CN113925493A - Knee joint multi-parameter measuring system based on artificial total knee joint replacement - Google Patents
Knee joint multi-parameter measuring system based on artificial total knee joint replacement Download PDFInfo
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- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
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Abstract
The invention discloses a knee joint multi-parameter measuring system based on artificial total knee joint replacement; the method comprises the following steps: the matrix type pressure sensor array is used for being placed on a lower limb osteotomy plane of a knee joint of a patient to acquire a pressure signal in the doctor operation process; the posture measuring device is used for placing the device on a lower limb osteotomy plane of the knee joint of a patient to acquire a posture signal of the lower limb in the operation process of a doctor; the contact track measuring device is used for placing the contact track measuring device on a lower limb osteotomy plane of the knee joint of a patient in the operation process of a doctor to obtain relevant motion track data; the data measured by the matrix type pressure sensor array, the posture measuring device and the contact track measuring device are sent to the data processing device, the tibial gasket is temporarily replaced in the operation process, and the tibial gasket is taken out and put into a proper tibial gasket after the pressure and the posture are balanced. The invention solves the problem that the gap balance is difficult to be accurately mastered in the existing artificial total knee joint replacement process.
Description
Technical Field
The invention relates to the technical field of knee joint replacement, in particular to a knee joint multi-parameter measuring system based on artificial total knee joint replacement.
Background
The artificial knee joint replacement is a new technology for treating knee joint diseases, which is gradually developed after the modern artificial hip joint is successfully applied to patients, can effectively eradicate late-stage knee joint pain, and greatly improves the life quality of the patients.
One of the key links in the success of Total Knee Arthroplasty (TKA) is to obtain good joint gap balance, and in recent years, the study of adopting a gap pressure measurement technology to explore the gap balance in total knee arthroplasty has become one of the research hotspots for improving the total knee arthroplasty technology. The development of different types of measurement methods and measurement devices is endless. The research progress and the development status of the tibia gasket type joint gap pressure measurement sensor in the total knee joint replacement operation are difficult to meet the actual operation requirements, and the situations that the installation position is inaccurate and the tibia gasket type joint gap pressure measurement sensor is not matched with a patient easily occur.
Disclosure of Invention
Therefore, the invention provides a knee joint multi-parameter measuring system based on artificial total knee joint replacement, which aims to solve the problem that the gap balance is difficult to accurately grasp in the existing artificial total knee joint replacement process.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention discloses a knee joint multi-parameter measuring system based on artificial total knee joint replacement, which is characterized by comprising: the device comprises a matrix type pressure sensor array, an attitude measuring device, a contact track measuring device and a data processing device;
the matrix type pressure sensor array is used for being placed on a lower limb osteotomy plane of a knee joint of a patient in the operation process of a doctor, acquiring pressure signals and sending measured data to the data processing device;
the posture measuring device is used for placing the device on a lower limb osteotomy plane of the knee joint of a patient in the operation process of a doctor, acquiring posture signals of the lower limb, including a lower limb overturning angle and a deflection angle, and sending measured data to the data processing device;
the contact track measuring device is used for placing the contact track measuring device on a lower limb osteotomy plane of a knee joint of a patient in the operation process of a doctor, acquiring the motion track data of a contact point of an upper femoral prosthesis and a lower limb tibial platform, and sending the measured data to the data processing device;
the matrix type pressure sensor array, the posture measuring device and the contact track measuring device are the same device and are used for temporarily replacing the tibial gasket in the operation process, taking out the tibial gasket after pressure and posture are balanced, and putting the tibial gasket into a proper position.
Further, the shape and the size of the matrix pressure sensor array, the posture measuring device and the contact track measuring device are the same as those of the tibial gasket.
Furthermore, the data processing device receives, stores and displays data, the data processing device carries out filtering and algorithm compensation processing after receiving pressure data sent by the matrix type pressure sensor array, the data processing device carries out mechanical energy space coordinate transformation processing after receiving attitude data sent by the attitude measuring device, and the data processing device carries out integral transformation processing after receiving measuring data sent by the contact track measuring device.
Further, the data processing device carries out digital and graphical display on the pressure data; performing spatial three-dimensional real-time display on the attitude measurement data; and recording and displaying the contact track measurement data in real time.
