Method for judging activity of intelligent orthopedic implant

Abstract

The present application relates to the field of orthopedic implants, in particular to an intelligent orthopedic implant and a system thereof, a monitoring method, an activity degree method and a dislocation judgment method, which realizes real-time and accurate judgment of the wear state of the orthopedic implant, and gives corresponding early warning according to the wear state of the orthopedic implant, greatly improves the use safety of the orthopedic implant, and can also monitor the activity degree of the implant in real time. The intelligent orthopedic implant comprises an implant body, a plurality of capacitor plates are arranged in the implant body, each capacitor plate corresponds to another capacitor plate, and the capacitance between the corresponding capacitor plates changes with the wear of the implant. An integrated module is arranged in the implant body, the integrated module comprises a MEMS unit, each capacitor plate is connected with the MEMS unit, and the MEMS unit is used for detecting the capacitance data between each pair of corresponding capacitor plates in real time. The present application is suitable for intelligent monitoring of orthopedic implants.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of orthopedic implants, in particular to a method for judging the activity of an intelligent orthopedic implant. BACKGROUND

[0002] Orthopedic implant products mainly include spine products, trauma products, artificial joint products, neurosurgery products (skull repair titanium mesh, skull bone plate), thoracic surgery products (such as sternal internal fixation implants, rib internal fixation implant products, etc.), etc. Common orthopedic implants include intervertebral fusion cages, orthopedic bone plates, orthopedic screw-rod fixation systems (such as posterior spinal pedicle screw fixation systems, anterior spinal screw-rod fixation systems, and various types), orthopedic nail-plate systems, hip joint prostheses, knee joint prostheses, artificial vertebral bodies, intramedullary nails, elbow joint prostheses, wrist joint prostheses, shoulder joint prostheses, ankle joint prostheses, screws, titanium mesh, orthopedic fixation needles, orthopedic fixation cables, orthopedic fixation rivet implants, orthopedic external fixation support implants (the nails and needles of the fixation support are implants, and the connecting rods are class 2 medical devices), orthopedic personalized custom implants, orthopedic tumor implant products, and orthopedic implant spacers. The types of orthopedic implants include but are not limited to the above-mentioned product types and categories.

[0003] After the orthopedic implant is implanted into the human body, during the patient's bone healing process or the patient's rehabilitation process, the orthopedic implant may exhibit failure conditions such as bending deformation, stress concentration, loosening, withdrawal, displacement, fracture, wear, dislocation, etc., resulting in, for example, fracture of bone plates, fracture and loosening of screws, and other surgical failures. In severe cases, a second revision surgery is often required. Existing orthopedic implants cannot self-monitor implant failure and cannot provide early warning of implant failure, which is a significant deficiency in current orthopedic implants.

[0004] Implant failure can be a cumulative process of micro-motion, stress concentration, etc. over a long period of time, such as loosening, deformation, displacement, retraction, fracture, etc. Implant failure can also be a momentary force exceeding the load of the implant, resulting in instantaneous loosening, deformation, displacement, retraction, fracture, etc.

[0005] For example, in the design of artificial joint products, the conformity and constraint of the joint counter surface are critical to the wear of the prosthetic joint surface. The higher the conformity of the joint surface, the larger the contact area, and the smaller the average stress borne by the prosthesis, which is conducive to reducing wear. In addition, the high constraint can reduce the sliding and rolling components during joint movement, which is also conducive to reducing wear. The destruction of the prosthetic joint surface caused by wear can make the joint lose its normal movement form, leading to uneven stress distribution and loosening. Moreover, bone resorption caused by wear debris can make the prosthesis lose bone support and accelerate loosening. Wear particles can have toxic reactions, immune reactions, cause bone resorption and aseptic loosening, trigger allergic reactions, local tumor formation, and possibly trigger systemic reactions.

[0006] (I) Prior art solutions and deficiencies:

[0007] Current joint wear measurement methods:

[0008] Current artificial joint wear measurement methods are divided into two categories: actual artificial joint prosthesis wear measurement and in vitro artificial joint prosthesis experimental wear measurement.

[0009] The detection of wear of the prosthesis implanted in the body mainly includes imaging detection (X-ray examination, CT tomography technology, nuclear magnetic resonance, etc. to realize the in-vivo medical examination of artificial joint wear) and detection of wear of the removed implanted prosthesis. With the development of computer technology, in the 1990s of last century, two-dimensional computer digital technology for measuring artificial joint wear gradually emerged. These methods are to digitize standard images to create femoral head and hip cup prosthesis models, and to accurately calculate the wear degree. For example, the image automatic analysis method proposed by Hardinge et al. in 1991 and the digital image edge detection method proposed by Shaver et al. in 1997 are such methods. Two-dimensional computer digital technology for measuring wear has the advantage of higher accuracy, but it is still a planar measurement method, and the operation is more troublesome, which is not convenient for clinical use. Soon after the emergence of two-dimensional computer digital technology, some people began to study three-dimensional computer measurement technology. In 1995, Devane et al. first proposed a three-dimensional measurement technology for polyethylene lining wear based on the metal acetabular base. Subsequently, in 1997, Martell and Berdian also proposed their computer three-dimensional digital measurement method. These methods mostly determine the wear condition through cross-sectional digital reconstruction, and it is reported that it has good repeatability and ten times the accuracy of Livermore method, but how to avoid the error in cross-sectional reconstruction still needs to be discussed. Moreover, this method is more complex and costly than planar measurement, and it is difficult to be clinically popularized. In addition to manual measurement and computer image digital measurement technology, some researchers also use radioactive stereoscopic measurement analysis method to evaluate the wear condition. This method was first proposed by Baldursson H in 1979. Since then, especially in the 1990s and 2000s, relevant methods have emerged in an endless stream. These methods use markers placed in the prosthesis, and at the same time, the prosthesis is photographed from 3 different angles, and then three-dimensional reconstruction is performed by digital technology to determine the wear condition. This method better avoids the cross-sectional reconstruction error of three-dimensional computer measurement technology, but its invasiveness, difficulty in operation, higher cost and risk also make it difficult to be popularized.

