A probe-type retractor for use in performing functional monitoring of dissected nerves

Abstract

The application discloses a medical equipment technical field, and relates to a detection type drag hook for monitoring the function of dissecting nerves, which comprises a holding handle, a telescopic rod is arranged in the holding handle, an angle adjusting rod is hingedly connected to the front end of the telescopic rod, and a fixed drag hook is fixedly connected to the front end of the angle adjusting rod. Two groups of fixed hook heads are arranged at the front end of the fixed rod body, so that the fixed rod body and the fixed hook heads can limit the nerves through the gap between the two groups of fixed hook heads when the nerves are pulled, the fixed drag hook can better pull the nerves, the nerves are not easy to be separated during the operation, a fixed sensor is arranged at the connecting position of the fixed rod body and the fixed hook head, the nerves are in contact with the fixed sensor when the fixed hook head hooks the nerves, so that the nerves are sensed by the fixed sensor, the push block is vibrated, the user can know that the device has hooked the nerves without seeing, and the operation convenience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a detection type retractor for dissecting nerves to implement function monitoring. BACKGROUND

[0002] According to the search, Chinese Patent No. CN201520101691.4 discloses a multifunctional nerve retractor, which is characterized by comprising a nerve retractor body and a hand-held handle on the nerve retractor body. The nerve retractor body is a hollow rod body with a 90° angle. The vertical hollow rod body has a light source channel parallel to it. The vertical hollow rod body is a suction channel. The light source channel is shorter than the suction channel, and the length of the light source channel is less than or equal to one-half of the vertical hollow rod body. The lower end of the suction channel is a bevelled cutout, and the bevel faces forward. A retractor groove extends 90° backward from the rear side of the bevelled cutout. A bevel protrusion is below the lower outlet of the light source channel. The upper outlet of the light source channel is located at the 90° bend of the nerve retractor body. The light source enters the light source channel through the inlet. The horizontal hollow rod body of the nerve retractor body is sleeved with the hand-held handle. The hand-held handle and the 90° bend of the nerve retractor body have a circular concave disc with an intermediate opening. The intermediate opening of the circular concave disc communicates with the suction channel.

[0003] The above-mentioned device has the advantages of "multifunctional integration, adjustable suction force, adjustable light source direction, various specifications of retractor, and individual selection", can achieve controllable lighting in a limited space, and can perform traction and suction operations without interference, thereby reducing the possibility of errors. The device does not require an additional light source channel, reduces unnecessary trauma, reduces the workload of assistants, and liberates the labor of medical personnel, thereby solving the problem of high cooperation difficulty caused by multiple operations. The device is easy to operate, does not require frequent replacement of instruments, simplifies the operation steps of the entire surgical process, reduces the unstable operation risk caused by the surgeon performing surgical operation with one hand suction and the other hand, reduces the operation time and bleeding volume, reduces the possibility of infection, improves the overall surgical quality, and improves the postoperative effect.

[0004] However, in actual application, the existing detection type retractor is often provided in a single hook head shape, which makes it impossible to perform simultaneous operation when multiple nerves need to be pulled during the detection process. In addition, when the retractor is inserted, more insertion space is required for auxiliary operation, which makes the use inconvenient. Moreover, two groups of retractors need more delicate operation to simultaneously operate two or a single nerve, which increases the operation difficulty. Therefore, we propose a detection type retractor for dissecting nerves to implement function monitoring. SUMMARY

[0005] The present application aims to provide a detection type retractor for dissecting nerves to implement function monitoring to solve the problems in the background art.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a detection type drag hook for implementing function monitoring of dissecting nerve, comprising a holding handle, a telescopic rod is inserted in the holding handle, an angle adjusting rod is hinged at the front end of the telescopic rod, a fixed drag hook is fixedly connected at the front end of the angle adjusting rod, the fixed drag hook comprises a fixed rod body connected at the front end of a rotating rod body, a fixed hook head is connected at the front end of the fixed rod body, a folding groove is arranged on the surface of the angle adjusting rod, a movable drag hook is hinged in the folding groove, the movable drag hook comprises a movable rod body hinged on the angle adjusting rod, the movable rod body is hinged at the front end of the folding groove through a movable hook head, a movable hook head is connected at the front end of the movable rod body, a groove is arranged on the surface of the movable rod body, a pull rope is connected in the groove, the front end of the pull rope is connected on the inner wall of the groove, a sliding groove is arranged in the inside of the rotating rod body, a sliding block is inserted in the sliding groove, the inner wall of the sliding groove is hinged with a rotating wheel through a fixed shaft at the front end of the sliding block, the other end of the pull rope is fixedly connected on the sliding block through the rotating wheel, a torsion spring is installed in the movable hook head, the pulling force generated by the torsion spring in the movable hook head cannot pull the sliding block to slide.

