Soft tissue cyclic shear stress and strain online detection equipment

Abstract

The present invention provides an online detection device for periodic shear stress and strain of soft tissue, comprising a soft tissue detection device. Since the soft tissue detection device has a soft tissue probe, the detection surface of the soft tissue probe is fixedly connected to the surface of the living soft tissue to be detected, and the soft tissue probe performs reciprocating linear motion under the drive of a shear drive mechanism, thereby being able to drive the living soft tissue to be detected to produce corresponding synchronous deformation, thereby being able to detect the strain force of the living soft tissue; since a tension and pressure sensor is arranged between the soft tissue probe and the shear drive mechanism, the pressure or tension exerted on the soft tissue probe can be synchronously detected; and since a displacement sensor is provided, the displacement of the soft tissue probe can also be synchronously detected. Therefore, after the soft tissue probe performs multiple reciprocating linear motions, the periodic shear stress-strain data of the living soft tissue to be detected can be obtained, thereby being able to perform a more accurate analysis of the material properties of the living soft tissue.

Description

Technical Field

[0001] The present invention relates to the fields of biomedical engineering and material mechanics, and in particular to an online detection device for periodic shear stress and strain of soft tissue. Background Art

[0002] Soft tissue is a general term for the human body's skin, subcutaneous tissue, ligaments, joint capsules, muscles, tendons, synovial bursae, nerves, blood vessels, etc., relative to hard tissue (bone) and independent organs. As a result of natural evolutionary selection, soft tissue can efficiently realize various precise physiological functions and needs through its complex composition and fine structure. Therefore, considering human soft tissue as a material and studying its material properties are the key directions of biomedical engineering and bionic materials.

[0003] However, it's clear that living soft tissue cannot be tested using standardized methods in materials science. This is due to the limitations of living organisms. Classical material mechanics methods are designed for manipulatable objects, requiring the object material to be fabricated into test specimens of specified shapes and dimensions. This premise establishes a complete testing system based on standard samples. However, these techniques are virtually impossible to directly apply to living organisms. For example, it's impossible to prepare standard samples from a single piece; the testing window is short, making it impossible to test the object for extended periods; and testing conditions, such as load, frequency, and temperature, are extremely restrictive. To date, mechanical characterization of soft tissue has primarily been performed using ex vivo tissue specimens. For example, the soft tissue testing instruments and systems proposed in Chinese invention patents CN107941613A, CN104535415A, CN106680114A, CN106370519A, CN105300812A, and CN104977211A all target ex vivo tissue specimens, but the test results from these specimens are rarely convincing.

[0004] Currently, in vivo measurements, driven by the need for non-invasiveness and harmlessness, primarily rely on indirect testing methods such as ultrasound and lasers. For example, Chinese invention patent CN1596823A, "A System for Acquiring Dynamic Load Response Parameters of Soft Tissue in Vivo," discloses an in vivo detection method using ultrasound. Reports on direct mechanical stress-strain measurements of soft tissue are still rare. Negishi T, Ito K, Kamono A, et al., in their paper "Strain-rate dependence of viscous properties of the plantar soft tissue identified by aspherical indentation test," J Mech Behav Biomed Mater. 2020;102:103470, describe a plantar tapping device capable of providing simple single-shot stress-strain and relaxation data. However, this still falls far short of the dynamic cyclic stress-strain response and viscoelastic analysis used in classical material mechanics.

