Optical fiber pressure sensor packaging structure and intrusive miniature blood pump

Abstract

The utility model relates to the technical field of medical instruments, and discloses an optical fiber pressure sensor packaging structure and an intrusive miniature blood pump, the optical fiber pressure sensor packaging structure comprises a first metal section, a wire winding section and a second metal section, the first metal section, the wire winding section and the second metal section are communicated with one another and are sequentially connected to form a continuous metal packaging structure, the first metal section is of a hollow tubular structure, a probe of an optical fiber pressure sensor is arranged in the first metal section, and the first metal section is provided with a pressure sensing window; the wire winding section is used for winding and wrapping the periphery of part of the optical fiber section of the optical fiber pressure sensor, and the second metal section is of a hollow tubular structure and is used for internally arranging part of the optical fiber section, so that the optical fiber section and a probe in the optical fiber pressure sensor can be effectively protected, and laser welding is easier to realize by utilizing the metal sections on the two sides of the metal packaging structure. The purpose that the optical fiber pressure sensor is integrated on the miniature blood pump is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, and further to an optical fiber pressure sensor packaging structure and an interventional micro blood pump. Background Art

[0002] In the treatment of various types of cardiogenic shock and end-stage heart failure patients, interventional micro blood pumps can assist in pumping blood to improve ventricular load, reduce cardiac operating pressure, and thus help the patient's heart recover, with good therapeutic effects. The micro blood pump needs to be transported through the femoral artery, through the aortic arch and across the valve to the ventricle. Its inflow chamber is placed in the ventricle and the outflow chamber is placed in the aorta to ensure that it can successfully draw blood from the ventricle and pump it into the aorta when it is working, improve the blood pressure difference between the aorta and the ventricle, and allow blood to flow fully throughout the body. The entire process requires that the working position of the micro blood pump must always be maintained in the correct position, and the judgment of its working position is particularly important.

[0003] At present, it is necessary to use optical fiber pressure sensors to provide real-time feedback of blood pressure information to the interventional ventricular assist device control system for logical judgment. If the characteristics of the blood pressure information are the changing characteristics of aortic pressure, the position is correct and no doctor's intervention is required. If the characteristics of the blood pressure information are the changing characteristics of ventricular pressure, the position is incorrect and the doctor will be prompted to perform timely operations and interventions.

[0004] However, the packaging structure of the existing optical fiber pressure sensor is difficult to integrate into a micro blood pump, which makes the detection of blood pressure information difficult. Therefore, it is necessary to improve the existing technology. Utility Model Content

[0005] In response to the above technical problems, the purpose of the utility model is to provide a fiber optic pressure sensor packaging structure and an invasive micro blood pump, which can solve the problem in the prior art that the packaging structure is difficult to integrate into the micro blood pump, making the use of the invasive micro blood pump safer and more reliable.

[0006] In order to achieve the above object, the present application provides a fiber optic pressure sensor packaging structure, comprising:

[0007] The first metal segment is a hollow tubular structure for a probe of a built-in optical fiber pressure sensor, and the first metal segment is provided with a pressure-sensing window, so that when a fluid flows through the pressure-sensing window, the optical fiber pressure sensor senses and collects the fluid pressure;

[0008] A wire winding section, used for winding and wrapping the outer circumference of a portion of the optical fiber pressure sensor's optical fiber section;

[0009] The second metal segment is a hollow tubular structure for housing part of the optical fiber segment;

[0010] The first metal segment, the wire winding segment and the second metal segment are interconnected and connected in sequence to form a continuous metal packaging structure.

[0011] In some embodiments, the pressure-sensing window is an opening formed on the peripheral wall of the first metal segment;

[0012] The pressure-sensing window is in communication with the interior of the first metal segment, so that in a working state, the fluid flows through the pressure-sensing window and contacts the sensing surface of the probe.

[0013] In some embodiments, the first metal segment is in a circular tube shape, the opening of the pressure-sensing window is oriented in a direction perpendicular to the axis of the first metal segment, and the inner diameter of the first metal segment is at least equal to the maximum outer diameter of the probe;

[0014] The projection of the opening outline of the pressure-sensing window on a vertical plane is rectangular, and the length of the pressure-sensing window is greater than or equal to one third of the overall length of the first metal segment.

