A perfusion liquid heater and its control method

Abstract

The present invention discloses an infusion liquid heater and a control method thereof. The infusion liquid heater includes a heating pipe provided with a liquid inlet and a liquid outlet, which is used to form a fluid channel for the flow of the infusion liquid to be contained inside; a heating component disposed inside the heating pipe, which is used to heat the infusion liquid when the infusion liquid flows from the liquid inlet to the liquid outlet; a flow disturbing component disposed inside the heating pipe, which is used to form a turbulent flow of the infusion liquid flowing inside the heating pipe; and a control system connected to the heating component, which is used to control the heating of the heating component and control the driving of the infusion liquid to flow inside the heating pipe. In this application, a heating component and a flow disturbing component are provided inside the heating pipe, so that the infusion liquids at different temperatures inside the infusion liquid are fully mixed, improving the heat conduction efficiency of the infusion liquid, ensuring that the temperature of the output infusion liquid can reach the required temperature, which is beneficial to the wide application of the infusion liquid and the improvement of the use effect.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to an infusion liquid heater and a control method for an infusion liquid heater. Background Art

[0002] The infusion liquid, also known as medical infusion liquid, is generally sterile normal saline, which can timely clean the bleeding, exudate, and contaminants generated during the operation. Through appropriate cleaning, necrotic tissue, exudate, accumulated blood, and pus in the wound can be removed, the number of bacteria in the wound can be reduced, the formation of adhesions and abscesses can be reduced, the wound infection rate, complication rate, and mortality can be lowered, and the surgical cavity can also be pressurized and expanded to form a visible space.

[0003] However, since the infusion liquid directly acts on human or animal tissues, there are high requirements for the temperature, pressure, flow rate, etc. of the medical infusion liquid. Among them, the pressure and flow rate of the infusion liquid can be accurately controlled by devices such as peristaltic pumps, while the temperature of the infusion liquid needs to be maintained by heating the room-temperature infusion liquid. If the temperature of the infusion liquid is too low, the patient's body heat will be carried away by the flushing liquid, causing complications such as hypothermia, arrhythmia, elevated blood pressure, prolonged awakening time, shivering, and restlessness.

[0004] Therefore, it is crucial for the application of infusion liquid in the medical field how to heat the infusion liquid and maintain a suitable temperature output. Summary of the Invention

[0005] The purpose of the present invention is to provide an infusion liquid heater and a control method for an infusion liquid heater, which can ensure that the infusion liquid is output in a state of stable and uniform temperature.

[0006] To solve the above technical problems, the present invention provides an infusion liquid heater, including:

[0007] A heating tube provided with an inlet and an outlet, for forming a fluid channel inside to accommodate the flow of the infusion liquid;

[0008] A heating component arranged inside the heating tube, for heating the infusion liquid when the infusion liquid flows from the inlet to the outlet;

[0009] A turbulence component arranged inside the heating tube, for forming turbulence in the flow of the infusion liquid inside the heating tube;

[0010] And a control system connected to the heating component, for controlling the heating of the heating component and controlling the driving of the infusion liquid to flow inside the heating tube.

[0011] Optionally, the fluid channel inside the heating tube is a cylindrical channel; the heating component is a component arranged on the central axis of the cylindrical channel; the flow disturbing component is a plurality of baffle plates arranged in sequence along the length direction of the heating component, and the heating component penetrates through the central positions of the respective baffle plates;

[0012] Wherein, the edges of the respective baffle plates are attached to the inner wall of the heating tube, and a plurality of fluid through holes are provided on each baffle plate, and adjacent two baffle plates are staggered with each other in the circumferential direction centered on the heating component.

[0013] Optionally, the heating tube is a serpentine pipe or a spiral pipe.

[0014] Optionally, it further includes an external circulation pipe communicated with the fluid channel inside the heating tube, the external circulation pipe and the heating tube are respectively connected through a first port and a second port, and a water pump is arranged at the first port or the second port;

[0015] When the water pump is started, the water pump drives the perfusion liquid in the heating tube to flow into the external circulation pipe through the first port, and drives the perfusion liquid in the external circulation pipe to flow into the heating tube through the second port.

[0016] Optionally, the first port is arranged at one end of the heating tube close to the liquid outlet, and the second port is arranged at one end of the heating tube close to the liquid inlet.

[0017] Optionally, the control system includes a temperature sensor arranged at the position of the liquid outlet inside the heating tube; a controller connected to the temperature sensor; a PTC heater connected to the controller and the heating component;

[0018] The controller is used to control the heating power output by the PTC heater to the heating component according to the temperature data measured by the temperature sensor at the position of the liquid outlet.

