Achilles tendon stent adaptive to biomechanics and capable of monitoring repair state in real time

Abstract

The invention provides a biomechanically adaptive achilles tendon stent system capable of monitoring a repair state, the achilles tendon stent system comprises a sheet-shaped negative Poisson's ratio structural body with a microneedle, and the negative Poisson's ratio structural body is used for being attached and fixed to an achilles tendon and covering a achilles tendon broken end gap. When the tendo calcaneus is stretched, the cross sectional area of the tendo calcaneus is increased, and through structural parameter design, the tendo calcaneus stent system is lengthened along with stretching of the tendo calcaneus in the length direction of the tendo calcaneus and expands and deforms along with stretching of the tendo calcaneus in the circumferential direction, and the tendo calcaneus stent system is matched with deformation of the cross sectional area of the tendo calcaneus. The negative Poisson's ratio structural body is of a patch structure, and the negative Poisson's ratio structural body is well attached to the achilles tendon. The achilles tendon stent system is provided with a biosensor, and the biosensor can sense achilles tendon tissue deformation response and monitor the repair state of the achilles tendon tissue. The achilles tendon stent system can be self-degraded by introducing a degradable material and cannot be left in a body as a foreign matter.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and more specifically, to a biomechanically adapted Achilles tendon stent system capable of monitoring the repair status. Background Art

[0002] The Achilles tendon is the most vulnerable tendon in the human body. Epidemiological statistics show that Achilles tendon rupture accounts for about 40% of all tendon ruptures. In recent years, the incidence of Achilles tendon rupture has been about 11 / 100,000 to 40 / 100,000, of which more than 60% are related to sports. In particular, 75% of Achilles tendon ruptures occur in male athletes aged 30 to 40, which may be related to the long-term strain of athletes and the decrease in the mechanical strength of the Achilles tendon due to aging. Therefore, for specific populations such as sports athletes, the repair of Achilles tendon rupture is crucial.

[0003] In case of complete Achilles tendon rupture, the related art provides a surgical suture solution for the Achilles tendon. However, the surgical suture solution often causes scar formation during the repair of the Achilles tendon section after surgery. A large scar may be formed after surgery, affecting the appearance and function. There are also related technologies that provide a solution of sleeved Achilles tendon with a cylinder, but the Achilles tendon is a negative Poisson's ratio structure. When the Achilles tendon is stretched, its cross section will increase, resulting in a poor fit between the cylinder and the Achilles tendon. The cylinder has poor fit, which is not conducive to accelerating the repair of the Achilles tendon.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] In order to solve one of the above technical problems, the present application provides a biomechanically adapted Achilles tendon stent system capable of monitoring the repair status.

[0006] The present invention adopts the following technical solutions:

[0007] A biomechanically adapted Achilles tendon support system capable of monitoring the repair status comprises a negative Poisson's ratio structure, which is in sheet form and is used to fit and fix to the Achilles tendon and cover the gap at the stump of the Achilles tendon.

[0008] Optionally, the Achilles tendon support system includes a plurality of needle bodies, each of which is fixedly disposed on the negative Poisson's ratio structure, and the needle body can be inserted and fixed on the Achilles tendon.

[0009] Optionally, the needle body has a drug coating on its surface;

[0010] Alternatively, the needle body has a receiving cavity, and the receiving cavity is used to store medicine.

[0011] Optionally, the negative Poisson's ratio structure has an implanted state, in which the negative Poisson's ratio structure encloses a wrapping cavity.

[0012] Optionally, the Achilles tendon support system includes a detector, which is arranged on the negative Poisson's ratio structure, and the detector is used to monitor the healing condition of the Achilles tendon in real time.

[0013] Optionally, the detector includes a power module, a thin film resistance sensor and a first wireless module;

[0014] The power module, the thin film resistance sensor and the first wireless module are all arranged in the negative Poisson's ratio structure;

[0015] The thin film resistance sensor is deformed along with the negative Poisson's ratio structure, and the resistance value of the thin film resistance sensor changes accordingly along with the deformation of the negative Poisson's ratio structure;

[0016] The power module is electrically connected to the thin film resistance sensor and the first wireless module. The first wireless module is connected to the thin film resistance sensor and is used to output data of the thin film resistance sensor.

