阅读说明：本技术 一种股骨克氏针定位调整装置 (Femoral Kirschner wire positioning and adjusting device ) 是由 官建中 徐陈 吴敏 王照东 刘亚军 于 2021-10-13 设计创作，主要内容包括：一种股骨克氏针定位调整装置,其包括蜂窝导向器,以及和蜂窝导向器匹配使用的套筒；在蜂窝导向器内部设置有供克氏针伸入的定位管；在蜂窝导向器内部的第一端设置有供克氏针伸入的活动管,活动管与定位管之间通过连接结构连接；活动管的外侧设置能够调节活动管位置的调节结构,和在活动管发生移动时能够保证其稳定性的固定结构；在蜂窝导向器和套筒的外侧设置有容纳调节结构和固定结构并供其移动的贯穿槽,设置在蜂窝导向器和套筒的贯穿槽尺寸和位置相一致；通过此种在蜂窝导向器内部设置可移动的活动管的设置,从根本改变原有蜂窝导向器的使用原理,有效实现当克氏针定位位置不理想时,对克氏针的位置进行微调整的功能。(A femoral Kirschner wire positioning and adjusting device comprises a honeycomb guide and a sleeve matched with the honeycomb guide for use; a positioning tube for the Kirschner wire to extend into is arranged in the honeycomb guider; a movable tube for the Kirschner wire to extend into is arranged at the first end in the honeycomb guider, and the movable tube is connected with the positioning tube through a connecting structure; the outer side of the movable pipe is provided with an adjusting structure capable of adjusting the position of the movable pipe and a fixed structure capable of ensuring the stability of the movable pipe when the movable pipe moves; the outer sides of the honeycomb guider and the sleeve are provided with through grooves for accommodating the adjusting structure and the fixing structure and moving the adjusting structure and the fixing structure, and the sizes and the positions of the through grooves arranged on the honeycomb guider and the sleeve are consistent; through the arrangement of the movable tube arranged in the honeycomb guider, the use principle of the original honeycomb guider is fundamentally changed, and the function of finely adjusting the position of the Kirschner wire when the positioning position of the Kirschner wire is not ideal is effectively realized.)

1. A femoral Kirschner wire positioning and adjusting device comprises a honeycomb guide and a sleeve matched with the honeycomb guide for use; it is characterized in that a positioning tube for a Kirschner wire to extend into is arranged in the honeycomb guider; a movable tube for the Kirschner wire to extend into is arranged at the first end in the honeycomb guider, and the movable tube is connected with the positioning tube through a connecting structure; the outer side of the movable pipe is provided with an adjusting structure capable of adjusting the position of the movable pipe and a fixed structure capable of ensuring the stability of the movable pipe when the movable pipe moves; and through grooves for accommodating the adjusting structure and the fixing structure and allowing the adjusting structure and the fixing structure to move are arranged on the outer sides of the honeycomb guide and the sleeve, and the size and the position of the through grooves arranged on the honeycomb guide and the sleeve are consistent.

2. The femoral Kirschner wire positioning adjustment device of claim 1, wherein the honeycomb guide is provided as a hollow structure, and the positioning tube and the inner side wall of the honeycomb guide are connected by a connecting rod.

3. The femoral k-wire positioning adjustment device of claim 1, wherein the through-slots do not completely separate the honeycomb guide and the through-slots do not completely separate the sleeve.

4. The femoral Kirschner wire positioning and adjusting device of claim 1, wherein the connecting structure is a connecting band which can be sleeved outside the positioning tube and the movable tube, and the movable tube can drive the connecting band to move around when rotating around the positioning tube, but the position of the positioning tube is not changed.

5. The femoral Kirschner wire positioning and adjusting device according to claim 4, wherein length scale marks are arranged on the upper surface of the positioning tube and/or the connecting band; the length scale marks the distance from the center of the positioning tube to the center of the movable tube.

6. The femoral Kirschner wire positioning adjustment device according to claim 1, wherein the adjustment structure comprises a third connecting ring arranged on the outer side of the movable tube, a moving rod integrally connected with the third connecting ring, and a fixed block arranged in the through groove; a through hole for the moving rod to extend into and move back and forth is formed in the fixed block; arc-shaped baffles which are consistent with the shape of the through groove are arranged on the inner side wall of the sleeve, and the arc-shaped baffles are respectively arranged at the upper end and the lower end of the through groove; the distance between the bottom edge of the arc-shaped baffle plate positioned at the upper end of the through groove and the upper end edge of the arc-shaped baffle plate positioned at the lower end of the through groove is larger than the thickness of the moving rod.