Further, matrix pressure sensor array is the pressure sensor array, and the pressure sensor array is used for measuring the pressure data between tibial plateau and the last thighbone, attitude measurement device is attitude sensor, attitude sensor is used for measuring the real-time rotation angle of low limbs and deflection angle data.
Further, the effective measurement plane formed by the pressure sensor array comprises an effective contact surface of the upper limb prosthesis and the tibial plateau.
Further, all install first microprocessor in matrix pressure sensor array, gesture measuring device, the contact orbit measuring device, first microprocessor adopts the mode of low-power consumption collection to handle the various data that acquire.
Further, data transmission that matrix pressure sensor array, attitude measurement device, contact orbit measuring device gathered to first transceiver, carry out the packing processing to data through first transceiver, send data to data processing module after the packing is accomplished.
Further, the data processing device comprises a second transceiver, a second microprocessor, a display and a memory, wherein the second transceiver is used for receiving data signals from the matrix pressure sensor array, the attitude measuring device and the contact trajectory measuring device and processing the received data to acquire information of pressure, attitude and trajectory; the second microprocessor processes the pressure data by adopting a data fitting algorithm, processes the attitude data by adopting a smooth filtering algorithm, a dynamic compensation algorithm and a left side transformation algorithm, and processes the contact trajectory data by adopting an integral transformation algorithm and an angle compensation algorithm; the display displays the processed information in a dynamic graphical and digital form; and the memory stores the processed data.
Furthermore, the matrix pressure sensor array and the attitude measuring device are characterized in that the contact track measuring device comprises an upper stress curved surface, a bottom supporting plane, a sensor, a circuit board and a closed shell; the upper stress curved surface, the bottom supporting surface, the sensor and the circuit board are positioned in the closed shell; the sensor comprises a pressure sensor which is positioned on the circuit board, is a sensor array and is positioned at a cavity position on the circuit board, and external pressure is conveniently transmitted to the pressure sensor array through the upper stress curved surface by combining the upper stress curved surface, the bottom supporting plane, the cavity, the pressure sensor array and the circuit board; the attitude sensor is located on the circuit board.
The invention has the following advantages:
the invention discloses a knee joint multi-parameter measurement system based on artificial total knee joint replacement, which adopts a matrix type sensor array pressure measurement technology, can carry out static and dynamic measurement on the pressure distribution of a contact surface, displays the outline and the numerical value of the pressure distribution in real time by a visual and vivid two-dimensional and three-dimensional color image, can store and analyze the whole measurement process, can realize measurement of the bone joint gap pressure, and provides a theoretical basis for the development of an intelligent prosthesis with a pressure measurement function.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic communication connection diagram of a knee joint multi-parameter measurement system based on an artificial total knee arthroplasty according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a piezoelectric film of a matrix pressure sensor array according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a charge signal processing circuit generated after a piezoelectric film is pressed according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a matrix pressure sensor array according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a matching process between a bluetooth chip and a PC terminal according to an embodiment of the present invention;
in the figure: the device comprises a 1-matrix type pressure sensor array, a 2-attitude measuring device, a 3-contact track measuring device and a 4-data processing device.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present embodiment discloses a knee joint multi-parameter measurement system based on artificial total knee arthroplasty, which includes: the device comprises a matrix type pressure sensor array 1, an attitude measuring device 2, a contact track measuring device 3 and a data processing device 4.
The matrix type pressure sensor array 1 is used for being placed on a lower limb osteotomy plane of a knee joint of a patient in the operation process of a doctor, acquiring a pressure signal and sending measured data to the data processing device 4;
the posture measuring device 2 is used for placing the patient knee joint lower limb osteotomy plane on the doctor operation process, acquiring posture signals of the lower limb, including a lower limb overturning angle and a deflection angle, and sending measured data to the data processing device 4;
the contact track measuring device 3 is used for placing the device on a lower limb osteotomy plane of a knee joint of a patient in the operation process of a doctor, acquiring the motion track data of a contact point of an upper femoral prosthesis and a lower limb tibial platform, and sending the measured data to the data processing device 4;
the matrix type pressure sensor array 1, the posture measuring device 2 and the contact track measuring device 3 are the same device and are used for temporarily replacing the tibial gasket in the operation process, taking out the tibial gasket after pressure and posture are balanced and putting the tibial gasket into a proper position.