[0010] The measurement of wear in vitro artificial joint prosthesis experiment mainly includes: (1) weighing method; (2) geometric method; (3) coordinate measurement method; (4) optical interference method; (5) isotope tracking method; (6) empirical formula method. The weighing method is the most commonly used wear measurement method in the experimental stage of artificial joints so far, and the International Organization for Standardization has also made corresponding provisions for the standard measurement procedure of the weighing method. The characteristics of this method are: 1) this method obtains the overall wear amount, and cannot obtain the distribution details of the material worn off in various places of the prosthesis; 2) this method directly obtains the overall weight / mass of material wear, and the volume conversion is based on the material density of the prosthesis, but this constant changes due to the special working environment of the prosthesis, such as the absorption of lubricating fluid, thereby leading to a large error in the calculation of the wear volume. 3) Due to the creep effect of the material in the experiment, the volume calculation error of the material is caused, and currently there are measures to reduce this error, such as prosthesis stabilization, which gives the material enough time to recover after 48h or 72h. 4) With the continuous improvement of materials and their forming technology, the wear of the prosthesis is becoming smaller and smaller, making it more and more difficult to weigh, and currently the balance used has a resolution of 0.01mg or 0.1mg. For the weighing method of weighing the artificial joint wear debris collected, this method has the problem of difficult collection in addition to the above-mentioned problems, so it is relatively less used, and the size of the wear volume is generally obtained at the same time of the debris particle analysis. The geometric method is less studied, among the four geometric methods, the coordinate measurement method is a more general method and is suitable for modern processing and analysis means. The coordinate measurement method uses CMM to scan the three-dimensional coordinate data, and according to the scanned surface data, a digital CAD joint surface prototype can be established, and the wear of the artificial joint can be calculated. This method first scans the prosthesis before wear, constructs a digital CAD model, then wears the prosthesis, scans the CAD model data of the prosthesis after wear again, and compares the two.

[0011] The current measurement method and the deficiency of the joint prosthesis:

[0012] (1) The current joint prosthesis does not have the functions of automatic measurement, monitoring and early warning of wear, although the existing patent technology mentions that the implantation of a sensor module can realize the monitoring of wear, but it does not clarify which sensor and method can realize the monitoring of the wear of the prosthesis; at the same time, the implantation of the sensor module in the distal end of the tibial prosthesis is also difficult to realize the monitoring of the wear function from a technical point of view. In addition, the existing technology does not mention the early warning of wear and the method of how to reduce the occurrence of wear, and the technical solution not only includes measurement, monitoring, early warning, but also includes slowing down the progress of wear.

[0013] (2) In vitro artificial joint prosthesis experiment wear measurement method is more, but only suitable for prosthesis development stage in the laboratory to test the prosthesis, not suitable for in vivo detection.

[0014] (3) After implantation in the human body, the imaging detection (X-ray examination, CT tomography technology, nuclear magnetic resonance technology to realize the in vivo medical examination of artificial joint wear) method of joint prosthesis has low detection accuracy, large error, and cannot be detected and warned in real time, and often cannot early warning of early wear, only after detection and detection of early wear, can the causes and influencing factors of prosthesis wear be found, so as to remove and reduce part of the wear risk factors, improve the life of joint prosthesis and surgical efficacy; In vivo implantation of steel balls and other invasive surgical methods to detect wear, high surgical risk, invasive, difficult to promote, and also cannot be detected and warned in real time and early warning;

[0015] Therefore, in the prior art, there is still a lack of a joint prosthesis and method which can measure, monitor and warn wear,

[0016] Dislocation is a common complication after total hip arthroplasty (THA), second only to aseptic loosening. The incidence of dislocation varies greatly in the literature, ranging from 0.04% to 11%. Most dislocations occur within 3 months after surgery, i.e. most are early dislocations. Dislocation causes great pain and psychological burden to patients, and also causes great distress to orthopedic surgeons. In the United States, hip instability (dislocation) and mechanical loosening are the most common indications for total hip revision. A study reported that from 1998 to 2007, 1868 cases (4.76%) of postoperative dislocation occurred after 39,271 cases of total hip arthroplasty, of which the dislocation rate within 2 years after surgery was 3.84% (n=1506), and the dislocation rate within 2-10 years was 0.92% (n=362) (Arthur L. Malkani et al. The Journal of Arthroplasty Vol. 25 No. 6 Suppl. 1 2010); Dislocation caused by any reason after total hip arthroplasty, even if the reduction is successful, can affect the patient's later gait and the life of the joint prosthesis, and seriously affect the patient's quality of life. Maintaining the correct position of the affected limb of the patient and the correct postoperative rehabilitation treatment is the key to preventing dislocation after total hip arthroplasty.

[0017] Knee instability after total knee arthroplasty refers to the knee joint after total knee arthroplasty beyond the normal angle or leaving the original normal position when the knee joint is varus, hyperextension or flexion, or multi-directional instability. According to the position, it can be divided into extension instability, flexion instability, knee hyperflexion instability, multi-directional instability and semi-flexion instability. It can also be divided into symmetric instability and asymmetric instability according to whether the instability degree of the medial and lateral sides is symmetrical.

[0018] The prior art has the following deficiencies:

[0019] In the design of the prior art joint prosthesis, the dislocation, subluxation or instability of the joint prosthesis cannot be monitored in real time and early. After the patient has dislocation, he or she can only be found to have dislocation by going to the hospital for treatment due to pain and swelling. The doctor determines the position of the patient's prosthesis according to physical examination and radiological examination, and judges whether there is dislocation or instability. However, the prior art has the following deficiencies:

[0020] 1. The position of the patient's postoperative joint prosthesis cannot be monitored in real time and judged whether there is dislocation or instability. The joint prosthesis is in motion and is in a specific posture, and dislocation or instability can only be found in this state. There is a risk of missed diagnosis in a single examination during hospital follow-up, so a method for real-time monitoring is needed.

[0021] 2. The patient's joint instability or subluxation, dislocation cannot be found early, so the opportunity for early intervention and treatment is missed, which is not conducive to early detection and early treatment. The patient's joint dislocation or instability after surgery may be a cumulative process due to one or more reasons for a long time, or a dislocation formed by a transient force exceeding the load of the joint prosthesis. For a part of patients, the prosthesis is unstable, subluxated or dislocated, which is a gradual development process. Therefore, early detection of instability or subluxation is conducive to early treatment and intervention, thereby improving the efficacy.

[0022] 3. The existing joint prosthesis cannot intelligently identify and report joint instability or dislocation, and lacks self-monitoring function.

[0023] 4. The existing technical means has poor sensitivity and accuracy, and it is not easy to accurately identify and determine the joint prosthesis instability or mild subluxation.

[0024] 5. The existing method of evaluating joint stability through radiological examination has radiation hazards.

