Pressure sensing device and pressure sensing system based on implantable medical device

Abstract

The disclosed embodiments provide a pressure sensing device and a pressure sensing system based on an implantable medical device, and relate to the field of implantable medical devices. The device includes: a pressure sensor and a sensor bracket; the pressure sensor is arranged on the sensor bracket and fixed to the inside of the body by the sensor bracket; the pressure sensor includes: a sensor body, a pressure-sensitive diaphragm and a flow rate detection module; the flow rate detection module includes a support ring, a human-shaped elastic sheet, a second rectangular groove and a strain resistor; the pressure-sensitive diaphragm senses the fluid pressure and converts the fluid pressure into a resistance change, and when the fluid acts on the human-shaped elastic sheet, the fluid speed information is converted into a resistance change; the pressure sensing system uses a wireless transmission module to establish a signal connection with the pressure sensing device, collect and analyze information in the body, and obtain data through an external terminal device. The present invention reduces the volume of the detection device, improves the system integration, and is easy to implant into the body.

Description

Technical Field

[0001] The present disclosure relates to the technical field of implantable medical devices, and in particular to a pressure sensing device and a pressure sensing system based on an implantable medical device. Background Art

[0002] In today's medical field, implantable sensor devices have become a common monitoring method for more accurate and timely understanding of a patient's internal conditions. This method can, to a certain extent, provide real-time or periodic monitoring of a patient's physical condition, providing important evidence for doctors' diagnosis and treatment. However, traditional implantable sensor devices have significant limitations. Typically, these sensors only provide single data points such as blood pressure, temperature, or flow rate, and are unable to monitor multiple parameters simultaneously. When clinical needs require simultaneous acquisition of diverse data, multiple different sensor devices must be deployed. This not only greatly increases the difficulty of implantation, requiring more complex surgical procedures and higher technical requirements, but also may cause greater pain and risks to patients. Furthermore, the implantation of multiple sensor devices also limits their application scope to a certain extent, making them unable to meet the needs of multi-parameter monitoring in certain specific situations. Therefore, improving the integration of various functional modules while maintaining a small size and facilitating data collection by medical staff is a current challenge. Summary of the Invention

[0003] In order to address the deficiencies of the prior art, the embodiments of the present disclosure provide a pressure sensing device and a pressure sensing system based on an implantable medical device to address technical issues such as the inability of traditional implantable sensor devices to monitor multiple parameters simultaneously, the difficulty of implantation, the need for more complex surgical operations and higher technical requirements, the potential for greater pain and risks to patients, and the inability to meet the needs for multi-parameter monitoring in some specific situations.

[0004] In a first aspect, an embodiment of the present invention provides a pressure sensing device based on an implantable medical device, comprising: a pressure sensor and a sensor bracket; the pressure sensor is disposed on the sensor bracket and fixed to the inside of the body by the sensor bracket;

[0005] The pressure sensor includes: a sensor body, a pressure-sensitive diaphragm and a flow rate detection module; the sensor body includes a base, a first support part, a second support part, an annular groove and a first rectangular groove; the first support part and the second support part are sequentially arranged on the base; the first support part and the second support part are concentric cylinders, and the diameter of the first support part is larger than the diameter of the second support part; a cylindrical cavity with an open end is provided on the outward side of the second support part; the annular groove is concentrically provided on the top of the second support part, and the pressure-sensitive diaphragm is sealed inside the annular groove; the first rectangular groove is opened at the top edge of the second support part, and the bottom surface of the first rectangular groove is flush with the top surface of the pressure-sensitive diaphragm;

[0006] The pressure-sensitive diaphragm includes: a circular elastic sheet and a pressure-sensitive resistor; the pressure-sensitive resistor is provided on the outward side of the pressure-sensitive diaphragm;

[0007] The flow rate detection module includes a support ring, a human-shaped elastic sheet, a second rectangular groove and a strain resistor; the support ring is arranged on the outside of the second support part, the outer diameter of the support ring is the same as the outer diameter of the first support part, the inner diameter of the support ring is the same as the outer diameter of the second support part, and the height of the support ring is the same as the height of the second support part; the top of the support ring is provided with the second rectangular groove, the position of the second rectangular groove corresponds to the position of the first rectangular groove, and the bottom surface of the second rectangular groove is flush with the bottom surface of the first rectangular groove; the human-shaped elastic sheets are symmetrically arranged on both sides of the support ring, and the strain resistor is arranged on the human-shaped elastic sheet.

