Pressure detection device and method

Abstract

The invention provides a pressure measuring device and method applied to fluid. The pressure measuring device comprises a pressure conversion module which is used for receiving fluid through a pipeline area and converting the pressure of the fluid into the pressure of an isolation medium; the pressure detection module is arranged at the end, away from the fluid, of the pressure conversion module and used for detecting pressure data borne by the isolation medium in real time; and the pressure analysis module is used for receiving the pressure data of the isolation medium and analyzing the fluid pressure according to a preset algorithm. According to the invention, the pressure transmission module with volume difference is designed, the compressibility of the isolation medium is utilized, the pressure signal is transmitted through the isolation medium to realize indirect measurement of the fluid pressure, and meanwhile, the device can better adapt to the application scene of intermittent or continuous detection.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure measurement, and in particular relates to a pressure detection device and method. Background Art

[0002] Traditional methods of fluid pressure detection typically rely on direct contact pressure sensors, which sense fluid pressure through the sensor's elastic diaphragm or other sensing elements and convert it into an electrical signal for measurement. This measurement method causes the fluid to contact the sensor, which can easily corrode and contaminate the sensor, affecting the sensor's service life and measurement accuracy. It also makes maintenance complex and lacks adaptability.

[0003] In order to address the limitations and other shortcomings of direct fluid measurement in practical applications, the prior art CN116549775A further proposes setting a deformable fluid pipe made of elastic material or the like on the inner wall of the fluid flow channel, and detecting the real-time pressure by detecting the deformation of the pipe wall. However, the detection accuracy is low, and the detection accuracy of this method is greatly affected by the thickness and hardness of the pipe wall, resulting in poor consistency. Summary of the Invention

[0004] In order to solve the problems of sensor loss, contamination, and measurement errors that may result from direct contact of a fluid-free pressure sensor with the fluid, a first aspect of the present invention provides a non-contact fluid pressure detection device for fluid pressure detection, the device comprising:

[0005] a pressure conversion module, configured to receive the fluid through the pipeline area and convert the pressure of the fluid into the pressure of the isolation medium;

[0006] A pressure detection module, provided at an end of the pressure conversion module away from the fluid, for detecting pressure data of the isolation medium in real time;

[0007] The pressure analysis module is used to receive the pressure data of the isolation medium and analyze the fluid pressure according to a preset algorithm.

[0008] In an implementation of the first aspect, the pressure conversion module includes:

[0009] a storage unit, configured to pre-store the isolation medium and receive at least part of the fluid provided by the fluid supply module;

[0010] The state changing unit is used to change the state of the isolation medium by flowing the fluid in the storage unit.

[0011] In one implementation of the first aspect, the pressure conversion module includes a plurality of connected pipeline areas, a first pipeline area directly connected to the pressure detection module and one or more adjacent second pipeline areas have a volume difference, and the plurality of pipeline areas also include an isolation medium for maintaining fluid isolation.

[0012] In an implementation of the first aspect, the state changing unit includes:

[0013] The medium compression subunit is used to generate a force acting on the isolation medium through the volume change of the fluid, and compress the isolation medium from the first predetermined interval of the storage unit to the second predetermined interval of the storage unit through the force.

[0014] In an implementation of the first aspect, the pressure conversion module further includes: a pressure transmission unit, configured to convert the pressure of the fluid into the pressure of the compressed isolation medium and transmit the pressure to the pressure detection module.

[0015] In an implementation of the first aspect, the pressure detection module includes at least one non-flow-through pressure sensor for collecting real-time pressure data of the isolation medium.

[0016] In an implementation of the first aspect, the pressure detection device further includes: an alarm module arranged between the pressure conversion module and the pressure detection module, the alarm module including at least one liquid level sensor for issuing an alarm when it is detected that the fluid volume in the pressure conversion unit exceeds a predetermined volume.

[0017] In an implementation of the first aspect, the pressure detection device further includes:

[0018] A fluid supply module, configured to provide a driving force for the fluid to drive the fluid to flow;

[0019] a fluid delivery module, connected to the fluid supply module, and configured to deliver the fluid through the fluid supply module;

[0020] The flow diversion module is provided between the fluid delivery module and the pressure conversion module. The flow diversion module enables at least part of the fluid delivered by the fluid delivery module to be received by the pressure conversion module.

[0021] In an implementation of the first aspect, the isolation medium is gas.