[0015] In some embodiments, a process hole is further provided on the first metal segment. The process hole is located at one end of the first metal segment close to the wire winding segment and is used for dispensing glue and exhausting.

[0016] In some embodiments, the wire winding segment is in a threaded tubular structure, and the threaded tubular structure is formed by braiding wires in a threaded winding form along the outer circumference of the optical fiber segment;

[0017] The starting end of the wire winding segment is welded to the first metal segment, and the ending end of the wire winding segment is welded to the second metal segment.

[0018] In some embodiments, a protective layer is further provided between the wire winding segment and the corresponding optical fiber segment, and the protective layer is wrapped around the outer circumference of the corresponding optical fiber segment.

[0019] In some embodiments, the optical fiber pressure sensor packaging structure further includes: a packaging PI tube, a Haicui sleeve, an LC connector ferrule metal part, and an LC connector ferrule ceramic part connected in sequence;

[0020] The starting end of the packaged PI tube is sleeve-connected and fixed to one end of the second metal segment away from the wire winding segment.

[0021] Another aspect of the present application also provides an invasive micro blood pump, comprising:

[0022] Fiber optic pressure sensor;

[0023] The optical fiber pressure sensor packaging structure mentioned above, wherein the optical fiber pressure sensor is arranged inside the optical fiber pressure sensor packaging structure;

[0024] an outflow chamber connected to the first metal segment;

[0025] The micromotor comprises a tail cover, wherein the tail cover is connected to the second metal segment.

[0026] In some embodiments, a processing platform is provided on the surface of the outflow chamber, the surface height of the processing platform is higher than the surface height of the outflow chamber, a welding fixing groove is provided on the processing platform, the contour of the welding fixing groove is adapted to the outer contour of the first metal segment, so that the first metal segment can be embedded in the welding fixing groove and fixed by welding;

[0027] The pressure sensing window faces away from the welding fixing groove.

[0028] In some embodiments, the welding fixing groove is a semicircular groove, the first metal segment is a circular tubular structure, and the inner diameter of the semicircular groove matches the outer diameter of the first metal segment;

[0029] When the first metal segment is fixed to the welding fixing groove, a preset gap is provided between the end of the first metal segment and the bottom of the welding fixing groove, which is suitable for injection and filling of curing glue.

[0030] Compared with the prior art, the optical fiber pressure sensor packaging structure and the invasive micro blood pump provided by the utility model have the following beneficial effects:

[0031] 1. In the present application, the design of the first metal segment provides a housing space for the probe of the optical fiber pressure sensor to protect it while keeping the optical performance of the optical fiber pressure sensor undisturbed; and the two ends of the metal packaging structure are two metal segments, which makes it easier to achieve laser welding, thereby achieving precision welding through laser welding, thereby improving the manufacturing efficiency and quality of the entire packaging structure.

[0032] 2. In the present application, the pressure-sensitive window on the peripheral wall of the first metal segment is a channel for transmitting fluid pressure. The pressure-sensitive window is precisely aligned with the probe so that the fluid acts on the probe, thereby enabling the optical fiber pressure sensor to sense pressure changes. This design protects the optical fiber pressure sensor from direct impact and possible contamination of the fluid; and the light-transmitting component is very important for protecting the optical fiber pressure sensor from contamination and physical damage, thereby ensuring that the transmission of the optical signal is not hindered.

[0033] 3. In the present application, the circular tubular design and the inner diameter size selection of the first metal segment ensure that the probe of the optical fiber pressure sensor can be completely placed inside without being squeezed or deformed. Moreover, the opening direction design of the pressure-sensitive window allows the fluid to enter the metal segment from the side and directly apply pressure to the probe, rather than entering from the head of the first metal segment, so that the fluid pressure can be more accurately transmitted to the optical fiber pressure sensor.