[0008] Optionally, the pressure-sensing resistor includes a radial resistor, an inner ring resistor and an outer ring resistor; the number of the radial resistors is 10, extending radially along the circular elastic sheet and distributed at equal intervals on the upper side of the circular elastic sheet; the number of the inner ring resistors is 5, distributed circumferentially and equidistantly on the inner ring of the circular elastic sheet; the number of the outer ring resistors is 5, distributed circumferentially and equidistantly on the outer ring of the circular elastic sheet; the diameter of the inner ring where the inner ring resistors are located is smaller than the diameter of the outer ring where the outer ring resistors are located; the inner ring resistors are connected to the inner side of the radial resistors at intervals, and the outer ring resistors are connected to the outer side of the radial resistors at intervals, and the inner ring resistors and the outer ring resistors are staggered; one of the outer ring resistors is cut in the middle, and an inlet wire and an outlet wire are connected to the break.

[0009] Optionally, the strain resistor is composed of multiple bent parts connected in series; the human-shaped elastic piece includes two bent parts and one vertical part, and the bent parts of the strain resistor are stacked at the intersection of the bent parts and the vertical parts of the human-shaped elastic piece.

[0010] Optionally, the cross-section of the outward end of the vertical portion is hemispherical, the intersection of the vertical portion and the curved portion is a first connection, the size of the first connection is smaller than the diameter of the hemispherical end, and the vertical portion between the hemispherical end and the first connection is a smooth transition surface; the intersection of the curved portion and the support ring is a second connection, the size of the second connection is larger than the size of the first connection, and the curved portion between the second connection and the first connection is a smooth transition surface.

[0011] Optionally, a first wiring terminal, a second wiring terminal and a third wiring terminal are provided in pairs on the side of the base facing the first support part; the first wiring terminal is connected to the lead-in line and the lead-out line of the pressure-sensing resistor; the second wiring terminal is connected to the lead-in line and the lead-out line of the left strain resistor; the third wiring terminal is connected to the lead-in line and the lead-out line of the right strain resistor.

[0012] Optionally, one of the second terminals and one of the third terminals are set in series to monitor the change in the total resistance of the strain resistors on the left and right sides; or, the second terminal and the third terminal are set independently to monitor the resistance of the strain resistors on the left and right sides respectively.

[0013] In a second aspect, an embodiment of the present disclosure provides a pressure sensing system based on an implantable medical device, comprising: a pressure sensing device based on an implantable medical device as described in the first aspect, an external terminal device, and a wireless transmission module; the wireless transmission module is connected to the pressure sensor for receiving and transmitting monitoring data to the external terminal device.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] 1. The pressure sensing system based on implantable medical devices uses a wireless transmission module to establish a signal connection with the permanently implanted pressure sensing device, collects and analyzes in vivo information, and conveniently detects the patient's in vivo data through an external terminal device (reader device). Clinical staff, non-clinical users or patients can determine the patient's in vivo information after appropriate training.

[0016] 2. The pressure sensing device based on the implantable medical device integrates the measurement functions of pressure, flow rate, etc. on the same substrate, providing doctors with more comprehensive and comprehensive information about the patient's body; in addition, the flow rate detection module is directly mounted on the sensor body, further reducing the size of the detection device, improving the system integration, and facilitating implantation in the body.