[0017] Optionally, the detector includes a standard resistor and a detection circuit;

[0018] The power module, the first wireless module, the thin film resistance sensor and the standard resistor are all electrically connected to the detection circuit, and the standard resistor and the thin film resistance sensor are connected in series;

[0019] The first wireless module and the thin film resistor sensor are connected in parallel, and are used to output the voltage of the thin film resistor sensor;

[0020] The resistance of the thin film resistance sensor can be determined according to the voltage of the thin film resistance sensor, the resistance value of the standard resistor and the output voltage of the power module.

[0021] Optionally, the power module includes a piezoelectric elastomer, the piezoelectric elastomer is connected to the negative Poisson's ratio structure, the piezoelectric elastomer is deformed along with the negative Poisson's ratio structure and generates a piezoelectric potential, and the piezoelectric elastomer is electrically connected to the detection circuit.

[0022] Optionally, the power module further includes a rectifier bridge, a filter capacitor and a voltage stabilizer;

[0023] The rectifier bridge is electrically connected to the piezoelectric elastic body, the filter capacitor is connected to the rectifier bridge, and the voltage regulator is electrically connected to the filter capacitor;

[0024] The detection circuit is electrically connected to the voltage regulator.

[0025] Optionally, the Achilles tendon support system includes an external device having a second wireless module and a processor;

[0026] The second wireless module is electrically connected to the processor, and the second wireless module can wirelessly communicate with the first wireless module;

[0027] The processor can calculate the resistance value of the thin film resistance sensor according to the voltage signal of the thin film resistance sensor output by the first wireless module, and determine the stretching data of the Achilles tendon section according to the resistance value.

[0028] By adopting the above technical solution, the present application has the following beneficial effects:

[0029] The Achilles tendon support system provided by the present application adopts a negative Poisson's ratio structure, which becomes longer along the length direction of the Achilles tendon as the Achilles tendon stretches, and expands and deforms in the circumferential direction as the Achilles tendon stretches, matching the change in the cross-sectional area of ​​the Achilles tendon. The negative Poisson's ratio structure of the present application is sheet-shaped, thin in thickness, and is a patch structure, which has good fit with the Achilles tendon and is conducive to the repair of the Achilles tendon.

[0030] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0032] Figure 1 A schematic diagram showing a biomechanically adapted Achilles tendon stent system capable of monitoring the repair status provided by an embodiment of the present disclosure being implanted into a human body;

[0033] Figure 2 A schematic diagram showing a biomechanically adapted Achilles tendon stent system capable of monitoring the repair status provided by an embodiment of the present disclosure;

[0034] Figure 3 A schematic diagram showing the coordination structure of a thin-film resistor sensor, an NFC module, and a packaging layer of an Achilles tendon stent system that is biomechanically adapted and capable of monitoring the repair status provided by an embodiment of the present disclosure;

[0035] Figure 4 A schematic diagram of a biomechanically adapted Achilles tendon stent system capable of monitoring the repair status provided by an embodiment of the present disclosure is shown.

[0036] In the figure: 1. Negative Poisson's ratio structure; 11. Needle body; 2. Power module; 3. Thin film resistor sensor; 4. Packaging layer; 5. NFC module; 6. Achilles tendon.

[0037] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] See also Figures 1 to 4 As shown, an embodiment of the present application provides a biomechanically adapted Achilles tendon stent system capable of monitoring the repair status, comprising: a negative Poisson's ratio structure 1, wherein the negative Poisson's ratio structure 1 is in sheet form, and the negative Poisson's ratio structure 1 is used to fit and fix to the Achilles tendon 6 and cover the gap at the broken end of the Achilles tendon 6.

[0042] The Achilles tendon support system provided by the present application adopts a negative Poisson's ratio structure 1, which becomes longer along the length direction of the Achilles tendon 6 as the Achilles tendon 6 stretches, and expands and deforms in the circumferential direction as the Achilles tendon 6 stretches, matching the change in the cross-sectional area of ​​the Achilles tendon 6. The negative Poisson's ratio structure 1 of the present application is sheet-shaped, thin in thickness, and is a patch structure, which has good fit with the Achilles tendon 6 and is conducive to the rehabilitation of the Achilles tendon 6.

