Calibration device of in-vivo intervention type optical fiber sensor

Abstract

The utility model relates to the technical field of optical fiber sensor calibration, and provides an in vivo intervention type optical fiber sensor calibration device, which comprises a simulation bin, a fixing mechanism, a sensor and a temperature and pressure adjusting device, and is characterized in that the fixing mechanism comprises a sleeve, a rotary drum and a soft plug, and the rotary drum is detachably fixed at one end, far away from the simulation bin, of the sleeve; the soft plug is arranged in the sleeve, and the two ends of the soft plug abut against the sleeve and the rotary drum respectively. The sensor comprises a thermocouple, a pressure sensor and a sensor to be detected; and the temperature and pressure adjusting device is arranged on the simulation bin. The thermocouple, the pressure sensor and the sensor to be tested can be connected to the simulation bin in a sealed mode through the sleeve, the rotating cylinder and the soft plug, the temperature and pressure in the simulation bin are adjusted in cooperation with the temperature and pressure adjusting device, and the error and offset of the sensor to be tested can be determined; and subsequent calibration and correction operations of the sensor to be measured are carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber optic sensor calibration, and particularly to a calibration device for an in-vivo interventional fiber optic sensor. Background Art

[0002] Minimally invasive interventional surgery carried out by interventional medical devices is the development direction of medical technology and has developed rapidly in the treatment of cardiovascular and cerebrovascular diseases. Due to characteristics such as corrosion resistance, insensitivity to electromagnetic radiation, and good biocompatibility, fiber optic sensors have been widely used in interventional medical devices.

[0003] To solve the problem of the single function of fiber optic sensors, comprehensive research has been carried out on fiber optic sensors. For example, a fiber optic sensor capable of simultaneously measuring temperature and pressure disclosed in the invention patent with the publication number of CN101929879B can not only endow the fiber optic sensor with the function of simultaneously detecting in-vivo temperature and in-vivo pressure, but also solve the problem of mutual interference between temperature detection and pressure detection.

[0004] However, affected by factors such as heartbeat, breathing, and body position changes, the pressure and temperature in the human body change extremely complexly. When the temperature sensing module and pressure sensing module in the fiber optic sensor are simultaneously affected by this temperature and pressure, it is difficult to ensure the accuracy of its measurement results. Therefore, in practical applications, to ensure the accuracy and stability of the detection results of the fiber optic sensor, it is necessary to calibrate and correct the fiber optic sensor in advance. Summary of the Utility Model

[0005] In view of this, the utility model provides a calibration device for an in-vivo interventional fiber optic sensor, which can determine the error and offset of the fiber optic sensor for subsequent calibration and correction operations.

[0006] The technical solution of the utility model is realized as follows: The utility model provides a calibration device for an in-vivo interventional fiber optic sensor, including a simulation chamber, a fixing mechanism, a sensor, and a temperature and pressure adjusting device, wherein,

[0007] The fixing mechanism includes a sleeve, a rotating cylinder, and a soft plug. The sleeve is fixedly penetrated on the simulation chamber, and the inner diameter of the end far from the simulation chamber is larger than the inner diameter of the end close to the simulation chamber; the rotating cylinder is detachably fixed at the end of the sleeve far from the simulation chamber; the soft plug is arranged in the sleeve, and its two ends are respectively abutted against the sleeve and the rotating cylinder;

[0008] The sensor includes a thermocouple, a pressure sensor, and a sensor to be measured, and all three are hermetically fixed in the soft plug and penetrate through the simulation chamber;

[0009] The temperature and pressure regulating device is arranged on the simulation chamber and is used to regulate the temperature and pressure in the simulation chamber.