[0017] 3. The integrated design and flexible sensor bracket reduce the difficulty and risk of implant surgery, shortening patient pain and recovery time. Precise sensor design and wireless transmission technology ensure data accuracy and real-time availability, providing a reliable basis for doctors' diagnosis and treatment. The implementation of the wireless transmission module allows patients to monitor their condition at home or outside the hospital, with data transmitted to doctors in real time, improving the convenience and efficiency of medical services. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of a pressure sensing system based on an implantable medical device provided in one embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a pressure sensor in a pressure sensing device based on an implantable medical device provided in one embodiment of the present invention;

[0021] Figure 3 A schematic structural diagram of a sensor body in a pressure sensing device based on an implantable medical device provided by one embodiment of the present invention;

[0022] Figure 4 A schematic structural diagram of a pressure-sensitive diaphragm in a pressure sensing device based on an implantable medical device provided by one embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a flow rate detection module in a pressure sensing device based on an implantable medical device provided in one embodiment of the present invention;

[0024] Figure 6 A schematic structural diagram of a pressure sensor and its connection terminals in a pressure sensing device based on an implantable medical device provided in one embodiment of the present invention;

[0025] Figure 7 A schematic structural diagram of a pressure sensing device based on an implantable medical device provided in one embodiment of the present invention;

[0026] Figure 8 This is a structural schematic diagram of a wireless transmission module in a pressure sensing system based on an implantable medical device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0028] Those skilled in the art will understand that the terms "first", "second" and the like in the embodiments of the present disclosure are only used to distinguish different steps, devices or modules, etc., and do not represent any specific technical meaning, nor do they represent the necessary logical order between them. It should also be understood that in the embodiments of the present disclosure, "multiple" may refer to two or more, and "at least one" may refer to one, two or more. It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly defined or given a contrary revelation in the context. In addition, the term "and / or" in the present disclosure is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present disclosure generally indicates that the associated objects before and after are in an "or" relationship. It should also be understood that the description of each embodiment in the present disclosure emphasizes the differences between the embodiments, and the same or similar aspects thereof can be referenced to each other. For the sake of brevity, they will not be described one by one.

[0029] At the same time, it should be understood that for ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Technologies, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered part of the specification. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0031] like Figure 2-Figure 7As shown, an embodiment of the present invention provides a pressure sensing device based on an implantable medical device, comprising: a pressure sensor 1 and a sensor bracket 2; the pressure sensor 1 is disposed on the sensor bracket 2 and fixed to the inside of the body (blood vessel) by the sensor bracket 2;

[0032] The pressure sensor 1 includes: a sensor body 11, a pressure-sensitive diaphragm 12, and a flow rate detection module 13;

[0033] The sensor body 11 includes a base 111 , a first support portion 112 , a second support portion 113 , an annular groove 114 and a first rectangular groove 115 ;

[0034] The base 111 is sequentially provided with a first support portion 112 and a second support portion 113. The first support portion 112 and the second support portion 113 are concentric cylinders, with the diameter of the first support portion 112 being larger than that of the second support portion 113, allowing for easy adaptation to blood vessels of varying sizes or providing specific fluid dynamics properties. A cylindrical cavity with one end open is provided on the outward side of the second support portion 113. An annular groove 114 is concentrically provided at the top of the second support portion 113, sealingly housing the pressure-sensitive diaphragm 12. The first rectangular groove 115 (wire-passing groove) is provided at the top edge of the second support portion 113, with the bottom surface of the first rectangular groove 115 flush with the top surface of the pressure-sensitive diaphragm 12. This layered and concentric cylindrical design of the sensor body 11 provides a stable support structure while facilitating the installation and positioning of other components.

[0035] The pressure-sensitive diaphragm 12 includes: a circular elastic sheet 121 and a pressure-sensitive resistor 122; the pressure-sensitive resistor 122 is provided on the outward side of the pressure-sensitive diaphragm 12. When the external pressure changes, the circular elastic sheet 121 will deform, thereby changing the resistance value of the pressure-sensitive resistor 122, thereby realizing pressure measurement.