[0043] In some possible implementation schemes, the negative Poisson's ratio structure 1 carries microneedles. Specifically, the Achilles tendon stent system includes a plurality of needle bodies 11, each of which is fixedly disposed on the negative Poisson's ratio structure 1, and the needle body 11 can be inserted and fixed on the Achilles tendon 6. The needle body 11 can be an integral structure with the negative Poisson's ratio structure 1. Compared with the solution of suturing the Achilles tendon 6, the negative Poisson's ratio structure 1 and the Achilles tendon provided in the embodiment of the present application are connected by microneedles, and no serious scar formation will occur during the cross-section repair process of the Achilles tendon, and the cross-section of the Achilles tendon is beautiful and has better function. A large number of needle bodies 11 can be provided on one side of the negative Poisson's ratio structure 1 of the present application along the thickness direction, so as to be plugged into the Achilles tendon 6, so as to achieve a tight connection between the negative Poisson's ratio structure 1 and the Achilles tendon 6. By reasonably setting the density, length, diameter and other dimensions of the needle body 11, the negative Poisson's ratio structure 1 can be reliably and tightly assembled with the Achilles tendon 6. The Achilles tendon stent system of the present application can match the mechanical properties of the Achilles tendon through the design of structure and materials. Combined with the microneedle and wrapping design of the present application, it can replace clinical suture surgery and achieve mechanical fixation of Achilles tendon injury / rupture.

[0044] In some possible implementations, the needle body 11 can be loaded with drugs. After the needle body 11 pierces the Achilles tendon 6, the drugs can be directly released into the Achilles tendon tissue to promote the recovery of the Achilles tendon 6. The drugs can be growth factors, etc. The embodiment of the present application can realize the release of drugs in the body by loading drugs on the needle body, which is beneficial to promote the repair and regeneration of Achilles tendon tissue.

[0045] For example, the surface of the needle body 11 may have a drug coating, and the drug is attached to the surface of the needle body 11 by infiltration, spraying or piezoelectric inkjet printing technology. When the needle body 11 penetrates the skin, the coating dissolves and is released into the Achilles tendon tissue. For another example, the needle body 11 has a receiving cavity, and the receiving cavity is used to store the drug. The needle body 11 can penetrate the Achilles tendon 6 and achieve drug delivery through the internal channel.

[0046] In some possible implementations, the negative Poisson's ratio structure 1 has an implanted state, in which the negative Poisson's ratio structure 1 encloses a wrapping cavity. The wrapping cavity can be a closed cylindrical cavity, that is, the negative Poisson's ratio structure 1 extends around the Achilles tendon 6 to form a cylindrical body. The wrapping cavity can also be an unclosed cylindrical cavity, that is, the negative Poisson's ratio structure 1 can be an arc-shaped sheet attached to the Achilles tendon 6, and the two ends of the negative Poisson's ratio structure 1 along the circumference of the Achilles tendon are not connected.

[0047] The Achilles tendon has exogenous healing from peripheral tissues and endogenous healing of the Achilles tendon itself. Exogenous healing is mainly participated by circulating cells outside the Achilles tendon or cells from adjacent tissues such as paratenon muscles and epitenon. The collagen fibers produced by the proliferation of epitenon cells in the Achilles tendon are very disordered and cannot fully meet the physiological needs of the Achilles tendon. Excessive deposition of collagen matrix is ​​the main reason for the adhesion of the Achilles tendon to the surrounding tissues. Endogenous healing is completed by fibroblasts from the Achilles tendon substance, epithelium or endotenon. It is a self-healing method in which the Achilles tendon intrinsic cells divide, proliferate and secrete collagen. The collagen fibers are more mature and arranged more regularly than those secreted by epitenon cells. The direction is consistent with the original fiber direction of the Achilles tendon cells, and they interweave with each other to form a strong connection. Therefore, promoting endogenous healing and inhibiting exogenous healing are important ways to reduce Achilles tendon adhesion.