[0022] A second aspect of the present invention provides a pressure detection method, which is applied to the pressure detection device in any implementation of the first aspect, the method comprising:

[0023] receiving the fluid through a conduit region;

[0024] Converting the pressure of the fluid into the pressure of the isolation medium and detecting the pressure data of the isolation medium in real time;

[0025] The pressure data of the isolation medium is received, and the fluid pressure is analyzed according to a preset algorithm to output the pressure result of the fluid.

[0026] A third aspect of the present invention provides a medical device, comprising the pressure detection device in any implementation described in the first aspect.

[0027] The present invention is based on the fact that when a fluid (such as a liquid, etc.) flows in a conduit, it has a certain pressure. When the fluid interacts with the isolation medium, the fluid pressure is applied to the isolation medium through conduction, causing the isolation medium to be compressed. By utilizing the volume difference designed for multiple pipeline areas of the pressure transmission module that stores the isolation medium, and based on the principle that the isolation medium is compressed to increase the pressure of the isolation medium, the pressure sensor transmits the pressure signal through the isolation medium to achieve indirect measurement of the fluid pressure, without the need for direct contact with the fluid, thus avoiding fluid corrosion, contamination or damage to the pressure sensor. By adjusting the volume difference of the pipeline area of ​​the pressure conversion module, the distance between the pressure sensor and the fluid can be accurately adjusted, thereby adjusting the non-contact measurement range of the sensor, and being able to adapt to the detection requirements of different pressure ranges. After the fluid supply module of the pressure detection device of the present invention stops working, the compressed isolation medium pushes the fluid back, and the initial state can be restored without additional operation, which can better adapt to the application scenarios of intermittent or continuous detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 shows a schematic structural diagram of a pressure detection device;

[0030] Figure 2 shows a schematic structural diagram of a pressure detection device;

[0031] Figure 3 A schematic structural diagram of a pressure detection device corresponding to a specific embodiment 1 is shown;

[0032] Figure 4 A schematic structural diagram of a pressure detection device corresponding to a second specific embodiment is shown;

[0033] Figure 5 A schematic structural diagram of a pressure detection device corresponding to a third specific embodiment is shown;

[0034] Figure 6 A schematic structural diagram of a pressure detection device corresponding to a fourth specific embodiment is shown;

[0035] Figure 7 A flow chart of the pressure detection method is given. DETAILED DESCRIPTION

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention in specific contexts.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0038] See also Figure 1 , a schematic structural diagram of a pressure detection device 1 is provided. The pressure detection device provided by the present invention can be applied to the pressure detection needs when injecting fluid into a body cavity in the medical field. Of course, it can also be applied to pressure detection in industrial fields such as food and chemical industries. The system design of fluid pressure measurement can also be customized according to different industrial environments (such as high temperature, high humidity, corrosive gases, etc.) to meet different process requirements.

[0039] Specifically, the pressure detection device 1 includes:

[0040] The pressure conversion module 10 is used to receive a portion of the fluid through the pipeline area and convert the pressure of the fluid into the pressure of the isolation medium.

[0041] The pressure detection module 11 is provided at the end of the pressure conversion module away from the fluid, and is used to detect the pressure data of the isolation medium in real time.

[0042] The pressure analysis module 12 is used to receive the pressure data of the isolation medium and analyze the fluid pressure according to a preset algorithm.

[0043] The pressure conversion module 10 includes:

[0044] The storage unit 121 is used to pre-store the isolation medium and receive at least part of the fluid provided by the fluid supply module.

[0045] The state changing unit 122 is configured to change the state of the isolation medium by causing the fluid to flow through the storage unit.

[0046] In which, the pressure conversion module 10 includes multiple connected pipeline areas, and the multiple pipeline areas include isolation media that can maintain the fluid and the pressure detection module 11 in an isolated state. There is a volume difference between the first pipeline area directly connected to the pressure detection module and one or more adjacent second pipeline areas.

[0047] The state changing unit 122 includes a medium compression subunit 1221 for generating a force acting on the isolation medium through the volume change of the fluid, and compressing the isolation medium from the first predetermined interval of the storage unit 121 to the second predetermined interval of the storage unit 121 through the force.

