CN217472012U - Auxiliary measuring tool - Google Patents

Abstract

The utility model provides an auxiliary measuring tool for orthopedic surgery. The auxiliary measuring tool comprises a main body, a driving piece, a locking piece and an elastic piece; the main body is used for movably connecting with the spoon-shaped measurer; the driving piece is movably arranged on the main body; the locking piece is movably arranged on the main body and is used for moving under the driving of the driving piece; elastic component telescopically sets up in the main part to utilize elastic force to press to spoon form caliber under the drive of locking piece, realize the fixed between spoon form caliber and the main part, therefore spoon form caliber is adjusted to suitable position after, can in time be fixed, avoid spoon form caliber because of the unfixed inaccurate problem of osteotomy measurement that leads to of position, locking easy operation is convenient simultaneously, also can realize the quick locking and the unblock of spoon form caliber, improve operation efficiency.

Description

Auxiliary measuring tool

Technical Field

The utility model relates to a medical treatment auxiliary assembly field, in particular to an auxiliary measuring tool for bone surgery.

Background

The knee joint replacement operation is a process of removing damaged bones at the tail ends of thighbones and shinbones and implanting prostheses into the surfaces of the tail ends of the thighbones and the shinbones to replace human knee joints. In the operation, the tibia osteotomy accuracy is a key factor for success of a prosthesis replacement operation, an accurate lower limb force line must be established for obtaining accurate tibia osteotomy amount and an accurate osteotomy angle, and the osteotomy amount of the tibia end needs to be determined in the process. Currently, a surgeon determines the amount of resection to be made to the end of the tibia during the procedure using a tibial measurement instrument that is mounted on the resection guide and then measures the distance between the tibial plateau and the resection site.

The current tibia measuring devices are mainly divided into probe-type measuring devices and spoon-shaped measuring devices. The prior spoon-shaped measuring device is generally connected to the osteotomy guide through an auxiliary tool, and the position of the spoon-shaped measuring device is adjusted through the auxiliary tool, but the spoon-shaped measuring device cannot be positioned and locked with the auxiliary tool after being adjusted to an accurate position, so that the problem that the spoon-shaped measuring device is shaken left and right to deviate from the accurate position easily occurs. In addition, although the existing auxiliary tool can be fixedly connected with the osteotomy guide, the problems of complex structure and inconvenient operation exist in the fixed connection mode, the convenience of disassembly and assembly between the devices is also influenced, the operation time is finally prolonged, and the operation efficiency is reduced.

Therefore, it is necessary to develop an auxiliary measuring tool capable of locking the spoon-shaped measuring instrument and the auxiliary tool to help the operator accurately and rapidly measure the osteotomy amount of the tibia during the orthopedic operation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an auxiliary measuring tool to solve the problem that current spoon form caliber adjusts can't lock after the accurate position.

In order to solve the technical problem, the utility model provides an auxiliary measuring tool which is used for orthopedic surgery and comprises a main body, a driving piece, a locking piece and an elastic piece; the main body is used for being detachably connected with the spoon-shaped measurer; the driving piece is movably arranged on the main body; the locking piece is movably arranged on the main body and is used for moving along a first direction under the driving of the driving piece; the elastic piece is arranged on the main body in a telescopic mode and is used for pressing the spoon-shaped measurer under the driving of the locking piece by utilizing elastic force so as to lock the spoon-shaped measurer and the main body.

Optionally, the auxiliary measuring tool further comprises the spoon-shaped measuring tool, the spoon-shaped measuring tool is movably connected with the main body, and the moving direction of the spoon-shaped measuring tool is along a second direction, and the second direction is perpendicular to the first direction.

Optionally, a guide mounting groove is formed in the main body and is used for being detachably connected with the osteotomy guide; the locking element is also used for pressing against the osteotomy guide under the driving of the driving element so as to lock the main body and the osteotomy guide.

Optionally, the driving member includes a driving wheel, the driving wheel is an eccentric wheel or a cam, the driving wheel is rotatably disposed on the main body, a rotation axis of the driving wheel is along a third direction, the third direction is perpendicular to the first direction, and a movement axis of the locking member passes through the rotation axis of the driving wheel.