7. The femoral Kirschner wire positioning adjustment device of claim 6, wherein the fixing structure comprises a first fixing member for fixing the position of the fixing block, and a second fixing member for fixing the position of the moving rod; the first fixing piece is arranged at the upper end or the lower end of the fixing block; the second fixing piece is arranged on the outer side of the fixing block and is located at the lower end or the upper end of the moving rod.

8. The femoral Kirschner wire positioning adjustment device of any of claims 1-7,

and a circular baffle plate for fixing the position of the honeycomb guider relative to the sleeve is also arranged at the first end of the honeycomb guider.

9. The femoral Kirschner wire positioning adjustment device of claim 8, wherein angle scale markings are provided on the first end of the honeycomb guide and on the upper surface of the circular baffle.

10. The femoral Kirschner wire positioning adjustment device of claim 1, wherein a handle for convenient operation is fixedly arranged at one end of the outer side of the sleeve.

Technical Field

The invention belongs to the field of medical instruments, and particularly relates to a femoral Kirschner wire positioning and adjusting device.

Background

The kirschner wire is a commonly used internal fixation material in orthopedics, is used for fixing short fractures or avulsion fractures and other fractures with low stress, and is also used for fixing temporary fracture blocks in orthopedic operations.

At present, a kirschner wire or an intramedullary nail is often required to be drilled into a bone for fixation in a clinical bone surgery operation, the positioning process of implanting the kirschner wire mainly depends on the clinical experience of an operator, and is combined with a honeycomb guider with the size consistent with that of the kirschner wire for positioning, namely, the operator inserts the kirschner wire into a round hole at one end of the honeycomb guider according to the clinical experience, and then continuously extends the kirschner wire inwards and fixes the kirschner wire. In the operation, if the main nail is not placed correctly, the correct position needs to be adjusted, and two methods are used for solving the problems: firstly, fingers and touch of an operator are used for stretching into the incision to touch the vertex of the greater trochanter to readjust the position of the guide pin, including the movement of the front and back, the inner side and the outer side; the repeated adjustment process not only increases the pain of the patient and the working intensity of medical staff, but also increases the damage to the health of the patient; secondly, the target position is searched, the kirschner wire is implanted again by utilizing the honeycomb guider, but the target position cannot be found at one time by the aid of the implanted kirschner wire, and the target position is fixed at a proper position, so that the target position still needs to be repeatedly adjusted again, and operation is complex. Moreover, each adjustment of the k-wire or intramedullary nail requires fluoroscopy, which not only increases the time for operative anesthesia and local tissue trauma, but also inevitably increases radiation exposure for the physician and the patient.

The honeycomb guide plays a very important role in adjusting the position of the k-wire or intramedullary nail, but it has the following drawbacks limiting the adjustment step: the round hole rigidity of honeycomb director one end generally comprises the first round hole that is located the center and 6 round holes around first round hole centre of a circle evenly distributed, and distance and position between the round hole all can't be adjusted, and the rigidity of round hole, can't satisfy the demand of fixing the kirschner wire between two round holes. Therefore, a positioning adjusting device capable of finely adjusting the position of the circular hole according to the condition of a patient and further ensuring fine adjustment of the position of the kirschner wire is needed to overcome the defects in the prior art.

Disclosure of Invention

In order to overcome the problems in the background art, the invention provides a femoral Kirschner wire positioning and adjusting device.

A femoral Kirschner wire positioning and adjusting device comprises a honeycomb guide and a sleeve matched with the honeycomb guide for use; a positioning tube for the Kirschner wire to extend into is arranged in the honeycomb guider; a movable tube for the Kirschner wire to extend into is arranged at the first end in the honeycomb guider, and the movable tube is connected with the positioning tube through a connecting structure; the outer side of the movable pipe is provided with an adjusting structure capable of adjusting the position of the movable pipe and a fixed structure capable of ensuring the stability of the movable pipe when the movable pipe moves; the outer sides of the honeycomb guider and the sleeve are provided with through grooves for accommodating the adjusting structure and the fixing structure and moving the adjusting structure and the fixing structure, and the sizes and the positions of the through grooves arranged on the honeycomb guider and the sleeve are consistent; through the arrangement of the movable tube arranged in the honeycomb guider, the use principle of the original honeycomb guider is fundamentally changed, and the function of finely adjusting the position of the Kirschner wire when the positioning position of the Kirschner wire is not ideal is effectively realized.

