CN117122759B - Magnetic pressure monitoring device, extracorporeal circulation system and pressure measuring method - Google Patents
Magnetic pressure monitoring device, extracorporeal circulation system and pressure measuring method Download PDFInfo
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- CN117122759B CN117122759B CN202311150998.9A CN202311150998A CN117122759B CN 117122759 B CN117122759 B CN 117122759B CN 202311150998 A CN202311150998 A CN 202311150998A CN 117122759 B CN117122759 B CN 117122759B
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 50
- 230000004087 circulation Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title abstract description 14
- 238000009434 installation Methods 0.000 claims abstract description 86
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 239000008280 blood Substances 0.000 claims description 67
- 210000004369 blood Anatomy 0.000 claims description 66
- 239000007788 liquid Substances 0.000 claims description 36
- 239000002699 waste material Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 12
- 230000005389 magnetism Effects 0.000 description 10
- 230000036772 blood pressure Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000035487 diastolic blood pressure Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000035488 systolic blood pressure Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 208000007536 Thrombosis Diseases 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000001631 haemodialysis Methods 0.000 description 2
- 230000000322 hemodialysis Effects 0.000 description 2
- 238000000338 in vitro Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000007485 conventional hemodialysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1621—Constructional aspects thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/3621—Extra-corporeal blood circuits
- A61M1/3622—Extra-corporeal blood circuits with a cassette forming partially or totally the blood circuit
- A61M1/36224—Extra-corporeal blood circuits with a cassette forming partially or totally the blood circuit with sensing means or components thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/3621—Extra-corporeal blood circuits
- A61M1/3639—Blood pressure control, pressure transducers specially adapted therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2230/00—Measuring parameters of the user
- A61M2230/30—Blood pressure
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- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Hematology (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a magnetic pressure monitoring device, an extracorporeal circulation system and a pressure measuring method, wherein the pressure monitoring device comprises a first magnetic component for detecting the pressure of fluid circulation and a second magnetic component matched with the first magnetic component for transmitting detection signals, the first magnetic component comprises a flow pipe and a first installation shell, a pressure sensor with a detection end positioned in the flow pipe and a first magnetic connector electrically connected with the pressure sensor are arranged in the first installation shell, and the second magnetic component is provided with a second magnetic connector matched with the first magnetic connector.
Description
Technical Field
The invention relates to the technical field of in-vitro circulating blood pressure monitoring, in particular to a magnetic pressure monitoring device, an in-vitro circulating system and a pressure measuring method.
Background
In the conventional hemodialysis apparatus, in order to monitor the pressure of blood circulating in the blood circuit in an extracorporeal manner, a pressure monitoring device is generally used for monitoring, the pressure monitoring device comprises a housing connected to the blood circuit, a diaphragm is provided in the housing, the housing is divided into a liquid chamber and a gas chamber by the diaphragm, the diaphragm is a flexible membrane, the diaphragm can be displaced under the pressure of liquid, the internal pressure of the liquid circuit is transmitted to the gas chamber side through the elastic deformation of the diaphragm, the pressure of the liquid is indirectly obtained by detecting the pressure of the gas filled in the gas chamber by a pressure sensor provided in the host apparatus, and the detection value of the pressure sensor changes along with the change of the initial position of the diaphragm. However, the pressure measuring mode of the structure is to monitor the pressure of the gas in the gas chamber, then indirectly obtain the pressure of the liquid, and the stability and accuracy of the monitored pressure data cannot be effectively ensured with a certain delay. In addition, if the diaphragm is broken in this way, if the diaphragm member is broken, blood flows into the gas chamber, and the pressure monitoring circuit on the dialysis machine is contaminated with blood.
Disclosure of Invention
The technical purpose is that: aiming at the defects of the pressure monitoring of the extracorporeal circulation pipeline of the existing hemodialysis equipment, the invention discloses a magnetic pressure monitoring device, an extracorporeal circulation system and a pressure measuring method, wherein the magnetic pressure monitoring device can monitor the pressure in real time and ensure the monitoring accuracy.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme:
The utility model provides a formula pressure monitoring device is inhaled to magnetism, including being used for the fluid circulation to carry out the first magnetism of pressure detection and inhale the subassembly to and inhale the subassembly with first magnetism and inhale the cooperation of subassembly and carry out the second magnetism of detecting signal transmission, first magnetism is inhaled the subassembly and is included the runner pipe and first installation casing, be equipped with the pressure sensor that the detection end is located the runner pipe in the first installation casing and inhale the connector with the first magnetism of pressure sensor electricity connection, the second magnetism is inhaled the subassembly and is equipped with and inhale the connector with first magnetism and inhale the connector matched with second magnetism and inhale the connector through first magnetism and inhale the transmission that the connector carries out pressure sensor detection signal.