[0025] 6. The existing technical means cannot be monitored remotely. The patient needs to go to the hospital for multiple examinations, which has the risk of miswork, transportation, examination fee and other costs, and is not conducive to reducing the medical burden.

[0026] Therefore, the current orthopedic implant still needs an intelligent orthopedic implant design which can realize self-real-time remote intelligent monitoring, accurately judge the failure state of the implant, and give a warning according to the corresponding state. SUMMARY

[0027] The purpose of the present application is to provide an intelligent orthopedic implant and its system, monitoring, activity, and dislocation judgment method, which realizes real-time accurate judgment of the wear state of the orthopedic implant, and gives a corresponding warning prompt according to the wear state of the orthopedic implant, greatly improves the use safety of the orthopedic implant, and can also monitor the activity of the implant in real time.

[0028] The present application realizes the above-mentioned purpose by adopting the following technical scheme, an intelligent orthopedic implant, comprising an implant body, a plurality of capacitor plates are arranged inside the implant body, each capacitor plate corresponds to one another, and the capacitance between the corresponding capacitor plates changes accordingly with the movement of the implant.

[0029] Further, an integrated module is arranged inside the implant body, the integrated module comprises a MEMS unit, each capacitor plate is connected with a MEMS (Micro-Electro-Mechanical System) unit, and the MEMS unit is used for real-time detection of the capacitance data between each corresponding capacitor plate.

[0030] Further, the integrated module further comprises a communication unit, which is used for sending the capacitance data to an external terminal.

[0031] Further, the implant is an ankle joint prosthesis, the ankle joint prosthesis comprises a first prosthesis component and a second prosthesis component, and the first prosthesis component and the second prosthesis component are both non-metallic prosthesis components.

[0032] Further, a plurality of capacitor plates are arranged inside the first prosthesis component, and a plurality of capacitor plates are arranged inside the second prosthesis component.

[0033] Further, each capacitor plate inside the first prosthesis component corresponds to one another with each capacitor plate inside the second prosthesis component, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface of the first prosthesis component and the second prosthesis component.

[0034] Further, the implant is a shoulder joint prosthesis, the shoulder joint prosthesis comprises a non-metallic ball, a cup, and a lining.

[0035] Further, a plurality of capacitor plates are arranged inside the ball, and the plurality of capacitor plates are arranged below the contact surface of the ball and the lining.

[0036] Further, the cup interior is provided with a plurality of capacitor plates.

[0037] Further, each capacitor plate in the cup interior corresponds to each capacitor plate in the ball interior, and the capacitance between the corresponding capacitor plates increases as the liner and the ball surface wear.

[0038] Further, the liner is provided with a plurality of capacitor plates.

[0039] Further, each capacitor plate in the liner corresponds to each capacitor plate in the ball, and the capacitance between the corresponding capacitor plates increases as the liner and the ball contact surface wear.

[0040] Further, the implant is a hip joint prosthesis, which includes a non-metallic ball, a cup, and a liner.

[0041] Further, the ball of the hip joint prosthesis is provided with a plurality of capacitor plates, which are arranged below the ball and the liner contact surface.

[0042] Further, the cup of the hip joint prosthesis is provided with a plurality of capacitor plates.

[0043] Further, each capacitor plate in the cup of the hip joint prosthesis corresponds to each capacitor plate in the ball of the hip joint prosthesis, and the capacitance between the corresponding capacitor plates increases as the liner and the ball contact surface wear.

[0044] Further, the liner of the hip joint prosthesis is provided with a plurality of capacitor plates.

[0045] Further, each capacitor plate in the liner of the hip joint prosthesis corresponds to each capacitor plate in the ball of the hip joint prosthesis, and the capacitance between the corresponding capacitor plates increases as the liner and the ball contact surface of the hip joint prosthesis wear.

[0046] Further, the implant is a wrist joint prosthesis, which includes a non-metallic ball, a cup, and a liner.

[0047] Further, the ball of the wrist joint prosthesis is provided with a plurality of capacitor plates, which are arranged below the ball and the liner contact surface of the wrist joint prosthesis.

[0048] Further, the cup of the wrist joint prosthesis is provided with a plurality of capacitor plates.

[0049] Further, each of the plurality of capacitor plates inside the cup of the wrist joint prosthesis corresponds to one of the plurality of capacitor plates inside the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases as the contact surface between the liner and the ball of the wrist joint prosthesis wears.

[0050] Further, the liner of the wrist joint prosthesis has a plurality of capacitor plates inside.

[0051] Further, each of the plurality of capacitor plates inside the cup of the wrist joint prosthesis corresponds to one of the plurality of capacitor plates inside the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases as the contact surface between the liner and the ball of the wrist joint prosthesis wears.

[0052] Further, the implant is a knee joint prosthesis, the knee joint prosthesis comprising a non-metal femoral prosthesis component, a spacer, and a non-metal tibial prosthesis component.

[0053] Further, the femoral prosthesis component has a plurality of capacitor plates inside, and the spacer has a plurality of capacitor plates inside.

[0054] Further, each of the plurality of capacitor plates inside the spacer corresponds to one of the plurality of capacitor plates inside the femoral prosthesis component, and the capacitance between the corresponding capacitor plates increases as the contact surface between the spacer and the femoral prosthesis component wears.

[0055] Further, the tibial prosthesis component has a plurality of capacitor plates inside.

[0056] Further, each of the plurality of capacitor plates inside the tibial prosthesis component corresponds to one of the plurality of capacitor plates inside the spacer, and the capacitance between the corresponding capacitor plates increases as the contact surface between the spacer and the tibial prosthesis component wears.

[0057] Further, the implant is an intervertebral disc prosthesis, the intervertebral disc prosthesis comprising a first vertebral endplate, a second vertebral endplate, and a nucleus.

[0058] Further, the nucleus has a plurality of capacitor plates inside, the first vertebral endplate has a plurality of capacitor plates inside, and each of the plurality of capacitor plates inside the nucleus corresponds to one of the plurality of capacitor plates inside the first vertebral endplate, and the capacitance between the corresponding capacitor plates increases as the contact surface between the nucleus and the first vertebral endplate wears.

[0059] Further, the second vertebral endplate has a plurality of capacitor plates inside, and each of the plurality of capacitor plates inside the nucleus corresponds to one of the plurality of capacitor plates inside the second vertebral endplate, and the capacitance between the corresponding capacitor plates increases as the contact surface between the nucleus and the second vertebral endplate wears.