Optionally, a handle is provided on the driving wheel, the locking member comprises a head and a rod connected, the head contacts the driving wheel, and the elastic member is located between the head and the spoon-shaped measuring device.

Optionally, the auxiliary measuring tool further comprises a pressing part, and the pressing part is arranged on the main body; the elastic piece is positioned between the spoon-shaped measurer and the locking piece; the pressing and abutting piece is positioned between the elastic piece and the spoon-shaped measurer; the pressing and abutting piece is used for contacting the elastic piece so as to transmit the elastic force to the spoon-shaped measurer.

Optionally, the pressing member comprises a pad and a rolling member; the gasket is fixedly arranged on the main body; the rolling piece is movably arranged on the main body; the pad is positioned between the elastic piece and the rolling piece, and the rolling piece is positioned between the pad and the spoon-shaped measurer.

Optionally, the rolling elements are symmetrically distributed around the axis of movement of the locking member.

Optionally, the elastic member is a belleville spring, a coil spring or a spring plate.

Optionally, the spoon-shaped measuring device comprises a spoon and a handle which are connected, the spoon is arc-shaped, the handle is movably connected with the main body, and the thickness of the spoon is gradually reduced from one end close to the handle to the other end.

The utility model provides an among the auxiliary measuring instrument, utilize the removal of the motion drive locking piece of driving piece, and the locking piece removes the back and acts on the elastic component, makes the elastic component produce elastic force and lock spoon form caliber and main part, makes spoon form caliber and main part keep relatively fixed. Therefore, in the bone surgery process, after the spoon-shaped measuring device is adjusted to a proper position, the spoon-shaped measuring device can be locked in time, the spoon-shaped measuring device is positioned at an accurate position, the left and right shaking of the spoon-shaped measuring device is avoided, the problem of deviating the accurate position is caused, and therefore the accuracy of osteotomy measurement is ensured. In addition, this auxiliary measuring instrument locks spoon form caliber and main part only through the elastic force of elastic component, and locking simple structure, convenient operation can also realize the quick assembly disassembly of spoon form caliber moreover, reduces the operation time, improves operation efficiency.

The utility model provides an among the assistant measuring tool, utilize the director mounting groove in the main part can be connected with the bone cutting director to usable locking piece locking bone cutting director and main part. This locking mode can lock spoon form caliber and osteotomy director simultaneously, simple structure, and it is very convenient to operate, can realize the quick assembly disassembly between osteotomy director and the supplementary measuring tool moreover, further reduces operation time, improves operation efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of an assembly structure of an auxiliary measuring tool according to a preferred embodiment of the present invention;

FIG. 2 is an axial cross-sectional view of an auxiliary measuring tool according to a preferred embodiment of the present invention when unlocked;

fig. 3 is a schematic structural diagram of a main body according to a preferred embodiment of the present invention at a first viewing angle;

fig. 4 is a schematic structural view of a main body according to a preferred embodiment of the present invention at a second viewing angle;

figure 5 is a schematic structural view of a driving member according to a preferred embodiment of the present invention;

fig. 6 is a schematic structural view of a rolling member according to a preferred embodiment of the present invention;

fig. 7 is a schematic structural view of a gasket according to a preferred embodiment of the present invention;

fig. 8 is a schematic structural view of a belleville spring according to a preferred embodiment of the present invention;

fig. 9 is an axial cross-sectional view of a belleville spring according to a preferred embodiment of the present invention;

fig. 10 is a schematic structural view of a locking member according to a preferred embodiment of the present invention;

fig. 11 is a schematic structural view of a spoon-shaped measuring device according to a preferred embodiment of the present invention;

fig. 12 is a schematic structural view of the auxiliary measuring tool according to the preferred embodiment of the present invention when locked.

