Method for adjusting optical intracranial pressure monitoring device and optical intracranial pressure monitoring device

Abstract

The invention discloses an assembling and adjusting method of an optical intracranial pressure monitoring device and the optical intracranial pressure monitoring device. The assembling and adjusting method comprises the steps that S1, a detection light source is connected; the optical fiber port assembly is installed and adjusted, so that a light spot of emergent light of the light path outlet meets a first preset requirement; s2, the optical wedge assembly is pre-placed, so that interference fringes generated when the emergent light passes through the optical wedge assembly meet a second preset requirement; s3, the optical wedge assembly and the light beam shaping assembly are matched, so that interference fringes generated when the emergent light passes through the optical wedge assembly meet a third preset requirement; s4, the CCD data acquisition and processing module is installed and adjusted until a related interference signal is received; according to the assembling and adjusting method, the precision requirement of key components including the F-P optical fiber sensor and the optical wedge assembly is lowered, and the optical intracranial pressure monitoring device based on the Fizeau interferometer can be produced in an engineering and batch mode through the assembling and adjusting steps.

Description

Technical Field

[0001] The invention relates to the technical field of intracranial pressure monitoring instruments, and in particular to an installation and adjustment method of an optical intracranial pressure monitoring device and an optical intracranial pressure monitoring device. Background Art

[0002] Normal intracranial pressure in the human body is 0.9-2.0 kPa. Various neurological diseases can cause increased intracranial pressure. Therefore, monitoring intracranial pressure is of great significance in the clinical treatment of various neurological diseases such as intracranial injury, cerebrovascular disease, and meningitis. Intraventricular catheters and dura mater bolts are often used to detect intracranial pressure in clinical practice, but these methods have the disadvantages of difficult puncture, only reflecting local pressure, and easy infection. In recent years, minimally invasive treatment methods using sensor systems have become another important method for monitoring intracranial pressure. Compared with electrical sensors, fiber optic sensors have the characteristics of electromagnetic compatibility, small size, high sensitivity, and high resolution, and have attracted much attention. Compared with electrical sensors, fiber optic sensors have the characteristics of electromagnetic compatibility, small size, high sensitivity, and high resolution, and have attracted much attention. Fiber Fabry-Perot sensors are currently the longest-standing, most mature, and most widely used fiber optic sensors. It creates two high-reflection layers in the optical fiber to form a microcavity. When a coherent light beam is incident on the microcavity along the optical fiber, the two high-reflection layers reflect a part of the light and return along the original path and meet each other to produce interference. The interference signal is related to the length of the microcavity. When a certain pressure is applied to the microcavity, the cavity length changes and the interference output signal also changes. Therefore, the cavity length demodulation of the interference output signal can be performed to realize the sensing of various external parameters.

[0003] In recent years, various fiber Fabry-Perot sensors with high sensitivity and resolution that can meet the requirements of intracranial pressure measurement have been proposed. They have the following characteristics: (1) biocompatibility; (2) small size; (3) sufficiently high sensitivity, resolution and dynamic range; (4) a demodulation system capable of monitoring small pressure changes. Under the action of intracranial pressure, the change range of the microcavity length in the fiber Fabry-Perot (FP) sensor corresponds to the change of intracranial pressure. Due to the characteristics of intracranial pressure changes, the microcavity length of the fiber Fabry-Perot sensor needs to be controlled at the order of tens of microns to achieve linear sensing of intracranial pressure. The difficulty and cost of the manufacturing process for accurately controlling the cavity length can be imagined. Therefore, the cavity length demodulation method that does not require high accuracy of the initial cavity length is an effective way to reduce the difficulty and cost of processing, which is of great significance to the widespread application of fiber FP sensors in the field of intracranial pressure measurement.

[0004] There are two main types of signal demodulation for fiber FP sensors: intensity demodulation and phase demodulation. The intensity demodulation method is simple but the result has a large error. The phase demodulation method is accurate but relatively precise, and has become a more common method at present. Commonly used phase demodulation methods include fringe counting method, Fourier transform method, and correlation method. Among them, the fringe counting method and the Fourier transform method rely on demodulation hardware, such as a high-precision spectrometer or a scanning light source, but the spectrometer is bulky, expensive, slow to acquire data, and the supporting demodulation algorithm is quite complex and time-consuming. Therefore, this method is not suitable for actual engineering, and is even less suitable for intracranial pressure detection with high requirements for real-time detection. Relatively speaking, the correlation method is more suitable for actual engineering applications because it implements correlation operations based on optical elements.

[0005] For example, the Fizeau interferometer demodulation method in the correlation method has good long-term reliability, relatively simple hardware, and a relatively intuitive demodulation algorithm. This demodulation method is very suitable for demodulating fiber FP sensors whose initial cavity length cannot be precisely controlled. However, this demodulation method requires a high-precision optical wedge with a very small inclination angle to construct an interference signal that matches the microcavity length in the fiber sensor to realize the correlation operation. According to the indicators of the existing photodetector linear array, its wedge angle must be around 0.1° to achieve a processing accuracy of the second level, and its optical components such as collimating lenses and cylindrical mirrors, and the assembly accuracy of the photodetector array are also extremely high. Therefore, the overall price of this type of demodulator is still high and has not been widely used in the medical industry.

[0006] In summary, how to obtain the assembly accuracy of optical devices and the processing accuracy of optical wedges in the Fizeau interferometer demodulation system are the two major difficulties that limit the use of fiber optic FP sensors for optical intracranial pressure detection. The medical field has requirements for demodulation accuracy, demodulation speed, cost and size, and the existing technical solutions cannot meet the above requirements in a balanced manner. Therefore, when demodulating the fiber optic FP sensor whose initial cavity length cannot be accurately controlled based on the Fizeau interferometer, there is an urgent need for an assembly method and an optical intracranial pressure monitoring device that can more economically meet the application of engineering mass production. Summary of the invention

[0007] In order to solve the problem that the optical fiber FP sensor proposed in the above background technology that cannot accurately control the initial cavity length when demodulating the Fizeau interferometer is widely used in the medical industry, the present invention provides the following technical solutions:

[0008] A method for assembling and adjusting an optical intracranial pressure monitoring device, the intracranial pressure monitoring device comprising a Fizeau interferometer module and a CCD data acquisition and processing module; the Fizeau interferometer module comprising an optical fiber port assembly, an optical base plate, an interface side wall, a beam shaping assembly, and an optical wedge assembly; the interface side wall is fixedly connected to the optical base plate, the interface side wall is provided with a through hole, the optical fiber port assembly is fixedly connected to the interface side wall, and the optical path outlet of the optical fiber port assembly is connected to the through hole; the assembling and adjusting method comprises the following steps:

[0009] S1, connecting a detection light source to the optical path entrance of the optical fiber port assembly, and transmitting the optical signal generated by the detection light source to be emitted from the optical path exit; adjusting the optical fiber port assembly so that the light spot of the output light at the optical path exit meets the first preset requirement;

[0010] S2, pre-placing the optical wedge component so that the interference fringes generated by the outgoing light passing through the optical wedge component meet a second preset requirement;

[0011] S3, matching the optical wedge component and the beam shaping component so that the interference fringes generated by the outgoing light passing through the optical wedge component meet a third preset requirement;

[0012] S4, adjusting the CCD data acquisition and processing module until the CCD data acquisition and processing module receives the relevant interference signal;

[0013] After the adjustment according to steps S1 to S4 is completed, the beam shaping assembly and the optical wedge assembly are fixedly connected to the optical base plate, and the emergent light passes through the beam shaping assembly and the optical wedge assembly in sequence to reach the CCD data acquisition and processing module.

[0014] Preferably, the first preset requirement in step S1 includes whether the size of the light spot meets a predetermined size, whether the optical axis of the emitted light coincides with a reference optical axis, and the reference optical axis takes the center of the optical path exit as a starting point and is parallel to the optical base plate;

[0015] The adjusting of the optical fiber port assembly includes adjusting the distance between the optical axis of the outgoing light and the optical base plate, and adjusting the optical axis of the outgoing light to coincide with the reference optical axis.

[0016] Preferably, the optical fiber port assembly is divided into two types: a first port assembly and a second port assembly;

[0017] The first port assembly includes a boss adapter block, an incident optical fiber ferrule, and a collimating lens. The boss adapter block is provided with a through hole, the boss adapter block is fixedly connected to the side wall of the interface, and the through hole is connected to the through hole; the incident optical fiber ferrule, the collimating lens and the through hole are radially connected, the light beam transmitted by the incident optical fiber ferrule passes through the collimating lens and leaves the optical fiber port assembly, and the end face of the incident optical fiber ferrule and the collimating lens are spaced a first distance apart;

[0018] The second port assembly includes a boss adapter block and an incident optical fiber ferrule, the boss adapter block is provided with a through hole, the boss adapter block is fixedly connected to the interface side wall, and the through hole is connected to the through hole; the incident optical fiber ferrule is radially connected to the through hole, and the end face of the incident optical fiber ferrule and the end face of the through hole away from the through hole are spaced a second distance;

[0019] The adjusting the optical fiber port assembly includes replacing a first port assembly having a different first distance or replacing a second port assembly having a different second distance.

[0020] Preferably, the second preset requirement in step S2 includes:

[0021] When the beam shaping assembly is not yet installed in the optical base plate, whether the outgoing light forms interference fringes through the optical wedge assembly, wherein the interference fringes include reflection interference fringes and transmission interference fringes;

[0022] The third preset requirement in step S3 includes:

[0023] When both the optical wedge component and the beam shaping component are moved into the optical path, whether the outgoing light forms interference fringes when passing through the optical wedge component;

[0024] and whether the center of the linear light spot reflected back in the direction of the light path exit coincides with the center of the light path exit when both the optical wedge assembly and the beam shaping assembly are moved into the light path;

[0025] The matching of the optical wedge assembly and the beam shaping assembly includes: moving the optical wedge assembly and the beam shaping assembly back and forth along the optical axis of the emergent light, and / or moving the optical wedge assembly and the beam shaping assembly back and forth along a first direction, wherein the first direction is perpendicular to the optical axis of the emergent light and parallel to the mounting surface of the optical base plate.

[0026] Preferably, the intracranial pressure monitoring device further comprises a light source module, an FP optical fiber sensor and an optical fiber coupler, wherein the optical fiber coupler is respectively connected to the light source module, the FP optical fiber sensor and the Fizeau interference module via optical fibers; the optical signal generated by the light source module is coupled into the optical fiber coupler via optical fibers and is divided into a first light beam and a second light beam, the first light beam is transmitted to the FP optical fiber sensor and generates a first interference signal, the first interference signal is transmitted back to the optical fiber coupler and transmitted to the Fizeau interference module, the second light beam is transmitted to the Fizeau interference module and generates a second interference signal via the optical wedge assembly, the coherent light beams generated by the first interference signal and the second interference signal are transmitted to the CCD data acquisition and processing module and converted into electrical signals, the electrical signals are processed by an algorithm to demodulate the cavity length and the corresponding pressure value of the FP optical fiber sensor; the adjustment method further comprises the following steps:

[0027] S5, remove the detection light source, connect the fiber coupler to the optical path entrance of the fiber port assembly, connect the light source module, the FP fiber sensor and the fiber coupler through optical fibers, and the light signal generated by the light source module enables the CCD data acquisition and processing module to receive the relevant interference signal;

[0028] S6. Adjust the brightness of the light source module so that the relevant interference signal received by the CCD data acquisition and processing module is demodulated to obtain a preset intracranial pressure value detected by the FP optical fiber sensor after signal processing, and the adjustment is completed.