[0010] Based on the above technical solutions, preferably, a connection hole, a through hole and a sealing hole are formed in the sleeve. Among them,

[0011] The connection hole is formed at one end of the sleeve away from the simulation chamber, and the rotary cylinder is detachably fixed in the connection hole;

[0012] The through hole is formed at one end of the sleeve close to the simulation chamber, and the thermocouple, the pressure sensor and the sensor to be measured are arranged through the through hole and the rotary cylinder;

[0013] The sealing hole is formed in the sleeve, and both ends of the sealing hole are respectively communicated with the connection hole and the through hole. The inner diameter of the sealing hole gradually decreases along the direction from the end of the sleeve away from the simulation chamber to the end of the sleeve close to the simulation chamber, and one end of the soft plug is located in the sealing hole.

[0014] More preferably, the outer diameter of the soft plug gradually decreases along the direction from the end away from the simulation chamber to the end close to the simulation chamber.

[0015] More preferably, the rotary cylinder and the connection hole are connected by screw fit.

[0016] Based on the above technical solutions, preferably, the simulation chamber includes a bottom box, an upper cover and a support platform. Among them,

[0017] The upper cover is detachably fixed on the bottom box and is hermetically connected to it;

[0018] The support platform is fixedly arranged in the bottom box.

[0019] More preferably, the upper cover is of a spherical top structure, and the sleeve is fixedly penetrated through the middle position of the upper cover.

[0020] Based on the above technical solutions, preferably, the temperature and pressure regulating device includes a pressure regulating mechanism and a TEC refrigeration chip. Among them,

[0021] The pressure regulating mechanism includes a plug cylinder and a piston rod. One end of the plug cylinder is communicated with the inside of the simulation chamber; the piston rod is slidably arranged in the plug cylinder and is hermetically connected to it;

[0022] The TEC refrigeration chip is fixedly arranged in the simulation chamber.

[0023] More preferably, the pressure regulating mechanism further includes a base, a lead screw, a motor and a slider. Among them,

[0024] The lead screw is rotatably arranged on the base;

[0025] The motor and the plug cylinder are both fixedly arranged on the base, and the output end of the motor is fixedly connected to the lead screw coaxially;

[0026] The slider is slidably arranged on the base, and is connected to the lead screw by screw thread fit, and one end of the piston rod away from the simulation chamber is fixedly arranged on the slider.

[0027] On the basis of the above technical solutions, preferably, the fixing mechanism further includes two clamping rings, the clamping rings are connected to the outside of the sleeve by screw thread fit, and the two clamping rings respectively abut against the inner and outer sides of the simulation chamber.

[0028] More preferably, the simulation chamber further includes a sealing ring, the sealing ring is fixedly arranged on one of the bottom box and the upper cover, and is in sealing abutment with the other of the bottom box and the upper cover.

[0029] The calibration device of the in-vivo interventional optical fiber sensor of the present utility model has the following beneficial effects compared with the prior art:

[0030] (1) By arranging the sleeve, the rotating cylinder and the soft plug, the thermocouple, the pressure sensor and the sensor to be measured can be hermetically connected to the simulation chamber. With the adjustment of the temperature and pressure inside the simulation chamber by the temperature and pressure adjustment device, the error and offset of the sensor to be measured can be determined, so as to perform subsequent calibration and correction operations on the sensor to be measured;

[0031] (2) By arranging the motor, the lead screw, the slider, the piston rod and the plug cylinder, not only can the piston rod be accurately controlled, but also the reciprocating movement of the piston rod can be realized, so that the simulation chamber can simulate different working conditions. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0033] Figure 1 It is a cross-sectional view of the calibration device of the in-vivo interventional optical fiber sensor of the present utility model;

[0034] Figure 2 It is an exploded view of the fixing mechanism in the calibration device of the in-vivo interventional optical fiber sensor of the present utility model;

[0035] Figure 3 The sectional view of the sleeve in the calibration device of an in-vivo interventional fiber optic sensor of the present utility model;

[0036] Figure 4 The perspective view of the pressure regulating mechanism in the calibration device of an in-vivo interventional fiber optic sensor of the present utility model;

[0037] Figure 5 The exploded view of the simulation chamber in the calibration device of an in-vivo interventional fiber optic sensor of the present utility model.