The shapes and the sizes of the matrix type pressure sensor array 1, the posture measuring device 2 and the contact track measuring device 3 are the same as those of the tibial gasket.
The matrix type pressure sensor array 1 can adopt various sensor forms, including piezoelectric film pressure sensors, silicon piezoresistive pressure sensors and the like, the sensors are light, thin and flexible, and are suitable for the requirements of an artificial total knee joint multi-parameter measuring system, the flexible sensor sensing core is manufactured according to the test requirements, and a subsequent adjusting circuit matched with the flexible sensor sensing core is designed, so that the key for the artificial knee joint multi-parameter measuring system is developed.
The piezoelectric film of the designed matrix type pressure sensor array 1 belongs to a high-molecular piezoelectric material, the surface of the film is plated with an electrode, and the material can be regarded as a transduction capacitor. When the surface of the film is loaded with external force, the upper surface and the lower surface of the film can generate charges with opposite polarities and equal sizes. According to the principle of piezoelectric effect of piezoelectric material, the output charge of the sensing point is proportional to the applied stress and the sensing area of the film, that is:
Q＝dFA (1)
wherein: q is the output charge quantity of the sensor under the action of stress, d is the dielectric constant of the PVDF piezoelectric film, F is the stress applied perpendicular to the surface of the film, and A is the effective sensing area of the film.
The change of the force acting on the sensing surface of the film can be represented by the magnitude of the output charge Q of the sensor. The PVDF piezoelectric film has good piezoelectric property and mechanical property, and can meet the test requirements. In addition, the film is light, thin and flexible and can be bent at will, so that the dynamic pressure change of the human body can be measured.
According to the requirement of distribution of the knee joint pressure characteristic points, the effective sensing area A of a single sensing point is selected to be 36mm 2. The shape is shown in fig. 2, two sections of pins are reserved outside the maximum sensing area, which aims to facilitate the connection of the electrode and avoid the influence of the electrode connection on the signal output of the sensing surface. Because the film thickness is thin and the property can be changed at the temperature of more than 80 ℃, the electrode can not be led out by adopting a metal welding method. Therefore, the invention adopts the method of bonding the copper electrode on the pins on the upper surface and the lower surface by the conductive adhesive to lead out the electrode. Considering that the piezoelectric film belongs to a sensing material with high internal resistance and weak signals, the exposed part of the copper electrode is coated with an insulating layer, a shielding cable with good noise resistance is selected as a charge output lead, and finally the shielding cable is connected with a subsequent circuit through a plug element.
In this embodiment, the attitude measurement device 2 is an attitude sensor for measuring data of the real-time turning angle and the deflection angle of the lower limb. A microprocessor acceleration sensor module is used. The microprocessor integrated six-axis motion processing assembly is internally provided with a three-axis acceleration sensor and a three-axis gyroscope and can be connected with an external magnetic sensor through a second IIC interface of the microprocessor integrated six-axis motion processing assembly. And carrying out data calculation on the nine-axis data, and further outputting complete nine-axis attitude fusion calculation data. And the load of the single chip microcomputer is reduced by utilizing the DMP to carry out data calculation. Through control instructions and communication with the singlechip I2C, the control instructions can be transmitted to the singlechip and then compiled. The display module here is an LCD1602, and the compiled data is transmitted to an I/O port connected to the LCD1602, and the data can be displayed by reading and writing commands. When the data recorded by the ADXL345 triaxial accelerometer is changed, the data displayed in the CD1602 is updated, so that the design of the acquisition and display circuit based on the single chip microcomputer is achieved.
Data processing device 4 carries out the receipt, storage and the demonstration of data, data processing device 4 carries out filtering, algorithm compensation processing after receiving the pressure data that matrix pressure sensor array 1 sent, data processing device 4 carries out the transform processing of mechanical energy space coordinate after receiving the gesture data that gesture measuring device 2 sent, data processing device 4 carries out the integral transform processing after receiving the measured data that contact trajectory measuring device 3 sent. The data processing device 4 carries out digital and graphical display on the pressure data; performing spatial three-dimensional real-time display on the attitude measurement data; and recording and displaying the contact track measurement data in real time.