Furthermore, the honeycomb guider is of a hollow structure, and the positioning pipe is connected with the inner side wall of the honeycomb guider through a connecting rod; this kind of setting effectively guarantees the stability of registration arm in the honeycomb director.

Further, the through groove does not completely separate the honeycomb guide, and the through groove does not completely separate the sleeve; this arrangement ensures the integrity of the honeycomb guide and also of the sleeve.

Furthermore, the connecting structure is a connecting belt which can be sleeved outside the positioning pipe and the movable pipe, when the movable pipe rotates around the positioning pipe, the movable pipe can drive the connecting belt to move around the positioning pipe, but the position of the positioning pipe is not changed; the function of adjusting the position of the Kirschner wire is effectively realized by adjusting the distance between the movable tube and the positioning tube.

Further, the connecting band sets up to notch shape connecting band.

Or the connecting band comprises a first connecting ring arranged on the outer side of the positioning tube, a second connecting ring arranged on the outer side of the movable tube, and a straight connecting band used for connecting the first connecting ring and the second connecting ring; the arrangement can further ensure the stability of the positioning tube and the movable tube in the static and rotating processes.

Furthermore, length scale marks are arranged on the upper surface of the positioning pipe and/or the connecting belt; the length scale marks the distance from the center of the positioning tube to the center of the movable tube. The accurate positioning of the Kirschner wire on the distance can be realized by setting the length scale marks, and the operation is convenient.

Further, the adjusting structure comprises a third connecting ring arranged on the outer side of the movable pipe, a movable rod integrally connected with the third connecting ring, and a fixed block arranged in the through groove; a through hole for the moving rod to extend into and move back and forth is formed in the fixed block; arc-shaped baffles which are consistent with the shape of the through groove are arranged on the inner side wall of the sleeve, and the arc-shaped baffles are respectively arranged at the upper end and the lower end of the through groove; the distance between the bottom edge of the arc-shaped baffle plate positioned at the upper end of the through groove and the upper end edge of the arc-shaped baffle plate positioned at the lower end of the through groove is larger than the thickness of the moving rod. According to the position requirement of the movable pipe, the fixed block is rotated along the radian of the sleeve, the movable rod, the third connecting ring and the movable pipe are driven to rotate, and after the movable rod, the third connecting ring and the movable pipe are rotated to proper positions, the position of the fixed block is fixed by using the fixing structure; and then the relative positions of the third connecting ring, the movable pipe and the positioning pipe are controlled by moving the movable rod inwards or outwards, and after the movable rod moves to a proper position, the position of the movable rod with the fixed structure is used for fixing. The arrangement effectively realizes the function of adjusting the position of the movable tube.

Further, a finger groove which is convenient for operating and moving the fixing block is arranged on the outer side of the fixing block.

Further, the fixing structure comprises a first fixing piece for fixing the position of the fixing block and a second fixing piece for fixing the position of the movable rod; the first fixing piece is arranged at the upper end or the lower end of the fixing block; the second fixing piece is arranged on the outer side of the fixing block and is positioned at the lower end or the upper end of the movable rod; the positions of the fixed block and the movable rod can be fixed respectively through the mode, and the operation is convenient.

Furthermore, length scale marks capable of displaying the distance from the circle center of the positioning pipe to the circle center of the movable pipe are arranged on the upper surface of the moving rod.

Further, a circular baffle plate used for fixing the position of the honeycomb guider relative to the sleeve is arranged at the first end of the honeycomb guider; the arrangement of the circular baffle plate effectively prevents the honeycomb guider from falling off from the inside of the sleeve when the honeycomb guider is placed into the sleeve, and the normal matched use of the honeycomb guider and the sleeve is ensured.

Further, the outer edge of the circular baffle is provided with a petal-shaped bulge which is convenient to operate.

Furthermore, angle scale marks are arranged at the first end of the honeycomb guider and the upper surface of the circular baffle; the accurate positioning of the Kirschner wire in the aspect of the rotation angle can be realized by setting the angle scale marks, and the operation is convenient.

Furthermore, the first end of the positioning tube is also provided with angle scale marks.

Furthermore, the outer side wall of the honeycomb guider, the inner side cylinder wall of the sleeve and the second end of the sleeve are all arranged to be friction surfaces.

