Device for measuring shoulder imbalance

Abstract

The utility model discloses a device for measuring shoulder unbalance. The device comprises a main ruler provided with a gradienter, an auxiliary ruler, a first reference ruler and a second reference ruler, the first reference ruler and the auxiliary ruler are arranged on the main ruler in a sliding mode and respectively have a first state of folding and retracting with the main ruler and a second state of unfolding with the main ruler, and the sliding direction of the first reference ruler and the sliding direction of the auxiliary ruler are opposite or opposite in the length direction of the main ruler. The second reference ruler is arranged on the auxiliary ruler in a sliding manner and has a first state in which the auxiliary ruler is folded and retracted and a second state in which the auxiliary ruler is unfolded; when the second reference ruler, the first reference ruler and the auxiliary ruler are all in the second state of stretching and opening, the first reference ruler, the main ruler and the auxiliary ruler are perpendicular to each other, and the first reference ruler and the second reference ruler are parallel and located on the same side of the main ruler. According to the scheme, the problems that an existing shoulder unbalance measuring method is poor in measuring result accuracy and large in measuring limitation can be solved, and the device for measuring the shoulder unbalance can be conveniently carried and used by medical staff.

Description

Technical Field

[0001] The utility model relates to the technical field of medical measuring instruments, in particular to a device for measuring shoulder imbalance. Background Art

[0002] Scoliosis primarily occurs in adolescents and is another major health risk to Chinese youth, following myopia and obesity. Treatment typically involves functional exercises and braces, with severe cases requiring surgery. However, scoliosis is more than just a curvature of the spine; it is also accompanied by trunk tilt, razorback deformity, and shoulder imbalance. Shoulder imbalance is not only an aesthetic concern for patients and their families, but also clinically, the height of the shoulder can influence surgical planning.

[0003] Currently, the main clinical method for assessing shoulder balance is to have the patient stand in front of a wall with horizontal and vertical standard lines interwoven into a grid, and estimate the shoulder height by observing the shoulders on both sides and the corresponding horizontal standard lines, or to measure on an X-ray. However, the method of estimating by wall standard lines not only has the problem of inaccurate measurement results, but also requires the patient to stand in front of a specific wall during measurement, resulting in great limitations in its measurement. The results of X-ray measurements are also somewhat different from those of direct photography. Therefore, there is currently a lack of a measurement tool that can not only accurately measure and assess shoulder imbalance, but also is convenient for medical staff to carry and use. Utility Model Content

[0004] The utility model discloses a device for measuring shoulder imbalance, which solves the problems of poor measurement accuracy and large measurement limitations in current shoulder imbalance measurement methods. The device for measuring shoulder imbalance can also be convenient for medical staff to carry and use.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] The utility model provides a device for measuring shoulder imbalance, which includes a main ruler, a sub-rule, a first reference ruler and a second reference ruler; the first reference ruler and the sub-rule are both slidably arranged on the main ruler, and respectively have a first state of rotating to be folded and retracted with the main ruler and a second state of being stretched and opened, and the sliding directions of the first reference ruler and the sub-rule are opposite to or opposite to each other along the length direction of the main ruler; the second reference ruler is slidably arranged on the sub-rule, and has a first state of being folded and retracted with the sub-rule and a second state of being stretched and opened; when the second reference ruler, the first reference ruler and the sub-rule are all in the second state of being stretched and opened, the first reference ruler, the main ruler and the sub-rule are perpendicular to each other, the first reference ruler and the second reference ruler are parallel, and are located on the same side of the main ruler; the main ruler is provided with a spirit level for observing and confirming the horizontal state of the main ruler.

[0007] Optionally, the bottom surface of the main ruler is provided with a groove extending along the length direction of the main ruler, and one side of the groove passes through one side surface of the main ruler, and the main ruler forms a travel range with a "┏"-shaped cross-section; the first reference ruler includes a sliding portion and a cross bar, the sliding portion is slidably arranged in the groove, and one end of the cross bar is rotatably connected to the sliding portion, so that the cross bar is rotated to a first state in which it is folded and retracted in the groove and a second state in which it is extended and opened horizontally and perpendicularly to the main ruler.