The piezoelectric film generates charge signals after being pressed, the signals are very weak and are inconvenient to measure and collect, and the charge signals can be collected only by converting the charge quantity into voltage signals through a subsequent amplifying circuit. And because the knee joint multi-parameter measurement system of the artificial total knee joint replacement is small in size, the designed amplifying circuit is a single-chip charge amplifying circuit, the circuit needs few elements and is small in size and mass, and the amplifying effect can be adjusted according to the requirement. The main components comprise an integrating amplifier LM741, a feedback capacitor C and a feedback resistor R. Meanwhile, in order to avoid the influence of high-frequency noise signals in the test on the test result, a low-pass filter circuit is added behind the amplifying circuit. The circuit is shown in fig. 3.
The circuit output voltage is proportional to the input charge quantity, namely:
wherein: u is the output voltage, Q is the sensor input charge, and C is the feedback capacitance.
The formula (1) is brought into the formula (2) to obtain:
as can be seen from the equation (3), the output U of the charge amplifier is proportional to the stress F applied to the sensor, proportional to the stressed effective area A, and inversely proportional to the feedback capacitance C. The change in force can therefore be described by a change in output voltage. The piezoelectric film sensor is connected to the charge input end, and the voltage output end is connected to the data acquisition equipment, so that the frequency response test can be carried out.
In the integrating amplifier circuit, the feedback resistor R and the feedback capacitor C are key elements determining the circuit effect. The feedback capacitor C determines the overall amplification effect of the circuit, and the feedback resistor R generally needs to be a large resistor of 106 orders of magnitude, which is used for improving the input impedance of the circuit and ensuring that the circuit has better stability. R and C in the circuit together determine the lower cut-off frequency achievable by the circuit.
fcThe signal represents the lowest frequency response signal which can be collected by the circuit after the sensor is connected with the amplifying circuit. The lower cut-off frequency should be as low as possible, and if the low frequency response is not enough, the original signal pulse cannot be accurately reproduced. In this subject, f is required to be satisfied in response to the use requirement of the pressure sensorcLess than or equal to 0.25 Hz. Therefore, the selection of the feedback capacitor and the feedback resistor should integrate the requirements of both the amplification effect and the test frequency.
When the charge signal generated by the piezoelectric film sensor is amplified in a high gain mode by the charge amplifying circuit, the original charge signal is converted into a voltage signal which has better anti-noise capability and is convenient to transmit, collect and process subsequently. At this time, the voltage signal intensity is stable. The low-pass filtering part added after the amplifying circuit is used for facilitating the analysis of the signal in the later period, and high-frequency noise signals in the surrounding environment are filtered. As shown in the low pass filter circuit portion of the figure:
in the formula: omega is the low pass filter cut-off frequency, R1And C1Respectively a filter resistor and a filter capacitor. Signals with frequencies higher than ω will be filtered out by the low pass filter circuit.
Referring to fig. 4, matrix pressure sensor array 1 is the pressure sensor array, and the pressure sensor array is used for measuring the pressure data between tibial plateau and the last thighbone, attitude measurement device 2 is attitude sensor, attitude sensor is used for measuring the real-time rotation angle of low limbs and deflection angle data. The effective measuring surface formed by the pressure sensor array comprises an effective contact surface of the upper limb prosthesis and the tibial plateau.
All install first microprocessor in matrix pressure sensor array 1, gesture measuring device 2, the contact orbit measuring device 3, first microprocessor adopts the mode processing that the low-power consumption was gathered various data that acquire. Data transmission that matrix pressure sensor array 1, attitude measurement device 2, contact orbit measuring device 3 gathered to first transceiver, packs data through first transceiver, packs and accomplishes and sends data to data processing module. In the present embodiment, the data is transmitted by way of wireless bluetooth transmission.
