Calibration device for knee joint array pressure sensor

Abstract

The present application provides a calibration device for a knee joint array pressure sensor, which belongs to the field of sensor calibration technology. The device includes: a bottom plate, with an air inlet groove recessed, and an air inlet is penetrated through the groove wall of the air inlet groove; a gas diverter plate, which covers the side of the air inlet groove facing the upper surface of the bottom plate, and is penetrated with a diverter hole, and the diverter hole and the air inlet groove are connected; an airbag assembly is correspondingly penetrated and fixed to the diverter hole; a sensor bushing, which is sealed and connected to the side of the gas diverter plate away from the bottom plate, and is provided with a chamber for accommodating the knee joint pressure sensor; a pressing assembly, which is fixedly connected to the bottom plate and is provided with a pressing part to abut against the upper surface of the sensor bushing; wherein, when the air inlet is introduced with pressurized gas, the airbag assembly expands by inputting pressurized gas through the diverter hole to fit the outer curved surface of the knee joint pressure sensor and apply calibration pressure to the outer curved surface. The present application can adapt to the precise calibration of knee joint array pressure sensors of different shapes and sizes.

Description

Technical Field

[0001] The present application relates to the technical field of sensor calibration, and in particular to a calibration device for a knee joint array pressure sensor. Background Art

[0002] At present, knee joint array pressure sensors are used in medical devices for knee joint pressure measurement. Such sensors are usually made of flexible film arrays made of ion membranes or resistance membranes, which have high sensitivity and good flexibility. However, before use, all sensitive points of the knee joint array pressure sensor need to be calibrated and calibrated to ensure its accuracy and consistency.

[0003] Since the knee joint array pressure sensor is a double-concave special-shaped packaging shell, the traditional pressure calibration method is usually a single-point test with a pin. However, the single-point test with a pin has many test points, a large amount of work, and inconsistent test repeatability between points, resulting in low calibration efficiency and difficulty in ensuring accuracy. Therefore, an improved calibration scheme is to customize a pressure calibration device with a size that matches the knee joint array pressure sensor. However, in actual applications, in order to match the knee joints of different people, the knee joint pressure sensor needs to be customized with shells of different shapes. Although the customized pressure calibration device with matching sizes can perform array calibration, it cannot adapt to all types of knee joint array pressure sensors and cannot be completely matched with the packaging shell of the knee joint array pressure sensor, resulting in the inability to accurately apply the same pressure for calibration. Summary of the invention

[0004] The purpose of the present application is to provide a calibration device for a knee joint array pressure sensor to solve the above-mentioned problem.

[0005] To achieve the above objectives, the present application provides a calibration device for a knee joint array pressure sensor, the device comprising:

[0006] A bottom plate, wherein an air inlet groove is concavely formed on the upper surface of the bottom plate, and an air inlet port communicating with the outside is penetrated through the groove wall of the air inlet groove;

[0007] A gas diverter plate, the gas diverter plate is connected to the side of the upper surface of the gas inlet groove facing the bottom plate, the gas diverter plate is penetrated by diverter holes arranged at intervals, and the diverter holes are respectively connected to the gas inlet groove;

[0008] An airbag assembly, the airbag assembly is correspondingly penetrated and fixed to the diverter hole, and has a portion exposed on a side of the gas diverter plate away from the bottom plate;

[0009] A sensor bushing, the sensor bushing is sealingly connected to a side of the gas diverter plate away from the bottom plate, and the sensor bushing is provided with a chamber matching the shape of the shell of the knee joint array pressure sensor for accommodating the knee joint array pressure sensor;

[0010] A pressing assembly, the pressing assembly is fixedly connected to the bottom plate and is provided with an axially displaceable pressing portion, the pressing portion being used to abut against the upper surface of the sensor bushing;

[0011] When pressurized gas is introduced into the air inlet, the airbag assembly inputs the pressurized gas respectively through the diversion holes, so that the part exposed on the side of the gas diversion plate away from the bottom plate expands to fit the outer curved surface of the knee joint array pressure sensor and apply a calibrated pressure to the outer curved surface.

