Operating chair for ophthalmology department

Abstract

The invention relates to the technical field of operating chairs, in particular to an ophthalmological operating chair which comprises a seat plate, a backrest is arranged at the rear end of the seat plate, and a headrest is arranged on the backrest; a seat base is arranged below the seat plate body, a fixing ring is arranged on the upper portion of the seat base body, an arm supporting mechanism is installed on the fixing ring in a sliding mode, an upper supporting plate in the arm supporting mechanism is used for abutting against an arm and supporting and lifting the arm, and balls are installed on the lower surface of an upper supporting plate body and used for fine adjustment of the direction of the upper supporting plate body. The arm supporting mechanism in the operating chair provides a stable supporting platform for arms of an attending doctor in a long-time operation, so that trembling of the arms of the attending doctor is reduced, and the accuracy of surgical operation and the success rate of the operation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of surgical chairs, and in particular to a surgical chair for ophthalmology. Background Art

[0002] During ophthalmic surgery, a surgical chair is required for treatment. The existing ophthalmic surgical chair is mainly composed of a head fixation device, a seat and a backrest. The seat and the backrest provide the patient with a lying or semi-lying state. The head fixation device is used to fix the patient's head to prevent the patient's head posture from rotating. The existing surgical chairs are developed and designed from the patient's perspective, all to increase the patient's comfort and comfort.

[0003] When eye diseases require surgical treatment, such as glaucoma, corneal transplantation, retinal repair and eye trauma surgery, the surgery takes 2-3 hours or longer. The attending physician's arms are always in a suspended state. The long surgery causes fatigue, unstable arms, tremors, etc., which affect the effect of the surgery. When the attending physician is tired, the current method is to suspend the surgery, rest for a while and then perform the surgery again. However, the operation process races against time, and wasting time may endanger the patient's life safety.

[0004] In order to relieve the problems of arm instability and trembling caused by fatigue of the attending physician during surgery, the existing arm auxiliary support device fixes the arm bracket to the operating table or the arm auxiliary support trolley, and the arm auxiliary trolley is moved to the side of the operating chair. The support plate on the arm auxiliary support device lifts the arm or elbow of the attending physician to relieve the problems of arm instability and trembling caused by fatigue of the attending physician. However, the existing arm auxiliary support device is fixed on the operating chair, and the adjustment angle is relatively limited. The arm support has insufficient freedom of movement of the arm to the front, back, left and right, and cannot perform multi-angle fine adjustment, which limits the range of arm movement of the attending physician during surgery, thereby reducing the flexibility and accuracy of the surgery.

[0005] Therefore, the present application provides a surgical chair for ophthalmology to solve the problems raised in the above background technology. Summary of the invention

[0006] The purpose of the present invention is to provide an ophthalmic surgical chair to solve the problem that the arms of the attending surgeon are suspended in the air for a long time during ophthalmic surgery, causing fatigue, unstable arms, tremors, etc.; to solve the problem that the existing arm rest has insufficient degrees of freedom and cannot perform multi-angle micro-adjustments, which limits the range of motion of the surgeon's arm during surgery and affects the accuracy and effect of the surgery.

[0007] In order to solve the above technical problems, the present invention provides an ophthalmic surgical chair, including a seat plate, a backrest is arranged at the rear end of the seat plate, and a headrest is arranged on the backrest; a seat base is arranged below the seat plate body, a fixing ring is arranged on the upper part of the seat base body, and an arm support mechanism is slidably installed on the fixing ring, the upper support plate in the arm support mechanism is used to press against the arm and support and lift the arm, and a ball is installed on the lower surface of the upper support plate body for fine-tuning the direction of the upper support plate body.

[0008] A further improvement of the technical solution of the present invention is that the arm support mechanism also includes a lower shaft rod, the lower shaft rod body is an arc-shaped body, and a fixing groove is arranged at the lower end of the lower shaft rod body. The fixing groove is slidably installed on the fixing ring through a screw rod adapting to a bolt hole.