[0034] 4. In the present application, a threaded tubular structure is used to increase the contact area with the optical fiber segment, providing better fixation and protection. At the same time, it is formed by wire winding, has good flexibility, and can be bent repeatedly in any direction, which helps to fit closely to the shape of the optical fiber segment and provide uniform protection. On the other hand, through welding connection, the fixation between the wire winding segment and the two metal segments is more stable, reducing relative movement or dislocation in a dynamic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0036] Figure 1 This is a schematic diagram of the overall structure of the optical fiber pressure sensor packaging structure in one embodiment of the present application;

[0037] Figure 2 is a partial cross-sectional view of a packaging structure equipped with an optical fiber pressure sensor in one embodiment of the present application;

[0038] Figure 3 is a schematic structural diagram of a first metal segment in one embodiment of the present application;

[0039] Figure 4 is a cross-sectional view of a first metal segment in one embodiment of the present application;

[0040] Figure 5 It is a partial structural schematic diagram of the optical fiber pressure sensor packaging structure when it is integrated into an invasive micro blood pump in one embodiment of the present application;

[0041] Figure 6 yes Figure 5 A local enlarged view of point A in FIG.

[0042] Figure 7 It is a schematic diagram of welding of the first metal segment and the outflow chamber in one embodiment of the present application.

[0043] Explanation of the accompanying drawings: first metal segment 1; pressure-sensing window 11; process hole 12; wire winding segment 2; second metal segment 3; packaged PI tube 4; Haicui sleeve 5; LC connector ferrule metal part 6; LC connector ferrule ceramic part 7; outflow chamber 81; welding fixing groove 810; tail cover 82; processing platform 83; optical fiber segment 91; Fabry-Perot cavity SiC substrate 92; Fabry-Perot cavity SiC pressure-sensing diaphragm 93; Fabry-Perot cavity cavity 94; optical fiber pressure sensor packaging structure 150. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0045] In order to simplify the drawings, only the parts related to the application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0046] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0047] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0050] Interventional micro blood pumps can assist in pumping blood to improve ventricular load, reduce cardiac working pressure, and thus help the patient's heart recover, with good therapeutic effects. Therefore, it is generally used as one of the important medical devices for high-risk PCI surgery, various types of cardiogenic shock and end-stage heart failure treatment, with the characteristics of low trauma, high effectiveness, greatly reduced surgical risks and fewer postoperative complications. During high-risk PCI surgery, it can provide sufficient hemodynamic support to the human body without causing physical damage to the heart, greatly reducing surgical risks and helping heart function to recover as soon as possible; in the treatment of various types of cardiogenic shock and end-stage heart failure patients, interventional micro blood pumps can assist in pumping blood to improve ventricular load, reduce cardiac working pressure, and thus help the patient's heart recover, with good therapeutic effects.

[0051] Generally, such surgeries and treatments require the equipment to work continuously. During operation, the micromotor and outflow chamber of the micro blood pump must be placed in the aorta, and the inflow chamber must be placed in the ventricle, with the cannula passing through the aortic valve. The position and location of the inflow chamber of the micro blood pump in the ventricle can be easily determined and controlled by the contact between the pigtail tube at the end of the inflow chamber and the ventricular wall. During operation, the systolic pressure increases rapidly when the heart beats, which will constantly suck the equipment into the ventricle. The inflow chamber will not move out of the ventricle to the outside of the valve, and the pigtail tube will be against the ventricular wall to form a support, so that the position of the inflow chamber can remain relatively stable in the ventricle throughout the process.

[0052] However, it is uncertain whether the micromotor and outflow chamber of the micro blood pump are accurately in the aorta, because the micromotor and outflow chamber may also be sucked into the ventricles when the heart contracts (at this time the micro blood pump will not be able to draw blood from the ventricles into the aorta). This requires the use of optical fiber pressure sensors to provide real-time feedback of blood pressure information to the interventional ventricular assist device control system for logical judgment. If the characteristics of the blood pressure information are the changing characteristics of the aortic pressure, the position is correct and no doctor's intervention is required. If the characteristics of the blood pressure information are the changing characteristics of the ventricular pressure, the position is incorrect and the doctor will be prompted to perform timely operations and interventions.

[0053] However, it is extremely challenging and difficult to safely and reliably integrate the fiber optic pressure sensor into the micromotor and outflow chamber 81 of the micro blood pump. The first problem is that the traditional monitoring method may not be able to accurately determine the position of the blood pump in the aorta, especially under the influence of the heart beat. Even the existing fiber optic pressure sensor packaging structure is not suitable for the special integration requirements of the micro blood pump.

[0054] To solve the above problems, please refer to the attached manual. Figure 1 The present application provides a fiber optic pressure sensor packaging structure, which can improve the safety, effectiveness and treatment success rate of an invasive micro blood pump.