[0019] Optionally, the control system includes a PWM waveform generator, a switching device, and a power supply module;

[0020] The power supply module, the switching device, and the PTC heater are connected in series, and the control end of the switching device is connected to the output end of the PWM waveform generator;

[0021] The PWM waveform generator is used to output a PWM control signal corresponding to the duty ratio according to the duty ratio corresponding to the heating power determined by the controller, so as to control the opening and closing of the switching device.

[0022] A control method for a perfusion liquid heater, which is applied to the perfusion liquid heater described in any one of the above, includes:

[0023] Controlling the heating component in the perfusion liquid heater to be energized and generate heat;

[0024] Controlling the perfusion liquid to flow into the heating pipe from the liquid inlet in the perfusion liquid heater and flow out of the heating pipe from the liquid outlet.

[0025] Optionally, controlling the heating component in the perfusion liquid heater to be energized and generate heat includes:

[0026] Collecting the temperature data at the position of the liquid outlet in the heating pipe;

[0027] Performing PID algorithm operation according to the temperature data to determine the heating power of the heating component;

[0028] Controlling the energized heating of the heating component according to the heating power.

[0029] Optionally, it further includes:

[0030] When receiving an interruption liquid outlet instruction, controlling to interrupt the perfusion liquid from flowing into and flowing out of the heating pipe from the liquid inlet;

[0031] Starting a water pump for controlling the position of the first through port in the perfusion liquid heater to drive the perfusion liquid in the heating pipe and the external circulation pipe to circulate;

[0032] When the starting time of the water pump reaches a preset duration, and / or the liquid temperature at the position of the liquid outlet reaches a preset temperature range, controlling the water pump to stop working.

[0033] A perfusion liquid heater provided by the present invention includes a heating pipe provided with a liquid inlet and a liquid outlet, which is used to form a fluid channel for accommodating the flow of perfusion liquid inside; a heating component arranged inside the heating pipe, which is used to heat the perfusion liquid when the perfusion liquid flows from the liquid inlet to the liquid outlet; a turbulence generating component arranged inside the heating pipe, which is used to form a turbulent flow for the flow of the perfusion liquid inside the heating pipe; and a control system connected to the heating component, which is used to control the heating of the heating component and control the driving of the perfusion liquid to flow inside the heating pipe.

[0034] In the perfusion liquid heater provided in this application, a heating component is arranged inside the heating tube, so that when the perfusion liquid flows through the inside of the heating tube, it can absorb the heat on the heating component and then realize the heating of the perfusion liquid; on this basis, a flow disturbing component is further arranged along the direction from the liquid inlet to the liquid outlet. Under the action of the flow disturbing component, the perfusion liquid forms a swirling flow inside the heating tube, so that the perfusion liquids with different temperatures inside the perfusion liquid are fully mixed, improving the heat conduction efficiency between the perfusion liquids inside and between the perfusion liquid and the heating component; furthermore, it ensures that the temperature of the output perfusion liquid can reach the required temperature and ensures the uniformity of the output perfusion liquid, which is beneficial to the wide application of the perfusion liquid and improves its use effect.

[0035] This application also provides a control method for a perfusion liquid heater, which has the above beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 It is a schematic internal structure diagram of the perfusion liquid heater provided by the embodiment of this application;

[0038] Figure 2 It is a schematic internal structure diagram of the heating tube provided by the embodiment of this application;

[0039] Figure 3 It is a schematic structure diagram of the heating tube provided by the embodiment of this application;

[0040] Figure 4 It is another schematic structure diagram of the heating tube provided by the embodiment of this application;

[0041] Figure 5 It is a schematic power supply circuit structure diagram of the heating component provided by the embodiment of this application;

[0042] Figure 6 It is a schematic cross-sectional view of the connection structure between the heating tube and the external circulation tube provided by the embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] In actual surgery or other wound cleaning processes, to achieve good cleaning effects, it is necessary to ensure that the perfusion liquid sprayed onto the wound or human tissue not only meets temperature requirements but also has requirements for flow rate and water pressure. That is to say, the device for outputting the perfusion liquid needs to spray out perfusion liquid with a high flow rate, appropriate water pressure, and suitable temperature within a short period of time.