[0005] The transverse shear resistance and tangential stress-strain behavior of soft tissue are important material properties, but as mentioned above, these properties can currently only be tested by preparing ex vivo specimens. If direct dynamic mechanical measurements of living soft tissue could be achieved, it would provide more precise measurement and analysis of its material properties, allowing for comparison and verification with indirect measurement methods such as ultrasound. This would be of great significance for understanding soft tissue properties, providing more data for clinical diagnosis and treatment, and designing biomimetic materials. Summary of the Invention

[0006] To solve the above problems, an online detection device for periodic shear stress and strain of soft tissue is provided, which can directly detect the shear stress-strain performance of living soft tissue. The present invention adopts the following technical solutions:

[0007] The present invention provides an online detection device for periodic shear stress and strain of soft tissue, which is used to detect the periodic shear stress-strain of living soft tissue. The device is characterized in that it includes: a soft tissue detection device, which has: a soft tissue probe, which is used to detect the strain force of living soft tissue and has a detection surface, which is fixedly connected to the surface of the living soft tissue to be detected; a tension and pressure sensor, which is used to detect the tension or pressure borne by the living soft tissue; a displacement sensor, which is used to detect the displacement of the living soft tissue and has a detection end, which is correspondingly arranged below the soft tissue probe; and a shear drive mechanism, which is used to drive the soft tissue probe to perform reciprocating linear motion at a predetermined frequency within a predetermined displacement range, thereby causing the living soft tissue to produce synchronous deformation, wherein the tension and pressure sensor is arranged between the soft tissue probe and the shear drive mechanism.

[0008] The online detection equipment for periodic shear stress and strain of soft tissue provided by the present invention may also have such technical features, wherein the shear drive mechanism includes: a driving motor; an eccentric turntable, installed at the output end of the driving motor; a turntable transmission member, having a connecting end and a sleeve hole matching the eccentric turntable, and being sleeved on the eccentric turntable through the sleeve hole; a first connecting rod, one end of which is connected to the connecting end of the turntable transmission member, and the other end is connected to the tension and pressure sensor; and a second connecting rod, one end of which is connected to the tension and pressure sensor, and the other end is connected to the soft tissue probe, and the length direction of the soft tissue probe is consistent with the length direction of the second connecting rod.

[0009] The soft tissue periodic shear stress and strain online detection device provided by the present invention may also have such technical features, wherein the shear drive mechanism also includes a limiting member having a limiting through hole matching the first connecting rod, and the first connecting rod passes through the limiting through hole, thereby limiting the movement direction of the first connecting rod.

[0010] The soft tissue periodic shear stress and strain online detection device provided by the present invention may also have such a technical feature, wherein the eccentric turntable has an eccentric hole, which is arranged at a position outside the center of the eccentric turntable, and the eccentric turntable is installed at the output end of the drive motor through the eccentric hole.

[0011] The soft tissue cyclic shear stress and strain online detection device provided by the present invention may also have such technical features, wherein the displacement sensor is a magnetic ring rod type displacement sensor, the detection end includes a detection rod and a magnetic ring mounted on the detection rod, and the magnetic ring is installed below the soft tissue probe.

[0012] The soft tissue periodic shear stress and strain online detection device provided by the present invention may also have such a technical feature, wherein the detection surface is a rigid plane and is fixedly connected to the surface of the living soft tissue by an adhesive.

[0013] The soft tissue periodic shear stress and strain online detection device provided by the present invention may also have such a technical feature, wherein the detection surface is the adsorption surface of the vacuum suction cup, which is adsorbed and fixed on the surface of the living soft tissue.

[0014] The soft tissue periodic shear stress and strain online detection device provided by the present invention may also have the following technical features: the displacement range is -20mm to 20mm, and the frequency is ≤100Hz.

[0015] The online detection equipment for periodic shear stress and strain of soft tissue provided by the present invention may also have such technical features, and also include: a stabilization device for the part to be tested, which is used to keep the body part corresponding to the living soft tissue stable during the detection process, and has: a bracket; a positioning member installed on the bracket, which is used to support and position the body part; and a flexible fixing member, which is installed on the bracket at a position corresponding to the positioning member, which is used to fix the body part at the positioning member, wherein the positioning member has a through hole matching the soft tissue probe and reciprocating linear motion, which is used to expose the soft tissue probe.