[0060] The intelligent orthopedic implant monitoring system comprises an intelligent terminal and the intelligent orthopedic implant, and the intelligent terminal is used for analyzing and warning the wear and activity of the implant according to the capacitance data.

[0061] The intelligent orthopedic implant monitoring method is applied to the intelligent orthopedic implant monitoring system, and comprises the following steps:

[0062] The capacitance data between each corresponding capacitor plate are monitored in real time, and if the capacitance between each corresponding capacitor plate increases, it is prompted that the implant is worn out.

[0063] If the capacitance between each corresponding capacitor plate is greater than a set threshold capacitance, a warning is given.

[0064] The intelligent orthopedic implant activity judgment method is applied to the intelligent orthopedic implant monitoring system, and comprises the following steps:

[0065] Each capacitor plate in the cup or liner is set as A1, A2, A3…An, and each capacitor plate in the ball is set as B1, B2, B3…Bn, A1, A2, A3…An correspond to B1, B2, B3…Bn one by one.

[0066] If each capacitor plate is arranged in the ball, the cup or the liner, when Ax corresponds to By, the activity of the implant is θ, n is an integer greater than or equal to 1.

[0067] The intelligent orthopedic implant dislocation judgment method is applied to the intelligent orthopedic implant monitoring system, and comprises the following steps:

[0068] The capacitance data between each corresponding capacitor plate are monitored in real time, and if the capacitance between each corresponding capacitor plate is less than a set second threshold capacitance, it is determined that the implant is dislocated, and a dislocation warning is given.

[0069] The present application sets a plurality of capacitor plates in the orthopedic implant, each capacitor plate corresponds to one another, the capacitance between the corresponding capacitor plates increases with the movement of the implant, the movement of the implant may cause the wear or dislocation of the implant, so that the distance between the corresponding capacitor plates will change, and the small change in distance will also cause the change in capacitance between the corresponding capacitor plates, the wear and dislocation of the implant are determined by the change in capacitance between the corresponding capacitor plates, which greatly improves the accuracy of the wear and dislocation judgment of the orthopedic implant, and prompts or warns according to the wear and dislocation degree, which greatly improves the safety of the orthopedic implant. BRIEF DESCRIPTION OF DRAWINGS

[0070] Figure 1 It is a schematic view of the ankle joint prosthesis structure.

[0071] Figure 2 is a schematic view of a shoulder joint prosthesis structure.

[0072] Figure 3 is a schematic view of a hip joint prosthesis structure.

[0073] Figure 4 is a schematic view of a wrist joint prosthesis structure.

[0074] Figure 5 is a schematic view of a knee joint prosthesis structure.

[0075] Figure 6 is a schematic view of an intervertebral disc prosthesis structure.

[0076] In the drawings, 1 is a first prosthesis component, 2 is a second prosthesis component, 3 is a ball, 4 is an inner liner, 5 is a cup, 6 is a femoral prosthesis component, 7 is a tibial prosthesis component, 8 is a spacer, 9 is a first vertebral surface, 10 is a second vertebral surface, 11 is a nucleus, 12 is a spherical bearing, 13 is a base, and 101 is a capacitor plate. DETAILED DESCRIPTION

[0077] The intelligent orthopedic implant comprises an implant body, a plurality of capacitor plates are arranged in the implant body, each capacitor plate corresponds to another capacitor plate, and the capacitance between the corresponding capacitor plates changes with the movement of the implant.

[0078] During the movement of the implant, implant wear and dislocation may occur, and the capacitance between the corresponding capacitor plates changes with the wear and dislocation of the implant.

[0079] The implant body is internally provided with an integrated module, the integrated module comprises a MEMS unit, each capacitor plate is connected with the MEMS unit, and the MEMS unit is used for detecting the capacitance data between each pair of corresponding capacitor plates in real time.

[0080] The capacitor plate and the MEMS unit are connected through a measurement lead, and each capacitor plate has a separate lead. The capacitance calculation formula between the corresponding capacitor plates is C = εS / 4πkd, where ε is the dielectric constant of the medium between the capacitor plates, S is the area of the capacitor plate, and d is the distance between the capacitor plates.

[0081] The integrated module further comprises a communication unit, which is used for sending the capacitance data to an external terminal.

[0082] The implant can be an ankle joint prosthesis, the ankle joint prosthesis comprises a first prosthesis component and a second prosthesis component, and the first prosthesis component and the second prosthesis component are both non-metallic prosthesis components.

[0083] The first prosthesis component is internally provided with a plurality of capacitor plates, and the second prosthesis component is internally provided with a plurality of capacitor plates.

[0084] Each capacitor plate in the first prosthesis component corresponds to each capacitor plate in the second prosthesis component, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the first prosthesis component and the second prosthesis component.

[0085] The implant can be a shoulder joint prosthesis comprising a non-metallic ball, a cup and a liner.

[0086] The ball is internally provided with a plurality of capacitor plates, and the plurality of capacitor plates are arranged below the contact surface between the ball and the liner.

[0087] The cup is internally provided with a plurality of capacitor plates, and each capacitor plate in the ball corresponds to each capacitor plate in the cup, and the capacitance between the corresponding capacitor plates increases with the wear of the surface of the liner and the ball.

[0088] The liner is internally provided with a plurality of capacitor plates, and each capacitor plate in the liner corresponds to each capacitor plate in the ball, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball.

[0089] The implant can be a hip joint prosthesis comprising a non-metallic ball, a cup and a liner.

[0090] The ball of the hip joint prosthesis is internally provided with a plurality of capacitor plates, and the plurality of capacitor plates are arranged below the contact surface between the ball and the liner.

[0091] The cup of the hip joint prosthesis is internally provided with a plurality of capacitor plates.

[0092] Each capacitor plate in the cup of the hip joint prosthesis corresponds to each capacitor plate in the ball of the hip joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball.

[0093] The liner of the hip joint prosthesis is internally provided with a plurality of capacitor plates, and each capacitor plate in the liner of the hip joint prosthesis corresponds to each capacitor plate in the ball of the hip joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the hip joint prosthesis.

[0094] The implant can be a wrist joint prosthesis comprising a non-metallic ball, a cup and a liner.

[0095] The ball of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, and the plurality of capacitor plates are arranged below the contact surface between the ball and the liner of the wrist joint prosthesis.

[0096] The cup of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, each capacitor plate in the cup of the wrist joint prosthesis corresponds to each capacitor plate in the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the wrist joint prosthesis.

