CN116649945A - Pressure detection device and sheath tube and perfusion suction system with same - Google Patents
Pressure detection device and sheath tube and perfusion suction system with same Download PDFInfo
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- CN116649945A CN116649945A CN202310718095.XA CN202310718095A CN116649945A CN 116649945 A CN116649945 A CN 116649945A CN 202310718095 A CN202310718095 A CN 202310718095A CN 116649945 A CN116649945 A CN 116649945A
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- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 16
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
-
- 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
- A61M1/71—Suction drainage systems
-
- 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
- A61M3/00—Medical syringes, e.g. enemata; Irrigators
- A61M3/02—Enemata; Irrigators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0247—Pressure sensors
Abstract
The invention provides a pressure detection device and a sheath tube and perfusion suction system comprising the same, wherein the pressure detection device comprises a shell and a pressure detection assembly, the shell is provided with a pressure measurement cavity and a mounting cavity, the pressure measurement cavity is provided with an air inlet communicated with a sheath tube pressure measurement interface and a vent hole communicated with the outside, and a switch is arranged at the vent hole; the pressure detection assembly is arranged in the installation cavity and comprises a gauge pressure sensor, a voltage adjusting circuit, an operational amplifier circuit and a conversion circuit, wherein the gauge pressure sensor, the voltage adjusting circuit, the operational amplifier circuit and the conversion circuit are electrically connected, and the gauge pressure sensor is used for converting pressure signals in the pressure measuring cavity into voltage signals.
Description
Technical Field
The invention relates to the field of sheath pipes, in particular to a sheath pipe device capable of measuring pressure and a micro-pressure sensor for the sheath pipe.
Background
In the conventional ureteroscope lithotripsy operation, the powder of stones and the haematuria in the renal pelvis can cause blurred vision, and the perfusion flushing liquid is required to keep clear vision, but meanwhile, the internal pressure of the renal pelvis can be obviously increased due to too fast perfusion and unsmooth backflow, so that infected urine, bacteria and endotoxin enter blood and lymphatic circulation, and fever, systemic inflammatory reaction syndrome and even fatal urologic sepsis are caused after the operation of a patient. In order to prevent serious infection caused by excessive renal pelvis pressure in soft-scope operation, the pressure in the renal pelvis needs to be controlled in a safe range in operation, and the perfusion speed and/or the negative pressure suction value needs to be adjusted in a feedback mode according to the pressure in the renal pelvis in operation, whether the adopted pressure measuring method can accurately measure the pressure in the renal pelvis in real time or not is a basic stone for ensuring that a pressure measuring and controlling system has good performance and safe operation.
The traditional pressure measurement mode has the following three modes: 1. the first pressure measuring mode measures pressure by installing pressure sensing on a perfusion pipeline, and physiological saline is monitored by a silica gel film, but the monitoring feedback is the perfusion pressure, and the monitoring of the intrarenal pressure is not the most direct. 2. The second pressure measuring mode is to monitor the intrarenal pressure directly through a sensor which is installed inside the main control unit and connected to the guiding sheath through a pipeline, so that the intrarenal pressure monitoring is realized. The monitoring is realized according to the height of the liquid level difference in the long pipeline, the intra-renal pressure is monitored and fed back, and the measuring range of the sensor is too large compared with the intra-renal pressure, so that the accuracy is not very high. 3. Thirdly, the pressure in the kidney is monitored by a sensor, the sensor is external, the measuring range is small, the sensor is connected to the guiding sheath by a pipeline, the pipeline is filled with liquid, and the pressure is monitored and fed back by pouring or sucking the liquid, but the monitoring is also faced with the condition that the pipeline is overlong, and the liquid level can influence the deviation of the pressure along with the position; all the three modes have the defects that the pipeline reaching the sensor from the interior of the renal pelvis, namely the pressure measuring cavity is overlong, the measurement error is large, and most importantly, the perfusion and suction system is large in size and more in pipeline cables, a doctor needs to operate a plurality of operations such as an endoscope, a host machine, suction and perfusion at the same time, the pressure measuring pipeline is inevitably collided by mistake, the pressure is suddenly changed due to the collision by mistake, and the pressure detection error is further caused. Therefore, the sensor is arranged on the perfusion pipeline, the perfusion host or the external device, and the technical problems are solved.
At present, a sensor is also arranged at the distal end of an endoscope or the distal end of a sheath tube directly, so that the pressure is directly monitored after the endoscope or the sheath tube enters a body cavity, the detection error of the renal pelvis is smaller when the mounting mode is directly positioned, however, in actual operation, the perfusion suction system is used for laser lithotripsy, the temperature generated in the laser lithotripsy process is too high, so that tissue is damaged, the perfusion suction cycle is needed to reduce the temperature in the body cavity, the constant temperature and the constant pressure are also kept, the instantaneous high pressure can be caused in the laser lithotripsy process, the instantaneous high pressure can not react with the real pressure in the cavity, 2-5S is generally needed for displaying the pressure value acquired from the sensor at present, the pressure in the cavity tends to be stable when the instantaneous high pressure is displayed, the pressure output value at the moment can not truly reflect the real pressure in the cavity, and the perfusion suction device is mistakenly controlled, so that the sensor is placed in the cavity, and the defects are more exist.
Disclosure of Invention
In a first aspect, the present invention provides a sheath with a pressure measurement function, the sheath includes a sheath body, a main channel extending from a proximal end to a distal end and a pressure measurement channel are provided in the sheath body, a connector is provided at the proximal end of the pressure measurement channel, the sheath further includes a pressure detection device, the pressure detection device includes:
The shell is provided with a pressure measuring cavity and an installation cavity, the pressure measuring cavity is provided with an air inlet used for being communicated with a sheath pressure measuring interface and a vent hole used for being communicated with the outside, and a switch is arranged at the vent hole;
the pressure detection assembly is arranged in the installation cavity and comprises a gauge pressure sensor, a voltage adjusting circuit, an operational amplifier circuit and a conversion circuit, wherein the gauge pressure sensor, the voltage adjusting circuit and the operational amplifier circuit are electrically connected with the conversion circuit, and the gauge pressure sensor is used for converting a pressure signal in the pressure measurement cavity into a voltage signal;
the voltage adjusting circuit is used for increasing the voltage difference of the voltage signal, and the operational amplifier circuit is used for amplifying the increased voltage difference in a multiplied way; the conversion circuit is used for converting the multiplied voltage signal into a pressure value;
an aerogel insulator, which is encapsulated on the surface of the pressure sensing component to transmit pressure.
In some embodiments, the gauge pressure sensor has an input voltage positive (+vin), an input voltage negative GND (-vin), an analog signal output voltage positive (+out), an analog signal output voltage negative (-out); the voltage regulating circuit at least comprises a first resistor (R1) and a second resistor (R3), wherein the first resistor (R1) is connected in parallel between an input voltage positive electrode (+vin) and an analog signal output voltage positive electrode (+out), and the first resistor (R3) is connected in parallel between an input voltage negative electrode GND (-vin) and an analog signal output voltage negative electrode (-out).
In some embodiments, the op-amp circuit is a GS8332 precision op-amp chip that amplifies the voltage difference by a factor of 100.
In some embodiments, the first resistor (R1) and the second resistor (R3) have a resistance of 100K.