Preferably, the second magnetic component is provided with a second installation shell for installing the second magnetic connector, the lower part of the second installation shell is sleeved on the outer side of the first installation shell, and the inner side of the lower part of the second installation shell is provided with a limiting step matched with the end face of the first installation shell.
Preferably, the outer wall of the first installation shell and the assembly surface of the second installation shell are provided with convex ribs, and the inner wall of the second installation shell and the assembly surface of the first installation shell are provided with grooves which are matched with each other.
Preferably, an electromagnet and an iron block are arranged between the matching surfaces of the first installation shell and the second installation shell, the iron block is embedded on the first installation shell, the electromagnet is arranged on the second installation shell, and connection and disconnection between the first installation shell and the second installation shell are realized by controlling on-off of a circuit in the electromagnet.
Preferably, the first installation shell and the second installation shell are respectively provided with an installation cavity for installing the corresponding magnetic connector, the installation cavities are matched with the magnetic connector in shape, annular stop blocks for limiting the magnetic connector are arranged on the sides, close to each other, of the installation cavities, and the magnetic connector is installed on the side, away from the annular stop blocks, of the installation cavities.
Preferably, the flow pipe is provided with a mounting seat matched with the first mounting shell, the pressure sensor is arranged in the mounting seat, and the second mounting shell is provided with a fixing seat for integrally fixing the monitoring device at one side away from the first mounting shell.
Preferably, an installation groove matched with the pressure sensor is formed in the installation seat, a through hole communicated with the flow pipe is formed in the bottom of the installation groove, the detection end of the pressure sensor stretches into the through hole and is flush with the inner wall of the flow pipe, and the pressure of fluid in the flow pipe is monitored.
Preferably, the first mounting housing and the second mounting housing are relatively fixed by matching the attracting magnet arranged on the contact surface.
Preferably, concave-convex matching structures for mutual clamping are arranged on the contact surfaces between the first installation shell and the installation seat and between the second installation shell and the fixed seat.
Preferably, the wall of the flow tube of the present invention is provided with an elastic diaphragm at a position opposite to the pressure sensor.
Preferably, the first magnetic connector and the second magnetic connector are both 4PIN magnetic connectors, and the attractive force of the first magnetic connector and the second magnetic connector is 40N-60N.
The invention also discloses an extracorporeal circulation system, which uses the magnetic pressure monitoring device to monitor the pressure of the circulation system, wherein the extracorporeal circulation system comprises a circulation pipeline and a system host, the circulation pipeline comprises an arterial blood circuit, a filter and a venous blood circuit which are sequentially connected, the outlet end of the filter is connected with a waste liquid circuit, a blood pump is arranged on the arterial blood circuit, a waste liquid pump is arranged on the waste liquid circuit, pressure monitoring devices are arranged on the arterial blood circuit before the blood pump, the arterial blood circuit after the blood pump and the waste liquid circuit before the waste liquid pump, the pressure monitoring devices are respectively and electrically connected with the system host, and the pressure monitoring devices feed back detected pressure signals to the system host to control the operation of the circulation pipeline.
The invention provides a pressure measuring method based on the extracorporeal circulation system, which comprises the following steps:
S100, building a circulating pipeline, connecting a circulating pipe of the magnetic pressure monitoring device with other devices on the circulating pipeline, magnetically assembling the first magnetic assembly and the second magnetic assembly, electrifying a pressure sensor, starting a system host and performing self-inspection;
s200, collecting the pressure of the ambient gas through a pressure sensor and zeroing based on the pressure of the ambient gas;
S300, starting pre-filling the circulating pipeline, and displaying the pressure of the liquid in the circulating pipeline when the system host operates normally;
S400, after the circulating pipeline is precharged, the pressure of the system host is zeroed, the pressure value of the external environment is monitored through a second pressure sensor which is arranged in the system host and is always communicated with the external environment, the pressure sensor on the precharged circulating pipeline is calibrated through the pressure value of the external environment, the pressure of liquid in the circulating pipeline is monitored in real time through the pressure sensor, and the liquid pressure is fed back to the system host for display.