[0044] However, for the perfusion liquid, there is a positive correlation between its water pressure and flow rate. When the flow rate is relatively large, the consumption of the perfusion liquid is also relatively large. To ensure the temperature of the perfusion liquid, a large amount of perfusion liquid needs to be stored at a constant temperature, or the perfusion liquid needs to be heated to the required temperature within a short period of time. For the first method, the energy consumption for storing a large amount of perfusion liquid at a constant temperature is relatively high. For the second method, to heat the rapidly flowing perfusion liquid, the most common method is heat transfer, which requires raising the temperature of the object for heat transfer to the perfusion liquid to be much higher than the required temperature of the perfusion liquid, so that the perfusion liquid absorbs heat through heat transfer with this object during the flow process. However, this heating method often easily leads to problems such as the temperature not meeting the standard due to the too-fast flow rate of the perfusion liquid, or the temperature of the perfusion liquid being alternately hot and cold, unevenly hot and cold.

[0045] Therefore, in the process of heating the perfusion liquid in this application, a turbulence is set in the channel through which the perfusion liquid flows, so that the perfusion liquid flows in a turbulent manner during the flow process, making the contact between the perfusion liquid and the high-temperature heating component more sufficient, and ensuring that the perfusion liquid is output at a stable and appropriate temperature.

[0046] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0047] Figure 1 It is a schematic internal structure diagram of the perfusion liquid heater provided by the embodiment of the present application;

[0048] Figure 2 It is a schematic internal structure diagram of the heating tube provided by the embodiment of the present application.

[0049] The perfusion liquid heater may include:

[0050] A heating tube 10 provided with a liquid inlet 11 and a liquid outlet 12, which is used to form a fluid channel for accommodating the flow of the perfusion liquid inside; the perfusion liquid can flow into the heating tube from the liquid inlet 11, flow towards the liquid outlet 12, and finally flow out from the liquid outlet 12.

[0051] A heating component 13 disposed inside the heating tube 10 for heating the perfusion liquid when the perfusion liquid flows from the liquid inlet 11 to the liquid outlet 12;

[0052] A turbulence generating component 14 disposed inside the heating tube 10 for generating turbulence in the flow of the perfusion liquid; when the perfusion liquid flows inside the heating tube 10, turbulence can be formed due to the obstruction of the turbulence generating component 14, enabling uniform mixing of all parts of the perfusion liquid;

[0053] A control system connected to the heating component 13 for controlling the heating of the heating component 13 and controlling the flow of the perfusion liquid inside the heating tube.

[0054] Refer to Figure 1 , water pipes are connected to both the liquid inlet 11 and the liquid outlet 12 of the heating tube 10; the water pipe connected to the liquid inlet 11 is used to extract the normal-temperature perfusion liquid, and a liquid storage tank similar to one storing normal-temperature perfusion liquid can be connected to the other end of this water pipe; while the water pipe connected to the liquid outlet 12 is used to output the perfusion liquid heated after flowing through the heating tube 10 to clean the wound, so components such as a spray head or a high-pressure spray head can be connected to the other end of this water pipe. The flow of the perfusion liquid inside the heating tube 10, and even the flow in the fluid channel jointly formed by the two water pipes and the heating tube 10, all require a driving device similar to a peristaltic pump 101 to provide the driving force for the flow of the perfusion liquid. A peristaltic pump 101 can be set on one of the two water pipes to drive the flow of the perfusion liquid.

[0055] Certainly, whether the peristaltic pump 101 starts to work or not can be controlled by the controller in the control system; when the control system controls the peristaltic pump 101 to close and stop working, the perfusion liquid inside the heating tube 10 immediately stops flowing, and when the control system controls the peristaltic pump 101 to start working, the perfusion liquid inside the heating tube 10 can flow from the liquid inlet 11 and out through the liquid outlet 12 to start flowing, thereby realizing the control of the flow of the perfusion liquid inside the heating tube 10 by the control system.

[0056] Refer to Figure 2 , in order to heat the perfusion liquid flowing through the heating tube 10, a heating component 13 is disposed inside the heating tube 10. The heating component 13 in this embodiment can adopt an electrothermal device similar to a PTC heater, that is, when the circuit is connected, electrical energy can be converted into heat energy, causing its own temperature to rise, and the perfusion liquid comes into contact with the heating component in this high-temperature state, generating heat transfer, and then causing the temperature of the perfusion liquid to also rise. Whether the heating component is powered on or not can be controlled by the controller in the control system.

[0057] It can be understood that the part of the liquid filled in the heating tube 10 close to the heating component 13 is obviously in direct heat transfer with the heating component 13 and has the highest temperature. However, the part of the liquid filled relatively far from the heating component 13 needs to obtain heat through heat transfer with the part of the liquid filled close to the heating component 13, and its temperature is obviously lower. Therefore, the temperature of the filled liquid changes in a gradient from near to far from the heating component 13. This will obviously make the temperature of the filled liquid in the heating tube 10 relatively uneven. And once the heat transfer time of the filled liquid in each part is insufficient, it will directly lead to uneven temperature of the filled liquid output from the liquid outlet 12, that is, the temperature of the filled liquid for cleaning human tissues is uneven.

