Limb muscle strength measurer

Abstract

The invention discloses a limb muscle strength measurer, and belongs to the technical field of muscle strength detection. Comprising a fixing mechanism, a measuring mechanism and a display screen, the fixing mechanism comprises a transverse plate, a first longitudinal plate and a second longitudinal plate are hinged to the two sides of the transverse plate respectively, fixing pieces are arranged on the side faces of the first longitudinal plate and the second longitudinal plate, the measuring mechanism comprises a signal processing box installed on the bottom face of the transverse plate, and a signal processing module is installed in the signal processing box; a detection box is installed on the bottom face of the signal processing box, a strain gauge is arranged in the detection box in a suspended mode and electrically connected with the signal processing module, the bottom face of the detection box communicates with a limiting sleeve, a spring connected with the center of the strain gauge is arranged in the limiting sleeve, and a limiting rod connected with the spring is further arranged in the limiting sleeve in a sliding mode. A limb placement part is clamped to the bottom end of the limiting rod, and the display screen is installed on the outer side of the second longitudinal plate and is in communication connection with the signal processing module; the limb muscle strength measurer can achieve the purpose of accurately measuring the limb muscle strength of a patient.

Description

Technical Field

[0001] This invention relates to the field of muscle strength testing technology, specifically to a limb muscle strength measuring device. Background Technology

[0002] During a physical examination in the neurology department, the patient's limb muscle strength is frequently checked. The commonly used method now is the muscle strength grading system: Grade 0 is complete paralysis with no detectable muscle contraction; Grade 1 shows only detectable muscle contraction but no movement; Grade 2 allows the limb to move parallel to the bed but cannot resist its own weight, i.e., cannot lift off the bed; Grade 3 allows the limb to overcome gravity and lift off the bed, but cannot resist resistance; Grade 4 allows the limb to perform movements against external resistance, but not completely; Grade 5 has normal muscle strength.

[0003] During the examination, the patient is instructed to perform limb extension and contraction movements, while the examiner applies resistance from the opposite direction. The examiner tests the patient's ability to overcome the resistance, compares the results on both sides, and determines the examiner's limb muscle strength level based on the muscle strength grading method described above. Although this method is simple and easy to perform, it is highly subjective. When facing the same patient, different medical staff may measure the same patient with vastly different results, making it difficult to accurately, objectively, and truthfully assess the patient's muscle strength. This makes it difficult to detect changes in the patient's condition in a timely manner. Summary of the Invention

[0004] The purpose of this invention is to provide a limb muscle strength measuring device to solve the problems mentioned in the background art.

[0005] In view of the above problems, the technical solution proposed by the present invention is as follows: The limb muscle strength measuring device includes a fixing mechanism, a measuring mechanism, and a display screen. The fixing mechanism includes a horizontal plate, with a first vertical plate and a second vertical plate hinged to its two sides respectively. Fixing members are provided on the sides of the first and second vertical plates. The measuring mechanism includes a signal processing box installed on the bottom surface of the horizontal plate. A signal processing module is installed inside the signal processing box. A detection box is installed on the bottom surface of the signal processing box. A strain gauge is suspended inside the detection box and electrically connected to the signal processing module. A limiting sleeve is connected to the bottom surface of the detection box. A spring connected to the center of the strain gauge is provided inside the limiting sleeve. A limiting rod connected to the spring also slides inside the limiting sleeve. A limb placement member is engaged at the bottom end of the limiting rod. The display screen is installed on the outside of the second vertical plate and is communicatively connected to the signal processing module.

[0006] Specifically, the spring model is matched with the age of the people to be tested. When it is compressed to its maximum, part of the limiting rod is still exposed on the outside of the limiting sleeve. At the same time, when it is in its natural state, part of the limiting rod is still located inside the limiting sleeve.

[0007] Specifically, before installation, the surface of the spring is cleaned and polished to remove oil, rust and oxide layer. Then, epoxy adhesive is used to bond the spring and strain gauge together at the center.