[0038] Wherein: 1. Simulation chamber; 11. Bottom box; 12. Upper cover; 13. Support platform; 14. Sealing ring; 2. Fixing mechanism; 21. Sleeve; 22. Rotating cylinder; 23. Soft plug; 24. Clamping ring; 201. Connecting hole; 202. Through hole; 203. Sealing hole; 3. Sensor; 31. Thermocouple; 32. Pressure sensor; 33. Sensor to be measured; 4. Temperature and pressure regulating device; 41. Pressure regulating mechanism; 411. Base; 412. Lead screw; 413. Motor; 414. Slide block; 415. Plug cylinder; 416. Piston rod; 42. TEC refrigeration chip. Specific embodiments

[0039] Next, in combination with the specific embodiments of the present utility model, the technical solutions in the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model.

[0040] As Figures 1-5 shown, a calibration device for an in-vivo interventional fiber optic sensor of the present utility model includes a simulation chamber 1, a fixing mechanism 2, a sensor 3, and a temperature and pressure regulating device 4, which are used to simulate the temperature and pressure in the in-vivo environment to clarify the measurement error and offset of the fiber optic sensor (specifically, a fiber optic sensor with temperature detection function and pressure detection function), so as to perform subsequent calibration and correction operations on the fiber optic sensor, and improve the accuracy and stability of the detection results of the fiber optic sensor. The calibration method and correction method of the fiber optic sensor are prior arts.

[0041] Among them, the simulation chamber 1 is used to provide an environment for the error clarification operation of the fiber optic sensor, and the simulation chamber 1 is a hollow structure.

[0042] The sensor 3 includes a thermocouple 31, a pressure sensor 32, and a sensor under test 33. The thermocouple 31 is used to detect the temperature inside the simulation chamber 1, the pressure sensor 32 is used to detect the pressure inside the simulation chamber 1, and the sensor under test 33 is an optical fiber sensor that needs to be calibrated and corrected, which can detect the pressure and temperature inside the simulation chamber 1. The thermocouple 31, the pressure sensor 32, and the sensor under test 33 penetrate the simulation chamber 1, that is, one end of the thermocouple 31, the pressure sensor 32, and the sensor under test 33 is arranged inside the simulation chamber 1 to realize the detection function, and the other end is arranged outside the simulation chamber 1 to realize the electrical connection with relevant acquisition and display devices.

[0043] The fixing mechanism 2 is used to seal and fix the sensor 3 on the simulation chamber 1. The fixing mechanism 2 includes a sleeve 21, a rotating cylinder 22, and a soft plug 23. The sleeve 21 penetrates and is fixed on the simulation chamber 1 and is hermetically connected to it. The inner diameter of the sleeve 21 at the end far from the simulation chamber 1 is larger than the inner diameter of the end close to the simulation chamber 1, where the end far from the simulation chamber 1 refers to the end located outside the simulation chamber 1, and the end close to the simulation chamber 1 refers to the end located inside the simulation chamber 1. The soft plug 23 is arranged inside the sleeve 21. The outer diameter of the soft plug 23 is larger than the inner diameter of the sleeve 21 at the end close to the simulation chamber 1 and smaller than the inner diameter of the sleeve 21 at the end far from the simulation chamber 1, so that the soft plug 23 stays inside the sleeve 21. The thermocouple 31, the pressure sensor 32, and the sensor under test 33 are all hermetically fixed inside the soft plug 23. The rotating cylinder 22 is detachably fixed at the end of the sleeve 21 far from the simulation chamber 1, and both ends of the soft plug 23 are abutted against the sleeve 21 and the rotating cylinder 22 respectively. By using the abutment of the sleeve 21 and the rotating cylinder 22 on the soft plug 23, the soft plug 23 can be squeezed and deformed to fill the gap between the sensor 3 and the sleeve 21, realizing the sealed connection between the sensor 3 and the sleeve 21 and between the sensor 3 and the simulation chamber 1.