[0016] The soft tissue cyclic shear stress and strain online detection device provided by the present invention may also have such technical features, and also include: a data acquisition device, which is respectively communicated with the soft tissue probe, the displacement sensor and the tension and pressure sensor, and is used to collect the strain detected by the soft tissue probe, the displacement detected by the displacement sensor, and the tension or pressure detected by the tension and pressure sensor.

[0017] Functions and effects of the invention

[0018] According to the soft tissue periodic shear stress and strain online detection device of the present invention, it includes a soft tissue detection device for detecting the periodic shear stress-strain of living soft tissue. Since the soft tissue detection device has a soft tissue probe, the detection surface of the soft tissue probe is fixedly connected to the surface of the living soft tissue to be detected, and the soft tissue probe performs reciprocating linear motion under the drive of the shear drive mechanism, it can drive the living soft tissue to be detected to produce corresponding synchronous deformation, thereby being able to detect the strain force of the living soft tissue; since there is a tension and pressure sensor arranged between the soft tissue probe and the shear drive mechanism, the soft tissue probe can be synchronously detected. pressure or tension; and because it has a displacement sensor, it can also synchronously detect the displacement of the soft tissue probe. Therefore, after the soft tissue probe performs multiple reciprocating linear motions, the periodic shear stress-strain data of the living soft tissue to be tested can be obtained. The periodic shear stress-strain data is a characterization method of dynamic mechanical analysis (DMA) in material mechanics. It can be analyzed using the classic DMA method to characterize the shear stress-strain mechanical properties of the material, thereby enabling a more accurate analysis of the material properties of living soft tissue, and thus providing more accurate and reliable data basis for clinical diagnosis and treatment, bionic material design, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional diagram of an online detection device for cyclic shear stress and strain of soft tissue according to an embodiment of the present invention;

[0020] Figure 2 2 is a side view of an online detection device for cyclic shear stress and strain of soft tissue according to an embodiment of the present invention;

[0021] Figure 3 is a partially cutaway front view of an online detection device for soft tissue periodic shear stress and strain according to an embodiment of the present invention;

[0022] Figure 4 yes Figure 3 An enlarged view of the portion within the middle frame A;

[0023] Figure 5 4 is a perspective view of a device for stabilizing a part to be measured according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Soft tissue cyclic shear stress and strain online detection equipment 10; soft tissue detection device 20; soft tissue probe 21; detection surface 211; displacement sensor 22; detection rod 221; magnetic ring 222; tension and pressure sensor 23; shear drive mechanism 24; drive motor 241; eccentric turntable 242; eccentric hole 2421; turntable transmission member 243; first connecting rod 244; second connecting rod 245; limit member 246; data acquisition device 30; loading platform 40; metal frame 41; upper cover plate 42; first supporting plate 43; second supporting plate 44; extension plate 45; device for stabilizing the part to be tested 50; bracket 51; positioning member 52; flexible fixing member 53. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the following is a detailed description of the soft tissue cyclic shear stress and strain online detection device of the present invention in combination with embodiments and drawings.

[0027] <Example 1>

[0028] This embodiment provides an online detection device for cyclic shear stress and strain of soft tissue, which can directly detect the cyclic shear stress-strain of living soft tissue. In this embodiment, the living soft tissue is the soft tissue of the sole of the subject's foot.

[0029] Figure 1 It is a three-dimensional diagram of an online detection device for cyclic shear stress and strain of soft tissue in an embodiment of the present invention.

[0030] Figure 2 4 is a side view of an online detection device for cyclic shear stress and strain of soft tissue in an embodiment of the present invention.

[0031] Figure 3 It is a front view with partial section of the online detection device for soft tissue periodic shear stress and strain in an embodiment of the present invention.

[0032] like Figure 1-3 As shown, the soft tissue periodic shear stress and strain online detection device 10 includes a soft tissue detection device 20 and a data acquisition device 30.

[0033] The soft tissue detection device 20 is used to detect the shear stress-strain of living soft tissue, and includes a soft tissue probe 21 , a displacement sensor 22 , a tension and pressure sensor 23 and a shear drive mechanism 24 .