[0008] Optionally, a first guide hole is provided at the back of the travel range of the main scale along the length extension direction of the main scale; the sliding part is provided with a first guide screw that slides with the first guide hole, and the first guide screw passes through the first guide hole and is connected to the first fastening nut through a threaded structure.

[0009] Optionally, the secondary ruler includes a slider and a ruler part; the slider is provided with a "T"-shaped slide groove, and is slidably embraced on the main ruler through the "T"-shaped slide groove; the ruler part is rotatably connected to the slider, and is used for the ruler part to rotate to a first state in which it is folded and retracted and parallel to the main ruler and a second state in which it is vertically perpendicular to the main ruler and stretched and opened.

[0010] Optionally, a connecting rod is provided at the bottom end of the ruler part, and a ball head is provided at the end of the connecting rod, and the radial size of the ball head is larger than the radial size of the connecting rod; the top surface of the slider is provided with a first slide groove and a second slide groove that are connected, the shape of the first slide groove is adapted to the connecting rod, and extends to one side side of the slider in the sliding direction of the main ruler to form a first opening; the second slide groove includes a lower slide groove whose shape is adapted to the ball head and an upper slide groove adapted to the connecting rod, and the second slide groove extends to one side side of the slider in a direction perpendicular to the main ruler to form a second opening; a secondary scale slide groove is provided on one side side of the slider where the second opening is located in the vertical direction, and the secondary scale slide groove is located on the side where the first reference ruler is extended and opened, and is exposed to the main ruler; the second opening is located on the bottom surface of the secondary scale slide groove.

[0011] Optionally, the slider is a structural member made of a transparent material; the scale surfaces of the main ruler and the secondary ruler are both provided with length scales distributed along the length direction, and the middle position of the length scale of the main ruler is marked as the zero line position, and one end of the length scale of the secondary ruler is marked as the zero line position.

[0012] Optionally, an angle scale is provided on the side surface of the slider facing away from the secondary scale slot, and the zero line of the angle scale is parallel to the main scale and is located at the center of the lower slot of the second slot; when the secondary scale is in a folded and retracted state, the bottom surface of the second reference scale in the extended and opened state is located in the same plane as the bottom surface of the first reference scale, and the rotating surface of the secondary scale extended and opened around the second slot along the first slot through the ball head is perpendicular to the plane where the main scale is located.

[0013] Optionally, the secondary ruler slot is a "T"-shaped slot, the cross-sectional shape of the secondary ruler is a "convex" shape adapted to the "T"-shaped slot, and the side wall of the secondary ruler slot is provided with a tightening bolt for fixing the secondary ruler; the second reference ruler is slidably arranged on the convex part of the secondary ruler, and the convex part of the secondary ruler is located outside the secondary ruler slot.

[0014] Optionally, a second guide hole extending along the length direction is provided on the side of the convex portion of the secondary ruler; the second reference ruler is connected to one end of the adjusting bolt, and the other end of the adjusting bolt passes through the first adjusting nut and the second guide hole in sequence and cooperates with the second adjusting nut; or, the second reference ruler is connected to one end of the fastening bolt through a telescopic structure, and the other end of the fastening bolt passes through the second guide hole and cooperates with the fastening nut.

[0015] Optionally, the "convex" structure of the secondary ruler is a structural member made of a square structure, and the connecting tube and the ball head are located at the center of the square.

[0016] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0017] The device for measuring shoulder imbalance disclosed by the present invention can determine the shoulder imbalance height of the patient to be measured by the bottom surface of the stretched-out first reference ruler and the bottom surface of the second reference ruler and the length scale corresponding to the secondary ruler when measuring the patient to be measured, and determine the shoulder imbalance angle of the patient to be measured by the angle between the secondary ruler and the main ruler; therefore, compared with the shoulder imbalance measurement method currently used in clinical practice, the present invention can not only realize the accurate measurement of shoulder imbalance height and imbalance angle, but also be clinically applicable to patients with different shoulder widths and those who are inconvenient to stand, which significantly expands the scope of application of shoulder imbalance measurement; at the same time, the second reference ruler, the secondary ruler and the first reference ruler can also be folded and retracted to a state where they overlap with the main ruler, thereby making it convenient for medical staff to store, carry and use them for measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 This is a structural schematic diagram of the device for measuring shoulder imbalance disclosed in an embodiment of the present utility model in a measuring state;