[0008] As a preferred embodiment of the present invention, the signal processing module includes a signal amplifier, a filter, a potentiometer, an analog-to-digital converter, and a Bluetooth transmitter. A Bluetooth receiver is installed inside the display screen. The signal amplifier, filter, potentiometer, analog-to-digital converter, and Bluetooth transmitter are electrically connected in sequence. The strain gauge is electrically connected to the signal amplifier. The Bluetooth transmitter and the Bluetooth receiver are communicatively connected.

[0009] Specifically, both the signal processing box and the display screen have battery compartments on their sides. The battery compartments contain batteries that are compatible with the signal processing box and the display screen. The batteries power the signal processing module, the display screen, the Bluetooth receiver, and the strain gauges. The battery compartments are also equipped with covers.

[0010] As a preferred embodiment of the present invention, a knob is rotatably connected to the outside of the signal processing box, and the knob is drive-connected to the adjustment terminal of the potentiometer.

[0011] Specifically, the potentiometer, as a variable resistor, is used to adjust the output voltage corresponding to the zero point. When performing zero-point calibration, the resistance value of the potentiometer is changed by rotating the knob, thereby changing the voltage division in the circuit and making the displayed reading zero.

[0012] As a preferred embodiment of the present invention, the limb placement component includes an arc-shaped top plate, a hanging ring is installed at the center of the top surface of the arc-shaped top plate, a hook is installed at the bottom end of the limiting rod, the hook and the hanging ring are engaged, four sets of rivets are installed on the top surface of the arc-shaped top plate, and elastic bands are connected between the opposing rivets.

[0013] As a preferred embodiment of the present invention, a pair of fixing strips are installed at each of the four corners of the detection box, and the four corners of the strain gauge are clamped by the four pairs of fixing strips.

[0014] As a preferred embodiment of the present invention, a through hole is provided at the center of the top surface of the horizontal plate, and a sliding hole is provided at the center of the bottom surface of the horizontal plate. The through hole and the sliding hole are connected. A threaded sleeve is installed at the center of the top surface of the signal processing box. The threaded sleeve slides in the sliding hole. A screw slides inside the through hole, and the screw and the threaded sleeve are threadedly engaged.

[0015] As a preferred embodiment of the present invention, the sides of the first longitudinal plate and the second longitudinal plate are provided with grooves near their respective bottom surfaces. A square rod is installed inside the groove, and a pressure plate that slides in the groove is fitted on the outside of the square rod. Bolts are threadedly connected to the bottom surfaces of the first longitudinal plate and the second longitudinal plate, and the bolts press against the bottom surface of the pressure plate.

[0016] Specifically, the groove can engage with the footrest or side armrest of the hospital bed, and the groove can also engage with the edge of the chair seat. By rotating the bolt, the pressure plate is squeezed, so that the pressure plate squeezes the edge of the footrest or side armrest of the hospital bed or the edge of the chair seat, thereby fixing the device to the hospital bed or chair. At the same time, the square rod makes it impossible for the pressure plate to disengage from the groove, and it can only move up and down within the groove.

[0017] As a preferred embodiment of the present invention, the bottom surface of the horizontal plate is provided with connecting grooves on both sides, and the first L-shaped block and the second L-shaped block are rotatably connected inside the connecting grooves respectively. The free ends of the first L-shaped block and the second L-shaped block are respectively connected to the first vertical plate and the second vertical plate. The first vertical plate and the horizontal plate are attracted to each other, and the second vertical plate and the first vertical plate are attracted to each other.

[0018] Specifically, both the first L-shaped block and the second L-shaped block are composed of two strip blocks, with the included angle between the two strip blocks being 90 degrees. One strip block is connected to the connecting groove by a pin, while the other strip block is connected to either the first or second longitudinal plate. The length of the strip block in the first L-shaped block that is connected to the first longitudinal plate is less than the length of the strip block in the second L-shaped block that is connected to the second longitudinal plate, so that the second longitudinal plate can fit against the side of the first longitudinal plate. At the same time, the lengths of both the first and second longitudinal plates are less than the shortest distance between a pair of connecting grooves.