[0048] After the Achilles tendon is injured or operated on, the Achilles tendon is prone to Achilles tendon adhesion, that is, the Achilles tendon adheres to the surrounding tissues, which in turn affects the function of the muscles controlled by the Achilles tendon. The main manifestations are pain at the site of the disease and joint movement dysfunction, which is a common complication after Achilles tendon surgery. The occurrence of Achilles tendon adhesion is closely related to the healing process of the Achilles tendon. During the repair of Achilles tendon injury, undifferentiated mesenchymal cells gradually differentiate into superficial aponeurotic cells and intrinsic Achilles tendon cells. The formation of adhesion is mainly the result of an imbalance between endogenous and exogenous healing factors. Endogenous healing can prevent Achilles tendon adhesion, while exogenous healing is inevitable because exogenous healing involves the formation of new granulation tissue on the fracture surface of the Achilles tendon by the subcutaneous tissue and synovium of the Achilles tendon. As capillaries enter the fracture surface of the Achilles tendon, the granulation tissue stores collagen, which then generates collagen fibers and eventually forms scar tissue. In addition, the destruction of the blood supply and integrity of the Achilles tendon and the inflammatory response of the peritendinous tissue are also important causes of Achilles tendon adhesion.

[0049] Exogenous healing is fast, with many and messy fibers, which are prone to scarring, while endogenous healing is slow, with almost no difference between the healed fibers and the fibers before injury. In other words, excessive exogenous healing can easily lead to scarring, so the ratio of exogenous healing to endogenous healing should be controlled. The negative Poisson's ratio structure 1 of the present application is sleeved on the outside of the Achilles tendon 6 to wrap the Achilles tendon 6, which can effectively reduce the ratio of exogenous healing and effectively reduce the formation of scars.

[0050] In some possible implementations, the Achilles tendon stent system includes a detector, which is disposed in the negative Poisson's ratio structure 1, and the detector is used to monitor the tensile data of the Achilles tendon 6 cross section in real time, that is, to monitor the healing condition of the Achilles tendon in real time. The detector is disposed in the negative Poisson's ratio structure 1, that is, the detector is located inside the human body, and the detection result has a relatively high accuracy. Monitoring the tensile condition of the Achilles tendon 6 cross section can help evaluate the repair effect of the Achilles tendon 6, that is, the healing condition of the Achilles tendon. The Achilles tendon stent system of the embodiment of the present application can sense the deformation response of the Achilles tendon tissue by introducing a biosensor (detector) to monitor its repair status.

[0051] An implantable biocompatibility detector can be introduced on the negative Poisson's ratio structure 1, so that the detector can be attached to the negative Poisson's ratio structure 1 or the Achilles tendon 6 section to monitor the cross-section stretching during the repair process of the Achilles tendon 6 in real time, such as strain data, which can reflect the softness and hardness of the tissue. Since the introduction of batteries and wires will greatly reduce the biocompatibility of the negative Poisson's ratio structure 1, increase the volume of the detector and the contact area between the detector and the tissue, it will lead to a series of safety hazards, and a secondary surgery will be required to remove the device later. Therefore, the embodiment of the present application chooses to use a battery-free, wireless transmission detector.

[0052] Specifically, the detector includes a power module 2, a thin film resistor sensor 3 and a first wireless module. The power source is not a battery for storing electrical energy. The power module 2, the thin film resistor sensor 3 and the first wireless module are all arranged on the negative Poisson's ratio structure 1. The thin film resistor sensor 3 deforms with the negative Poisson's ratio structure 1. The resistance of the thin film resistor sensor 3 changes accordingly with the deformation of the negative Poisson's ratio structure 1. The power module 2 is electrically connected to the thin film resistor sensor 3 and the first wireless module. The first wireless module is connected to the thin film resistor sensor 3 and is used to output the data of the thin film resistor sensor 3. The tensile data of the Achilles tendon 6 section can be obtained through the data, and the data can be used to characterize the healing of the Achilles tendon. The tensile condition of the Achilles tendon section can be obtained through the change in the resistance value of the thin film resistor sensor 3, that is, the relative strain at the section. The relative strain-time curve at the Achilles tendon section can be used to monitor the healing of the Achilles tendon in real time in vivo. The maximum relative strain within a period of time and the rate of change of the relative strain can reflect the mechanical properties of the Achilles tendon.

