Blood purification equipment and liquid level adjusting method thereof

Abstract

The invention provides blood purification equipment and a liquid level adjusting method thereof, the blood purification equipment comprises a liquid level pot, the side wall of the liquid level pot is provided with at least one ultrasonic sensor, and the ultrasonic sensor comprises a transmitting end and a receiving end; the liquid level adjusting method comprises the steps that for any ultrasonic sensor, signal intensity of a transmitting end and signal intensity of a receiving end of the ultrasonic sensor are obtained, and the ratio of the signal intensity of the receiving end to the signal intensity of the transmitting end is determined; for any one ultrasonic sensor, if the ratio is greater than a first preset threshold value, determining that the liquid level of the liquid in the liquid level kettle is not lower than the height of the ultrasonic sensor, and if the ratio is between the first preset threshold value and a second preset threshold value, determining that the height of the foam in the liquid level kettle is not lower than the height of the ultrasonic sensor; and if the ratio is smaller than a second preset threshold value, determining that the liquid level of the liquid in the liquid level kettle is lower than the height of the ultrasonic sensor. The height of the liquid level in the liquid level kettle can be timely and accurately adjusted, and the safety of blood purification is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blood purification, and in particular, to a blood purification device and a liquid level adjustment method thereof. Background Art

[0002] A blood purification device is used to draw blood from a patient's body into an extracorporeal circulation circuit, remove specific molecular substances in the blood through a blood purifier, and then transfuse the purified blood back into the patient's body to complete the blood purification process. A liquid level pot for concentrating blood is provided in the extracorporeal circulation circuit. The liquid level pot includes a venous pot and an arterial pot. By providing a liquid level pot in the extracorporeal circulation circuit, it is convenient for medical staff to observe the blood condition, collect and remove air bubbles in the pipeline, etc. Among them, the venous pot is connected in series in the venous pipeline, which can buffer the blood flow rate, remove air bubbles in the blood, and ensure the safety of the blood transfused back to the patient through the venous pipeline.

[0003] During the blood purification process, it is usually necessary to monitor the liquid level height in the liquid level pot so that the liquid level height in the liquid level pot is maintained within a suitable range, thereby effectively preventing air bubbles from directly entering the human body and ensuring the safety of blood purification. However, during the process of blood dripping into or flowing into the liquid level pot, the impact of the blood on the liquid surface will bring some air into the liquid surface to form tiny bubbles. When monitoring the liquid level height in the liquid level pot in the prior art, the foam (or tiny air bubbles) in the liquid level pot is usually recognized as liquid and misjudgment occurs. When there is a lot of foam in the liquid level pot, these foams will be recognized as liquid, and it is easy to have the situation of misjudgment of the liquid level height detection, and the liquid level height in the liquid level pot cannot be adjusted in time and accurately, or the liquid level height in the liquid level pot cannot be maintained within a suitable range, affecting the safety during the blood purification process. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned defects of the prior art, and provides a liquid level adjustment method and device for a blood purification device, so as to reduce the misjudgment of the liquid level height detection in the liquid level pot, adjust the liquid level height in the liquid level pot in time and accurately, keep the liquid level height in the liquid level pot within a suitable range, and improve the safety during the blood purification process.

[0005] To solve the above problems, a first aspect of the present invention provides a liquid level adjustment method for a blood purification device. The blood purification device includes a liquid level pot, and at least one ultrasonic sensor is provided on the side wall of the liquid level pot. The ultrasonic sensor includes a transmitting end and a receiving end, and the transmitting end and the receiving end are arranged on opposite sides of the liquid level pot in the horizontal direction;

[0006] The liquid level adjustment method includes:

[0007] For any one of the ultrasonic sensors, obtain the signal intensities of the transmitting end and the receiving end of the ultrasonic sensor respectively, and determine the ratio between the signal intensity of the receiving end and that of the transmitting end;

[0008] For any one of the ultrasonic sensors, if the ratio is greater than a first preset threshold, it is determined that the liquid level in the liquid level pot is not lower than the height of the ultrasonic sensor; if the ratio is between the first preset threshold and the second preset threshold, it is determined that the height of the foam in the liquid level pot is not lower than the height of the ultrasonic sensor; if the ratio is less than the second preset threshold, it is determined that the liquid level in the liquid level pot is lower than the height of the ultrasonic sensor;

[0009] The first preset threshold is greater than the second preset threshold.

