CN218979349U - System for monitoring joint replacement performance - Google Patents

Abstract

The utility model relates to a system for monitoring the performance of a joint replacement, comprising a measuring assembly and a circuit assembly, the measuring assembly being connected with the circuit assembly; the measuring assembly includes a sensor; the circuit component comprises a sensor control unit, a signal conversion unit, an acquisition filter unit, an analog-digital conversion unit, a data processing unit and a radio frequency communication unit; the sensor control unit is connected with the sensor, the input end of the signal conversion unit is connected with the sensor control unit, the output end of the signal conversion unit is connected with the input end of the acquisition filter unit, the output end of the acquisition filter unit is connected with the input end of the analog-digital conversion unit, the output end of the analog-digital conversion unit is connected with the data processing unit, and the input end of the radio frequency communication unit is connected with the data processing unit. The utility model solves the problem that the performance parameters of the joint replacement can not be monitored in the operation in the prior art.

Description

System for monitoring joint replacement performance

Technical Field

The present utility model relates to the field of medical devices, and more particularly to a system for monitoring the performance of joint replacements.

Background

Currently, the clinical treatment methods for knee arthritis mainly comprise non-operative treatment and operative treatment. The non-operative treatment is also a conservative treatment, and mainly comprises physiotherapy, traditional Chinese medicine, drug treatment and the like. Methods of surgical treatment mainly include knee arthroscopic exploratory clearance (i.e., arthroscopic surgery) and knee arthroplasty. Arthroscopy is mainly used for early and middle stages of arthropathy, and joint replacement is used for advanced symptoms such as severe joint abrasion, obvious narrowing of joint gaps, knee joint deformation and the like. Knee joint replacement is a treatment method for removing a joint surface which cannot be repaired by oneself by cutting off a body, replacing a damaged joint with an artificial joint part, correcting a limb force line, eliminating knee joint pain, maintaining joint stability, and restoring knee joint function. The service life of the implanted knee joint prosthesis is generally about 20 years, if the knee joint prosthesis is well protected, the knee joint prosthesis can be used for a longer time, basically no operation is needed again, and a patient can complete basic life self-care after one week of operation. Thus, knee arthroplasty is currently an ideal solution for patients with advanced knee inflammatory conditions.

Total Knee Arthroplasty (TKA) is an effective method for treating advanced knee osteoarthritis, with the goal of alleviating pain, correcting deformity, and improving function. TKA mainly replaces the femoral condyle, tibial plateau, meniscus, patella (most of china does not replace the patella). TKA targets remodel the normal force lines of the lower limb and achieve medial-lateral and flexion-extension gap balance. Good lower limb force lines can be realized through a computer navigation technology at present. The balance of the bending and stretching gap is the balance of the knee bending gap of the knee stretching, namely the distance between the fingers and the knee stretching is equal to the distance between the knee bending; while the medial-lateral balance refers to soft tissue balance. Aiming at the balance of the inner side, the outer side and the bending and stretching gap, the traditional method is to achieve the balance of the inner chamber, the outer chamber and the stretching chamber by mechanical test die, traction or tensioning.

At present, after the joint replacement is implanted, the balance of the knee joint is realized mostly by experience and hand feeling of doctors, and the performance parameters of the joint replacement cannot be monitored in operation.

Aiming at the problem that the performance parameters of the joint replacement can not be monitored in operation in the prior art, no effective solution is proposed at present.

Disclosure of Invention

In view of the foregoing, there is a need for a system for monitoring the performance of a joint replacement that solves the problem of the prior art that the performance parameters of a joint replacement cannot be monitored intraoperatively.

The utility model provides a system for monitoring the performance of a joint replacement, which comprises a measuring component and a circuit component, wherein the measuring component is connected with the circuit component;

the measuring assembly includes a sensor;

the circuit component comprises a sensor control unit, a signal conversion unit, an acquisition filter unit, an analog-digital conversion unit, a data processing unit and a radio frequency communication unit;

the sensor control unit is connected with the sensor, the input end of the signal conversion unit is connected with the sensor control unit, the output end of the signal conversion unit is connected with the input end of the acquisition filter unit, the output end of the acquisition filter unit is connected with the input end of the analog-digital conversion unit, the output end of the analog-digital conversion unit is connected with the data processing unit, and the input end of the radio frequency communication unit is connected with the data processing unit.