[0055] Reference Manual Attached Figure 1 The present application provides a fiber optic pressure sensor packaging structure, including a first metal segment 1, a wire winding segment 2 and a second metal segment 3. Both metal segments are hollow tubular structures. The first metal segment 1 is used for a built-in Fabry-Perot cavity (probe) of the fiber optic pressure sensor, thereby providing a stable accommodation space for the Fabry-Perot cavity. The second metal segment 3 can be used for a fiber optic segment 91 in a built-in portion of the fiber optic pressure sensor.

[0056] Please refer to the attached Figure 2 The Fabry cavity in the above content includes a Fabry cavity SiC substrate 92, a Fabry cavity SiC pressure-sensitive diaphragm 93, and a Fabry cavity cavity 94. The substrate constitutes a solid foundation of the Fabry cavity and provides a platform for installing and fixing other Fabry cavity components; the diaphragm is located on the Fabry cavity SiC substrate 92 and constitutes a part of the Fabry cavity. The Fabry cavity SiC pressure-sensitive diaphragm 93 is designed to be sensitive to external pressure changes. When the fluid pressure acts on the diaphragm, it will cause its deformation, thereby changing the length of the Fabry cavity. The change in the length of the cavity will change the phase and intensity of the light wave, thereby affecting the spectral characteristics of the reflected or transmitted light, so that the Fabry cavity can convert the external pressure change into a detectable optical signal to achieve accurate measurement of the fluid pressure.

[0057] At the same time in this application, if Figure 3 and Figure 4The first metal segment 1 is provided with a pressure-sensitive window 11, which is used to provide a flow space for the fluid. It can also be understood as creating a channel for the flow of fluid (such as blood) on the first metal segment 1, so that the fluid can directly act on the Fabry-Perot cavity, so that the Fabry-Perot cavity can sense pressure changes, and enhance the response speed and measurement accuracy of the optical fiber pressure sensor. Traditionally, the optical fiber pressure sensor may adopt a simple tubular structure without a specially designed pressure-sensitive window 11, resulting in indirect or uncontrollable interaction between the fluid and the sensor. If it is its packaging structure, the optical fiber itself and the most important Fabry-Perot cavity of the pressure sensor are extremely vulnerable to damage during the integration into the micro blood pump, so the first metal segment 1 and the pressure-sensitive window 11 are used to provide physical protection for the Fabry-Perot cavity to prevent direct mechanical damage.

[0058] In addition, the wire winding segment 2 is used to wrap the outer circumference of the optical fiber segment 91 of the partial optical fiber pressure sensor. Moreover, the first metal segment 1, the wire winding segment 2 and the second metal segment 3 are interconnected and connected in sequence to form a continuous metal packaging structure.

[0059] It should be noted that this embodiment provides additional mechanical protection for the optical fiber by winding the wire segment 2 around the outside of the optical fiber segment 91, protecting the optical fiber from physical damage, which can effectively improve the durability of the optical fiber pressure sensor without affecting the transmission of the optical signal.

[0060] On the other hand, the existing packaging structure may not take into account the integration with the micro blood pump, resulting in insufficient fixation and protection of the optical fiber segment 91 inside the blood pump. Therefore, in this embodiment, by providing a continuous metal packaging structure, the packaging structure can be laser welded to the blood pump, which can meet the application requirements of the invasive micro blood pump in a complex medical environment as described above, while improving the mechanical strength and sealing performance of the overall packaging, and protecting the internal optical fiber pressure sensor.

[0061] In one embodiment, the wire winding segment 2 is a threaded tubular structure, which is formed by braiding the wire in the form of a threaded winding along the outer circumference of the optical fiber segment 91. This threaded winding method not only provides excellent mechanical protection for the optical fiber segment 91, but also enhances the overall stability and durability of the packaging structure.

[0062] Compared with the traditional smooth cylindrical or simple braided protection, the threaded tubular structure of the wire winding segment 2 provides necessary protection for the built-in optical fiber segment 91, while avoiding direct exposure to the tensile or shearing forces generated by the operation of the blood pump. The threaded structure of the wire winding segment 2 not only provides a mechanical protection, but also exhibits a certain elasticity and flexibility due to its braiding characteristics. These characteristics enable the wire winding segment 2 to remain stable in the complex environment inside the micro blood pump without being affected by adverse mechanical stress. In addition, the softness and elasticity of the wire winding segment 2 prevents it from causing damage when in contact with blood, meeting medical requirements.

