CN215019253U - General anesthesia head support - Google Patents

Abstract

The application discloses general anesthesia head support, which comprises a fixed base, first outer tube is installed at the fixing base top, the inside slidable mounting of first outer tube has first inner tube, first mounting is installed to first outer tube lateral wall, first inner tube outer wall is installed and is adjusted the pole, adjust the pole other end and install the horizontal pole, the fixed block is all installed at the horizontal pole both ends, the screw rod is all installed to the fixed block lateral wall, flexible piece is installed jointly to a plurality of screw rod thread end tip, the screw thread post is all installed to two fixed block lateral walls, the arc is all installed to two screw thread post one ends, two telescopic links are installed to two arc lateral walls, the equal slidable mounting of the telescopic link other end is in the fixed block, two nuts are installed in the rotation of screw thread post lateral wall. This scheme can be fixed to different head types, saves the resource of hospital, and through diversified fixing, the effectual phenomenon that the head that prevents disease after fixed still can move about is convenient for subsequent operation and is resumeed.

Description

General anesthesia head support

Technical Field

The application relates to the technical field of medical equipment, in particular to a general anesthesia head support.

Background

The medical apparatus refers to instruments, equipment, appliances, in-vitro diagnostic reagents and calibrators, materials and other similar or related articles directly or indirectly applied to the human body, and comprises required computer software, wherein the effects are mainly obtained in a physical mode and other modes, not in a pharmacological, immunological or metabolic mode, or are only assisted by the modes, so that the diagnosis, prevention, monitoring, treatment or alleviation of diseases are achieved; diagnosis, monitoring, treatment, mitigation, or functional compensation of injury; examination, replacement, regulation or support of a physiological structure or physiological process; support or maintenance of life; controlling pregnancy; the general anesthesia, general anesthesia for short, general anesthesia, is examined to provide information for medical or diagnostic purposes. The anesthetic is inhaled through respiratory tract, injected into body through vein or muscle, and generates temporary inhibition of central nervous system, and clinical manifestations of the anesthetic are mental disappearance, general analgesia, amnesia, reflex inhibition and skeletal muscle relaxation. The degree of inhibition of the central nervous system is related to the concentration of the drug in the blood and can be controlled and regulated. The inhibition is completely reversible, after the drug is metabolized or discharged from the body, the mind and various reflexes of the patient are gradually recovered, and after general anesthesia is performed on the patient, the head of the patient needs to be fixed, so that the operation on the patient is facilitated.

However, the existing head fixing support cannot fix different head types, so that hospitals need to prepare head fixing supports of various types, and great waste is caused to resources.

SUMMERY OF THE UTILITY MODEL

It is a primary object of the present application to provide a general anesthetic head support to improve the problems of the related art.

In order to achieve the purpose, the application provides a general anesthesia head support, which comprises a fixed seat, wherein a first outer pipe is installed at the top of the fixed seat, a first inner pipe is installed inside the first outer pipe in a sliding manner, a through hole is formed in the side wall of the first outer pipe, a first fixing piece is installed at the position, close to the through hole, of the first outer pipe, one end of the first fixing piece is abutted against the outer wall of the first inner pipe, an adjusting rod is installed on the outer wall of the first inner pipe, a cross rod is installed at the other end of the adjusting rod, fixed blocks are installed at two ends of the cross rod, a plurality of threaded holes are formed in the two fixed blocks, a screw rod is installed at the position, close to the side wall of the threaded hole, a flexible block is installed at the end part of the threaded end of the screw rod together, a plurality of screw rods are installed on the flexible block in a rotating manner, threaded columns are installed on the side walls of the two fixed blocks in a sliding manner, two the arc is all installed to the close one end of screw thread post distance, two telescopic links are installed to the arc lateral wall, the screw thread post is in two between the telescopic link, the equal slidable mounting of telescopic link other end in the fixed block, screw thread post lateral wall rotates and installs two nuts, the fixed block is in two between the nut.