[0053] The thin film resistor sensor 3 can be composed of a stretchable film that can detect the deformation of the contact material surface, and can detect the deformation of the contact surface. The thin film resistor sensor 3 can be a strain resistor sensor, which is made of gold sprayed on the surface of the substrate layer. Au becomes the electrode of the resistance strain sensor due to its unique advantages of ultra-high conductivity and high Young's modulus. Its sensing principle is based on the microcrack mechanism. When the rigid micro-patterned gold film is slightly strained, even if the strain is less than 1%, cracks will appear and significant resistance changes will occur. When metal is used as an electrode for strain sensors, the measurement principle is the resistance strain effect. When an external force acts on the metal, the metal will deform, and the size of the deformation directly causes the resistance to change. The calculation formula of the resistance strain effect is as follows: R = ρL / S, R is the output resistance of the strain electrode, ρ is the resistivity of the conductor, L is the length of the conductor, and S is the cross-sectional area of ​​the conductor. In practical applications, when a metal strain gauge is subjected to tension, its cross-sectional area S decreases, L increases accordingly, and the resistance increases accordingly. At the same time, as strain occurs, cracks gradually appear on the surface of the rigid micro-patterned gold film, and the conductive paths on the surface begin to break. The greater the tension, the more cracks there are, and the more breaks there are. When cracks appear, the top of the crack breaks first, and the vertical distance between the conductive layer at the bottom of the crack and the base material decreases. At the same time, the contact area at the bottom of the crack decreases, that is, the cross-sectional area decreases, resulting in a decrease in the conductive path in the sensor conductive material, so the output resistance of the sensor increases. The resistance value of the resistance sensor can be approximated to the resistance value of the thin film made by spraying gold on the surface of the base layer, and the resistance value of the gold film is greatly affected by the degree of surface stretching due to the microcrack mechanism. Therefore, the degree of stretching of the contact surface or the negative Poisson's ratio structure 1 can be reflected by the ratio of the change in resistance value ΔR to the resistance value R in the initial state ΔR / R.

[0054] The thin film resistor sensor 3 can directly contact the Achilles tendon cross section to directly monitor the Achilles tendon stretching data. The thin film resistor sensor 3 can also be only connected to the negative Poisson's ratio structure 1 to monitor the local deformation of the negative Poisson's ratio structure 1, thereby indirectly determining the Achilles tendon stretching deformation data at the corresponding position.

[0055] The thin film resistance sensor 3 can be arranged on any side of the negative Poisson's ratio structure 1 along the thickness direction. When the thin film resistance sensor 3 is located on the side of the Poisson's ratio structure away from the Achilles tendon 6, the thin film resistance sensor 3 will not interfere with the needle body 11. When the thin film resistance sensor 3 is located on the inner side of the negative Poisson's ratio structure 1, that is, on the side facing the Achilles tendon 6, the needle body 11 may not be arranged at the part of the negative Poisson's ratio structure 1 where the thin film resistance sensor 3 is arranged, so that the thin film resistance sensor 3 is conveniently arranged.

[0056] In some possible implementations, the negative Poisson's ratio structure 1 may have more hollow areas, which can facilitate the nutrient transmission of the Achilles tendon 6 from the surrounding tissues of the Achilles tendon 6. The negative Poisson's ratio structure 1 is composed of a plurality of repeated subunits, each of which is respectively attached to a different surface of the Achilles tendon 6, and the deformation of each subunit can reflect the deformation of the corresponding part of the Achilles tendon 6. The thin film resistor sensor 3 can be connected to one or several of the subunits to sense the deformation of the corresponding subunit. The thin film resistor sensor 3 can be set on a subunit close to the section of the Achilles tendon 6 to sense the tensile deformation data at the section of the Achilles tendon 6.

[0057] In some possible embodiments, combined with Figure 4 As shown, the detector includes a standard resistor and a detection circuit, the power module 2, the first wireless module (which can be an NFC module), the thin film resistor sensor 3 and the standard resistor are all electrically connected to the detection circuit, the standard resistor and the thin film resistor sensor 3 are connected in series, the first wireless module and the thin film resistor sensor 3 are connected in parallel, and are used to output the voltage of the thin film resistor sensor 3, wherein the resistance value of the standard resistor is a known value, the output voltage of the power module 2 is a fixed value, and the resistance of the thin film resistor sensor 3 can be determined according to the voltage of the thin film resistor sensor 3, the resistance value of the standard resistor and the output voltage of the power module 2. The stretching degree of the contact surface or the negative Poisson's ratio structure 1 can be reflected by the ratio ΔR / R of the change in the resistance value ΔR of the thin film resistor sensor 3 and the resistance value R in the initial state. The negative Poisson's ratio structure 1 has a good fit with the Achilles tendon 6 of the human body, and its stretching degree can reflect the stretching data of the Achilles tendon 6 section.