The beneficial effects are that: the magnetic pressure monitoring device, the extracorporeal circulation system and the pressure measuring method provided by the invention have the following beneficial effects:
1. The magnetic pressure monitoring device of the invention sets the detecting end of the pressure sensor in the flow tube, the blood pressure directly acts on the diaphragm of the pressure sensor, the detection of the blood pressure in the flow tube is realized, the pressure of the blood can be directly, accurately and stably monitored, the analog quantity is more stable, the precision is higher, and in addition, the real-time pressure waveform in the pipeline can be displayed.
2. The invention fixes the first magnetic component and the second magnetic component in a magnetic fixing mode, is simple and convenient to install, is convenient for building and assembling a circulation pipeline, can be used as disposable consumable materials by using the first magnetic component, can be repeatedly used by using the second magnetic component, saves cost, and can also avoid generating interactive infection.
3. The magnetic pressure monitoring device has the advantages that the problem of repeated calibration of the diaphragm pressure measuring structure caused by diaphragm fatigue or air leakage and the like is solved, the safety is good, and meanwhile, the magnetic pressure monitoring device only needs to perform atmosphere zeroing before and after pre-charging, so that the accuracy of a monitoring result is ensured.
4. The invention directly uses the pressure sensor to monitor the liquid pressure in the flow tube, can reduce the pre-charge amount and reduce the influence on the circulation capacity in the treatment process.
5. According to the invention, the first installation shell and the second installation shell are connected in a matched manner through the electromagnet and the iron block, and the separation between the first magnetic assembly and the second magnetic assembly can be realized rapidly by controlling the on-off of the electromagnet circuit, so that the pressure monitoring device is convenient to assemble and disassemble.
6. The signal of the pressure sensor is transmitted through the pin connection of the first magnetic connector and the second magnetic connector, and the signal wire does not need to be independently penetrated out.
7. According to the invention, the adsorption adhesion force is increased among the mounting seat, the fixing seat and the corresponding mounting shell through the adsorption magnet, and the position limitation is carried out through the clamping of the concave-convex matching structure, so that the stability of the structure during pressure measurement is ensured.
8. The elastic diaphragm is arranged on the side, opposite to the pressure sensor, of the flow pipe, so that the damage to equipment caused by too large fluctuation of monitoring pressure data can be prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a diagram of the overall structure of a monitoring device of the present invention;
FIG. 2 is an axial cross-sectional view of the monitoring device of the present invention along the flow tube;
FIG. 3 is a surface structure diagram of a second mounting housing of the present invention;
FIG. 4 is a block diagram of a first mounting housing of the present invention;
FIG. 5 is a schematic diagram of the extracorporeal circulation system according to the present invention;
FIG. 6 is a schematic diagram of a display interface for monitoring the pressure of a circulation pipeline according to the present invention;
FIG. 7 is a schematic view of a CFD simulation of fluid flow in a flow tube in accordance with the present invention;
FIG. 8 is a schematic diagram of the connection between the monitoring device and the external pipeline according to the present invention;
The device comprises a 1-flow tube, a 2-first mounting shell, a 3-pressure sensor, a 4-first magnetic connector, a 5-second magnetic connector, a 6-second mounting shell, a 7-limit step, an 8-electromagnet, a 9-iron block, a 10-mounting cavity, an 11-annular stop block, a 12-mounting seat, a 13-fixing seat, a 14-adsorption magnet, a 15-arterial blood circuit, a 16-blood pump, a 17-filter, a 18-venous blood circuit, a 19-waste liquid circuit, a 20-replacement liquid circuit, a 21-dialysate circuit, a 22-elastic membrane, a 23-groove, a 24-waste liquid pump, a 25-mounting groove, a 26-through hole and a 27-convex rib.
Description of the embodiments
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown, but in which the invention is not so limited.