[0034] The soft tissue probe 21 is used to detect strain in living soft tissue. In this embodiment, the soft tissue probe 21 is a conventional soft tissue probe, having a detection surface 211. This detection surface 211 is a rigid surface. The outer surface of the living soft tissue to be detected (i.e., the skin of the subject's foot) is adhered to this rigid surface with an adhesive. This means that the detection surface 211 and the outer surface of the living soft tissue are fixedly connected. Movement and twisting of the detection surface 211 will cause synchronous deformation of the living soft tissue. Furthermore, the area of ​​this rigid surface is the force-bearing area.

[0035] In this embodiment, the adhesive is a skin adhesive in the prior art, which is non-toxic and easy to clean.

[0036] The displacement sensor 22 is used to detect the displacement of the soft tissue probe 21, that is, the displacement of the living soft tissue adhered to the soft tissue probe 21. In this embodiment, the displacement sensor 22 is a magnetic ring rod-type displacement sensor. Its detection end includes a detection rod 221 and a magnetic ring 222. The detection rod 221 extends horizontally, and the magnetic ring 222 is mounted on the detection rod 221. The magnetic ring 222 is installed below the soft tissue probe 21 via corresponding connectors. Therefore, when the soft tissue probe 21 moves, the magnetic ring 222 moves on the detection rod 221 along the extension direction of the detection rod 221, thereby detecting the displacement of the soft tissue probe 21.

[0037] The tension and pressure sensor 23 is used to detect the tension or pressure exerted on the soft tissue probe 21 by the shear drive mechanism 24, that is, to detect the tension or pressure exerted on the living soft tissue adhered to the soft tissue probe 21. In this embodiment, the tension and pressure sensor 23 is a high-precision tension and pressure sensor, disposed between the soft tissue probe 21 and the shear drive mechanism 24. The configuration of the tension and pressure sensor 23 will be described in detail below in conjunction with the specific structure of the shear drive mechanism 24.

[0038] The shear drive mechanism 24 is used to drive the soft tissue probe 21 to perform reciprocating linear motion within a predetermined displacement range at a predetermined frequency, thereby causing synchronous deformation of the living soft tissue adhered to the soft tissue probe 21. The shear drive mechanism 24 includes a drive motor 241, an eccentric turntable 242, a turntable transmission member 243, a first connecting rod 244, a second connecting rod 245, and a stop member 246.

[0039] Figure 4 yes Figure 3 Enlarged view of the portion within frame A.

[0040] like Figure 3 and Figure 4 As shown, the driving motor 241 is a servo motor having an output end.

[0041] The eccentric turntable 242 is a circular turntable with a circular eccentric hole 2421. The eccentric hole 2421 is located at a different position from the center of the eccentric turntable 242. The eccentric hole 2421 is mounted on the output end of the drive motor 241 and meshed with the output end. Therefore, the drive motor 241 can drive the eccentric turntable 242 to rotate approximately with the eccentric hole 2421 as the center of rotation.

[0042] The turntable transmission member 243 is roughly teardrop-shaped, with its smaller end being the connecting end with a pivot hole provided on the connecting end, and a larger end being provided with a socket hole matching the eccentric turntable 242. The turntable transmission member 243 is sleeved on the outer edge of the eccentric turntable 242 through the socket hole, and the connecting end is rotatably connected to one end of the first connecting rod 244.

[0043] A pivot hole is defined at one end of the first connecting rod 244, which is adjacent to the turntable transmission member 243. The rotating shaft passes through both the pivot hole of the first connecting rod 244 and the pivot hole of the turntable transmission member 243, thereby rotatably connecting the first connecting rod 244 and the turntable transmission member 243. The other end of the first connecting rod 244 is connected to the tension and pressure sensor 23 via a coupling. The limiting member 246 has a circular limiting hole (not shown) extending horizontally and matching the first connecting rod 244. The first connecting rod 244 is also inserted into the limiting hole, so that the movement of the first connecting rod 244 is restricted to the extending direction of the limiting hole.