[0063] It can be understood that during the manufacturing process, the wire winding segment 2 can be precisely manufactured by automated wire winding equipment to ensure the consistency and production efficiency of each sensor package. At the same time, the starting end of the wire winding segment 2 is welded to the first metal segment 1, and the terminal end of the wire winding segment 2 is welded to the second metal segment 3. The two ends of the wire winding segment 2 are connected to the first metal segment 1 and the second metal segment 3 by welding to form a continuous metal packaging structure, which further enhances the stability and sealing of the entire system.

[0064] Based on the above embodiment, in a further embodiment, the pressure-sensing window 11 is connected to the interior of the first metal segment 1 , and the fluid flows through the pressure-sensing window 11 and contacts the sensing surface of the probe.

[0065] In this embodiment, to ensure that the fluid can effectively transmit pressure to the optical fiber pressure sensor and achieve the best measurement accuracy, the fluid (such as blood) is in direct contact with the sensor probe. This design ensures that the sensor can accurately and in real time measure the fluid pressure while avoiding any potential errors introduced by indirect contact or pressure transmission medium.

[0066] The precise alignment of the pressure-sensing window 11 and the Fabry-Perot cavity also avoids unnecessary fluid interference and other factors that may cause measurement errors, allowing the fluid to act directly on the probe part of the optical fiber pressure sensor, i.e., the Fabry-Perot cavity, without hindrance, thereby enhancing the stability and reliability of the sensor.

[0067] On the basis of the above embodiment, the first metal segment 1 is in the shape of a circular tube, and the circular tube structure can evenly disperse the force in different directions, reduce local stress concentration, and thus protect the internal Fabry-Perot cavity. In addition, the inner diameter of the first metal segment 1 is at least equal to the maximum outer diameter of the Fabry-Perot cavity, so as to adapt to the Fabry-Perot cavity part of the built-in optical fiber pressure sensor, provide a stable protective environment for the Fabry-Perot cavity, and effectively isolate the external physical damage and biological contamination.

[0068] In addition, the opening of the pressure-sensing window 11 is oriented perpendicular to the axis of the first metal segment 1. When the fluid flows through the first metal segment 1, the vertical opening provides a direct and efficient path, allowing the fluid to quickly and accurately transmit pressure to the Fabry-Perot cavity, thereby reducing measurement errors. The vertical design of the opening also helps to enhance the stability of the entire packaging structure. The force generated by the fluid when acting on the Fabry-Perot cavity will not cause the packaging structure to deflect or rotate, thereby ensuring the long-term stability and reliability of the sensor.

[0069] Furthermore, this opening design is not easily damaged or blocked by sheaths, hemostatic valves, guidewires, skin tissue, vascular tissue, etc. during the subsequent process of building a pathway and access route for the interventional blood vessel, which helps to extend the service life of the sensor and enhance its durability. On the other hand, the vertical opening orientation facilitates the maintenance and cleaning of the packaging structure, because the fluid can be quickly discharged after the action, reducing the possibility of retention inside the packaging structure.

[0070] Optionally, the opening outline of the pressure-sensing window 11 is rectangular, that is, the projection on the vertical plane is rectangular. The pressure-sensing window 11 with a rectangular outline transmits pressure more evenly when fluid flows through, which is beneficial to improving measurement accuracy and response speed.

[0071] In another embodiment, the length of the pressure sensing window 11 is greater than or equal to one third of the overall length of the first metal segment 1, ensuring a sufficient fluid action area, so that when the fluid flows through the sensor, a more uniform and predictable pressure transfer effect can be produced, thereby improving the sensor's response speed and sensitivity to changes in fluid pressure and reducing the impact on measurement accuracy.

[0072] Based on the above, the rectangular outline and size design of the pressure-sensing window 11 take into account the mechanical stability of the packaging structure. The larger opening length helps to disperse the fluid force and reduce the local stress on the packaging structure, thereby reducing the risk of fatigue damage to the packaging structure during long-term operation. This is particularly important in similar medical devices such as invasive micro blood pumps, because these devices need to operate for a long time in the in vivo environment, and the stability and durability of their packaging structure are the key to ensuring the safe operation of the equipment.