Furthermore, a handle convenient to operate is fixedly arranged at one end of the outer side of the sleeve.

When the positioning device is used, the honeycomb guider is placed in the sleeve, one end of the sleeve is abutted to the vertex of the greater trochanter of the femur through a minimally invasive incision, and the 1 st Kirschner wire or intramedullary nail is inserted into the positioning tube to perform initial X-ray fluoroscopy to confirm the position; and confirming whether the position of the 1 st kirschner wire is in a front-back deviation or inside-outside deviation state according to the primary perspective result, then determining the direction and distance amplitude required to be adjusted for adjusting the kirschner wire, inserting the 2 nd kirschner wire into the movable tube, confirming X-ray perspective again, taking out the 1 st guide wire and the sleeve, and keeping the 2 nd kirschner wire at the final position.

Or when the device is used, the 1 st Kirschner wire is directly inserted into the movable tube, the primary perspective result is carried out, whether the position of the 1 st Kirschner wire is in a front-back deviation state or an inner-outer deviation state or not is confirmed, then the direction and the distance amplitude which are required to be adjusted for adjusting the Kirschner wire are determined, the position of the movable tube is adjusted according to the perspective result, the position of the 1 st Kirschner wire is adjusted, the final position is confirmed by X-ray perspective again, and the position of the 1 st Kirschner wire is reserved after the confirmation.

Compared with the prior art, the technical scheme of the invention realizes the effect of adjusting the position of the Kirschner wire in the movable tube by adjusting the position of the movable tube by arranging the hollow honeycomb guider, arranging the positioning tube with a fixed position and the movable tube with a movable position in the hollow honeycomb guider; and set up the sleeve that matches and use with the honeycomb director to set up regulation structure and the fixed knot who can adjust the activity pipe position in honeycomb director and sleeve department and construct, effectively guaranteed the regulatory action and the fixed effect to the activity pipe. In addition, through set up length scale mark and angle scale mark in telescopic first end, effectively satisfy medical personnel and carry out the demand of finely tuning to the angle and the distance of activity pipe, have fine clinical effect. The 1 st positioning kirschner wire can be quickly adjusted to an ideal position through the device, the structure is simple, and the operation is convenient. The honeycomb guider can effectively overcome the defects that the positions of the positioning holes of the existing honeycomb guider are fixed, and the distance and the direction between the positioning holes cannot be adjusted.

Drawings

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

FIG. 2 is a schematic view of the honeycomb guide and sleeve of the present invention in their entirety when separated;

FIG. 3 is a partially enlarged structural view of the sleeve penetrating the slot in the present invention;

FIG. 4 is a cross-sectional view of an enlarged structure of the sleeve, the handle and the honeycomb guide (the movable tube, the adjusting structure and the fixing structure are not shown) in the present invention;

FIG. 5 is an enlarged cross-sectional view of the sleeve and honeycomb guide (showing the movable tube, the adjustment structure and the fixed structure) of the present invention;

FIG. 6 is a partially enlarged sectional view of the sleeve and the honeycomb guide (the movable tube, the adjusting structure and the fixing structure are not shown) of the present invention;

FIG. 7 is a schematic view of the construction of the honeycomb guide (movable tube, adjusting structure and fixing structure are not shown) of the present invention;

FIG. 8 is a schematic top view of the honeycomb guide (movable tube, adjustment structure and fixing structure are not shown) of the present invention;

FIG. 9 is an enlarged schematic view of the honeycomb guide (showing the movable tube, the adjusting structure and the fixing structure) of the present invention;

FIG. 10 is a schematic top view of the honeycomb guide of the present invention (showing the movable tube, the adjustment structure and the fixing structure);

FIG. 11 is a schematic structural view of a movable tube, a connecting structure, an adjusting structure and a fixing structure according to the present invention;

FIG. 12 is a cross-sectional view of the adjusting structure and the fixing structure according to the present invention;

in the figure, 1, a honeycomb guider; 11. a positioning tube; 12. a movable tube; 13. a connecting rod; 14. a connecting belt; 141. a first connecting ring; 142. a second connection ring; 143. a straight connecting band; 15. a through groove; 16. A circular baffle; 2. a sleeve; 21. a handle; 3. length scale marks; 41. a third connecting ring; 42. a travel bar; 43. a fixed block; 44. a through hole; 45. an arc-shaped baffle plate; 46. a finger groove; 47. a first fixing plate; 48. a first threaded cap; 49. a second fixing plate; 410. a second threaded cap; 5. and (5) marking angle scales.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below by specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and other advantages and effects of the present invention can be easily understood by those skilled in the art from the disclosure of the present specification. The present invention can be implemented or applied by other different specific embodiments, and the features in the following embodiments and embodiments can be combined with each other without conflict, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Example 1