[0058] For this reason, in this embodiment, a flow disturbing component 14 is further arranged in the heating tube 10 to cause turbulent flow of the filled fluid when it flows in the heating tube 10. Obviously, during the turbulent flow of the filled fluid, the filled liquids at different temperatures will be fully mixed, thereby improving the heat transfer efficiency between the filled liquids to a certain extent. On this basis, the part of the filled liquid close to the heating component 13 is no longer the part with the highest temperature, and the temperature difference between the filled liquid close to the heating component 13 and the heating component 13 is relatively larger, further promoting the heat transfer efficiency between the heating component 13 and the filled liquid, thus improving the heating efficiency of the filled liquid in the heating tube 10, and greatly shortening the time required for the filled liquid to be heated from the normal temperature state to the required temperature. Then when actually outputting the filled liquid, it can further ensure that the filled liquid is hot and has a uniform temperature immediately, improving the use effect of the filled liquid in the medical field.

[0059] In an optional embodiment of the present application, the fluid channel inside the heating tube 10 is a cylindrical channel; the heating component 13 is a component arranged on the central axis of the cylindrical channel; the flow disturbing component 14 is a plurality of baffle plates arranged in sequence along the length direction of the heating component 13, and the heating component 13 penetrates through the central positions of each baffle plate; wherein, the edges of each baffle plate are attached to the inner wall of the heating tube 10, and a plurality of fluid through holes 141 are arranged on each baffle plate, and two adjacent baffle plates are staggered in the circumferential direction with the heating component 13 as the central axis.

[0060] In Figure 2 In the shown embodiment, the heating tubes 10 are all straight cylindrical tube structures, the heating components 13 are straight rod-shaped structures, and each flow disturbing component 14 is a baffle plate with a circular plate structure sleeved on the heating component 13, and the circular plate structure is provided with fluid through holes 141.

[0061] However, it can be understood that in actual applications, the heating tube 10, the heating component 13, and the flow disturbing component 14 are not limited to Figure 1 and Figure 2 the structures shown; such asFigure 3 and Figure 4 As shown, the heating pipe 10 can also be a serpentine pipe as shown in Figure 3 ; the heating pipe 10 can also be a spiral pipe as shown in Figure 4 . Compared with the heating pipe of the cylindrical pipe structure, the heating pipes of the serpentine pipe and the spiral pipe can obviously cause a turbulent flow effect on the flow of the perfusion fluid to a certain extent, and increase the flow path of the perfusion fluid in the heating pipe 10, that is, increase the heating duration of the perfusion liquid, so as to ensure that the perfusion liquid can be fully heated to the required temperature.

[0062] Of course, no matter whether the heating pipe 10 is a straight cylindrical pipe, a spiral pipe, or a serpentine pipe, it does not affect the heating component 13 to be arranged along the central axis of the heating pipe 10, and its shape should match the shape of the heating pipe 10, so as to ensure the uniformity of the heating effect of the perfusion liquid in all directions; when the heating pipe is of a straight cylindrical pipe structure, the heating component as a whole should also be of a linear structure; for example, it can be a plurality of mutually parallel linear heating rods, or it can be similar to the structure of the heating pipe described in Figure 3 and Figure 4 , and no specific limitation is made in this embodiment.

[0063] In addition, for the flow disturbing component 14, it can also be a fan blade structure, or a baffle structure arranged on the pipe wall of the heating pipe 10 in an intersecting manner, etc., and no specific limitation is made in this embodiment. As long as it can cause disturbance to the flow of the perfusion liquid and promote the uniformity of the temperature of the perfusion liquid, it belongs to the protection scope of this application.

[0064] The required temperature of the perfusion liquid output by heating is generally at or slightly higher than the normal body temperature of a person. Correspondingly, for the heating component 13, the magnitude of its heating power obviously directly determines the temperature of the perfusion liquid when it is output.

[0065] It can be understood that the heating power of the heating component 13 can be controlled and adjusted by a control system. In actual applications, the heating component 13 can be continuously maintained at a stable heating power through repeated tests. Before the perfusion liquid enters the heating pipe 10, its temperature is generally the same as the ambient room temperature, but the ambient temperature in the operating room or other medical places in the hospital is not completely constant. Therefore, it is generally difficult to determine a constant heating power to meet the heating requirements of the perfusion liquid under all room temperature conditions.