[0020] Figure 2 It is a structural schematic diagram of the slider disclosed in the embodiment of the present utility model;

[0021] Figure 3 for Figure 2 Side view of;

[0022] Figure 4 This is a schematic diagram of the second reference ruler disclosed in the embodiment of the present invention in the initial state of measuring the shoulder imbalance angle;

[0023] Figure 5 This is a schematic structural diagram of the device for measuring shoulder imbalance disclosed in an embodiment of the present utility model in a folded and retracted state;

[0024] Description of reference numerals:

[0025] 100-main ruler, 101-groove, 102-first guide hole, 110-first reference ruler, 200-second ruler, 201-second guide hole, 202-connecting rod, 203-ball head, 210-second reference ruler, 211-, fastening bolt, 212-fastening nut, 213-sleeve-type telescopic rod, 220-slider, 221-main ruler slide, 222-second ruler slide, 223-first slide, 224-second slide, 2241-upper slide, 2242-lower slide, 225-tightening bolt. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0027] The technical solutions disclosed in various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] Please refer to Figures 1 to 5 As shown, an embodiment of the present invention discloses a device for measuring shoulder imbalance, which includes a main ruler, a sub-rule, a first reference ruler and a second reference ruler; the first reference ruler and the sub-rule are both slidably arranged on the main ruler, and respectively have a first state of rotating to be folded and retracted with the main ruler and a second state of being stretched and opened, and the sliding directions of the first reference ruler and the sub-rule are opposite to or opposite to each other along the length direction of the main ruler; the second reference ruler is slidably arranged on the sub-rule, and has a first state of being folded and retracted with the sub-rule and a second state of being stretched and opened; when the second reference ruler, the first reference ruler and the sub-rule are all in the second state of being stretched and opened, the first reference ruler, the main ruler and the sub-rule are perpendicular to each other, the first reference ruler and the second reference ruler are parallel, and are located on the same side of the main ruler.

[0029] When measuring the shoulder imbalance height of the patient, Figure 1As shown, the positions of the stretched first reference ruler and the sub-rule can be adjusted by sliding along the main ruler so that the stretched first reference ruler and the second reference ruler are respectively located on both sides of the middle position of the main ruler, and the horizontal distances between the first reference ruler and the second reference ruler and the middle position of the main ruler are equal; then, the main ruler is placed horizontally on the back of the patient to be measured so that the middle position of the main ruler is opposite to the center of the back of the patient to be measured, the bottom surface of the stretched first reference ruler is against one shoulder of the patient to be measured, and the stretched second reference ruler is adjusted by sliding in the vertical direction along the stretched sub-rule so that the bottom surface of the second reference ruler is against the other shoulder of the patient to be measured, thereby determining the height difference between the bottom surfaces of the first reference ruler and the second reference ruler and the length scale corresponding to the vertical sub-rule, that is, the shoulder imbalance height of the patient to be measured.

[0030] When measuring the shoulder imbalance angle of the patient to be measured, the positions of the extended first reference ruler and the folded and retracted secondary ruler can be adjusted by sliding along the main ruler so that the rotating end of the secondary ruler and the first reference ruler are located at the same position on one side of the middle position of the main ruler; then the extended second reference ruler is adjusted by sliding along the secondary ruler so that the second reference ruler is located on the other side of the middle position of the main ruler, and the bottom surface of the first reference ruler and the bottom surface of the second reference ruler are located on the same horizontal plane, and the horizontal distances from the middle position of the main ruler are equal; then, the main ruler is placed horizontally on the back of the patient to be measured so that the middle position of the main ruler is opposite to the center of the back of the patient to be measured, the bottom surface of the extended first reference ruler is against one shoulder of the patient to be measured, and the secondary ruler is rotated in the vertical plane from the extended and extended position to the folded and retracted position around the rotating end of the secondary ruler so that the bottom surface of the second reference ruler is against the other shoulder of the patient to be measured, thereby determining the shoulder imbalance angle of the patient to be measured by the angle between the secondary ruler and the main ruler.