[0036] The flow rate detection module 13 includes a support ring 131, a humanoid elastic sheet 132, a second rectangular groove 133 and a strain resistor 134; the support ring 131 is arranged on the outside of the second support portion 113, the outer diameter of the support ring 131 is the same as the outer diameter of the first support portion 112, the inner diameter of the support ring 131 is the same as the outer diameter of the second support portion 113, and the height of the support ring 131 is the same as the height of the second support portion 113; a second rectangular groove 133 (wire passing groove) is opened on the top of the support ring 131, and the position of the second rectangular groove 133 is the same as that of the first rectangular groove 134. The second rectangular groove 133 is located in the support ring 131, and the bottom surface of the second rectangular groove 133 is flush with the bottom surface of the first rectangular groove 115. This design allows cables or wires to pass through smoothly, avoiding bending or jamming of the cables, and ensuring the stability and reliability of signal transmission. The support ring 131 is symmetrically provided with human-shaped elastic sheets 132 on both sides, and the human-shaped elastic sheets 132 are provided with strain resistors 134. When the fluid flows through and generates a force, the human-shaped elastic sheets 132 will deform, thereby changing the resistance value of the strain resistors 134, thereby achieving the measurement of the flow rate. The design of the flow rate detection module 13 enables the device to not only measure pressure, but also detect the flow rate of the fluid at the same time.

[0037] According to the above-mentioned embodiments of the present disclosure, by integrating the pressure sensor and the flow rate detection module, simultaneous monitoring of blood pressure and flow rate is achieved, providing doctors with more comprehensive information about the patient's body. The integrated design and the flexibility of the sensor bracket reduce the difficulty and risk of the implantation surgery, reducing the patient's pain and recovery time. Through precise sensor design and wireless transmission technology, the accuracy and real-time nature of the data are ensured, providing a reliable basis for doctors' diagnosis and treatment. The implementation of the wireless transmission module allows patients to be monitored at home or outside the hospital, and the data can be transmitted to the doctor in real time, improving the convenience and efficiency of medical services.

[0038] Optionally, the pressure-sensitive diaphragm 12 is an elastic diaphragm, and its material includes metal, quartz, rubber, etc.

[0039] Optionally, the pressure-sensing resistor 122 includes a radial resistor 1221, an inner ring resistor 1222 and an outer ring resistor 1223; the number of the radial resistors 1221 is 10, which extend radially along the circular elastic sheet 121 and are evenly spaced on the upper side of the circular elastic sheet 121. Through this design, the radial pressure changes generated by the fluid on the circular elastic sheet 121 can be accurately sensed, thereby providing accurate flow rate information; the number of the inner ring resistors 1222 is 5, which are equidistantly distributed circumferentially on the inner ring of the circular elastic sheet 121; the number of the outer ring resistors 1223 is 5, which are equidistantly distributed circumferentially on the outer ring of the circular elastic sheet 121. By distributing the inner ring resistors 1222 and the outer ring resistors 1223 equidistantly on the inner ring and outer ring of the circular elastic sheet 121 respectively, the pressure changes of the fluid on different positions of the circular elastic sheet 121 can be sensed, thereby further improving the accuracy of flow rate detection. The staggered distribution of the inner and outer ring resistors helps more comprehensively capture changes in fluid pressure. The inner ring, where the inner ring resistors 1222 reside, has a smaller diameter than the outer ring, where the outer ring resistors 1223 reside. The inner ring resistors 1222 are spaced apart from each other, connecting to the inner side of the radial resistors 1221. The outer ring resistors 1223 are spaced apart from each other, interlaced with each other. One outer ring resistor 1223 is cut in the middle, with lead-in and lead-out wires connected to the cut, facilitating connection of the pressure-sensing resistors 122 to external circuitry for signal transmission and processing.

[0040] Optionally, the support ring 131 and the humanoid elastic piece 132 are integrally molded from elastic rubber. This integral molding design improves the integrity and stability of the structure and avoids measurement errors caused by loose or displaced components. The elastic rubber material has good elasticity and durability, capable of withstanding the impact and pressure of the fluid while maintaining the sensitivity of the humanoid elastic piece 132.

[0041] Optionally, the strain resistor 134 is composed of multiple bent parts connected in series, so that the strain resistor 134 can change its resistance more sensitively when subjected to the deformation of the human-shaped elastic sheet 132, thereby improving the accuracy of flow rate detection; the human-shaped elastic sheet 132 includes two bent parts and a vertical part, and the bent parts of the strain resistor 134 are stacked at the intersection of the bent parts and the vertical parts of the human-shaped elastic sheet 132. This position is the area where the deformation of the human-shaped elastic sheet 132 is most obvious. Setting the strain resistor 134 here can capture the deformation signal to the maximum extent, further improving the accuracy of the measurement.