[0044] The temperature and pressure regulating device 4 is used to regulate the temperature and pressure inside the simulation chamber 1. The temperature and pressure regulating device 4 is arranged on the simulation chamber 1. By using the temperature and pressure regulating device 4, the temperature and pressure inside the simulation chamber 1 can be regulated to be the same as the temperature and pressure in the human body. At this time, since the thermocouple 31 and the pressure sensor 32 are independent of each other, a set of accurate temperature values and pressure values can be detected respectively, and the sensor under test 33 will also detect a set of temperature values and pressure values. By comparing the two sets of temperature values and pressure values, the error and offset of the sensor under test 33 can be determined.

[0045] The fixing mechanism 2 further includes two clamping rings 24, which can make the sleeve 21 penetrate and be slidably arranged on the simulation chamber 1. The clamping rings 24 are connected to the outside of the sleeve 21 by thread fit, and the two clamping rings 24 are respectively abutted against the inner and outer sides of the simulation chamber 1, so as to facilitate the disassembly and assembly of the sleeve 21 and the simulation chamber 1.

[0046] The sleeve 21 is provided with a connection hole 201, a through hole 202 and a sealing hole 203. The connection hole 201 is opened at one end of the sleeve 21 away from the simulation chamber 1, and the rotating cylinder 22 is detachably fixed in the connection hole 201; the through hole 202 is opened at one end of the sleeve 21 close to the simulation chamber 1. The thermocouple 31, the pressure sensor 32 and the sensor to be measured 33 are arranged through the rotating cylinder 22 and the through hole 202, and are spaced from them; the sealing hole 203 is opened in the sleeve 21, and both ends of it are respectively communicated with the connection hole 201 and the through hole 202. The inner diameter of the sealing hole 203 gradually decreases along the direction from the end of the sleeve 21 away from the simulation chamber 1 to the end of the sleeve 21 close to the simulation chamber 1, and one end of the soft plug 23 is located in the sealing hole 203; as Figure 3 shown, the sealing hole 203 has a tapered structure with a wider upper part and a narrower lower part. As Figure 2 shown, when the rotating cylinder 22 is connected to the sleeve 21, the soft plug 23 can be extruded, so that the soft plug 23 is extruded and deformed to fill the gap between the sensor 3 and the sealing hole 203.

[0047] In order to make the soft plug 23 more easily deformed, the outer diameter of the soft plug 23 can be gradually decreased along the direction from the end of it away from the simulation chamber 1 to the end of it close to the simulation chamber 1 to adapt to the shape of the sealing hole 203; and in order to facilitate the connection and adjustment of the rotating cylinder 22 and the sleeve 21, it is preferably that the rotating cylinder 22 is connected to the connection hole 201 by thread fit, so as to extrude the soft plug 23 to different degrees.

[0048] As Figure 5 shown, the simulation chamber 1 includes a bottom box 11, an upper cover 12, a support table 13 and a sealing ring 14. The upper cover 12 is detachably fixed on the bottom box 11 and is sealed with it; the support table 13 is fixedly arranged in the bottom box 11; when the temperature and pressure in the simulation chamber 1 are the same as those in the human body, the ex vivo tissue can be placed on the support table 13, and the ex vivo tissue on the support table 13 can be detected by the sensor 33 to be measured after calibration and correction to simulate in vivo detection; of course, the cavity between the bottom box 11 and the upper cover 12 is sealed, and not only air but also tissue fluid can be filled.

[0049] The upper cover 12 has a spherical top structure, and the sleeve 21 is fixedly penetrated through the middle position of the upper cover 12, which is helpful for the optimized design of the overall structure of the simulation chamber 1.

[0050] The sealing ring 14 is fixedly arranged on one of the bottom box 11 and the upper cover 12 and is in sealing contact with the other of the bottom box 11 and the upper cover 12, thereby improving the connection sealing performance between the bottom box 11 and the upper cover 12.