[0007] Preferably, the front end of the fixed rod body is provided with a mounting hole, and a camera is connected in the mounting hole.

[0008] Preferably, the fixed hook head is provided with two groups of symmetrically distributed fixed hook heads on the fixed rod body.

[0009] Preferably, a fixed groove is arranged at the connection position of the fixed rod body and the fixed hook head, and a fixed sensor is connected in the fixed groove, and the fixed sensor is signal connected with a vibrator installed in the push block.

[0010] Preferably, the size of the movable drag hook is matched with the size of the folding groove.

[0011] Preferably, a movable sensor is fixedly connected at the connection position of the movable rod body and the movable hook head.

[0012] Preferably, a plurality of thread holes are linearly and equidistantly arranged on the surface of the lower end of the movable rod body, a limiting block is inserted in the thread hole, and a threaded rod is connected on the surface of the limiting block.

[0013] Preferably, the size of the movable rod body is matched with the size of the gap between the two groups of fixed hook heads.

[0014] Preferably, a sliding groove is arranged on the surface of the holding handle, a push block is connected at the rear end of the telescopic rod, the push block is inserted in the sliding groove on the surface of the holding handle, a scale is arranged on the surface of the telescopic rod, and the scale is located between the sliding grooves on the surface of the holding handle.

[0015] Preferably, the front end of the telescopic rod is provided with a hinged groove, the rear end of the rotating rod body is provided with a protrusion, the size of the protrusion and the hinged groove of the front end of the telescopic rod is matched, the inside of the protrusion is provided with a round hole and the inner wall of the round hole is provided with a toothed groove, the front end of the telescopic rod is internally provided with a motor, the output shaft of the motor is in transmission connection with the central shaft internally installed in the reduction box, the hinged groove of the front end of the telescopic rod is internally inserted with a central shaft, the surface of the central shaft is respectively connected with a turbine and a central gear, the turbine and the worm are in transmission connection, the central gear is located in the toothed groove round hole in the inside of the protrusion, the hinged groove of the front end of the telescopic rod is connected with four groups of connecting shafts on the inner wall, the four groups of connecting shafts are circumferentially distributed on the outside of the central shaft, each group of connecting shafts is hingedly connected with a connecting gear, the four groups of connecting gears are located in the toothed groove round hole in the inside of the protrusion, the central gear and the four groups of connecting gears are in meshing connection, and the four groups of connecting gears are in meshing connection with the toothed groove on the inner wall of the protrusion.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1、The front end of the fixed rod body is provided with two groups of fixed hook heads, so that the fixed rod body and the fixed hook head can limit the nerve through the gap between the two groups of fixed hook heads when the nerve is pulled, further enabling the fixed hook to better pull the nerve, and the nerve is not easy to come off during operation, and a fixed sensor is installed at the connection between the fixed rod body and the fixed hook head, when the fixed hook head hooks the nerve, the nerve will be resisted on the fixed sensor and thus be sensed by the fixed sensor, at this time, the fixed sensor will transmit the signal that the fixed hook head hooks the nerve to the vibrator in the push block through wireless signal, so that the push block vibrates, further enabling the user to know that the device has hooked the nerve without seeing, improving the convenience of operation.

[0018] 2、The adjustable movable hook installed in the angle adjusting rod enables the movable hook to be folded and hidden in the folding groove when not in use, so that the device can be used as a single-head hook, and when the movable hook needs to be used, it can be rotated out of the folding groove, so that an arbitrary included angle is formed between the movable hook and the fixed hook, the fixed hook and the movable hook can hook two nerves at different positions at the same time, and can be adjusted according to the positions of the two nerves, improving the applicability, and the fixed hook and the movable hook can also be completely closed, so that the nerve is held and fixed between the closed loop formed by the fixed hook and the movable hook, the nerve position is limited, even if the user releases the control of the device, the target nerve will not come off, thus facilitating operation, and the nerve will not come off during any operation when pulling.