[0042] Optionally, the cross-section of the outward end of the vertical portion is hemispherical, and the intersection of the vertical portion and the curved portion is a first connection. The size of the first connection is smaller than the diameter of the hemispherical end, and the vertical portion between the hemispherical end and the first connection is a smooth transition surface, thereby increasing the force-bearing area and improving the stability of the measurement; the intersection of the curved portion and the support ring 131 is a second connection. The size of the second connection is larger than the size of the first connection, and the curved portion between the second connection and the first connection is a smooth transition surface, which increases the force-bearing area of ​​the end of the human-shaped elastic sheet, helps to transmit and disperse the force, can improve the accuracy of the measurement while reducing the size of the first connection, and indirectly increase the sensing sensitivity.

[0043] Optionally, a first terminal 123, a second terminal 135 and a third terminal 136 are provided in pairs on one side of the base 111 facing the first support portion 112; the first terminal 123 is connected to the lead-in wire and the lead-out wire of the pressure-sensing resistor 122; the second terminal 135 is connected to the lead-in wire and the lead-out wire of the left strain resistor 134; and the third terminal 136 is connected to the lead-in wire and the lead-out wire of the right strain resistor 134.

[0044] In the above embodiment, the first, second and third wiring terminals arranged in pairs are respectively connected to the lead-in wires and lead-out wires of the pressure-sensing resistor and the strain resistor, which can facilitate the input and output of signals.

[0045] Optionally, the second terminal 135 and the third terminal 136 are arranged in series, which can provide a flexible monitoring method, reduce measurement errors, and monitor changes in the total resistance of the strain resistors 134 on the left and right sides; or, the second terminal 135 and the third terminal 136 are set independently to monitor the resistance of the strain resistors 134 on the left and right sides respectively (in this case, only the resistance of one side can be monitored, and the other one can be used as a backup; or the resistance of the strain resistors on the left and right sides can be monitored at the same time, and the measurement value can be obtained by taking the average to reduce measurement errors).

[0046] Optionally, the pressure-sensing resistor 122 and the strain resistor 134 are both made of conductive strain materials, and their resistance increases with the increase of deformation, thereby enabling direct measurement of pressure and strain.

[0047] Optionally, a temperature-sensing resistor is provided on the inner side of the base 111 for monitoring the fluid temperature and providing additional physiological parameter information.

[0048] Optionally, the pressure sensor 1 is manufactured using MEMS technology, including but not limited to thin film deposition, photolithography, etching, packaging and other processes, which can improve the miniaturization, integration and reliability of the sensor.

[0049] Optionally, the sensor holder 2 includes a sensor support plate 21 and a retractable elastic frame 22; the sensor support plate 21 and the retractable elastic frame 22 are integrally formed (e.g., by laser cutting); the retractable elastic frame 22 is provided on both sides of the sensor support plate 21; the retractable elastic frame 22 includes four M-shaped frames and four W-shaped frames, the four M-shaped frames connected end-to-end to form a first hollow ring, and the four W-shaped frames connected end-to-end to form a second hollow ring, with the first hollow ring and the second hollow ring being concentrically connected; the four M-shaped frames connected end-to-end have four first connection points, and the four W-shaped frames connected end-to-end have four second connection points, with the first connection points corresponding to the second connection points; the number of sensor support plates 21 is four and they are equidistantly distributed in a circular pattern, and the sensor support plates 21 have the same length and may have the same or different widths. In this embodiment, the sensor support plate and the retractable elastic frame are integrally formed, resulting in a stable structure and ease of manufacture. The design of the retractable elastic frame enables the sensor holder to adapt to implantation sites of varying sizes, improving the convenience and comfort of implantation.

[0050] Optionally, the sensor support plate 21 is provided with a mounting groove, which matches the size of the pressure sensor 1. The mounting groove provided on the sensor support plate matches the size of the pressure sensor, ensuring stable installation of the sensor.

[0051] Optionally, the sensor body 11 is made of Si, SiO 2 , ceramics, inert metals, etc., and is prepared by sputtering, evaporation, photolithography, etching, etc. to improve the performance and durability of the sensor.