[0009] A further improvement of the technical solution of the present invention is that the upper end of the lower shaft rod body is fixedly connected to the middle shaft rod, the upper end of the middle shaft rod body is axially connected to the rotating shaft, the rotating shaft body is fixedly connected to the upper shaft rod, the upper end of the upper shaft rod body is axially connected to the rotating shaft A, and the rotating shaft A body is fixedly connected to the arm support mechanism.

[0010] A further improvement of the technical solution of the present invention is that the arm support mechanism also includes a lower support plate, a ball groove is arranged in the middle of the lower support plate body, and the ball groove is adapted to the ball installed on the lower surface of the upper support plate body.

[0011] A further improvement of the technical solution of the present invention is that the ball is adapted to be installed in the inner groove of the rotating shaft, the rotating shaft is a special-shaped structure, and a through hole is set at the bottom end of the rotating shaft body, and the ball is adapted to roll in 1 / 3 of the body of the ball in the through hole.

[0012] A further improvement of the technical solution of the present invention is that a plurality of steel balls are evenly distributed in the inner cavity of the inner groove body, and the steel balls are pressed against the ball body.

[0013] A further improvement of the technical solution of the present invention is that the top surface of the rotating shaft body is adapted and fixedly connected to the bottom surface of the upper supporting plate body, the upper supporting plate and the lower supporting plate are connected through a rubber ring, and the rotating shaft is adapted in the inner cavity of the rubber ring.

[0014] A further improvement of the technical solution of the present invention is that the rotating shaft also includes a sleeve, one end of the sleeve body is adapted to the internal thread to be screwed to the middle shaft rod through the external thread A, the internal thread A of the middle shaft rod body is adapted to the top screw at the other end of the sleeve body, and the external thread of the top screw body is adapted to the internal thread A.

[0015] A further improvement of the technical solution of the present invention is that the internal thread of the sleeve body is adapted to the external thread A, and the internal thread A of the middle shaft body is adapted to the external thread on the top screw; the structure and size of the rotating shaft and the rotating shaft A are the same, and the installation directions of the rotating shaft and the rotating shaft A are perpendicular to each other.

[0016] A further improvement of the technical solution of the present invention is that the seat base is a special-shaped structure, an arc-shaped fixing ring is arranged at the rear end of the upper part of the seat base, both ends of the fixing ring body are fixedly connected to the seat base, and an armrest is installed at the front end of the upper part of the seat base, and the armrest is respectively installed on both sides of the seat plate.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects:

[0018] 1. The present invention provides an ophthalmic surgical chair, in which the arm support mechanism provides a stable support platform for the arms of the attending physician during a long operation, thereby reducing the trembling of the attending physician's arms, improving the accuracy of surgical operations and the success rate of operations; at the same time, it reduces the soreness and numbness of the arms caused by keeping the arms suspended for a long time. The arm support mechanism can effectively relieve the tension of the arm muscles, making them relaxed, which is conducive to the smooth progress of the operation.

[0019] 2. The present invention provides an ophthalmic surgical chair, in which the ball bearings in the arm support mechanism can rotate 360 ​​degrees on a plane, greatly improving the rotation freedom of the upper support plate. In conjunction with the rubber ring, the upper support plate can be fine-adjusted at multiple angles according to the needs of the arm, thereby realizing the range of motion of the attending physician during the surgical operation, facilitating the attending physician to make fine adjustments to his arms, and enabling the attending physician to maintain a relatively comfortable body position and arm posture throughout the operation, thereby facilitating the smooth progress of the operation.

[0020] 3. The present invention provides an ophthalmic surgical chair, in which multiple rotating shafts can realize multiple axial adjustments of the upper shaft rod and the middle shaft rod in the arm support mechanism, so that the attending physician can maintain a relatively comfortable body position and arm posture during the entire operation, which is conducive to the smooth progress of the operation; at the same time, the rotating shafts are designed with mutual threaded adaptation and nesting, which greatly improves the firmness and stability of the rotating shafts, and allows the attending physician to maintain a relatively comfortable body position and arm posture, thereby improving the accuracy and efficiency of the operation.