In some embodiments, the conversion circuit is a single chip microcomputer stm32f103c8t6.
In some embodiments, the housing comprises:
the pressure measuring device comprises a base, wherein a pressure measuring pipe used for forming a pressure measuring cavity is arranged on the base, an air inlet is formed at one end of the pressure measuring pipe, an air vent is formed at the other end of the pressure measuring pipe, and an outlet is formed in the pressure measuring pipe and used for flowing out gas in the pressure measuring pipe;
the upper cover is arranged above the base;
the PCB is positioned in the base and fixed on the upper cover, the PCB integrates the pressure detection component and the control circuit, and the pressure detection component is arranged opposite to the outlet and is sealed by the aerogel insulating piece;
the control key is arranged on the shell and is in communication connection with the control circuit;
and the connecting cable is connected with the conversion circuit to output a pressure test value.
In a second aspect, the present invention provides a method for detecting a sheath device as described above, the method comprising the steps of:
The conversion stage comprises the steps that a gauge pressure sensor converts a pressure signal into a mu V-level voltage;
step 2) a voltage difference increasing stage, namely, a first resistor (R1) is connected in parallel between an input voltage positive electrode (+ vin) and an analog signal output voltage positive electrode (+ out), a second resistor (R3) is connected in parallel between an input voltage negative electrode GND (-vin) and an analog signal output voltage negative electrode (-out), the voltage difference is increased, and the mv level meets the minimum voltage difference requirement of an operational amplifier circuit;
step 3) amplifying the voltage difference by 100 times through an operational amplifier circuit to reach the V (volt) level; range (0.5-3.0V)
Step 4) a conversion stage, converting the voltage difference in the step 3) into a pressure value through a conversion circuit and outputting the pressure value;
step 5) acquisition phase: the gauge pressure sensor is collected for a plurality of times, and the singlechip removes extremum and averages the extremum to convert the extremum into a pressure value and output the pressure value.
In a third aspect, the present invention provides a pressure detection device employing the pressure detection device described above.
In a fourth aspect, the present invention provides an intelligent constant pressure regulated perfusion suction system comprising
In the sheath tube, an attraction channel is further formed in the sheath tube body;
an endoscope inserted in the sheath tube, the endoscope having a liquid feeding passage formed therein;
An irrigation device in communication with the fluid delivery channel for infusing an irrigation fluid into the body cavity;
the suction device is communicated with the suction channel and used for sucking out liquid in the human body cavity, and the perfusion device is matched with the suction device to keep the cavity at proper pressure;
the main control machine is in communication connection with the conversion circuit, the perfusion device and the suction device, and controls the flow and the pressure of the perfusion device and the suction device according to the pressure value output by the conversion circuit.
In some embodiments, the pressure detection assembly further comprises a control circuit connected with the master control to control the perfusion device and the suction device.
In a fifth aspect, the invention provides a constant pressure intelligent regulation and control method for a perfusion suction system, which comprises the following steps:
step 1) presetting a highest warning pressure value, a lowest warning pressure value, a pressure control value and a perfusion flow gear;
step 2) the main control machine controls the feeding of the perfusion device perfusion liquid and the suction of the suction device, and the intra-cavity pressure and the negative suction pressure are collected:
step 3) the pressure detection device collects the pressure in the cavity and transmits the pressure to the main control machine, the main control machine dynamically adjusts the pouring and suction states according to the pressure value monitored in real time and the data change trend of the pressure value, so that the pressure in the current cavity is balanced at a pressure control value, the pouring and suction balance states are realized, the pouring parameters comprise a pouring flow gear, and the suction parameters comprise the opening of a pressure release valve and a suction pressure threshold;
The main control machine voltage regulation mode comprises a coarse regulation mode, a fine regulation mode and a mixed regulation mode, wherein the coarse regulation mode aims at the extreme situation of the intra-cavity pressure, the fine regulation mode aims at the situation that the intra-cavity pressure deviates from a pressure control value by a small pressure difference, and the mixed regulation mode aims at the situation that the intra-cavity pressure does not reach the extreme situation and meanwhile deviates by a large value.
In some embodiments, the coarse mode is initiated when the pressure differential between the intra-cavity pressure and the pressure control value is at an extreme, e.g., in excess of ±20 mmHg; initiating a fine tuning mode when the differential pressure exceeds + -3 mmHg and is within + -8 mmHg; when the pressure difference is detected to exceed + -8 mmHg and to be within + -20 mmHg, the mixed regulation mode is initiated.
In some embodiments, the coarse adjustment mode includes the steps of controlling the suction pressure threshold to decrease the perfusion flow rate when the pressure value in the body cavity exceeds the highest warning line, controlling the suction pressure threshold to enable the suction flow rate to be greater than the perfusion flow rate, increasing the perfusion flow rate when the pressure difference in the cavity exceeds the lowest warning line, opening the pressure release valve, and adjusting the suction pressure threshold to a threshold value in a stable state, thereby achieving a rapid balance effect and enabling the pressure in the cavity to be separated from an extreme state as soon as possible.
In some embodiments, the fine pattern comprises the steps of: the priming gear is maintained in operation and the pressure relief valve is kept closed, pressure regulation being performed by fine tuning of the suction pressure threshold.
In some embodiments, when the pressure difference exceeds-3 mmHg and is within-8 mmHg, keeping the perfusion flow gear unchanged, keeping the pressure release valve closed, keeping the perfusion running currently, observing the change trend of the uploaded data, if the pressure difference is in an ascending phase, increasing the suction pressure threshold, if the pressure difference is in a descending phase, decreasing the suction pressure threshold and increasing the suction pressure threshold in a decreasing amplitude greater than that in the ascending phase, so that in the process of data adjustment, the suction pressure threshold is decreased in the whole, and the supercharging effect is achieved in a fine-tuning mode; when the pressure difference exceeds 3mmHg and is within 8mmHg, the current gear operation is maintained by perfusion, the change trend of the uploaded data is observed, if the pressure difference is in an ascending phase, the suction pressure threshold is increased, if the pressure difference is in a descending trend, the suction pressure threshold is reduced, the reduction amplitude is smaller than the reduction amplitude of the suction pressure threshold in the ascending phase, and in the process of data adjustment, the suction pressure threshold is increased as a whole, so that the pressure reduction effect is achieved.
In some embodiments, the hybrid adjustment mode includes the steps of: the perfusion flow fine adjustment, the pressure release valve fine adjustment and the suction pressure threshold fine adjustment are combined to jointly act on the intra-cavity pressure through the adjustment combination of the perfusion flow gear, the pressure release valve and the suction pressure threshold, so that the effect of increasing or reducing pressure is achieved.
In some embodiments, when the pressure difference is detected to be more than 8mmHg and within 20mmHg, the perfusion flow is appropriately reduced, the uploaded data change trend is observed, the suction pressure threshold is increased if in the rising phase, the suction pressure threshold is reduced and the reduced amplitude is smaller than the amplitude of the suction pressure threshold is increased in the rising phase if in the falling trend; in the process of data adjustment, the overall trend of increasing the suction pressure threshold value is that the decompression effect is achieved; when the pressure difference is detected to be lower than-8 mmHg and within-20 mmHg, the perfusion flow keeps the current operation, the pressure release valve is opened in a staged way, the change trend of the uploaded data is observed, if the pressure difference is in a rising stage, the suction pressure threshold value is increased, if the pressure difference is in a falling trend, the suction pressure threshold value is reduced, and the reduced amplitude is larger than the amplitude of the suction pressure threshold value in the rising stage; in the process of data adjustment, the whole device has the trend of reducing the suction pressure threshold value, so as to achieve the supercharging effect;
In some embodiments, the magnitude of the adjustment of the suction pressure threshold increases with increasing pressure differential of the intra-cavity pressure from the pressure control value.
