CN115444465A

CN115444465A - Adjustable uterine curet

Info

Publication number: CN115444465A
Application number: CN202211212569.5A
Authority: CN
Inventors: 张文娟; 刘朝朝; 刘曼曼; 孔平平; 胡继君; 张文
Original assignee: Zhengzhou University Third Affiliated Hospital Henan Maternity and Child Health Care Hospital
Current assignee: Zhengzhou University Third Affiliated Hospital Henan Maternity and Child Health Care Hospital
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2022-12-09

Abstract

The invention relates to an adjustable uterine curet, which comprises a curet head, a handle and a curet rod, wherein the curet head is connected with the curet head; the handle open end rotates and is connected with the go-between, scrape the spoon pole and include sleeve pipe, regulating part and driving piece, the regulating part includes rotary drum and connecting block, the rotary drum rotates to be connected at the intraductal wall left end of cover, the connecting block is for being located the interior, protruding spherical segment towards the right of rotary drum left end opening, the spoon head is scraped in the connection of connecting block left surface, the driving piece includes driving band, movable rod and bull stick. The invention provides an adjustable uterine curet, which aims to solve the problems that after a curet head of the curet enters a uterus, the angle of the curet head is difficult to adjust, the angle adjusting amplitude of the curet head cannot be controlled, and the curet head is difficult to fit with the inner wall of the uterus.

Description

Adjustable uterine curet

Technical Field

The invention relates to the technical field of medical instruments, in particular to an adjustable uterine curet.

Background

When some gynecological diseases are examined or treated, cervical tubes, endometrial cells and tissues are required to be collected for pathological analysis, and the uterine curet is a medical instrument commonly used for collecting uterine cells or tissues and can be used for collecting uterine cell tissues in multiple points. And the curet can also be used in the induced abortion operation, when the induced abortion is carried out, embryos are generally sucked out by sucking the uterus, then decidua tissues are scraped by the curet, the curet is a rod-shaped structure consisting of a handle, a curet rod and a curet head, but the curet head of the curet used at present is fixed on the curet rod, and after the curet head of the curet enters the uterus, the angle is difficult to adjust, and further the curet is difficult to fit with the inner wall of the uterus, so that the using effect of the curet is poor.

A uterus curette for gynecological operation with the authorization publication number of CN 213345880U drives a push rod to rotate through rotating a regulating block so as to drive a pushing column to slide forwards along a curette neck, the pushing column slides forwards to drive a curette head to move forwards to be far away from the curette neck, meanwhile, a pressing column on a pressing mechanism is pressed by a strong pressure spring to move downwards to press the curette head to rotate anticlockwise downwards around the pushing column so as to increase the angle of the curette head, and the regulating block is rotated reversely to reduce the angle of the curette head. But the angle of adjustment of the device curettage spoon head is less, and application range is narrow, and the size of the angle modulation range of curettage spoon head is uncontrollable to need rotate the regulation that the curettage spoon neck just can carry out the multi-angle, but curettage spoon neck is at the pivoted in-process, and easy and cervical wall production friction causes the patient to produce uncomfortable sense, can cause the cervical wall damage even.

Disclosure of Invention

The invention provides an adjustable uterine curet, which aims to solve the problems that after a curet head of the curet enters a uterus, the angle of the curet head is difficult to adjust, the angle adjusting amplitude of the curet head cannot be controlled, and the curet head is difficult to fit with the inner wall of the uterus.

In order to solve the problems, the technical scheme of the invention is as follows:

an adjustable uterine curet comprises a curet head, a handle and a curet rod;

the handle open end rotates and is connected with the go-between, scrape the spoon pole and include sleeve pipe, regulating part and driving piece, sleeve pipe right-hand member connection go-between, the regulating part includes rotary drum and connecting block, the rotary drum rotates and connects at intraductal wall left end of cover, the spherical segment body that the connecting block is towards the right for being located rotary drum left end opening, the arch, connecting block left side connection scrapes the spoon head, and the connecting block front and back end all rotates and connects the rotary drum, is provided with first tooth on the spherical face of connecting block, the driving piece includes driving band, movable rod and bull stick, the both ends of driving band run through the curb plate upper and lower part of rotary drum right-hand member respectively, stretch into the driving band that forms the U-shaped structure in the sleeve pipe, are provided with second tooth on the lateral surface of driving band, are located the meshing of second tooth and first tooth on the driving band in the rotary drum, and the both ends of driving band are connected with relative movable rod from top to bottom, two the movable rod right side all passes the go-between the go-between groove and the rotary rod, the rotary bar is connected with the front tooth and the rotary bar, the rotary handle front groove and the rotary bar are connected with the rotary bar.