[0012] In some embodiments, the gas diverter plate is penetrated by two left and right diverter holes arranged at intervals, and the airbag assembly includes two airbags correspondingly penetrated and fixed to the two diverter holes, and the two airbags both have a portion exposed on a side of the gas diverter plate away from the bottom plate;

[0013] Among them, when the air inlet is introduced into the pressurized gas, the two air bags respectively input the pressurized gas through the two diversion holes, so that the part exposed on the side of the gas diversion plate away from the bottom plate expands, so as to respectively fit the left and right outer curved surfaces of the knee joint array pressure sensor and apply a calibrated pressure to the left and right outer curved surfaces.

[0014] In some embodiments, the device further comprises:

[0015] An airbag fixing member is fixedly connected to the opening edges of the two diversion holes facing the bottom plate, and is used for respectively fastening the two airbags.

[0016] In some embodiments, the device further comprises:

[0017] A sealing member is sleeved on the outer peripheral side of the sensor bushing and is used to form a sealed connection between the sensor bushing and the periphery of the gas diverter plate.

[0018] In some embodiments, a mounting hole is formed through the sealing member, a connecting hole is formed on a side of the gas diverter plate facing the sensor bushing, and the mounting hole and the connecting hole are fastened and connected by a fastener.

[0019] In some embodiments, the pressing assembly includes:

[0020] A cylinder connected to the base plate;

[0021] A telescopic portion, the telescopic portion is transmission-connected to the cylinder so as to be displaced in the axial direction;

[0022] The pressing portion is connected to the telescopic portion, and driven by the telescopic portion, moves axially up and down in a direction approaching or away from the sensor bushing.

[0023] In some embodiments, the pressing portion includes:

[0024] A pressing plate connected to the telescopic portion and having a first surface for abutting against an upper surface of the sensor bushing;

[0025] A force sensor is connected to the second surface of the pressure plate facing away from the sensor bushing, and is used to detect a calibrated pressure applied to the sensor bushing.

[0026] In some embodiments, a plurality of support columns are protruding from one side of the bottom plate facing the cylinder, and the plurality of support columns are respectively passed through a mounting plate connected to the cylinder.

[0027] In some embodiments, the device further comprises:

[0028] An inflatable member is connected to the air inlet and is used to input the pressure gas in a predetermined pressure range into the air inlet groove so as to inflate the portion of the airbag assembly exposed on the side of the gas diverter plate away from the bottom plate.

[0029] In some embodiments, the sensor bushing is customized according to different models and sizes of the knee joint array pressure sensor, and is detachably connected to a side of the gas diverter plate facing away from the bottom plate.

[0030] Compared with the prior art, the beneficial effects of this application include:

[0031] On the one hand, by providing a sensor bushing that matches the shape of the knee joint array pressure sensor housing, the calibration device of the present application can adapt to knee joint pressure sensors of different shapes and sizes, and has higher versatility and flexibility. On the other hand, by providing an airbag assembly, the expansion of the airbag assembly can fit the outer curved surface of the knee joint array pressure sensor well, ensuring that the expansion pressure of the airbag assembly can act evenly on the outer curved surface of the knee joint array pressure sensor. In this way, not only can the test points of all the sensing units of the knee joint array pressure sensor be calibrated at one time, but it can also ensure that the pressure on each test point is uniform, thereby improving the efficiency and accuracy of the calibration of the knee joint array pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0033] Figure 1 is a schematic structural diagram of a knee joint pressure sensor in a calibration device for a knee joint array pressure sensor according to an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the overall structure of a calibration device for a knee joint array pressure sensor according to an embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of the local structure of a calibration device for a knee joint array pressure sensor according to an embodiment of the present application.