[0019] Specifically, an iron sheet is embedded on the bottom side of the horizontal plate, a magnet is embedded on the inner side of the first vertical plate and an iron sheet is embedded on the outer side, and a magnet is embedded on the inner side of the second vertical plate. Using the magnet and the iron sheet, the first vertical plate is rotated first to make it adhere to the horizontal plate, and then the second vertical plate is rotated to make it adhere to the first vertical plate.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. This limb muscle strength measuring device directly digitizes, refines, and visualizes muscle strength data, avoiding objective human influence, and can detect subtle changes in muscle strength more promptly, thus buying time for patients with cerebrovascular diseases. 2. The equipment is small in size, making it easy to store and retrieve, and measurements can be taken at any time; 3. Patients can perform muscle strength measurements while lying in bed or sitting in a chair, and the device has low environmental requirements; 4. It can be used as a self-rehabilitation testing device for the elderly. The elderly can take measurements at home with the help of family members, or like public fitness equipment, they can take measurements in public places with low traffic such as parks with the help of community staff. Therefore, it is beneficial for the elderly to discover subtle changes in their nervous system in a timely manner. Attached Figure Description

[0021] Figure 1 This is a first three-dimensional structural schematic diagram of the limb muscle strength measuring device disclosed in an embodiment of the present invention; Figure 2 This is a second three-dimensional structural schematic diagram and an exploded structural schematic diagram of the limb muscle strength measuring device disclosed in an embodiment of the present invention; Figure 3 This is an exploded structural diagram of the limb muscle strength measuring device disclosed in an embodiment of the present invention; Figure 4 This is a partial cross-sectional structural diagram of the limb muscle strength measuring device disclosed in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the limb muscle strength measuring device disclosed in an embodiment of the present invention after folding. Figure 6 This is a system block diagram of the limb muscle strength measuring device disclosed in an embodiment of the present invention.

[0022] In the diagram: 100, Fixing mechanism; 1001, Horizontal plate; 1002, Connecting groove; 1003, First L-shaped block; 1004, Second L-shaped block; 1005, First vertical plate; 1006, Second vertical plate; 1007, Groove; 1008, Square rod; 1009, Pressure plate; 1010, Bolt; 1011, Screw; 1012, Through hole; 1013, Threaded sleeve; 200, Measuring mechanism; 2001, Signal processing box; 2002, Knob; 2003, Detection box; 2004, Fixing strip; 2005, Strain gauge; 2006, Limiting sleeve; 2007, Spring; 2008, Limiting rod; 2009, Hook; 2010, Arc-shaped top plate; 2011, Hanging ring; 2012, Elastic band; 300, Display screen. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1 - Figure 6This invention provides a technical solution: a limb muscle strength measuring device, including a fixing mechanism 100, a measuring mechanism 200, and a display screen 300. The fixing mechanism 100 includes a horizontal plate 1001, with a first vertical plate 1005 and a second vertical plate 1006 hinged to both sides of the horizontal plate 1001 respectively. Fixing members are provided on the sides of the first vertical plate 1005 and the second vertical plate 1006. The measuring mechanism 200 includes a signal processing box 2001 installed on the bottom surface of the horizontal plate 1001. A signal processing module is installed inside the signal processing box 2001. A detection box 2003 is installed, and a strain gauge 2005 is suspended inside the detection box 2003 and electrically connected to the signal processing module. The bottom surface of the detection box 2003 is connected to a limiting sleeve 2006. The limiting sleeve 2006 has a spring 2007 connected to the center of the strain gauge 2005 inside. A limiting rod 2008 connected to the spring 2007 also slides inside the limiting sleeve 2006. A limb placement component is engaged at the bottom end of the limiting rod 2008. The display screen 300 is installed on the outside of the second vertical plate 1006 and is communicatively connected to the signal processing module.

[0025] In one embodiment of the present invention, the signal processing module further includes a signal amplifier, a filter, a potentiometer, an analog-to-digital converter, and a Bluetooth transmitter. A Bluetooth receiver is installed inside the display screen 300. The signal amplifier, filter, potentiometer, analog-to-digital converter, and Bluetooth transmitter are electrically connected in sequence. The strain gauge 2005 is electrically connected to the signal amplifier. The Bluetooth transmitter and Bluetooth receiver are communicatively connected.