[0066] Therefore, in an alternative embodiment of the present application, a temperature sensor 3 can be further disposed at the position of the liquid outlet in the heating tube. The temperature sensor 3 can upload temperature data to the controller in the control system in real time, and the controller can perform feedback adjustment on the heating power of the heating component 13 according to the temperature data. Specifically, the controller can use the PID algorithm to combine the temperature data measured by the temperature sensor 3 to perform feedback adjustment on the heating power of the heating component 13.

[0067] In order to improve the temperature control accuracy of the perfusion liquid output from the liquid outlet 12, temperature sensors 3 can also be disposed at both the liquid inlet 11 and the liquid outlet 12, and the temperature data at both locations are used together as the data basis for feedback adjustment of the heating power of the heating component 13.

[0068] Since the temperature of the perfusion liquid finally output from the liquid outlet is the final result of the heat exchange with the heating component 13 during the entire flow process from the liquid inlet 11 to the liquid outlet 12, it is obvious that the temperature of the perfusion liquid at the liquid inlet 11 and at the position between the liquid inlet 11 and the liquid outlet 12 also affects to a certain extent its final temperature when output from the liquid outlet 12.

[0069] In order to further improve the accuracy of temperature control of the output perfusion liquid, it can be further considered to dispose temperature sensors 3 at the position of the liquid inlet 11 in the heating tube 10, at the intermediate position between the liquid inlet 11 and the liquid outlet 12, and at the position of the liquid outlet 12. Even more temperature sensors 3 can be disposed between the liquid inlet 11 and the liquid outlet 12 to determine the temperature change gradient of the perfusion liquid in the heating tube 10 from the liquid inlet to the liquid outlet, and combined with this change gradient and the current temperature data of the liquid outlet 12, the heating power of the heating component 13 can be controlled more accurately.

[0070] Optionally, the heating component 13 can also be divided into three or more independent segments in the direction from the liquid inlet 11 to the liquid outlet 12, and the heating power of each segment of the heating component 13 is independently controlled, thereby avoiding to a certain extent the problem of increased difficulty in controlling the heating power of the heating component 13 when the temperature of the perfusion liquid newly flowing in from the liquid inlet 11 is too low and the temperature of the perfusion liquid that has not yet flowed out from the liquid outlet 12 is just appropriate.

[0071] For example, if the temperature of the perfusion liquid newly flowing in at the liquid inlet 11 is low, the heating power of the part of the heating component 13 close to the liquid inlet 11 can be appropriately increased, and since the temperature of the perfusion liquid at the liquid outlet 12 is appropriate, the heating power of this part of the heating component 13 can be kept unchanged, thereby achieving stable control of the temperature of the perfusion liquid in each part of the heating tube 10.

[0072] Of course, it can be understood that the temperature of the liquid being poured in the heating tube 10 from the liquid inlet 11 to the liquid outlet 12 should generally show a gradient change from low to high. Dividing the heating component 13 into several parts with independently controlled heating powers is to maintain the stability of the temperature gradient change of the poured liquid. Once there is a sudden increase or decrease in the temperature gradient at a certain position, the heating power of the heating component 13 at the corresponding position can be adjusted by control, thereby ensuring the uniformity of the temperature of the finally output poured liquid.

[0073] In order to more precisely control and adjust the heating power of the heating component, in an alternative embodiment of the present application, the control system may further include a PWM waveform generator, a switching device, and a power supply module;

[0074] The power supply module, the switching device, and the PTC heater are connected in series, and the control end of the switching device is connected to the output end of the PWM waveform generator;

[0075] The PWM waveform generator is used to output a PWM control signal corresponding to the duty cycle according to the duty cycle determined by the control system based on the heating power, so as to control the opening and closing of the switching device.

[0076] Refer to Figure 5 , Figure 5 which is a schematic diagram of the power supply circuit structure of the heating component provided by the embodiment of the present application. Figure 5 In the power supply module AC, the PTC heater, and the switching device Q in [reference figure] are connected in series in sequence; when the switching device Q is turned off, the circuit formed by the power supply module AC and the PTC heater is disconnected from the ground terminal, and the entire circuit is in an open circuit state, unable to supply power to the PTC heater, and the PTC heater stops working; while when the switching device Q is in the closed and connected state, the power supply module AC and the PTC heater form a complete path, and the PTC heater is energized and generates heat. In Figure 5 the switching device Q shown is a PMOS transistor, and its control end is connected to the PWM waveform signal generator. Through the PWM control signal output by the PWM waveform signal generator, the switching device Q can be controlled to switch between the open circuit and the path states, and the duty cycle of the PWM control signal also determines the heating duration of the PTC heater in one cycle, and thus determines the heating power of the PTC heater. And for the duty cycle of the PWM control signal, it can be determined by the heating power of the heating component obtained by the controller through PID operation based on the temperature data collected by the above temperature sensor 3.