The specific Bluetooth transmission mode is as follows:
the specific implementation is realized by a Bluetooth chip in the artificial total knee joint multi-parameter measurement system, and the nRF51822 is suitable for low-power-consumption Bluetooth and 2.4GHz ultra-low-power-consumption wireless application. The embedded 2.4GHz transceiver supports Bluetooth low energy and 2.4GHz operation, wherein the 2.4GHz mode Nordic nRF24L series products are wireless compatible.
Bluetooth is configured in an automatic connection mode, and can be directly used as a serial port after being connected with other devices.
Select for use bluetooth module to make the transmission of data more convenient, avoid loaded down with trivial details cable wiring, can not receive the restriction of serial ports line distance.
Referring to fig. 5, the bluetooth and PC matching process is:
judging whether the equipment supports the Bluetooth or not, if not, exiting, if so, judging whether the Bluetooth is opened or not, if not, circulating until opening operation is executed; and judging whether the equipment is scanned or not, quitting if the equipment is not scanned, selecting the Bluetooth module if the equipment is scanned, establishing connection, judging whether the connection is successful or not, quitting if the connection is unsuccessful, sending data if the connection is successful, and displaying a result.
The data processing device 4 comprises a second transceiver, a second microprocessor, a display and a memory, and the second transceiver is used for receiving data signals from the matrix pressure sensor array 1, the attitude measuring device 2 and the contact trajectory measuring device 3 and processing the received data to acquire pressure, attitude and trajectory information; the second microprocessor processes the pressure data by adopting a data fitting algorithm, processes the attitude data by adopting a smooth filtering algorithm, a dynamic compensation algorithm and a left side transformation algorithm, and processes the contact trajectory data by adopting an integral transformation algorithm and an angle compensation algorithm; the display displays the processed information in a dynamic graphical and digital form; and the memory stores the processed data.
The matrix pressure sensor array 1, the attitude measuring device 2 and the contact track measuring device 3 comprise upper stress curved surfaces, bottom supporting planes, sensors, a circuit board and a closed shell; the upper stress curved surface, the bottom supporting surface, the sensor and the circuit board are positioned in the closed shell; the sensor comprises a pressure sensor which is positioned on the circuit board, is a sensor array and is positioned at a cavity position on the circuit board, and external pressure is conveniently transmitted to the pressure sensor array through the upper stress curved surface by combining the upper stress curved surface, the bottom supporting plane, the cavity, the pressure sensor array and the circuit board; the attitude sensor is located on the circuit board.
The knee joint multi-parameter measurement system based on the artificial total knee joint replacement disclosed by the embodiment adopts a matrix type sensor array pressure measurement technology, can carry out static and dynamic measurement on the pressure distribution of a contact surface, displays the outline and the numerical value of the pressure distribution in real time by a visual and vivid two-dimensional and three-dimensional color image, can store and analyze the whole measurement process, can realize measurement of the bone joint gap pressure, and provides a theoretical basis for development of an intelligent prosthesis with a pressure measurement function.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A knee joint multi-parameter measurement system based on artificial total knee arthroplasty, the system comprising: the device comprises a matrix type pressure sensor array, an attitude measuring device, a contact track measuring device and a data processing device;
the matrix type pressure sensor array is used for being placed on a lower limb osteotomy plane of a knee joint of a patient in the operation process of a doctor, acquiring pressure signals and sending measured data to the data processing device;
the posture measuring device is used for placing the device on a lower limb osteotomy plane of the knee joint of a patient in the operation process of a doctor, acquiring posture signals of the lower limb, including a lower limb overturning angle and a deflection angle, and sending measured data to the data processing device;
the contact track measuring device is used for placing the contact track measuring device on a lower limb osteotomy plane of a knee joint of a patient in the operation process of a doctor, acquiring the motion track data of a contact point of an upper femoral prosthesis and a lower limb tibial platform, and sending the measured data to the data processing device;
the matrix type pressure sensor array, the posture measuring device and the contact track measuring device are the same device and are used for temporarily replacing the tibial gasket in the operation process, taking out the tibial gasket after pressure and posture are balanced, and putting the tibial gasket into a proper position.
2. The knee joint multi-parameter measurement system based on artificial total knee replacement of claim 1, wherein the matrix pressure sensor array, the posture measurement device and the contact track measurement device have the same shape and size as the tibial insert.
