A leg circumference measuring tool

Abstract

The present invention discloses a leg circumference measuring tool, which relates to the technical field of medical devices, and comprises a base, wherein the outer wall of the base is provided with a slide groove, and the inner wall of the base slide groove is provided with a slide cavity, and the inner wall of the slide groove of the base is slidably installed with a connecting plate. The invention arranges a positioning device, and when it is necessary to measure the leg circumference of a patient, the Velcro strip is untied, and the patient's leg is passed through a circumference scale. After the patient lies flat, the Velcro strip is passed through a placement half ring, and the corresponding hole of the knee on the positioning plate is aligned with the patient's knee. The Velcro strip is tightened and attached to the hooked fiber on the back of the Velcro strip. The soft pad provides additional support and comfort for the joint of the patient's knee, which helps to reduce the discomfort that the patient may feel due to maintaining the same posture for a long time. The arrangement of the positioning plate can also ensure that the patient's knee maintains the correct position and alignment during the measurement process, thereby improving the accuracy and reliability of the measurement.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a leg circumference measuring tool. Background Art

[0002] After orthopedic surgery, there is a 10% to 17% probability of developing deep vein thrombosis in the lower limbs. Patients have obvious symptoms, including swelling of the lower limbs, local deep tenderness and dorsiflexion pain. Currently, clinical practice generally measures the patient's leg circumference daily to determine whether the legs are swollen. If leg swelling is found, the patient needs to be encouraged to actively move his feet and toes frequently, and ask him to take deep breaths and cough more often; let the patient get out of bed and move as soon as possible, and wear medical elastic stockings when necessary to avoid the formation of deep vein thrombosis in the lower limbs. When measuring the leg circumference, the thigh is generally measured at 10 cm with the knee as the midpoint, and the calf is measured at 15 cm.

[0003] Patent announcement number CN218105890U discloses a leg circumference measuring device, which provides a leg circumference measuring device, including a patellar fixing plate, a long rod, a short rod, and two leg circumference measuring circles. The patellar fixing plate is provided with a hemispherical depression, and the patellar fixing plate is used to be fixed on the patella of the patient to be measured; the long rod is connected to the upper side of the patellar fixing plate, and one of the two leg circumference measuring circles is installed on the top of the long rod; the short rod is connected to the lower side of the patellar fixing plate, and the other of the two leg circumference measuring circles is installed on the bottom of the short rod. The leg circumference measuring device provided by the patent fixes the patellar fixing plate at the patient's patella position, and the leg circumference measuring circle installed on the long rod can measure the leg circumference of the patient's thigh, and the leg circumference measuring circle installed on the short rod can measure the leg circumference of the patient's calf. That is, by fixing the patellar fixing plate to the patient's patella position, the leg circumference of the patient's thigh and calf can be measured, thereby improving the efficiency of measuring the patient's leg circumference. In the above patent, however, the current leg circumference measuring device has the following problems: the positioning of the device on the knee is not stable, and the adjustment rod of the device is not conducive to folding, so that when the measuring device is placed, the measuring device occupies a large area and is not easy to fold. Therefore, we propose a leg circumference measuring tool. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a leg circumference measuring tool to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: a leg circumference measuring tool, including a base, the outer wall of the base is provided with a slide groove, and the inner wall of the base slide groove is provided with a slide cavity, a connecting plate is slidably installed on the inner wall of the slide groove of the base, a circumference scale is fixedly installed on the side wall of the base, a fixing plate is fixedly installed on the outer wall of the circumference scale, a fixing shaft is fixedly installed on the inner wall of the fixing plate, and a sliding hole is provided inside the fixed shaft, a rotating shaft is hinged on the outer wall of the fixed shaft, a circumference ruler is fixedly installed on the top of the circumference scale, and the end of the circumference ruler away from the circumference scale is fixedly installed on the rotating shaft The outer wall of the shaft, a positioning device is provided on the side opposite to the base, and a ruler-retracting device is provided on the outer wall of the circumference scale. The positioning device includes a fixed seat, a placing half ring, a cushion, a connecting strip, a positioning plate and a Velcro strip. The fixed seat passes through and is fixedly installed on the outer wall of the middle end of the connecting plate. The placing half ring is fixedly installed on the top of the fixed seat, the cushion is fixedly installed on the top of the placing half ring, the connecting strip is rotatably installed on the top of the placing half ring away from the circumference scale, the positioning plate is fixedly installed on the top of the connecting strip close to the circumference scale, and the Velcro strip is fixedly installed on the outer wall of the positioning plate close to the circumference scale.