[0097] The cup of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, each capacitor plate in the cup of the wrist joint prosthesis corresponds to each capacitor plate in the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the wrist joint prosthesis.

[0098] The implant can be a knee joint prosthesis, which includes a non-metal femoral prosthesis component, a spacer (i.e., an artificial meniscus), and a non-metal tibial prosthesis component.

[0099] The cup of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, each capacitor plate in the cup of the wrist joint prosthesis corresponds to each capacitor plate in the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the wrist joint prosthesis.

[0100] The cup of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, each capacitor plate in the cup of the wrist joint prosthesis corresponds to each capacitor plate in the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the wrist joint prosthesis.

[0101] The cup of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, each capacitor plate in the cup of the wrist joint prosthesis corresponds to each capacitor plate in the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the wrist joint prosthesis.

[0102] The implant can be a knee joint prosthesis, which includes a non-metal femoral prosthesis component, a spacer (i.e., an artificial meniscus), and a non-metal tibial prosthesis component.

[0103] The cup of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, each capacitor plate in the cup of the wrist joint prosthesis corresponds to each capacitor plate in the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the wrist joint prosthesis.

[0104] The cup of the wrist joint prosthesis is internally provided with a plurality of capacitor plates, each capacitor plate in the cup of the wrist joint prosthesis corresponds to each capacitor plate in the ball of the wrist joint prosthesis, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball of the wrist joint prosthesis.

[0105] The implant can be a knee joint prosthesis, which includes a non-metal femoral prosthesis component, a spacer (i.e., an artificial meniscus), and a non-metal tibial prosthesis component.

[0106] The intelligent orthopedic implant monitoring method is applied to the intelligent orthopedic implant monitoring system and comprises the following steps:

[0107] The capacitance data between each corresponding capacitor plate is monitored in real time. If the capacitance between each corresponding capacitor plate increases, it is prompted that the implant is worn out.

[0108] If the capacitance between each corresponding capacitor plate is greater than a set threshold capacitance, a warning is given.

[0109] The intelligent orthopedic implant activity judgment method is applied to the intelligent orthopedic implant monitoring system and comprises the following steps:

[0110] Each capacitor plate in the acetabulum or the liner is respectively A1, A2, A3…An, each capacitor plate in the ball is respectively B1, B2, B3…Bn, A1, A2, A3…An correspond to B1, B2, B3…Bn one by one.

[0111] If there are n capacitor plates in the ball, the acetabulum or the liner, when Ax corresponds to By, the activity of the implant is θ, n is an integer greater than or equal to 1.

[0112] The intelligent orthopedic implant dislocation judgment method is applied to the intelligent orthopedic implant monitoring system and comprises the following steps:

[0113] The capacitance data between each corresponding capacitor plate is monitored in real time. If the capacitance between each corresponding capacitor plate is less than a set second threshold capacitance, it is determined that the implant is dislocated, and a dislocation warning is given.

[0114] Embodiment 1: The implant is a hip joint prosthesis, and the capacitor plates and the integrated module are arranged in the hip joint prosthesis as shown in Figure 3 The hip joint prosthesis comprises a ball 3, an inner village 4 and an acetabulum 5. A plurality of capacitor plates are arranged inside the ball 3, which can be arranged inside the ball at a certain distance from the surface contacting the inner village 4. The capacitor plates inside the ball are arranged on a spherical arc with the same spherical center as the ball, and can be arranged at equal intervals. The capacitor plates can also be arranged at a distance according to the situation to avoid being worn out.

[0115] A plurality of capacitor plates are arranged inside the acetabulum 5 of the hip joint prosthesis, which are arranged on a spherical arc with the same spherical center as the ball. Each capacitor plate inside the acetabulum 5 corresponds to each capacitor plate in the ball one by one. The capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball.

[0116] A plurality of capacitor plates can also be arranged in the liner 4 of the hip joint prosthesis. Each capacitor plate in the liner 4 corresponds to each capacitor plate in the ball one by one. The capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the liner and the ball.

[0117] The integrated module is arranged in the ball, including the MEMS unit and the communication unit, the communication unit sends the capacitance data between each corresponding pair of capacitor plates to the intelligent terminal.

[0118] The intelligent terminal monitors the capacitance data between each corresponding pair of capacitor plates in real time, if the capacitance between each corresponding pair of capacitor plates increases, it is prompted that the hip joint prosthesis has wear;

[0119] If the capacitance between each corresponding pair of capacitor plates is greater than the set threshold capacitance, a warning is given.

[0120] Embodiment 2: The implant is a knee prosthesis, the structural schematic diagram is as Figure 5 , a non-metal femoral prosthesis assembly 6, a spacer (artificial meniscus) 8 and a non-metal tibial prosthesis assembly 7, and a patellar prosthesis assembly is located on the back of the femoral prosthesis assembly 6;

[0121] Femoral prosthesis assembly 6: connected with the end of the femur. It has a groove that allows the patellar assembly to smoothly slide up and down when the knee is bent and straightened.

[0122] Spacer (artificial meniscus) 8: The spacer is flat, with two metal and polyethylene (plastic) parts attached to the tibia. There is a stem inserted into the tibial prosthesis assembly to maintain stability. The plastic part, also known as the tibial spacer, acts as a buffer between the femoral prosthesis assembly 6 and the tibial prosthesis assembly 7.

[0123] Patellar assembly: This plastic piece is dome-shaped to match the shape of the patellar surface. Because the patella rests on the femur, the alignment of the patellar assembly and the femoral assembly is crucial for normal function. The patella is fixed by the quadriceps tendon and the patellar tendon.

[0124] The above components and spacers are usually fixed with bone cement, but some doctors use a cementless technique to help bone growth into the implant to increase stability. Cementless technology can be used for young, healthy, and strong bone structure around the knee joint in patients. Because bone cement will fall off, leading to loosening of the prosthesis, cementless knee replacement is less likely to loosen over time. Therefore, it is believed that cemented knee replacement is more suitable for older, less active patients.

[0125] Knee prosthesis can be divided into the following types according to the material:

[0126] Metal on plastic: The most common type of implant. It features a metal femoral component attached to a polyethylene plastic spacer that connects to the tibial component. The metals used are cobalt, chromium, titanium, zirconium and nickel. Metal on plastic is the least expensive implant and has the longest track record in terms of safety and implant longevity. However, plastic implants can have a problem with immune reactions triggered by tiny particles of wear from the spacer. This can cause bone to break down, leading to loosening and failure of the implant. Advances in manufacturing have greatly reduced the rate of wear of the plastic.