[0019] 3. This design features both a fixed hook and a movable hook mounted on an angle adjustment rod. The angle adjustment rod is hinged to a telescopic rod inserted inside the handle. When the user operates the device by holding the handle, the overall length of the device can be changed via the telescopic rod. The drive mechanism inside the telescopic rod can also change the angle between the telescopic rod and the angle adjustment rod, allowing the angle adjustment rod and the fixed hook to rotate at any angle on the telescopic rod. This means that during operation, when the handle is inserted into the patient's body and angle adjustment is needed, the angle of the fixed hook can be adjusted without controlling the handle itself. This avoids pressure on the patient's wound and potential injury during adjustment, or allows the device to avoid obstacles when there are obstructions in front of the target object, further improving ease of use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the unfolded movable hook structure of the present invention;

[0022] Figure 3 This is a schematic cross-sectional view of the structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the adjustment of the rotating rod structure of the present invention;

[0024] Figure 5 This is a cross-sectional view of the internal structure of the rotating rod of the present invention;

[0025] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 7 This is a partial exploded structural diagram of the present invention;

[0027] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B;

[0028] Figure 9 This is a schematic diagram of the front end structure of the movable hook of the present invention;

[0029] Figure 10 This is a schematic diagram of the front end structure of the fixed hook of the present invention.

[0030] In the figure: 1, holding handle; 2, telescopic rod; 21, motor; 22, speed reducer; 23, worm; 24, center shaft; 25, turbine; 26, center gear; 27, connecting shaft; 28, connecting gear; 29, scale; 3, angle adjusting rod; 31, rotating rod body; 32, sliding groove; 33, protrusion; 4, fixed pull hook; 41, fixed rod body; 42, fixed hook head; 43, camera; 44, fixed sensor; 5, folding groove; 6, movable pull hook; 61, movable rod body; 62, movable hook head; 63, movable sensor; 64, slot; 65, pull rope; 66, threaded hole; 67, threaded rod; 68, limiting block; 7, sliding block; 8, fixed shaft; 9, rotating wheel; 10, push block. DETAILED DESCRIPTION

[0031] Example one

[0032] Please refer to Figures 1-10 , the present application provides a technical solution:

[0033] A probe type pull hook for anatomical nerve function monitoring, the inside of the holding handle 1 is hollow, and the telescopic rod 2 is inserted in the holding handle 1, so that the length of the telescopic rod 2 and the holding handle 1 as a whole can be adjusted according to the insertion depth of the telescopic rod 2, and the front end of the telescopic rod 2 is hinged with the angle adjusting rod 3, and the fixed pull hook 4 is fixedly connected to the front end of the angle adjusting rod 3, and by adjusting the included angle between the telescopic rod 2 and the angle adjusting rod 3, the angle of the fixed pull hook 4 can be further adjusted, which is convenient for use;

[0034] The surface of the holding handle 1 is provided with a sliding groove, and the rear end of the telescopic rod 2 is connected with a push block 10, which is inserted in the sliding groove on the surface of the holding handle 1 and flush with the surface of the holding handle 1, when the user operates the device, the fixed pull hook 4 can be controlled and operated by holding the holding handle 1, and the user's thumb can push the telescopic rod 2 to slide in the holding handle 1 by pressing on the push block 10, further changing the overall length of the device, which is convenient for the fixed pull hook 4 to operate the target;

[0035] The surface of the telescopic rod 2 is provided with a scale 29, which is located between the sliding grooves on the surface of the holding handle 1, when the telescopic rod 2 slides in the holding handle 1, the position of the front end of the holding handle 1 corresponding to the scale 29 is different, the user can easily see how long the telescopic rod 2 extends, which further facilitates the operation and control of the fixed pull hook 4;

[0036] The front end of the telescopic rod 2 is provided with a hinged groove, the rear end of the rotating rod body 31 is provided with a protrusion 33, the size of the protrusion 33 and the hinged groove at the front end of the telescopic rod 2 is matched, so that the rotating rod body 31 can rotate at the front end of the telescopic rod 2, further adjust the angle between the rotating rod body 31 and the telescopic rod 2, so that when the user holds the holding handle 1 without moving, the fixed hook 4 at the front end of the angle adjusting rod 3 can also be angled, further facilitating operation;