[0026] In one embodiment of the present invention, a knob 2002 is rotatably connected to the outside of the signal processing box 2001, and the knob 2002 is connected to the adjustment terminal of the potentiometer.

[0027] In one embodiment of the present invention, the limb placement component further includes an arc-shaped top plate 2010, a hanging ring 2011 installed at the center of the top surface of the arc-shaped top plate 2010, a hook 2009 installed at the bottom end of the limiting rod 2008, the hook 2009 and the hanging ring 2011 engaging with each other, and four sets of rivets installed on the top surface of the arc-shaped top plate 2010, with elastic bands 2012 connecting the opposing rivets.

[0028] In one embodiment of the present invention, the sides of the first longitudinal plate 1005 and the second longitudinal plate 1006 are provided with grooves 1007 near their respective bottom surfaces. A square rod 1008 is installed inside the groove 1007, and a pressure plate 1009 that slides in the groove 1007 is fitted on the outside of the square rod 1008. Bolts 1010 are threadedly connected to the bottom surfaces of the first longitudinal plate 1005 and the second longitudinal plate 1006, and the bolts 1010 press against the bottom surface of the pressure plate 1009.

[0029] Specifically, for a patient lying in bed, when testing their lower limb muscle strength, the bed's footrest is inserted into the groove 1007, and the bolt 1010 is rotated to press the pressure plate 1009, causing the pressure plate 1009 to press against the bed's footrest, thus fixing the device to the foot of the bed. The patient's feet pass through the four sets of elastic bands 2012, with the ankle and lower leg positioned within them. The four sets of elastic bands 2012 then bind the patient's lower leg to the curved top plate 2010. Next, the corresponding switches for the signal processing module and display screen 300 are pressed, and the knob 2002 is rotated to change the potentiometer's resistance value, thereby changing the voltage division in the circuit and causing the display screen 300 to... When the reading on the display is zero, the patient can raise their leg, compressing the spring 2007 and deforming the strain gauge 2005, causing a change in its resistance. This change in resistance of the strain gauge 2005 will cause a change in current or voltage in the circuit, thereby generating an electrical signal corresponding to the deformation of the spring 2007. This electrical signal will be transmitted to the signal processing module, where it will be amplified, filtered, and converted from analog to digital by a signal amplifier, filter, and analog-to-digital converter. The analog electrical signal will then be converted into a digital signal and finally displayed on the display screen 300 through the transmission and reception of the Bluetooth transmitter and receiver. Medical staff can then determine the patient's lower limb muscle strength based on this reading.

[0030] For a patient lying in bed, when testing their upper limb muscle strength, the bedside armrest is inserted into the groove 1007, and the bolt 1010 is rotated to press the pressure plate 1009, causing the pressure plate 1009 to press against the bedside armrest, thus fixing the device to the side of the bed. The patient's hand passes through the four sets of elastic bands 2012, with the wrist and forearm positioned within them. The four sets of elastic bands 2012 then bind the patient's forearm to the curved top plate 2010. Next, the corresponding switches for the signal processing module and the display screen 300 are pressed, and the knob 2002 is rotated to change the resistance value of the potentiometer, thereby changing the voltage division in the circuit, causing the display screen 300 to... When the displayed reading is zero, the patient can raise their arm, compressing the spring 2007 and deforming the strain gauge 2005, causing a change in its resistance. This change in resistance of the strain gauge 2005 will cause a change in current or voltage in the circuit, thereby generating an electrical signal corresponding to the deformation of the spring 2007. This electrical signal will be transmitted to the signal processing module, where it will be amplified, filtered, and converted from analog to digital by a signal amplifier, filter, and analog-to-digital converter. The analog electrical signal will then be converted into a digital signal and finally displayed on the display screen 300 through the transmission and reception of the Bluetooth transmitter and receiver. Medical staff can then determine the patient's upper limb muscle strength based on this reading.