As shown in fig. 1-4, the invention discloses a magnetic pressure monitoring device, which comprises a first magnetic component for detecting pressure of fluid circulation and a second magnetic component matched with the first magnetic component for transmitting detection signals, wherein the first magnetic component comprises a flow pipe 1 and a first installation shell 2, a pressure sensor 3 with a detection end positioned in the flow pipe 1 and a first magnetic connector 4 electrically connected with the pressure sensor 3 are arranged in the first installation shell 2, the second magnetic component is provided with a second magnetic connector 5 matched with the first magnetic connector 4, and the transmission of electric signals is detected by the pressure sensor 3 through the first magnetic connector 4 and the second magnetic connector 5. The first magnetic component and the second magnetic component are designed to be separable, and when the first magnetic component and the second magnetic component are close to each other, the first magnetic connector 3 and the second magnetic connector 5 are mutually attracted and electrically connected. The first magnetic component is integrally used as disposable consumable, two ends of the flow tube 1 are a blood inlet end and a blood outlet end respectively, the blood inlet end and the blood outlet end are integrated with an external pipeline respectively into a whole, and the blood inlet end and the blood outlet end are sleeved on the outer side of the external pipeline as outer tubes as shown in fig. 8.
The second magnetic assembly is provided with a second installation shell 6 for installing a second magnetic connector 5, the lower part of the second installation shell 6 is sleeved on the outer side of the first installation shell 2, the inner side of the lower part of the second installation shell 6 is provided with a limiting step 7 for being matched with the end face of the first installation shell 2, limiting is carried out between the first installation shell 2 and the second installation shell 6, in order to improve the reliability of structural matching, a convex rib or a buckling structure can be arranged between the side face of the first installation shell 2 and the matching face of the second installation shell 6, as shown in fig. 2, the outer wall of the first installation shell 2 and the assembling face which is positioned on the second installation shell 6 are provided with convex ribs 27, and the inner wall of the second installation shell 6 and the assembling face of the first installation shell 2 are provided with matched grooves 23. In order to further ensure that when the first magnetic connector 4 and the second magnetic connector 5 are connected, external liquid can be prevented from entering to cause short circuit and other conditions, a rubber pad is arranged between the contact surfaces of the first installation shell 2 and the second installation shell 6, sealing is ensured when the first magnetic component and the second magnetic component are magnetically attracted, and external liquid is prevented from entering the device. Specifically, the first magnetic connector 4 and the second magnetic connector 5 are both 4PIN magnetic connectors, the first magnetic connector 4 is a male connector, the second magnetic connector 5 is a female connector, the attractive force of the first magnetic connector 4 and the second magnetic connector 5 is 40N-60N, enough magnetic attractive force is guaranteed, and stability in the pressure monitoring process is guaranteed.
In the existing hemodialysis equipment, the pressure sensor arranged in the host equipment is used for detecting the pressure of gas filled in the gas chamber so as to indirectly obtain the pressure of liquid, the detection value of the pressure sensor changes along with the change of the initial position of the diaphragm, the pressure monitored by the structure is indirect pressure, the difference value between the monitored pressure and the actual pressure value can be 13-28mmHg, the situation that the diaphragm is damaged even is observed clinically, for example, the pressure after the diaphragm is 100mmHg, coagulation occurs in the diaphragm, high pressure can be generated, but the pressure monitored by an actual machine is still low, the machine does not alarm in a normal range, the pressure is finally increased continuously, the diaphragm is damaged, and the situation that the blood pollution occurs in a pressure monitoring loop on the host at the moment. In addition, when the diaphragm consumable leaves a factory, the elastic deformation of the diaphragm is consistent, otherwise, the accurate pressure cannot be tested by measuring the pressure through a table look-up method, and the process requirement is extremely high. The magnetic pressure monitoring device moves the pressure sensor arranged in the host device into the mounting seat 12 integrally formed with the runner pipe 1, so that the pressure sensor 3 is directly contacted with blood, and the pressure of the blood can be directly, accurately and stably monitored. In addition, the first magnetic component is directly magnetically attracted to the second magnetic component fixed on the system host through the magnetic attraction mode, so that the operation is simple and the installation is convenient. The existing diaphragm divides the shell into a blood cavity and a gas cavity, the blood cavity needs to be filled during prefilling, the prefilling amount is large, the contact surface between blood and foreign matters is increased, thrombus and dead space can be formed, and blood clots are deposited on the inner wall.
Preferably, in this embodiment, in order to maintain the stability of the overall structure of the device during monitoring, and facilitate the disassembly of the first magnetic component and the second component, an electromagnet 8 and an iron block 9 are disposed between the mating surfaces of the first installation housing 2 and the second installation housing 6, the iron block 9 is embedded in the first installation housing 2, the electromagnet 8 is disposed on the second installation housing 6, and the connection and disconnection between the first installation housing 2 and the second installation housing 6 are achieved by controlling the on-off of the circuit in the electromagnet 8, so that the acting force between the magnetic components is increased during use, and the disconnection can be performed quickly after the work is completed.