[0006] According to the above technical solution, the soft pad is made of rubber material, and the surface of the positioning plate is provided with holes corresponding to the knees.

[0007] According to the above technical scheme, the positioning device also includes an inner plate, a rotating block, an outer plate, a square frame, a resistance rod, a resistance ball and a resistance ball. The inner plate is fixedly installed at both ends of the connecting plate, the rotating block is rotatably installed on the outer wall of the inner plate away from the connecting plate, the outer plate is fixedly installed on one end of the rotating block away from the connecting plate, the square frame is slidably installed on the outer walls of the inner plate and the outer plate, the resistance rod is fixedly installed on the outer wall of the square frame away from the top of the connecting plate, the resistance ball is fixedly installed on the outer wall of the square frame, and the resistance ball is fixedly installed on the inner wall of the base slide groove.

[0008] According to the above technical solution, the number of the inner covering plates is several, the number of the outer covering plates is several, the resistance ball is flexibly arranged, and the resistance ball is located on the movement trajectory of the resistance ball.

[0009] According to the above technical solution, the ruler retracting device includes a barbell-type sliding column, a fixed plate, a spring, an L-shaped connecting rod, a short rod, a clamping block, a clamping groove and a torsion spring. The barbell-type sliding column is slidably installed on the inner wall of the sliding hole of the fixed shaft, the fixed plate is fixedly installed on the inner wall of the sliding hole of the fixed shaft close to the ball, the spring is fixedly installed on the outer wall of the fixed plate, the L-shaped connecting rod is fixedly installed on one end of the barbell-type sliding column close to the ball, the short rod is fixedly installed on one end of the L-shaped connecting rod away from the barbell-type sliding column, the clamping block is rotatably installed on the outer wall of the short rod, the clamping groove is opened on the outer wall of the circumference ruler close to the base, and the torsion spring is arranged between the short rod and the clamping block.

[0010] According to the above technical solution, the shape of the barbell slide is an I-shape, the spring contacts the inner wall of the barbell slide, the slot is arranged in a right triangle, and the slot is located on the movement trajectory of the block.

[0011] According to the above technical solution, the ruler retracting device also includes a long rod, a contact plate, a semi-toothed ring, a limiting groove and a clamping rod. The long rod is slidably mounted on the inner wall of the sliding cavity of the base, the contact plate is fixedly mounted on one end of the long rod close to the base, the semi-toothed ring is rotatably mounted on the outer wall of the fixed plate, the limiting groove is opened at one end of the barbell-type sliding column close to the outer wall of the fixed plate, and the clamping rod is fixedly mounted on the outer wall of the semi-toothed ring.

[0012] According to the above technical solution, a tooth block is provided at the top of the long rod near one end of the barbell-type sliding column, the outer wall of the contact plate is provided with an arc surface, and the arc surface of the contact plate is located on the movement trajectory of the contact ball, the semi-tooth ring is engaged with the tooth block of the long rod, and the clamping rod is slidably installed on the inner wall of the limiting groove.

[0013] The present invention provides a leg circumference measuring tool having the following beneficial effects: (1) The invention provides a positioning device. When it is necessary to measure the patient's leg circumference, the Velcro strip is untied and the patient's leg is passed through the circumference scale. After the patient lies flat, the Velcro strip is passed through the placement half ring, the corresponding hole of the knee on the positioning plate is aligned with the patient's knee, the Velcro strip is tightened, and it is attached to the hook fiber on the back of the Velcro strip. The soft pad provides additional support and comfort for the joint of the patient's knee, which helps to alleviate the discomfort that the patient may feel due to maintaining the same posture for a long time. The setting of the positioning plate can also ensure that the patient's knee maintains the correct position and alignment during the measurement process, thereby improving the accuracy and reliability of the measurement, so that the resistance ball is reset, and the resistance ball drives the square frame to reset. At this time, the outer plate can drive the rotating block to rotate on the outer wall of the inner plate, which is convenient for the storage and carrying of the circumference scale, making the entire measurement process more convenient and efficient. The square frame can ensure that the two circumference scales maintain a stable position during the measurement process and will not be displaced due to external forces.