[0010] Further, the at least one ultrasonic sensor includes a first ultrasonic sensor and a second ultrasonic sensor, and the second ultrasonic sensor is located above the first ultrasonic sensor;

[0011] The liquid level adjustment method further includes:

[0012] If the liquid level in the liquid level pot is lower than the height of the first ultrasonic sensor, it is determined that the liquid level in the liquid level pot is lower than the preset height, and the liquid level in the liquid level pot is raised until the liquid level in the liquid level pot is adjusted to the preset height;

[0013] Or, if the liquid level in the liquid level pot is lower than the height of the first ultrasonic sensor and the height of the foam in the liquid level pot is not lower than the height of the second ultrasonic sensor, it is determined that the liquid level in the liquid level pot is lower than the preset height, and the liquid level in the liquid level pot is raised until the liquid level in the liquid level pot is adjusted to the preset height;

[0014] Or, if the height of the foam in the liquid level pot is not lower than the height of the first ultrasonic sensor and the liquid level in the liquid level pot is lower than the height of the second ultrasonic sensor, it is determined that the liquid level in the liquid level pot is lower than the preset height, and the liquid level in the liquid level pot is raised until the liquid level in the liquid level pot is adjusted to the preset height.

[0015] Further, the liquid level adjustment method further includes:

[0016] If the liquid level in the liquid level pot is not lower than the height of the second ultrasonic sensor, it is determined that the liquid level in the liquid level pot is higher than the preset height, and the liquid level in the liquid level pot is lowered until the liquid level in the liquid level pot is adjusted to the preset height.

[0017] Further, the liquid level adjustment method further includes:

[0018] If the height of the foam in the liquid level pot is not lower than the height of the first ultrasonic sensor and the height of the foam in the liquid level pot is not lower than the height of the second ultrasonic sensor, then the foam in the liquid level pot exceeds the preset range, and a foam clearing operation is performed.

[0019] Further, the foam clearing operation includes:

[0020] Raise the liquid level of the liquid in the liquid level pot until the liquid level pot is full of liquid, and then lower the liquid level of the liquid in the liquid level pot so that the liquid level of the liquid in the liquid level pot is at a preset height.

[0021] Further, the first preset threshold is P1, 80% ≤ P1 < 100%; the second preset threshold is P0, 0 ≤ P0 ≤ 10%.

[0022] Further, the distance between the first ultrasonic sensor and the second ultrasonic sensor is 1 / 8 to 1 / 5 of the height of the liquid level pot.

[0023] Further, the blood purification device further includes an air pump, a blood pump, and a venous clamp. The air pump and the blood pump are both connected to the input end of the liquid level pot, and the venous clamp is connected to the output end of the liquid level pot;

[0024] The liquid level of the liquid in the liquid level pot is adjusted by the following method:

[0025] When the liquid level pot is connected to the air pump, turn on the air pump, the venous clamp, and the blood pump to lower the liquid level of the liquid in the liquid level pot.

[0026] Further, the blood purification device further includes a second branch pipe. The second branch pipe is located between the air pump and the liquid level pot and is connected to the atmosphere;

[0027] The liquid level of the liquid in the liquid level pot is also adjusted by the following method:

[0028] When the venous pot is connected to the branch pipe, turn off the air pump and the venous clamp, and turn on the blood pump to raise the liquid level of the liquid in the liquid level pot.

[0029] A second aspect of the present invention provides a blood purification device, including a liquid level pot, at least one ultrasonic sensor is provided on the side wall of the liquid level pot, the ultrasonic sensor includes a transmitting end and a receiving end, the transmitting end and the receiving end are arranged on opposite sides of the liquid level pot in the horizontal direction, the blood purification device further includes a processor and a memory, the processor is electrically connected to the memory and at least one ultrasonic sensor, the memory stores program instructions executable by the processor, and the processor can execute the liquid level adjustment method as described in the first aspect by calling the program instructions.