[0037] The inside of the protrusion 33 is provided with a circular hole and the inner wall of the circular hole is provided with a toothed groove, and the front end of the telescopic rod 2 is internally mounted with a motor 21, the output shaft of the motor 21 and the center shaft 24 internally mounted in the reduction box 22 are in transmission connection, so that the motor 21 can drive the center shaft 24 to rotate, at the same time, the center shaft 24 is inserted into the hinged groove at the front end of the telescopic rod 2, and the surface of the center shaft 24 is respectively connected with a turbine 25 and a center gear 26, the turbine 25 and the worm 23 are in transmission connection, and the center gear 26 is located in the toothed groove inside the protrusion 33, and four groups of connecting shafts 27 are also connected on the inner wall of the hinged groove at the front end of the telescopic rod 2, the four groups of connecting shafts 27 are circumferentially distributed on the outside of the center shaft 24, and each group of connecting shafts 27 is hinged with a connecting gear 28, and the four groups of connecting gears 28 are also located in the toothed groove inside the protrusion 33, at the same time, the center gear 26 and the four groups of connecting gears 28 are in meshing connection, and the four groups of connecting gears 28 are also in meshing connection with the toothed groove on the inner wall of the protrusion 33, so that after the motor 21 is turned on, the turbine 25 at the front end can drive the center gear 26 to rotate, further drive the protrusion 33 to rotate through the center gear 26 meshing with the connecting gear 28, so as to control the rotating rod body 31 to rotate and adjust the angle at the front end of the telescopic rod 2;

[0038] The front end of the rotating rod body 31 is connected with a fixed rod body 41, and the front end of the fixed rod body 41 is connected with a fixed hook head 42, so that the fixed hook 4 is in the shape of "L", thereby facilitating pulling and hooking the nerve, and the fixed hook head 42 is provided with two groups of symmetrically distributed fixed hook heads 42 on the fixed rod body 41, so that the gap between the two groups of fixed hook heads 42 can clamp the nerve with a size matched, further facilitating the limiting and fixing of the nerve that needs to be pulled, preventing the nerve from falling off during operation, through the setting of the holding handle 1, the telescopic rod 2, the angle adjusting rod 3 and the fixed hook 4, the whole device is in the shape of a straight rod, facilitating operation, at the same time, the angle adjusting rod 3 and the fixed hook 4 can rotate on the telescopic rod 2 to any angle, so that when the device is used, even if the user's hand does not move, the angle of the fixed hook 4 can also be changed, further improving the convenience of use, so that when the holding handle 1 needs to be adjusted in angle during operation, it is not necessary to control the holding handle 1 to move, but the angle of the fixed hook 4 can be adjusted, avoiding the injury to the patient caused by the pressure of the holding handle 1 on the wound during the adjustment of the position;

[0039] The front end of the fixed rod body 41 is provided with a mounting hole, and a camera 43 is connected in the mounting hole. The camera 43 can transmit the front picture in real time, further facilitating the operation of the user.

[0040] The connection part of the fixed rod body 41 and the fixed hook head 42 is provided with a fixed groove, and a fixed sensor 44 is connected in the fixed groove. When the fixed hook head 42 hooks the nerve, the nerve will touch the fixed sensor 44 and be sensed by the fixed sensor 44. At this time, the fixed sensor 44 will transmit the signal that the fixed hook head 42 hooks the nerve to the vibrator in the push block 10 through wireless signal, so that the push block 10 vibrates, and the user can know that the device hooks the nerve without seeing;

[0041] The surface of the angle adjusting rod 3 is provided with a folding groove 5, and a movable hook 6 is installed in the folding groove 5. The movable hook 6 can rotate in the folding groove 5, so that the movable hook 6 can be hidden in the folding groove 5 when not in use, without interfering with the operation of the fixed hook 4. The movable hook 6 can also rotate in the folding groove 5, and the movable hook 6 can rotate out of the folding groove 5 at any angle, so that the movable hook 6 and the fixed hook 4 form any included angle, so that the fixed hook 4 and the movable hook 6 can hook two nerves at different positions at the same time, and can be adjusted according to the positions of the two nerves, improving the applicability. The fixed hook 4 and the movable hook 6 can also be completely closed, so that the nerve is held between the closed loop formed by the fixed hook 4 and the movable hook 6, so that the nerve position is limited. Even if the user releases the control of the device, the target nerve will not be separated, so as to facilitate the operation. Moreover, when pulling, the nerve will not fall off;