[0031] Therefore, compared with the shoulder imbalance measurement method currently used in clinical practice, this embodiment provides a device specifically used for measuring shoulder imbalance, which can not only accurately measure the shoulder imbalance height and imbalance angle, but is also clinically applicable to patients with different shoulder widths and those who are inconvenient to stand, significantly expanding the scope of application of shoulder imbalance measurement; at the same time, the second reference ruler, the auxiliary ruler and the first reference ruler can also be folded and retracted to a state where they overlap with the main ruler, thereby facilitating storage, carrying and measurement by medical staff.

[0032] Specifically, if Figure 4 and Figure 5As shown, the bottom surface of the main ruler is provided with a groove extending along the length direction of the main ruler, and one side of the groove passes through one side surface of the main ruler, and the main ruler forms a travel range with a "┏"-shaped cross section; the first reference ruler includes a sliding portion and a cross bar, the sliding portion is slidably arranged in the groove, and one end of the cross bar is rotatably connected to the sliding portion, and is used for the cross bar to be rotated to a first state in which it is folded and retracted in the groove and a second state in which it is stretched and opened horizontally and perpendicularly to the main ruler, thereby realizing the folding and hiding of the second reference ruler through the "┏"-shaped groove structure, which is conducive to reducing the design thickness of the entire device to achieve a lightweight design.

[0033] Preferably, in order to facilitate medical staff to more accurately read and determine the length scale of the bottom surface of the first reference ruler corresponding to the vertical secondary ruler, the bottom surface of the first reference ruler is flush with the bottom surface of the main ruler, so that the position of the length scale of the bottom surface of the first reference ruler corresponding to the secondary ruler can be determined by the length scale of the bottom surface of the main ruler corresponding to the vertical secondary ruler. Compared with the method of moving the first reference ruler to the position of the secondary ruler during measurement, the reading and determination of the length scale corresponding to the bottom surface of the first reference ruler and the vertical secondary ruler is more convenient and quick.

[0034] At the same time, as a feasible implementation of the sliding design, a first guide hole is provided on the back of the travel range of the main scale along the length extension direction of the main scale; the sliding portion is provided with a first guide screw that slides with the first guide hole. The first guide screw passes through the first guide hole and is connected to the first fastening nut via a threaded structure. When the first reference scale needs to be slidably moved, the first fastening nut is loosened to allow the first guide screw to slide along the first guide hole to the desired position, thereby adjusting the position of the first reference scale. After adjustment, the first fastening nut is tightened to fix the position of the first reference scale. The first guide hole not only provides horizontal guidance for the sliding movement of the first reference scale along the main scale, but also helps to reduce the weight of the main scale.

[0035] In the device for measuring shoulder imbalance disclosed in this embodiment, Figure 1 As shown, the secondary ruler may include a slider and a ruler portion; the slider is provided with a "T"-shaped slide groove, and is slidably embraced on the main ruler through the "T"-shaped slide groove, thereby realizing the sliding setting of the secondary ruler and the main ruler through the slider; the ruler portion is rotatably connected to the slider, so that the ruler portion can be rotated to a folded state parallel to and overlapping with the main ruler, and an extended open state vertically perpendicular to the main ruler.

[0036] Among them, as a possible implementation method of the rotation connection between the ruler and the slider, Figure 1 As shown, the bottom end of the ruler is provided with a connecting rod, the end of the connecting rod is provided with a ball head, and the radial dimension of the ball head is larger than the radial dimension of the connecting rod; accordingly, as shown Figure 2 and Figure 3As shown, the top surface of the slider is provided with a first slide groove and a second slide groove that are connected. The shape of the first slide groove is adapted to the connecting rod, and extends to one side of the slider in the sliding direction of the main scale to form a first opening; the second slide groove includes a lower slide groove whose shape is adapted to the ball head and an upper slide groove adapted to the connecting rod, and the second slide groove extends to one side of the slider in a direction perpendicular to the main scale to form a second opening; a secondary scale slide groove is provided on one side of the slider where the second opening is located in the vertical direction, and the secondary scale slide groove is located on the side where the first reference scale is extended and opened, and the second opening is located on the bottom surface of the secondary scale slide groove.