[0052] Optionally, the outer surfaces of the lead-in wire, lead-out wire, conductive wire, pressure-sensitive resistor, strain resistor, etc. are all provided with a waterproof coating layer, and the coating layer is silicone resin, polyimide, etc., to improve the waterproof performance of the sensor and ensure the accuracy of the measurement.

[0053] Optionally, the sensor bracket 2 is made of stainless steel, cobalt-chromium alloy, titanium alloy, etc., which can improve the strength and corrosion resistance of the bracket; the sensor bracket 2 can be curled to a radially compressed state and expanded in the patient's body through an expansion mechanism such as an inflatable balloon, which is convenient for implantation and removal.

[0054] like Figure 1 、 Figure 8 As shown, an embodiment of the present invention provides a pressure sensing system based on an implantable medical device, comprising: the pressure sensing device based on the implantable medical device, an external terminal device, and a wireless transmission module 3;

[0055] The wireless transmission module 3 is connected to the pressure sensor 1 and is used to receive and transmit monitoring data to an external terminal device.

[0056] Optionally, the wireless transmission module 3 includes a wireless transmission body 31, an upper packaging layer 32, and a lower packaging layer 33; the lower packaging layer 33 is provided with a groove, the wireless transmission body 31 is arranged in the groove, and the upper packaging layer 32 is sealed on the upper side of the lower packaging layer 33; the wireless transmission body 31 includes a flexible circuit board 311, a receiving coil 312, a processing chip 313, a power supply circuit, a front-end processing circuit, a Bluetooth module, a super capacitor 314, and a storage module; the flexible circuit board 311 is provided with a receiving coil 312, a processing chip 313, a power supply circuit, a front-end processing circuit, a Bluetooth module, a super capacitor 314, and a storage module;

[0057] The receiving coil 312 is a circular coil, and the other components are arranged on the inner side of the receiving coil 312. This design can improve reception efficiency and save space. The receiving coil 312 and the super capacitor 314 are electrically connected to the power supply circuit respectively. The front-end processing circuit, the Bluetooth module, the storage module, and the power supply circuit are electrically connected to the processing chip 313 respectively. The front-end processing circuit is electrically connected to the monitoring sensor. Power is received through the receiving coil, and data is transmitted to an external terminal device through the Bluetooth module. Through this solution, the wireless transmission module 3 can realize wireless transmission of in-vivo data to an external terminal device, so that patients can understand their physiological conditions in real time without having to go to the hospital for frequent examinations, thereby improving the convenience and efficiency of medical services.

[0058] Optionally, the external terminal device is a mobile phone, notebook, desktop computer, etc.

[0059] Optionally, the wireless transmission module 3 is arranged between the subcutaneous fat layer and the dermis layer, which can reduce the impact of the implant on the patient and improve comfort.

[0060] Optionally, the upper packaging layer 32 and the lower packaging layer 33 are made of polyimide, which can improve the durability and waterproof performance of the module.

[0061] Working principle of pressure sensing device and system based on implantable medical device:

[0062] 1. Pressure measurement in pressure sensing devices: The pressure-sensitive diaphragm senses the fluid pressure, converts the fluid pressure into resistance changes, and collects and transmits data through the wireless transmission module.

[0063] 2. Flow rate measurement in the pressure sensing device: When the fluid acts on the humanoid elastic sheet, it will cause the humanoid elastic sheet to deform (both the vertical part and the curved part will produce a certain degree of bending). At this time, the resistance of the strain resistor changes, converting the fluid velocity information into resistance change, and the data is collected and transmitted through the wireless transmission module.

[0064] 3. Working principle of pressure sensing system: External terminal equipment collects and analyzes in vivo data through wireless transceiver module to monitor blood pressure, flow rate, etc.