In an embodiment of the present application, a plurality of through holes are opened at the top of the bottom of the fixing base, bolts are installed on the fixing base near the through holes, and the number of the bolts is equal to that of the through holes.

In an embodiment of the present application, the first fixing member includes a threaded rod, a connecting block and an insert rod, the connecting block is installed at an end of the threaded rod, and the insert rod is installed at a side wall of the connecting block.

In an embodiment of this application, the tip of threaded rod with the outer wall of first inner tube is inconsistent, the connecting block lateral wall seted up with inserted bar complex through-hole, the inserted bar periphery is cup jointed and is installed two spacing rings, the connecting block is in two between the spacing ring.

In an embodiment of the present application, the adjusting rod includes a second outer tube, a second inner tube and a second fixing member, the second outer tube is installed on the side wall of the first inner tube, the second inner tube is slidably installed on the inner wall of the second outer tube, the second fixing member is installed on the side wall of the second outer tube, one end of the second fixing member is abutted to the outer wall of the second inner tube, and a cross bar is installed at the end of the second inner tube.

In an embodiment of this application, the second mounting includes second threaded rod, second connecting block and second inserted bar, the tip of second threaded rod with the lateral wall of second inner tube is inconsistent, the second connecting block install in the other end of second threaded rod, the through hole has been seted up to second connecting block lateral wall, the second inserted bar install in the second connecting block is close to pass through hole department.

In an embodiment of this application, the second inserted bar periphery cup joints and installs two second spacing collars, the second connecting block is in two between the second spacing collar.

In one embodiment of the present application, the cross bar and the two fixing blocks form a U shape.

In an embodiment of the present application, a sliding groove engaged with the telescopic rod is formed in a sidewall of the fixed block, and a slot hole engaged with the threaded post is formed in the sidewall of the fixed block.

In an embodiment of this application, the telescopic link includes third inner tube and third outer tube, the third outer tube cup joint install in the third inner tube, the slider is installed to the tip of third outer tube, the slider passes through spout slidable mounting in the fixed block, the lateral wall of third inner tube with the lateral wall of arc links to each other.

Compared with the prior art, the beneficial effects of this application are: through the general anesthesia head support of the design, when in use, the fixing seat is placed at the head part of a patient's bed, the first inner tube is pulled at the moment, the height of the adjusting rod is raised to be flush with the head part of the patient, then the first inner tube is fixed through the first fixing part, then the adjusting rod is arranged, the two fixing blocks are positioned at the two sides of the head part of the patient, then the screw rod is adjusted, the flexible block is close to the face part of the patient and is attached to the face part of the patient, the left and right directions of the head part of the patient are limited, and the flexible block is easy to deform, so that the head shape with a large face or the head shape with a small face is suitable, the problem that a hospital needs to prepare head fixing supports with various types is effectively avoided, resources are saved, after the flexible block is fixed, the arc plate is adjusted through the telescopic rod in a sliding mode, the side wall of the arc plate is opposite to the head part of the patient, and then the side wall of the arc plate is attached to the head part of the patient, the lateral wall that two rotatory nuts of relative direction made the nut all offsets with the lateral wall of fixed block, and then make the screw thread post fix the lateral wall at the fixed block, and then accomplish the fixed to the arc board, and then accomplish the fixed to the disease head, cooperation through arc and flexible piece, the flexible piece is spacing to the direction about the patient head, the arc carries on spacingly with the sick bed to the direction about the patient head, can be diversified fix the head to the disease, and then the effectual head that prevents the disease leads to the phenomenon that can also rock because of fixed comprehensive, facilitate for the subsequent operation of performing the operation, and slide the arc through the telescopic link, make the arc can adapt to the head type of long face or short face, the effectual head fixed bolster that has avoided the hospital to prepare multiple model, and then save the resource.