[0048] The pressure conversion module 10 also includes: a pressure transmission unit 123 for converting the pressure of the fluid into the pressure of the compressed isolation medium and transmitting it to the pressure detection module 11. It can be understood that the volume adjustment can be achieved by directly increasing or decreasing the diameter of the pipeline area, thereby changing its internal volume; or adjusting the length of the adjacent pipeline area to directly affect the volume of the internal space; or adding a space-occupying structure (such as a built-in volume reduction block) inside the catheter to reduce the effective volume of the catheter. For pipeline areas that need to have a volume difference, the volume difference or the adjustment of the volume difference can be achieved in at least one or more ways. The existence of the volume difference can form a buffering and amplification effect during the gas compression process, making the gas compression process smoother within a certain pressure range, ensuring that the sensor can detect sufficiently large pressure changes, and the distance between the isolation medium and the sensor prevents the fluid from directly contacting the sensor.

[0049] The pressure detection module 11 includes at least one non-flow-through pressure sensor 13a for collecting real-time pressure data of the isolation medium. For example, the non-flow-through pressure sensor can be any of a non-flow-through absolute pressure sensor, a non-flow-through gauge pressure sensor, or a non-flow-through differential pressure sensor.

[0050] In one embodiment, the pressure analysis module 12 is used to process the collected real-time pressure data and analyze the fluid according to a preset algorithm. Furthermore, the pressure signal of the isolation medium can also be corrected and compensated by the microprocessor and a preset model to improve the measurement accuracy of the fluid pressure.

[0051] It is understood that when the fluid is isolated from the non-flow-through pressure sensor by an isolation medium, it can respond in real time to minute pressure changes in the isolation medium, supporting detection of multiple pressure ranges (e.g., low pressure, high pressure) to accommodate different fluid characteristics and operational requirements. Based on the real-time pressure data collected by the pressure acquisition unit 141 and converted into an electrical signal, the pressure analysis unit 142 analyzes the fluid pressure using a preset mathematical model (e.g., the relationship between pressure and compression ratio). The analyzed real-time pressure value can also be output to a display module or used for further feedback or operation.

[0052] See also Figure 2 In one embodiment, the pressure detection device 1 further comprises:

[0053] The fluid supply module 13 is used to provide driving force for the fluid to drive the fluid to flow.

[0054] The fluid delivery module 14 is connected to the fluid supply module and is used to deliver the fluid through the fluid supply module.

[0055] The power source of the fluid supply module 13 can be derived from a peristaltic pump, a syringe pump, a pressure pump, or can be a relatively high-pressure body fluid or the like. It can provide the delivery of fluid by a forward power source, and can also provide the attraction of fluid by a reverse power source. One end 11a of the fluid delivery module 14 is connected to the fluid supply module 13, and the other end 11b is connected to the diversion interface 151 of the liquid diversion module 15. 11b can be an open end or a closed end, and the fluid of the fluid delivery module 14 is diverted through the diversion interface 151 of the liquid diversion module 15.

[0056] After the power source of the fluid supply module 13 is turned on, at least a portion of the fluid enters the fluid delivery module 12 under the injection pressure. As the volume of the fluid increases, the fluid gradually occupies the space of the isolation medium, so that the isolation medium is continuously compressed. The isolation medium is compressed from the first predetermined area to the second predetermined area, thereby converting the pressure of the fluid in the fluid delivery module 12 into the pressure of the isolation medium through the pressure conversion module 13. The pressure detection module 11 is isolated from the fluid by the isolation medium. The pressure of the isolation medium is detected by the pressure detection module 11 and converted into the pressure of the fluid, thereby realizing non-contact fluid pressure measurement.

[0057] In one embodiment, the pressure detection device 1 is provided with a diversion module 15 between the fluid delivery module 14 and the pressure conversion module 10. The diversion module 15 realizes the diversion of the fluid of the fluid delivery module 14 before entering the pressure conversion module 10. At least part of the fluid delivered by the fluid delivery module 14 is received by the pressure conversion module 10, and the other part enters the instrument filling port or other containers.

[0058] One end 151a of the diversion interface 151 of the diversion module 15 is connected to the pressure conversion module 10, and the other end 151b can be closed or open. When it is open, 151b can be connected to the injection port of a device such as a scalpel or lithotomy basket. When it is closed, 151b can be connected to the filling port of a device such as a lithotomy balloon or balloon dilation catheter.

[0059] In one embodiment, the diversion module 15 can be implemented by a three-way valve or a four-way valve.

[0060] In one embodiment, the fluid includes contrast agent, physiological saline, etc., which flows along the shunt interface to the injection port at the open end and enters the body cavity.