[0029] An optical intracranial pressure monitoring device comprises a light source module, an FP optical fiber sensor and an optical fiber coupler, a Fizeau interferometer module, and a CCD data acquisition and processing module, wherein the optical fiber coupler is connected to the light source module, the FP optical fiber sensor, and the Fizeau interferometer module respectively through optical fibers;

[0030] The Fizeau interferometer module includes an optical fiber port assembly, an optical base plate, an interface side wall, a beam shaping assembly, and an optical wedge assembly. The interface side wall is fixedly connected to the optical base plate, the interface side wall is provided with a through hole, the optical fiber port assembly is fixedly connected to the interface side wall, and the optical path outlet of the optical fiber port assembly is connected to the through hole; the beam shaping assembly and the optical wedge assembly are both fixedly connected to the optical base plate, and the emergent light passes through the beam shaping assembly and the optical wedge assembly in sequence to reach the CCD data acquisition and processing module;

[0031] The optical intracranial pressure monitoring device is assembled and adjusted by the assembly and adjustment method according to claim 5;

[0032] The optical signal generated by the light source module is coupled into the optical fiber coupler via an optical fiber and is divided into a first light beam and a second light beam. The first light beam is transmitted to the FP optical fiber sensor and generates a first interference signal. The first interference signal is transmitted back to the optical fiber coupler and transmitted to the Fizeau interference module. The second light beam is transmitted to the Fizeau interference module and generates a second interference signal through the optical wedge component. The coherent light beam generated by the first interference signal and the second interference signal is transmitted to the CCD data acquisition and processing module and converted into an electrical signal. The electrical signal is demodulated through algorithm processing to obtain the cavity length and the corresponding pressure value of the FP optical fiber sensor.

[0033] Preferably, the optical wedge assembly is arranged on the optical path, and the optical wedge assembly includes an optical wedge, a first spacer, and a positioning block; the optical wedge includes two sheets of flat glass and a second spacer, one end of the two sheets of flat glass is abutted, and the other end is separated by the second spacer; the inclined surface of the optical wedge is tightly attached to the first spacer at the end where the second spacer is not provided to form an optical wedge pre-assembled part, and the optical wedge pre-assembled part is installed in the positioning block, and the positioning block is connected to the base. Its beneficial effect is that the wedge angle and wedge thickness of the optical wedge are controlled by the precision of the second spacer, and then the thickness of the end where the second spacer is not installed is adjusted by the first spacer, the first spacer used can be the same as the second spacer and installed in a symmetrical position, and the combination of the optical wedge and the first spacer is equivalent to a rectangular parallelepiped as a whole, which is convenient for installation in the square hole of the positioning block, so that the plane of the optical wedge in the optical wedge assembly is perpendicular to the optical axis of the optical path passing through it, meeting the assembly accuracy requirements.

[0034] Preferably, the CCD data acquisition and processing module includes a CCD sensor, a CCD driver board and a host computer software. The CCD sensor is connected to the plane of the optical wedge in a fitted manner. The CCD driver board is installed on the base. The host computer software performs a signal processing algorithm on the electrical signal transmitted by the CCD sensor to demodulate the cavity length and corresponding pressure value of the FP optical fiber sensor.

[0035] Preferably, the base includes a first side wall and a second side wall, the through hole is provided on the first side wall, the second side wall is perpendicular to the first side wall, and the light source module is provided on a side of the second side wall away from the light path; the beneficial effect is that by installing the light source on the second side wall of the base, the structure is simple, the light path is concise, and the light loss is small.

[0036] Preferably, the light source module comprises an LED light source assembly, the LED light source assembly comprises an LED lamp, an LED light source mounting block, and an optical fiber connector, the LED light source mounting block is provided with a first straight through hole, the optical fiber connector and the LED lamp are arranged in the first straight through hole to form an optical path;

[0037] Or, the light source module includes a halogen lamp assembly, the halogen lamp assembly includes a halogen lamp, a halogen lens, a halogen light source mounting block, and an optical fiber connector. The halogen light source mounting block is provided with a second through hole, and the optical fiber connector, the halogen lens, and the halogen light source are sequentially arranged in the second through hole to form an optical path.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: the installation and adjustment method of the present invention reduces the accuracy requirements of key components including the FP optical fiber sensor and the optical wedge assembly, and through the installation and adjustment steps, the optical intracranial pressure monitoring device based on the Fizeau interferometer can be engineered and mass-produced, and the accuracy requirements for the initial cavity length of the FP sensor are reduced through overall coordination; at the same time, the accuracy adjustment of the optical wedge is achieved through the spacer, so that the engineering requirements of the medical industry can be met economically and in batches; by selecting different optical fiber port assemblies, and then by matching the optical wedge assembly, the beam shaping assembly, the CCD data acquisition and processing module and the optical fiber port assembly, the system-level accuracy adjustment is achieved to meet the accuracy requirements of demodulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 FIG. 4 is a flow chart of an optical system assembly method according to an embodiment of the present invention.

[0041] Figure 2 Schematic diagram of a top view of an optical intracranial pressure monitoring device in one embodiment of the present invention.

[0042] Figure 3 for Figure 2 Schematic diagram of BB direction in .

[0043] Figure 4 for Figure 2 Schematic diagram of the FP sensor with enlargement at center left.

[0044] Figure 5 for Figure 3 Schematic diagram of the CC direction.

[0045] Figure 6 for Figure 2 Schematic diagram of AA direction in .

[0046] Figure 7 Schematic diagram of a top view of an optical sensor device in one embodiment of the present invention - the light source includes a halogen lamp assembly.

[0047] Figure 8 for Figure 7 Schematic diagram of DD direction in .

[0048] Figure 9a A top view of a tool used to make an optical wedge in one embodiment of the present invention.

[0049] Figure 9b for Figure 9a Schematic diagram of EE direction in .

[0050] Fig.10 A three-dimensional view of a tool used to make an optical wedge in one embodiment of the present invention.

[0051] Fig.11 FIG. 4 is a cross-sectional view of a Fizeau interferometer module including an optical fiber ceramic ferrule according to an embodiment of the present invention.

[0052] Fig.12 A partial cross-sectional view of a Fizeau interferometer module including a fiber optic adapter according to an embodiment of the present invention.

[0053] Fig.13 A partial cross-sectional view of a Fizeau interferometer module excluding a fiber adapter according to an embodiment of the present invention.

[0054] Fig.14 Schematic diagram of a CCD sensor installed in a Fizeau interferometer module in one embodiment of the present invention.

[0055] Fig.15 Interference fringes obtained in step S2 of the adjustment method in one embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] In the present invention, the optical fiber FP sensor, the FP sensor, the optical fiber Fabry-Perot sensor and the Fabry-Perot sensor are synonymous.