According to the invention, the pressure detection device is arranged at the proximal end of the sheath tube, so that the problem of high overlong error of the traditional pressure detection pipeline is solved, and the sheath tube is positioned in the cavity in actual operation, so that a doctor cannot touch the sheath tube by mistake, and the pressure detection error caused by the doctor's mistake collision with the pressure measurement pipeline is avoided. Finally, the pressure detection device is placed at the proximal end of the sheath tube, so that the instantaneous high pressure caused by laser lithotripsy can not be detected, the detected stable pressure in the cavity is small in detection error, and the accuracy is high.
The sheath device provided by the invention has the advantages that the sheath and the pressure detection assembly are combined, the voltage signal is converted into a specific pressure value through the single chip microcomputer after passing through the voltage adjusting circuit and the operational amplifier circuit based on the relation between the voltage and the pressure of the gauge pressure sensor, so that the pressure in the cavity is monitored in real time, the detection precision is high, and the sensitivity is high.
Drawings
FIG. 1 is a schematic view of a sheath tube according to the present invention;
FIGS. 2-6 are schematic diagrams of the structure of the pressure detecting device according to the present invention;
FIG. 7 is a schematic diagram of the working principle of the pressure detecting device provided by the invention;
FIG. 8 is a schematic diagram of a pressure sensing assembly according to the present invention;
FIG. 9 is a schematic view of the structure of the sheath body according to the present invention;
FIG. 10 is a schematic diagram of a perfusion system according to the present invention;
FIG. 11 is a schematic circuit diagram of a gauge pressure sensor provided by the present invention;
FIG. 12 is a schematic diagram of a voltage adjusting circuit according to the present invention;
FIG. 13 is a schematic diagram of an operational amplifier circuit according to the present invention;
fig. 14-16 are process graphs of the regulation methods provided by the present invention.
Detailed Description
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "proximal," "distal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1-9, an embodiment of the present invention provides a sheath tube with a pressure measuring function, the sheath tube includes a sheath tube body 1 and a pressure detecting device, a main channel 11 extending from a proximal end to a distal end and a pressure measuring channel 12 are provided in the sheath tube body, the main channel 11 is used for down-feeding, pouring and sucking instruments, and an interface 121 is provided at a proximal end of the pressure measuring channel 12; the pressure detection device is assembled at the interface and used for detecting the pressure in the pressure measuring cavity, so that the pressure detection device is arranged at the proximal end of the sheath tube, the problem that the overlong error of the traditional pressure detection pipeline is high is solved, the sheath tube is positioned in the cavity in actual operation, and a doctor cannot touch the sheath tube by mistake, so that the pressure detection error caused by the doctor's mistake collision with the pressure measuring pipeline is avoided. In the embodiment, the pressure detection device is placed at the proximal end of the sheath tube, the instantaneous high pressure caused by laser lithotripsy can not be detected, the detected stable pressure in the cavity is low in detection error, and the accuracy is high. The existing pressure detection device has the technical problems of difficult assembly, inaccurate detection, large error and low sensitivity, and particularly aims at the technical problems that when a gauge pressure sensor detects the pressure in a renal pelvis, the pressure directly monitored is mu V-level voltage, if the pressure is directly amplified by an operational amplifier circuit, the mu V-level voltage is difficult to meet the amplification requirement of the operational amplifier circuit, and the voltage difference and the pressure are required to be increased in a same ratio in the amplification process. Based on this, the pressure detection device provided in this embodiment includes a housing 2, an aerogel insulator 3, and a pressure detection assembly 5, where the housing 2 has a pressure measurement cavity 21 and an installation cavity 20, the pressure measurement cavity 21 has an air inlet 22 for communicating with a sheath pressure measurement port and a vent hole 23 for communicating with the outside, and a switch is provided at the vent hole 23; the pressure detection assembly 5 is arranged in the mounting cavity 22, the pressure measurement cavity 21 is aligned with the pressure detection assembly 5 to form an outlet 210, the outlet 210 is sealed by the aerogel insulation member 3, and the aerogel insulation member 3 is used for transmitting the pressure of the pressure measurement cavity 21 to the pressure detection assembly 5.
As shown in fig. 7, the end of the vent hole 23A is connected with a switch, and the pressure detection device and the atmosphere can be conducted by opening for zeroing; the pressure can be measured when closed. The end of the air inlet 22B is connected with an interface 121 of the sheath body; after zero clearing, closing the switch at the end A, and when pressure is over at the end B, converting the pressure into a signal through the polycarbonate insulating gel and outputting the signal through the gauge pressure sensor; and opening a switch to conduct air and the air inlet, wherein the subsequently measured pressure is tested by taking the current pressure as a reference. Each sensor has certain difference, uses software for calibration, stores calibration data in the singlechip, and keeps the calibration data after power failure; each sensor only needs to be calibrated once.
The pressure detection assembly provided by the embodiment comprises a gauge pressure sensor, a voltage adjusting circuit, an operational amplifier circuit and a conversion circuit, wherein the gauge pressure sensor, the voltage adjusting circuit and the operational amplifier circuit are electrically connected with the conversion circuit, and the gauge pressure sensor is used for converting a pressure signal in a pressure measuring cavity into a voltage signal; the voltage adjusting circuit is used for increasing the voltage difference of the voltage signal, and the operational amplifier circuit is used for amplifying the increased voltage difference in a multiplied way; the conversion circuit is used for converting the multiplied voltage signal into a pressure value; . In the embodiment, the pressure, the voltage and the differential pressure are adjusted and amplified by a pull-up resistor, and finally the amplified pressure is further amplified by an operational amplifier circuit and transmitted to a singlechip for AD conversion, so that a specific acquired pressure value is obtained.
As shown in FIG. 11, the diagram is a detection circuit inside the gauge pressure sensor, and the main function of the part is to convert a pressure signal into a voltage signal with a conversion relationship of 5 μV/V/mmHg. If the signal is directly acquired by using 12-bit AD conversion, the signal needs to be amplified because the voltage difference formed by the voltage and the pressure is too small to be directly amplified. The 12-bit AD acquisition precision of the singlechip is 3.3V/4096=8.056 mV; is much greater than the pressure versus voltage relationship of the gauge pressure sensor (5 μV/V/mmHg). Therefore, the voltage difference between the positive electrode v+ of the analog signal output terminal and the negative electrode V-of the analog signal output terminal is increased in the present embodiment, and the linear relationship between the voltage and the pressure needs to be maintained.