[0021] 4. The present invention provides an ophthalmic surgical chair, in which the lower shaft rod is movably mounted on a fixed ring. The lower shaft rod can be rotated 0-270 degrees as required, and the position of the arm support mechanism can be adjusted according to the needs of the operation, which is more conducive to the operation; the fixed ring is located behind the backrest and is on the same horizontal plane as the seat plate. The fixed ring does not affect the angle of the backrest, which is beneficial to the range of motion of the attending physician during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a surgical chair for ophthalmology;

[0024] Figure 2 The figure is a schematic diagram of the overall structure of an ophthalmic surgical chair;

[0025] Figure 3 It is a structural schematic diagram of the lower shaft rod and the arm support mechanism;

[0026] Figure 4 It is a structural schematic diagram of an upper support plate and a lower support plate;

[0027] Figure 5 It is a structural schematic diagram of the lower shaft rod and the lower supporting plate;

[0028] Figure 6 It is a partial enlarged structural schematic diagram of the shaft sleeve and the top screw rod;

[0029] Figure 7 It is a partial enlarged structural schematic diagram of the shaft sleeve and the external thread A;

[0030] Figure 8 It is a partial enlarged structural schematic diagram of the rubber ring and the lower support plate;

[0031] Fig. 9 It is a schematic diagram of the structure of the rotating shaft and the inner groove;

[0032] Fig.10 It is a schematic diagram of the structure of the ball and the rotating shaft;

[0033] Fig.11 It is a schematic diagram of the structure of the steel ball and the inner groove;

[0034] Fig.12 It is a schematic diagram of the cross-sectional structure of the steel ball and the rolling ball.

[0035] 1. Seat plate; 2. Backrest; 3. Headrest; 4. Arm support mechanism; 5. Seat base; 6. Fixing ring; 7. Armrest; 41. Lower shaft; 42. Fixing groove; 43. Bolt hole; 44. Rotating shaft; 45. Rotating shaft A; 46. Arm support mechanism; 47. Middle shaft; 48. Upper shaft; 440. Bushing; 441. Top screw; 442. External thread; 443. Internal thread; 444. External thread A; 445. Internal thread A; 460. Lower support plate; 461. Upper support plate; 462. Ball groove; 463. Rubber ring; 464. Rotating shaft; 465. Perforation; 466. Ball; 467. Inner groove; 468. Steel ball. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention is further explained below in conjunction with specific implementation modes.