[0127] Ceramic on plastic: This type uses a ceramic femoral component instead of a metal one (or a metal one with a ceramic coating). It is also mounted on a plastic spacer. People who are sensitive to nickel in metal implants can opt for ceramic implants. Tiny particles of plastic from this implant can also cause immune reactions.

[0128] Ceramic on ceramic: Both the femoral and tibial components are made of ceramic. Ceramic components are the least likely to react with the body. However, ceramic joint implants make a squeaking sound when walking. In rare cases, they can shatter into pieces under heavy pressure and have to be removed through surgery.

[0129] Metal on metal: Both the femoral and tibial components are made of metal. In recent years, the use of metal-on-metal implants has decreased because of concerns that tiny amounts of metal can leak into the bloodstream. The metal comes from the chemical breakdown of the implant. All metal implants were originally designed for younger people to provide more durable joint replacements. But tiny amounts of metal can cause inflammation, pain, and even organ damage. Women of childbearing age cannot receive these implants because the effects on the fetus are unknown.

[0130] Metal-made prostheses have an impact on the capacitance between the capacitor plates, so the non-metal knee joint prosthesis adopted by the present application.

[0131] The way to set the capacitor plates and the integrated module in the non-metal knee joint prosthesis is as follows Figure 5 A plurality of capacitor plates 101 are arranged in the femoral prosthesis assembly 6, which can be arranged inside the femoral prosthesis assembly 6 at a certain distance from the surface of the femoral prosthesis assembly 6 in contact with the artificial meniscus 8, avoiding the wear of the capacitor plates, and the distance can also be set according to the situation.

[0132] A plurality of capacitor plates 101 are arranged inside the artificial meniscus 8, and each capacitor plate in the artificial meniscus 8 corresponds to each capacitor plate in the femoral prosthesis assembly 6 one by one. The capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the artificial meniscus and the femoral prosthesis assembly.

[0133] The tibial prosthesis assembly 7 can also be provided with multiple capacitor plates, each capacitor plate in the tibial prosthesis assembly 7 corresponding to each capacitor plate in the artificial meniscus 8 one by one, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the artificial meniscus and the tibial prosthesis assembly.

[0134] The integrated module is arranged in the artificial meniscus and includes a MEMS unit and a communication unit, and the communication unit sends the capacitance data between the corresponding capacitor plates to the intelligent terminal, and the intelligent terminal analyzes and warns the wear, dislocation and activity of the knee prosthesis according to the capacitance data.

[0135] The method for monitoring the wear of the knee prosthesis includes that the intelligent terminal monitors the capacitance data between the corresponding capacitor plates in real time, and if the capacitance between the corresponding capacitor plates increases, it is prompted that the knee prosthesis has wear.

[0136] If the capacitance between the corresponding capacitor plates is greater than a set threshold capacitance, a warning is given.

[0137] The method for judging the dislocation of the knee prosthesis includes that the capacitance data between the corresponding capacitor plates is monitored in real time, and if the capacitance of the corresponding capacitor plates is less than a set second threshold capacitance, it is determined that the knee has dislocation, and a dislocation warning is given.

[0138] Embodiment 3: The implant is an ankle prosthesis, and the capacitor plates and the integrated module are arranged in the ankle prosthesis in the manner as Figure 1 The first prosthesis assembly 1 is internally provided with multiple capacitor plates 101, which are arranged in the first prosthesis assembly 1 at a distance from the contact surface between the first prosthesis assembly 1 and the second prosthesis assembly 2, so as to avoid the capacitor plates being worn, which can be arranged according to the situation; the second prosthesis assembly is internally provided with multiple capacitor plates, which can be arranged internally at a distance from the contact surface between the second prosthesis assembly and the first prosthesis assembly; each capacitor plate in the first prosthesis assembly corresponds to each capacitor plate in the second prosthesis one by one, and the first prosthesis assembly can be completely attached to the second prosthesis assembly.

[0139] The integrated module is arranged in the first prosthesis assembly and includes a MEMS unit and a communication unit, and the capacitor plates and the MEMS unit are connected through measurement leads, wherein each capacitor plate has a separate lead. The capacitance calculation formula between the corresponding capacitor plates is C = εS / 4πkd, wherein ε is the dielectric constant of the medium between the capacitor plates, S is the area of the capacitor plate, and d is the distance between the capacitor plates. As can be seen, when the distance between the capacitor plates decreases, the capacitance between the capacitor plates increases, so when the contact surface between the first prosthesis assembly and the second prosthesis assembly is worn, the distance between the corresponding capacitor plates will decrease, and the corresponding capacitance will increase.

[0140] The communication unit sends the capacitance data between the corresponding capacitor plates to the intelligent terminal.

[0141] The intelligent terminal monitors the capacitance data between each corresponding pair of capacitor plates in real time. If the capacitance between each corresponding pair of capacitor plates increases, it indicates that the ankle prosthesis has worn out.

[0142] If the capacitance between each corresponding pair of capacitor plates is greater than a set threshold capacitance, a warning is given.

[0143] In Embodiment 4, the implant is a shoulder prosthesis, and the capacitor plates and integrated module are arranged in the shoulder prosthesis as shown in Figure 2 The shoulder prosthesis includes a ball 3, an inner race 4, and a cup 5. The ball 3 has a plurality of capacitor plates arranged inside the ball at a distance from the surface of the ball that contacts the inner race 4. The capacitor plates in the ball are arranged on a spherical arc with the same center as the ball, and can be arranged at equal intervals. The capacitor plates are arranged to avoid being worn out, and the distance can also be arranged according to the situation.

[0144] The cup 5 has a plurality of capacitor plates arranged inside the cup on a spherical arc with the same center as the ball. Each capacitor plate in the cup corresponds to each capacitor plate in the ball. The capacitance between the corresponding capacitor plates increases as the inner race wears out.

[0145] The inner race 4 can also have a plurality of capacitor plates. Each capacitor plate in the inner race corresponds to each capacitor plate in the ball. The capacitance between the corresponding capacitor plates increases as the inner race wears out.

[0146] The integrated module is arranged in the ball and includes a MEMS unit and a communication unit. The communication unit sends the capacitance data between each corresponding pair of capacitor plates to the intelligent terminal.

[0147] The intelligent terminal monitors the capacitance data between each corresponding pair of capacitor plates in real time. If the capacitance between each corresponding pair of capacitor plates increases, it indicates that the shoulder prosthesis has worn out.