[0058] In some possible implementation schemes, the power module 2 includes a piezoelectric elastomer, which can provide electrical energy and power each module of the detector. Specifically: the piezoelectric elastomer is connected to the negative Poisson's ratio structure 1, the piezoelectric elastomer is deformed along with the negative Poisson's ratio structure 1, and a piezoelectric potential is generated, and the piezoelectric elastomer is electrically connected to the detection circuit. In the embodiment of the present application, there is no need to implant a battery into the human body, but the piezoelectric elastomer located on the negative Poisson's ratio structure 1 is used to generate an electric potential, thereby improving the biocompatibility of the Achilles tendon stent system. When the piezoelectric elastomer is deformed by an external force in a certain direction, polarization occurs inside and a piezoelectric potential is generated to power the detection circuit.

[0059] It should be noted that the thin film resistance sensor and the NFC module 5 can be encapsulated in the encapsulation layer 4, thereby simplifying the structure. The encapsulation layer 4 can be connected to the negative Poisson's ratio structure 1, and the thin film resistance sensor is connected to the encapsulation layer 4. The encapsulation layer 4 is elastic. When the encapsulation layer 4 is deformed with the negative Poisson's ratio structure 1, the thin film resistance sensor 3 is deformed with the negative Poisson's ratio structure 1, thereby changing the resistance value.

[0060] The first wireless module may use short-range wireless communication technology, which allows electronic devices to exchange wireless data within a very close distance (usually a few centimeters). For example, the first wireless module may be an NFC module 5. The embodiment of the present application does not require a separate design of the NFC module 5, which already has a very mature commercial model and design. It is only necessary to connect the NFC module 5 to the signal element (thin film resistor sensor 3) to be measured.

[0061] In some possible implementations, see Figure 4 As shown, the power module 2 also includes a rectifier bridge, a filter capacitor and a voltage stabilizer. The rectifier bridge is electrically connected to the piezoelectric elastomer, the filter capacitor is connected to the rectifier bridge, the voltage stabilizer is electrically connected to the filter capacitor, and the detection circuit is electrically connected to the voltage stabilizer.

[0062] The piezoelectric elastomer is the power supply part of the circuit, and can generate alternating current in the process of moving with the negative Poisson's ratio structure 1. The rectifier bridge is used to convert alternating current into direct current. The rectifier bridge is usually composed of four diodes and can be full-wave or half-wave rectifier. The filter capacitor is connected to the output end of the rectifier bridge to smooth the direct current and reduce the alternating current component. The voltage regulator is connected after the filter capacitor to stabilize the direct current voltage. The thin film resistor sensor 3 is connected to the output end of the voltage regulator. The standard resistor is connected in series with the thin film resistor sensor 3. The standard resistor and the thin film resistor sensor 3 form a voltage divider for measuring the resistance value of the thin film resistor sensor 3.

[0063] Specifically, the piezoelectric elastomer can generate electrical energy as the Achilles tendon 6 reciprocates, and the electrical energy generated by the piezoelectric elastomer is collected by the electrode layer on the piezoelectric elastomer. The alternating current generated by the piezoelectric elastomer is converted into direct current through a filtering circuit, and then a stable direct current is obtained through a voltage stabilizer. The DC voltage acts on the thin film resistor sensor 3 and a standard resistor. Through the resistor voltage divider effect, it is only necessary to obtain the voltage divider of the thin film resistor sensor 3 to obtain the resistance value of the thin film resistor sensor 3. Therefore, in the embodiment of the present application, the thin film resistor sensor 3 is combined with the NFC wireless module, and finally the resistance output of the thin film resistor sensor 3 is measured, and an image of ΔR / R0 and time t can be drawn, that is, a strain-time graph, which can reflect the softness and hardness of the tissue.