In the figure: 1-a body; 11-a first via; 12-an axial through hole; 13-a guide mounting groove; 14-mounting holes; 15-a measurer mounting groove; 2-driving wheels; 21-a second via; 22-a handle; 3-rolling elements; 31-spherical surface; 4-a gasket; 41-inner hole of gasket; 5-an elastic member; 51-inner hole of butterfly spring; 6-a locking element; 61-a head; 62-a rod portion; 7-spoon-shaped measuring device; 71-a spoon; 72-a handle; 73-chute.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that when a portion is referred to as being "secured to" another portion, it can be directly on the other portion or there can be an intervening portion. When a portion is said to be "connected" to another portion, it may be directly connected to the other portion or intervening portions may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model discloses a core thinking lies in providing an auxiliary measuring instrument for adjust and lock spoon form caliber, this auxiliary measuring instrument is used for bone surgery, mainly used knee joint replacement art, with measurement shin bone osteotomy size.

Specifically, the auxiliary measuring tool comprises a main body, a driving piece, a locking piece and an elastic piece, and preferably further comprises a spoon-shaped measuring tool. Wherein the main body is used for being detachably connected with the spoon-shaped measurer; the driving piece is movably arranged on the main body; the locking piece is movably arranged on the main body and is used for moving along a first direction under the driving of the driving piece; the elastic part is arranged on the main body in a telescopic mode and used for pressing and abutting the spoon-shaped measuring device under the driving of the locking part through elastic force, and therefore the spoon-shaped measuring device and the main body are locked. So structure, at the bone surgery in-process, adopt spoon form caliber to confirm the bone cutting volume of tibial end to after spoon form caliber is adjusted to suitable position, can in time be locked, avoid spoon form caliber to control and rock, lead to the problem of skew accurate position, thereby ensure the accuracy of bone cutting volume measurement. In addition, this auxiliary measuring instrument locks spoon form caliber and main part only through the elastic force of elastic component, and locking simple structure, convenient operation can also realize the quick assembly disassembly of spoon form caliber moreover, reduces the operation time, improves operation efficiency.

The structure of the driving member is not limited in the application, and if the driving member is not limited in the form of a driving wheel, the driving member may also be other mechanisms capable of driving the locking member to move linearly, such as a guide rail slider, a rack and pinion, a lead screw nut, a linear motor, and the like, as long as the locking member can be driven to move in a rotating or moving manner.

The auxiliary measuring tool provided by the present invention is further described with reference to the drawings and preferred embodiments. In the following embodiments, features of the embodiments can be supplemented with each other or combined with each other without conflict. For the sake of simplicity, the following description assumes that the driving member is a driving wheel, and a person skilled in the art should be able to modify the following description for cases other than driving wheels, with appropriate modifications in detail.

As shown in fig. 1 to 2, the auxiliary measuring tool provided in this embodiment includes a main body 1, a driving wheel 2, a rolling member 3, a pad 4, an elastic member 5, a locking member 6, and a spoon-shaped measuring device 7; wherein the rolling element 3 and the gasket 4 constitute a pressing element, and the pressing element and/or the spoon-shaped measuring element 7 are/is of a preferred structure.

In particular, the body 1 is intended to be removably connected to a spoon-shaped measuring device 7. The driving wheel 2 is rotatably provided on the main body 1. The locking member 6 is movably arranged on the main body 1 and is adapted to be moved in a first direction by the drive wheel 2, i.e. the axis of movement of the locking member 6 is in a first direction, which first direction is defined as Z-direction, but Z-direction is not specifically intended to be vertical. The elastic member 5 is telescopically arranged on the main body 1, and the elastic member 5 has elasticity. The elastic member 5 may be located between the locking member 6 and the spoon-shaped measuring member 7. The elastic piece 5 is used for pressing the spoon-shaped measuring device 7 under the driving of the locking piece 6 by using elastic force, so that the spoon-shaped measuring device 7 and the main body 1 are locked, and the spoon-shaped measuring device 7 and the main body 1 are kept relatively fixed. In the present application, the elastic member 5 may directly abut against the spoon-shaped measuring instrument 7, or may indirectly abut against the spoon-shaped measuring instrument 7 through the pressing member. Further, the pressing piece is arranged on the main body 1; the elastic element 5 is positioned between the spoon-shaped measuring element 7 and the locking element 6; the pressing and abutting piece is positioned between the elastic piece 5 and the spoon-shaped measurer 7; the pressing and abutting piece is used for contacting the elastic piece 5 so as to transmit elastic force to the spoon-shaped measurer 7 and tightly press and fix the spoon-shaped measurer 7.