[0058] like Figure 1 and Fig.14As shown, an installation method of an optical intracranial pressure monitoring device, the intracranial pressure monitoring device includes a Fizeau interferometer module and a CCD data acquisition and processing module 600; the Fizeau interferometer module includes an optical fiber port assembly 300, an optical base plate 100, an interface side wall 200, a beam shaping assembly 400, and an optical wedge assembly 500; the interface side wall 200 is fixedly connected to the optical base plate 100, the interface side wall is provided with a through hole, the optical fiber port assembly 300 is fixedly connected to the interface side wall 200, and the optical path outlet of the optical fiber port assembly 300 is connected to the through hole; the installation method includes the following steps:

[0059] S1, connecting the detection light source to the optical path entrance of the optical fiber port assembly 300, and transmitting the optical signal generated by the detection light source from the optical path exit; adjusting the optical fiber port assembly 300 so that the light spot of the output light at the optical path exit meets the first preset requirement;

[0060] S2, pre-place the optical wedge assembly 500 so that the interference fringes generated by the outgoing light passing through the optical wedge assembly 500 meet the second preset requirement;

[0061] S3, matching the optical wedge assembly 500 and the beam shaping assembly 400 so that the interference fringes generated by the outgoing light passing through the optical wedge assembly 500 meet the third preset requirement;

[0062] S4, adjusting the CCD data acquisition and processing module 600 until the CCD data acquisition and processing module 600 receives the relevant interference signal;

[0063] After the adjustment according to steps S1 to S4 is completed, the beam shaping assembly 400 and the optical wedge assembly 500 are fixedly connected to the optical base plate 100 , and the outgoing light passes through the beam shaping assembly 400 and the optical wedge assembly 500 in sequence to reach the CCD data acquisition and processing module 600 .

[0064] In some embodiments, the first preset requirement in step S1 includes whether the size of the light spot meets the predetermined size, whether the optical axis of the emitted light coincides with the reference optical axis, such as Figure 3 As shown, the reference optical axis starts from the center of the optical path exit and is parallel to the optical base plate 100;

[0065] Adjusting the optical fiber port assembly includes adjusting the distance between the optical axis of the outgoing light and the optical base plate 100, and adjusting the optical axis of the outgoing light to coincide with the reference optical axis. In a specific embodiment, the optical fiber port assembly and the interface side wall are connected by threads, and the optical fiber port assembly and the interface side wall are both provided with four matching screw holes, and the screw holes are aligned and connected by screws; an elastic element is also provided between the optical fiber port assembly and the interface side wall, and by adjusting the degree to which the screw is screwed into the screw hole, the deformation amount of the elastic element being compressed changes, thereby achieving the adjustment of the pitch angle, that is, the adjustment of the optical axis of the outgoing light.

[0066] In some embodiments, the optical fiber port assembly is divided into two types: a first port assembly and a second port assembly;

[0067] The first port assembly includes a boss adapter block, an incident optical fiber ferrule, and a collimating lens. The boss adapter block is provided with a through hole, which is fixedly connected to the side wall of the interface and enables the through hole to communicate with the through hole. The incident optical fiber ferrule, the collimating lens, and the through hole are radially connected. The light beam transmitted by the incident optical fiber ferrule leaves the optical fiber port assembly after passing through the collimating lens. The end face of the incident optical fiber ferrule and the collimating lens are spaced a first distance apart.

[0068] In some embodiments, Fig.12 As shown, the first port assembly includes a boss adapter block 33, a fiber optic connector 11, a fiber optic adapter 10, a collimating lens 24, and a pressing ring 27. The boss adapter block 33 is provided with a through hole, and the boss adapter block is fixedly connected to the through hole so that the through hole is connected to the through hole of the base 5; the collimating lens 24 is radially connected to the through hole, and the pressing ring 27 is arranged on the side of the through hole close to the optical wedge assembly to press the collimating lens 24, the fiber optic adapter 10 is radially connected to the through hole, and the fiber optic adapter 10, the collimating lens 24, and the pressing ring 27 are sequentially arranged along the axial direction of the optical path; the fiber optic connector 11 is connected to the fiber optic adapter 10. In some embodiments, the collimating lens 24 is a halogen lens.

[0069] In some other embodiments, such as Fig.13 As shown, the first port assembly includes a boss adapter block 34, an optical fiber connector 11, a collimating lens 24, and a pressure ring 27. The boss adapter block 34 is provided with a through hole, and the boss adapter block 34 is fixedly connected to the through hole so that the through holes are connected to each other; the collimating lens 24 is radially connected to the through hole, and the pressure ring 27 is arranged on the side of the through hole close to the optical wedge assembly to press the collimating lens 24, and the optical fiber connector 11 is radially connected to the through hole. The optical fiber connector 11, the collimating lens 24, and the pressure ring 27 are sequentially arranged along the axial direction of the optical path. The collimating lens 24 adopts a halogen lens.

[0070] The second port assembly includes a boss adapter block and an incident optical fiber ferrule. The boss adapter block is provided with a through hole. The boss adapter block is fixedly connected to the side wall of the interface, and the through hole is connected to the through hole. The incident optical fiber ferrule is radially connected to the through hole, and the end face of the incident optical fiber ferrule and the end face of the through hole away from the through hole are spaced a second distance apart.

[0071] It should be noted that in some other embodiments, the boss adapter block may not be used. Figure 2 and Figure 3As shown, the optical fiber interface assembly includes an optical fiber adapter 10 and an optical fiber connector 11. The end of the optical fiber is connected with the optical fiber connector 11, and the optical fiber connector 11 is connected to the optical fiber adapter 10. The optical fiber adapter 10 is fixedly connected to the base 5, so that the optical fiber connector 11 is connected to the through hole;

[0072] In some other embodiments, such as Fig.11 As shown, the optical fiber interface component is an optical fiber ceramic ferrule 18, one end of which is used to connect the optical fiber that transmits the incident interference light, and the other end is fixedly connected to the through hole of the base 5 in the radial direction, so that the ceramic ferrule 18 and the through hole are connected.

[0073] Adjusting the optical fiber port assembly includes replacing the first port assembly with a different first distance or replacing the second port assembly with a different second distance, and also includes replacing the optical fiber port assembly with a different distance between the optical axis of the outgoing light and the optical base plate 100 .