[0014] (2) The invention provides a ruler-retracting device so that the circumference ruler can be rolled up to the outer wall of the rotating shaft, thereby achieving the effect of tightening the patient's legs. The patient's leg circumference is measured and the data is displayed on the circumference meter. After tightening, the barbell slide is released, and the spring releases the squeezing of the fixed plate and the barbell slide, so that the spring releases the elastic force to reset the barbell slide, and the clamping block is re-locked in the clamping groove on the circumference ruler to prevent excessive tightening. The setting of the clamping block makes the patient more comfortable during use and the operation of the medical staff more convenient. At the same time, the circumference ruler can be quickly rolled up, thereby achieving the effect of fast measurement. The resistance plate drives the long rod to slide outward, and the tooth block of the long rod engages with the semi-toothed ring, so that the semi-toothed ring drives the clamping rod to rotate. After the clamping rod moves to the top, the clamping rod releases the restriction of the restriction groove, so that the barbell slide can be used normally. Through such a limit operation, it is ensured that the circumference ruler will not be rolled up when not in use, avoiding equipment damage caused by misoperation, thereby improving the reliability of the equipment and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the overall structure of the present invention; Figure 2 It is a bottom view schematic diagram of the overall structure of the present invention; Figure 3 It is a cross-sectional schematic diagram of the overall structure of the present invention; Figure 4 is a cross-sectional schematic diagram of a positioning device of the present invention; Figure 5 It is an enlarged schematic diagram of the structure at A of the present invention; Figure 6 It is a cross-sectional schematic diagram of the ruler retracting device of the present invention; Figure 7 It is an enlarged schematic diagram of the structure at B of the present invention; Figure 8 It is an enlarged schematic diagram of the structure at location C of the present invention.

[0016] In the figure: 1. base; 101. connecting plate; 11. circumference gauge; 12. fixing plate; 13. fixing shaft; 14. rotating shaft; 15. circumference ruler; 2. positioning device; 21. fixing seat; 22. placing half ring; 2201. cushion; 23. connecting strip; 24. positioning plate; 25. Velcro strip; 26. inner plate; 27. rotating block; 28. outer plate; 29. ​​square frame; 210. resistance rod; 211. resistance ball; 212. resistance ball; 3. ruler retracting device; 31. barbell sliding column; 32. fixing plate; 33. spring; 34. L-shaped connecting rod; 35. short rod; 36. clamping block; 37. clamping groove; 38. torsion spring; 39. long rod; 310. resistance plate; 311. half tooth ring; 312. limiting groove; 313. clamping rod. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 5 One embodiment of the present invention is: a leg circumference measuring tool, comprising a base 1, an outer wall of the base 1 is provided with a slide groove, and the inner wall of the slide groove of the base 1 is provided with a slide cavity, a connecting plate 101 is slidably installed on the inner wall of the slide groove of the base 1, a circumference gauge 11 is fixedly installed on the side wall of the base 1, a fixing plate 12 is fixedly installed on the outer wall of the circumference gauge 11, a fixing shaft 13 is fixedly installed on the inner wall of the fixing plate 12, and a sliding hole is provided inside the fixing shaft 13, a rotating shaft 14 is hinged on the outer wall of the fixing shaft 13, and the top of the circumference gauge 11 is fixedly installed on the side wall of the base 1 A circumference ruler 15 is fixedly installed, and one end of the circumference ruler 15 away from the circumference scale 11 is fixedly installed on the outer wall of the rotating shaft 14. A positioning device 2 is arranged on the opposite side of the base 1. A ruler collection device 3 is arranged on the outer wall of the circumference scale 11. The positioning device 2 includes a fixing seat 21, a placing half ring 22, a cushion 2201, a connecting strip 23, a positioning plate 24 and a Velcro strip 25. The fixing seat 21 passes through and is fixedly installed on the outer wall of the middle end of the connecting plate 101. The placing half ring 22 is fixedly installed on the top of the fixing seat 21. The cushion 220 1 is fixedly installed on the top of the placing semi-ring 22, the soft pad 2201 is made of rubber, the connecting strip 23 is rotatably installed on the top of the placing semi-ring 22 away from the circumference scale 11, the positioning plate 24 is fixedly installed on the top of the connecting strip 23 close to the circumference scale 11, and the surface of the positioning plate 24 is provided with a knee corresponding hole, and the Velcro strip 25 is fixedly installed on the outer wall of the positioning plate 24 close to the circumference scale 11. When it is necessary to measure the leg circumference of the patient, the Velcro strip 25 is untied, and the patient's leg is passed through the circumference scale 11. After the patient lies flat, the Velcro strip 25 is passed through the placing semi-ring 22, and the knee corresponding hole on the positioning plate 24 is aligned with the patient's knee, and the Velcro strip 25 is tightened and attached to the hook fiber on the back of the Velcro strip 25. The soft pad 2201 provides additional support and comfort for the joint of the patient's knee, which helps to reduce the discomfort that the patient may feel due to maintaining the same posture for a long time. The setting of the positioning plate 24 can also ensure that the patient's knee maintains the correct position and alignment during the measurement process, thereby improving the accuracy and reliability of the measurement.