[0037] Based on the above-mentioned slider structure, the ruler is erected and passes through the second opening so that the connecting rod and the ball head at the bottom of the ruler slide through the second slide groove to the connecting end with the first slide groove, and then the ruler is rotated from the upright state to the horizontal state where it overlaps with the main ruler through the first slide groove and the first opening structure, and the problem of the ruler being separated from the slider is avoided during the rotation process, thereby ensuring that medical staff can smoothly operate the rotation of the secondary ruler when measuring the shoulder imbalance angle; when it is necessary to measure the shoulder imbalance height, the ruler can first be rotated upward along the first slide groove to the upright state. The second reference ruler is moved along the second guide slot through the second opening, and the upright ruler portion is slid into the auxiliary ruler slot, thereby sliding the ruler portion up and down along the auxiliary ruler slot or moving the second reference ruler along the guide slot so that the second reference ruler rests against the shoulder of the patient to be measured, thereby achieving shoulder imbalance height measurement; therefore, the structural design of the slider and the ruler portion not only conveniently and quickly achieves the rotational connection assembly of the ruler portion and the slider, but also achieves the functional conversion of the auxiliary ruler between shoulder imbalance height measurement and shoulder imbalance angle measurement, and facilitates medical staff to perform corresponding operations according to measurement requirements.

[0038] Preferably, the secondary scale slot of the slider is exposed to the main scale, that is, Figure 1 The auxiliary ruler slot shown corresponds to the area outside the main ruler, thereby avoiding the main ruler from blocking the auxiliary ruler slot. On the one hand, by sliding up and down along the auxiliary ruler slot, the second reference ruler can be satisfied with the measurement requirement of the shoulder of the patient to be measured, making the measurement operation simpler and more convenient. On the other hand, when the ruler part is fixed on the auxiliary ruler slot and the second reference ruler needs to be slid up and down along the ruler part to press against the shoulder of the patient to be measured, the ruler part fixed on the auxiliary ruler slot can be made into a "cross" orthogonal state with the main ruler, so that the second reference ruler can be applied to various situations such as the left shoulder is higher and the right shoulder is lower, and the left shoulder is lower and the right shoulder is higher, thereby avoiding the operation of swapping the positions of the first reference ruler and the second reference ruler when encountering different situations, especially when the patient's shoulder imbalance is not obvious and the height of the left and right shoulders cannot be roughly judged by naked eye observation.

[0039] It is easy to understand that the side walls of the secondary ruler chute can be provided with a tightening bolt, so that by loosening the tightening bolt, the ruler portion can be loosened to enable the ruler portion to slide along the secondary ruler chute, and by tightening the tightening bolt, the ruler portion can be tightened and fixed in the secondary ruler chute. Specifically, the secondary ruler chute can be a "T"-shaped chute, and the cross-section of the secondary ruler is a "convex" shape that adapts to the "T"-shaped chute. The convex portion of the secondary ruler is located outside the secondary ruler chute, and the second reference ruler is slidably mounted on the convex portion of the secondary ruler via a second guide hole structure extending along the length of the secondary ruler. This not only enables the sliding movement of the second reference ruler, but also helps reduce the weight of the secondary ruler.

[0040] When measuring the shoulder imbalance angle, in order to ensure the accuracy of the measurement results, it is required that the bottom surfaces of the first reference ruler and the second reference ruler are initially located at the same level; in this regard, as an implementable embodiment, the second reference ruler is connected to one end of the adjusting bolt, and the other end of the adjusting bolt passes through the first adjusting nut and the second guide hole in sequence and cooperates with the second adjusting nut, so that the exposed length of the adjusting bolt on the side where the second reference ruler is located can be adjusted by adjusting the position of the first adjusting nut and the second adjusting nut, thereby adjusting the coplanarity of the bottom surfaces of the first reference ruler and the second reference ruler.