[0042] The rear end of the movable rod body 61 is hinged to the front end of the folding groove 5 through the movable hook head 62, so that the movable rod body 61 can be completely hidden in the folding groove 5 before rotating, and can be stretched out of the folding groove 5 after rotating, and can be parallel to and above the fixed hook 4. The front end of the movable rod body 61 is connected with the movable hook head 62, so that the movable rod body 61 and the movable hook head 62 also form an "L" shape, so as to facilitate hooking the nerve. The connection part of the movable rod body 61 and the movable hook head 62 is fixed with a movable sensor 63, so that when the movable hook 6 hooks the nerve, the movable sensor 63 can also be sensed to remind the operator through the vibrator in the push block 10. The size of the movable hook head 62 is matched with the size of the gap between the two groups of fixed hook heads 42, so that the movable hook head 62 can be inserted between the two groups of fixed hook heads 42, further forming a closed loop between the movable rod body 61 and the fixed rod body 41, so as to facilitate the limiting of the hooked nerve, avoiding the nerve from being separated;

[0043] And the nerve can be clamped by fixing the pull hook 4 and the movable pull hook 6, the lower end surface of the movable rod body 61 is provided with thread holes 66 distributed linearly at equal distances, and the limiting block 68 can be inserted and fixed in the thread hole 66 through the threaded rod 67, further making the front end of the movable rod body 61 present "F" shape, so that the nerve is better limited and fixed, and the nerve is conveniently pulled by the hook, and the position of the threaded rod 67 inserted can be adjusted, so as to change the distance between the movable hook head 62 and the limiting block 68, and conveniently pull the nerves of different thicknesses;

[0044] The surface of the movable rod body 61 is provided with a slot 64, the slot 64 is connected with a pull rope 65, the front end of the pull rope 65 is connected to the inner wall of the slot 64, the inside of the rotating rod body 31 is provided with a sliding groove 32, and the sliding groove 32 is inserted with a sliding block 7, the other end of the pull rope 65 is connected to the sliding block 7, so that the sliding block 7 can pull the pull rope 65 when sliding in the sliding groove 32, and the inner wall of the sliding groove 32 at the front end of the sliding block 7 is hinged to a rotating wheel 9 through a fixed shaft 8, the pull rope 65 is fixedly connected to the sliding block 7 through the rotating wheel 9, because the torsion spring is installed in the movable hook head 62, when the sliding block 7 is pushed to the front end of the sliding groove 32, the movable rod body 61 is rotated and pulled out under the elastic force of the torsion spring in the movable hook head 62 and tightens the pull rope 65, when the movable rod body 61 needs to be retracted into the folding groove 5, the sliding block 7 is only needed to be pulled backward, so that the sliding block 7 slides to the rear end of the sliding groove 32, because the sliding block 7 pulls the pull rope 65 in the sliding process, the pull rope 65 is pulled back, further making the movable rod body 61 be pulled and rotated to be retracted into the folding groove 5, and the pulling force generated by the torsion spring in the movable hook head 62 cannot pull the sliding block 7 to slide, so that the control of the movable pull hook 6 can only be adjusted by the user operating the sliding block 7.

Claims

1. A probe-type retractor for performing functional monitoring of dissected nerves, comprising a holding handle (1), characterized in that: The inside of the holding handle (1) is inserted with a telescopic rod (2), the front end of the telescopic rod (2) is hinged with an angle adjusting rod (3), the front end of the angle adjusting rod (3) is fixedly connected with a fixed pull hook (4), the fixed pull hook (4) comprises a fixed rod body (41) connected at the front end of a rotating rod body (31), the front end of the fixed rod body (41) is connected with a fixed hook head (42), the surface of the angle adjusting rod (3) is provided with a folding groove (5), the folding groove (5) is hinged with a movable pull hook (6), the movable pull hook (6) comprises a movable rod body (61) hinged on the angle adjusting rod (3), the movable rod body (61) is hinged at the front end of the folding groove (5) through a movable hook head (62) at the rear end, the surface of the movable rod body (61) is provided with a slot (64), the slot (64) is connected with a pull rope (65), the front end of the pull rope (65) is connected on the inner wall of the slot (64), the inside of the rotating rod body (31) is provided with a sliding groove (32), the sliding groove (32) is inserted with a sliding block (7), the inner wall of the sliding groove (32) at the front end of the sliding block (7) is hinged with a rotating wheel (9) through a fixed shaft (8), the other end of the pull rope (65) is fixedly connected on the sliding block (7) through the rotating wheel (9), the movable hook head (62) at the rear end of the movable rod body (61) is installed with a torsion spring, the pulling force generated by the torsion spring cannot pull the sliding block (7) to slide; The front end of the movable rod body (61) is also connected with a movable hook head (62), the movable rod body (61) and the movable hook head (62) at the front end are in "L" shape, which is used for hooking the nerve.