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1 - Figure 6 This invention provides a technical solution: a limb muscle strength measuring device, comprising a fixing mechanism 100, a measuring mechanism 200, and a display screen 300. The fixing mechanism 100 includes a horizontal plate 1001, with a first vertical plate 1005 and a second vertical plate 1006 hinged to both sides of the horizontal plate 1001 respectively. Fixing members are provided on the sides of the first vertical plate 1005 and the second vertical plate 1006. The measuring mechanism 200 includes a signal processing box 2001 mounted on the bottom surface of the horizontal plate 1001, with a signal processing module installed inside the signal processing box 2001. A detection box 2003 is installed on the bottom surface of the first plate 1006. A strain gauge 2005 is suspended inside the detection box 2003 and is electrically connected to the signal processing module. The bottom surface of the detection box 2003 is connected to a limiting sleeve 2006. A spring 2007 connected to the center of the strain gauge 2005 is provided inside the limiting sleeve 2006. A limiting rod 2008 connected to the spring 2007 also slides inside the limiting sleeve 2006. A limb placement component is engaged at the bottom end of the limiting rod 2008. The display screen 300 is installed on the outside of the second vertical plate 1006 and is communicatively connected to the signal processing module.

[0033] In one embodiment of the present invention, the signal processing module further includes a signal amplifier, a filter, a potentiometer, an analog-to-digital converter, and a Bluetooth transmitter. A Bluetooth receiver is installed inside the display screen 300. The signal amplifier, filter, potentiometer, analog-to-digital converter, and Bluetooth transmitter are electrically connected in sequence. The strain gauge 2005 is electrically connected to the signal amplifier. The Bluetooth transmitter and Bluetooth receiver are communicatively connected.

[0034] In one embodiment of the present invention, a knob 2002 is rotatably connected to the outside of the signal processing box 2001, and the knob 2002 is connected to the adjustment terminal of the potentiometer.

[0035] In one embodiment of the present invention, the limb placement component further includes an arc-shaped top plate 2010, a hanging ring 2011 installed at the center of the top surface of the arc-shaped top plate 2010, a hook 2009 installed at the bottom end of the limiting rod 2008, the hook 2009 and the hanging ring 2011 engaging with each other, and four sets of rivets installed on the top surface of the arc-shaped top plate 2010, with elastic bands 2012 connecting the opposing rivets.

[0036] In one embodiment of the present invention, the sides of the first longitudinal plate 1005 and the second longitudinal plate 1006 are provided with grooves 1007 near their respective bottom surfaces. A square rod 1008 is installed inside the groove 1007, and a pressure plate 1009 that slides in the groove 1007 is fitted on the outside of the square rod 1008. Bolts 1010 are threadedly connected to the bottom surfaces of the first longitudinal plate 1005 and the second longitudinal plate 1006, and the bolts 1010 press against the bottom surface of the pressure plate 1009.

[0037] Specifically, for patients with free movement, when testing their lower limb muscle strength, first have the patient sit in a chair, and then bring out another chair. The two chairs should be of similar height. Place the edge of the chair seat into the groove 1007, and rotate the bolt 1010 to press the pressure plate 1009, causing the pressure plate 1009 to press against the edge of the chair seat, thus fixing the device to the edge of the chair seat. The patient's feet pass through the four elastic bands 2012, with the ankle and lower leg positioned within the four sets of elastic bands 2012. The four sets of elastic bands 2012 then bind the patient's lower leg to the curved top plate 2010. Next, press the corresponding switch on the signal processing module and display screen 300, and rotate the knob 2002 to change the potentiometer's resistance value. This changes the voltage division in the circuit, causing the reading on display screen 300 to be zero. At this point, the patient can raise their leg, compressing spring 2007 and deforming strain gauge 2005, resulting in a change in its resistance. The change in resistance of strain gauge 2005 causes a change in current or voltage in the circuit, which in turn generates an electrical signal corresponding to the deformation of spring 2007. This electrical signal is transmitted to the signal processing module, where it is amplified, filtered, and converted from analog to digital by a signal amplifier, filter, and analog-to-digital converter. The analog electrical signal is then converted into a digital signal and finally displayed on display screen 300 via Bluetooth transmitter and receiver. Medical staff can then determine the patient's lower limb muscle strength based on this reading.