In one embodiment, the measurement assembly includes a pressure sensor including a plurality of sensing elements symmetrically disposed on medial and lateral sides of the tibial prosthesis of the joint replacement.

In one embodiment, the circuit assembly further comprises a reference source unit, the reference source unit being connected to the signal conversion unit.

In one embodiment, the signal conversion unit is a current-to-voltage converter, a capacitor-to-voltage converter, or a resistor-to-voltage converter.

In one embodiment, the measurement assembly is disposed between the polyethylene spacer of the joint replacement and the tibial prosthesis of the joint replacement;

alternatively, the measurement assembly is disposed on the upper surface of the polyethylene spacer of the joint replacement;

alternatively, the measurement assembly is disposed on a side of the tibial prosthesis of the joint replacement;

alternatively, the measurement assembly is disposed on the side of the polyethylene spacer of the joint replacement;

alternatively, the measurement assembly is disposed in an extension of the tibial prosthesis of the joint replacement.

In one embodiment, the circuit assembly is disposed on a side of a polyethylene spacer of the joint replacement;

and/or the circuit assembly is disposed on a side of the tibial prosthesis of the joint replacement;

and/or the circuit assembly is disposed in an extension of the tibial prosthesis of the joint replacement;

and/or the circuit assembly is arranged outside the human body.

In one embodiment, the system further comprises a circuit protection component disposed within the circuit protection component, the circuit protection component being made of a biocompatible material.

In one embodiment, the circuit protection component is a cuboid cavity shell, the circuit component is arranged in the cuboid cavity shell, the measurement component is arranged outside the cuboid cavity shell, and the circuit component is connected with the measurement component through a pluggable interface lead.

In one embodiment, the circuit protection component is an annular strip within which the circuit component and the measurement component are enclosed.

In one embodiment, the system further comprises a display unit, which is in radio connection with the radio frequency communication unit.

According to the system for monitoring the performance of the joint replacement, the sensor is arranged in the joint replacement, the pressure value and the balance parameter of the joint replacement are measured, the parameter is transmitted to the circuit component for corresponding signal processing, and then transmitted to the external display device through the radio frequency communication unit of the circuit component, so that a user can evaluate the pressure value and the balance index of the joint replacement or the artificial prosthesis in an operation, the condition of the prosthesis and the normal working condition can be judged in an auxiliary manner, and the problem that the performance parameter of the joint replacement cannot be monitored in the operation in the prior art is solved.

Drawings

FIG. 1 is a schematic diagram of a system for monitoring joint replacement performance according to the present embodiment;

FIG. 2 is a schematic diagram of a circuit assembly according to the present embodiment;

FIG. 3 is a schematic view of a measuring assembly of the present embodiment;

fig. 4 is a schematic structural diagram of an acquisition filter unit in the present embodiment;

fig. 5 is a schematic diagram of a circuit configuration of digital signal processing according to the present embodiment;

fig. 6 is a schematic structural diagram of a radio frequency communication unit according to the present embodiment;

FIG. 7 is a schematic diagram of a shunt reference voltage source according to the present embodiment;

FIG. 8 is a schematic diagram of a series reference voltage source according to the present embodiment;

FIG. 9 is a schematic diagram of a bandgap reference voltage source according to the present embodiment;

fig. 10 is another system for monitoring joint replacement performance according to the present embodiment.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

It will be understood that when an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present utility model provides a system for monitoring the performance of a joint replacement, the system comprising a measurement assembly 101 and a circuit assembly 102, the measurement assembly 101 being disposed in the joint replacement, the measurement assembly 101 being connected to the circuit assembly 102. The measurement assembly 101 includes a sensor 103. The sensor 103 of the measurement assembly 101 is located between the polyethylene spacer 105 of the joint replacement and the tibial prosthesis 106, and the circuit assembly 102 is located outside the body, remote from the implant, with the measurement assembly 101 and the circuit assembly 102 being connected by a pluggable interface lead 104. The system also includes a circuit protection component within which the circuit component 102 is disposed, the circuit protection component being made of a biocompatible material. As shown in fig. 1, the circuit protection component may be a circuit protection housing 107, the measurement component 101 is disposed outside the circuit protection housing 107, and the circuit component 102 is disposed inside the circuit protection housing 107.