Referring to fig. 1 to 12, a femoral kirschner wire positioning and adjusting device of the present embodiment includes a honeycomb guide 1, and a sleeve 2 used in cooperation with the honeycomb guide 1; a positioning tube 11 for a Kirschner wire to extend into is arranged in the honeycomb guider 1; a movable tube 12 for a Kirschner wire to extend into is arranged at the first end in the honeycomb guider 1, and the movable tube 12 is connected with the positioning tube 11 through a connecting structure; an adjusting structure capable of adjusting the position of the movable tube 12 and a fixing structure capable of ensuring the stability of the movable tube 12 when the movable tube 12 moves are arranged on the outer side of the movable tube 12; the outer sides of the honeycomb guider 1 and the sleeve 2 are provided with through grooves 15 for accommodating and moving the adjusting structure and the fixing structure, and the sizes and the positions of the through grooves 15 arranged on the honeycomb guider 1 and the sleeve 2 are consistent; through the arrangement of the movable tube 12 arranged in the honeycomb guider 1, the use principle of the original honeycomb guider 1 is fundamentally changed, and the function of fine adjustment of the position of the Kirschner wire is effectively realized when the positioning position of the Kirschner wire is not ideal.

The honeycomb guider 1 is of a hollow structure, and the positioning pipe 11 is connected with the inner side wall of the honeycomb guider 1 through a connecting rod 13; this arrangement effectively ensures the stability of the positioning tube 11 within the honeycomb guide 1. The connecting rods 13 are arranged at the second end of the honeycomb guider 1, and the number of the connecting rods 13 is at least 1; when the number of the connecting rods 13 is 2, the 2 connecting rods 13 are symmetrically arranged at two sides of the positioning tube 11; when the number of the connecting rods 13 is plural, the plural connecting rods 13 are uniformly arranged on the periphery of the positioning tube 11 around the center of the positioning tube 11.

The through groove 15 incompletely separates the honeycomb guide 1, and the through groove 15 incompletely separates the sleeve 2; this arrangement ensures the integrity of the honeycomb guide 1 and also of the sleeve 2.

The connecting structure is provided with a connecting belt 14 which can be sleeved outside the positioning pipe 11 and the movable pipe 12, when the movable pipe 12 rotates around the positioning pipe 11, the connecting belt 14 can be driven to move around, but the position of the positioning pipe 11 is not changed; the function of adjusting the position of the Kirschner wire is effectively realized by adjusting the distance between the movable tube 12 and the positioning tube 11.

Length scale marks 3 are arranged on the upper surface of the positioning tube 11 and/or the connecting band 14; the length scale markings 3 mark the distance from the centre of the positioning tube 11 to the centre of the movable tube 12. The accurate positioning of the Kirschner wire on the distance can be realized by the arrangement of the length scale marks 3, and the operation is convenient.

The adjusting structure includes a third connecting ring 41 disposed outside the movable tube 12, a moving rod 42 integrally connected to the third connecting ring 41, and a fixed block 43 disposed in the through groove 15; a through hole 44 for the moving rod 42 to extend into and move back and forth is arranged in the fixed block 43; arc-shaped baffles 45 with the same shape as the through groove 15 are arranged on the inner side wall of the sleeve 2, and the arc-shaped baffles 45 are respectively arranged at the upper end and the lower end of the through groove 15; the distance between the bottom edge of the arc-shaped baffle 45 at the upper end of the through slot 15 and the upper edge of the arc-shaped baffle 45 at the lower end of the through slot 15 is greater than the thickness of the travel bar 42. In this way, according to the position requirement of the movable tube 12, the fixed block 43 is rotated along the radian of the sleeve 2, the movable rod 42, the third connecting ring 41 and the movable tube 12 are driven to rotate, and after the movable rod rotates to a proper position, the position of the fixed block 43 is fixed by using a fixing structure; the relative positions of the third connecting ring 41 and the movable tube 12 and the positioning tube 11 are controlled by moving the moving rod 42 inwards or outwards, and after the moving rod is moved to a proper position, the position of the moving rod 42 with a fixed structure is used for fixing. This arrangement effectively performs the function of adjusting the position of the movable tube 12. A finger groove 46 for facilitating the operation of moving the fixing block 43 is provided on the outer side of the fixing block 43.