[0030] For the blood purification device and its liquid level adjustment method of the present invention, according to the magnitude relationship between the ratio of the signal intensities of the transmitting end and the receiving end of the ultrasonic sensor and the first preset threshold and the second preset threshold, it can accurately identify whether it is liquid, foam or air at the liquid level corresponding to the ultrasonic sensor, avoiding misjudging foam as liquid, reducing the misjudgment of the liquid level height detection in the liquid level pot, improving the accuracy of liquid level detection, and thus being able to timely and accurately adjust the liquid level height in the liquid level pot to keep the liquid level height in the liquid level pot within a suitable range, which is beneficial to improving the safety during the blood purification process. In addition, the ultrasonic sensor in the present invention can not only detect the liquid level, but also has the function of identifying foam in the liquid level pot, without adding a special foam detector in the liquid level pot, which not only reduces the cost of the blood purification device, but also can accurately identify the foam in the liquid level pot, which is beneficial to timely handling of the abnormal situation of excessive foam in the liquid level pot, and further improves the safety of the blood purification process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of an embodiment of the blood purification device provided by an embodiment of the present invention;

[0032] Figure 2 It is a partial structural diagram of the blood purification device provided by an embodiment of the present invention;

[0033] Figure 3 It is a flowchart of the liquid level adjustment method of the blood purification device provided by an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the blood purification device provided by an embodiment of the present invention for liquid level adjustment;

[0035] Figure 5 It is a schematic structural diagram of another embodiment of the blood purification device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will specifically describe the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems. The following several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0037] It should be noted that the examples of the embodiments of the present application are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0038] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present application means the presence of features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0039] See Figure 1 , Figure 1 is a schematic structural diagram of an embodiment of a blood purification device in an embodiment of the present application. Combining Figure 1As shown in the figure, the blood purification device includes an arterial line 1, a venous line 2, an anticoagulation branch 3, a blood pump 4, a heparin pump 5, a blood purifier 6, a liquid level pot 7, a bubble detector 8, and a venous clamp 9. Among them, the input end of the arterial line 1 is connected to the human arterial blood vessel, the output end of the arterial line 1 is connected to the blood input end of the blood purifier 6, the input end of the venous line 2 is connected to the blood output end of the blood purifier 6, and the output end of the venous line 2 is connected to the human venous blood vessel to form a blood circulation loop. The anticoagulation branch 3 is connected to the arterial line 1, and the heparin pump 5 is arranged on the anticoagulation branch 3. During the blood purification process of the blood purifier 6, the heparin pump 5 outputs heparin to the arterial line 1 through the anticoagulation branch 3 to play an anticoagulant role. The blood pump 4 is arranged on the arterial line 1 and is used to provide driving force for the blood in the arterial line 1 so that the blood in the arterial line 1 can be transmitted at a specific flow rate, thereby ensuring that the blood in the arterial line 1 is in a normal flowing state. The venous line 2 returns the blood purified by the blood purifier 6 to the human venous line, thus completing the hemodialysis process. This blood purification device can be applied to different blood purification treatment modes. The type of the blood purifier 6 can be a hemoperfusion cartridge, a dialyzer, etc. or a combination thereof, and there are correspondingly various pipeline connection methods in the blood purification device. Figure 1 Only the basic connection method is shown.

[0040] The liquid level pot 7 is arranged on the venous line 2. The liquid level pot 7 is used to buffer the blood flow rate and remove the bubbles in the blood to ensure the safety of the blood returned to the human body through the venous line 2. The bubble detector 8 and the venous clamp 9 are both arranged on the venous line 2, and the bubble detector 8 is located between the liquid level pot 7 and the venous clamp 9. The bubble detector 8 is used to detect whether there are bubbles in the venous line 2, and the venous clamp 9 is used to control the on-off of the venous line 2. In this embodiment, at least one ultrasonic sensor 10 is arranged on the side wall of the liquid level pot 7. The ultrasonic sensor 10 includes a transmitting end and a receiving end. The transmitting end and the receiving end are arranged on opposite sides of the liquid level pot 7 in the horizontal direction. The signal emitted by the transmitting end is the transmitted signal, and the signal received by the receiving end is the received signal. The liquid level in the liquid level pot 7 is adjusted through the transmitted signal and the received signal. For the specific adjustment method, refer to the liquid level adjustment method described below.

[0041] Refer to Figure 3 , Figure 3 which is a flowchart of the liquid level adjustment method of the blood purification device provided by the embodiment of the present application. In the first aspect of the embodiment of the present application, a liquid level adjustment method of a blood purification device is provided. The blood purification device further includes a memory and a processor. The processor is electrically connected to the memory and at least one ultrasonic sensor 10 through a bus. The memory stores program instructions executable by the processor. The processor can execute the following liquid level adjustment method by calling the program instructions:

[0042] Step S310: For any one of the ultrasonic sensors 10, obtain the signal intensities of the transmitting end and the receiving end of the ultrasonic sensor 10 respectively, and determine the ratio between the signal intensity of the receiving end and that of the transmitting end.