The circuit assembly 102 includes: the sensor control unit 301, the signal conversion unit 302, the acquisition filter unit 303, the analog-to-digital conversion unit 304, the data processing unit 305 and the radio frequency communication unit 306.

The sensor control unit 301 is connected with the sensor 103, the input end of the signal conversion unit 302 is connected with the sensor control unit 301, the output end of the signal conversion unit 302 is connected with the input end of the acquisition filter unit 303, the output end of the acquisition filter unit 303 is connected with the input end of the analog-digital conversion unit 304, the output end of the analog-digital conversion unit 304 is connected with the data processing unit 305, the input end of the radio frequency communication unit 306 is connected with the data processing unit 305, and the circuit assembly 102 transmits signals to an external display device through the radio frequency communication unit 306.

Specifically, the sensor control unit 301 controls the sensor 103 to collect a signal, and the signal conversion unit 302 converts the collected signal into a voltage signal. The voltage signal is amplified, filtered and integrated by the acquisition and filtering unit 303, and then converted into a digital signal by the analog-digital conversion unit 304, the digital signal is input to the data processing unit 305 for digital information filtering and storage, and the processed digital signal is transmitted to an external display device by the radio frequency communication unit 306. The external display device may be a device instrument, a mobile phone, a tablet computer, etc. The circuit assembly 102 and one or more sensors 103 are housed within a prosthetic component or housing to measure the characteristics of the bursa in the vicinity of the prosthesis, as well as the lateral force of the prosthesis.

Further, the signal conversion unit 302 may be a current-voltage converter, a capacitor-voltage converter, or a resistor-voltage converter. The acquisition filter unit 303 may be a low-pass filter, a high-pass filter, a band-pass filter, or a band-stop filter. The analog-digital conversion unit 304 can be constructed by selecting successive approximation type, integration type, voltage-frequency conversion type, parallel comparison type, sigma-delta type, pipeline type, and the like according to analog accuracy, bandwidth, rate, and the like of the signal. The data processing unit 305 may use an MCU platform for processing, a DSP platform for processing, or a FPGA platform for processing. The radio frequency communication unit 306 may use near field communication, bluetooth communication, zigbee communication, and preferably may use various communication modes in the domain of body area network communication.

The measurement assembly 101 basically includes a sensor 103 coupled to a circuit assembly 102 via a pluggable interface lead 104. The sensor 103 may be a flexible sensor or a microelectromechanical system (MEMS) sensor. Depending on the measured parameters, the sensor 103 includes, but is not limited to, a pressure sensor, a strain sensor, an inertial measurement unit, a gyroscope, an accelerometer, a temperature sensor, a humidity sensor, a pH sensor. The sensor 103 is used to measure the physical indexes such as mechanical signals, movement angles, wear, temperature and humidity near the joint prosthesis, and convert these physical signals into voltage, resistance or current signals, which are collected by the power supply assembly 102.

In this embodiment, the sensor 103 is disposed in the joint replacement, so as to measure the pressure value and balance parameter of the joint replacement, and transmit the parameters to the circuit component 102 for corresponding signal processing, and then transmit the parameters to the external display device via the radio frequency communication unit 306 of the circuit component 102, so that the user can evaluate the pressure value and balance index of the joint replacement or the artificial prosthesis in the operation, and can assist in judging the state and normal working condition of the prosthesis, thereby solving the problem that the performance parameter of the joint replacement cannot be monitored in the operation in the prior art.