Drawings

Fig. 1 is a schematic front sectional view of a general anesthesia head support according to an embodiment of the present application;

FIG. 2 is a schematic top view of the cross-sectional structure of FIG. 1A;

FIG. 3 is a schematic cross-sectional view taken at D-D in FIG. 2;

FIG. 4 is an enlarged view of the point B in FIG. 1;

fig. 5 is an enlarged schematic view of C in fig. 1.

In the figure: 1. a fixed seat; 2. a first outer tube; 3. a first inner tube; 4. a through hole; 5. a first fixing member; 6. adjusting a rod; 7. a cross bar; 8. a fixed block; 9. a threaded hole; 10. a screw; 11. a flexible block; 12. a threaded post; 13. an arc-shaped plate; 14. a telescopic rod; 15. a nut; 16. a bolt; 17. a threaded rod; 18. connecting blocks; 19. inserting a rod; 20. a limiting ring; 21. a second outer tube; 22. a second inner tube; 23. a second fixing member; 24. a second threaded rod; 25. a second connecting block; 26. a second plunger; 27. a second limit ring; 28. a chute; 29. a slot; 30. a third inner tube; 31. a third outer tube; 32. a slide block.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

In addition, the term "plurality" shall mean two as well as more than two.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example 1

Referring to fig. 1-5, the present application provides a general anesthesia head support, which comprises a fixing base 1, wherein during the specific implementation, a plurality of through holes are formed at the top of the bottom of the fixing base 1, bolts 16 are installed at positions of the fixing base 1 adjacent to the through holes, the number of the bolts 16 is equal to that of the through holes, the fixing base 1 is fixedly connected with the ground through the bolts 16, the situation that the head of a patient is deviated due to deviation of the fixing base 1 during the use is effectively avoided, and further, the operation is effectively ensured, a first outer tube 2 is welded and installed at the top of the fixing base 1, a first inner tube 3 is slidably installed inside the first outer tube 2, a through hole 4 is formed in the side wall of the first outer tube 2, during the specific implementation, the through hole 4 is a threaded hole, a first fixing member 5 is threadedly installed at a position of the first outer tube 2 adjacent to the through hole 4, the through hole 4 is convenient for installation of the first fixing member 5, one end of the first fixing member 5 is abutted against the outer wall of the first inner tube 3, in specific implementation, the height of the top of the first inner tube 3 from the ground can be adjusted by pulling the first inner tube 3, after the adjustment is completed, the side wall of the first fixing part 5 is abutted against the side wall of the first inner tube 3 by rotating the first fixing part 5, so that the limitation and fixation of the first inner tube 3 are completed, the outer wall of the first inner tube 3 is welded and installed with an adjusting rod 6, the other end of the adjusting rod 6 is installed with a cross rod 7 by using a screw, two ends of the cross rod 7 are both installed with fixing blocks 8 by using screws, in specific implementation, the cross rod 7 and the two fixing blocks 8 form a U shape, so as to wrap the head of a patient and further facilitate subsequent work, the two fixing blocks 8 are both provided with a plurality of threaded holes 9, the side walls of the fixing blocks 8 adjacent to the threaded holes 9 are both provided with threaded screws 10, the end parts of the threaded ends of the plurality of the screws 10 are both provided with flexible blocks 11, in specific implementation, the flexible blocks 11 are silica gel blocks, the flexible fixing block is soft, when the head of a patient is fixed, the head of the patient cannot be injured, the plurality of screw rods 10 are rotatably installed on the flexible block 11, in the specific implementation, the distance between the side wall of the flexible block 11 and the face of the patient can be adjusted by rotating the screw rods 10, the head of the patient is further fixed, deformation is easy to occur due to the soft characteristic of the flexible block 11, further more areas can be attached to the head of the patient under the action of the screw rods 10, different head types can be adapted, a plurality of head fixing supports do not need to be prepared by a hospital, hospital resources are saved, threaded columns 12 are slidably installed on the side walls of the two fixing blocks 8, arc-shaped plates 13 are welded and installed at the ends, close to the distance, of the two threaded columns 12, in the specific implementation, the arc-shaped plates 13 are arc-shaped rubber plates and simulate the arc shape of the head of the human body, the head of the patient can be conveniently clamped, two telescopic rods 14 are welded and installed on the side walls of the two arc-shaped plates 13, the threaded column 12 is arranged between the two telescopic rods 14, the other ends of the telescopic rods 14 are slidably mounted on the fixed block 8, in specific implementation, a sliding groove 28 matched with the telescopic rod 14 is formed in the side wall of the fixed block 8, a slotted hole 29 matched with the threaded column 12 is formed in the side wall of the fixed block 8, the telescopic rod 14 and the threaded column 12 can slide conveniently, two nuts 15 are mounted on the side wall of the threaded column 12 in a threaded manner, the fixed block 8 is arranged between the two nuts 15, in specific implementation, the threaded column 12 slides through the slotted hole 29 to enable the arc-shaped plate 13 to slide, when the arc-shaped plate 13 slides to the head of a patient, the threaded column 12 is pushed to the head of the patient, at the moment, the telescopic rod 14 extends to enable the arc-shaped plate 13 to be close to the head of the patient, the head of the patient is clamped, at the moment, the left and right directions of the head of the patient are limited by the flexible block 11, the arc-shaped plate 13 limits the upper and the lower directions of the head of the patient, and effectively solves the problem that the existing head fixing bracket fixes the head of the patient, the head of disease still can rock the problem, and then subsequent operation work of being convenient for, and through sliding arc 13 for arc 13 can carry out the centre gripping to the head of different length, and the effectual head fixed bolster of having avoided the hospital to prepare multiple model, and then practices thrift the resource of hospital.