[0051] The temperature and pressure adjustment device 4 includes a pressure adjustment mechanism 41 and a TEC cooling chip 42. The pressure adjustment mechanism 41 is used to adjust the pressure in the simulation chamber 1, and the TEC cooling chip 42 is used to adjust the temperature in the simulation chamber 1.

[0052] The pressure adjustment mechanism 41 includes a base 411, a lead screw 412, a motor 413, a slider 414, a plug cylinder 415 and a piston rod 416. The lead screw 412 is rotatably arranged on the base 411; the motor 413 is fixedly arranged on the base 411, and the output end of the motor 413 is coaxially and fixedly connected with the lead screw 412; the slider 414 is slidably arranged on the base 411 and is in threaded engagement with the lead screw 412; the plug cylinder 415 is fixedly arranged on the base 411, and one end of the plug cylinder 415 is communicated with the inside of the simulation chamber 1; the piston rod 416 is slidably arranged in the plug cylinder 415 and is hermetically connected thereto, and the end of the piston rod 416 away from the simulation chamber 1 is fixedly arranged on the slider 414; when the motor 413 is started, the lead screw 412 can be driven to rotate. By using the threaded engagement between the lead screw 412 and the slider 414 and the sliding engagement between the slider 414 and the base 411, the slider 414 can be driven to slide on the base 411, thereby driving the piston rod 416 to slide in the plug cylinder 415 to press the medium into the simulation chamber 1 or extract the medium in the simulation chamber 1, so as to realize the adjustment of the pressure in the simulation chamber 1.

[0053] By using the automatic control of the motor 413, the accuracy of the pressure adjustment in the simulation chamber 1 can be improved. At the same time, by using the reciprocating rotation of the motor 413, the cyclic change of the pressure in the simulation chamber 1 can be realized to simulate working conditions such as breathing, thereby improving the adaptability of the calibration device.

[0054] The temperature adjustment structure and principle of the TEC cooling chip 42 are prior art. The TEC cooling chip 42 is fixedly arranged in the simulation chamber 1, and the temperature in the simulation chamber 1 is adjusted by using its temperature change.

[0055] The usage method of a calibration device for an in-vivo interventional fiber optic sensor of the present utility model is as follows:

[0056] First, utilize the rotation of the output end of the motor 413 to control the synchronous movement of the slider 414 and the piston rod 416 to adjust the pressure in the simulation chamber 1. Utilize the temperature change of the TEC cooler 42 to adjust the temperature in the simulation chamber 1 until the pressure and temperature in the simulation chamber 1 are the same as those in the human body. Then record the temperature value and pressure value detected by the sensor to be measured 33 and the temperature value detected by the thermocouple 31 and the pressure value detected by the pressure sensor 32. Next, determine the error and offset of the sensor to be measured 33 by using the difference between the two sets of temperature values and pressure values. Finally, calibrate and correct the sensor to be measured 33 and repeat the above steps to detect whether there is still an offset in the sensor to be measured 33. During this period, the temperature and pressure in the simulation chamber 1 can also be changed step by step, which is helpful for the calibration and correction of the sensor to be measured 33.

[0057] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A calibration device for an in vivo invasive optical fiber sensor, characterized in that: It comprises a simulation chamber (1), a fixing mechanism (2), a sensor (3) and a temperature and pressure regulating device (4), wherein: The fixing mechanism (2) comprises a sleeve (21), a rotating cylinder (22) and a soft plug (23); the sleeve (21) penetrates and is fixed on the simulation chamber (1), and the inner diameter of the end thereof away from the simulation chamber (1) is larger than the inner diameter of the end thereof close to the simulation chamber (1); the rotating cylinder (22) is detachably fixed to the end of the sleeve (21) away from the simulation chamber (1); the soft plug (23) is arranged in the sleeve (21), and the two ends thereof are respectively abutted against the sleeve (21) and the rotating cylinder (22); The sensor (3) comprises a thermocouple (31), a pressure sensor (32) and a sensor to be tested (33), all of which are sealed and fixed in the soft plug (23) and penetrate the simulation chamber (1); The temperature and pressure regulating device (4) is arranged on the simulation chamber (1) and is used to regulate the temperature and pressure in the simulation chamber (1).