In some of these embodiments, the sensor 103 may be an optical detector, a chemical detector, or a physical detector. That is, the sensor 103 may be a physical type sensor of a strain gauge, or may be a sensor of a transduction type in which a chemical change occurs.

In some of these embodiments, the circuit protective housing 107 employs a biocompatible material, such as Polyetheretherketone (PEEK), polydimethylsiloxane (PDMS), polyethylene terephthalate (PET), and the like. The shape of the circuit protection shell 107 needs to be designed based on the geometric topology of the circuit, such as cuboid cavity, annular strip, tibial prosthesis extension shape, etc.

In this embodiment, the circuit assembly 102 is protected by providing the circuit protection housing 107, and the circuit protection housing 107 is made of biocompatible material, so that the circuit protection housing is safer and more reliable when being close to a human body.

In some of these embodiments, the circuit protection housing 107 is a rectangular cavity made of PEEK material, which is provided with an outlet for the pluggable interface wire 104.

In some of these embodiments, the system further includes a display unit, the display unit and the radio frequency communication unit 306.

In some of these embodiments, the circuit assembly 102 transmits the acquired data to an external display device by way of bluetooth communication.

Referring to fig. 3, in some embodiments, the sensor 103 is provided as a pressure sensor for acquiring data related to joint gap balance, preferably a flexible sensor, having a plurality of sensing units 201. The measurement assembly 101 is connected to the circuit assembly 102 by the long wire 202 and the pressure sensor transmits the acquired pressure data to the sensor control unit 301 of the circuit assembly 102 by the long wire 202.

In practice, the plurality of sensing units 201 may be symmetrically distributed based on the tibial prosthesis 106, and the plurality of sensing units 201 are disposed between the polyethylene insert 105 and the tibial prosthesis 106 at the surface of the tibial prosthesis 106.

The pressure sensor is led out of the circuit protection housing 107 and placed into the bone in the joint prosthesis. The circuit assembly 102 is placed in the circuit protection housing 107, and can realize control and signal transmission of data of the sensor. The circuit assembly 102 may be battery powered or wireless passive powered.

In this embodiment, by arranging a plurality of symmetrically distributed sensing units 201, an effective stress area can be included to the greatest extent, so that the pressure value and balance parameter of the joint replacement can be measured more accurately.

In some of these embodiments, the pressure sensor has a plurality of sensing units 201, such as 2, 4, 6, 8 or an array arrangement, the plurality of sensing units 201 being symmetrically arranged based on the medial and lateral sides of the tibial prosthesis 106, preferably, when 6 sensing units are provided, the plurality of sensing units are configured to be 3 based on the medial side of the tibial prosthesis 106 and 3 based on the lateral side of the tibial prosthesis 106. As shown in fig. 1, the tibial prosthesis 106 is a prosthesis having a cavity, and the sensing unit 201 may be disposed at an inner surface of the tibial prosthesis 106 when disposed on a medial side of the tibial prosthesis 106, and may be disposed at an outer surface of the tibial prosthesis 106 when disposed on a lateral side of the tibial prosthesis 106.