[0041] Of course, other possible implementations, such as Figure 4 As shown, the second reference ruler can also be connected to one end of the fastening bolt through a telescopic structure, and the other end of the fastening bolt passes through the second guide hole and cooperates with the fastening nut, so that the horizontal height of the second reference ruler can be adjusted by the telescopic structure. The telescopic structure can adopt an existing sleeve-type telescopic rod structure, etc., and the corresponding fastening bolt is a hollow tubular structure that cooperates with it; compared with the above-mentioned structure of the adjusting bolt and the adjusting nut, when the second reference ruler is retracted to a position close to the secondary ruler, it can avoid that the bolt part is exposed too long to cause a safety hazard.

[0042] In the device for measuring shoulder imbalance disclosed in this embodiment, corresponding length scales are usually set on both the main ruler and the secondary ruler, and the unit scale length can be millimeters, which is conducive to medical personnel to accurately and quickly adjust and confirm the horizontal position and corresponding height of the first reference ruler and the second reference ruler; at the same time, an angle scale is set on the side of the slider away from the secondary ruler slide, and the zero line of the angle scale is parallel to the main ruler and is located at the center of the lower groove of the second slide, so that when measuring the shoulder imbalance angle, the angle between the ruler part of the secondary ruler and the main ruler can be accurately and quickly confirmed through the angle scale.

[0043] It should be noted that in order to facilitate medical staff to quickly and accurately observe and read the length scales of the first and second reference rulers corresponding to the main ruler, as well as the angle scales of the secondary ruler, the slider is preferably a structural member made of a transparent material. The zero mark position of the main ruler length scale can be marked in the middle of the main ruler, and the other length marks are on both sides of the zero mark. For example, the length of the main ruler can be designed to be 60 cm, with the middle position of the main ruler marked as "0 cm", and the two sides marked as "1 cm, 2 cm, 3 cm, 4 cm, 5 cm ... 30 cm" respectively; the zero mark position of the secondary ruler length scale is marked at one end of the ruler; at the same time, a bubble level can be set at the zero mark position of the main ruler, so that medical staff can confirm the horizontal state of the main ruler during measurement.

[0044] In this embodiment, in order to enable the folded and retracted secondary ruler to fit closely with the main ruler when idle, thereby avoiding damage to the device due to external forces such as squeezing by heavy objects, the convex structure of the secondary ruler is preferably made of a square structure, and the connecting rod and ball head structure at the bottom end of the secondary ruler are located at the center of the square structure, so that the rotation center of the connecting rod and the ball head is at an equal distance from the back and side of the convex structure of the secondary ruler.

[0045] In adopting Figure 4 After measuring the shoulder imbalance angle, you can first turn the secondary ruler to an upright position, and then rotate the secondary ruler so that the wider back of the convex secondary ruler faces the side of the main ruler. Figure 5 The wider back of the secondary ruler can be rotated to fit the main ruler and folded back, ensuring the overall structural strength of the device after folding and retracting.

[0046] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0047] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims of the present invention.

Claims

1. A device for measuring shoulder imbalance, characterized in that: The invention comprises a main ruler, a sub-ruler, a first reference ruler, and a second reference ruler; the first reference ruler and the sub-ruler are both slidably mounted on the main ruler, and each has a first state in which they are folded and retracted with the main ruler, and a second state in which they are extended and unfolded, and the sliding directions of the first reference ruler and the sub-ruler are opposite to or opposite to each other along the length direction of the main ruler; the second reference ruler is slidably mounted on the sub-ruler, and has a first state in which they are folded and retracted with the sub-ruler, and a second state in which they are extended and unfolded; When the second reference ruler, the first reference ruler and the secondary ruler are all in the second extended and opened state, the first reference ruler, the main ruler and the secondary ruler are perpendicular to each other, the first reference ruler and the second reference ruler are parallel and located on the same side of the main ruler; the main ruler is provided with a spirit level for observing and confirming the horizontal state of the main ruler.