[0061] In one embodiment, the fluid may also be body fluid, which is output from a body cavity and enters the pressure conversion module 10 .

[0062] In one embodiment, the isolation medium may be a gas, including air, an inert gas, nitrogen, or other gas that is poorly soluble in the fluid and does not readily react with the fluid.

[0063] In one embodiment, the pipeline area used by the pressure conversion module 10 and the fluid delivery module 14 includes a biocompatible PVC hard tube, a Teflon hard tube, a biocompatible silicone hose, etc.

[0064] In one embodiment, in order to prevent the fluid from entering the isolation medium area and contacting the non-circulation pressure sensor when the fluid volume of the pressure detection device exceeds a predetermined range, causing the non-circulation pressure sensor to be contaminated or damaged, the pressure detection device 1 may further include an alarm module 16 disposed between the pressure conversion module 10 and the pressure detection module 11, which is used to monitor the interface between the fluid and the isolation medium in real time based on the liquid level sensor 16a of the alarm module 16 to ensure that the boundary between the two is clear, avoid direct contact of the fluid with the non-circulation pressure sensor, and can issue an alarm when it detects that the fluid volume of the pressure conversion module 10 exceeds the predetermined volume. If the isolation medium is over-compressed or the fluid is overfilled, the boundary interface between the two may move to the critical position of the non-circulation pressure sensor. In this case, the liquid level sensor 16a can trigger an alarm in time to prevent the non-contact pressure sensor 16a of the pressure detection module 14 from contacting the fluid and causing the pressure detection device to fail.

[0065] In one embodiment, the liquid level sensor of the warning module 16 may be a photoelectric or capacitive liquid level sensor.

[0066] This technical solution enables medical equipment to accurately control the speed and pressure of fluid injection during endoscopic examinations, laparoscopic surgery, or catheter infusion operations to ensure safety and effectiveness.

[0067] See also Figures 2 to 5 The pressure detection device provided by the present invention can realize non-contact intermittent and continuous detection of fluid pressure. The specific implementation of each module of the pressure detection device will be described in detail below. Specific implementation method 1

[0069] See also Figure 2 The fluid supply module 13 can provide a power source for fluid delivery via a peristaltic pump 10a. The fluid passes through the delivery pipeline 111 of the fluid delivery module 14 and is diverted by the diversion interface 151 of the liquid diversion module 15. This allows a portion of the fluid to enter the pressure conversion module 10 through one end 151a of the diversion interface 151 of the liquid diversion module 15, while another portion of the fluid enters the device filling port or a predetermined container through the other end 151b of the diversion interface 151 of the liquid diversion module 15. The pressure transmission unit 121 of the pressure conversion module 10 includes a first conduit A1, a second conduit A2, and a third conduit A3, all connected in sequence and filled with an isolation medium. The volume of the second conduit A2 is larger than that of the third conduit A3. One end of the first conduit A1 is connected to one end 151a of the diversion interface. The connections between the first conduit A1 and the second conduit A2, and between the second conduit A2 and the third conduit A3, are sealed via reducing straight-through joints. The pressure detection module 11 includes a non-flow-through pressure sensor 13a connected to the distal end of the third conduit A3. As peristaltic pump 10a continues to operate, fluid enters first conduit A1 and, under the action of peristaltic pump 10a, gradually fills second conduit A2 as pressure rises. The air in second conduit A2 is then gradually compressed into third conduit A3. Due to the predetermined volume difference between second conduit A2 and third conduit A3, the isolation medium is compressed within a pressure range based on the volume change of the fluid, resulting in a volume change of the isolation medium. This causes the isolation medium to be compressed from a first predetermined range within a certain pressure range to a second predetermined range at a certain distance from pressure detection module 11, thereby causing a pressure change. The isolation medium is compressed within this pressure range and remains at a certain distance from non-flow-through pressure sensor 7a. This allows non-flow-through pressure sensor 13a at the distal end of third conduit A3 to detect pressure changes in the isolation medium in real time.

[0070] After the peristaltic pump 10a stops working, the compressed isolation medium will press the fluid in the first conduit A1, the second conduit A2, and the third conduit A3 back into the delivery pipeline 111 of the fluid delivery module 14, thereby achieving non-contact intermittent continuous detection between the fluid and the non-circulation pressure sensor.

[0071] At the same time, the isolation medium pressure can be adjusted by controlling the fluid pressure, and the distance between the fluid and the non-circulating pressure sensor 13a can be changed by changing the volume difference between the second conduit A2 and the third conduit A3 to obtain high-precision sensor measurement results.