[0073] In practical applications, this design of the pressure-sensing window 11 also provides better biocompatibility. Due to the increase in the fluid action area, the contact between the fluid and the packaging structure is more uniform, avoiding the formation of blood flow dead corners or blood flow disturbances in the body, and reducing the risk of thrombosis. This is a significant advantage for medical devices that need to be implanted in patients for a long time.

[0074] In one embodiment, Figure 3As shown, a process hole 12 is also provided on the first metal segment 1. The process hole 12 is located at one end of the first metal segment 1 close to the wire winding segment 2 to facilitate the assembly and packaging of the optical fiber and the Fabry-Perot cavity inside the first metal segment 1 and to be used for glue application and exhaust.

[0075] The process hole 12 allows technicians to easily adjust the position of the optical fiber and the Fabry-Perot cavity, ensuring their accurate alignment and fixation in the packaging structure, and reducing the influence of position deviation on the measurement accuracy. During operation, first, the optical fiber and the Fabry-Perot cavity are placed at a predetermined starting position in the first metal segment 1 by vision or by using a precise positioning tool (such as a microscope or a positioning fixture); then, the optical fiber and the Fabry-Perot cavity can be slightly adjusted through the process hole 12 and by using a slender adjustment tool such as tweezers or a special fixture to ensure their accurate alignment inside the first metal segment 1.

[0076] In addition, when injecting packaging glue or other fixing agents, the process hole 12 serves as an injection point, so that the glue can be evenly filled into the packaging structure, surrounding the optical fiber and the Fabry-Perot cavity, thereby ensuring the sealing of the packaging and the stability of the sensor. At the same time, the process hole 12 also serves as an exhaust channel, so that when the glue is injected into the packaging body, the internal air and volatile gas can be smoothly discharged, effectively avoiding the formation of bubbles.

[0077] After the packaging glue is injected and the gas is exhausted, the process hole 12 is sealed, and finally the packaging glue is cured to ensure the integrity and sealing of the packaging structure and prevent the penetration of body fluids and the contamination of microorganisms.

[0078] In one embodiment, the difference from the above embodiment is that a protective layer is further provided between the winding wire segment 2 and the corresponding optical fiber segment 91 , and the protective layer is wrapped around the outer circumference of the corresponding optical fiber segment 91 .

[0079] Optionally, the protective layer is formed by wrapping a polyimide tape around the outer periphery of the optical fiber segment 91 to prevent the optical fiber segment 91 from being damaged or broken. Of course, in other embodiments, protective layers made of other materials may also be used to protect the optical fiber segment 91, which will not be listed one by one here.

[0080] In the process of making the winding segment 2, a layer of polyimide tape (PI tape) is firstly tightly and evenly wound along the surface of the optical fiber segment 91, so as to provide additional protection for the optical fiber segment 91 in the subsequent braided wire spiral winding process, and reduce the risk of accidental damage and breakage of the optical fiber caused by the winding operation. The use of PI tape not only enhances the mechanical protection of the optical fiber segment 91, but also helps to protect the optical fiber from damage in the subsequent packaging due to its good thermal stability.

[0081] In addition, the chemical stability of PI tape also means that it has good compatibility in the body and will not negatively affect the performance of the sensor or the safety of the patient. On the other hand, PI tape helps protect the optical fiber from moisture, chemicals and biological contamination. The synergistic effect of the braided silk and PI tape provides a strong and flexible protective layer for the optical fiber segment 91, which effectively resists external mechanical stress and environmental influences.

[0082] In another embodiment, if Figure 1 As shown, the optical fiber pressure sensor packaging structure also includes: a packaging PI tube 4, a Haicui sleeve 5, an LC connector core metal part 6, and an LC connector core ceramic part 7 connected in sequence; wherein the starting end of the packaging PI tube 4 is sleeve-connected with the end of the second metal segment 3 away from the wire winding segment 2 and fixed to each other.

[0083] It should be noted that, by connecting and combining the packaged PI tube 4 and the above-mentioned metal packaging structure composed of the first metal segment 1, the wire winding segment 2, and the second metal segment 3, the packaging structure still has the characteristics of traditional non-metallic packaged optical fiber pressure sensors, such as light weight, small size, good flexibility, and arbitrary bending. At the same time, it is also perfectly combined with the metal packaging structure at the head end, making the optical fiber pressure sensor safer, more reliable and easy to integrate into the micro blood pump.