[0019] The positioning device 2 also includes an inner package plate 26, a rotating block 27, an outer package plate 28, a square frame 29, a contact rod 210, a contact ball 211 and a contact ball 212. The inner package plate 26 is fixedly mounted on both ends of the connecting plate 101. The number of the inner package plates 26 is several. The rotating block 27 is rotatably mounted on the outer wall of the inner package plate 26 away from the connecting plate 101. The outer package plate 28 is fixedly mounted on one end of the rotating block 27 away from the connecting plate 101. The number of the outer package plates 28 is several. The square frame 29 is slidably mounted on the outer walls of the inner package plate 26 and the outer package plate 28. The resistance rod 210 is fixedly mounted on the outer wall of the square frame 29 away from the top of the connecting plate 101, the resistance ball 211 is fixedly mounted on the outer wall of the square frame 29, the resistance ball 211 is flexibly set, the resistance ball 212 is fixedly mounted in the inner part of the slide groove of the base 1, and the resistance ball 212 is located on the upper wall of the movement track of the resistance ball 211. When the patient's knee is positioned, the base 1 is pulled to both sides, and the base 1 drives the circumference meter 11 to move to both sides on the outer wall of the connecting plate 101, and the circumference meter 11 drives the resistance ball 212 to move to both sides, and the resistance ball 212 The square frame 29 is stuck between the outer walls of the inner and outer panels 26 and 28, preventing the rotating block 27 from driving the outer panels 28 to rotate. The sticking rod 210 on the square frame 29 is stuck to the front end of the square frame 29, so that the remaining square frames 29 are stuck between the outer walls of the inner and outer panels 26 and 28. After the two circumference gauges 11 are moved to the top, the distances between the two circumference gauges 11 and the fixing seat 21 are ten centimeters and fifteen centimeters, respectively. After the measurement is completed, the circumference gauge 11 is reset, and the circumference gauge 11 drives the ball 212 to reset. The ball 212 contacts the contact ball 211, so that the contact ball 211 is reset, and the contact ball 211 drives the square frame 29 to reset. At this time, the outer plate 28 can drive the rotating block 27 to rotate on the outer wall of the inner plate 26, which facilitates the storage and carrying of the circumference gauge 11 and makes the entire measurement process more convenient and efficient. The square frame 29 can ensure that the two circumference gauges 11 maintain a stable position during the measurement process and will not be displaced due to external forces.

[0020] When this embodiment is working, when it is necessary to measure the patient's leg circumference, untie the Velcro strip 25, pass the patient's legs through the circumference scale 11, and after the patient lies flat, pass the Velcro strip 25 through the placement half ring 22, align the corresponding hole of the knee on the positioning plate 24 with the patient's knee, tighten the Velcro strip 25, and stick it to the hook fiber on the back of the Velcro strip 25. The cushion 2201 provides additional support and comfort for the joint of the patient's knee, which helps to reduce the discomfort that the patient may feel due to maintaining the same posture for a long time. The setting of the positioning plate 24 can also ensure that the patient's knee maintains the correct position and alignment during the measurement process, thereby improving the accuracy and reliability of the measurement.