2. The probe-type retractor for dissecting a nerve to perform functional monitoring according to claim 1, wherein: The front end of the fixed rod body (41) is provided with a mounting hole and a camera (43) is connected in the mounting hole.

3. The probe-type retractor for dissecting a nerve to implement function monitoring according to claim 1, wherein: The fixed hook head (42) is provided as two groups which are symmetrically distributed on the fixed rod body (41).

4. The probe-type retractor for use in monitoring the function of dissected nerves according to claim 1, wherein: The connecting part of the fixed rod body (41) and the fixed hook head (42) is provided with a fixed groove and a fixed sensor (44) is connected in the fixed groove, the fixed sensor (44) and the vibrator installed in the push block (10) are signal connected.

5. The probe-type retractor for use in monitoring the function of dissected nerves according to claim 1, wherein: The size of the movable pull hook (6) and the size of the folding groove (5) are matched.

6. The probe-type retractor for use in monitoring the function of dissected nerves according to claim 1, wherein: The connecting part of the movable rod body (61) and the movable hook head (62) at the front end is fixedly connected with a movable sensor (63), the movable sensor (63) and the vibrator installed in the push block (10) are signal connected.

7. The probe-type retractor for use in monitoring the function of dissected nerves according to claim 1, wherein: The surface of the lower end of the movable rod body (61) is provided with thread holes (66) which are linearly and equidistantly distributed, a limiting block (68) is inserted in the thread hole (66), the surface of the limiting block (68) is connected with a threaded rod (67).

8. The probe-type retractor for use in monitoring the function of dissected nerves according to claim 1, wherein: The size of the movable hook head (62) at the front end of the movable rod body (61) and the size of the gap between the two groups of fixed hook heads (42) are matched.

9. The probe-type retractor for use in monitoring the function of dissected nerves according to claim 1, wherein: The surface of the holding handle (1) is provided with a sliding groove, the rear end of the telescopic rod (2) is connected with a push block (10), the push block (10) is inserted into the sliding groove on the surface of the holding handle (1), the surface of the telescopic rod (2) is provided with a scale (29), and the scale (29) is located between the sliding grooves on the surface of the holding handle (1).

10. The probe-type retractor for use in monitoring the function of dissected nerves according to claim 1, wherein: The front end of the telescopic rod (2) is provided with a hinged groove, the rear end of the rotating rod body (31) is provided with a protruding block (33), the protruding block (33) and the hinged groove at the front end of the telescopic rod (2) are matched in size, the inside of the protruding block (33) is provided with a circular hole, and the inner wall of the circular hole is provided with a toothed groove, the front end of the telescopic rod (2) is internally provided with a motor (21), the output shaft of the motor (21) and the central shaft (24) internally provided with a speed reducer (22) are in transmission connection, the hinged groove at the front end of the telescopic rod (2) is inserted with the central shaft (24), the surface of the central shaft (24) is respectively connected with a turbine (25) and a central gear (26), the turbine (25) and a worm (23) are in transmission connection, the central gear (26) is located in the toothed circular hole in the protruding block (33), four groups of connecting shafts (27) are connected on the inner wall of the hinged groove at the front end of the telescopic rod (2), the four groups of connecting shafts (27) are circumferentially distributed on the outer side of the central shaft (24), each group of connecting shafts (27) is hingedly connected with a connecting gear (28), and the four groups of connecting gears (28) are located in the toothed circular hole in the protruding block (33). The central gear (26) and the four groups of connecting gears (28) are in meshing connection, and the four groups of connecting gears (28) are in meshing connection with the toothed groove on the inner wall of the protruding block (33).

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