The first installation shell 2 and the second installation shell 6 are respectively provided with an installation cavity 10 for installing a corresponding magnetic connector, the installation cavities 10 are matched with the magnetic connector in shape, the installation cavities 10 are respectively provided with an annular stop block 11 for limiting the magnetic connector on the side close to each other, and the magnetic connector is installed from the side, deviating from the annular stop block 11, of the installation cavity 10, so that the detection device can be quickly assembled. During assembly, the first magnetic connector 4 and the second magnetic connector 5 can be respectively stuck in the mounting cavity 10 by using glue, so that the first magnetic connector 4 and the second magnetic connector 5 are prevented from falling off due to infirm adhesion during magnetic attraction. The data wire of the pressure sensor 3 is directly connected with the pin of the first magnetic connector 4, and the data wire of the pressure sensor 3 does not need to independently pass through the mounting cavity 10, so that the assembly process of the monitoring device is simplified.
The flow tube 1 is provided with the mounting seat 12 which is used for being matched with the first mounting shell 2, the pressure sensor 3 is arranged in the mounting seat 12, the mounting seat 12 is internally provided with the mounting groove 25 which is matched with the pressure sensor 3, the mounting groove 25 is provided with the through hole 26 which is communicated with the flow tube 1, the detection end of the pressure sensor 3 extends out of the through hole 26 which is arranged at the bottom of the mounting groove 25 and is level with the inner wall of the flow tube 1, and the blood pressure in the flow tube 1 directly acts on the membrane of the pressure sensor 3 to realize the detection of the blood pressure in the flow. As can be seen from the CFD simulation experiment of FIG. 7, the eddy currents are relatively serious in three places, namely the blood inlet end, the blood outlet end, the connecting end of the external pipeline and the end of the pressure sensor 3 extending into the flow tube 1. In this embodiment, in order to improve this situation, the ratio of the inner diameters of the blood inlet end and the blood outlet end to the inner diameter of the external connection pipeline is set to about 1.2 times, and the ends of the external connection pipeline, which are located at the blood inlet end and the blood outlet end, are all set to arc-shaped transition surfaces, so that the arc-shaped transition surfaces make smooth transition, and in addition, the detection end of the pressure sensor 3 extends out of the through hole 26 and is flush with the inner wall of the flow tube 1, so that the condition of liquid backflow in the flow tube 1 is greatly reduced, the flowing state of the liquid is further improved, and the aggregation of blood at the positions to form a flow field dead zone is avoided. During assembly, gel can be coated on the inner wall of the through hole, the outer peripheral wall of the detection port of the pressure sensor 3 is adhered to the inner wall of the through hole 26, so that the detection port of the pressure sensor 3 plugs the through hole 26, blood is sealed, and the blood is prevented from flowing out from a gap between the detection port of the pressure sensor 3 and the through hole 26, so that the pressure of the blood in the flow tube 1 cannot be accurately monitored. In addition, the elastic diaphragm 22 is arranged on the pipe wall of the flow pipe 1 at the position opposite to the pressure sensor 3, so that the corresponding measuring area of the sensor can be compatible with pressure abrupt change, and the monitored pressure data is prevented from fluctuating too much; the second installation casing 6 is equipped with the fixing base 13 that is used for carrying out monitoring devices overall fixation in one side that deviates from first installation casing 2, has seted up the mounting hole on the fixing base 13, is connected with the outer wall of system host computer through the mounting hole. The first mounting housing 2 and the second mounting housing 6 are relatively fixed by matching the attracting magnet 14 provided on the contact surface, and the assembly of the device is completed quickly, and in this embodiment, the attracting magnet 14 may be a sheet magnet or a ring magnet.
Concave-convex matching structures for mutual clamping are arranged on contact surfaces between the first installation shell 2 and the installation seat 12 and between the second installation shell 6 and the fixed seat 13, so that the relative positions are limited, and the assembly accuracy is ensured.
Preferably, in the present embodiment, a temperature sensor is further disposed in the flow tube 1, and the blood in the flow tube 1 is brought into contact with the temperature sensor to detect the temperature of the blood in the tube.