[0036] Explanation of the accompanying drawings: 100-calibration device; 1-bottom plate; 11-air inlet groove; 12-air inlet; 2-gas diverter plate; 21-diverter hole; 22-connecting hole; 3-airbag assembly; 31-airbag; 4-sensor bushing; 5-pressing assembly; 51-pressing part; 511-pressure plate; 5111-first surface; 5112-second surface; 512-force sensor; 52-cylinder; 53 telescopic part; 54-mounting plate; 6-airbag fixing part; 7-seal; 71-mounting hole; 8-support column; 200-knee joint array pressure sensor. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] All terms (including technical and scientific terms) used in this application have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used here should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0039] For example, the terms "first", "second", etc. used in this application may be used in this document to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

[0040] For another example, the terms “include”, “comprising”, etc. used in this application indicate the existence of features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0041] Figure 1 FIG. 1 is a schematic diagram of the structure of a knee joint array pressure sensor 200 in a calibration device 100 for a knee joint array pressure sensor according to an embodiment of the present application. Figure 1 As shown, the knee joint array pressure sensor 200 is a double concave special-shaped package shell. Therefore, the traditional pressure calibration method is usually a single-point test with a pin. However, the single-point test with a pin has many test points, a large amount of work, and inconsistent test repeatability between each point, resulting in low calibration efficiency and difficulty in ensuring accuracy. In practical applications, in order to match the knee joints of different people, the knee joint array pressure sensor 200 needs to be customized with shells of different shapes. Although the customized pressure calibration device of matching size can perform array calibration, it cannot adapt to all types of knee joint array pressure sensors 200, nor can it be completely matched with the package shell of the knee joint array pressure sensor 200, resulting in the inability to accurately apply the same pressure for calibration. For this reason, the present application proposes a calibration device 100 for a knee joint array pressure sensor, which can not only adapt to knee joint array pressure sensors 200 of different shapes and sizes, but also ensure that the pressures on each test point on the knee joint array pressure sensor 200 are uniform and consistent, thereby improving the efficiency and accuracy of the knee joint array pressure sensor calibration.

[0042] Figure 2 is a schematic diagram of the overall structure of a calibration device 100 for a knee joint array pressure sensor according to an embodiment of the present application, Figure 3 FIG. 1 is a schematic diagram of a partial structure of a calibration device 100 for a knee joint array pressure sensor according to an embodiment of the present application. Figure 2 and Figure 3 As shown, the calibration device 100 of the knee joint array pressure sensor of this embodiment includes:

[0043] A bottom plate 1, wherein an air inlet groove 11 is concavely formed on the upper surface of the bottom plate 1, and an air inlet 12 communicating with the outside is penetrated through the groove wall of the air inlet groove 11;

[0044] A gas diverter plate 2, the gas diverter plate 2 is connected to the side of the upper surface of the gas inlet groove 11 facing the bottom plate 1, and the gas diverter plate 2 is penetrated by diverter holes 21 arranged at intervals, and the diverter holes 21 are respectively connected to the gas inlet groove 11;

[0045] An airbag assembly 3, the airbag assembly 3 is correspondingly penetrated and fixed to the diverter hole 21, and has a portion exposed on a side of the gas diverter plate 2 away from the bottom plate 1;

[0046] A sensor bushing 4, wherein the sensor bushing 4 is sealed and connected to a side of the gas manifold plate 2 away from the bottom plate 1, and the sensor bushing 4 is provided with a chamber matching the shape of the shell of the knee joint array pressure sensor 200, so as to accommodate the knee joint array pressure sensor 200;

[0047] A pressing component 5, the pressing component 5 is fixedly connected to the base plate 1 and is provided with an axially displaceable pressing portion 51, the pressing portion 51 being used to abut against the upper surface of the sensor bushing 4;

[0048] When pressurized gas is introduced into the air inlet 12, the airbag assembly 3 inputs the pressurized gas respectively through the diversion hole 21, so that the part exposed on the side of the gas diversion plate 2 away from the base plate 1 expands to fit the outer curved surface of the knee joint array pressure sensor 200 and apply a calibrated pressure to the outer curved surface.