3. The knee joint multi-parameter measurement system based on artificial total knee joint replacement according to claim 1, wherein the data processing device receives, stores and displays data, the data processing device performs filtering and algorithm compensation processing after receiving pressure data sent by the matrix pressure sensor array, the data processing device performs mechanical energy space coordinate transformation processing after receiving attitude data sent by the attitude measurement device, and the data processing device performs integral transformation processing after receiving measurement data sent by the contact trajectory measurement device.
4. The knee joint multi-parameter measurement system based on the artificial total knee joint replacement surgery as claimed in claim 3, wherein the data processing device is used for displaying the pressure data in a digital and graphical way; performing spatial three-dimensional real-time display on the attitude measurement data; and recording and displaying the contact track measurement data in real time.
5. The knee joint multi-parameter measurement system based on artificial total knee arthroplasty according to claim 1, wherein the matrix-type pressure sensor array is a pressure sensor array for measuring pressure data between a tibial plateau and an upper femur, and the posture measurement device is a posture sensor for measuring real-time flip angle and deflection angle data of the lower limb.
6. The knee joint multiparameter measuring system based on artificial total knee replacement of claim 5, wherein the effective measuring plane formed by the pressure sensor array comprises an effective contact plane of an upper limb prosthesis and a tibial plateau.
7. The knee joint multi-parameter measurement system based on artificial total knee joint replacement of claim 1, wherein the matrix pressure sensor array, the posture measurement device and the contact trajectory measurement device are all provided with a first microprocessor, and the first microprocessor processes the acquired various data in a low power consumption acquisition manner.
8. The knee joint multi-parameter measurement system based on artificial total knee joint replacement of claim 1, wherein the data collected by the matrix pressure sensor array, the posture measurement device and the contact trajectory measurement device is sent to a first transceiver, the first transceiver performs packing processing on the data, and the data is sent to the data processing module after the packing is completed.
9. The knee joint multi-parameter measurement system based on artificial total knee joint replacement of claim 1, wherein the data processing device comprises a second transceiver, a second microprocessor, a display and a memory, the second transceiver is used for receiving data signals from the matrix pressure sensor array, the posture measurement device and the contact trajectory measurement device and processing the received data to obtain information of pressure, posture and trajectory; the second microprocessor processes the pressure data by adopting a data fitting algorithm, processes the attitude data by adopting a smooth filtering algorithm, a dynamic compensation algorithm and a left side transformation algorithm, and processes the contact trajectory data by adopting an integral transformation algorithm and an angle compensation algorithm; the display displays the processed information in a dynamic graphical and digital form; and the memory stores the processed data.
10. The knee joint multi-parameter measurement system based on artificial total knee joint replacement of claim 1, wherein the matrix pressure sensor array, the posture measurement device and the contact trajectory measurement device comprise an upper stress curved surface, a bottom support plane, a sensor, a circuit board and a closed shell; the upper stress curved surface, the bottom supporting surface, the sensor and the circuit board are positioned in the closed shell; the sensor comprises a pressure sensor which is positioned on the circuit board, is a sensor array and is positioned at a cavity position on the circuit board, and external pressure is conveniently transmitted to the pressure sensor array through the upper stress curved surface by combining the upper stress curved surface, the bottom supporting plane, the cavity, the pressure sensor array and the circuit board; the attitude sensor is located on the circuit board.
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| US20130226036A1 (en) * | 2012-02-27 | 2013-08-29 | Orthosensor Inc. | Measurement device for the muscular-skeletal system having an integrated sensor |
| CN107242920A (en) * | 2017-07-26 | 2017-10-13 | 北京易迈医疗科技有限公司 | Knee joint single condyle attitude measuring and system |
| CN113423324A (en) * | 2018-10-05 | 2021-09-21 | 奥索传感器公司 | Measurement system configured to support installation of a ball and socket joint and method thereof |
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| CN109758274A (en) * | 2019-02-28 | 2019-05-17 | 清华大学 | Measurement method and system of the distal femur relative to prosthese gasket line of force track in single condyle knee replacements |
| CN112656552A (en) * | 2020-12-14 | 2021-04-16 | 清华大学 | Wireless portable force line track measuring system in single condyle knee joint replacement |
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