[0021] When the patient's knee is positioned, the base 1 is pulled to both sides, and the base 1 drives the circumference gauge 11 to move to both sides on the outer wall of the connecting plate 101, and the circumference gauge 11 drives the balls 212 to move to both sides, and the balls 212 abut against the abutment balls 211, so that the abutment balls 211 drive the square frame 29 to move to both sides, and the square frame 29 will be stuck between the outer walls of the inner and outer panels 26, 28, to prevent the rotating block 27 from driving the outer panel 28 to rotate, and the abutment rod 210 on the square frame 29 will abut against the front end square frame 29, so that the remaining square frames 29 are stuck between the outer walls of the inner and outer panels 26, 28, and the two circumference gauges 11 are moved. After reaching the top, the two circumference gauges 11 are respectively ten centimeters and fifteen centimeters away from the fixed seat 21. After the measurement is completed, the circumference gauge 11 is reset, and the circumference gauge 11 drives the ball 212 to reset. The ball 212 contacts the contact ball 211, so that the contact ball 211 is reset, and the contact ball 211 drives the square frame 29 to reset. At this time, the outer plate 28 can drive the rotating block 27 to rotate on the outer wall of the inner plate 26, which facilitates the storage and carrying of the circumference gauge 11, making the entire measurement process more convenient and efficient. The square frame 29 can ensure that the two circumference gauges 11 maintain a stable position during the measurement process and will not be displaced due to external forces.

[0022] See also Figure 6-Figure 8On the basis of the above embodiment, in another embodiment of the present invention, the ruler collecting device 3 includes a barbell slide column 31, a fixing plate 32, a spring 33, an L-shaped connecting rod 34, a short rod 35, a clamping block 36, a clamping groove 37 and a torsion spring 38. The barbell slide column 31 is slidably installed on the inner wall of the sliding hole of the fixed shaft 13. The shape of the barbell slide column 31 is an I-shape. The circumference ruler 15 is pulled upward to ensure that the patient's legs can be placed on the top of the base 1. After the preparation work is completed, the medical staff presses the barbell slide column 31, and the fixing plate 32 is fixedly installed. The spring 33 is fixedly mounted on the inner wall of the sliding hole of the fixed shaft 13 near the ball 212, the spring 33 is fixedly mounted on the outer wall of the fixed plate 32, the spring 33 contacts the inner wall of the barbell type sliding column 31, the L-shaped connecting rod 34 is fixedly mounted on the end of the barbell type sliding column 31 near the ball 212, the barbell type sliding column 31 drives the L-shaped connecting rod 34 to move to both sides, the short rod 35 is fixedly mounted on the end of the L-shaped connecting rod 34 away from the barbell type sliding column 31, the L-shaped connecting rod 34 drives the short rod 35 to move to both sides, the block 36 is rotatably mounted on the outer wall of the short rod 35, and the short rod 35 The clamping block 36 is driven to move to both sides, and the clamping groove 37 is provided on the outer wall of the circumference ruler 15 close to the base 1. The clamping groove 37 is set in a right triangle, and the clamping groove 37 is located on the movement track of the clamping block 36. The clamping block 36 is separated from the clamping groove 37 on the circumference ruler 15. The torsion spring 38 is set between the short rod 35 and the clamping block 36, so that the circumference ruler 15 releases the torsion of the hinge connection between the fixed shaft 13 and the rotating shaft 14, and the rotating shaft 14 rotates, so that the circumference ruler 15 is rolled up to the outer wall of the rotating shaft 14, thereby achieving the effect of tightening the patient's legs, which is beneficial to the patient. The leg circumference is measured and the data will be displayed on the circumference meter 11. After tightening, the barbell slide column 31 is released, and the spring 33 will release the squeezing of the fixed plate 32 and the barbell slide column 31, so that the spring 33 releases the elastic force to reset the barbell slide column 31, and the clamping block 36 will be clamped on the clamping groove 37 on the circumference ruler 15 again to prevent excessive tightening. The setting of the clamping block 36 makes the patient more comfortable during use and the operation of the medical staff more convenient. At the same time, it also realizes the rapid winding of the circumference ruler 15, thereby achieving the effect of rapid measurement.