The gauge pressure sensor is provided with an input end voltage positive electrode (+vin), an input voltage negative electrode GND (-vin), an analog signal output voltage positive electrode (+out) and an analog signal output voltage negative electrode (-out); as shown in fig. 12, the voltage adjusting circuit includes a first resistor (R1) and a second resistor (R3), the first resistor (R1) is connected in parallel between the input voltage positive electrode (+vin) and the analog signal output voltage positive electrode (+out), R1 is added between v+ and VDD6V, the resistor is connected in parallel with a pull-up resistor inside the sensor, after the resistor is connected in parallel, the resistor is reduced, and the voltage of v+ is greater than the output voltage v+ of the sensor; the first resistor (R2) is connected in parallel between an input voltage negative electrode GND (-vin) and an analog signal output voltage negative electrode (-out), R3 is added between V-and GND and is connected in parallel with a pull-down resistor in the sensor, and then the voltage of V-is smaller than the voltage of the sensor V. The voltage difference between V + and V-is increased by the partial circuit to prepare for the next operation.
As shown in fig. 13, in order to maintain the linear relationship between the sensor pressure and the voltage, the voltage difference was amplified 100 times by using a GS8332 precision op-amp chip.
Optionally, the operational amplifier circuit is a GS8332 precision operational amplifier chip, and amplifies the voltage difference by 100 times. The resistance value of the first resistor (R1) and the second resistor (R3) is 100K. The conversion circuit is a singlechip stm32f103c8t6
The detection method of the invention comprises the following steps:
step 1) a conversion stage, namely converting the pressure signal into mu V-level voltage by the gauge pressure sensor.
Step 2) a voltage difference increasing stage, namely, a first resistor (R1) is connected in parallel between an input voltage positive electrode (+ vin) and an analog signal output voltage positive electrode (+ out), a second resistor (R3) is connected in parallel between an input voltage negative electrode GND (-vin) and an analog signal output voltage negative electrode (-out), so that the voltage difference is increased, and the minimum voltage difference requirement of an operational amplifier circuit is met;
step 3) amplifying the voltage difference by 100 times through an operational amplifier circuit to reach the V (volt) level;
step 4) a conversion stage, converting the voltage difference in the step 4) into a pressure value through a conversion circuit and outputting the pressure value;
step 5) acquisition phase: the gauge pressure sensor is collected for a plurality of times, and the singlechip removes extremum and averages the extremum to convert the extremum into a pressure value and output the pressure value.
By way of example only, and in an illustrative,
a first part:
referring to fig. 11, the voltage at the positions of the positive electrode v+ of the analog signal output terminal and the negative electrode V-of the analog signal output terminal are all 10k, R7, R4, R6, R7, R10 are VOUT, and VOUT = (v+/2) - (V-) is obtained according to the op-amp formula VOUT- (v+/2) = (v+) - (V-), so that the function of this part is to calculate the voltage difference between the positive electrode v+ of the analog signal output terminal and the negative electrode V- "of the analog signal output terminal.
A second part:
referring to fig. 12, r9=1k, r8=100deg.K, the voltage difference of v+ and V-is amplified mainly by the two resistors, the amplification factor of the voltage difference is 100 times according to the relation between R8 and R9, the final output voltage range is 0.5V-3.0V, and the AD acquisition range of stm32f103c8t6 is satisfied.
Compared with the prior art, the pressure detection device provided by the invention has the beneficial effects that: 1. the sensor calibration data may be saved. 2. The calibration accuracy can be adjusted (by controlling the pull-up and pull-down resistors). 3. The analog signals are converted into digital signals and are sent by the singlechip through the serial port upper computer, so that the compatibility of the sensor is improved. 4. The sensor module is independent, and can be suitable for being used in more scenes.
In this embodiment, the housing includes a base 3, an upper cover 4, a PCB board 5, control keys 6, and a connection cable 7; the base 1 is provided with a pressure measuring tube 21 for forming a pressure measuring cavity, one end of the pressure measuring tube 21 is provided with an air inlet 22, the other end of the pressure measuring tube is provided with a vent hole 23, and the pressure measuring tube 21 is provided with an outlet 210 for the outflow of gas in the pressure measuring tube; the upper cover 4 is arranged above the base; the PCB 5 is positioned in the base and fixed on the upper cover, integrates a pressure detection component and a control circuit, and is arranged opposite to the outlet 210 and sealed by the aerogel insulator 3; the control key is arranged on the shell and is in communication connection with the control circuit; the connection cable 7 is connected with the conversion circuit for outputting the pressure test value, the connection cable having an air connection 71.
Specifically, the PCB board, the pressure detecting assembly and the control circuit are installed in the housing 50, and a through hole is formed in the housing, the through hole is sealed by the polycarbonate insulating gel, and the through hole is disposed opposite to the outlet 210.
In some embodiments, the pressure detection assembly further comprises a control circuit connected with the master control to control the perfusion device and the suction device.
The sheath device provided by the invention has the advantages that the sheath and the pressure detection assembly are combined, the voltage signal is converted into a specific pressure value through AD conversion after passing through the voltage adjusting circuit and the operational amplifier circuit based on the relation between the voltage and the pressure of the gauge pressure sensor, the pressure deviation caused by a long pipeline is avoided, and the real-time monitoring of the pressure in the cavity is finally realized.
Example 2
Referring to fig. 10, the present embodiment provides an intelligent constant-pressure regulating perfusion suction system, which includes a sheath tube, an endoscope 8, a perfusion device, a suction device and a main control unit 100 according to embodiment 1, wherein the sheath tube further has a suction channel, and in this embodiment, the suction channel and the main channel are the same channel; the endoscope 8 is inserted into the sheath tube, and a liquid delivery channel is formed in the endoscope 8; the perfusion device 10 is in communication with the fluid delivery channel for injecting a perfusion fluid into the body cavity;
The suction device is used for sucking the waste liquid and the stones in the cavity through the sheath tube by negative pressure of the host machine, the waste liquid and the stones are collected into the collector through the negative pressure suction tubes 2 and 1, and the perfusion device is matched with the suction device to keep the cavity at proper pressure.
The filling device comprises a liquid inlet pipe 101, a liquid storage tank 102 and a filling pump, wherein the filling pump 103 is connected with a liquid storage bag through the liquid inlet pipe 101; the perfusion pump 103 is communicated with the 8 liquid feeding channel of the endoscope through the liquid outlet pipe 103;
the suction device comprises a suction pump, a first negative pressure suction pipe 91, a suction container 93, a second negative pressure suction pipe 92 and a pressure sensor, wherein one end of the first negative pressure suction pipe 91 is connected with the outer sheath pipe 1, the other end of the first negative pressure suction pipe is connected with the suction container 93, one end of the second negative pressure suction pipe 92 is connected with the suction container 93, the other end of the second negative pressure suction pipe is connected with the suction pump, the pressure sensor is used for detecting the intra-cavity pressure in the suction container 93, and the suction container 93 is provided with a pressure relief valve.
The main control machine 100 is in communication connection with the conversion circuit, the perfusion device and the suction device, and the main control machine controls the flow and the pressure of the perfusion device and the suction device according to the pressure value output by the conversion circuit.
The pressure detection device provided in this embodiment is further provided with a control circuit, the control circuit is connected with the main control computer 100 through the cable connector 71, the singlechip transmits the pressure value to the main control computer, and the main control computer adjusts the flow and the pressure of the perfusion device and the suction device according to the pressure output value so as to adjust the pressure in the cavity.
The system further includes a display capable of displaying the pressure output value.