In more detail, in actual operation, when the driving wheel 2 rotates towards a predetermined direction, the locking member 6 is driven to move towards the first direction, and the elastic member 5 is compressed, so that the elastic member 5 stores elastic potential energy, and the elastic force of the elastic member 5 is finally transmitted to the spoon-shaped measurer 7, and the spoon-shaped measurer 7 is pressed and fixed. And it is understood that said spoon-like measurer 7 is movably arranged on the body 1, and has a moving state and a fixed state; when the spoon-shaped measurer 7 is in a moving state, it can move in a second direction with respect to the main body 1, the second direction may be an X direction or a Y direction, that is, the second direction is perpendicular to the first direction, but may be parallel to a third direction in the following description or perpendicular to the third direction, but the Y direction and the X direction are not particularly horizontal directions; when the spoon-shaped measuring device 7 is in a fixed state, it is fixed to the main body 1 and is relatively stationary. The third direction is a direction in which the rotation axis of the driving wheel 2 is located, the third direction is perpendicular to the first direction, and the third direction is defined as an X direction. Preferably, the moving axis of the locking member 6 passes through the rotating axis of the driving wheel 2, so that the driving wheel 2 can realize self-locking, the driving wheel 2 is prevented from being pushed by the locking member 6 to rotate, and the safety is ensured.

It should also be understood that the auxiliary measuring tool provided in this embodiment may be configured with the spoon-shaped measuring device 7, or an external spoon-shaped measuring device 7 may be used. Preferably, the auxiliary measuring means comprise a spoon-like measuring device 7.

The working principle of the above-mentioned auxiliary measuring tool will be described next. As shown in fig. 2, when the spoon-shaped measuring instrument 7 is in an unlocked state, the spoon-shaped measuring instrument 7 is not pressed by the elastic force and can move relative to the main body 1, so that the spoon-shaped measuring instrument 7 is adjusted to a proper position; after the spoon-shaped measuring device 7 is adjusted to a proper position, the driving wheel 2 can be manually driven to rotate, if the driving wheel 2 rotates from the position shown in fig. 2 to the position shown in fig. 12, in the process of rotating the driving wheel 2, the locking member 6 is driven to move in the direction away from the driving wheel 2 and compress the elastic member 5, the compression force of the elastic member 5 is directly or indirectly transmitted to the spoon-shaped measuring device 7, and the spoon-shaped measuring device 7 is further pressed, so that the locking state (i.e. the fixed state) shown in fig. 12 is obtained.

When being applied to knee joint replacement operation with the auxiliary measuring tool that this embodiment provided, can help accurate, the rapid survey shin bone of operating personnel to cut the bone volume, improve the accuracy of cutting the bone volume and the security of operation, the dismouting of spoon form caliber is simple and convenient moreover, has reduced the operation time, has improved operation efficiency.

As shown in fig. 4, in an example, the main body 1 is provided with a first through hole 11, and the first through hole 11 is connected with the driving wheel 2 through a pin so that the driving wheel 2 rotates relative to the main body 1. The axis of the first through hole 11 is in the third direction, i.e. the axis of rotation of the driving wheel 2 is in the third direction. As shown in fig. 5, in an example, the driving wheel 2 is provided with a second through hole 21, and the second through hole 21 is connected with the main body 1 through the pin. As shown in fig. 3, in one example, the main body 1 is provided with an axial through hole 12, and the locking member 6 is movably disposed in the axial through hole 12. The axis of said axial through hole 12 is along a first direction.

As shown in fig. 4, the main body 1 is preferably provided with a guide mounting groove 13, the guide mounting groove 13 is used for detachably connecting the osteotomy guide, and the locking member 6 is also used for pressing against the osteotomy guide under the driving of the driving wheel 2, thereby locking the osteotomy guide with the main body 1, and thus fixing the whole auxiliary measuring tool on the osteotomy guide. This structure has realized the quick locking and the unblock of auxiliary measuring instrument and osteotomy director, simple structure, and it is very convenient to operate, can realize the quick assembly disassembly between osteotomy director and the auxiliary measuring instrument moreover, further reduces the operation time, improves operation efficiency.