[0074] In some embodiments, the second preset requirement in step S2 includes:

[0075] When the beam shaping assembly is not yet installed in the optical base plate, whether the outgoing light forms interference fringes through the optical wedge assembly, and the interference fringes include reflection interference fringes and transmission interference fringes;

[0076] The third preset requirement in step S3 includes:

[0077] When both the optical wedge component and the beam shaping component are moved into the optical path, whether the outgoing light forms interference fringes when passing through the optical wedge component;

[0078] and whether the center of the linear light spot reflected back in the direction of the light path exit coincides with the center of the light path exit when both the optical wedge component and the beam shaping component are moved into the light path;

[0079] like Fig.14 As shown, matching the optical wedge assembly 500 and the beam shaping assembly 400 includes: moving the optical wedge assembly 500 and the beam shaping assembly 400 back and forth along the optical axis of the outgoing light, and / or moving back and forth along a first direction, the first direction is perpendicular to the optical axis of the outgoing light and parallel to the mounting surface of the optical base plate, and also includes fine-tuning the pitch angle of the optical wedge assembly 500 and the beam shaping assembly 400 relative to the reference optical axis.

[0080] In some embodiments, Figure 2-Figure 5 As shown, the intracranial pressure monitoring device also includes a light source module, an FP optical fiber sensor and an optical fiber coupler, and the optical fiber coupler is connected to the light source module, the FP optical fiber sensor and the Fizeau interferometer module respectively through optical fibers; the beam shaping component includes a cylindrical mirror mounting seat 1 and a cylindrical mirror 2, and the optical wedge component includes a positioning block 8 and an optical wedge. Specifically, Figure 2As shown, the base 5 is placed on any plane, and the optical fiber port assembly includes an optical fiber adapter 10, which is screwed into the through hole on the side of the base 5 through its own external thread, and the optical fiber connector 11 with the main optical fiber 12 welded at the tail is screwed into the external thread of the optical fiber adapter 10 through its own internal thread to the limit position. The light source mounting block 14 and the CCD driving board 4 are respectively mounted on different sides of the base 5 by screws, and the cylindrical mirror mounting seat 1 and the positioning block 8 are respectively mounted on the bottom of the countersunk hole of the base 5 by screws.

[0081] like Figure 1 As shown, the main optical fiber 12 is coupled with the auxiliary optical fiber 21 connected to the light source at the intersection, the auxiliary optical fiber 21 is connected to the light source module through the ceramic ferrule 18, and the pressure sensing film 13 is attached to the end face of the main optical fiber 12 by glue, as shown in FIG. Figure 4 As shown, a countersunk hole is processed on the end face of the optical fiber to form a closed chamber with the pressure sensing film 13, that is, a Fabry-Perot sensor.

[0082] The optical signal generated by the light source module is coupled into the optical fiber coupler through the optical fiber and is divided into a first light beam and a second light beam. The first light beam is transmitted to the FP optical fiber sensor and generates a first interference signal. The first interference signal is transmitted back to the optical fiber coupler and transmitted to the Fizeau interference module. The second light beam is transmitted to the Fizeau interference module and generates a second interference signal through the optical wedge component. The coherent light beams generated by the first interference signal and the second interference signal are transmitted to the CCD data acquisition and processing module and converted into electrical signals. The electrical signals are processed by the algorithm and demodulated to obtain the cavity length and the corresponding pressure value of the FP optical fiber sensor. The installation and adjustment method also includes the following steps:

[0083] S5, remove the detection light source, connect the fiber coupler to the optical path entrance of the fiber port assembly, connect the light source module, the FP fiber sensor and the fiber coupler through the optical fiber, and the light signal generated by the light source module makes the CCD data acquisition and processing module receive the relevant interference signal;

[0084] S6. Adjust the brightness of the light source module so that the relevant interference signal received by the CCD data acquisition and processing module is demodulated to obtain the preset intracranial pressure value detected by the FP optical fiber sensor after signal processing, and the adjustment is completed.

[0085] Now, taking the detection light source as a laser in the visible light band as an example, a semiconductor laser or a solid laser or a gas laser in the bands of 660nm\632.8nm\532nm etc. can be used. This embodiment uses a 660nm solid laser to illustrate the assembly and adjustment process of the optical system in the optical intracranial pressure monitoring device:

[0086] S1, such as Figure 3 and Fig.14As shown, the solid laser is connected to the Fizeau interferometer module from the optical fiber port component 300; the laser is turned on, and by selecting different adjustment methods for the optical fiber port component 300 or adjusting the pitch angle of the optical fiber port component 300, a light screen with a scale is used to check whether the size of the light spot meets the requirements and whether the optical axis of the output light coincides with the reference optical axis along the reference optical axis at different distances from the optical fiber port component 300, and if the requirements are met, glue is applied for fixing;

[0087] S2, such as Fig.14 As shown, the optical wedge assembly 500 is pre-placed so that the interference fringes generated by the outgoing light passing through the optical wedge assembly 500 meet the second preset requirement; Fig.15 As shown, the second preset requirement is: when the beam shaping component has not been installed in the optical base plate, whether the outgoing light forms interference fringes through the optical wedge component, and the interference fringes include reflection interference fringes and transmission interference fringes; if there are interference fringes, it proves that the optical wedge can generate equal-inclination interference; select the optical wedge to enter step S3;

[0088] S3, such as Figure 3 and 14 As shown, the optical wedge assembly 500 and the beam shaping assembly 400 are matched so that the interference fringes generated by the outgoing light passing through the optical wedge assembly 400 meet the third preset requirement;

[0089] That is: after the optical wedge assembly 500 and the beam shaping assembly 400 are moved into the optical path, observe whether reflection interference fringes and transmission interference fringes are formed; observe in real time whether the center of the reflection interference fringes generated by the optical wedge coincides with the center of the optical path exit of the optical fiber port assembly 300. If they coincide, it means that the optical wedge, the cylindrical lens 2 and the optical path of the optical fiber port assembly 300 are coaxial. After they are coaxial, glue is applied to fix the optical wedge assembly 500 and the beam shaping assembly 400;

[0090] S4, adjusting the CCD data acquisition and processing module until the CCD data acquisition and processing module receives the relevant interference signal;

[0091] S5. Remove the detection light source, such as Figure 2 As shown, the optical fiber coupler is connected to the optical path entrance of the optical fiber port assembly, the light source module, the FP optical fiber sensor and the optical fiber coupler are connected through optical fibers, and the optical signal generated by the light source module enables the CCD data acquisition and processing module to receive the relevant interference signal; the relevant interference signal is observed by the host computer program;

[0092] S6. Adjust the brightness of the light source module so that the CCD can clearly distinguish the relevant interference signal. The relevant interference signal received by the CCD data acquisition and processing module is demodulated to obtain the preset intracranial pressure value detected by the FP optical fiber sensor after signal processing. The installation and adjustment is completed.