[0038] For patients with free movement, when testing their upper limb muscle strength, first have the patient sit in a chair, then bring out another chair, the height of which should be higher than the patient's chair, and the brought-out chair should have armrests. Alternatively, have the patient sit at a table, and insert the chair armrest or table edge into the groove 1007. Rotate the bolt 1010 to press the pressure plate 1009, causing the pressure plate 1009 to press against the chair armrest or table edge, thereby fixing the device to the chair or table. The patient's hand passes through the four sets of elastic bands 2012, with the wrist and forearm within the four sets of elastic bands 2012. The four sets of elastic bands 2012 then bind the patient's forearm to the curved top plate 2010. Next, press the corresponding switch of the signal processing module and display screen 300, and rotate the knob 20. 02. By changing the resistance value of the potentiometer, the voltage division in the circuit is altered, causing the reading on display screen 300 to become zero. At this point, the patient can raise their arm, compressing spring 2007 and deforming strain gauge 2005, resulting in a change in its resistance value. The change in resistance of strain gauge 2005 causes a change in current or voltage in the circuit, thereby generating an electrical signal corresponding to the deformation of spring 2007. This electrical signal is transmitted to the signal processing module, where it is amplified, filtered, and converted from analog to digital by a signal amplifier, filter, and analog-to-digital converter. The analog electrical signal is then converted into a digital signal and finally displayed on display screen 300 via Bluetooth transmitter and receiver. Medical staff can then determine the patient's upper limb muscle strength based on this reading.

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figure 1 - Figure 6 The present invention provides a technical solution: a limb muscle strength measuring device, wherein a through hole 1012 is provided at the center of the top surface of a horizontal plate 1001, and a sliding hole is provided at the center of the bottom surface of the horizontal plate 1001. The through hole 1012 and the sliding hole are connected. A threaded sleeve 1013 is installed at the center of the top surface of a signal processing box 2001. The threaded sleeve 1013 slides in the sliding hole. A screw 1011 slides inside the through hole 1012, and the screw 1011 and the threaded sleeve 1013 are threadedly engaged.

[0041] In one embodiment of the present invention, the bottom surface of the horizontal plate 1001 is provided with connecting grooves 1002 on both sides. The first L-shaped block 1003 and the second L-shaped block 1004 are rotatably connected inside the connecting grooves 1002, and the free ends of the first L-shaped block 1003 and the second L-shaped block 1004 are respectively connected to the first vertical plate 1005 and the second vertical plate 1006. The first vertical plate 1005 and the horizontal plate 1001 are attracted to each other, and the second vertical plate 1006 and the first vertical plate 1005 are attracted to each other.

[0042] Specifically, before testing, the threaded sleeve 1013 is slid into the sliding hole, and the screw part of the screw 1011 is inserted into the through hole 1012. Then the screw 1011 is tightened to fix the horizontal plate 1001 and the signal processing box 2001 together. Then the second vertical plate 1006 and the first vertical plate 1005 are rotated in sequence to make the first vertical plate 1005 and the second vertical plate 1006 vertical.

[0043] After the test, unscrew screw 1011, take out measuring mechanism 200, and rotate first vertical plate 1005 and second vertical plate 1006 in sequence so that first vertical plate 1005 and horizontal plate 1001 are attracted together, and second vertical plate 1006 is attracted together with first vertical plate 1005.

[0044] It should be noted that, in the above embodiments, when testing the patient's limbs, it is necessary to ensure that the patient's limbs, which are fixed below the arc-shaped top plate 2010, are suspended in the air and do not come into contact with any objects other than the arc-shaped top plate 2010 and the elastic band 2012.