[0044] The second connecting rod 245 is relatively short, one end of which is connected to the tension and pressure sensor 23 via a coupling, and the other end is connected to the base of the soft tissue probe 21 , and the length direction of the soft tissue probe 21 is consistent with the length direction of the second connecting rod 245 .

[0045] The tension and pressure sensor 23 is disposed between the first connecting rod 244 and the second connecting rod 245. As described above, the tension and pressure sensor 23 is connected to the ends of the two connecting rods through couplings, and can measure stress changes on the connecting rods.

[0046] In addition, the detection rod 221 and the magnetic ring 222 of the displacement sensor 22 extending in the horizontal direction (ie, the direction of arrows D1 and D2) also limit the soft tissue probe 21, so that the soft tissue probe 21 can only move in the directions indicated by arrows D1 and D2.

[0047] Therefore, under the drive of the driving motor 241, the eccentric turntable 242 rotates eccentrically, driving the turntable transmission member 243 to move, and then driving the first connecting rod 244 and the second connecting rod 245 to move in the horizontal direction, further driving the soft tissue probe 21 to move in the horizontal direction, that is, Figure 4 The direction indicated by the arrows D1 and D2. Figure 4 Rotate the position shown in B1 to Figure 4When the soft tissue probe 21 is at the position shown by B2, it moves in the direction of the arrow D1. When the eccentric hole 2421 reaches the B2 position, the soft tissue probe 21 reaches the maximum stroke in the direction of the arrow D1. Then, the soft tissue probe 21 changes to move in the direction of the arrow D2 under the drive of the shear drive mechanism 24. Similarly, when the eccentric hole 2421 reaches the B1 position, the soft tissue probe 21 reaches the maximum stroke in the direction of the arrow D2. The above process is repeated, and the soft tissue probe 21 performs reciprocating linear motion.

[0048] In this embodiment, taking into account the comfort of the subject and the general tolerable force strength of human soft tissue, the displacement range of the reciprocating linear motion of the soft tissue probe 21 is limited to -20 mm to 20 mm by adjusting the position of the eccentric hole 2421 and the parameters of the servo motor, and the frequency of the reciprocating linear motion of the soft tissue probe 21 is controlled to 100 Hz or below.

[0049] The data acquisition device 30 is used to collect the strain detected by the soft tissue probe 21, the displacement detected by the displacement sensor 22, and the tension or pressure detected by the tension and pressure sensor 23. In this embodiment, the data acquisition device 30 is a local server, which is connected to the soft tissue probe 21, the displacement sensor 22, and the tension and pressure sensor 23 via transmission lines.

[0050] In addition, if Figure 1-3 As shown, the soft tissue detection device 20 and the data acquisition device 30 are both mounted on a loading platform 40. The loading platform 40 includes a metal frame 41, an upper cover plate 42 mounted at the upper center of the metal frame 41, a first support plate 43 mounted in the middle of the metal frame 41, a second support plate 44 mounted at the lower center of the metal frame 41, and an extension plate 45 mounted at the outer edge of the metal frame 41. Partial components of the soft tissue detection device 20 are placed on the first support plate 43, while the drive motor 241 and the data acquisition device 30 are placed on the second support plate 44. A square through-hole is provided on the upper cover plate 42 at a position corresponding to the soft tissue probe 21. The soft tissue probe 21 is exposed through the through-hole, facilitating detection. Furthermore, the through-hole is slightly larger than the displacement range of the soft tissue probe 21, so that the through-hole does not affect the movement of the soft tissue probe 21.

[0051] In addition, a plurality of rollers are provided below the mounting platform 40 so as to facilitate the movement of the soft tissue periodic shear stress and strain online detection device 10 .

[0052] In addition, the soft tissue periodic shear stress and strain online detection device 10 also includes a device for stabilizing the part to be tested, which is used to keep the corresponding body part stable during the detection process, so that the detection can eliminate the interference of body movements.