Furthermore, the left side surface of the connecting block is detachably connected with the curette head.

Furthermore, the movable rods are semi-cylindrical rod bodies, and the opposite side surfaces of the two movable rods are straight surfaces of the movable rods and are in sliding contact with the straight surfaces of the movable rods.

Furthermore, the opposite side surfaces of the two movable rods are contacted to form a cylinder with the diameter matched with the inner diameter of the sleeve, and each movable rod is in a horizontal sliding state along the guide rod inside.

Further, interval between activity pole right-hand member and the handle blind end medial surface equals with the interval between activity pole left end and the rotary drum, and interval between activity pole right-hand member and the handle blind end medial surface is greater than the arc length of a plurality of first tooth root place pitch arcs on the connecting block, the distance of both ends to the rotary drum equals about the recess, and the distance of recess left end or right-hand member to the rotary drum equals the interval between activity pole right-hand member and the handle blind end medial surface.

Furthermore, a threaded rod with the end part tightly propping against the peripheral wall of the handle is connected to the rotating plate through threads.

Furthermore, the handle is also provided with a rotating part for adjusting the axial rotation of the curette head.

Further, the rotation piece includes regulating plate, horizontal pole and gag lever post, the regulating plate is the plectane body that sets up in the handle blind end outside for the coaxial, and the horizontal pole left end runs through regulating plate centre of a circle fixed connection handle, and the right-hand member is connected with the baffle, the regulating plate is the horizontal slip state along the horizontal pole, has the compression spring of cover outside the horizontal pole between regulating plate and the baffle, the equal fixed connection gag lever post of lower extreme on the regulating plate left surface, and the free end of the gag lever post on regulating plate upper portion runs through handle perisporium upper end, the free end of the gag lever post of lower part from the dextrad left side and runs through handle perisporium lower extreme from the dextrad left side, and the free ends of two upper and lower gag lever posts all are the sliding state in the handle.

Furthermore, the compression spring is in a semi-compression state, the free end of each limiting rod tightly pushes the right side face of the connecting ring, and a space is reserved between the left side face of the adjusting plate and the outer side face of the closed end of the handle.

Furthermore, a scale is arranged at the left end of the outer wall of the handle along the circumferential direction of the handle, the scale is composed of 0-359-degree scale marks, the numerical value between every two adjacent scale marks is 1 degree, an arrow is arranged on the right side face of the connecting ring, and the arrow points to the scale mark with the initial numerical value of 0 degree of the scale.

Through the technical scheme, the invention has the beneficial effects that:

1. when the curette head enters a patient body in a horizontal state, the adjusting part and the driving part control the upward or downward inclination angle of the curette head, so that the curette head is matched with the uterine inner walls on the upper side and the lower side of the curette head.

2. The curet head can axially rotate through the rotating part, so that the curet head can carry out multi-point collection on decidua tissues on the inner wall of the uterus at different positions or uterine cell tissues, and when the curet head rotates, the sleeve cannot rotate, and the discomfort of a patient cannot be caused.

3. According to the invention, the axial rotation angle of the curette head is observed according to the dial gauge arranged outside the handle, and the axial rotation angle of the curette head is accurately controlled.

4. The left side surface of the connecting block is detachably connected with the curette head, different types of curette heads can be replaced, and the curette heads of different types are suitable for patients with different disease conditions.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a cross-sectional view taken at B-B of FIG. 2;

FIG. 5 is a schematic structural view of the drum of the present invention;

FIG. 6 is a schematic view (enlarged) of the structure of the movable bar, guide bar and drive belt connection of the upper part of the present invention;

FIG. 7 is a schematic view (enlarged) of the construction of the connector block of the present invention;

FIG. 8 is a schematic view of the connection structure of the adjusting plate and the limiting rod of the present invention.