In some further embodiments, the 3 sensing elements 201 inside the tibial prosthesis 106 form an obtuse triangle, and the location coordinates and relative positions of the vertices of the obtuse triangle are determined by mechanical simulation and mechanical testing. Illustratively, the maximum angle α of the obtuse triangle is required to satisfy the condition 110 ° greater than α > 90 °, preferably 100 °, the next angle β satisfies the condition 45 ° greater than β > 65 °, preferably 55 °, and the minimum angle γ satisfies the condition 15 ° greater than γ > 35 °, preferably 25 °. The long side corresponding to the maximum angle alpha is the longitudinal symmetry axis direction of the measuring component 101, and optionally, the included angle between the long side corresponding to the maximum angle alpha and the symmetry axis is 0-10 degrees, and the obtuse triangle can furthest comprise an effective stress area. Based on the pressure data measured by the sensing unit 201 of the sensor, a medial pressure resultant force value and a lateral pressure resultant force value can be obtained through calculation, for example, the medial sensing unit 201 adds a certain weight to obtain a medial pressure resultant force value, and similarly, the medial sensing unit 201 of the tibial prosthesis 106 also adds a certain weight to obtain a lateral pressure resultant force value, and a weight coefficient is determined by simulation, for example, the weight coefficient can be 1. The obtained data are further calculated to obtain an inner side combined force acting point and an outer side combined force acting point. When calculating the resultant force value of the inner pressure and the resultant force value of the outer pressure, the initial coordinates of the sensitive units 201 on the inner side and the outer side can be taken as the basis respectively, and the resultant force coordinates of the corresponding sides can be obtained by adding a certain weight coefficient, wherein the weight coefficient can be the pressure value or the positive correlation function of the pressure value at the sensitive units 201. The system is suitable for monitoring pressure in a cavity or plane, which pressure can be used for evaluating the mechanical properties of the cavity or plane as a whole. Wherein the monitored pressure may be one pressure, or a plurality of pressure arrays.

In this embodiment, by arranging a plurality of symmetrically distributed sensing units 201 on the inner side and the outer side of the tibial prosthesis, the effective stress area can be included to the greatest extent by the arrangement of the obtuse triangles of the sensing units 201, so that the pressure value and the balance parameter of the joint replacement can be measured more accurately.

Referring to fig. 4, the acquisition filtering unit 303 includes: a transimpedance operational amplifier (TIA) 401, a first band-pass filter (BPF 1) 402, and an Analog Front End (AFE) 403, the analog front end 403 including an INTEGRATOR (intelgar) 404. The collection filtering unit 303 pre-processes the small voltage signal output by the signal conversion unit 302, and then inputs the small voltage signal to the analog-digital conversion unit 304, where the pre-process of the small voltage signal may include amplifying, filtering, integrating, and other processes.

Circuit configuration of digital signal processing as shown in fig. 5, the circuit of digital signal processing includes an analog-to-digital conversion unit 304 and a data processing unit 305. The analog-to-digital conversion unit 304 includes a Programmable Gain Amplifier (PGA) 51, an analog-to-digital converter (ADC) 52, a voltage dividing resistor R1 and a voltage dividing resistor R2, wherein an analog signal is input to the programmable gain amplifier 51 through analog-to-digital converter channels A0-A7, the input analog signal is amplified and then input to the analog-to-digital converter 52 to convert the analog signal into a digital signal, one end of the resistor R1 is connected to an output end of the programmable gain amplifier 51, the other end of the resistor R1 is connected to one of input ends of the programmable gain amplifier 51, one end of the resistor R2 is connected to the other end of the resistor R1, and the other end of the resistor R2 is grounded. The data processing unit 305 includes a second band-pass filter (BPF 2) 53 and digital signal memory channels MEM0-MEM3, and the digital signal output from the analog-to-digital conversion unit 304 is input to the second band-pass filter 53 for filtering, and the filtered digital signal is input to the digital signal memory channels for storage. The digital signal processing circuit can process and convert multiple analog signals, the range of the analog signals can be adjusted by the programmable gain amplifier 51 to increase the dynamic range of conversion, and then the digital signals can be converted by the analog-digital converter 52.

The circuit configuration of the radio frequency communication unit 306 is shown in fig. 6. The receiving end receives the wireless signal by the antenna 61, then filters by the filter 62, the filtered signal is split by the signal coupler 64, then is converted into a digital signal by the multi-channel analog-digital converter ADC, the digital signal is decoded by the algorithm of the DSP by the digital signal processing Modem (DSP Modem) to obtain decoded data, the decoded data is stored in the SRAM or ROM, and the data is exchanged with the data processing unit 305 by the Radio controller (Radio controller); the transmitting end sends the data to the Digital signal processing modem by the data processing unit 305 for coding, modulates the coded signal to a specified frequency band by a DAC or a Digital mixer or a Digital phase-locked loop (Digital PLL), and finally amplifies the signal by the power amplifier 63 and then transmits the signal by the antenna 61.