[0077] In this embodiment, the PWM waveform generator controls the conduction and turn-off of the semiconductor switching device Q, so that its output terminal obtains a pulse signal to replace the sine wave signal. By modulating the signal width of the pulse signal (that is, modulating the duty cycle of the pulse signal), the heating power of the PTC heater can be changed. Its hardware circuit is simple, can be controlled in real time, has a fast current response, and ensures the accuracy of the heating power control of the PTC heater.

[0078] For the switching device Q in this embodiment, it is not limited to Figure 5 the PMOS transistor shown. NMOS transistors, triodes, etc. similar to it can also implement the embodiments of this application, and no specific limitations are made in this application.

[0079] In addition, Figure 5 In the embodiment shown, a rectifier filter circuit including a rectifier bridge composed of four diodes, an inductance element L, and a filter circuit composed of a capacitor C, a transformer T and other circuit devices can further be provided between the power supply module AC and the PTC heater; after the AC voltage output by the power supply module AC passes through the rectifier filter circuit, the transformer T and other circuit devices, a stable DC voltage is output to the PTC heater for the PTC heater to heat the perfusion liquid.

[0080] In addition, it can be understood that when the controller calculates and determines the heating power of the heating component 13 based on the temperature data measured by the temperature sensor 3, it needs to be determined under the condition that parameters such as the flow rate and pressure of the perfusion liquid output by the perfusion liquid heater are known, so as to ensure that the temperature of the perfusion liquid is stable regardless of the output flow rate.

[0081] Based on the above discussion, a control panel for user operation control can be provided on the perfusion liquid heater 10 of this application. The user can input an operation instruction through the control panel. After the control system receives the operation instruction, it can start working; after the user turns on the perfusion liquid heater, the controller in the control system can first control the power supply circuit of the heating component 13 to start power supply and preheat the heating component 13. After heating for a period of time, the controller turns on the peristaltic pump 101 to start the circulation of the perfusion liquid in the water pipe and the heating pipe. The part of the perfusion liquid originally existing in the heating pipe 10 can be released and flowed out first. When the temperature of the perfusion liquid flowing out of the heating pipe 10 reaches stability, the wound of the patient can be cleaned.

[0082] In summary, for the perfusion liquid heater provided in the present application, on the basis of arranging a heating component for heating the perfusion liquid in its heating tube, a turbulent flow assembly is further arranged, so that the perfusion liquid in the heating tube forms a turbulent flow during the flowing process, which to a certain extent accelerates the heat transfer inside the perfusion liquid and also accelerates the heat transfer between the perfusion liquid and the heating component. Furthermore, it ensures that the perfusion liquid can be quickly heated to the expected temperature, avoids the problem of uneven temperature of the perfusion liquid output from the heating tube, and is conducive to the good application of the perfusion liquid in the medical field.

[0083] Based on the above embodiments, the present application further considers that when medical staff use the perfusion liquid to clean the wound, it is inevitable to control the output of the perfusion liquid at the liquid outlet to be interrupted multiple times briefly. When the output of the perfusion liquid is suddenly interrupted, the perfusion liquid in the heating tube 10 also stops flowing. At this time, the temperature of the heating component 13 does not drop immediately and still continues to have a heating effect on the perfusion liquid. If after a short time, the medical staff controls the output of the perfusion liquid in the heater again, the temperature of the output perfusion liquid may be too high, which is likely to cause a risk of scalding to the patient.

[0084] In order to meet the requirement of using the perfusion liquid immediately after stopping, as Figure 6 shown, Figure 6 is a schematic cross-sectional view of the connection structure between the heating tube and the external circulation tube provided by the embodiment of the present application.

[0085] In an optional embodiment of the present application, it may further include:

[0086] An external circulation tube 20 connected to the fluid channel inside the heating tube 10. The external circulation tube 20 and the heating tube 10 are respectively connected through a first through port 21 and a second through port 22, and a water pump 23 is arranged at the first through port 21 or the second through port 22;

[0087] When the water pump 23 is started, the water pump 23 drives the perfusion liquid in the heating tube 10 to flow into the external circulation tube 20 through the first through port 21, and drives the perfusion liquid in the external circulation tube 20 to flow into the heating tube through the second through port 22.