[0093] An optical intracranial pressure monitoring device comprises a light source module, an FP optical fiber sensor and an optical fiber coupler, a Fizeau interferometer module, and a CCD data acquisition and processing module, wherein the optical fiber coupler is connected to the light source module, the FP optical fiber sensor, and the Fizeau interferometer module respectively through optical fibers;

[0094] like Fig.14 As shown, the Fizeau interferometer module includes an optical fiber port assembly 300, an optical base plate 100, an interface side wall 200, a beam shaping assembly 400, and an optical wedge assembly 500. The interface side wall 200 is fixedly connected to the optical base plate 100, and the interface side wall 200 is provided with a through hole. The optical fiber port assembly 300 is fixedly connected to the interface side wall 200, and the optical path outlet of the optical fiber port assembly 300 is connected to the through hole; the beam shaping assembly 400 and the optical wedge assembly 500 are both fixedly connected to the optical base plate 100, and the outgoing light passes through the beam shaping assembly 400 and the optical wedge assembly 500 in sequence to reach the CCD data acquisition and processing module 600;

[0095] The optical intracranial pressure monitoring device is assembled and adjusted according to the above-mentioned assembly and adjustment method;

[0096] The optical signal generated by the light source module is coupled into the optical fiber coupler via the optical fiber and is divided into a first light beam and a second light beam. The first light beam is transmitted to the FP optical fiber sensor and generates a first interference signal. The first interference signal is transmitted back to the optical fiber coupler and transmitted to the Fizeau interferometer module. The second light beam is transmitted to the Fizeau interferometer module and generates a second interference signal through the optical wedge component. The coherent light beams generated by the first interference signal and the second interference signal are transmitted to the CCD data acquisition and processing module and converted into electrical signals. The electrical signals are demodulated by algorithm processing to obtain the cavity length and corresponding pressure value of the FP optical fiber sensor.

[0097] In some embodiments, Figure 2 , Figure 3 , Figure 5 and Fig.14As shown, the optical wedge assembly is arranged on the optical path, and the optical wedge assembly includes an optical wedge, a first spacer 71, and a positioning block; the optical wedge includes two sheets of flat glass 6 and a second spacer 72, one end of the two sheets of flat glass 6 is abutted, and the other end is separated by the second spacer 72; the inclined surface of the optical wedge is tightly attached to the first spacer 71 at the end where the second spacer 72 is not provided to form an optical wedge pre-assembled part, and the optical wedge pre-assembled part is installed in the positioning block 8, and the positioning block 8 is connected to the base. Its beneficial effect is that the wedge angle and wedge thickness of the optical wedge are controlled by the precision of the second spacer 72, and then the thickness of the end where the second spacer 72 is not installed is adjusted by the first spacer 71, the first spacer 71 used can be the same as the second spacer 72 and installed symmetrically, and the combination of the optical wedge and the first spacer 71 is equivalent to a rectangular parallelepiped as a whole, which is convenient for installation in the square hole of the positioning block, so that the plane of the optical wedge in the optical wedge assembly is perpendicular to the optical axis of the optical path passing through it, meeting the assembly accuracy requirements.

[0098] When making the optical wedge, in some embodiments, Figure 9a , Figure 9b and Fig.10 As shown, the optical wedge making tool 28 is placed on any plane, the lower glass sheet 6 is first placed into the optical wedge making tool 28, and then the spacer 72 is assembled at the position shown in the figure. Fig.10 As shown, the limiting end surface of the optical wedge making tool 28 can also limit the position of the assembly spacer 72 along the length direction of the optical wedge making tool 28, and finally put the upper glass sheet 6 in and stick it tightly to the three sides. The two glass sheets 6 are fixed by glue at the hollow position, and then taken out after being fixed, and the excess assembly spacer on the outside of the glass sheet 6 is removed to complete the bonding of the glass sheets.

[0099] In some other embodiments, the spacer optical fiber 29 may be used to replace the spacer gasket 72, such as Figure 9a , Figure 9b and Fig.10 As shown, the optical wedge making tool 28 is placed on any plane, the lower glass sheet 6 is first placed into the optical wedge making tool 28, and then the assembly spacer optical fiber 29 is placed at the position shown in the figure, as shown in FIG. Figure 7 and 8 As shown, the limit groove of the optical wedge making tool 28 can limit the position of the assembly spacer optical fiber 29 along the length direction of the optical wedge making tool 28, and finally put the upper glass sheet 6 in and stick it tightly to three sides. The two glass sheets 6 are fixed by glue at the hollow position, and then taken out after being fixed, and the excess assembly spacer optical fiber 29 outside the glass sheet 6 is removed to complete the bonding of the glass sheets.

[0100] In some embodiments, Figure 2 and Figure 3As shown, the CCD data acquisition and processing module includes a CCD sensor 3, a CCD driver board 4 and a host computer software. The CCD sensor 3 is connected to the plane of the optical wedge by fitting, and the CCD driver board 4 is installed on the side wall of the base 5 opposite to the side wall where the optical fiber interface component is installed. The host computer software performs a signal processing algorithm on the electrical signal transmitted by the CCD sensor 3 to demodulate the cavity length and the corresponding pressure value of the FP optical fiber sensor.

[0101] In some embodiments, the base includes a first side wall and a second side wall, the through hole is provided on the first side wall, the second side wall is perpendicular to the first side wall, and the light source module is provided on a side of the second side wall away from the light path; the beneficial effect is that by installing the light source on the second side wall of the base, the structure is simple, the light path is concise, and the light loss is small.