In this embodiment, the first fixing member 5 includes a threaded rod 17, a connecting block 18 and an inserting rod 19, the connecting block 18 is welded and installed at an end of the threaded rod 17, the inserting rod 19 is installed on a side wall of the connecting block 18, in specific implementation, a through hole matched with the inserting rod 19 is formed in a side wall of the connecting block 18, an end of the threaded rod 17 abuts against an outer wall of the first inner tube 3, two limiting rings 20 are sleeved and installed on an outer periphery of the inserting rod 19, in specific implementation, the limiting rings 20 are rubber rings, the connecting block 18 is located between the two limiting rings 20, in specific implementation, the threaded rod 17 is in threaded connection with the through hole 4, when the end of the threaded rod 17 abuts against a side wall of the first inner tube 3, fixing of the first inner tube 3 is completed, the inserting rod 19 provides a stress point for medical personnel, so as to facilitate rotation of the threaded rod 17, the two limiting rings 20 are used for limiting the inserting rod 19, so that the inserting rod 19 is located in the through hole of the connecting block 18 and cannot drop, and the inserted rod 19 is convenient to disassemble, thereby being convenient to clean and sterilize.

In this embodiment, the adjusting rod 6 includes a second outer tube 21, a second inner tube 22 and a second fixing member 23, the second outer tube 21 is welded to the side wall of the first inner tube 3, the second inner tube 22 is slidably mounted to the inner wall of the second outer tube 21, the second fixing member 23 is mounted to the side wall of the second outer tube 21, one end of the second fixing member 23 abuts against the outer wall of the second inner tube 22, the cross bar 7 is mounted at the end of the second inner tube 22, in specific implementation, the distance between the cross bar 7 and the head of the patient is adjusted by pulling the second inner tube 22, further adjusting the distance between the flexible block 11 and the head of the patient, facilitating the clamping of the head of the patient, after the adjustment is completed, the second fixing member 23 is rotated to fix and limit the second inner tube 22, thereby effectively avoiding the problem that the second inner tube 22 may cause medical accidents when sliding after the flexible block 11 clamps the head of the patient.