[0040] like Figure 1-12As shown, the present embodiment provides an ophthalmic surgical chair, comprising a seat plate 1, a backrest 2 is arranged at the rear end of the seat plate 1, and a headrest 3 is arranged on the backrest 2; a seat base 5 is arranged below the main body of the seat plate 1, the main body of the seat base 5 is a special-shaped structure, a fixing ring 6 is arranged on the upper part of the main body of the seat base 5, an arc-shaped fixing ring 6 is arranged at the rear end of the upper part of the seat base 5, both ends of the main body of the fixing ring 6 are fixedly connected to the seat base 5, and an armrest 7 is installed at the front end of the upper part of the main body of the seat base 5, and the armrest 7 is respectively installed on both sides of the seat plate 1; an arm support mechanism 4 is installed on the fixing ring 6 for sliding, the upper support plate 461 in the arm support mechanism 4 is used to abut against the arm and support and lift the arm, and a ball bearing 466 is installed on the lower surface of the main body of the upper support plate 461 for fine adjustment of the direction of the main body of the upper support plate 461; the ball bearing 466 is suitable for A ball groove 462 is provided in the middle of the body of the lower support plate 460, and the ball groove 462 is adapted to the ball 466 installed on the lower surface of the body of the upper support plate 461, and the ball 466 is adapted to be installed in the inner groove 467 in the rotating shaft 464. The rotating shaft 464 is a special-shaped structure, and a through hole 465 is provided at the bottom end of the body of the rotating shaft 464, and the ball 466 is adapted to roll at 1 / 3 of the body of the through hole 465, and 1 / 3 of the balls 466 are adapted to roll in the ball groove 462 provided in the middle of the body of the lower support plate 460, and the upper support plate 461 and the lower support plate 460 are connected by a rubber ring 463, and the rubber ring 463 is an existing product on the market and is not described here. The user can set the rubber ring 463 according to the distance between the diameters of the upper support plate 461 and the lower support plate 460. 63, the upper surface of the upper support plate 461 body is adapted to the arm of the attending physician, the overall height of the rubber ring 463 in this embodiment is at least 2 cm, the rotating shaft 464 is adapted to be installed in the inner cavity of the rubber ring 463, and the inner cavity of the inner groove 467 in the rotating shaft 464 body is evenly distributed with a plurality of steel balls 468, and the steel balls 468 are laid in a layer in the inner groove 467 so that the steel balls 468 evenly abut against the ball 466 body, and the top surface of the rotating shaft 464 body is adapted to be fixed on the bottom surface of the upper support plate 461 body, and the outer diameter of the rotating shaft 464 is smaller than the inner diameter of the rubber ring 463, and the ball 466 is adapted to roll in multiple directions on the plane in the ball groove 462, and the two ends of the rubber ring 463 body are respectively connected By connecting the upper support plate 461 and the lower support plate 460, the attending physician only needs to slightly change the direction of the arm when making fine adjustments to the arm, and the arm will drive the upper support plate 461 to shift in direction. Limited by the height of the rubber ring 463 and the size of the upper support plate 461, either side of the upper support plate 461 body is always in contact with the upper surface of the lower support plate 460 body. The overall size of the upper support plate 461 is smaller than that of the lower support plate 460, which is convenient for the upper support plate 461 to perform fine adjustments at multiple angles, greatly improving the freedom of rotation of the upper support plate, realizing the range of activities of the attending physician during the surgical operation, and facilitating the attending physician to perform fine adjustments to the arm, so that the attending physician can maintain a relatively comfortable body position and arm posture throughout the operation, which is conducive to the smooth progress of the operation.

[0041] like Figure 2-Figure 5 As shown, in this embodiment, the arm support mechanism 4 also includes a lower shaft rod 41, and the body of the lower shaft rod 41 is an arc-shaped body. A fixing groove 42 is arranged at the lower end of the body of the lower shaft rod 41, and the fixing groove 42 is slidably installed on the fixing ring 6 through a screw (not shown) adapted to a bolt hole 43. A screw hole 43 is arranged at the lower part of the body of the lower shaft rod 41, which is convenient for medical staff to disassemble and install. The lower shaft rod 41 is adapted to slide in the fixing ring 6, and the lower shaft rod 41 can be rotated 0-270 degrees according to the needs of the attending physician to adjust the position of the arm support mechanism 4. Adjustment is more conducive to the operation; the upper end of the lower shaft rod 41 is fixedly connected to the middle shaft rod 47, the upper end of the middle shaft rod 47 is axially connected to the rotating shaft 44, the rotating shaft 44 is fixedly connected to the upper shaft rod 48, the upper end of the upper shaft rod 48 is axially connected to the rotating shaft A45, and the rotating shaft A45 is fixedly connected to the arm support mechanism 46; the middle shaft rod 47 and the upper shaft rod 48 can be adjusted in multiple axes, so that the attending surgeon can maintain a relatively comfortable body position and arm posture during the entire operation, so that his arms are in a relaxed state, which is conducive to the smooth progress of the operation.