[0088] As Figure 6As shown, when the perfusion liquid flows in the heating pipe 10, if the water pump 23 located at the first through port 21 is not started, then at this time the external circulation pipe 20 is equivalent to a blind alley, and the perfusion liquid inside it cannot flow mutually with the perfusion liquid in the heating pipe 10, and the perfusion liquid in the heating pipe 10 remains stationary. When the perfusion liquid stops flowing in the heating pipe 10, the water pump 23 can be started at this time. The water pump 23 drives the perfusion liquid in the heating pipe 10 and the external circulation pipe 20 to form a circulating flow channel through the first through port 21 and the second through port 22, so that the liquid in the heating pipe 10 flows from the first through port 21 into the external circulation pipe 20, and the perfusion liquid in the external circulation pipe 20 flows into the heating pipe 10 from the second through port 22; this also enables a mixed flow to be formed between the perfusion liquid with a higher temperature in the heating pipe 10 and the perfusion liquid with a lower temperature in the external circulation pipe 20, and the waste heat of the heating component 13 can be absorbed to a certain extent by the perfusion liquid in the external circulation pipe 20, avoiding the problem that the temperature of the perfusion liquid in the heating pipe 10 is too high.

[0089] Optionally, the above-mentioned first through port 21 can be arranged at one end of the heating pipe 10 close to the liquid outlet 12, and the second through port 22 is arranged at one end of the heating pipe 10 close to the liquid inlet 11.

[0090] As shown above, for the temperature of the perfusion liquid in the heating pipe 10, along the direction from the liquid inlet 11 to the liquid outlet 12, the temperature of the perfusion liquid gradually increases; therefore, when the perfusion liquid stops flowing in the heating pipe 10, only a part of the perfusion liquid with the highest temperature close to the liquid outlet 12 in the heating pipe 10 can flow into the external circulation pipe 20, and a part of the perfusion liquid with a lower temperature flows in from the position of the heating pipe 10 close to the liquid inlet 11. At this time, the perfusion liquid in the heating pipe 10 close to the liquid outlet 12 flows from the middle section position of the heating pipe 10. Even if the temperature of this part of the perfusion liquid rises due to the waste heat of the heating component 13, it will not rise too high and can just rise to a temperature suitable for wound irrigation (which can be achieved by controlling the amount of circulating flow of the perfusion liquid between the heating pipe and the external circulation pipe). At this time, if it is exactly necessary for the heating pipe 10 to output the perfusion liquid again, the perfusion liquid with a suitable temperature can be immediately output.

[0091] Of course, in actual application, the positions of the first through port 21 and the second through port 22 can also be interchanged. When the perfusion liquid in the heating pipe 10 does not output from the liquid outlet 12, the water pump 23 can be started to directly realize the complete mixed flow of the perfusion liquid in the heating pipe 10 and the external circulation pipe 20, so that the perfusion liquid in the heating pipe 10 and the external circulation pipe 20 reaches an equilibrium temperature as a whole and jointly absorbs the waste heat of the heating component 13, and can also avoid the problem that the temperature of the perfusion liquid in the heating pipe 10 is too high to a certain extent.

[0092] An embodiment of a control device for a perfusion liquid heater is also provided in this application, which is applied to the perfusion liquid heater described in any one of the above, and includes:

[0093] Control the heating component in the perfusion liquid heater to be energized and generate heat;

[0094] Control the perfusion liquid to flow into the heating pipe from the liquid inlet in the perfusion liquid heater and flow out of the heating pipe from the liquid outlet.

[0095] Optionally, the process of controlling the heating component in the perfusion liquid heater to be energized and generate heat may include:

[0096] Collect the temperature data at the position of the liquid outlet in the heating pipe;

[0097] Perform PID algorithm operation according to the temperature data to determine the heating power of the heating component;

[0098] Control the energized heating of the heating component according to the heating power.

[0099] The function of the PID algorithm is reflected by three functions: proportional, integral, and derivative. The proportional function is to control the response speed quickly and adjust the energy output rapidly; the function of the integral is to eliminate the residual error and not drag the long tail; the function of the derivative is to adjust the output energy in advance according to the change and trend of the deviation signal.

[0100] Furthermore, in order to achieve high-precision control of the heating power, the PID control system can adopt a full closed-loop control strategy, that is, through the input of a flow sensor and two temperature sensors at the liquid inlet and liquid outlet, after the operation of a calculus equation containing a heating proportional coefficient, the heater power parameters and the on and off instructions of the power supply module are instantaneously output to control the operation of the entire device in real time. That is to say, when the pressure remains unchanged, how many degrees of water with a certain flow rate need to be heated per second, and the heater needs to obtain accurate power supply energy, thus avoiding the occurrence of medical accidents at the source.