As shown in fig. 5, the present invention further discloses an extracorporeal circulation system, wherein the extracorporeal circulation system is monitored by using the magnetic pressure monitoring device, the extracorporeal circulation system comprises a circulation pipeline and a system host, the circulation pipeline comprises an arterial side blood circuit 15, a filter 17 and a venous side blood circuit 18 which are sequentially connected, the outlet end of the filter 17 is connected with a waste liquid circuit 19, the arterial side blood circuit 15 is provided with a blood pump 16, the waste liquid circuit 19 is provided with a waste liquid pump 24, one end of the arterial side blood circuit 15 is connected with an artery of a human body, the other end of the arterial side blood circuit 15 is connected with an inlet of the filter 17, one end of the venous side blood circuit 18 is connected with an outlet of the filter 17, the other end of the venous side blood circuit 18 is connected with a vein of the human body, the arterial side blood circuit 15 before the blood pump 16, the arterial side blood circuit 15 after the blood pump 16 and the waste liquid circuit 19 before the waste liquid pump 24 are respectively and electrically connected with each other, the pressure monitoring device monitors the blood pressure of the arterial side blood circuit 15 before the blood pump 16, and the pressure of the arterial side blood circuit 15 after the arterial side blood circuit 15 and the pressure monitoring device are respectively connected with the system host, and the pressure signal is fed back to the host through the pressure monitoring device, thereby the pressure monitoring device.
The invention provides a pressure measuring method based on the extracorporeal circulation system, which comprises the following steps:
S100, a circulating pipeline is built, a circulating pipe 1 of the magnetic pressure monitoring device is connected with other devices on the circulating pipeline, a first magnetic component and a second magnetic component are assembled in a magnetic way, a pressure sensor 3 is electrified, and a system host is started and self-inspected;
s200, collecting the pressure of the ambient gas through the pressure sensor 3 and zeroing based on the pressure of the ambient gas;
S300, starting pre-filling the circulating pipeline, and displaying the pressure of the liquid in the circulating pipeline when the system host operates normally;
S400, after the circulating pipeline is precharged, the pressure of the system host is zeroed, the pressure value of the external environment is monitored through a second pressure sensor which is arranged in the system host and is always communicated with the external environment, the pressure sensor 3 on the precharged circulating pipeline is calibrated through the pressure value of the external environment, the liquid pressure in the circulating pipeline 1 is monitored in real time through the pressure sensor 3, and the liquid pressure is fed back to the system host for display. According to the pressure measuring method, the pressure measurement is carried out only once before pre-charging and when the atmosphere is zeroed, the calibration is not needed repeatedly due to the fatigue of the diaphragm or the air leakage of the fastening device, and after the use is finished, the first magnetic component is directly discarded.
As shown in FIG. 6, the pressure monitoring device of the invention uses dual-channel invasive pressure monitoring, and the invasive blood pressure measuring method is to use fluid to guide the pressure of the part to be measured to an external pressure sensor, and then obtain relevant parameters such as systolic pressure, diastolic pressure, average pressure, pulse rate and the like through special signal processing and algorithm. The pressure measurements at three positions in total of the arterial blood circuit 15 and the waste liquid circuit 16 before and after the blood pump 16 can be displayed in real time during the test, and the measurement results at each position comprise the values of systolic pressure, diastolic pressure, average pressure and pulse rate. Taking one path as an example, fig. 6 shows IBP real-time pressure waveforms displayed by monitoring software, and in addition, measurement results, probe connection states and power states may be displayed. Wherein, the SYS systolic Pressure, DIA diastolic Pressure, MEAN average Pressure, PR pulse rate, pressure value corresponds to 10 times of average Pressure MEAN, -100 is representative invalid value, the picture shows that MEAN average Pressure is 130mmHg at this time (at this time the pump is stopped rotating, the pipeline is clamped by the solenoid valve). The magnetic pressure monitoring device is built on the blood purification pipeline, so that the actual pressure waveform in the pipeline can be displayed, the existing film type pressure measurement has hysteresis, only average pressure values can be obtained, but the actual pressure waveform cannot be displayed.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The magnetic pressure monitoring device is characterized by comprising a first magnetic component for detecting pressure of fluid circulation and a second magnetic component matched with the first magnetic component for transmitting detection signals, wherein the first magnetic component comprises a flow pipe (1) and a first installation shell (2), a pressure sensor (3) with a detection end positioned in the flow pipe (1) and a first magnetic connector (4) electrically connected with the pressure sensor (3) are arranged in the first installation shell (2), the second magnetic component is provided with a second magnetic connector (5) matched with the first magnetic connector (4), the second magnetic component is provided with a second installation shell (6) for installing the second magnetic connector (5), and the lower part of the second installation shell (6) is sleeved on the outer side of the first installation shell (2); the transmission of the detection electric signal of the pressure sensor (3) is carried out through the first magnetic connector (4) and the second magnetic connector (5);
The flow pipe (1) is provided with a mounting seat (12) which is matched with the first mounting shell (2), the pressure sensor (3) is arranged in the mounting seat (12), and a fixed seat (13) which is used for integrally fixing the monitoring device is arranged on one side, away from the first mounting shell (2), of the second mounting shell (6);
The mounting seat (12) is internally provided with a mounting groove (25) matched with the pressure sensor (3), the bottom of the mounting groove (25) is provided with a through hole (26) communicated with the flow pipe (1), the detection end of the pressure sensor (3) stretches into the through hole (26) and is flush with the inner wall of the flow pipe (1), and the fluid pressure in the flow pipe (1) is monitored.