[0042] like Figure 3 , Figure 6 , Figure 7 As shown, in this embodiment, the rotating shaft 44 also includes a sleeve 440, one end of the sleeve 440 body is threadedly connected to the middle shaft rod 47 through an external thread A444 adapted to an internal thread 443, the middle shaft rod 47 body internal thread A445 adapted to the top screw 441 at the other end of the sleeve 440 body, and the top screw 441 body external thread 442 adapted to the internal thread A445; the sleeve 440 body internal thread 443 adapted to the external thread A444, the middle shaft rod 47 body internal thread A445 adapted to the external thread 442 on the top screw 441; the rotating shaft 44 and the rotating shaft A45 have the same structure and size, and the rotating shaft 44 and The installation directions of the rotating shaft A45 are perpendicular to each other; the body of the central axis rod 47 in the sleeve 440 is provided with an internal thread A445, and the internal thread A445 is adapted to fix the top screw 441. The top screw 441, the sleeve 440 and the central axis rod 47 are adapted and nested with each other, which greatly improves the stability of the axial connection between the central axis rod 47 and the upper axis rod 48, and improves the accuracy of the surgical operation. At the same time, the rotating shaft 44 in the central axis rod 47 and the upper axis rod 48 can be adjusted at multiple angles, so that the attending physician can maintain a relatively comfortable body position and arm posture during the entire operation, which helps the smooth progress of the operation.

[0043] The present invention also provides a working principle of an ophthalmic surgical chair:

[0044] The patient lies down or leans on the backrest, and the patient's head is in a suitable position and state for the headrest. The attending physician rotates the arm support mechanism to a suitable position by sliding the lower shaft rod, and the attending physician puts the suspended arm or the trembling arm on the upper support plate. When the arm needs to slightly adjust the direction or orientation, the attending physician slightly applies force in the adjustment direction, and the upper support plate is tilted and slightly moved. The distance of the tilt micro-movement is affected by the height of the rubber ring connected between the upper support plate and the lower support plate. A rotating shaft is installed in the rubber ring, and a layer of multiple small steel balls is evenly laid in the inner groove in the rotating shaft. The small steel balls are pressed against the balls. The multiple small steel balls in the inner groove further improve the rolling or sliding performance of the balls. The lower 1 / 3 of the ball body is adapted to be perforated, and the inner diameter of the perforation limits the falling of the balls, and 1 / 3 of the balls are adapted to the ball groove in the lower support plate. When the attending physician needs to slightly adjust the orientation, the balls can easily rotate or roll under the action of the ball groove and the steel balls. , so that the edge of the upper support plate body is pressed against the lower support plate, thereby completing the micro-adjustment of the arm. The upper support plate can rotate 360 ​​degrees on the plane, which greatly improves the freedom of rotation of the upper support plate and realizes the range of activities of the attending physician during the surgical operation, so that the attending physician can maintain a relatively comfortable body position and arm posture during the entire operation. The middle axis rod and the upper axis rod in the arm support mechanism are equipped with a rotating shaft, and the external thread A of the middle axis rod is equipped in the rotating shaft, and the internal thread A is adapted in the inner cavity of the external thread A. The internal thread A is adapted to the top screw, and the rotating shaft is fixed by mutual adaptation and nesting, which greatly improves the stability of the upper axis rod, the middle axis rod and the lower axis rod. At the same time, the upper axis rod, the middle axis rod and the lower axis rod can perform multi-axial angle adjustment, which further improves the freedom of rotation of the upper support plate, and realizes the attending physician to maintain a relatively comfortable body position and arm posture during the operation, which greatly improves the accuracy and efficiency of the operation.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A surgical chair for ophthalmology, characterized in that: The invention comprises a seat plate (1), a backrest (2) is arranged at the rear end of the seat plate (1), and a headrest (3) is arranged on the backrest (2); a seat base (5) is arranged below the seat plate (1), a fixing ring (6) is arranged on the upper part of the seat base (5), an arm support mechanism (4) is slidably mounted on the fixing ring (6), an upper support plate (461) in the arm support mechanism (4) is used to abut against the arm and support and lift the arm, and a ball bearing (466) is installed on the lower surface of the upper support plate (461) body for fine-tuning the direction of the upper support plate (461) body.