[0102] In some embodiments, the light source includes an LED light source assembly, the LED light source assembly includes an LED lamp, an LED light source mounting block, and an optical fiber connector, the LED light source mounting block is provided with a first straight through hole, the optical fiber connector and the LED lamp are arranged in the first straight through hole and form a light path; Figure 6 As shown, the diode circuit board 16 is installed on the side of the LED light source mounting block 14 by screws, and the pins of the LED lamp 15 pass through the corresponding through holes of the diode circuit board 16 respectively, and are fixed by soldering on the right side of the diode circuit board 16. The ferrule mounting piece 17 with the LED optical fiber 21 welded at the tail is inserted into the through hole of the LED light source mounting block 14 to a certain depth and then fixed with glue. The ST sleeve 20 is sleeved on the outer cylindrical surface of the optical fiber ceramic ferrule 18 and is also fixed with glue and then inserted into the through hole of the ferrule mounting piece 17 to the limit position. The ferrule clamping nut 19 has a notch for inserting the LED optical fiber 21, and is sleeved on the external thread of the ferrule mounting piece 17 and screwed in to fix the optical fiber ceramic ferrule 18.

[0103] In some embodiments, the LED lamp used is, for example, a white light LED (wavelength 400-700nm). It should be noted that the LED lamp can use any broadband LED lamp with a wavelength between 400-1000nm, such as in some other embodiments, an LED lamp with a wavelength of 785nm±28nm, or an LED lamp with a wavelength of 850nm±28nm.

[0104] Or, the light source includes a halogen lamp assembly, the halogen lamp assembly includes a halogen lamp, a halogen lens, a halogen light source mounting block, and an optical fiber connector. The halogen light source mounting block is provided with a second through hole, and the optical fiber connector, the halogen lens, and the halogen light source are sequentially arranged in the second through hole to form an optical path.

[0105] like Figure 7-8 As shown, the light source is mounted on the second side wall of the base 5 through the connecting member 22 by screws, and the halogen light source mounting block 26 is also mounted on the other side of the connecting member 22 by screws.

[0106] like Figure 7 As shown, the halogen lamp 25 is installed on the side of the halogen light source mounting block 26 by screws. The ferrule mounting member 17 with the halogen optical fiber 23 welded at the tail is inserted into the through hole of the halogen light source mounting block 26 to a certain depth and then fixed with glue. The optical fiber connector includes an optical fiber ceramic ferrule 18. The ST sleeve 20 is sleeved on the outer cylindrical surface of the optical fiber ceramic ferrule 18 and is also fixed with glue and then inserted into the through hole of the ferrule mounting member 17 to the limit position. The ferrule pressing nut 19 has a notch that can be inserted into the halogen optical fiber 23, and is screwed into the external thread of the ferrule mounting member 17 to fix the optical fiber ceramic ferrule 18. The halogen lens 24 is placed in the countersunk hole of the halogen light source mounting block 26 and fits with the end face. The halogen lens pressing ring 27 is screwed into the threaded hole of the halogen light source mounting block 26 and presses the halogen lens 24. The main optical fiber 12 and the halogen optical fiber 23 are coupled in the same way as the white light LED.

[0107] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, 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 method for assembling and adjusting an optical intracranial pressure monitoring device, characterized in that: The intracranial pressure monitoring device comprises a Fizeau interferometer module and a CCD data acquisition and processing module; the Fizeau interferometer module comprises an optical fiber port assembly, an optical base plate, an interface side wall, a beam shaping assembly, and an optical wedge assembly; the interface side wall is fixedly connected to the optical base plate, the interface side wall is provided with a through hole, the optical fiber port assembly is fixedly connected to the interface side wall, and the optical path outlet of the optical fiber port assembly is connected to the through hole; the assembly method comprises the following steps: S1, connecting a detection light source to the optical path entrance of the optical fiber port assembly, and transmitting the optical signal generated by the detection light source to be emitted from the optical path exit; adjusting the optical fiber port assembly so that the light spot of the output light at the optical path exit meets the first preset requirement; S2, pre-placing the optical wedge component so that the interference fringes generated by the outgoing light passing through the optical wedge component meet a second preset requirement; S3, matching the optical wedge component and the beam shaping component so that the interference fringes generated by the outgoing light passing through the optical wedge component meet a third preset requirement; S4, adjusting the CCD data acquisition and processing module until the CCD data acquisition and processing module receives the relevant interference signal; After the adjustment according to steps S1 to S4 is completed, the beam shaping assembly and the optical wedge assembly are fixedly connected to the optical base plate, and the emergent light passes through the beam shaping assembly and the optical wedge assembly in sequence to reach the CCD data acquisition and processing module.

2. The adjustment method according to claim 1, characterized in that: The first preset requirement in step S1 includes whether the size of the light spot meets the predetermined size, whether the optical axis of the emitted light coincides with the reference optical axis, and the reference optical axis takes the center of the optical path exit as the starting point and is parallel to the optical base plate; The adjusting of the optical fiber port assembly includes adjusting the distance between the optical axis of the outgoing light and the optical base plate, and adjusting the optical axis of the outgoing light to coincide with the reference optical axis.

3. The adjustment method according to claim 2, characterized in that: The optical fiber port assembly is divided into two types: a first port assembly and a second port assembly; The first port assembly includes a boss adapter block, an incident optical fiber ferrule, and a collimating lens. The boss adapter block is provided with a through hole, the boss adapter block is fixedly connected to the side wall of the interface, and the through hole is connected to the through hole; the incident optical fiber ferrule, the collimating lens and the through hole are radially connected, the light beam transmitted by the incident optical fiber ferrule passes through the collimating lens and leaves the optical fiber port assembly, and the end face of the incident optical fiber ferrule and the collimating lens are spaced a first distance apart; The second port assembly includes a boss adapter block and an incident optical fiber ferrule, the boss adapter block is provided with a through hole, the boss adapter block is fixedly connected to the interface side wall, and the through hole is connected to the through hole; the incident optical fiber ferrule is radially connected to the through hole, and the end face of the incident optical fiber ferrule and the end face of the through hole away from the through hole are spaced a second distance; The adjusting of the optical fiber port assembly includes replacing a first port assembly having a different first distance or replacing a second port assembly having a different second distance.