In a preferred embodiment, as shown in fig. 5, the driving wheel 2 has a handle 22, and the operator can pull the handle 22 of the driving wheel 2 to drive the driving wheel 2 to rotate, so that the operation is more convenient. Further, the driving wheel 2 may be an eccentric or a cam, i.e. the profile of the driving wheel 2 has at least 2 different distances to its axis of rotation, so that the locking member 6 has a different position in the first direction when different points on the profile of the driving wheel 2 abut against the locking member 6. Preferably, the distance between the profile of the drive wheel 2 and its axis of rotation is gradually increased or decreased in the circumferential direction of the drive wheel 2, so that the locking member 6 is gradually raised or gradually lowered in the first direction during rotation of the drive wheel 2 about its axis.

In a particular embodiment, as shown in fig. 10, the locking element 6 comprises a head 61 and a shaft 62 connected, the head 61 being arranged at one end of the shaft 62, the other end of the shaft 62 being intended to be pressed against the osteotomy guide, and the head 61 having a cross-sectional dimension that is larger than the cross-sectional dimension of the shaft 62. Wherein the head 61 contacts the drive wheel 2 and the elastic element 5 is located between the head 61 and the spoon 7. Further, the head 61 is fixedly connected with the elastic member 5.

The structure of the elastic member 5 is not limited in the present application. As shown in fig. 8 and 9, in a specific embodiment, the elastic member 5 is a belleville spring having a through inner hole 51, and the inner hole 51 is used for the rod 62 of the locking member 6 to pass through. Further, the belleville spring may be fixed to the head 61 of the locking member 6 by means of a pin. However, the elastic member 5 may be a coil spring, a spring plate, or an elastic member of other structure besides the belleville spring.

Further, the pressing member includes a rolling member 3 and a spacer 4. The spacer 4 is fixedly provided on the main body 1, and the spacer 4 is provided between the elastic member 5 and the rolling member 3, while the spacer 4 is provided to directly contact the elastic member 5. The rolling element 3 is movably arranged on the main body 1, and the rolling element 3 is arranged between the gasket 4 and the spoon-shaped measuring device 7, so that the rolling element 3 is directly contacted with the gasket 4 and the spoon-shaped measuring device 7. Therefore, the elastic force from the elastic part 5 is transmitted through the gasket 4 and the rolling part 3 to press the spoon-shaped measuring device 7, the pressing effect is better, the abrasion of the structure can be reduced, and the locking reliability is ensured.

In a specific embodiment, as shown in fig. 3, the main body 1 is provided with a mounting hole 14, and the rolling member 3 is movably disposed in the mounting hole 14. The shape of the rolling elements 3 is not fixed. Generally, the rolling members 3 are spherical or cylindrical balls.

In a specific embodiment, as shown in fig. 6, the rolling members 3 are spherical balls and have spherical surfaces 31, the mounting holes 14 are preferably hemispherical holes, and the rolling members 3 are disposed in the hemispherical mounting holes 14. Preferably, the rolling elements 3 are symmetrically distributed around the axis of movement of the locking element 6, so that the force is uniform and the spoon-shaped measuring element 7 can be pressed better.

In one embodiment, as shown in fig. 7, the shim 4 has an inner hole 41, and the inner hole 41 of the shim 4 is used for the shaft 62 of the locking member 6 to pass through.

Further, the direction of movement of the spoon measure 7 may be parallel or perpendicular to the axis of rotation of the drive wheel 2, i.e. the third direction may be parallel or perpendicular to the second direction. In this embodiment, the direction of movement of the spoon-shaped measuring instrument 7 is parallel to the direction of the axis of rotation of the drive wheel 2.

As shown in fig. 4, in a specific embodiment, a measuring device mounting groove 15 is formed on the main body 1, the spoon-shaped measuring device 7 is movably connected to the measuring device mounting groove 15, and the measuring device mounting groove 15 can axially limit the spoon-shaped measuring device 7 to prevent the spoon-shaped measuring device 7 from falling off.