[0148] If the capacitance between each corresponding pair of capacitor plates is greater than a set threshold capacitance, a warning is given.

[0149] When determining the range of motion of the shoulder prosthesis, each capacitor plate in the cup 5 is arranged as A1, A2, A3…An, and each capacitor plate in the ball 3 is arranged as B1, B2, B3…Bn. Each A1, A2, A3…An corresponds to each B1, B2, B3…Bn. If there are 18 capacitor plates in the ball 3 and the cup 5, when Ax corresponds to By, the corresponding range of motion can be determined according to Table 1.

[0150] Table 1: Range of motion evaluation criteria for shoulder prosthesis

[0151] A1 A2 … A9 … A17 A18 B1 0° 10° … 80° 160° 170° B2 -10° 0° … 70° 150° 160° … … … … … … B9 -80° -70° … 0° 80° 90° … … … … … … … … B17 -160° -150° -80° … 0° -10° B18 -170° -160° -90° … -10° 0°

[0152] The angle calculation formula is: n is an integer greater than or equal to 1.

[0153] During the movement of the shoulder joint prosthesis, the situation of dislocation of the shoulder joint prosthesis can also occur, for example, dislocation of the shoulder joint prosthesis ball 3 and the inner liner 4, at this time the distance between the corresponding capacitor plates in the ball 3 and the inner liner 4 will increase, and the corresponding capacitance will be smaller, when the capacitance of each corresponding capacitor plate is smaller than the set second threshold capacitance, it is determined that the implant has dislocation, and dislocation warning is performed.

[0154] Example 5: The implant is an intervertebral disc prosthesis.

[0155] Artificial intervertebral disc prostheses aim to replace the movement and cushioning functions of damaged intervertebral discs. There is a moderate degree of variation, mainly in the variable bearing design, materials, implantation techniques, and joint type. There are three different types of bearing designs: constrained, semi-constrained, and unconstrained.

[0156] Artificial intervertebral disc prostheses mainly include three-component prostheses and two-component prostheses.

[0157] One of the intervertebral disc prostheses with 3 components includes a movable biconvex nucleus (nucleus pulposus) that can be connected through 2 spherical bearings (ball and socket joints). The degree of freedom of movement is determined by the joint properties of the bearing surfaces. A 3-component prosthesis with 2 joint bearings can have. A prosthesis with an incompressible core has 2 degrees of freedom in the sagittal plane and the coronal plane, respectively.

[0158] Another example of a prosthesis with 3 joint components and 2 bearings is the Mobi-C cervical intervertebral disc. A 3-component prosthesis with a biconvex movable core will allow 3 independent angular movements (flexion-extension, lateral bending, and axial rotation). Together with 2 independent translations (anterior-posterior and lateral), there are 5 degrees of freedom. The only missing degree of freedom is the ability to compress along the superior-inferior axis of the intervertebral disc.

[0159] The Secure-C type intervertebral disc prosthesis has a movable core, which allows 2 degrees of freedom of movement in the sagittal plane. On the coronal plane, only angular movement of lateral bending at the superior spherical joint with freedom = 1 is allowed. The secure-c prosthesis allows 3 independent angular movements (flexion-extension, lateral bending, and axial rotation) and 1 independent anterior-posterior translation, resulting in a total of 4 degrees of freedom.

[0160] Two-component prosthesis: A prosthesis has two joint components and a spherical bearing (ball and socket joint), and has 3 degrees of freedom because it can only allow 3 independent angular movements. It is not possible to have translational movement between the two components if the conformal bearing surfaces remain in full contact during the movement arc.

[0161] Saddle joints allow independent angular motion in orthogonal planes, such as flexion-extension and lateral bending (2 degrees of freedom).

[0162] Ball-and-socket joints allow 3 independent angular motions and translation of the flexion-extension angular motion in the sagittal plane. Thus, a prosthesis with a ball-and-socket joint has 4 degrees of freedom.

[0163] There are three main materials for intervertebral disc prostheses: stainless steel, cobalt, and titanium. Stainless steel is rarely used because it limits the use of magnetic resonance. Cobalt and titanium are the most commonly used because of their high long-term success rate in other joint replacement devices. Surface features include keels, spikes, wire mesh, increased porosity, screw fixation, and special coatings of titanium, aluminum oxide, hydroxyapatite, and calcium phosphate, which are often used strategies. Joint types are defined according to the number of current centers of rotation.

[0164] Artificial intervertebral disc prostheses come in many different shapes and sizes, but current designs are divided into four types: composite, hydraulic, elastic, and mechanical intervertebral discs.

[0165] (1) Composite: Composite artificial intervertebral discs are composed of several parts, usually two metal endplates with a polyethylene (plastic) spacer in between.

[0166] (2) Hydraulic: Hydraulic artificial intervertebral discs contain a dehydrated core that is implanted in a compressed state. Hydraulic artificial intervertebral discs provide space and flexibility between the vertebral bodies.

[0167] (3) Elastic: Elastic artificial intervertebral discs, similar to composite artificial intervertebral discs, are made of two materials; however, the core of the elastic artificial intervertebral disc is a polycarbonate urethane between two metal plates, rather than a plastic core. The central core is "deformable" and aims to mimic the natural viscoelastic properties of the intervertebral disc.

[0168] (4) Mechanical: Mechanical artificial discs are usually composed of two connecting components, all of which are the same material (such as metal) or a composite of metal and ceramic.

[0169] One structural implementation of an intervertebral disc prosthesis is shown in Figure 6 comprising a first vertebral face 9, a second vertebral face 10, and a nucleus 11 comprising a convex movable spherical bearing 12 and a base 13, the nucleus 11 being connected to the first vertebral face by the spherical bearing 12 and to the second vertebral face by the base 13.

[0170] The plurality of capacitor plates are arranged in the nucleus 11, which can be arranged inside a certain distance from the contact surface of the spherical bearing 12 and the first vertebral surface 9, and the purpose is to prevent the capacitor plates from being worn, which can be arranged according to the situation; the plurality of capacitor plates are arranged in the first vertebral surface 9, and each capacitor plate inside the nucleus corresponds to each capacitor plate inside the first vertebral surface one by one, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the nucleus and the first vertebral surface.

[0171] The plurality of capacitor plates are arranged in the second vertebral surface, and each capacitor plate inside the nucleus corresponds to each capacitor plate inside the second vertebral surface one by one, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the nucleus and the second vertebral surface.