[0084] In addition, the Haicui sleeve 5 provides a second layer of protection for the packaging structure, and its excellent flexibility and wear resistance further ensure the safety of the optical fiber in a complex medical environment; on the other hand, by integrating the LC connector ferrule metal part 6 and the LC connector ferrule ceramic part 7 into the packaging structure, the precise docking and optical performance of the optical fiber connector are ensured. The LC connector ferrule metal part 6 provides the necessary mechanical strength, and through its internal optical fiber positioning mechanism, it ensures the precise alignment of the optical fiber during the connection process, and further enhances the electromagnetic compatibility of the sensor, reducing the impact of external electromagnetic interference on the sensor performance; the LC connector ferrule ceramic part 7 can protect the end of the optical fiber from damage, ensuring the stability of the optical fiber connection during long-term use.

[0085] In one embodiment, the reference specification Figure 5 and Figure 6 As shown, according to another aspect of the present application, the present application further provides an invasive micro blood pump, including the above-mentioned optical fiber pressure sensor packaging structure 150, and also including an optical fiber pressure sensor, which is arranged inside the optical fiber pressure sensor packaging structure 150.

[0086] At the same time, the micro blood pump also includes an outflow chamber 81 and a micro motor, which is a conventional setting in this field, so its internal structure will not be described in detail. It should be noted that the outflow chamber 81 is connected to the first metal segment 1 in the packaging structure, and the fluid (such as blood) flows out of the outflow chamber 81 smoothly, and at the same time, the pressure information is transmitted to the optical fiber pressure sensor to realize dynamic monitoring; the tail cover 82 of the micro motor is connected to the second metal segment 3 in the packaging structure, and the micro motor can provide the necessary power for the interventional micro blood pump, and the connection between the tail cover 82 and the second metal segment 3 ensures the sealing and durability of the entire system.

[0087] Furthermore, if Figure 7 As shown, the outflow chamber 81 is provided with a welding fixing groove 810, the contour of the welding fixing groove 810 is adapted to the outer contour of the first metal segment 1, so that the first metal segment 1 can be seamlessly embedded in the welding fixing groove 810 and welded and fixed, wherein the pressure sensing window 11 is oriented away from the welding fixing groove 810 to avoid damage to the pressure sensing window 11 during welding and fixing.

[0088] This embodiment ensures the alignment accuracy during the welding process, thereby improving the quality of the welded joint and the stability of the packaging structure. The accompanying drawings show that the semicircular welding fixing groove 810 is provided to match the tubular first metal segment 1 in the above-mentioned embodiment. Other shapes may also appear in other embodiments, and the modification or adjustment of this part should also be included in the protection scope of this application. Similarly, the connection between the second metal segment 3 and the tail cover 82 can also be a welding connection, which can ensure the firm connection between the second metal segment 3 and the tail cover 82 during long-term operation.

[0089] After welding is completed, fill the gap between the winding wire section 2 and the micromotor, and the gap between the first metal section 1 and the welding fixing groove 810 on the surface of the outflow chamber 81 with medical epoxy resin glue (see the attached manual). Figure 6 The B positions indicated in the figure, i.e. the preset gaps in the previous text), are filled with curing glue to achieve bonding and curing.

[0090] On the basis of the above embodiment, a processing platform 83 is provided on the surface of the outflow chamber 81; the surface height of the processing platform 83 is higher than the surface height of the outflow chamber 81, so that the welding fixing groove 810 can be provided on this processing platform 81. Since the outflow chamber 81 has a thin wall, it is inconvenient to directly perform deep groove processing on its surface, and the provision of the processing platform 83 allows the welding fixing groove 810 to have enough space to meet the needs of welding and fixing.

[0091] The above design provides a stable welding base for the first metal segment 1, making the welding process more convenient and reliable. Secondly, the processing platform 83 higher than the surface of the outflow chamber 81 provides the necessary space for the welding fixing groove 810 to accommodate the welding material and perform the welding operation. In addition, the design of the processing platform 83 also helps to protect the rest of the outflow chamber 81 from damage caused by heat and mechanical stress during the welding process.