[0101] In addition, the PID algorithm is an iterative learning control, which can improve the input control target of the heating pipe 10 through iterative correction; the principle of the PID algorithm is relatively simple, and it can track the actual operation trajectory of the output temperature control object with high precision within a given time range to track the given desired trajectory, improving the stability of the entire system of the perfusion liquid heater, and having good adaptability, strong robustness, and anti-interference ability that meet the clinical application scenarios.

[0102] Furthermore, when medical staff use the perfusion liquid for cleaning, it is necessary to briefly interrupt the output of the perfusion liquid, and the instruction to interrupt the liquid output can be input through the operation panel of the perfusion liquid heater or the control button of the perfusion liquid nozzle.

[0103] When the controller receives an instruction to interrupt the liquid output, it controls the interrupted perfusion liquid to flow into the heating tube from the liquid inlet and flow out of the heating tube from the liquid outlet;

[0104] The water pump that controls the position of the first through port in the perfusion liquid heater is started to drive the perfusion liquid in the heating tube and the external circulation tube to circulate;

[0105] When the start time of the water pump reaches the preset duration, and / or the liquid temperature at the position of the liquid outlet reaches the preset temperature range, the water pump is controlled to stop working.

[0106] When the medical staff controls the interruption of the perfusion liquid output, the perfusion liquid in the heating tube stops flowing; at this time, the power supply circuit of the heating component can be controlled to be disconnected at the same time to interrupt the heating of the heating component, and at the same time, the water pump at the first through port connecting the external circulation tube and the heating tube is controlled to start working, so that the perfusion liquid in the external circulation tube and the heating tube circulates and mixes with each other, thereby avoiding the continuous increase in the temperature of the perfusion liquid in the heating tube to too high; and when the perfusion liquid in the heating tube and the external circulation tube has been fully mixed to ensure that the residual heat of the heating component in the heating tube is not enough to raise the temperature of the perfusion liquid too high, the water pump can be stopped.

[0107] Obviously, in the actual application process, it is possible that the duration of the start-up operation of the water pump has not yet reached the set duration, or the liquid temperature has not yet reached the preset temperature range, and the user may also control the output of the perfusion liquid again. At this time, the water pump can be immediately controlled to stop working, and the power supply circuit of the heating component can be immediately reconnected to supply power.

[0108] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes the inherent elements thereof. Without more limitations, the element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element. In addition, the parts of the above technical solutions provided by the embodiments of the present application that are consistent with the corresponding technical solutions in the prior art in terms of implementation principles are not described in detail to avoid excessive elaboration.

[0109] In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A control method for a perfusion liquid heater, characterized in that Applied to a perfusion liquid heater, wherein the perfusion liquid heater includes a heating tube provided with a liquid inlet and a liquid outlet, for forming a fluid channel inside to accommodate the flow of the perfusion liquid; a heating component arranged inside the heating tube, for heating the perfusion liquid when the perfusion liquid flows from the liquid inlet to the liquid outlet; a turbulence generating component arranged inside the heating tube, for generating turbulence in the flow of the perfusion liquid inside the heating tube; a control system connected to the heating component, for controlling the heating of the heating component and controlling the driving of the perfusion liquid to flow inside the heating tube; and an external circulation tube communicating with the fluid channel inside the heating tube, the external circulation tube and the heating tube are respectively connected through a first port and a second port, and a water pump is arranged at the first port or the second port; when the water pump is started, the water pump drives the perfusion liquid inside the heating tube to flow into the external circulation tube through the first port, and drives the perfusion liquid inside the external circulation tube to flow into the heating tube through the second port; the first port is arranged at one end of the heating tube close to the liquid outlet, and the second port is arranged at one end of the heating tube close to the liquid inlet; The control method includes: Controlling the heating component in the perfusion liquid heater to be energized and heated; Controlling the perfusion liquid to flow into the heating tube from the liquid inlet in the perfusion liquid heater and flow out of the heating tube from the liquid outlet; When an interruption of liquid outlet instruction is received, then controlling the interruption of the perfusion liquid flowing into and flowing out of the heating tube from the liquid inlet and the liquid outlet; Controlling the water pump at the position of the first port in the perfusion liquid heater to start, so as to drive the perfusion liquid in the heating tube and the external circulation tube to circulate; When the start time of the water pump reaches a preset duration, and / or the liquid temperature at the position of the liquid outlet reaches a preset temperature range, then controlling the water pump to stop working.

2. The control method of the infusion liquid heater according to claim 1, characterized in that, Controlling the heating component in the perfusion liquid heater to be energized and heated includes: Collecting the temperature data at the position of the liquid outlet inside the heating tube; Performing a PID algorithm operation according to the temperature data to determine the heating power of the heating component; Controlling the energized heating of the heating component according to the heating power.

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