In a particular embodiment, as shown in figure 11, the spoon-like measure 7 comprises an integral spoon 71 and handle 72. The spoon 71 is formed in an arc shape and preferably has a thickness gradually decreasing from one end near the handle 72 to the other end so as to be suitable for different patients to obtain different osteotomy amounts. Optionally, the thickness of the spoon 71 is 1.0mm to 5.0 mm. The handle 72 is movably connected with the main body 1. The handle 72 may be a flat plate structure, and a sliding groove 73 is formed in the handle 72, an extending direction of the sliding groove 73 is along the second direction, and the sliding groove 73 is connected to the measurer mounting groove 15 of the main body 1. The length of the slide groove 73 in the second direction is smaller than the length of the handle 72. Further, one end of the sliding groove 73, which is far away from the spoon 71, is provided with a larger dismounting hole, which is communicated with the sliding groove 73. The spoon-shaped measuring device 7 can be smoothly sleeved on the main body 1 through the dismounting hole and can also be smoothly taken down from the main body 1. It will be appreciated that the spoon-like gauge 7 has a spoon 71 conforming to the radius of the femoral prosthesis, said spoon 71 being applied against the posterior condyle of the femur, simulating the location of the distal intact cartilage of the femur by the thickness of the nearly intact posterior condyle cartilage, and measuring the distance between the tibial plateau and the osteotomy site.

The technical features of the above-mentioned preferred embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered as being described in the present specification.

The above-mentioned preferred embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (10)

1. An auxiliary measuring tool for orthopedic surgery is characterized by comprising a main body, a driving piece, a locking piece and an elastic piece; the main body is used for being detachably connected with the spoon-shaped measurer; the driving piece is movably arranged on the main body; the locking piece is movably arranged on the main body and is used for moving along a first direction under the driving of the driving piece; the elastic piece is arranged on the main body in a telescopic mode and is used for pressing the spoon-shaped measurer under the driving of the locking piece by utilizing elastic force so as to lock the spoon-shaped measurer and the main body.

2. The auxiliary measuring tool of claim 1, further comprising the spoon-shaped measuring device movably coupled to the body, the spoon-shaped measuring device moving in a second direction perpendicular to the first direction.

3. The auxiliary measuring tool of claim 1 or 2, wherein the main body is provided with a guide mounting groove for detachable connection with an osteotomy guide; the locking element is also used for pressing against the osteotomy guide under the driving of the driving element so as to lock the main body and the osteotomy guide.

4. Auxiliary measuring tool according to claim 1 or 2, wherein the driving member comprises a driving wheel, which is an eccentric or cam, which is rotatably arranged on the body, the axis of rotation of the driving wheel being in a third direction, which is perpendicular to the first direction, and the axis of movement of the locking member passing through the axis of rotation of the driving wheel.

5. An auxiliary measuring tool as claimed in claim 4 wherein a handle is provided on the drive wheel and the locking member comprises a head and a shaft connected, the head contacting the drive wheel and the resilient member being located between the head and the spoon measure.

6. The auxiliary measuring tool of claim 1 or 2, further comprising a press member provided on the main body; the elastic piece is positioned between the spoon-shaped measurer and the locking piece; the pressing and abutting piece is positioned between the elastic piece and the spoon-shaped measurer; the pressing and abutting piece is used for contacting the elastic piece so as to transmit the elastic force to the spoon-shaped measurer.

7. The auxiliary measuring tool of claim 6 wherein the pressing member comprises a washer and a roller; the gasket is fixedly arranged on the main body; the rolling piece is movably arranged on the main body; the pad is positioned between the elastic piece and the rolling piece, and the rolling piece is positioned between the pad and the spoon-shaped measurer.

8. Auxiliary measuring tool according to claim 7, characterized in that the rolling elements are symmetrically distributed around the axis of movement of the locking member.

9. An auxiliary measuring tool according to claim 1 or 2, wherein the resilient member is a belleville spring, a coil spring or a leaf spring.

10. The auxiliary measuring tool of claim 2, wherein the spoon-shaped measuring instrument comprises a spoon and a handle connected, the spoon is arc-shaped, the handle is movably connected with the main body, and the thickness of the spoon is gradually reduced from one end near the handle to the other end.

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