[0092] Optionally, the interventional micro blood pump also includes a control system, which is electrically connected to the fiber optic pressure sensor and the micromotor, respectively. The control system automatically controls the start or shut down of the micromotor according to the blood pressure information obtained from the fiber optic pressure sensor to achieve precise control of blood pressure, thereby improving the safety of treatment and reducing harm to patients.

[0093] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. An optical fiber pressure sensor packaging structure, characterized in that: include: The first metal segment is a hollow tubular structure for a probe of a built-in optical fiber pressure sensor, and the first metal segment is provided with a pressure-sensing window, so that when a fluid flows through the pressure-sensing window, the optical fiber pressure sensor senses and collects the fluid pressure; A wire winding section, used for winding and wrapping the outer circumference of a portion of the optical fiber pressure sensor's optical fiber section; The second metal segment is a hollow tubular structure for housing part of the optical fiber segment; The first metal segment, the wire winding segment and the second metal segment are interconnected and connected in sequence to form a continuous metal packaging structure.

2. The optical fiber pressure sensor packaging structure according to claim 1, characterized in that: The pressure-sensing window is an opening formed on the peripheral wall of the first metal segment; The pressure-sensing window is in communication with the interior of the first metal segment, so that in a working state, the fluid flows through the pressure-sensing window and contacts the sensing surface of the probe.

3. The optical fiber pressure sensor packaging structure according to claim 2, characterized in that: The first metal segment is in a circular tube shape, the opening of the pressure-sensing window is oriented in a direction perpendicular to the axis of the first metal segment, and the inner diameter of the first metal segment is at least equal to the maximum outer diameter of the probe; The projection of the opening outline of the pressure-sensing window on a vertical plane is rectangular, and the length of the pressure-sensing window is greater than or equal to one third of the overall length of the first metal segment.

4. The optical fiber pressure sensor packaging structure according to any one of claims 1 to 3, characterized in that: The first metal segment is also provided with a process hole, which is located at one end of the first metal segment close to the wire winding segment and is used for dispensing glue and exhausting.

5. The optical fiber pressure sensor packaging structure according to any one of claims 1 to 3, characterized in that: The wire winding section is in a threaded tubular structure, and the threaded tubular structure is formed by braiding wires in a threaded winding form along the outer circumference of the optical fiber section; The starting end of the wire winding segment is welded to the first metal segment, and the ending end of the wire winding segment is welded to the second metal segment.

6. The optical fiber pressure sensor packaging structure according to claim 5, characterized in that: A protective layer is also provided between the wire winding segment and the corresponding optical fiber segment, and the protective layer is wrapped around the outer circumference of the corresponding optical fiber segment.

7. The optical fiber pressure sensor packaging structure according to any one of claims 1 to 3 and 6, characterized in that: Also includes: The packaged PI tube, the Haicui sleeve, the LC connector ferrule metal part, and the LC connector ferrule ceramic part are connected in sequence; The starting end of the packaged PI tube is sleeve-connected and fixed to one end of the second metal segment away from the wire winding segment.

8. An invasive micro blood pump, characterized in that: include: Fiber optic pressure sensor; The optical fiber pressure sensor packaging structure according to any one of claims 1 to 7, wherein the optical fiber pressure sensor is arranged inside the optical fiber pressure sensor packaging structure; an outflow chamber connected to the first metal segment; The micromotor comprises a tail cover, wherein the tail cover is connected to the second metal segment.

9. The invasive micro blood pump according to claim 8, characterized in that: A processing platform is provided on the surface of the outflow chamber, the surface height of the processing platform is higher than the surface height of the outflow chamber, a welding fixing groove is provided on the processing platform, the contour of the welding fixing groove is adapted to the outer contour of the first metal segment, so that the first metal segment can be embedded in the welding fixing groove and fixed by welding; The pressure sensing window faces away from the welding fixing groove.

10. The invasive micro blood pump according to claim 9, characterized in that: The welding fixing groove is a semicircular groove, the first metal segment is a circular tube structure, and the inner diameter of the semicircular groove matches the outer diameter of the first metal segment; When the first metal segment is fixed to the welding fixing groove, a preset gap is provided between the end of the first metal segment and the bottom of the welding fixing groove, which is suitable for injection and filling of curing glue.

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