[0064] In some possible implementations, the Achilles tendon stent system includes an external device, which does not need to be implanted in the human body, and is located outside the human body. The external device has a second wireless module and a processor, and the second wireless module is electrically connected to the processor. The second wireless module can communicate wirelessly with the first wireless module, and the second wireless module can be an NFC reader, which can obtain the voltage data output by the NFC module 5. The processor can calculate the resistance value of the thin film resistance sensor 3 according to the voltage signal of the thin film resistance sensor 3 output by the first wireless module, and determine the tensile data of the Achilles tendon 6 section according to the resistance value.

[0065] In some possible implementation schemes, the structure of the Achilles tendon stent system provided in the embodiments of the present application for implantation in the human body can be made of degradable materials, so that after the Achilles tendon tissue is repaired, it can gradually degrade in the internal environment of the body. The degradation products can be absorbed or excreted from the body through the metabolic process and will not remain in the body as foreign matter, causing no secondary damage to human health.

[0066] For example, the NFC wireless module, piezoelectric elastomer, sensor of the detector and negative Poisson's ratio structure 1 used in the intelligent mechanical bionic support can all be made of degradable materials. The external unit does not need to be made of degradable materials.

[0067] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status, characterized in that: include: A negative Poisson's ratio structure is in sheet form and is used to fit and fix to the Achilles tendon and cover the gap at the end of the Achilles tendon.

2. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to claim 1, characterized in that: It comprises a plurality of needle bodies, each of which is fixedly arranged on the negative Poisson's ratio structure, and the needle body can be inserted and fixed on the Achilles tendon.

3. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to claim 2, characterized in that: The needle body surface has a drug coating; Alternatively, the needle body has a receiving cavity, and the receiving cavity is used to store medicine.

4. A biomechanically adapted, repair-status-monitorable Achilles tendon stent system according to claim 1, characterized in that: The negative Poisson's ratio structure has an implanted state, in which the negative Poisson's ratio structure encloses a wrapping cavity.

5. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to any one of claims 1 to 4, characterized in that: It comprises a detector, which is arranged on the negative Poisson's ratio structure and is used for real-time monitoring of the healing condition of the Achilles tendon.

6. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to claim 5, characterized in that: The detector includes a power module, a thin film resistor sensor and a first wireless module; The power module, the thin film resistance sensor and the first wireless module are all arranged in the negative Poisson's ratio structure; The thin film resistance sensor is deformed along with the negative Poisson's ratio structure, and the resistance value of the thin film resistance sensor changes accordingly along with the deformation of the negative Poisson's ratio structure; The power module is electrically connected to the thin film resistance sensor and the first wireless module. The first wireless module is connected to the thin film resistance sensor and is used to output data of the thin film resistance sensor.

7. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to claim 6, characterized in that: The detector includes a standard resistor and a detection circuit; The power module, the first wireless module, the thin film resistance sensor and the standard resistor are all electrically connected to the detection circuit, and the standard resistor and the thin film resistance sensor are connected in series; The first wireless module and the thin film resistor sensor are connected in parallel, and are used to output the voltage of the thin film resistor sensor; The resistance of the thin film resistance sensor can be determined according to the voltage of the thin film resistance sensor, the resistance value of the standard resistor and the output voltage of the power module.

8. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to claim 7, characterized in that: The power module includes a piezoelectric elastomer, which is connected to the negative Poisson's ratio structure. The piezoelectric elastomer is deformed along with the negative Poisson's ratio structure and generates a piezoelectric potential. The piezoelectric elastomer is electrically connected to the detection circuit.

9. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to claim 8, characterized in that: The power module also includes a rectifier bridge, a filter capacitor and a voltage stabilizer; The rectifier bridge is electrically connected to the piezoelectric elastic body, the filter capacitor is connected to the rectifier bridge, and the voltage regulator is electrically connected to the filter capacitor; The detection circuit is electrically connected to the voltage regulator.

10. A biomechanically adapted Achilles tendon stent system capable of monitoring the repair status according to any one of claims 6 to 9, characterized in that: The device comprises an external device, wherein the external device has a second wireless module and a processor; The second wireless module is electrically connected to the processor, and the second wireless module can wirelessly communicate with the first wireless module; The processor can calculate the resistance value of the thin film resistance sensor according to the voltage signal of the thin film resistance sensor output by the first wireless module, and determine the stretching data of the Achilles tendon section according to the resistance value.

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