[0053] Figure 54 is a perspective view of a device for stabilizing a part to be measured according to an embodiment of the present invention.

[0054] like Figure 5 As shown, in this embodiment, the living soft tissue to be detected is the plantar soft tissue, and the corresponding body part is the foot of the subject, so the structure of the stabilizing device 50 for the part to be detected is a structure designed accordingly for fixing the foot.

[0055] The device 50 for stabilizing the part to be tested includes a bracket 51 , a positioning member 52 and a plurality of flexible fixing members 53 .

[0056] The bracket 51 is mounted on the extension plate 45 of the mounting platform 40 to provide support for the body part to be measured.

[0057] The positioning member 52 is used by the subject to position the body part to be tested (ie, the foot), so as to accurately position the soft tissue to be tested at the soft tissue probe 21. In this embodiment, the positioning member 52 has a shape that matches the foot.

[0058] Flexible fixing member 53 is mounted on bracket 51 and is used to fix the body part to be tested to the positioning member 52 on bracket 51, thereby maintaining the stability of the body part during the test. Part of flexible fixing member 53 is mounted at a position corresponding to positioning member 52 to fix the foot. In this embodiment, flexible fixing member 53 is a strap.

[0059] In addition, square through holes are also provided on the bracket 51 and the positioning member 52 at positions corresponding to the soft tissue probe 21 , so that the soft tissue probe 21 can be exposed from the through holes.

[0060] As described above, after the soft tissue probe 21 performs multiple reciprocating linear motions, the data acquisition device 30 correspondingly collects multiple sets of tension or pressure, displacement data and the corresponding soft tissue strain, that is, it collects periodic shear stress-strain data. The periodic shear stress-strain data is a characterization method of dynamic mechanical analysis (DMA) in material mechanics. It can be analyzed using the classic DMA method to characterize the shear stress-strain mechanical properties of the material, thereby enabling a more accurate analysis of the material properties of living soft tissue.

[0061] <Example 2>

[0062] This embodiment provides an online detection device for cyclic shear stress and strain of soft tissue. Compared with the first embodiment, the difference is that in this embodiment, the soft tissue probe 21 has a vacuum suction cup, and the detection surface 211 is the adsorption surface of the vacuum suction cup, which is fixed to the surface of the living soft tissue to be tested by adsorption. The area of ​​the adsorption surface of the vacuum suction cup is the force-bearing area.

[0063] In this embodiment, other structures and detection methods are consistent with those in the first embodiment, and therefore will not be described again.

[0064] Example Function and Effect

[0065] According to the soft tissue periodic shear stress and strain online detection device 10 provided in this embodiment, it includes a soft tissue detection device 20 for detecting the periodic shear stress-strain of living soft tissue. Since the soft tissue detection device 20 has a soft tissue probe 21, the detection surface 211 of the soft tissue probe 21 is fixedly connected to the surface of the living soft tissue to be detected, and the soft tissue probe 21 performs reciprocating linear motion under the drive of the shear drive mechanism 24, it can drive the living soft tissue to be detected to produce corresponding synchronous deformation, thereby being able to detect the strain force of the living soft tissue; since there is a tension and pressure sensor 23 arranged between the soft tissue probe 21 and the shear drive mechanism 24, it is possible The pressure or tension applied to the soft tissue probe 21 is detected synchronously; and because the displacement sensor 22 is provided, the displacement of the soft tissue probe 21 can also be detected synchronously. Therefore, after the soft tissue probe 21 performs multiple reciprocating linear motions, the periodic shear stress-strain data of the living soft tissue to be tested can be obtained. The periodic shear stress-strain data is a characterization method of dynamic mechanical analysis (DMA) in material mechanics. It can be analyzed using the classic DMA method to characterize the shear stress-strain mechanical properties of the material, thereby enabling a more accurate analysis of the material properties of the living soft tissue, thereby providing a more accurate and reliable data basis for clinical diagnosis and treatment, bionic material design, etc.