In one embodiment of the invention, the invention provides a constant-pressure intelligent regulation method, which comprises the following steps:
the pressure of the pressure detection device is output to a main control machine, the main control machine compares the pressure with a preset ideal pressure, and if the pressure does not meet the ideal pressure requirement, parameters of perfusion attraction, proportional pressure, temperature and flow are controlled by the main control machine;
and 2) the pressure detection device is provided with a control key, and the control key can be used for directly controlling the perfusion device and the suction device to regulate and control the pressure in the body cavity.
In a preferred embodiment of the invention, the suction device further comprises a pressure sensor for detecting the intra-cavity pressure in the suction container 93, said suction container 93 being provided with a pressure relief valve.
The main control computer controls the change of the suction pressure threshold, when the pressure of the suction container 93 is larger than the suction pressure threshold, the suction pump is stopped, when the pressure of the suction container is smaller than the suction pressure threshold and the current cavity pressure is larger than the pressure control value-3 mmHg, the suction pump is started, the pressure of the suction container is adjusted through the change of the suction pressure threshold, the suction flow is different due to the difference of the pressure of the suction container, and a certain pressure is maintained in the cavity to achieve the dynamic balance of the suction and the perfusion through the adjustment of the suction flow and the perfusion flow.
The main control computer further presets a highest warning pressure value, a lowest warning pressure value, a pressure control value and a perfusion flow gear, wherein the pressure control value refers to an ideal pressure value or a pressure interval in a preset cavity, the warning pressure value refers to a state that the pressure difference between the pressure in the cavity and the pressure control value exceeds the value, the pressure detection device detects the pressure in the cavity every 0.25s, when the pressure in the cavity is not in the pressure control value + -8 mmHg, the pressure ratio is excessively high or excessively low at the moment, and the pressure difference is excessively high, and the pressure needs to be adjusted in a large range in a rough adjustment mode, for example, the pressure in the cavity is quickly adjusted to be close to or reach the pressure control value through adjustment of the perfusion gear and the pressure release valve. However, when the pressure in the cavity is in the pressure control value + -8 mmHg, the pressure difference between the pressure in the cavity and the pressure control value is small, if the pressure in the cavity is continuously regulated through rough adjustment, such as a filling gear or a pressure release valve, the pressure in the cavity is easily led to go to the other extreme, and the control value is difficult to reach or approach. In addition, the suction pressure of the suction pump of the suction device is large, and if the pressure is directly regulated by the suction pump, the effect of fine adjustment is difficult to achieve, so that the pressure threshold value of the suction container is finely adjusted; in summary, the present invention aims to obtain dynamic pressure balance in a cavity, and maintain the pressure in the cavity in a dynamic balance state of a pressure control value through combination of rough adjustment and fine adjustment.
The invention provides a constant pressure regulation and control method of a perfusion suction system, which comprises the following steps:
step 1) presetting a highest warning pressure value, a lowest warning pressure value, a pressure control value and a perfusion flow gear;
step 2) the main control machine controls the feeding of the perfusion device perfusion liquid and the suction of the suction device, and the intra-cavity pressure and the negative suction pressure are collected:
step 3) the pressure detection device collects the pressure in the cavity and transmits the pressure to the main control machine, and the main control machine automatically adjusts a corresponding state system according to the pressure value monitored in real time and the data change trend of the pressure value so that the current pressure in the cavity is balanced at a pressure control value; when the data exceeds the standard, the system can automatically adjust the self-perfusion and suction state, and the state of equilibrium of perfusion and suction is reached as soon as possible under the state of maintaining a certain intra-cavity pressure; the perfusion parameters comprise a perfusion flow gear, and the suction parameters comprise opening of a pressure release valve and a suction pressure threshold;
the main control machine voltage regulation mode comprises a coarse regulation mode, a fine regulation mode and a mixed regulation mode, wherein the coarse regulation mode is in an extreme condition aiming at the intra-cavity pressure, and the fine regulation mode is smaller in pressure difference aiming at the intra-cavity pressure deviating from a pressure control value. The mixed regulation mode starts a coarse regulation mode for the situation that the pressure in the cavity does not reach the extreme condition and the deviation value is large, for example, the pressure difference between the pressure in the cavity and the pressure control value is in the extreme condition, for example, exceeds +/-20 mmHg; initiating a fine tuning mode when the differential pressure exceeds + -3 mmHg and is within + -8 mmHg; when the pressure difference is detected to exceed + -8 mmHg and to be within + -20 mmHg, the mixed regulation mode is initiated.
The pressure control value may be a point value or an interval value. In some embodiments of the present invention, referring to fig. 14-16, the pressure control value is 10mmHg, and the pressure regulating process is started when the pressure difference between the intra-cavity pressure and the pressure control value is within ±3 mmHg.
Referring to fig. 14, it is detected that the pressure value in the cavity exceeds the highest warning line, i.e. the pressure difference between the pressure in the cavity and the pressure control value is in an extreme condition, for example, greater than 20mmHg, the main control unit controls to reduce the perfusion flow gear, controls the suction pressure threshold value to enable the suction flow to be greater than the perfusion flow, when the pressure difference in the cavity exceeds the lowest warning line, adjusts the perfusion flow gear to the maximum, opens the pressure release valve, and adjusts the suction pressure threshold value to a threshold value in a stable state, thereby achieving a rapid balance effect and enabling the device to be separated from the current state as soon as possible. The system response is quickened, the static difference is reduced, but the overshoot of the adjusting mode is increased, and the stability is poor; in this embodiment, the filling process gear is adjusted to the lowest gear or the highest gear to accelerate pressure callback, and meanwhile, in order to avoid overlarge adjustment range of pressure, the suction pressure threshold is adjusted to a suction pressure threshold in a stable state, wherein the suction pressure threshold in the stable state refers to a corresponding suction pressure threshold when the intra-cavity pressure recorded by the main control computer reaches a pressure control value interval.
Referring to fig. 15, when the pressure difference is detected to exceed ±3mmHg and fall within ±8mmHg, it is indicated that the pressure difference of the pressure in the cavity is not large, in order to maintain the perfusion requirement in operation, the perfusion flow is kept unchanged, the suction pressure threshold is controlled to dynamically balance the perfusion, and the pressure in the body is controlled to be at the "pressure control value", which does not require to adjust the perfusion, or the pressure relief valve is opened. As both of these adjustment modes cause large fluctuations in the data. The current dynamic balance is also easily disrupted. Therefore, at this stage, the fine-tuning mode of the system needs to be activated, the priming gear is kept running, and the pressure relief valve is kept closed, pressure adjustment is performed by fine-tuning the suction pressure threshold. In addition, in the perfusion suction process, pipelines in the cavity are more, pressure fluctuation is larger, the frequency of pressure detection is faster, and the setting of the suction pressure threshold value also needs to be adjusted in real time according to the change trend of data. In one embodiment of the invention, when the pressure difference exceeds-3 mmHg and is within-8 mmHg, the perfusion flow gear is kept unchanged, the pressure release valve is kept closed, the perfusion keeps running currently, the uploaded data change trend is observed, if the pressure difference is in an ascending stage, the suction pressure threshold value is increased, and if the pressure difference is in a descending stage, the suction pressure threshold value is reduced, and the reduction amplitude is larger than the increase amplitude of the suction pressure threshold value in the ascending stage, so that the pressure boosting effect is achieved in a fine tuning mode because the overall tendency of reducing the suction pressure threshold value exists in the data adjustment process. When the pressure difference exceeds 3mmHg and is within 8mmHg, the perfusion maintains the current gear to operate, the change trend of the uploaded data is observed, if the pressure difference is in the ascending stage, the suction pressure threshold value is increased, and if the pressure difference is in the descending trend, the suction pressure threshold value is reduced, and the reduction amplitude is smaller than the amplitude of the suction pressure threshold value in the ascending stage. In the process of data adjustment, the overall trend of the method is to increase the suction pressure threshold value, so that the decompression effect is achieved. Judging the current pressure detection value state and the data change trend, adjusting the suction pressure threshold value to be in a rising or falling trend, and reducing the damage of the pressure fluctuation to the body cavity.