The circuit assembly 102 further comprises a reference source unit 307, as shown in fig. 2, the reference source unit 307 being connected to the signal conversion unit 302 for providing a reference voltage to the signal conversion unit 302. The reference source unit 307 may be a shunt reference voltage source, a series reference voltage source, or a bandgap reference voltage source. As shown in fig. 7, the shunt reference voltage source is formed by connecting one end of a zener diode to the ground, and the other end of the zener diode is connected to one end of a resistor to output voltage, VIN is a voltage input, vref is a voltage output, and the voltage is input to the other end of the resistor. As shown in fig. 8, the series reference voltage source is a three-terminal device, which includes a voltage input VIN, a voltage output VOUT, and a ground GND, with a voltage-controlled resistor equivalent model in between. As shown in fig. 9, the bandgap reference voltage source is formed by cascading a bandgap amplifier 901 and an error amplifier 902, where VIN is a voltage input and Vout is a voltage output. The shunt reference voltage source is simple in design, can have good stability under wide current and load adjustment, and is suitable for the design of a negative reference. The series reference voltage source is a three terminal device, lowest static noise and static current. The bandgap reference voltage source can be based on the characteristics of a bipolar junction transistor, which combines a known temperature drift with the resistivity in the circuit, and can compensate for the temperature drift to provide a very accurate reference voltage. Different design modes are preferred for the excitation of the electrodes and for the requirements of the power supply reference.

In some of these embodiments, the system for monitoring joint replacement performance further comprises an artificial bone component mounted on the artificial joint that protects the human body from replacement of the damaged capsule.

In some embodiments, the system for monitoring joint replacement performance is designed with a fully flexible integrated circuit, and comprises a flexible sensor circuit, a flexible analog-to-digital conversion circuit and a flexible radio frequency communication circuit, which form a flexible wearable system.

Referring to fig. 10, the present utility model provides another system for monitoring the performance of a joint replacement, as shown in fig. 10, comprising a first circuit assembly 504 and a first measurement assembly 503, the first measurement assembly 503 being disposed within the joint replacement, the first circuit assembly 504 being coupled to the first measurement assembly 503. The first measurement component 503 comprises a sensor. The sensor of the first measurement assembly 503 is located between the first polyethylene insert 502 and the first tibial prosthesis 505, the first tibial prosthesis 505 being adapted to the tibia 506. The system further includes a circuit protection component within which the first circuit component 504 is disposed, the circuit protection component being made of a biocompatible material. As shown in fig. 10, the circuit protection component may be a packaging component 501, and the first circuit component 504 is disposed on a side of the first tibial prosthesis 505 and packaged by the packaging component 501.

In this embodiment, the sensor is disposed in the joint replacement, so as to measure the pressure value and balance parameter of the joint replacement, and the parameter is transmitted to the circuit component for corresponding signal processing, and then transmitted to the external display device via the radio frequency communication unit of the circuit component, so that the user can evaluate the pressure value and balance index of the joint replacement or the artificial prosthesis during operation, and can assist in judging the state and normal working condition of the prosthesis, thereby solving the problem that the performance parameter of the joint replacement cannot be monitored during operation in the prior art.

In some of these embodiments, package 501 is an annular strip of Polydimethylsiloxane (PDMS) that is fabricated by a liquid cast molding process. The polydimethylsiloxane annular band may be one-component or two-component, with or without the addition of a catalyst, and has a curing temperature of 40-140 ℃, preferably 80-110 ℃, and most preferably 100-110 ℃.

In some of these embodiments, the measurement assembly 101 is disposed between the polyethylene spacer 105 and the tibial prosthesis 106, and the circuit assembly is disposed outside the body, the two being connected by a long wire; alternatively, the measurement assembly 101 is disposed between the polyethylene insert 105 and the tibial prosthesis 106, and the circuit assembly is disposed on the side of the tibial prosthesis 106 and/or the polyethylene insert 105; alternatively, the measurement assembly 101 is disposed on the upper surface of the polyethylene insert 105 and the circuit assembly is disposed on the side of the tibial prosthesis 106 and/or the polyethylene insert 105; alternatively, both the measurement assembly 101 and the circuit assembly are disposed on the side of the tibial prosthesis 106 and/or the polyethylene insert 105; still alternatively, both the measurement assembly 101 and the circuit assembly are disposed in extensions that are both disposed in the tibial prosthesis 106.