2. The device for measuring shoulder imbalance according to claim 1, characterized in that The bottom surface of the main ruler is provided with a groove extending along the length direction of the main ruler, and one side of the groove passes through one side surface of the main ruler, and the main ruler forms a travel range with a "┏"-shaped cross-section; the first reference ruler includes a sliding part and a cross bar, the sliding part is slidably arranged in the groove, and one end of the cross bar is rotatably connected to the sliding part, so that the cross bar is rotated to a first state in which it is folded and retracted in the groove and a second state in which it is extended and opened horizontally and perpendicularly to the main ruler.

3. The device for measuring shoulder imbalance according to claim 2, characterized in that: A first guide hole is provided at the back of the travel range of the main scale along the length extension direction of the main scale; the sliding part is provided with a first guide screw that slides with the first guide hole, the first guide screw passes through the first guide hole, and is connected to the first fastening nut through a threaded structure.

4. The device for measuring shoulder imbalance according to any one of claims 1 to 3, characterized in that: The secondary ruler includes a slider and a ruler portion; the slider is provided with a "T"-shaped slide groove, and is slidably embraced on the main ruler through the "T"-shaped slide groove; the ruler portion is rotatably connected to the slider, and is used for the ruler portion to rotate to a first state in which it is parallel to and overlaps with the main ruler and is folded and retracted, and a second state in which it is vertically perpendicular to the main ruler and is stretched and opened.

5. The device for measuring shoulder imbalance according to claim 4, characterized in that: A connecting rod is provided at the bottom end of the ruler part, and a ball head is provided at the end of the connecting rod, and the radial size of the ball head is larger than the radial size of the connecting rod; a first slide groove and a second slide groove are provided on the top surface of the slider, the shape of the first slide groove is adapted to the connecting rod, and extends to one side side of the slider in the sliding direction of the main ruler to form a first opening; the second slide groove includes a lower slide groove whose shape is adapted to the ball head and an upper slide groove adapted to the connecting rod, and the second slide groove extends to one side side of the slider in a direction perpendicular to the main ruler to form a second opening; a secondary scale slide groove is provided on one side side of the slider where the second opening is located in the vertical direction, and the secondary scale slide groove is located on the side where the first reference ruler is stretched and opened, and is exposed to the main ruler; the second opening is located on the bottom surface of the secondary scale slide groove.

6. The device for measuring shoulder imbalance according to claim 5, characterized in that: The slider is a structural member made of transparent material; the scale surfaces of the main ruler and the secondary ruler are both provided with length scales distributed along the length direction, and the middle position of the length scale of the main ruler is marked as the zero mark position, and one end of the length scale of the secondary ruler is marked as the zero mark position.

7. The device for measuring shoulder imbalance according to claim 6, characterized in that: An angle scale is provided on the side surface of the slider away from the secondary scale slot, and the zero line of the angle scale is parallel to the main scale and is located at the center of the lower slot of the second slot; when the secondary scale is in a folded and retracted state, the bottom surface of the second reference scale in the extended and opened state is located in the same plane as the bottom surface of the first reference scale, and the rotating surface of the secondary scale that is extended and opened around the second slot along the first slot through the ball head is perpendicular to the plane where the main scale is located.

8. The device for measuring shoulder imbalance according to claim 7, characterized in that: The secondary ruler slide groove is a "T"-shaped slide groove, the cross-sectional shape of the secondary ruler is a "convex" shape adapted to the "T"-shaped slide groove, and the side wall of the secondary ruler slide groove is provided with a tightening bolt for fixing the secondary ruler; the second reference ruler is slidably set on the convex part of the secondary ruler, and the convex part of the secondary ruler is located outside the secondary ruler slide groove.

9. The device for measuring shoulder imbalance according to claim 8, characterized in that A second guide hole extending along the length direction is provided on the side of the convex portion of the secondary ruler; the second reference ruler is connected to one end of the adjusting bolt, and the other end of the adjusting bolt passes through the first adjusting nut and the second guide hole in sequence and cooperates with the second adjusting nut; or, the second reference ruler is connected to one end of the fastening bolt through a telescopic structure, and the other end of the fastening bolt passes through the second guide hole and cooperates with the fastening nut.

10. The device for measuring shoulder imbalance according to claim 8, characterized in that The "convex" structure of the secondary ruler is a structural member made of a square structure, and the connecting pipe and the ball head are located at the center of the square.

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