The reference numbers in the drawings are as follows: 1 is the curette head, 2 is the screw hole, 3 is the sleeve pipe, 4 is the go-between, 5 is the arrow point, 6 is the graduation apparatus, 7 is the handle, 8 is the commentaries on classics board, 9 is the regulating plate, 10 is the horizontal pole, 11 is the baffle, 12 is compression spring, 13 is the threaded rod, 14 is the guide bar, 15 is the movable rod, 16 is the double-screw bolt, 17 is the rotary drum, 18 is the second tooth, 19 is the gear, 20 is the gag lever post, 21 is the recess, 22 is the third tooth, 23 is the rotary rod, 24 is the driving band, 25 is the through hole, 26 is first tooth, 27 is the connecting block, 28 is the pivot, 29 is the circular port.

Detailed Description

The invention is further described with reference to the following figures and detailed description:

as shown in fig. 1-8, an adjustable uterine curet comprises a curet head 1, a handle 7 and a curet rod;

the handle 7 is a cylinder with an opening at the left end, the opening end of the handle 7 is coaxially and rotatably connected with a connecting ring 4, the connecting ring 4 is a circular ring-shaped plate body with an outer diameter larger than that of the handle 7 and an inner diameter smaller than that of the handle 7, the curette rod comprises a sleeve 3, an adjusting part and a driving part, the sleeve 3 is a circular tube with two ends open, an outer diameter smaller than that of the connecting ring 4 and an inner diameter equal to that of the connecting ring 4, the intersection of the left end of the peripheral wall of the sleeve 3 and the left end surface of the sleeve 3 is in circular arc transition, the right end of the sleeve 3 is fixedly connected with the connecting ring 4, the adjusting part comprises a rotary drum 17 and a connecting block 27, the rotary drum 17 is a cylinder with an opening at the left end, the rotary drum 17 is positioned in the sleeve, the outer wall of the rotary drum 17 is rotatably connected at the left end of the inner wall of the sleeve 3, the left end of the rotary drum 17 is parallel and level with the left end of the sleeve 3, the connecting block 27 is a spherical notch body positioned in the opening at the left end of the rotary drum 17 and protrudes to the right, the left side surface of the connecting block 27 is a straight surface which is parallel and level with the left end of the rotary drum 17, the left side surface of the connecting block 27 is connected with the curette head 1, the front end and the rear end of the connecting block 27 are both connected with the inner wall of the rotary drum 17 through the rotary shaft 28 in a rotating manner, first teeth 26 which are arranged on the same arc line are arranged on the spherical surface of the connecting block 27 at intervals from top to bottom, the diameter of a circle where the outer ends of the first teeth 26 are located corresponds to the inner diameter of the rotary drum, the driving piece comprises a driving belt 24, a movable rod 15 and a rotary rod 23, the driving belt 24 is a long strip-shaped belt body made of rubber material, two ends of the driving belt 24 respectively penetrate through the upper part and the lower part of the side plate at the right end of the rotary drum 17 and extend into the sleeve 3 to form a U-shaped driving belt 24, the driving belt 24 faces the inner wall of the sleeve 3 and the side surface of the connecting block 27 are outer side surfaces, second teeth 18 are arranged on the outer side surfaces of the driving belt 24 at intervals, the second teeth 18 and the first teeth 26 on the driving belt 24 positioned in the rotary drum 17 are engaged, the upper and lower parts of the side plate at the right end of the rotary drum 17 are provided with through holes 25 through which the driving belt 24 and the second teeth 18 pass together, the left end of the bottom surface of the through hole 25 at the upper part of the side plate at the right end of the rotary drum 17 is in circular arc transition, the left end of the top surface of the through hole 25 at the lower part is in circular arc transition, two ends of the driving belt 24 are respectively and fixedly connected with movable rods 15 which are opposite to each other up and down, the right parts of the two movable rods 15 both pass through the inner ring of the connecting ring 4 and are positioned in the handle 7, a guide rod 14 is respectively and penetratingly arranged in each movable rod 15, the guide rod 14 is a square rod body, the left end of the guide rod 14 is fixedly connected to the outer side surface at the right end of the rotary drum 17, and the right end is fixedly connected to the inner side surface of the closed end of the handle 7, two 15 opposite flank right parts of movable rod all are equipped with the recess 21 that the opening is relative, and recess 21 runs through the n type groove of the front and back end of place movable rod 15 for the front and back end, every all be provided with third tooth 22 along recess 21 length direction interval on the inner bottom of recess 21, bull stick 23 is the round bar body, 23 rear end rotation connection handle 7 back lateral wall, front end pass in proper order between two recess 21 middle parts and handle 7 preceding lateral wall, overlap on the bull stick 23 between two recesses 21 and establish the gear 19 that is fixed with and the third tooth 22 meshing of downside on the bull stick, 23 front end fixedly connected with of bull stick is located the outer commentaries on classics board 8 of handle 7, the commentaries on classics board 8 is the coaxial disc body with bull stick 23.