[0072] In this embodiment, to further reduce the risk of the non-flow-through pressure sensor in the pressure detection module 11 of the pressure measurement device 1 coming into contact with fluid and impacting its normal operation, a liquid level sensor 16a is provided between the third conduit A3 and the non-flow-through pressure sensor 13a. This liquid level sensor 16a can issue an alarm when the fluid volume reaches a specified position in the second conduit A3, thereby ensuring the reliability of the entire pressure detection device. In this embodiment, a capacitive liquid level sensor 16a, connected to the third conduit A3 via a clamp-type tube, can be used to provide an alarm when the fluid volume threshold is reached. Specific implementation method 2

[0074] The parts that are the same as those in the first embodiment will not be described again.

[0075] See also Figure 3 The pressure transmission unit 121 of the pressure conversion module 10 includes a first conduit B1 containing an isolation medium. B1 is divided into a first region P1 and a second region P2 along the direction of fluid flow. Region P1 is the isolation medium storage area in the first conduit B1 at the maximum output pressure of the fluid supply module 13. Region P2 is the fluid storage area in the first conduit B1 at the maximum output pressure of the fluid supply module 13. The volume of region P2 is greater than that of region P1. One end of region P2 of the first conduit B1 is connected to one end 151a of the diversion interface 151 of the liquid diversion module 15, and the distal end of region P1 of the first conduit B1 is connected to the pressure detection module 11.

[0076] The peristaltic pump 10a of the fluid supply module 13 operates. After the fluid passes through the fluid delivery module 14 and enters the first conduit B1, as the fluid pressure increases, the fluid gradually fills region P2 of the first conduit B1 and, eventually, region P2. At this point, the isolation medium originally in region P2 is compressed into region P1. Because regions P1 and P2 have a predetermined volume difference, the isolation medium is compressed from a first predetermined interval encompassing region P2 within a certain pressure range to a second predetermined interval, a certain distance from the non-flow-through pressure sensor 13a of the pressure detection module 11. The isolation medium is compressed within this pressure range and remains a certain distance from the non-flow-through pressure sensor 13a. This allows the non-flow-through pressure sensor 13a, located far from region P2, to detect changes in the isolation medium's pressure in real time.

[0077] After the peristaltic pump 10a stops working, the compressed isolation medium will press the fluid in the P2 area of ​​the first conduit B1 back into the delivery pipeline 111 in the fluid delivery module 14, thereby achieving non-contact intermittent continuous detection between the fluid and the non-circulating pressure sensor.

[0078] At the same time, the isolation medium pressure can be adjusted by controlling the fluid pressure, and the distance between the fluid and the non-circulating pressure sensor can be changed by changing the volume difference between the P1 area and the P2 area in the first conduit B1 to obtain high-precision sensor measurement results.

[0079] In this embodiment, the non-circulating pressure sensor 13a of the pressure detection module 11 is a non-circulating gauge pressure sensor. At this time, the non-circulating pressure sensor 13a detects the delivery pressure of the fluid in the fluid delivery module 14 by detecting the pressure of the isolation medium in the P1 area and does not directly contact the fluid, thereby avoiding the risk of cross-infection between multiple surgeries.

[0080] In this embodiment, a capacitive liquid level sensor 16a may be provided at a designated location in the P1 region and connected to the first conduit B1 via a clamp tube to provide an alarm for a fluid volume threshold. Specific implementation method three

[0082] The parts that are the same as those in the first embodiment will not be described again.

[0083] See also Figure 4Unlike the first embodiment, the fluid supply module 11 in this embodiment utilizes the fluid's own drainage pressure as a power source. Fluid typically flows from a relatively high pressure (e.g., the pressure within human tissue or a cavity) through a drainage device, partially flowing to the fluid delivery module 14. After being diverted by the diversion interface 151 of the liquid diversion module 15, a portion enters the pressure conversion module 10, and another portion flows through the drainage device's fluid delivery pipeline into a designated container. The pressure conversion module 10 includes two different diameters: a first conduit C1 and a second conduit C2. The inner diameter of the first conduit C1 is smaller than that of the second conduit C2, but the volume of the first conduit C1 is larger than that of the second conduit C2. After the fluid flows out of the body cavity, a portion flows into the first conduit C1 and gradually fills it. The isolation medium in the first conduit C1 is gradually compressed into the second conduit C2. Due to the volume difference between the first and second conduits C1 and C2, the isolation medium is compressed within a first predetermined range within a certain pressure range to a second predetermined range, a certain distance from the non-flow-through pressure sensor 13a of the pressure detection module 11. The isolation medium is compressed to generate pressure changes, so that the non-flow-through pressure sensor 13a at the distal end of the second conduit C2 can detect the pressure changes of the isolation medium in real time.