Claims

1. A limb muscle strength measuring device, characterized in that: The invention comprises a fixing mechanism (100), a measuring mechanism (200), and a display screen (300), wherein the fixing mechanism (100) comprises a horizontal plate (1001), and the two sides of the horizontal plate (1001) are respectively hinged with a first vertical plate (1005) and a second vertical plate (1006), and the sides of the first vertical plate (1005) and the second vertical plate (1006) are provided with fixing parts, and the measuring mechanism (200) comprises a signal processing box (2001) installed on the bottom surface of the horizontal plate (1001), a signal processing module is installed inside the signal processing box (2001), and a detection box (2003) is installed on the bottom surface of the signal processing box (2001). A strain gauge (2005) is suspended inside the detection box (2003) and is electrically connected to the signal processing module. The bottom surface of the detection box (2003) is connected to a limit sleeve (2006). A spring (2007) connected to the center of the strain gauge (2005) is provided inside the limit sleeve (2006). A limit rod (2008) connected to the spring (2007) is also slidably provided inside the limit sleeve (2006). A limb placement piece is engaged at the bottom end of the limit rod (2008). The display screen (300) is installed on the outside of the second longitudinal plate (1006) and is communicatively connected to the signal processing module.

2. The limb muscle strength measuring device according to claim 1, characterized in that: The signal processing module comprises a signal amplifier, a filter, a potentiometer, an analog-to-digital converter, and a Bluetooth transmitter. A Bluetooth receiver is installed inside the display screen (300). The signal amplifier, the filter, the potentiometer, the analog-to-digital converter, and the Bluetooth transmitter are electrically connected in sequence. The strain gauge (2005) is electrically connected to the signal amplifier, and the Bluetooth transmitter is communicatively connected to the Bluetooth receiver.

3. The limb muscle strength measuring device according to claim 2, characterized in that: The outer side of the signal processing box (2001) is rotatably connected to a knob (2002), and the knob (2002) is transmission-connected to the adjustment end of the potentiometer.

4. The limb muscle strength measuring device according to claim 1, characterized in that: The limb placement piece comprises an arc-shaped top plate (2010), a hanging ring (2011) is installed at the center of the top surface of the arc-shaped top plate (2010), a hook (2009) is installed at the bottom end of the limit rod (2008), the hook (2009) and the hanging ring (2011) are engaged with each other, four groups of rivets are installed on the top surface of the arc-shaped top plate (2010), and elastic bands (2012) are connected between the opposite rivets.

5. The limb muscle strength measuring device according to claim 1, characterized in that: A pair of fixing bars (2004) are installed at the four inner corners of the detection box (2003), and the four corners of the strain gauge (2005) are clamped by the four pairs of fixing bars (2004).

6. The limb muscle strength measuring device according to claim 1, characterized in that: A through hole (1012) is provided at the center of the top surface of the transverse plate (1001), a sliding hole is provided at the center of the bottom surface of the transverse plate (1001), the through hole (1012) and the sliding hole are connected, a threaded sleeve (1013) is installed at the center of the top surface of the signal processing box (2001), the threaded sleeve (1013) slides in the sliding hole, a screw (1011) slides inside the through hole (1012), and the screw (1011) and the threaded sleeve (1013) are threadedly engaged.

7. The limb muscle strength measuring device according to claim 1, characterized in that: The sides of the first longitudinal plate (1005) and the second longitudinal plate (1006) are provided with grooves (1007) near their respective bottom surfaces, a square rod (1008) is installed inside the groove (1007), and a pressure plate (1009) sliding in the groove (1007) is mounted on the outer side of the square rod (1008), and the bottom surfaces of the first longitudinal plate (1005) and the second longitudinal plate (1006) are both threadedly engaged with bolts (1010), and the bolts (1010) press the bottom surface of the pressure plate (1009).

8. The limb muscle strength measuring device according to claim 1, characterized in that: Both sides of the bottom surface of the transverse plate (1001) are provided with connecting grooves (1002), and the first L-shaped block (1003) and the second L-shaped block (1004) are rotatably connected inside the connecting grooves (1002), and the free ends of the first L-shaped block (1003) and the second L-shaped block (1004) are connected to the first longitudinal plate (1005) and the second longitudinal plate (1006) respectively, and the first longitudinal plate (1005) and the transverse plate (1001) are mutually adsorbed, and the second longitudinal plate (1006) and the first longitudinal plate (1005) are mutually adsorbed.

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