2. A magnetic pressure monitoring device according to claim 1, characterized in that the inner side of the lower part of the second mounting housing (6) is provided with a limit step (7) for cooperation with the end face of the first mounting housing (2).
3. The magnetic pressure monitoring device according to claim 2, wherein the outer wall of the first installation shell (2) is provided with a convex rib (27) on the assembly surface of the second installation shell (6), and the inner wall of the second installation shell (6) is provided with a matched groove (23) on the assembly surface of the first installation shell (2).
4. The magnetic pressure monitoring device according to claim 2, wherein an electromagnet (8) and an iron block (9) are arranged between the matching surfaces of the first installation shell (2) and the second installation shell (6), the iron block (9) is embedded on the first installation shell (2), the electromagnet (8) is arranged on the second installation shell (6), and connection and disconnection between the first installation shell (2) and the second installation shell (6) are realized by controlling on-off of a circuit in the electromagnet (8).
5. The magnetic pressure monitoring device according to claim 2, wherein the first mounting housing (2) and the second mounting housing (6) are respectively provided with a mounting cavity (10) for mounting a corresponding magnetic connector, the shape of the mounting cavity (10) is matched with that of the magnetic connector, the mounting cavities (10) are respectively provided with an annular stop block (11) for limiting the magnetic connector on the side close to each other, and the magnetic connector is mounted on the side, deviating from the annular stop block (11), of the mounting cavity (10).
6. A magnetic pressure monitoring device according to claim 1, characterized in that the first mounting housing (2) and the second mounting housing (6) are fixed relatively by means of a magnet (14) arranged on the contact surface.
7. A magnetic pressure monitoring device according to claim 1, wherein concave-convex matching structures for mutual clamping are arranged on contact surfaces between the first installation shell (2) and the installation base (12) and between the second installation shell (6) and the fixing base (13).
8. A magnetically attractable pressure monitoring device according to claim 1, characterized in that the wall of the flow tube (1) is provided with an elastic membrane (22) at a position opposite the pressure sensor (3).
9. A magnetic pressure monitoring device according to claim 1, wherein: the first magnetic connector (4) and the second magnetic connector (5) are both 4PIN magnetic connectors, and the attractive force of the first magnetic connector (4) and the second magnetic connector (5) is 40N-60N.
10. An extracorporeal circulation system, which uses the magnetic pressure monitoring device of any one of claims 1-9 to monitor the pressure of the circulation system, and is characterized by comprising a circulation pipeline and a system host, wherein the circulation pipeline comprises an arterial blood loop (15), a filter (17) and a venous blood loop (18) which are sequentially connected, an outlet end of the filter (17) is connected with a waste liquid loop (19), a blood pump (16) is arranged on the arterial blood loop (15), a waste liquid pump (24) is arranged on the waste liquid loop (19), pressure monitoring devices are respectively arranged on the arterial blood loop (15) before the blood pump (16), the arterial blood loop (15) after the blood pump (16) and the waste liquid loop (19) before the waste liquid pump (24), the pressure monitoring devices are respectively electrically connected with the system host, and the pressure monitoring devices feed back detected pressure signals to the system host to control the operation of the circulation pipeline.
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| CN117122759A (en) | 2023-11-28 |
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