The left side surface of the connecting block 27 is detachably connected with a scraper head 1, the middle part of the left side surface of the connecting block 27 is provided with a threaded hole 2 with an opening facing to the left, and the scraper head 1 is connected with the connecting block 27 through a stud 16 connected in the threaded hole 2.

The inner side surface of a driving belt 24 in the drum 17 is in sliding contact with the inner side surface of the right end of the drum 17 between the two through holes 25.

The movable rod 15 is a semi-cylindrical rod body, two opposite side surfaces of the movable rod 15 are straight surfaces of the movable rod 15 and are in sliding contact, two opposite side surfaces of the movable rod 15 are in contact to form a cylinder with the diameter matched with the inner diameter of the sleeve 3, and each movable rod 15 is in a horizontal sliding state along the guide rod 14 inside.

Every there is the interval between 15 right-hand members of movable rod and the 7 blind end medial surfaces of handle, left end and the rotary drum 17, interval between 15 right-hand members of movable rod and the 7 blind end medial surfaces of handle equals with the interval between 15 left ends of movable rod and the rotary drum 17, and interval between 15 right-hand members of movable rod and the 7 blind end medial surfaces of handle is greater than the arc length of the pitch arc at 26 tooth roots of a plurality of first teeth on connecting block 27, both ends equal to the distance of bull stick 23 about recess 21, and recess 21 left end or right-hand member equal to the interval between 15 right-hand members of movable rod and the 7 blind end medial surfaces of handle to the distance of bull stick 23.

The rotating plate 8 is in threaded connection with a threaded rod 13 with the end part tightly abutting against the peripheral wall of the handle 7, and the threaded rod 13 is used for limiting the rotating plate 8.

The handle 7 is also provided with a rotating part for adjusting the axial rotation of the curette head 1.

The rotation piece includes regulating plate 9, horizontal pole 10 and gag lever post 20, regulating plate 9 is the coaxial plectane body that sets up in the handle 7 blind end outside, and the diameter of regulating plate 9 is greater than handle 7 external diameter, and horizontal pole 10 is the round plectane body, and horizontal pole 10 left end runs through regulating plate 9 centre of a circle fixed connection handle 7, and the right-hand member is connected with baffle 11, has on the regulating plate 9 circular port 29 with horizontal pole 10 sliding contact, regulating plate 9 is the horizontal slip state along the horizontal pole, has the cover compression spring 12 outside horizontal pole 10 between regulating plate 9 and the baffle 11, and the equal fixed connection gag lever post 20 of lower extreme on the regulating plate 9 left surface, and the free end of the gag lever post 20 on regulating plate 9 upper portion runs through handle 7 perisporium lower extreme from the right left side to the free end of the gag lever post 20 of handle 7 perisporium upper end, lower part 20 all is the sliding state in handle 7, gag lever post 20 is the round plectane body, be equipped with the through-hole that supplies gag lever post 20 to pass on handle 7, and with gag lever post 20 sliding contact.

Compression spring 12 is half compression state, and every gag lever post free end all pushes up 4 right flanks of go-between, there is the interval regulating plate 9 left flank and 7 blind end lateral surfaces of handle, and the gag lever post 20 is pushed up and is restricted the handle and rotates behind the go-between.

The left end of the outer wall of the handle 7 is provided with a scale 6 along the circumferential direction of the handle 7, the scale 6 is composed of 0-359-degree scale marks, the numerical value between every two adjacent scale marks is 1 degree, an arrow 5 is arranged on the right side face of the connecting ring 4, and the arrow 5 points to the scale mark with the initial numerical value of 0 degree of the scale 6.