[0172] The integrated module can be arranged in the spherical bearing 12 or the vertebral surface, including a MEMS unit and a communication unit, and the capacitor plates are connected to the MEMS unit through measurement leads, wherein each capacitor plate has a separate lead.

[0173] The communication unit sends the capacitance data between each pair of corresponding capacitor plates to the intelligent terminal, and the intelligent terminal analyzes and warns the wear, dislocation, and activity of the intervertebral disc prosthesis according to the capacitance data.

[0174] The method for monitoring the wear of the intervertebral disc prosthesis includes: the intelligent terminal monitors the capacitance data between each pair of corresponding capacitor plates in real time, and if the capacitance between each pair of corresponding capacitor plates increases, it is prompted that the intervertebral disc prosthesis has appeared wear;

[0175] If the capacitance between each pair of corresponding capacitor plates is greater than a set threshold capacitance, a warning is given.

[0176] The method for judging the dislocation of the intervertebral disc prosthesis includes: the capacitance data between each pair of corresponding capacitor plates is monitored in real time, and if the capacitance of each pair of corresponding capacitor plates is less than a set second threshold capacitance, it is determined that the intervertebral disc prosthesis has appeared dislocation, and a dislocation warning is given.

[0177] Embodiment 6: The implant is a wrist joint prosthesis, and the way of arranging the capacitor plates and the integrated module in the wrist joint prosthesis is as shown in Figure 4 The wrist joint prosthesis includes a ball 3, an inner village 4, and a socket 5, a plurality of capacitor plates are arranged inside the ball 3, which can be arranged inside the ball at a certain distance from the surface in contact with the inner village 4, and the capacitor plates inside the ball are arranged on a spherical arc with the same spherical center as the ball, and can be arranged at equal intervals. The distance can also be arranged according to the situation.

[0178] A plurality of capacitor plates are arranged inside the socket 5 of the hip joint prosthesis, and the arrangement is on a spherical arc with the same spherical center as the ball, and each capacitor plate inside the socket 5 corresponds to each capacitor plate in the ball one by one, and the capacitance between the corresponding capacitor plates increases with the wear of the contact surface between the inner lining and the ball.

[0179] A plurality of capacitor plates can also be arranged in the inner liner 4 of the hip joint prosthesis, each capacitor plate in the inner liner 4 corresponding to each capacitor plate in the ball one by one, and the capacitance between the corresponding capacitor plates increasing with the wear of the contact surface between the inner liner and the ball.

[0180] The integrated module is arranged in the ball and includes a MEMS unit and a communication unit, and the communication unit sends the capacitance data between each corresponding capacitor plate to the intelligent terminal.

[0181] The intelligent terminal monitors the capacitance data between each corresponding capacitor plate in real time, and if the capacitance between each corresponding capacitor plate increases, it is prompted that the wrist joint prosthesis has worn out.

[0182] If the capacitance between each corresponding capacitor plate is greater than a set threshold capacitance, a warning is given.

[0183] It can be understood that the present application includes but is not limited to the above-mentioned embodiments, and any orthopedic implant that uses capacitor plates to determine the wear or dislocation of the orthopedic implant body is within the scope of the present application.

[0184] The benefits and effects achieved by the present application are as follows:

[0185] The implant prosthesis wear, dislocation, and range of motion can be monitored in real time, and real-time corresponding warning prompts can be given.

[0186] Early detection and warning of wear can help clinicians and patients find the causes and triggers of wear, thereby removing or reducing aggravating factors of wear and reducing complications such as joint prosthesis periprosthetic bone resorption, osteolysis, and aseptic loosening of the joint, thereby improving the service life of the prosthesis and the effectiveness of joint replacement, avoiding and reducing revision surgery, benefiting patients, and reducing the social health and economic burden.

[0187] Real-time, non-invasive, and accurate monitoring of wear can be achieved without invasive surgical procedures.

[0188] There is no need for repeated exposure to radiation, greatly reducing the risk of radiation.

[0189] In summary, the present application realizes real-time and accurate determination of the wear, dislocation, and activity of the orthopedic implant, and gives corresponding warning prompts, discovers and handles problems in a timely manner, effectively avoids the deterioration of the patient's condition caused by the wear or dislocation of the implant, thereby avoiding secondary surgery for the patient, greatly improving the safety of the orthopedic implant, and also recording the range of motion of the implant in real time, greatly improving the flexibility of the implant.

Claims

1. A method for determining the mobility of intelligent orthopedic implants, applied to an intelligent orthopedic implant monitoring system including intelligent orthopedic implants and an intelligent terminal, wherein the intelligent orthopedic implant includes an implant body, characterized in that, The implant body has multiple capacitor plates inside, and each capacitor plate corresponds to another capacitor plate. The capacitance between the corresponding capacitor plates changes accordingly with the movement of the implant. The smart terminal is used to analyze and warn about the wear, dislocation and mobility of the implant based on the capacitance data. The implant is a shoulder joint prosthesis, a hip joint prosthesis, or a wrist joint prosthesis, and the shoulder joint prosthesis, hip joint prosthesis, or wrist joint prosthesis includes a non-metallic ball, an acetabular cup, and an inner liner. The sphere is provided with multiple capacitor plates inside, which are located below the contact surface between the sphere and the liner. The mortar or liner is provided with multiple capacitor plates inside, and each capacitor plate inside the sphere corresponds one-to-one with each capacitor plate inside the mortar or liner. The capacitance between the corresponding capacitor plates increases with the wear of the liner and the surface of the sphere. The capacitor plates in the mortar or liner are designated as A1, A2, A3...An, and the capacitor plates in the sphere are designated as B1, B2, B3...Bn, with A1, A2, A3...An corresponding one-to-one with B1, B2, B3...Bn. If each of the sphere, acetabular cup, or liner contains n capacitor plates, then when Ax corresponds to By, the degree of mobility of the implant is θ. x = 1, 2, ..., n, y = 1, 2, ..., n, where n is an integer greater than or equal to 1.

2. The method for judging the mobility of intelligent orthopedic implants according to claim 1, characterized in that, The implant body has an integrated module inside, which includes a MEMS unit. Each capacitor plate is connected to the MEMS unit, and the MEMS unit is used to detect the capacitance data between the corresponding capacitor plates in real time.

3. The method for judging the mobility of intelligent orthopedic implants according to claim 2, characterized in that, The integrated module also includes a communication unit, which is used to send capacitance data to an external terminal.

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