In some embodiments of the invention, when the pressure difference is detected to exceed plus or minus 8mmHg and is within plus or minus 20mmHg, the perfusion flow fine adjustment, the pressure relief valve fine adjustment and the fine adjustment of the suction pressure threshold are combined to jointly act on the intra-cavity pressure through the adjustment of the perfusion flow gear, the pressure relief valve fine adjustment and the suction pressure threshold, so as to achieve the effect of increasing or reducing pressure, in particular, when the pressure difference is detected to exceed 8mmHg and is within 20mmHg, the perfusion flow gear is reduced, the uploaded data change trend is observed, the suction pressure threshold is increased if the data change trend is in an ascending phase, and the suction pressure threshold is reduced if the data change trend is in a descending phase, and the reduced amplitude is smaller than the amplitude of the suction pressure threshold in the ascending phase; in the process of data adjustment, the overall trend of increasing the suction pressure threshold value is that the decompression effect is achieved; when the pressure difference is detected to exceed-8 mmHg and be within-20 mmHg, the perfusion flow keeps running currently, the pressure release valve is opened in a staged way, the change trend of the uploaded data is observed, if the pressure difference is in a rising stage, the suction pressure threshold value is increased, if the pressure difference is in a falling trend, the suction pressure threshold value is reduced, and the reduced amplitude is larger than the amplitude of the suction pressure threshold value in the rising stage; in the process of data adjustment, the whole device has the trend of reducing the suction pressure threshold value, so that the supercharging effect is achieved; in this embodiment, the adjustment amplitude of the suction pressure threshold increases with the increase of the pressure difference between the intra-cavity pressure and the pressure control value, so that the combination of coarse adjustment and fine adjustment is realized through the amplitude of the suction pressure threshold, so that the intra-cavity pressure quickly reaches the pressure control value, and the tissue damage caused by the overlarge pressure fluctuation in the body is avoided.
Illustratively, the relationship between the suction flow rate of negative pressure (unit: ml/min) corresponding to the suction pressure threshold value and the relationship are counted and classified into 12 types. The values are respectively-5 mmhg, -10mmhg, -15mmhg, -20mmhg, -25mmhg, -30mmhg, -35mmhg, -40mmhg, -45mmhg, -50mmhg, -60mmhg and-70 mmhg, and the values are generally used for default initial values of the system when the system is started, and the values of balance points can be updated along with the dynamic balance process in the later period, so that the dynamic balance effect is achieved.
The pressure difference Pa (unit: mmhg) between the pressure in the cavity and the pressure control value is counted and then classified, and the pressure in the cavity is in the following 13 states, namely, 1: >20,2:15< pa < = 20,3:10< pa < = 15,4:8< pa < = 10,5:5< pa < = 8,6:3< pa < = 5,7: -3< pa < = 3,8: -5< pa < = -3,9: -8< pa < = -5, 10: -10< pa < = -8, 11: -15< pa < = -10, 12: -20< pa < = -15 13: -20< Pa.
And comparing the newly collected pressure data in the cavity with the historical data according to the statistical classification, so as to quickly achieve the dynamic balance of the filling and the suction by adjusting the filling, the suction and the pressure release valve according to the change trend of the historical data.
According to the pressure difference Pa (unit: mmhg) between the pressure in the cavity and the pressure control value, the following treatment mode is provided in this embodiment:
1. (Pa > 20): pouring the current gear-4, increasing suction pressure, and reinforcing suction flow according to the negative pressure suction flow corresponding to the counted suction pressure threshold value, so that suction flow is greater than pouring flow; and observing the change trend of the uploaded data, if the data continuously rises, adjusting the perfusion to the lowest gear, adjusting the suction pressure threshold to the threshold of the balance state until the current intra-cavity pressure is recovered to the pressure control value, and recovering the perfusion flow. If the pressure is continuously reduced according to the changing requirement, the perfusion flow is regulated, and the suction pressure threshold is increased so as to achieve the pressure reducing effect;
2. (15 < pa < = 20): and (3) pouring the current gear-3, observing the change trend of the uploaded data, if the current gear-3 is in an ascending stage, increasing the suction pressure threshold value +5, and if the current gear-3 is in a descending trend, decreasing the suction pressure threshold value-2. In this way, in the process of data adjustment, the whole has the tendency of increasing the suction pressure threshold value; the decompression effect is achieved;
3. (10 < pa < = 15): and (3) pouring the current gear-2, observing the change trend of the uploaded data, if the current gear-2 is in an ascending stage, increasing the suction pressure threshold value +5, and if the current gear-2 is in a descending trend, decreasing the suction pressure threshold value-3. Thus, there is a tendency for the "suction pressure threshold" to increase overall during data adjustment. The decompression effect is achieved;
4. (8 < pa < = 10): and (3) pouring the current gear-1, observing the change trend of the uploaded data, if the current gear-1 is in an ascending stage, increasing the suction pressure threshold +4, and if the current gear-1 is in a descending trend, decreasing the suction pressure threshold-1. Thus, there is a tendency for the "suction pressure threshold" to increase overall during data adjustment. The decompression effect is achieved;
5. (5 < pa < =8): and (3) maintaining the current operation of perfusion, observing the change trend of the uploaded data, increasing the suction pressure threshold value +3 if the current operation is in an ascending stage, and reducing the suction pressure threshold value-1 if the current operation is in a descending stage. Thus, there is a tendency for the "suction pressure threshold" to increase overall during data adjustment. The decompression effect is achieved;
6. (3 < pa < =5): and observing the change trend of the uploaded data, if the data is in the ascending stage, increasing the suction pressure threshold value +2, and if the data is in the descending trend, decreasing the suction pressure threshold value-1. Thus, there is a tendency for the "suction pressure threshold" to increase overall during data adjustment. The decompression effect is achieved;
7. (-3 < pa < =3): and (3) keeping the current state, timing, recording data, recording the current suction pressure threshold (namely, the suction pressure threshold corresponding to the stable state) when a certain time is reached, and updating in real time. When the state is destroyed, the timing is repeated, the saved value can be used in the process of dynamic adjustment, and the value is used when the balance state is quickly restored;
8. (-5 < pa < = -3): and (3) maintaining the current operation of perfusion, observing the change trend of the uploaded data, increasing the suction pressure threshold value +1 if the current operation is in an ascending stage, and reducing the suction pressure threshold value-2 if the current operation is in a descending stage. Thus, there is a tendency for the "suction pressure threshold" to decrease overall during data adjustment. The supercharging effect is achieved;
9. (-8 < pa < = -5): and (3) maintaining the current operation of perfusion, observing the change trend of the uploaded data, increasing the suction pressure threshold value +1 if the current operation is in an ascending stage, and reducing the suction pressure threshold value-3 if the current operation is in a descending stage. Thus, there is a tendency for the "suction pressure threshold" to decrease overall during data adjustment. The supercharging effect is achieved;
10. (-10 < pa < = -8): and (3) maintaining the current operation of the perfusion, opening the pressure release valve in a staged manner, observing the change trend of the uploaded data, increasing the suction pressure threshold value +1 if the current operation is in an ascending stage, and reducing the suction pressure threshold value-4 if the current operation is in a descending trend. Thus, there is a tendency for the "suction pressure threshold" to decrease overall during data adjustment. The supercharging effect is achieved;
11. (-15 < pa < = -10): and (3) maintaining the current operation of the perfusion, opening the pressure release valve in a staged manner, observing the change trend of the uploaded data, increasing the suction pressure threshold value +3 if the current operation is in an ascending stage, and reducing the suction pressure threshold value-5 if the current operation is in a descending trend. The overall tendency is to lower the "suction pressure threshold". The supercharging effect is achieved;
12. (-20 < pa < = -15): pouring the current gear +3 to run, opening a pressure release valve, and setting a suction pressure threshold value "
Is adjusted to a threshold value in a steady state. And observing the change trend of the uploaded data, if the data is in an ascending stage, increasing the suction pressure threshold value +2, and if the data is in a descending trend, decreasing the suction pressure threshold value-5. Thus, there is a tendency for the "suction pressure threshold" to decrease overall during data adjustment. The supercharging effect is achieved;
13. and (Pa < -20) pouring the current gear +4 for operation, opening a pressure release valve, and adjusting the suction pressure threshold to a threshold value under a stable state, so as to achieve the effect of quick balance and enable the equipment to be separated from the current state as soon as possible.