The technical features of the above-described embodiments may be combined in any manner, and for brevity, all of the possible combinations of the technical features of the above-described embodiments are not described, however, all of the combinations of the technical features should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

It will be appreciated by persons skilled in the art that the above embodiments have been provided for the purpose of illustrating the utility model and are not to be construed as limiting the utility model, and that suitable modifications and variations of the above embodiments are within the scope of the utility model as claimed.

Claims (10)

1. A system for monitoring the performance of a joint replacement, the system comprising a measurement assembly and a circuit assembly, the measurement assembly being connected to the circuit assembly;

the measurement assembly includes a sensor;

the circuit component comprises a sensor control unit, a signal conversion unit, an acquisition filtering unit, an analog-digital conversion unit, a data processing unit and a radio frequency communication unit;

the sensor control unit is connected with the sensor, the input end of the signal conversion unit is connected with the sensor control unit, the output end of the signal conversion unit is connected with the input end of the acquisition filter unit, the output end of the acquisition filter unit is connected with the input end of the analog-digital conversion unit, the output end of the analog-digital conversion unit is connected with the data processing unit, and the input end of the radio frequency communication unit is connected with the data processing unit.

2. The system for monitoring the performance of a joint replacement according to claim 1, wherein the measurement assembly comprises a pressure sensor comprising a plurality of sensing units symmetrically disposed on medial and lateral sides of a tibial prosthesis of the joint replacement.

3. The system for monitoring joint replacement performance of claim 1 or 2, wherein the circuit assembly further comprises a reference source unit, the reference source unit being connected to the signal conversion unit.

4. The system for monitoring joint replacement performance according to claim 1 or 2, wherein the signal conversion unit is a current-to-voltage converter, a capacitance-to-voltage converter, or a resistance-to-voltage converter.

5. The system for monitoring the performance of a joint replacement of claim 1, wherein the measurement assembly is disposed between a polyethylene spacer of the joint replacement and a tibial prosthesis of the joint replacement;

alternatively, the measurement assembly is disposed on an upper surface of a polyethylene spacer of the joint replacement;

alternatively, the measurement assembly is disposed on a side of a tibial prosthesis of the joint replacement;

alternatively, the measurement assembly is disposed on a side of a polyethylene spacer of the joint replacement;

alternatively, the measurement assembly is disposed in an extension of a tibial prosthesis of the joint replacement.

6. The system for monitoring the performance of a joint replacement of claim 1, 2 or 5, wherein the circuit assembly is disposed on a side of a polyethylene spacer of the joint replacement;

and/or the circuit assembly is disposed on a side of a tibial prosthesis of the joint replacement;

and/or, the circuit assembly is disposed in an extension of a tibial prosthesis of the joint replacement;

and/or the circuit assembly is arranged outside the human body.

7. The system for monitoring the performance of a joint replacement of claim 1, further comprising a circuit protection component disposed within the circuit protection component, the circuit protection component being made of a biocompatible material.

8. The system for monitoring joint replacement performance of claim 7, wherein the circuit protection assembly is a cuboid cavity housing, the circuit assembly is disposed within the cuboid cavity housing, the measurement assembly is disposed outside the cuboid cavity housing, and the circuit assembly is connected to the measurement assembly by pluggable interface leads.

9. The system for monitoring joint replacement performance of claim 7 wherein the circuit protection component is an annular strip within which the circuit component and the measurement component are packaged.

10. The system for monitoring the performance of a joint replacement according to any one of claims 1, 2, 5, 7 to 9, further comprising a display unit, the display unit being in radio connection with the radio frequency communication unit.

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