In this embodiment, the second fixing member 23 includes a second threaded rod 24, a second connecting block 25 and a second inserting rod 26, an end of the second threaded rod 24 abuts against a side wall of the second inner tube 22, in a specific implementation, the end of the second threaded rod 24 is separated from the side wall of the second inner tube 22, the second inner tube 22 is adjusted, after the distance of the second inner tube 22 is adjusted, the end of the second threaded rod 24 abuts against the side wall of the second inner tube 22, so as to complete the position limitation and the fixing of the second inner tube 22, the second connecting block 25 is welded and installed at the other end of the second threaded rod 24, a through hole is formed in the side wall of the second connecting block 25, the second inserting rod 26 is installed at a position near the through hole of the second connecting block 25, in a specific implementation, two second limiting rings 27 are installed on the periphery of the second inserting rod 26 in a sleeved manner, the second limiting ring 27 is a rubber ring, the second connecting block 25 is located between the two second limiting rings 27, the two second limiting rings 27 are used for limiting the second insertion rod 26, so that the second insertion rod 26 cannot fall off in the through hole of the second connecting block 25, and the second insertion rod 26 is convenient to detach, and is convenient to clean and sterilize.

In this embodiment, the telescopic rod 14 includes a third inner tube 30 and a third outer tube 31, the third outer tube 31 is sleeved on the third inner tube 30, a slider 32 is installed at the end of the third outer tube 31, the slider 32 and the third outer tube 31 are of an integral structure, the slider 32 is slidably installed on the fixing block 8 through the sliding groove 28, the side wall of the third inner tube 30 is connected with the side wall of the arc-shaped plate 13, in specific implementation, when the arc-shaped plate 13 is close to the head of a patient, the third inner tube 30 slides inside the third outer tube 31, on one hand, the arc-shaped plate 13 is fixed, and on the other hand, the arc-shaped plate 13 is prevented from falling off when not in use.

Specifically, the general anesthesia head support has the working principle that: when the fixing base is used, the fixing base 1 is placed at the head of a bed of a patient, the first inner tube 3 is pulled at the moment, the height of the adjusting rod 6 is increased to be flush with the head of the patient, then the first inner tube 3 is fixed through the first fixing piece 5, then the adjusting rod 6 is arranged, the two fixing blocks 8 are located at two sides of the head of the patient, the screw rod 10 is adjusted, the flexible block 11 is close to the face of the patient and is attached to the face of the patient, the left and right directions of the head of the patient are limited, the flexible block 11 is easy to deform, the head with a large face or the head with a small face is suitable, the problem that a hospital needs to prepare head fixing supports with various types is effectively solved, resources are saved, after the flexible block 11 is fixed, the arc-shaped plate 13 is adjusted through the telescopic rod 14 in a sliding mode, the side wall of the arc-shaped plate 13 is opposite to the head of the patient, then the side wall of the arc-shaped plate 13 is attached to the head of the patient, rotatory two nuts 15 of relative direction make the lateral wall of nut 15 all inconsistent with the lateral wall of fixed block 8, and then make threaded column 12 fix the lateral wall at fixed block 8, and then accomplish the fixed to arc 13, and then accomplish the fixed to the disease head, cooperation through arc 13 and flexible piece 11, flexible piece 11 carries on spacingly to the patient head left and right sides direction, arc 13 carries on spacingly to the disease head upper and lower direction with the sick bed, can diversified head to the disease fix, and then the effectual head that prevents the disease leads to the phenomenon that can also rock because of fixed comprehensive, facilitate for the subsequent operation of performing the operation, and slide arc 13 through telescopic link 14, make arc 13 can adapt to the head type of long face or short face, the effectual head fixed bolster that has avoided the hospital to prepare multiple model, and then save the resource.