As described above, by analyzing the historical data, the pressure value, the pressure control value, and the pressure threshold value in the cavity are analyzed, so that the perfusion flow rate and the suction flow rate are dynamically adjusted to achieve the balance of the pressure in the cavity.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "a particular embodiment," "alternative embodiments," "examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The sheath tube with the pressure measuring function comprises a sheath tube body, wherein a main channel and a pressure measuring channel which extend from a proximal end to a distal end are arranged in the sheath tube body, and an interface is arranged at the proximal end of the pressure measuring channel; the sheath pipe is characterized by further comprising a pressure detection device, wherein the pressure detection device comprises:
the shell is provided with a pressure measuring cavity and an installation cavity, the pressure measuring cavity is provided with an air inlet used for being communicated with a sheath pressure measuring interface and a vent hole used for being communicated with the outside, and a switch is arranged at the vent hole;
the pressure detection assembly is arranged in the installation cavity and comprises a gauge pressure sensor, a voltage adjusting circuit, an operational amplifier circuit and a conversion circuit, wherein the gauge pressure sensor, the voltage adjusting circuit and the operational amplifier circuit are electrically connected with the conversion circuit, and the gauge pressure sensor is used for converting a pressure signal in the pressure measurement cavity into a voltage signal;
The voltage adjusting circuit is used for increasing the voltage difference of the voltage signal, and the operational amplifier circuit is used for amplifying the increased voltage difference in a multiplied way; the conversion circuit is used for converting the multiplied voltage signal into a pressure value;
an aerogel insulator, which is encapsulated on the surface of the pressure sensing component to transmit pressure.
2. The sheath of claim 1, wherein the gauge pressure sensor has an input voltage positive pole (+vin), an input voltage negative pole GND (-vin), an analog signal output voltage positive pole (+out), an analog signal output voltage negative pole (-out); the voltage regulating circuit at least comprises a first resistor (R1) and a second resistor (R3), wherein the first resistor (R1) is connected in parallel between an input voltage positive electrode (+vin) and an analog signal output voltage positive electrode (+out), and the second resistor (R3) is connected in parallel between GND (-vin) and an analog signal output voltage negative electrode (-out).
3. The sheath of claim 1, wherein the op-amp circuit is a GS8332 precision op-amp chip that amplifies the voltage difference by a factor of 100.
4. The sheath according to claim 1, wherein the first resistor (R1) and the second resistor (R3) have a resistance of 100K.
5. The sheath of claim 1, wherein the switching circuit is a single-chip microcomputer stm32f103c8t6.
6. The sheath of claim 1, wherein the housing comprises:
the pressure measuring device comprises a base, wherein a pressure measuring pipe used for forming a pressure measuring cavity is arranged on the base, an air inlet is formed at one end of the pressure measuring pipe, an air vent is formed at the other end of the pressure measuring pipe, and an outlet is formed in the pressure measuring pipe and used for flowing out gas in the pressure measuring pipe;
the upper cover is arranged above the base;
the PCB is positioned in the base and fixed on the upper cover, the PCB integrates the pressure detection component and the control circuit, and the pressure detection component is arranged opposite to the outlet and is sealed by the aerogel insulating piece;
the control key is arranged on the shell and is in communication connection with the control circuit;
and the connecting cable is connected with the conversion circuit to output a pressure test value.
7. The method for detecting a sheath according to any one of claims 1 to 6, comprising the steps of:
the conversion stage comprises the steps that a gauge pressure sensor converts a pressure signal into a mu V-level voltage;
step 2) a voltage difference increasing stage, namely, a first resistor (R1) is connected in parallel between an input voltage positive electrode (+ vin) and an analog signal output voltage positive electrode (+ out), a second resistor (R3) is connected in parallel between an input voltage negative electrode GND (-vin) and an analog signal output voltage negative electrode (-out), the voltage difference is increased, and the mv level meets the minimum voltage difference requirement of an operational amplifier circuit;
Step 3) amplifying the voltage difference by 100 times through an operational amplifier circuit to reach the V (volt) level; range (0.5-3.0V)
Step 4) a conversion stage, converting the voltage difference in the step 3) into a pressure value through a conversion circuit and outputting the pressure value;
step 5) acquisition phase: the gauge pressure sensor is collected for a plurality of times, and the singlechip removes extremum and averages the extremum to convert the extremum into a pressure value and output the pressure value.