2. The surgical chair for ophthalmology according to claim 1, characterized in that: The arm support mechanism (4) also includes a lower shaft rod (41), the main body of the lower shaft rod (41) is an arc-shaped body, and a fixing groove (42) is arranged at the lower end of the main body of the lower shaft rod (41), and the fixing groove (42) is slidably mounted on the fixing ring (6) through a screw rod adapting a bolt hole (43).

3. The surgical chair for ophthalmology according to claim 2, characterized in that: The upper end of the lower shaft rod (41) body is fixedly connected to the middle shaft rod (47), the upper end of the middle shaft rod (47) body is axially connected to the rotating shaft (44), the rotating shaft (44) body is fixedly connected to the upper shaft rod (48), the upper end of the upper shaft rod (48) body is axially connected to the rotating shaft A (45), and the rotating shaft A (45) body is fixedly connected to the arm support mechanism (46).

4. The surgical chair for ophthalmology according to claim 3, characterized in that: The arm support mechanism (46) further comprises a lower support plate (460), wherein a ball groove (462) is arranged in the middle of the body of the lower support plate (460), and the ball groove (462) is adapted to fit the ball (466) installed on the lower surface of the body of the upper support plate (461), and the overall size of the body of the upper support plate (461) is smaller than the overall size of the body of the lower support plate (460).

5. The surgical chair for ophthalmology according to claim 4, characterized in that: The ball (466) is adapted to be installed in the inner groove (467) in the rotating shaft (464). The rotating shaft (464) is a special-shaped structure, and a through hole (465) is set at the bottom end of the rotating shaft (464) body. The ball (466) is adapted to roll in 1 / 3 of the body of the through hole (465).

6. The surgical chair for ophthalmology according to claim 5, characterized in that: A plurality of steel balls (468) are evenly distributed in the inner cavity of the inner groove (467), and the steel balls (468) are pressed against the body of the ball bearing (466).

7. The surgical chair for ophthalmology according to claim 5, characterized in that: The top surface of the rotating shaft (464) body is adapted and fixedly connected to the bottom surface of the upper supporting plate (461) body. The upper supporting plate (461) and the lower supporting plate (460) are connected via a rubber ring (463). The rotating shaft (464) is adapted in the inner cavity of the rubber ring (463).

8. The surgical chair for ophthalmology according to claim 2, characterized in that: The rotating shaft (44) further comprises a shaft sleeve (440), one end of the shaft sleeve (440) body being threadedly connected to the middle shaft rod (47) via an external thread A (444) adapted to an internal thread (443), the internal thread A (445) of the middle shaft rod (47) body being adapted to a top screw rod (441) at the other end of the shaft sleeve (440) body, and the external thread (442) of the top screw rod (441) body being adapted to the internal thread A (445).

9. The surgical chair for ophthalmology according to claim 8, characterized in that: The internal thread (443) of the shaft sleeve (440) is adapted to the external thread A (444), and the internal thread A (445) of the middle shaft (47) is adapted to the external thread (442) on the top screw (441); the structure and size of the rotating shaft (44) and the rotating shaft A (45) are the same, and the installation directions of the rotating shaft (44) and the rotating shaft A (45) are perpendicular to each other.

10. The surgical chair for ophthalmology according to claim 1, characterized in that: The seat base (5) is a special-shaped structure, wherein an arc-shaped fixing ring (6) is arranged at the rear end of the upper part of the seat base (5), and both ends of the fixing ring (6) are fixedly connected to the seat base (5), while an armrest (7) is arranged at the front end of the upper part of the seat base (5), and the armrest (7) is respectively arranged on the two sides of the seat plate (1).

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