[0023] The ruler-collecting device 3 also includes a long rod 39, a contact plate 310, a semi-toothed ring 311, a limiting groove 312 and a clamping rod 313. The long rod 39 is slidably mounted on the inner wall of the sliding cavity of the base 1. A tooth block is arranged on the top of the long rod 39 near one end of the barbell-type sliding column 31. The contact plate 310 is fixedly mounted on the end of the long rod 39 near the base 1. The outer wall of the contact plate 310 is arranged as an arc surface, and the arc surface of the contact plate 310 is located on the movement trajectory of the ball 212. The semi-toothed ring 311 is rotatably mounted on the outer wall of the fixed plate 12. The semi-toothed ring 311 is meshed with the tooth block of the long rod 39. The limiting groove 312 is arranged at one end of the barbell-type sliding column 31 near the outer wall of the fixed plate 12. The clamping rod 313 is fixedly mounted on the outer wall of the semi-toothed ring 311. The clamping rod 313 is slidably mounted on the inner wall of the limiting groove 312. When the circumference gauge 11 is taken, the barbell-type sliding column 31 will The locking plate 310 is pressed against the locking cam 314 to unlock the locking cam 315, and the locking cam 313 is pressed against the locking cam 314 to unlock the locking cam 315.

[0024] When the present embodiment is working, the circumference ruler 15 is pulled upward to ensure that the patient's legs can be placed on the top of the base 1. After the preparation work is completed, the medical staff presses the barbell slide column 31, and the barbell slide column 31 drives the L-shaped connecting rod 34 to move to both sides, and the L-shaped connecting rod 34 drives the short rod 35 to move to both sides, and the short rod 35 drives the clamping block 36 to move to both sides, and the clamping block 36 disengages from the clamping groove 37 on the circumference ruler 15, so that the circumference ruler 15 releases the torsion of the hinge connection between the fixed shaft 13 and the rotating shaft 14, and the rotating shaft 14 rotates, so that the circumference ruler 15 is rolled up to the outer wall of the rotating shaft 14, The effect of tightening the patient's legs is achieved, and the patient's leg circumference is measured. The data will be displayed on the circumference meter 11. After tightening, the barbell slide 31 is released, and the spring 33 will release the squeezing of the fixed plate 32 and the barbell slide 31, so that the spring 33 releases the elastic force to reset the barbell slide 31, and the block 36 will be re-engaged in the slot 37 on the circumference ruler 15 to prevent excessive tightening. The setting of the block 36 makes the patient more comfortable during use and the operation of the medical staff more convenient. At the same time, it also realizes the rapid winding of the circumference ruler 15, thereby achieving the effect of rapid measurement.

[0025] The locking plate 313 of the locking cam 314 is engaged with the locking cam 316 when the locking cam 316 is in the unlocked state.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A leg circumference measuring tool, comprising a base (1), characterized in that: The outer wall of the base (1) is provided with a slide groove, and the inner wall of the slide groove of the base (1) is provided with a slide cavity, the inner wall of the slide groove of the base (1) is slidably mounted with a connecting plate (101), a circumference gauge (11) is fixedly mounted on the side wall of the base (1), a fixing plate (12) is fixedly mounted on the outer wall of the circumference gauge (11), a fixing shaft (13) is fixedly mounted on the inner wall of the fixing plate (12), and a sliding hole is provided inside the fixing shaft (13), the outer wall of the fixing shaft (13) is hinged with a rotating shaft (14), a circumference ruler (15) is fixedly mounted on the top of the circumference gauge (11), and one end of the circumference ruler (15) away from the circumference gauge (11) is fixedly mounted on the outer wall of the rotating shaft (14), a positioning device (2) is provided on the opposite side of the base (1), and the circumference gauge (11) The outer wall of the connecting plate (101) is provided with a ruler-retracting device (3), and the positioning device (2) comprises a fixing seat (21), a placing half ring (22), a soft cushion (2201), a connecting strip (23), a positioning plate (24) and a Velcro strip (25); the fixing seat (21) passes through and is fixedly mounted on the outer wall of the middle end of the connecting plate (101); the placing half ring (22) is fixedly mounted on the top of the fixing seat (21); the soft cushion (2201) is fixedly mounted on the top of the placing half ring (22); the connecting strip (23) is rotatably mounted on the top of the placing half ring (22) away from the circumference gauge (11); the positioning plate (24) is fixedly mounted on the top of the connecting strip (23) close to the circumference gauge (11); and the Velcro strip (25) is fixedly mounted on the outer wall of the positioning plate (24) close to the circumference gauge (11).