[0084] At the same time, the isolation medium pressure can be adjusted by controlling the fluid pressure, and the distance between the fluid and the non-circulating pressure sensor 13a can be changed by changing the volume difference between the first conduit C1 and the second conduit C2 to obtain high-precision sensor measurement results.

[0085] In this embodiment, to further reduce the risk of the non-flow-through pressure sensor in the pressure detection module 11 of the pressure measurement device 1 coming into contact with fluid and affecting its normal operation, a liquid level sensor 16a is provided between the second conduit C2 and the non-flow-through pressure sensor 13a. This liquid level sensor 16a can issue an alarm when the fluid volume reaches a specified position in the second conduit C2, thereby ensuring the reliability of the entire pressure detection device. A capacitive liquid level sensor 16a can be connected to the second conduit C2 via a clamp-type connection to provide an alarm when the fluid volume threshold is reached. Specific implementation method four

[0087] The parts that are the same as those in the first embodiment will not be described again.

[0088] See also Figure 5Unlike the first embodiment, the pressure conversion module 10 includes a first conduit D1, a four-way connector 12a, a second conduit D2, a third conduit D3, a fourth conduit D4, and a four-way connector 12b. The sum of the volumes of the first conduit D1, the second conduit D2, the third conduit D3, and the fourth conduit D4 is greater than the volume of the fifth conduit D5, resulting in a volume difference. The distal end of the fifth conduit D5 is connected to the pressure detection module 11. One end of the first conduit D1 is connected to one end 151a of the diversion interface 151 of the liquid diversion module 15, and the other end is connected to one end of the four-way connector 12a, so that the fluid is further diverted to the second conduit D2, the third conduit D3, and the fourth conduit D4. One end of the second conduit D2 and the four-way connector 12b is connected to the third conduit D3 and the fourth conduit D4, and the other end is connected to the end of the fifth conduit D5 away from the pressure detection module 14. The fluid is merged and enters the fifth conduit D5.

[0089] After the peristaltic pump is started, the fluid in the first conduit D1 enters the second conduit D2, the third conduit D3 and the fourth conduit D4 through the four-way connector 12a, and gradually fills the second conduit D2, the third conduit D3 and the fourth conduit D4. Then, the original isolation medium and / or part of the fluid in the second conduit D2, the third conduit D3 and the fourth conduit D4 will be compressed into the fifth conduit (10) through the four-way connector 12b. Since there is a predetermined volume difference between the sum of the volumes of the second conduit D2, the third conduit D3 and the fourth conduit D4 and the fifth conduit D5, the isolation medium will be compressed within a pressure range according to the volume change of the fluid, resulting in a volume change of the isolation medium, so that the isolation medium is compressed from the first predetermined interval within a certain pressure range to the second predetermined interval with a certain distance from the pressure detection module 11, thereby causing a pressure change. The isolation medium is compressed within a certain pressure range and is always at a certain distance from the non-circulation pressure sensor 7a. As a result, the non-circulation pressure sensor 13a at the far end of the third conduit A3 can detect the pressure change of the isolation medium in real time.

[0090] At the same time, the distance between the fluid and the non-flow-through pressure sensor 13a can be changed by changing the sum of the volumes of the second conduit D2, the third conduit D3 and the fourth conduit D4 and the volume difference of the fifth conduit A5 to obtain high-precision pressure measurement results.

[0091] In this embodiment, to further reduce the risk of contact between the non-flow-through pressure sensor in the pressure detection module 11 of the pressure measurement device 1 and the fluid, which could affect its normal operation, a liquid level sensor 16a is provided between the fifth conduit D5 and the non-flow-through pressure sensor 13a. This liquid level sensor 16a can issue an alarm when the fluid volume reaches a specified position in the fifth conduit D5, thereby ensuring the reliability of the entire pressure detection device. In this embodiment, a capacitive liquid level sensor 16a, connected to the third conduit A3 via a clamp-type tube, can be used to provide an alarm when the fluid volume threshold is reached.