[0043] The ultrasonic sensor 10 can identify the liquid state in the liquid level kettle 7. The liquid state includes liquid, foam, and air. Among them, the foam refers to a substance in which a plurality of bubbles with a diameter less than 1.5 mm are adhered to each other.

[0044] During the process that the signal emitted from the transmitting end of the ultrasonic sensor 10 reaches the receiving end, the path of the ultrasonic beam of the ultrasonic sensor 10 covers the corresponding liquid level (i.e., Figure 2 a-a and b-b in it), and during the process that the ultrasonic beam travels from the transmitting end to the receiving end, when the liquid state at the corresponding liquid level of the ultrasonic sensor 10 is different, the degree of reflection or absorption of the ultrasonic wave is different, causing the ratio between the received signal intensity at the receiving end and the transmitted signal to change. Therefore, the liquid state at the corresponding liquid level of the ultrasonic sensor 10 can be determined according to the ratio between the transmitted signal intensity at the transmitting end and the received signal intensity at the receiving end.

[0045] Step S320: For any one of the ultrasonic sensors 10, if the ratio is greater than the first preset threshold, it is determined that the liquid level in the liquid level kettle 7 is not lower than the height of the ultrasonic sensor 10; if the ratio is between the first preset threshold and the second preset threshold, it is determined that the height of the foam in the liquid level kettle 7 is not lower than the height of the ultrasonic sensor 10; if the ratio is less than the second preset threshold, it is determined that the liquid level in the liquid level kettle 7 is lower than the height of the ultrasonic sensor 10; the first preset threshold is greater than the second preset threshold.

[0046] Specifically, for any one of the ultrasonic sensors 10, if the ratio is greater than the first preset threshold, it means that the ultrasonic sensor 10 detects liquid, and at this time, the liquid level in the liquid level kettle 7 is not lower than the height of the ultrasonic sensor 10; if the ratio is between the first preset threshold and the second preset threshold, it means that the ultrasonic sensor 10 detects foam, and at this time, the height of the foam in the liquid level kettle 7 is not lower than the height of the ultrasonic sensor 10; if the ratio is less than the second preset threshold, it means that the ultrasonic sensor 10 detects air (i.e., no liquid), and at this time, the liquid level in the liquid level kettle 7 is lower than the height of the ultrasonic sensor 10.

[0047] In the embodiment of the present application, the liquid level adjustment method of the blood purification device can accurately identify whether it is liquid, foam or air at the liquid level corresponding to the ultrasonic sensor according to the magnitude relationship between the ratio of the signal intensities of the transmitting end and the receiving end of the ultrasonic sensor and the first preset threshold and the second preset threshold, avoiding misjudging foam as liquid, reducing the misjudgment of the liquid level height detection in the liquid level pot, improving the accuracy of liquid level detection, and thus being able to adjust the liquid level height in the liquid level pot in a timely and accurate manner, keeping the liquid level height in the liquid level pot within a suitable range, which is beneficial to improving the safety during the blood purification process. In addition, the ultrasonic sensor in this embodiment can not only detect the liquid level, but also has the function of identifying the foam in the liquid level pot, without adding a special foam detector in the liquid level pot, which not only reduces the cost of the blood purification device, but also can accurately identify the foam in the liquid level pot, being beneficial to timely handling of the abnormal situation of excessive foam in the liquid level pot, and further improving the safety of the blood purification process.

[0048] On the basis of the above embodiment, as an optional implementation manner, if the first preset threshold is P1 and the second preset threshold is P0, then 80% ≤ P1 < 100% and 0 ≤ P0 ≤ 10%.