[0049] The bottom plate 1 in this embodiment is the basic supporting structure of the calibration device 100 of the knee joint array pressure sensor. The air inlet groove 11 and the air inlet 12 are designed to introduce pressurized gas to provide a power source for the airbag assembly 3 to expand.

[0050] In some embodiments, the air inlet 12 can accurately control the inflow and pressure of the pressurized gas through an adjustable valve, pump or other control device, thereby achieving precise control of the expansion degree of the airbag assembly 3 and the calibrated pressure applied to the outer surface of the knee joint array pressure sensor 200.

[0051] In some embodiments, the calibration device 100 of the knee joint array pressure sensor also includes an inflatable component, which is connected to the air inlet 12 and is used to input the pressure gas in a predetermined pressure range into the air inlet groove 11, so that the part of the airbag assembly 3 exposed on the side of the gas diverter plate 2 away from the bottom plate 1 expands. In one embodiment, the inflatable component includes an air compressor. The air compressor can apply 0~1Mpa pressure gas to the airbag assembly 3, which enters the air inlet groove 11 through the air inlet 12 of the bottom plate 1, so as to input pressure gas in a predetermined pressure range into the airbag assembly 3.

[0052] The gas distribution plate 2 in this embodiment can evenly distribute the pressurized gas entering from the air inlet 12 to each distribution hole 21, thereby making the airbag assembly 3 expand evenly.

[0053] In some embodiments, a receiving groove is recessed on one side of the gas diversion plate 2 facing the sensor bushing 4, and the receiving groove is used for inserting the raised portion of the knee joint array pressure sensor 200 to ensure that the knee joint array pressure sensor 200 is correctly installed and stably fixed, while ensuring good contact between the knee joint array pressure sensor 200 and the sensor bushing 4, ensuring the consistency of pressure distribution of each sensor unit array in the knee joint array pressure sensor 200, thereby ensuring the accuracy and reliability of pressure calibration.

[0054] The airbag assembly 3 in this embodiment expands under the action of the pressurized gas, thereby fitting the outer curved surface of the knee joint array pressure sensor 200 and applying a calibrated pressure, so that the calibrated pressure can be evenly distributed on the entire outer curved surface. In order to achieve the above-mentioned technical effects, the airbag assembly 3 is preferably made of highly elastic materials such as silicone balloons or polyurethane films. Among them, the silicone balloon has excellent elastic recovery ability, which can ensure that it quickly returns to its original state after the release of the pressurized gas, and is easy to reuse. The polyurethane film is known for its excellent wear resistance and anti-aging properties. It can maintain good physical properties for a long time and extend the service life of the airbag assembly 3.

[0055] In some embodiments, the gas diversion plate 2 is penetrated by two left and right diversion holes 21 spaced apart from each other, and the airbag assembly 3 includes two airbags 31 correspondingly penetrated and fixed to the two diversion holes 21, and the two airbags 31 both have a portion exposed on the side of the gas diversion plate 2 away from the bottom plate 1.

[0056] When the air inlet 12 is introduced with pressurized gas, the two airbags 31 respectively input the pressurized gas through the two diverter holes 21, so that the part exposed on the side of the gas diverter plate 2 away from the bottom plate 1 expands to respectively fit the left and right outer curved surfaces of the knee joint array pressure sensor 200 and apply a calibration pressure to the left and right outer curved surfaces. The left and right outer curved surfaces of the knee joint array pressure sensor 200 are formed on the left and right sides of the raised portion.

[0057] In some embodiments, the calibration device 100 of the knee joint array pressure sensor further includes an airbag fixing component 6, which is fixedly connected to the opening edges of the two diversion holes 21 facing the bottom plate 1, and is used to fasten the two airbags 31 respectively.