[0066] Specifically, the shear drive mechanism 24 includes a drive motor 241, an eccentric turntable 242, a turntable transmission member 243, a first connecting rod 244, a second connecting rod 245, and a limit member 246. Driven by the drive motor 241, the eccentric turntable 242 rotates eccentrically, driving the first connecting rod 244 to perform reciprocating linear motion in the horizontal direction via the turntable transmission member 243. This, in turn, drives the soft tissue probe 21 to perform synchronous reciprocating linear motion via the second connecting rod 245, thereby enabling the detection of periodic shear stress-strain in living soft tissue. Simultaneously, by adjusting the position of the eccentric hole 2421 on the eccentric turntable 242 and the parameters of the servo motor, the displacement range and frequency of the reciprocating linear motion can be adjusted. In this embodiment, the displacement range of the reciprocating linear motion is limited to -20 mm to 20 mm, and the frequency is controlled at or below 100 Hz, thereby preventing the subject from feeling uncomfortable or even injured during the test, thereby ensuring the subject's health and experience while collecting data.

[0067] In the first embodiment, the detection surface 211 of the soft tissue probe 21 is a rigid surface. The surface of the soft tissue to be tested is bonded to the rigid surface with an adhesive, achieving a fixed connection. This allows the soft tissue probe 21 to synchronously deform the soft tissue to be tested during testing. While adhesive bonding offers advantages such as effective fixation and a high degree of synchronization between the soft tissue to be tested and the soft tissue probe 21, resulting in more accurate data, it also has disadvantages such as more complex experimental setup, a limited selection of adhesives, and potentially lower subject compliance.

[0068] In the second embodiment, the soft tissue probe 21 has a vacuum suction cup, and its detection surface 211 is the adsorption surface of the vacuum suction cup. The detection surface 211 is fixedly connected to the surface of the soft tissue to be tested (i.e., the skin of the corresponding body part) by adsorption, thereby driving the synchronous deformation of the living soft tissue to be tested during the detection process. The adsorption method has the advantages of convenient operation and high willingness of the subjects to cooperate. Correspondingly, due to the large deformation space of the suction cup itself, the degree of synchronization between the soft tissue to be tested and the soft tissue probe 21 is slightly weakened, and the fixing effect is not as good as the bonding method. Therefore, in actual application, the two schemes should be selected according to the actual situation of the body part to be tested, the willingness of the subjects, etc.

[0069] The above embodiments are only used to illustrate specific implementations of the present invention, and the present invention is not limited to the description scope of the above embodiments.

[0070] In the above embodiment, the shear drive mechanism 24 drives the soft tissue probe 21 to perform reciprocating linear motion in the horizontal direction, thereby detecting the shear stress-strain of living soft tissue. In other schemes of the present invention, according to the actual situation of the body part being tested, the direction of each component in the shear drive mechanism 24 can also be changed accordingly, so that the shear drive mechanism 24 drives the soft tissue probe 21 to perform reciprocating linear motion in other directions, which can also achieve the technical effect of the present invention.

[0071] In the above embodiment, the data acquisition device 30 is a local server, which is connected to the soft tissue probe 21, the displacement sensor 22 and the tension and pressure sensor 23 through transmission lines respectively. In other schemes of the present invention, the data acquisition device 30 can also be a remote device, such as a cloud server, which is wirelessly communicated with the soft tissue probe 21, the displacement sensor 22 and the tension and pressure sensor 23, and the technical effects of the present invention can also be achieved.

[0072] In the above embodiment, the living soft tissue to be detected is the plantar soft tissue, and the corresponding body part is the foot of the subject. Therefore, the structure of the stabilization device 50 of the part to be tested in the embodiment is a structure designed accordingly to fix the foot. In other schemes of the present invention, the soft tissue periodic shear stress and strain online detection equipment 10 can also be used to detect soft tissues in other parts of the human body. Accordingly, the stabilization device 50 of the part to be tested adopts a structural design that matches other parts of the human body, and can also achieve the technical effect of the present invention.