It should be noted that: the model specifications of the flexible block 11, the limiting ring 20 and the second limiting ring 27 need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The general anesthesia head support comprises a fixing seat (1) and is characterized in that a first outer tube (2) is installed at the top of the fixing seat (1), a first inner tube (3) is installed inside the first outer tube (2) in a sliding mode, a through hole (4) is formed in the side wall of the first outer tube (2), a first fixing piece (5) is installed at the position, close to the through hole (4), of the first outer tube (2), one end of the first fixing piece (5) is abutted to the outer wall of the first inner tube (3), an adjusting rod (6) is installed on the outer wall of the first inner tube (3), a cross rod (7) is installed at the other end of the adjusting rod (6), fixing blocks (8) are installed at two ends of the cross rod (7), a plurality of threaded holes (9) are formed in the two fixing blocks (8), and a screw rod (10) is installed on the side wall, close to the threaded holes (9), of the fixing blocks (8), a plurality of screw rod (10) screw thread end tip installs flexible piece (11) jointly, and is a plurality of screw rod (10) all rotate install in flexible piece (11), two equal slidable mounting of fixed block (8) lateral wall has screw thread post (12), two arc (13), two are all installed to screw thread post (12) close one end apart from arc (13) lateral wall installs two telescopic links (14), screw thread post (12) are in two between telescopic link (14), the equal slidable mounting of telescopic link (14) other end in fixed block (8), screw thread post (12) lateral wall rotates and installs two nuts (15), fixed block (8) are in two between nut (15).

2. A general anesthesia head support according to claim 1, wherein the top of the bottom of the fixing base (1) is provided with a plurality of through holes, bolts (16) are installed at the position of the fixing base (1) adjacent to the through holes, and the number of the bolts (16) is equal to that of the through holes.

3. A general anesthetic head support according to claim 1, characterized in that the first fixing member (5) comprises a threaded rod (17), a connecting block (18) and an inserting rod (19), the connecting block (18) is mounted at the end of the threaded rod (17), and the inserting rod (19) is mounted on the side wall of the connecting block (18).

4. A general anesthesia head support according to claim 3, wherein the end of the threaded rod (17) abuts against the outer wall of the first inner tube (3), a through hole matched with the inserted link (19) is formed in the side wall of the connecting block (18), two limiting rings (20) are sleeved on the periphery of the inserted link (19), and the connecting block (18) is located between the two limiting rings (20).

5. A general anesthesia head support according to claim 1, wherein said adjusting rod (6) comprises a second outer tube (21), a second inner tube (22) and a second fixing member (23), said second outer tube (21) is mounted on the side wall of said first inner tube (3), said second inner tube (22) is slidably mounted on the inner wall of said second outer tube (21), said second fixing member (23) is mounted on the side wall of said second outer tube (21), one end of said second fixing member (23) is abutted against the outer wall of said second inner tube (22), and the end of said second inner tube (22) is mounted with a cross bar (7).

6. A general anesthesia head support according to claim 5, wherein said second fixing member (23) comprises a second threaded rod (24), a second connecting block (25) and a second inserting rod (26), the end of said second threaded rod (24) is in contact with the side wall of said second inner tube (22), said second connecting block (25) is mounted at the other end of said second threaded rod (24), the side wall of said second connecting block (25) is provided with a through hole, and said second inserting rod (26) is mounted at the position of said second connecting block (25) adjacent to the through hole.

7. A general anesthesia head support according to claim 6, wherein two second stop collars (27) are sleeved on the periphery of said second insertion rod (26), and said second connecting block (25) is located between said two second stop collars (27).

8. A general anesthetic head support according to claim 1, characterized in that said cross bar (7) and two of said fixing blocks (8) form a U-shape.

9. A general anesthetic head support according to claim 1, characterized in that the side wall of the fixing block (8) is provided with a sliding groove (28) engaged with the telescopic rod (14), and the side wall of the fixing block (8) is provided with a slot hole (29) engaged with the threaded post (12).

10. A general anesthesia head support according to claim 9, wherein said telescopic rod (14) comprises a third inner tube (30) and a third outer tube (31), said third outer tube (31) is sleeved on said third inner tube (30), a sliding block (32) is mounted at the end of said third outer tube (31), said sliding block (32) is slidably mounted on said fixing block (8) through said sliding slot (28), and the side wall of said third inner tube (30) is connected with the side wall of said arc-shaped plate (13).

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