[0058] The sensor bushing 4 in this embodiment is used to ensure that the knee joint array pressure sensor 200 can maintain a stable position during the calibration process and make good contact with the airbag assembly 3, ensuring that the calibration pressure is accurately applied to the outer curved surface of the knee joint array pressure sensor 200. The sensor bushing 4 can be made of polytetrafluoroethylene (PTFE), which has excellent chemical resistance and heat resistance, and a very low sliding friction coefficient. It can reduce the wear of the packaging shell of the knee joint array pressure sensor 200 during the installation and removal of the knee joint array pressure sensor 200, and can better adapt to the packaging shell of the knee joint array pressure sensor 200 to improve the overall stability.

[0059] It should be noted that when the knee joint array pressure sensor 200 is accommodated in the sensor bushing 4, the knee joint array pressure sensor 200 is slightly lower than the upper surface of the sensor bushing 4. In one embodiment, the knee joint array pressure sensor 200 may be 0.5 mm lower than the upper surface of the sensor bushing 4, so that the knee joint array pressure sensor 200 is in a state of being free of stress before the pressure calibration begins.

[0060] In some embodiments, the sensor bushing 4 is customized according to different models and sizes of the knee joint array pressure sensor 200, and is detachably connected to the side of the gas manifold plate 2 away from the bottom plate 1. When it is necessary to calibrate the knee joint array pressure sensor 200 of different models and sizes, it is only necessary to replace the sensor bushing 4 adapted to the knee joint array pressure sensor 200 of different models and sizes.

[0061] In some embodiments, the calibration device 100 of the knee joint array pressure sensor also includes a seal 7, which is sleeved on the outer peripheral side of the sensor bushing 4 and is used to form a sealed connection around the sensor bushing 4 and the gas diverter plate 2 to ensure that the connection between the sensor bushing 4 and the gas diverter plate 2 is well sealed to prevent the intrusion of external impurities such as dust and moisture, thereby ensuring the stability of the internal pressure of the airbag assembly 3 during the calibration process.

[0062] Specifically, the seal 7 is provided with a mounting hole 71, and the gas diverter plate 2 is provided with a connecting hole 22 on one side facing the sensor bushing 4, and the mounting hole 71 and the connecting hole 22 are fastened and connected by a fastener. The fastener may be a screw, a bolt or other type of connecting member, which can pass through the mounting hole 71 of the seal 7 and the connecting hole 22 of the gas diverter plate 2 to fasten the two together, so as to ensure that the connection between the seal 7 and the gas diverter plate 2 is stable and reliable, and prevent loosening during the calibration process.

[0063] The pressing component 5 in this embodiment can apply supporting pressure to the upper surface of the sensor bushing 4 during the calibration process through the axial displacement characteristic of its pressing part 51. Due to the pressing and supporting effect of the pressing part 51 on the upper surface of the sensor bushing 4, when the airbag component 3 inputs pressure gas in a predetermined air pressure range, fits the left and right outer curved surfaces of the knee joint array pressure sensor 200 and applies calibration pressure to the left and right outer curved surfaces, the pressing part 51 can prevent the knee joint array pressure sensor 200 from being ejected from the sensor bushing 4, and can ensure the uniformity of the distribution of the calibration pressure transmitted to the outer curved surface of the knee joint array pressure sensor 200 through the airbag 31. In this way, the calibration pressure applied to the knee joint array pressure sensor 200 can be accurately controlled and measured, thereby improving the accuracy and reliability of the measurement. And due to the presence of the airbag 31, the error caused by the mechanical structure can be reduced, thereby improving the accuracy of the measurement.

[0064] In some embodiments, the pressing component 5 further includes:

[0065] A cylinder 52, wherein the cylinder 52 is connected to the base plate 1;

[0066] The telescopic portion 53 is transmission-connected to the cylinder 52 to be displaced in the axial direction;

[0067] The pressing portion 51 is connected to the telescopic portion 53 , and driven by the telescopic portion 53 , moves axially up and down in a direction approaching or moving away from the sensor bushing 4 .