Claims

1. An online detection device for periodic shear stress and strain of soft tissue, used for detecting periodic shear stress-strain of living soft tissue, characterized by: include: A soft tissue detection device having: a soft tissue probe, for detecting the strain of the living soft tissue, having a detection surface fixedly connected to the surface of the living soft tissue to be detected; a tension and pressure sensor, used to detect the tension or pressure borne by the living soft tissue; a displacement sensor for detecting the displacement of the living soft tissue, comprising a detection end, the detection end being correspondingly arranged below the soft tissue probe; a shear drive mechanism for driving the soft tissue probe to perform reciprocating linear motion within a predetermined displacement range at a predetermined frequency, thereby causing synchronous deformation of the living soft tissue; as well as The device for stabilizing the part to be tested is used to keep the body part corresponding to the living soft tissue stable during the testing process. Wherein, the tension and pressure sensor is arranged between the soft tissue probe and the shear drive mechanism. The device for stabilizing the part to be tested comprises: Bracket; a positioning member, mounted on the support, for supporting and positioning the body part; and a flexible fixing member, mounted on the bracket at a position corresponding to the positioning member, for fixing the body part at the positioning member; Wherein, the positioning member has a through hole matching the soft tissue probe and the reciprocating linear motion, so as to expose the soft tissue probe.

2. The soft tissue cyclic shear stress and strain online detection device according to claim 1, Its characteristics are: Wherein, the shear drive mechanism comprises: Drive motor; An eccentric turntable is mounted on the output end of the driving motor; A turntable transmission member, having a connecting end and a sleeve hole matching the eccentric turntable, and being sleeved on the eccentric turntable through the sleeve hole; a first connecting rod, one end of which is connected to the connecting end of the turntable transmission member, and the other end of which is connected to the tension and pressure sensor; and The second connecting rod has one end connected to the tension and pressure sensor and the other end connected to the soft tissue probe. The length direction of the soft tissue probe is consistent with the length direction of the second connecting rod.

3. The soft tissue cyclic shear stress and strain online detection device according to claim 2, characterized in that: in, The shear drive mechanism further includes a limiting member having a limiting through hole matching the first connecting rod. The first connecting rod passes through the limiting through hole, thereby limiting the movement direction of the first connecting rod.

4. The soft tissue cyclic shear stress and strain online detection device according to claim 2, characterized in that: in, The eccentric rotating disk has an eccentric hole, which is arranged at a position other than the center of the eccentric rotating disk. The eccentric turntable is installed at the output end of the driving motor through the eccentric hole.

5. The soft tissue cyclic shear stress and strain online detection device according to claim 1, characterized in that: in, The displacement sensor is a magnetic ring rod type displacement sensor, The detection end includes a detection rod and a magnetic ring sleeved on the detection rod. The magnetic ring is installed below the soft tissue probe.

6. The soft tissue cyclic shear stress and strain online detection device according to claim 1, characterized in that: in, The detection surface is a rigid plane and is fixedly connected to the surface of the living soft tissue via an adhesive.

7. The soft tissue cyclic shear stress and strain online detection device according to claim 1, characterized in that: in, The detection surface is the adsorption surface of the vacuum suction cup, which is adsorbed and fixed on the surface of the living soft tissue.

8. The soft tissue cyclic shear stress and strain online detection device according to claim 1, characterized in that: in, The displacement range is -20mm to 20mm. The frequency is ≤100 Hz.

9. The soft tissue periodic shear stress and strain online detection device according to claim 1, characterized in that: Also includes: The data acquisition device is respectively connected to the soft tissue probe, the displacement sensor and the tension and pressure sensor for acquiring the strain force detected by the soft tissue probe, the displacement detected by the displacement sensor and the tension or pressure detected by the tension and pressure sensor.

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