[0092] Another embodiment of the present invention further provides a pressure detection method that can be implemented based on the pressure detection device disclosed in any of the above embodiments, thereby achieving non-contact intermittent continuous detection of fluid. Figure 6 , the pressure detection method comprises the following steps:

[0093] Step S1: receiving the fluid through the pipeline area;

[0094] Step S2: converting the pressure of the fluid into the pressure of the isolation medium, and detecting the pressure data of the isolation medium in real time;

[0095] Step S3: receiving the pressure data of the isolation medium, analyzing the fluid pressure according to a preset algorithm, and outputting the pressure result of the fluid.

[0096] Furthermore, the method may also include, before receiving the fluid, driving the fluid to flow based on the driving force provided by the fluid supply module; receiving the fluid through the fluid delivery module, and delivering the fluid to the pipeline area, receiving at least part of the fluid through the pipeline area, and utilizing the pressure of the fluid on the isolation medium to compress the isolation medium and thereby realize indirect detection of the fluid pressure.

[0097] Another embodiment of the present invention provides a medical device, comprising the pressure detection device of any embodiment, and having the same beneficial technical effects as the pressure detection device.

[0098] Those skilled in the art will appreciate that all or part of the steps of the various methods in the above embodiments may also be performed by programming related hardware. The above is a further detailed description of the present invention in conjunction with specific embodiments, and the specific implementation of the present invention is not limited to these descriptions. A person skilled in the art of the present invention may make several simple deductions or substitutions without departing from the concept of the present invention.

Claims

1. A pressure detection device, used for fluid pressure detection, characterized in that: The device comprises: a pressure conversion module, configured to receive the fluid through the pipeline area and convert the pressure of the fluid into the pressure of the isolation medium; A pressure detection module, provided at an end of the pressure conversion module away from the fluid, for detecting pressure data of the isolation medium in real time; The pressure analysis module is used to receive the pressure data of the isolation medium and analyze the fluid pressure according to a preset algorithm.

2. The pressure detection device according to claim 1, characterized in that: The pressure conversion module includes: a storage unit, configured to pre-store the isolation medium and receive at least part of the fluid provided by the fluid supply module; The state changing unit is configured to change the state of the isolation medium by causing the fluid to flow through the storage unit.

3. The pressure detection device according to claim 1, characterized in that: The pressure conversion module includes multiple connected pipeline areas, and there is a volume difference between the first pipeline area directly connected to the pressure detection module and one or more adjacent second pipeline areas. The multiple pipeline areas also include isolation media for maintaining fluid isolation.

4. The pressure detection device according to claim 2, characterized in that: The state changing unit includes: The medium compression subunit is configured to generate a force acting on the isolation medium by changing the volume of the fluid, and compress the isolation medium from a first predetermined interval of the storage unit to a second predetermined interval of the storage unit by the force.

5. The pressure detection device according to claim 1, characterized in that: The pressure conversion module further includes a pressure transmission unit configured to convert the pressure of the fluid into the pressure of the compressed isolation medium and transmit the pressure to the pressure detection module.

6. The pressure detection device according to claim 1, characterized in that: The pressure detection module includes at least one non-flow-through pressure sensor for collecting real-time pressure data of the isolation medium.

7. The pressure detection device according to claim 1, characterized in that: The device further comprises: A fluid supply module, configured to provide a driving force for the fluid to drive the fluid to flow; a fluid delivery module, connected to the fluid supply module, and configured to deliver the fluid through the fluid supply module; The flow diversion module is provided between the fluid delivery module and the pressure conversion module. The flow diversion module enables at least part of the fluid delivered by the fluid delivery module to be received by the pressure conversion module.

8. The pressure detection device according to claim 1, characterized in that: The device further comprises: an alarm module disposed between the pressure conversion module and the pressure detection module, wherein the alarm module comprises at least one liquid level sensor for issuing an alarm when detecting that the volume of the fluid in the pressure conversion unit exceeds a predetermined volume.

9. The pressure detection device according to any one of claims 1 to 8, characterized in that: The isolation medium is gas.

10. A pressure detection method, which can be implemented based on the pressure detection device according to any one of claims 1 to 9, characterized in that: The method comprises: receiving the fluid through a conduit region; Converting the pressure of the fluid into the pressure of the isolation medium and detecting the pressure data of the isolation medium in real time; The pressure data of the isolation medium is received, and the fluid pressure is analyzed according to a preset algorithm to output the pressure result of the fluid.

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