[0049] In this embodiment, the specific numerical ranges of the first preset threshold and the second preset threshold can be determined by the following method:

[0050] Completely empty the liquid level pot 7, detect the signal intensity of the receiving end, calculate the ratio between the signal intensities of the receiving end and the transmitting end, and determine the second preset threshold; fill the liquid level pot 7 with liquid and remove the bubbles or foam in the liquid level pot 7, detect the signal intensity of the receiving end, and calculate the ratio between the signal intensities of the receiving end and the transmitting end, and this ratio should be equal to 1 or approach 1; fill the liquid level pot 7 with liquid, slowly inject air into the liquid level pot 7 with a syringe with a needle, so that many tiny bubbles are formed in the liquid level pot 7. As the amount of injected air increases, the signal intensity of the receiving end will gradually change, causing the ratio between the signal intensities of the receiving end and the transmitting end to change within an interval, and determine the first preset threshold according to this interval.

[0051] Exemplarily, if the transmission signal of the transmitting end of the ultrasonic sensor 10 is 3 MHz (megahertz), then the liquid level pot 7 is completely emptied, and the signal intensity detected at the receiving end is 3 MHz × 10%, so the second preset threshold P0 = 10%; the liquid level pot 7 is filled with liquid, and the air bubbles or foams in the liquid level pot 7 are removed, and the signal intensity detected at the receiving end is close to 3 MHz or equal to 3 MHz; the liquid level pot 7 is filled with liquid, and air is slowly injected into the liquid level pot 7 with a syringe with a needle, so that many tiny air bubbles are formed in the liquid level pot 7. As the amount of injected air increases, the signal intensity at the receiving end will gradually change, and the signal intensity detected at the receiving end fluctuates between 3 MHz × (10% - 90%), and the first preset threshold P1 = 90% is determined. According to the above method, it can be determined that P1 = 90% and P0 = 10%. If the ratio is between 90% and 100%, it means that the ultrasonic sensor 10 detects liquid, and at this time, the liquid level in the liquid level pot 7 is not lower than the height of the ultrasonic sensor 10; if the ratio is between 10% and 90%, it means that the ultrasonic sensor 10 detects foam, and at this time, the height of the foam in the liquid level pot 7 is not lower than the height of the ultrasonic sensor 10; if the ratio is less than or equal to 10%, it means that the ultrasonic sensor 10 detects air, and at this time, the liquid level in the liquid level pot 7 is lower than the height of the ultrasonic sensor 10.

[0052] Based on the above embodiments, as an alternative embodiment, in combination with Figure 2 As shown, two ultrasonic sensors 10 are provided on the side wall of the liquid level pot 7. The two ultrasonic sensors 10 are respectively defined as the first ultrasonic sensor 11 and the second ultrasonic sensor 12. The second ultrasonic sensor 12 is located above the first ultrasonic sensor 11. Among them, the liquid level height corresponding to the first ultrasonic sensor 11 is b-b, and the liquid level height corresponding to the second ultrasonic sensor 12 is a-a. The structures and functions of the first ultrasonic sensor 10 and the second ultrasonic sensor 12 are the same. In this embodiment, by setting the first ultrasonic sensor 10 and the second ultrasonic sensor 12, the height of the liquid in the liquid level pot 7 is determined, and the liquid level in the liquid level pot 7 is adjusted. Specifically, both the first ultrasonic sensor 10 and the second ultrasonic sensor 12 are electrically connected to the processor, and the processor is further configured to call a computer program to execute the following liquid level adjustment method:

[0053] If the first ultrasonic sensor 11 detects air, it means that the liquid level in the liquid level pot 7 is lower than the height of the first ultrasonic sensor 11. It can be determined that the liquid level in the liquid level pot 7 is lower than the preset height. At this time, it is necessary to raise the liquid level in the liquid level pot 7 until the liquid level in the liquid level pot 7 is adjusted to the preset height;

[0054] Or, if the first ultrasonic sensor 11 detects air and the second ultrasonic sensor 12 detects foam, it indicates that the liquid level in the liquid level pot 7 is lower than the height of the first ultrasonic sensor 11, and the height of the foam in the liquid level pot 7 is not lower than the height of the second ultrasonic sensor 12. It can be determined that the liquid level of the liquid in the liquid level pot 7 is lower than the preset height. At this time, it is necessary to raise the liquid level of the liquid in the liquid level pot 7 until the liquid level of the liquid in the liquid level pot 7 is adjusted to the preset height;

[0055] Or, if the first ultrasonic sensor 11 detects foam and the second ultrasonic sensor 12 detects air, it indicates that the height of the foam in the liquid level pot 7 is not lower than the height of the first ultrasonic sensor 11, and the liquid level of the liquid in the liquid level pot 7 is lower than the height of the second ultrasonic sensor 12. It can be determined that the liquid level of the liquid in the liquid level pot 7 is lower than the preset height. At this time, it is necessary to raise the liquid level of the liquid in the liquid level pot 7 until the liquid level of the liquid in the liquid level pot 7 is adjusted to the preset height.