The fixing structure comprises a first fixing piece for fixing the position of the fixing block 43 and a second fixing piece for fixing the position of the movable rod 42; the first fixing member is disposed at the upper end or the lower end of the fixing block 43; the second fixing member is disposed at the outer side of the fixing block 43 and is located at the lower end or the upper end of the moving rod 42; the positions of the fixed block 43 and the movable rod 42 can be respectively fixed by the mode, and the operation is convenient.

The first fixing member includes a first fixing plate 47 provided at an upper end or a lower end of the fixing block 43, and a first screw cap 48 used in cooperation with the first fixing plate 47; through screw holes are provided on the inner and outer sides of the first fixing plate 47; by screwing the first threaded cap 48 into the through threaded hole and attaching to the outer side of the sleeve 2 in this way, the fixing block 43 and the sleeve 2 are fixed together, and the position of the fixing block 43 is fixed. The thread fixing mode is convenient to operate and good in stability.

The second fixing member includes a second fixing plate 49 disposed outside the fixing block 43, and a second screw cap 410 used in cooperation with the second fixing plate 49; through screw holes are provided on the upper and lower sides of second fixing plate 49; by screwing the second screw cap 410 into the through screw hole and tightly adhering to the upper or lower side of the moving rod 42 in this way, the fixing block 43 and the moving rod 42 are fixed together, and the position of the moving rod 42 is fixed. The thread fixing mode is convenient to operate and good in stability.

A circular baffle 16 for fixing the position of the honeycomb guider 1 relative to the sleeve 2 is also arranged at the first end of the honeycomb guider 1; the arrangement of the circular baffle 16 effectively prevents the honeycomb guider 1 from falling from the sleeve 2 when being placed into the sleeve 2, and ensures the normal matching use of the honeycomb guider 1 and the sleeve 2. The outer edge of the circular baffle 16 is provided with a petaloid projection for convenient handling.

The first end of the honeycomb guider 1 and the upper surface of the circular baffle 16 are provided with angle scale marks 5; the accurate positioning of the Kirschner wire in the aspect of the rotation angle can be realized by arranging the angle scale marks 5, and the operation is convenient. The outer side wall of the honeycomb guider 1, the inner side wall of the sleeve 2 and the second end of the sleeve 2 are all arranged as friction surfaces. A handle 21 convenient for operation is fixedly arranged at one end of the outer side of the sleeve 2.

Example 2

Referring to fig. 1 to 12, the present embodiment adds the following technical features on the basis of embodiment 1: the connecting band 14 is provided as a slotted connecting band 14.

Other technical features in this embodiment are the same as those in embodiment 1, and are not described herein again.

Example 3

Referring to fig. 9 to 11, in this embodiment, the technical feature "connecting band 14 added in embodiment 2 is configured as a slot-shaped connecting band 14. "replace with the following technical characteristics:

the connection band 14 includes a first connection ring 141 disposed outside the positioning tube 11, a second connection ring 142 disposed outside the movable tube 12, and a straight connection band 143 for connecting the first connection ring 141 and the second connection ring 142; this arrangement further ensures the stability of the positioning tube 11 and the movable tube 12 both in rest and in rotation.

Other technical features in this embodiment are the same as those in embodiment 1, and are not described herein again.

Example 4

Referring to fig. 1 to 12, the following technical features are added to the embodiment 1, 2 or 3 in this embodiment: on the upper surface of the moving rod 42, a length scale mark 3 capable of displaying the distance from the center of the positioning tube 11 to the center of the movable tube 12 is provided. Other technical features in this embodiment are the same as those in embodiment 1, 2 or 3, and are not described herein again.

Example 5

Referring to fig. 8 to 11, the following technical features are added to the embodiments 1 or 2 or 3 or 4 in this embodiment: an angle scale marking 5 is also provided at the first end of the positioning tube 11. Other technical features in this embodiment are the same as those in embodiment 1 or 2 or 3 or 4, and are not described herein again.

The above description of the embodiments is only for the understanding of the present invention. It should be noted that modifications could be made to the invention without departing from the principle of the invention, which would also fall within the scope of the claims of the invention.