[0065] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0066] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present disclosure. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments shown herein, but is intended to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A pressure sensing device based on an implantable medical device, characterized in that: include: Pressure sensor, sensor bracket; The pressure sensor is arranged on the sensor bracket and fixed to the inside of the body by the sensor bracket; The pressure sensor comprises: a sensor body, a pressure-sensitive diaphragm and a flow rate detection module; the sensor body comprises a base, a first support part, a second support part, an annular groove and a first rectangular groove; the first support part and the second support part are sequentially arranged on the base; the first support part and the second support part are concentric cylinders, and the diameter of the first support part is larger than the diameter of the second support part; a cylindrical cavity with an open end is arranged on the outward side of the second support part; the annular groove is concentrically arranged on the top of the second support part, and the pressure-sensitive diaphragm is sealed inside the annular groove; the first rectangular groove is opened at the top edge of the second support part, and the bottom surface of the first rectangular groove is flush with the top surface of the pressure-sensitive diaphragm; The pressure-sensitive diaphragm comprises: a circular elastic sheet and a pressure-sensitive resistor; a pressure-sensitive resistor is arranged on the outward side of the pressure-sensitive diaphragm; The flow rate detection module includes a support ring, a human-shaped elastic sheet, a second rectangular groove and a strain resistor; the support ring is arranged on the outside of the second support part, the outer diameter of the support ring is the same as the outer diameter of the first support part, the inner diameter of the support ring is the same as the outer diameter of the second support part, and the height of the support ring is the same as the height of the second support part; the top of the support ring is provided with the second rectangular groove, the position of the second rectangular groove corresponds to the position of the first rectangular groove, and the bottom surface of the second rectangular groove is flush with the bottom surface of the first rectangular groove; the human-shaped elastic sheets are symmetrically arranged on both sides of the support ring, and the strain resistor is arranged on the human-shaped elastic sheets.

2. The pressure sensing device according to claim 1, characterized in that: in, The pressure-sensing resistor includes radial resistors, inner ring resistors and outer ring resistors; the number of the radial resistors is 10, extending radially of the circular elastic sheet and distributed at equal intervals on the upper side of the circular elastic sheet; the number of the inner ring resistors is 5, distributed circumferentially and equidistantly on the inner ring of the circular elastic sheet; the number of the outer ring resistors is 5, distributed circumferentially and equidistantly on the outer ring of the circular elastic sheet; the diameter of the inner ring where the inner ring resistors are located is smaller than the diameter of the outer ring where the outer ring resistors are located; the inner ring resistors are connected to the inner side of the radial resistors at intervals, the outer ring resistors are connected to the outer side of the radial resistors at intervals, and the inner ring resistors and the outer ring resistors are staggered; one of the outer ring resistors is cut in the middle, and an inlet wire and an outlet wire are connected to the break.

3. The pressure sensing device according to claim 2, characterized in that: in, The strain resistor is composed of a plurality of bending parts connected in series; the human-shaped elastic sheet includes two bending parts and a vertical part, and the bending parts of the strain resistor are stacked and arranged at the intersection of the bending parts and the vertical parts of the human-shaped elastic sheet.

4. The pressure sensing device according to claim 3, characterized in that: in, The cross-section of the outward end of the vertical portion is hemispherical, the intersection of the vertical portion and the curved portion is a first connection, the size of the first connection is smaller than the diameter of the hemispherical end, and the vertical portion between the hemispherical end and the first connection is a smooth transition surface; the intersection of the curved portion and the support ring is a second connection, the size of the second connection is larger than the size of the first connection, and the curved portion between the second connection and the first connection is a smooth transition surface.

5. The pressure sensing device according to claim 4, characterized in that: in, A first terminal, a second terminal and a third terminal are arranged in pairs on one side of the base facing the first supporting part; the first terminal is connected to the lead-in line and the lead-out line of the pressure-sensing resistor; the second terminal is connected to the lead-in line and the lead-out line of the left strain resistor; the third terminal is connected to the lead-in line and the lead-out line of the right strain resistor.

6. The pressure sensing device according to claim 5, characterized in that: in, One of the second terminals is arranged in series with one of the third terminals to monitor the change in the total resistance of the strain resistors on the left and right sides; or the second terminal and the third terminal are independently arranged to monitor the resistance of the strain resistors on the left and right sides respectively.

7. A pressure sensing system based on an implantable medical device, characterized in that: include: A pressure sensing device based on an implantable medical device, an external terminal device and a wireless transmission module as described in any one of claims 1 to 6 above; the wireless transmission module is connected to the pressure sensor and is used to receive and transmit monitoring data to the external terminal device.

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