[0056] Based on the above embodiments, as an alternative embodiment, the processor is further configured to call a computer program to execute the following liquid level adjustment method:

[0057] If the second ultrasonic sensor 12 detects liquid, it indicates that the liquid level of the liquid in the liquid level pot 7 is not lower than the height of the second ultrasonic sensor 12. It can be determined that the liquid level of the liquid in the liquid level pot 7 is higher than the preset height. At this time, it is necessary to lower the liquid level of the liquid in the liquid level pot 7 until the liquid level of the liquid in the liquid level pot 7 is adjusted to the preset height.

[0058] Based on the above embodiments, as an alternative embodiment, the processor is further configured to call a computer program to execute the following liquid level adjustment method:

[0059] If both the first ultrasonic sensor 11 and the second ultrasonic sensor 12 detect foam, it indicates that the height of the foam in the liquid level pot 7 is not lower than the height of the first ultrasonic sensor 11, and the height of the foam in the liquid level pot 7 is not lower than the height of the second ultrasonic sensor 12. At this time, the foam in the liquid level pot 7 exceeds the preset range, and it is necessary to perform an operation to remove the foam.

[0060] In the embodiment of the present application, the first ultrasonic sensor 11 and the second ultrasonic sensor 12 are provided to detect the height of the liquid in the liquid level pot, and three situations are judged: the liquid level in the liquid level pot is too low, the liquid level in the liquid level pot is too high, and the foam in the liquid level pot exceeds the preset range. And according to the judgment result, the liquid level of the liquid in the liquid level pot is adjusted until the liquid level of the liquid in the liquid level pot is adjusted to the preset height, which is beneficial to further improving the safety during the blood purification process. In addition, in this embodiment, when the first ultrasonic sensor 11 and the second ultrasonic sensor 12 identify that the foam in the liquid level pot exceeds the preset range, the foam in the liquid level pot can be removed in time through the foam removal operation, avoiding the foam from entering the human body, which is beneficial to improving the safety during the blood purification process.

[0061] On the basis of the above embodiment, as an optional implementation manner, the foam removal operation includes:

[0062] Raise the liquid level of the liquid in the liquid level pot 7 until the liquid level pot 7 is full of liquid, and then lower the liquid level of the liquid in the liquid level pot 7 so that the liquid level of the liquid in the liquid level pot 7 is at the preset height. Thus, in this embodiment, by first raising the liquid level of the liquid in the liquid level pot 7, since the space of the liquid level pot 7 is limited, during the process of the gradual increase of the liquid height in the liquid level pot 7, the liquid will squeeze and break the foam, occupying the space of the foam, thereby raising the liquid level. When the liquid level pot 7 is full of liquid, the foam in the liquid level pot 7 does not exceed the preset range. Subsequently, lower the liquid level of the liquid in the liquid level pot 7 until the liquid level of the liquid in the liquid level pot 7 is at the preset height. Through this foam removal operation, not only can the foam in the liquid level pot 7 be better removed, but also no additional device is required for auxiliary adjustment, and the adjustment method is simple.

[0063] On the basis of the above embodiment, as an optional implementation manner, the blood purification device further includes a display screen. When the foam in the liquid level pot 7 exceeds the preset range, the processor is further configured to prompt the foam removal operation and the method of selecting the foam removal operation through the display screen. Specifically, when the foam in the liquid level pot 7 exceeds the preset range, a prompt "Whether to perform automatic foam removal operation" pops up on the display screen. If the user selects "Yes", the automatic foam removal operation is adopted. If the user selects "No", the manual foam removal operation is adopted.

[0064] Among them, the automatic foam removal operation refers to the processor executing the foam removal operation, that is, the processor raises the liquid level in the liquid level pot 7 until the liquid level pot 7 is full of liquid, and then lowers the liquid level of the liquid in the liquid level pot 7 so that the liquid level of the liquid in the liquid level pot 7 is at a preset height; the manual foam removal operation refers to manually removing the foam, that is, rotating out the peristaltic joint of the liquid level pot 7 connected to the control valve 16 so that the liquid level pot 7 communicates with the atmosphere, enabling the liquid level in the liquid level pot 7 to exhaust when the liquid level is raised, then raising the liquid level of the liquid in the liquid level pot 7 until the liquid level pot 7 is full of liquid, and then lowering the liquid level of the liquid in the liquid level pot 7 so that the liquid level of the liquid in the liquid level pot 7 is at a preset height, stopping the liquid level adjustment, and resetting the peristaltic joint of the liquid level pot 7 connected to the control valve 16.