4. The adjustment method according to claim 1, characterized in that: The second preset requirement in step S2 includes: When the beam shaping assembly is not yet installed in the optical base plate, whether the outgoing light forms interference fringes through the optical wedge assembly, wherein the interference fringes include reflection interference fringes and transmission interference fringes; The third preset requirement in step S3 includes: When both the optical wedge component and the beam shaping component are moved into the optical path, whether the outgoing light forms interference fringes when passing through the optical wedge component; and whether the center of the linear light spot reflected back in the direction of the light path exit coincides with the center of the light path exit when both the optical wedge assembly and the beam shaping assembly are moved into the light path; The matching of the optical wedge assembly and the beam shaping assembly includes: moving the optical wedge assembly and the beam shaping assembly back and forth along the optical axis of the emergent light, and / or moving the optical wedge assembly and the beam shaping assembly back and forth along a first direction, wherein the first direction is perpendicular to the optical axis of the emergent light and parallel to the mounting surface of the optical base plate.

5. The adjustment method according to any one of claims 1 to 4, characterized in that: The intracranial pressure monitoring device also includes a light source module, an FP optical fiber sensor and an optical fiber coupler, wherein the optical fiber coupler is respectively connected to the light source module, the FP optical fiber sensor and the Fizeau interference module through optical fibers; the optical signal generated by the light source module is coupled into the optical fiber coupler through optical fibers and is divided into a first light beam and a second light beam, the first light beam is transmitted to the FP optical fiber sensor and generates a first interference signal, the first interference signal is transmitted back to the optical fiber coupler and transmitted to the Fizeau interference module, the second light beam is transmitted to the Fizeau interference module and generates a second interference signal through the optical wedge component, the coherent light beams generated by the first interference signal and the second interference signal are transmitted to the CCD data acquisition and processing module and converted into electrical signals, and the electrical signals are demodulated by algorithm processing to obtain the cavity length and corresponding pressure value of the FP optical fiber sensor; the adjustment method also includes the following steps: S5, remove the detection light source, connect the fiber coupler to the optical path entrance of the fiber port assembly, connect the light source module, the FP fiber sensor and the fiber coupler through optical fibers, and the light signal generated by the light source module enables the CCD data acquisition and processing module to receive the relevant interference signal; S6. Adjust the brightness of the light source module so that the relevant interference signal received by the CCD data acquisition and processing module is demodulated to obtain a preset intracranial pressure value detected by the FP optical fiber sensor after signal processing, and the adjustment is completed.

6. An optical intracranial pressure monitoring device, characterized in that: It includes a light source module, an FP optical fiber sensor and an optical fiber coupler, a Fizeau interferometer module, and a CCD data acquisition and processing module. The optical fiber coupler is connected to the light source module, the FP optical fiber sensor, and the Fizeau interferometer module through optical fibers. The Fizeau interferometer module includes an optical fiber port assembly, an optical base plate, an interface side wall, a beam shaping assembly, and an optical wedge assembly. The interface side wall is fixedly connected to the optical base plate, the interface side wall is provided with a through hole, the optical fiber port assembly is fixedly connected to the interface side wall, and the optical path outlet of the optical fiber port assembly is connected to the through hole; the beam shaping assembly and the optical wedge assembly are both fixedly connected to the optical base plate, and the emergent light passes through the beam shaping assembly and the optical wedge assembly in sequence to reach the CCD data acquisition and processing module; The optical intracranial pressure monitoring device is assembled and adjusted by the assembly and adjustment method according to claim 5; The optical signal generated by the light source module is coupled into the optical fiber coupler via an optical fiber and is divided into a first light beam and a second light beam. The first light beam is transmitted to the FP optical fiber sensor and generates a first interference signal. The first interference signal is transmitted back to the optical fiber coupler and transmitted to the Fizeau interference module. The second light beam is transmitted to the Fizeau interference module and generates a second interference signal through the optical wedge component. The coherent light beam generated by the first interference signal and the second interference signal is transmitted to the CCD data acquisition and processing module and converted into an electrical signal. The electrical signal is demodulated through algorithm processing to obtain the cavity length and the corresponding pressure value of the FP optical fiber sensor.

7. The optical intracranial pressure monitoring device according to claim 6, characterized in that: The optical wedge assembly is arranged on the optical path, and the optical wedge assembly includes an optical wedge, a first spacer, and a positioning block; the optical wedge includes two pieces of flat glass and a second spacer, one end of the two pieces of flat glass are abutted, and the other end is separated by the second spacer; the inclined surface of the optical wedge is tightly attached to the first spacer at the end where the second spacer is not provided to form an optical wedge pre-assembled part, and the optical wedge pre-assembled part is installed in the positioning block, and the positioning block is connected to the base.

8. The optical intracranial pressure monitoring device according to claim 7, characterized in that: The CCD data acquisition and processing module includes a CCD sensor, a CCD driving board and a host computer software. The CCD sensor is connected to the plane of the optical wedge by affixing, the CCD driving board is installed on the base, and the host computer software performs a signal processing algorithm on the electrical signal transmitted by the CCD sensor to demodulate the cavity length and the corresponding pressure value of the FP optical fiber sensor.

9. The optical intracranial pressure monitoring device according to claim 7, characterized in that: The base includes a first side wall and a second side wall. The through hole is arranged on the first side wall. The second side wall is perpendicular to the first side wall. The light source module is arranged on a side of the second side wall away from the light path.

10. The optical intracranial pressure monitoring device according to claim 10, characterized in that: The light source module includes an LED light source assembly, the LED light source assembly includes an LED lamp, an LED light source mounting block, and an optical fiber connector, the LED light source mounting block is provided with a first straight through hole, the optical fiber connector and the LED lamp are arranged in the first straight through hole to form an optical path; Or, the light source module includes a halogen lamp assembly, the halogen lamp assembly includes a halogen lamp, a halogen lens, a halogen light source mounting block, and an optical fiber connector. The halogen light source mounting block is provided with a second through hole, and the optical fiber connector, the halogen lens, and the halogen light source are sequentially arranged in the second through hole to form an optical path.

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