When the connecting block 27 rotates clockwise by taking the central axis of the rotating shaft 28 as a rotating shaft until the scraper head 1 contacts the upper end of the peripheral wall of the rotating drum 17, the connecting block 27 rotates to a limit state, and the included angle between the central axis of the stud 16 and the central axis of the rotating drum 17 is 80 degrees, so that the scraper head 1 is driven by the connecting block 27 to tilt upwards within the range of 0-80 degrees.

When the curette head 1 enters the uterus of a patient in a horizontal state, the curette head 1 reaches a part to be scraped on the inner wall of the uterus of the patient, the threaded rod 13 is unscrewed, the rotating plate 8 is rotated clockwise, the rotating plate 8 drives the rotating rod 23 to rotate, the gear 19 rotates along with the rotating rod 23, the gear 19 drives the movable rod 15 on the upper side to move rightwards, the movable rod 15 on the lower side to move leftwards, the two movable rods 15 drive the two ends of the driving belt 24 to move in the right-left and right-left directions, the driving belt 24 drives the connecting block 27 to rotate anticlockwise by taking the central axis of the rotating shaft 28 as the rotating shaft, the connecting block 27 drives the curette head 1 to incline downwards, the upper end of the gear 19 drives the movable rod 15 on the upper side to move leftwards, the movable rod 15 on the lower side to move rightwards, the two movable rods 15 drive the two ends of the driving belt 24 to move in the left-right and left-right directions, the driving belt 24 drives the connecting block 27 to rotate by taking the central axis of the rotating shaft 28 as the rotating shaft, the connecting block 27 drives the curette head 1 to incline upwards, the curette head 1 to finish the angle adjustment, so that the curette head can be adjusted according to the wide application range of the application, and the application of the curette head can be adjusted, and the application range of the curette head can be improved in which is enlarged;

when the curette head 1 needs to scrape decidua tissues on the inner wall of uterus at different positions or carry out multi-point collection on uterine cell tissues, one hand grasps the connecting ring 4 to keep the connecting ring stable, the other hand pulls the adjusting plate 9 rightwards, the adjusting plate 9 drives the limiting rod to move rightwards, the free end of the limiting rod does not tightly push the connecting ring any more, the limiting rod relieves the limit on the handle, one hand pulling the adjusting plate 9 rotates the adjusting plate 9, the handle 7 can axially rotate along with the adjusting plate 9, because one end of the guide rod 14 is connected with the handle 7, the other end of the guide rod is connected with the rotary drum 17, the rotary drum 17 rotates to connect the sleeve pipe 3, when the handle 7 rotates, the rotary drum 17 rotates along with the handle 7, the rotary drum 17 drives the curette head 1 on the connecting block 27 to axially rotate, the axial rotation angle of the curette head 1 is accurately controlled according to the dial gauge 6 arranged outside the handle 7, the efficiency is improved, the collection or human stream time is shortened, and because the sleeve pipe 3 is fixed on the connecting ring, when the curette head 1 rotates, the curette head 3 can not rotate, and discomfort of a patient can not be caused.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various equivalent or equivalent modifications or substitutions may be made within the scope of the present invention without departing from the spirit or scope of the invention.

Claims

1. An adjustable uterine curet, which comprises a curet head (1), and is characterized by also comprising a handle (7) and a curet rod;

the handle (7) open end is connected with go-between (4) in a rotating manner, the curette rod includes sleeve pipe (3), adjusting part and driving piece, sleeve pipe (3) right-hand member connection go-between (4), adjusting part includes rotary drum (17) and connecting block (27), rotary drum (17) rotate to be connected in sleeve pipe (3) inner wall left end, connecting block (27) are for being located the spherical segment body that rotary drum (17) left end opening, the arch is towards the right, curette head (1) is connected to connecting block (27) left side, connecting block (27) front and back end all rotates and connects rotary drum (17), be provided with first tooth (26) on the spherical surface of connecting block (27), the driving piece includes driving band (24), movable rod (15) and bull stick (23), the both ends of driving band (24) run through the upper and lower part of the curb plate of rotary drum (17) right-hand member respectively, stretch into sleeve pipe (3) and form driving band (24) of U-shaped structure, be provided with second tooth (18) on the lateral surface of driving band (24), be located the first tooth (18) on rotary drum (24) and first tooth (24) of driving band (24) in (24), two relative movable rod (15) pass through the upper and the movable rod (24) respectively, the right side the two movable rod (15) that the movable rod (15) are connected with the driving band (15) respectively, the movable rod (15) that the movable rod (24) is connected with the upper and lower part is connected with the movable rod (24) is connected with the upper and lower part, and be located handle (7), all wear to be equipped with guide bar (14) in every movable rod (15), guide bar (14) left end is connected on the blind end medial surface that handle (7) was connected to rotary drum (17) right-hand member lateral surface, right-hand member, two the relative side right part of movable rod (15) all is equipped with recess (21), every be provided with third tooth (22) on the inner bottom of recess (21), rotary rod (23) rear end is rotated and is connected handle (7) rear side wall, front end and pass in proper order between two recesses (21) and handle (7) front side wall, and rotary rod (23) between two recesses (21) are gone up the cover and are established and are fixed with gear (19) with third tooth (22) meshing of the upper and lower side of rotary rod, rotary rod (23) front end is connected with commentaries on classics board (8).

