the patient's head.

[0062] For those skilled in the art, although several embodiments and examples of the present invention are described, these embodiments and examples are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These embodiments and their variations are included in the scope and subject matter of the invention, and are included in the invention described in the claims and the scope of their equivalents.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An adjustable head fixation device for otolaryngology surgery, comprising an operating table (11) and a headrest block (12), wherein the headrest block (12) is arranged on the top of the operating table (11), characterized in that: The headrest block (12) is provided with a fixing component for fixing the patient's head inside, the top of the fixing component is provided with an auxiliary fixing component for assisting the fixing component in fitting and fixing the patient's head, and the fixing component is provided with an anti-reversal component inside to prevent loosening during the process of fixing the patient's head.

2. The adjustable head fixation device for ENT surgery according to claim 1, characterized in that: The fixing assembly comprises a square groove block (21), the square groove block (21) is fixedly connected to the bottom of the headrest block (12), and the square groove block (21) is communicated with the headrest block (12), a positioning plate (22) is fixedly connected inside the square groove block (21), a driving gear rod (23) is rotatably connected between the positioning plate (22) and the square groove block (21), and a rotating button (24) is fixedly connected to the outer wall of the driving gear rod (23).

3. The adjustable head fixation device for ENT surgery according to claim 2, characterized in that: The fixing assembly also includes a full gear rod (25), the full gear rod (25) is rotatably connected to the bottom of the positioning plate (22), the bottom of the positioning plate (22) is rotatably connected to a half gear rod (26), the middle of the positioning plate (22) is symmetrically rotatably connected to a connecting rod (27), and the ends of the full gear rod (25) and the half gear rod (26) away from the positioning plate (22) are both rotatably connected to an arc-shaped clamping block (28).

4. The adjustable head fixation device for ENT surgery according to claim 3, characterized in that: The auxiliary fixing assembly comprises a fan-shaped block (31), wherein the fan-shaped blocks (31) are evenly distributed and fixedly connected to the inside of the arc-shaped clamping block (28), the inside of the fan-shaped block (31) is symmetrically rotationally connected to a first fan-shaped rotating block (32), and the insides of the two first fan-shaped rotating blocks (32) are both symmetrically rotationally connected to a second fan-shaped rotating block (33).

5. The adjustable head fixation device for ENT surgery according to claim 2, characterized in that: The anti-reversal component comprises a ratchet ring (41), the ratchet ring (41) is fixedly connected to one end of the driving gear rod (23) away from the rotating button (24), the side of the positioning plate (22) away from the rotating button (24) is fixedly connected to the positioning rod (42), the end of the positioning rod (42) away from the positioning plate (22) is rotatably connected to a limiting tooth (43), and the side of the positioning plate (22) away from the rotating button (24) is fixedly connected to an electromagnet block (44).

6. The adjustable head fixation device for ENT surgery according to claim 3, characterized in that: The rotating button (24) is arranged on the outside of the square groove block (21), the full gear rod (25) is meshed with the half gear rod (26), and the driving gear rod (23) is meshed with the full gear rod (25).

7. The adjustable head fixation device for ENT surgery according to claim 3, characterized in that: One end of the two connecting rods (27) away from the positioning plate (22) is rotatably connected to the middle part of the arc-shaped clamping block (28), and the arc-shaped clamping block (28) is arranged inside the headrest block (12) and the square groove block (21).

8. The adjustable head fixation device for ENT surgery according to claim 5, characterized in that: A torsion spring is arranged between the positioning rod (42) and the limiting tooth (43).

9. The adjustable head fixation device for ENT surgery according to claim 5, characterized in that: The electromagnet block (44) is fixedly connected to the upper part of the limiting tooth (43), and the magnetic poles of the electromagnet block (44) and the limiting tooth (43) are the same. The electromagnet block (44) is electrically connected to a power source.

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