[0065] In this embodiment, the preset range means that at least one of the first ultrasonic sensor 11 and the second ultrasonic sensor 12 does not detect foam, or neither the first ultrasonic sensor 11 nor the second ultrasonic sensor 12 detects foam. That is, only when both the first ultrasonic sensor 11 and the second ultrasonic sensor 12 detect foam, the foam in the liquid level pot 7 exceeds the preset range, and at this time, the foam removal operation needs to be performed.

[0066] On the basis of the above embodiment, as an alternative embodiment, the preset height is between the height of the first ultrasonic sensor 11 and the height of the second ultrasonic sensor 12, that is, the preset height is between b-b and a-a. Thus, the preset height being between the height of the first ultrasonic sensor 11 and the height of the second ultrasonic sensor 12 can make the liquid level of the liquid in the liquid level pot 7 within a suitable range, ensuring that the liquid level pot 7 can effectively play its role, avoiding the liquid level in the liquid level pot 7 being too high, making it difficult to detect the specific value of the venous pressure, and causing too much blood pressure when transfusing back into the patient's body, causing discomfort to the patient, and avoiding the liquid level in the liquid level pot 7 being too low, resulting in the risk of air bubbles in the blood transfused back into the patient's body.

[0067] On the basis of the above embodiment, as an alternative embodiment, the distance between the first ultrasonic sensor 11 and the second ultrasonic sensor 12 is 1 / 8 to 1 / 5 of the height of the liquid level pot 7. Thus, by setting the distance between the first ultrasonic sensor 11 and the second ultrasonic sensor 12 to 1 / 8 to 1 / 5 of the height of the liquid level pot 7, the liquid level of the liquid in the liquid level pot 7 can be better adjusted, avoiding the liquid level exceeding the preset height, and at the same time, further reducing the risk of air bubbles in the blood transfused back into the patient's body. As an alternative embodiment, the distance between the first ultrasonic sensor 11 and the second ultrasonic sensor 12 is 10 cm to 15 cm.

[0068] In this embodiment, combined with Figure 2 and Figure 4As shown, the blood purification device further includes an air pump 13 and a first branch pipe 14. The air pump 13 and the input end of the liquid level pot 7 are connected through the first branch pipe 14. A control valve 16 is provided on the first branch pipe 14. The pressure detector 17 is connected to the first branch pipe 14 through the control valve 16. The pressure detector 17 is used to detect the pressure in the liquid level pot 7. The venous clamp 9 is connected to the output end of the liquid level pot 7. Moreover, the blood pump 4, the venous clamp 9, the air pump 13, the control valve 16, and the pressure detector 17 are all electrically connected to the processor. The processor is further used to call a computer program to execute the following liquid level adjustment method:

[0069] When the liquid level pot 7 is connected to the air pump 13, turn on the air pump 13, the venous clamp 9, and the blood pump 4 to lower the liquid level in the liquid level pot 7.

[0070] Specifically, keep the blood pump 4 running and the venous clamp 9 open. Connect the liquid level pot 7 to the air pump 13 by adjusting the control valve 16. Turn on the air pump 13 and pump air into the liquid level pot 7 through the air pump 13 to slowly lower the liquid level in the liquid level pot 7. The signal intensity at the receiving end of the second ultrasonic sensor 12 gradually decreases. When the ratio between the signal intensity at the receiving end and the transmitting end of the second ultrasonic sensor 12 is less than a first preset threshold (i.e., the second ultrasonic sensor 12 detects foam or air), and at the same time the ratio between the signal intensity at the receiving end and the transmitting end of the first ultrasonic sensor 11 is greater than the first preset threshold (i.e., the first ultrasonic sensor 11 detects liquid), at this time, the liquid level in the liquid level pot 7 is adjusted to the preset height. Turn off the air pump 13, connect the liquid level pot 7 to the pressure detector 17 by adjusting the control valve 16, and use the pressure detector 17 to continuously monitor the pressure in the liquid level pot 7 to complete the adjustment of the liquid level in the liquid level pot 7.