8. A pressure detecting device, characterized in that the pressure detecting device is the pressure detecting device according to any one of claims 1 to 6; the pressure detection device includes:
the shell is provided with a pressure measuring cavity and an installation cavity, the pressure measuring cavity is provided with an air inlet used for being communicated with a sheath pressure measuring interface and a vent hole used for being communicated with the outside, and a switch is arranged at the vent hole;
the pressure detection assembly is arranged in the installation cavity and comprises a gauge pressure sensor, a voltage adjusting circuit, an operational amplifier circuit and a conversion circuit, wherein the gauge pressure sensor, the voltage adjusting circuit and the operational amplifier circuit are electrically connected with the conversion circuit, and the gauge pressure sensor is used for converting a pressure signal in the pressure measurement cavity into a voltage signal;
The voltage adjusting circuit is used for increasing the voltage difference of the voltage signal, and the operational amplifier circuit is used for amplifying the increased voltage difference in a multiplied way; the conversion circuit is used for converting the multiplied voltage signal into a pressure value;
an aerogel insulator encapsulated at a surface of the pressure sensing component to transmit pressure;
preferably, the gauge pressure sensor has an input voltage positive electrode (+vin), an input voltage negative electrode GND (-vin), an analog signal output voltage positive electrode (+out), and an analog signal output voltage negative electrode (-out); the voltage regulating circuit at least comprises a first resistor (R1) and a second resistor (R3), wherein the first resistor (R1) is connected in parallel between an input voltage positive electrode (+vin) and an analog signal output voltage positive electrode (+out), and the second resistor (R3) is connected in parallel between GND (-vin) and an analog signal output voltage negative electrode (-out);
further preferably, the housing includes:
the pressure measuring device comprises a base, wherein a pressure measuring pipe used for forming a pressure measuring cavity is arranged on the base, an air inlet is formed at one end of the pressure measuring pipe, an air vent is formed at the other end of the pressure measuring pipe, and an outlet is formed in the pressure measuring pipe and used for flowing out gas in the pressure measuring pipe;
the upper cover is arranged above the base;
The PCB is positioned in the base and fixed on the upper cover, the PCB integrates the pressure detection component and the control circuit, and the pressure detection component is arranged opposite to the outlet and is sealed by the aerogel insulating piece;
the control key is arranged on the shell and is in communication connection with the control circuit;
and the connecting cable is connected with the conversion circuit to output a pressure test value.
9. An intelligent constant-pressure regulating perfusion suction system is characterized by comprising
The sheath of claims 1-6, the sheath body further having a suction channel;
an endoscope inserted in the sheath tube, the endoscope having a liquid feeding passage formed therein;
an irrigation device in communication with the fluid delivery channel for infusing an irrigation fluid into the body cavity;
the suction device is communicated with the suction channel and used for sucking out liquid in the human body cavity, and the perfusion device is matched with the suction device to keep the cavity at proper pressure;
the main control machine is in communication connection with the conversion circuit, the perfusion device and the suction device, and controls the flow and the pressure of the perfusion device and the suction device according to the pressure value output by the conversion circuit.
10. The method of constant pressure regulation of a perfusion aspiration system according to claim 9, comprising the steps of:
step 1) presetting a highest warning pressure value, a lowest warning pressure value, a pressure control value and a perfusion flow gear;
step 2) the main control machine controls the feeding of the perfusion device perfusion liquid and the suction of the suction device, and the intra-cavity pressure and the negative suction pressure are collected:
step 3) the pressure detection device collects the pressure in the cavity and transmits the pressure to the main control machine, the main control machine dynamically adjusts the pouring and suction states according to the pressure value monitored in real time and the data change trend of the pressure value, so that the pressure in the current cavity is balanced at a pressure control value, the pouring and suction balance states are realized, the pouring parameters comprise a pouring flow gear, and the suction parameters comprise the opening of a pressure release valve and a suction pressure threshold;
the main control machine voltage regulation mode comprises a coarse regulation mode, a fine regulation mode and a mixed regulation mode, wherein the coarse regulation mode aims at the extreme situation of the intra-cavity pressure, the fine regulation mode aims at the situation that the pressure difference of the intra-cavity pressure deviating from a pressure control value is smaller, and the mixed regulation mode aims at the situation that the intra-cavity pressure does not reach the extreme situation and meanwhile the deviating value is larger;
When the pressure difference between the pressure in the cavity and the pressure control value exceeds +/-20 mmHg, a rough adjustment mode is started; when the pressure difference exceeds +/-3 mmHg and is within +/-8 mmHg, starting a fine tuning mode; when the pressure difference is detected to be more than +/-8 mmHg and within +/-20 mmHg, starting a mixed regulation mode; the rough adjustment mode comprises the following steps that when the pressure value in the body cavity exceeds the highest warning line, the main control computer controls the perfusion flow gear to be lowered, the suction pressure threshold value is controlled to enable the suction flow to be greater than the perfusion flow, when the pressure difference in the cavity exceeds the lowest warning line, the perfusion flow gear is increased, the pressure release valve is opened, the suction pressure threshold value is adjusted to be a threshold value in a stable state, the rapid balance effect is achieved, and the pressure in the cavity is separated from an extreme state as soon as possible;
the fine tuning mode comprises the following steps: maintaining the filling gear to be operated, closing the pressure release valve, and performing pressure regulation by fine adjustment of the suction pressure threshold;
when the pressure difference exceeds-3 mmHg and is within-8 mmHg, keeping the perfusion flow gear unchanged, keeping the pressure release valve closed, keeping the perfusion running at present, observing the change trend of the uploaded data, if the pressure difference is in an ascending phase, increasing the suction pressure threshold, if the pressure difference is in a descending phase, reducing the suction pressure threshold and the reduction amplitude is larger than the amplitude of the suction pressure threshold in the ascending phase, so that the integral trend of reducing the suction pressure threshold is in the process of data adjustment, and the supercharging effect is achieved in a fine tuning mode; when the pressure difference exceeds 3mmHg and is within 8mmHg, the current gear operation is maintained by perfusion, the change trend of the uploaded data is observed, if the pressure difference is in an ascending phase, the suction pressure threshold value is increased, if the pressure difference is in a descending trend, the suction pressure threshold value is reduced, the reduction amplitude is smaller than the amplitude of the suction pressure threshold value increased in the ascending phase, and in the process of data adjustment, the overall trend of increasing the suction pressure threshold value is provided, so that the decompression effect is achieved;
The mixing regulation mode comprises the following steps: the perfusion flow fine adjustment, the pressure release valve fine adjustment and the suction pressure threshold fine adjustment are combined to jointly act on the intra-cavity pressure by combining the adjustment of the perfusion flow gear, the pressure release valve and the suction pressure threshold, so that the effect of increasing or reducing pressure is achieved; when the pressure difference is detected to be more than 8mmHg and within 20mmHg, the perfusion flow is properly reduced, the change trend of the uploaded data is observed, if the pressure difference is in a rising stage, the suction pressure threshold value is increased, and if the pressure difference is in a falling trend, the suction pressure threshold value is reduced, and the reduction amplitude is smaller than the increase amplitude of the suction pressure threshold value in the rising stage; in the process of data adjustment, the overall trend of increasing the suction pressure threshold value is that the decompression effect is achieved; when the pressure difference is detected to be lower than-8 mmHg and within-20 mmHg, the perfusion flow keeps the current operation, the pressure release valve is opened in a staged way, the change trend of the uploaded data is observed, if the pressure difference is in a rising stage, the suction pressure threshold value is increased, if the pressure difference is in a falling trend, the suction pressure threshold value is reduced, and the reduced amplitude is larger than the amplitude of the suction pressure threshold value in the rising stage; in the process of data adjustment, the whole device has the tendency of reducing the suction pressure threshold value, and the supercharging effect is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310718095.XA CN116649945A (en) | 2023-06-16 | 2023-06-16 | Pressure detection device and sheath tube and perfusion suction system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310718095.XA CN116649945A (en) | 2023-06-16 | 2023-06-16 | Pressure detection device and sheath tube and perfusion suction system with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116649945A true CN116649945A (en) | 2023-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310718095.XA Pending CN116649945A (en) | 2023-06-16 | 2023-06-16 | Pressure detection device and sheath tube and perfusion suction system with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116649945A (en) |
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2023
- 2023-06-16 CN CN202310718095.XA patent/CN116649945A/en active Pending
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