2. An adjustable uterine curette according to claim 1, wherein the left side of the connecting block (27) is detachably connected to the curette head (1).

3. An adjustable uterine curet according to claim 1, wherein said movable bar (15) is a semi-cylindrical bar body, and two opposite sides of said movable bar (15) are straight sides of the movable bar (15) and are in sliding contact.

4. An adjustable uterine curette according to claim 3, wherein two of said movable bars (15) are in contact on opposite sides to form a cylinder having a diameter corresponding to the inner diameter of the sleeve (3), each of said movable bars (15) being in a horizontally sliding position along the inner guide bar (14).

5. The adjustable uterine curet according to claim 1, wherein the distance between the right end of the movable rod (15) and the inner side surface of the closed end of the handle (7) is equal to the distance between the left end of the movable rod (15) and the rotary drum (17), the distance between the right end of the movable rod (15) and the inner side surface of the closed end of the handle (7) is greater than the arc length of the arc where the tooth roots of the first teeth (26) are located on the connecting block (27), the distance from the left end or the right end of the groove (21) to the rotary rod (23) is equal, and the distance from the left end or the right end of the groove (21) to the rotary rod (23) is equal to the distance between the right end of the movable rod (15) and the inner side surface of the closed end of the handle (7).

6. An adjustable uterine curette according to claim 1, wherein the rotatable plate (8) is threadedly connected to a threaded shaft (13) having an end portion abutting against the peripheral wall of the handle (7).

7. An adjustable uterine curet according to claim 1, wherein the handle (7) is further provided with a rotary member for adjusting the axial rotation of the curet head (1).

8. The adjustable uterine curet according to claim 7, wherein the rotating member comprises an adjusting plate (9), a cross rod (10) and a limiting rod (20), the adjusting plate (9) is a circular plate coaxially arranged outside the closed end of the handle (7), the left end of the cross rod (10) penetrates through the circle center of the adjusting plate (9) and is fixedly connected with the handle (7), the right end of the cross rod is connected with a baffle (11), the adjusting plate (9) is in a horizontal sliding state along the cross rod, a compression spring (12) sleeved outside the cross rod (10) is arranged between the adjusting plate (9) and the baffle (11), the upper end and the lower end of the left side surface of the adjusting plate (9) are fixedly connected with the limiting rod (20), the free end of the limiting rod (20) at the upper part of the adjusting plate (9) penetrates through the upper end of the peripheral wall of the handle (7) from right to left, the free end of the limiting rod (20) at the lower part penetrates through the lower end of the peripheral wall of the handle (7) from right to left, and the free ends of the upper and lower limiting rods (20) are in a sliding state in the handle (7).

9. An adjustable uterine curet according to claim 8, wherein the compression spring (12) is in a semi-compressed state, the free end of each limiting rod abuts against the right side of the connecting ring (4), and the left side of the adjusting plate (9) is spaced from the outer side of the closed end of the handle (7).

10. The adjustable uterine curet according to claim 8, wherein a scale (6) is arranged at the left end of the outer wall of the handle (7) along the circumferential direction of the handle (7), the scale (6) is composed of 0-359-degree scale lines, the numerical value between every two adjacent scale lines is 1 degree, an arrow (5) is arranged on the right side surface of the connecting ring (4), and the arrow (5) points to the scale line of 0 degree of the initial numerical value of the scale (6).