[0068] The air cylinder 52 in this embodiment is a device that converts the pressure energy of compressed air into mechanical energy, and is connected to the bottom plate 1 to provide a power source for the entire pressing assembly 5. The air cylinder 52 can be simultaneously supplied with air by an air compressor that inputs pressurized gas to the air inlet 12, ensuring that the air cylinder 52 has sufficient pressure to drive the pressing portion 51 to press against the upper surface of the sensor bushing 4.

[0069] The telescopic portion 53 in this embodiment is a mechanism that can perform telescopic movement in the axial direction. It is connected to the cylinder 52, and performs telescopic movement through the power provided by the cylinder 52, thereby driving the pressing portion 51 to move up and down in the axial direction close to or away from the sensor bushing 4.

[0070] In some embodiments, the pressing portion 51 includes:

[0071] A pressing plate 511 , the pressing plate 511 being connected to the telescopic portion 53 and having a first surface 5111 for abutting against an upper surface of the sensor bushing 4 ;

[0072] The force sensor 512 is connected to a second surface 5112 of the pressure plate 511 facing away from the sensor bushing 4 , and is used to detect a calibrated pressure applied to the sensor bushing 4 .

[0073] The pressure plate 511 in this embodiment has a first surface 5111 for abutting against the upper surface of the sensor bushing 4. The pressure plate 511 is connected to the telescopic portion 53, and can be driven by the telescopic portion 53 to move axially up and down in a direction close to or away from the sensor bushing 4, thereby applying pressure to the upper surface of the sensor bushing 4.

[0074] The force sensor 512 in this embodiment is connected to the second surface 5112 of the pressure plate 511 (i.e., the side facing away from the sensor bushing 4) and is used to detect the calibration pressure applied to the sensor bushing 4. The detected calibration pressure can be used to calibrate the knee joint array pressure sensor 200 in combination with the input air pressure of the airbag assembly 3 and the sensing capacitance value of the knee joint array pressure sensor 200.

[0075] In some embodiments, a plurality of support columns 8 are protruded from one side of the base plate 1 facing the cylinder 52, and the plurality of support columns 8 are respectively passed through a mounting plate 54 connected to the cylinder 52 to ensure that the cylinder 52 can be stably mounted on the base plate 1, thereby ensuring the overall stability of the calibration device 100 for the knee joint array pressure sensor. At the same time, it can also absorb vibrations and disperse loads to a certain extent, thereby improving the reliability and service life of the calibration device 100 for the knee joint array pressure sensor.

[0076] In this embodiment, on the one hand, by providing a sensor bushing 4 that matches the outer shell shape of the knee joint array pressure sensor 200, the calibration device 100 of the present application can adapt to knee joint array pressure sensors 200 of different shapes and sizes, and has higher versatility and flexibility. On the other hand, by providing an airbag assembly 3, the expansion of the airbag assembly 3 can fit the outer curved surface of the knee joint array pressure sensor 200 well, ensuring that the expansion pressure of the airbag assembly 3 can act evenly on the outer curved surface of the knee joint array pressure sensor 200. In this way, not only can the pressure of the test points of all the sensing units of the knee joint array pressure sensor 200 be calibrated at one time, but it can also ensure that the pressure on each test point is uniform, thereby improving the efficiency and accuracy of the calibration of the knee joint array pressure sensor 200.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0078] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A calibration device for a knee joint array pressure sensor, characterized in that: The device comprises: A bottom plate, wherein an air inlet groove is concavely formed on the upper surface of the bottom plate, and an air inlet port communicating with the outside is penetrated through the groove wall of the air inlet groove; A gas diverter plate, the gas diverter plate is connected to the side of the upper surface of the gas inlet groove facing the bottom plate, the gas diverter plate is penetrated by diverter holes arranged at intervals, and the diverter holes are respectively connected to the gas inlet groove; An airbag assembly, the airbag assembly is correspondingly penetrated and fixed to the diverter hole, and has a portion exposed on a side of the gas diverter plate away from the bottom plate; A sensor bushing, the sensor bushing is sealingly connected to a side of the gas diverter plate away from the bottom plate, and the sensor bushing is provided with a chamber matching the shape of the shell of the knee joint array pressure sensor for accommodating the knee joint array pressure sensor; A pressing assembly, the pressing assembly is fixedly connected to the bottom plate and is provided with an axially displaceable pressing portion, the pressing portion being used to abut against the upper surface of the sensor bushing; When pressurized gas is introduced into the air inlet, the airbag assembly inputs the pressurized gas respectively through the diversion holes, so that the part exposed on the side of the gas diversion plate away from the bottom plate expands to fit the outer curved surface of the knee joint array pressure sensor and apply a calibrated pressure to the outer curved surface.