2. A leg circumference measuring tool according to claim 1, characterized in that: The soft pad (2201) is made of rubber, and a hole corresponding to the knee is provided on the surface of the positioning plate (24).

3. A leg circumference measuring tool according to claim 2, characterized in that: The positioning device (2) further comprises an inner plate (26), a rotating block (27), an outer plate (28), a square frame (29), a resisting rod (210), a resisting ball (211) and a resisting ball (212); the inner plate (26) is fixedly mounted on both ends of the connecting plate (101); the rotating block (27) is rotatably mounted on an outer wall of the inner plate (26) away from the connecting plate (101); the outer plate (28) is fixedly mounted on an end of the rotating block (27) away from the connecting plate (101); the square frame (29) is slidably mounted on the outer walls of the inner plate (26) and the outer plate (28); the resisting rod (210) is fixedly mounted on an outer wall of the square frame (29) away from the top end of the connecting plate (101); the resisting ball (211) is fixedly mounted on the outer wall of the square frame (29); and the resisting ball (212) is fixedly mounted on the inner wall of the slide groove of the base (1).

4. A leg circumference measuring tool according to claim 3, characterized in that: The number of the inner wrapping plates (26) is several, the number of the outer wrapping plates (28) is several, the abutting ball (211) is flexibly arranged, and the abutting ball (212) is located on the movement track of the abutting ball (211).

5. A leg circumference measuring tool according to claim 4, characterized in that: The ruler retracting device (3) comprises a barbell-type sliding column (31), a fixing plate (32), a spring (33), an L-shaped connecting rod (34), a short rod (35), a clamping block (36), a clamping groove (37) and a torsion spring (38); the barbell-type sliding column (31) is slidably mounted on the inner wall of the sliding hole of the fixed shaft (13); the fixing plate (32) is fixedly mounted on the inner wall of the sliding hole of the fixed shaft (13) near the ball (212); and the spring (33) is fixedly mounted on the fixing plate (32). The L-shaped connecting rod (34) is fixedly mounted on an end of the barbell-type sliding column (31) close to the ball (212), the short rod (35) is fixedly mounted on an end of the L-shaped connecting rod (34) away from the barbell-type sliding column (31), the clamping block (36) is rotatably mounted on the outer wall of the short rod (35), the clamping groove (37) is provided on the outer wall of the circumference ruler (15) close to the base (1), and the torsion spring (38) is arranged between the short rod (35) and the clamping block (36).

6. A leg circumference measuring tool according to claim 5, characterized in that: The barbell-type sliding column (31) is in the shape of an I-beam, the spring (33) contacts the inner wall of the barbell-type sliding column (31), the clamping groove (37) is arranged in the shape of a right triangle, and the clamping groove (37) is located on the movement track of the clamping block (36).

7. A leg circumference measuring tool according to claim 6, characterized in that: The ruler retracting device (3) further comprises a long rod (39), a contact plate (310), a semi-toothed ring (311), a limiting groove (312) and a clamping rod (313); the long rod (39) is slidably mounted on the inner wall of the sliding cavity of the base (1); the contact plate (310) is fixedly mounted on one end of the long rod (39) close to the base (1); the semi-toothed ring (311) is rotatably mounted on the outer wall of the fixed plate (12); the limiting groove (312) is provided at one end of the barbell-type sliding column (31) close to the outer wall of the fixed plate (12); and the clamping rod (313) is fixedly mounted on the outer wall of the semi-toothed ring (311).

8. A leg circumference measuring tool according to claim 7, characterized in that: A tooth block is provided at the top of the long rod (39) near one end of the barbell-type sliding column (31); the outer wall of the contact plate (310) is provided with an arc surface, and the arc surface of the contact plate (310) is located on the movement trajectory of the contact ball (212); the semi-toothed ring (311) is meshed with the tooth block of the long rod (39); and the clamping rod (313) is slidably mounted on the inner wall of the limiting groove (312).

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