2. The calibration device for an in vivo invasive optical fiber sensor according to claim 1, characterized in that: The sleeve (21) is provided with a connecting hole (201), a through hole (202) and a sealing hole (203), wherein: The connecting hole (201) is formed at an end of the sleeve (21) away from the simulation chamber (1), and the rotating drum (22) is detachably fixed in the connecting hole (201); The through hole (202) is provided at one end of the sleeve (21) close to the simulation chamber (1), and the thermocouple (31), the pressure sensor (32) and the sensor to be tested (33) are arranged in the through hole (202) and in the rotating drum (22); The sealing hole (203) is provided in the sleeve (21), and its two ends are respectively connected to the connecting hole (201) and the through hole (202), the inner diameter of the sealing hole (203) gradually decreases along the direction from the end of the sleeve (21) away from the simulation chamber (1) to the end of the sleeve (21) close to the simulation chamber (1), and one end of the soft plug (23) is located in the sealing hole (203).

3. The calibration device for an in vivo invasive optical fiber sensor according to claim 2, characterized in that: The outer diameter of the soft plug (23) gradually decreases along the direction from its end away from the simulation chamber (1) to its end close to the simulation chamber (1).

4. The calibration device for an in vivo invasive optical fiber sensor according to claim 3, characterized in that: The rotating drum (22) is connected to the connecting hole (201) by threaded engagement.

5. The calibration device for an in vivo invasive optical fiber sensor according to claim 1, characterized in that: The simulation chamber (1) comprises a bottom box (11), an upper cover (12) and a support platform (13), wherein: The upper cover (12) is detachably fixed to the bottom box (11) and is sealed therewith; The support platform (13) is fixedly arranged in the bottom box (11).

6. The calibration device for an in vivo invasive optical fiber sensor according to claim 5, characterized in that: The upper cover (12) is a dome-shaped structure, and the sleeve (21) penetrates and is fixed at a middle position of the upper cover (12).

7. The calibration device for an in vivo invasive optical fiber sensor according to claim 1, characterized in that: The temperature and pressure regulating device (4) comprises a pressure regulating mechanism (41) and a TEC refrigeration sheet (42), wherein: The pressure regulating mechanism (41) comprises a plug barrel (415) and a piston rod (416), one end of the plug barrel (415) is connected to the interior of the simulation chamber (1); the piston rod (416) is slidably disposed in the plug barrel (415) and is sealed therewith; The TEC refrigeration sheet (42) is fixedly arranged in the simulation chamber (1).

8. The calibration device for an in vivo invasive optical fiber sensor according to claim 7, characterized in that: The pressure regulating mechanism (41) further comprises a base (411), a screw rod (412), a motor (413) and a slider (414), wherein: The screw rod (412) is rotatably disposed on the base (411); The motor (413) and the plug tube (415) are both fixedly arranged on the base (411), and the output end of the motor (413) is coaxially fixedly connected to the screw rod (412); The slider (414) is slidably disposed on the base (411) and is connected to the screw rod (412) through threaded engagement, and one end of the piston rod (416) away from the simulation chamber (1) is fixedly disposed on the slider (414).

9. The calibration device for an in vivo invasive optical fiber sensor according to claim 1, characterized in that: The fixing mechanism (2) further comprises two clamping rings (24), the clamping rings (24) being connected to the outside of the sleeve (21) by threaded engagement, and the two clamping rings (24) respectively abut against the inner and outer sides of the simulation chamber (1).

10. The calibration device for an in vivo invasive optical fiber sensor according to claim 5, characterized in that: The simulation chamber (1) further comprises a sealing ring (14), wherein the sealing ring (14) is fixedly arranged on one of the bottom box (11) and the upper cover (12), and is sealingly abutted against the other of the bottom box (11) and the upper cover (12).

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