2. The calibration device for the knee joint array pressure sensor according to claim 1, characterized in that: The gas diverter plate is penetrated by two left and right diverter holes arranged at intervals, the airbag assembly includes two airbags correspondingly penetrated and fixed to the two diverter holes, and the two airbags both have a portion exposed on a side of the gas diverter plate away from the bottom plate; Among them, when the air inlet is introduced into the pressurized gas, the two air bags respectively input the pressurized gas through the two diversion holes, so that the part exposed on the side of the gas diversion plate away from the bottom plate expands, so as to respectively fit the left and right outer curved surfaces of the knee joint array pressure sensor and apply a calibrated pressure to the left and right outer curved surfaces.

3. The calibration device for the knee joint array pressure sensor according to claim 2, characterized in that: The device also includes: An airbag fixing member is fixedly connected to the opening edges of the two diversion holes facing the bottom plate, and is used for respectively fastening the two airbags.

4. The calibration device for the knee joint array pressure sensor according to claim 1, characterized in that: The device also includes: A sealing member is sleeved on the outer peripheral side of the sensor bushing and is used to form a sealed connection between the sensor bushing and the periphery of the gas diverter plate.

5. The calibration device for the knee joint array pressure sensor according to claim 4, characterized in that: The sealing member is provided with a mounting hole through it, and a connecting hole is provided on a side of the gas diverter plate facing the sensor bushing, and the mounting hole and the connecting hole are fastened and connected by a fastener.

6. The calibration device for the knee joint array pressure sensor according to claim 1, characterized in that: The pressing component comprises: A cylinder connected to the base plate; A telescopic portion, the telescopic portion is transmission-connected to the cylinder so as to be displaced in the axial direction; The pressing portion is connected to the telescopic portion, and driven by the telescopic portion, moves axially up and down in a direction approaching or away from the sensor bushing.

7. The calibration device for the knee joint array pressure sensor according to claim 6, characterized in that: The pressing portion comprises: A pressing plate connected to the telescopic portion and having a first surface for abutting against an upper surface of the sensor bushing; A force sensor is connected to the second surface of the pressure plate facing away from the sensor bushing, and is used to detect a calibrated pressure applied to the sensor bushing.

8. The calibration device for the knee joint array pressure sensor according to claim 6, characterized in that: A plurality of support columns are protrudingly provided on one side of the bottom plate facing the cylinder, and the plurality of support columns are respectively passed through a mounting plate connected to the cylinder.

9. The calibration device for the knee joint array pressure sensor according to claim 1, characterized in that: The device also includes: An inflatable member is connected to the air inlet and is used to input the pressure gas in a predetermined pressure range into the air inlet groove so as to inflate the portion of the airbag assembly exposed on the side of the gas diverter plate away from the bottom plate.

10. The calibration device for the knee joint array pressure sensor according to claim 1, characterized in that: The sensor bushing is customized according to different models and sizes of the knee joint array pressure sensor, and is detachably connected to a side of the gas diverter plate facing away from the bottom plate.

Images