[0071] In this embodiment, as shown in Figure 2 and Figure 4 the blood purification device further includes a second branch pipe 15. The second branch pipe 15 is located between the air pump 13 and the control valve 16 and is connected to the atmosphere. A bubble detector 8 is provided between the venous pot 7 and the venous clamp 9. The bubble detector 8 is electrically connected to the processor. The processor is further used to call a computer program to execute the following liquid level adjustment method:

[0072] When the liquid level pot 7 is connected to the second branch pipe 15, turn off the air pump 13 and the venous clamp 9, turn on the blood pump 4, and raise the liquid level in the liquid level pot 7.

[0073] Specifically, open the venous clamp 9. Connect the liquid level pot 7 and the second branch pipe 15 by adjusting the control valve 16, and disconnect the connection between the liquid level pot 7 and the pressure detector 17 to stop the pressure detector 17 from detecting the pressure in the liquid level pot 7. Close the air pump 13 and run the blood pump 4 to drive the liquid into the liquid level pot 7 until the bubble detector 8 detects no bubbles, indicating that the lower pipeline of the liquid level pot 7 is filled with liquid. Close the venous clamp 9 and keep the blood pump 4 running to slowly raise the liquid level in the liquid level pot 7. The signal intensity of the receiving end of the first ultrasonic sensor 11 gradually increases. When the ratio between the signal intensity of the receiving end and the transmitting end of the first ultrasonic sensor 11 is greater than the first preset threshold (i.e., the first ultrasonic sensor 11 detects liquid), and at the same time the ratio between the signal intensity of the receiving end and the transmitting end of the second ultrasonic sensor 12 is less than the first preset threshold (i.e., the second ultrasonic sensor 12 detects foam or air), the liquid level in the liquid level pot 7 is adjusted to the preset height at this time. Open the venous clamp 9 to keep the venous pipeline 2 unobstructed, and connect the liquid level pot 7 with the pressure detector 17 by adjusting the control valve 16. Real-time monitor the pressure in the liquid level pot 7 through the pressure detector 17 to complete the adjustment of the liquid level in the liquid level pot 7.

[0074] In this embodiment, when the liquid level in the liquid level pot 7 is at the preset height, the liquid level pot 7 is connected to the pressure detector 17, and the pressure in the liquid level pot 7 is real-time monitored through the pressure detector 17.

[0075] In this embodiment, the liquid level in the liquid level pot is adjusted in the above manner, which can stably and accurately adjust the liquid level in the liquid level pot to the preset height. It can not only avoid the pressure fluctuation caused during the liquid level adjustment process, but also avoid introducing air bubbles into the liquid level pot, improving the safety during the blood purification process. In addition, during the liquid level adjustment process, the blood pump maintains its running state, which can avoid blood coagulation and further improve the safety during the blood passing process.

[0076] On the basis of the above embodiment, as an alternative embodiment, the control valve 16 is a three-way valve, which has three interfaces respectively connected to the liquid level pot 7, the air pump 13 and the pressure detector 17. Thus, through the three interfaces of the three-way valve, the connection between the liquid level pot 7 and the air pump 13 or the connection between the liquid level pot 7 and the pressure detector 17 can be realized.

[0077] Based on the above embodiments, as an alternative embodiment, the diameter of the second branch pipe 15 is 0.5 mm to 1 mm, and the diameter of the first branch pipe 14 is 4 mm to 6 mm. Thus, by setting the diameter of the second branch pipe 15 to be much smaller than that of the first branch pipe 14, when the liquid level in the height-adjustable liquid level pot 7 is increased, the gas in the liquid level pot 7 can be slowly released into the atmosphere through the second branch pipe 15, effectively avoiding the rapid fluctuation of the liquid level in the liquid level pot 7 due to the rapid release of gas and generating bubbles. And when the liquid level in the liquid level pot 7 is decreased, the diameter of the second branch pipe 15 is much smaller than that of the first branch pipe 14. When the air pump 13 pumps gas into the liquid level pot 7, most of the gas can be pumped into the liquid level pot 7, without affecting the adjustment of the liquid level in the liquid level pot 7.

[0078] Based on the above embodiments, as an alternative embodiment, the processor is further configured to call a computer program to execute the following liquid level adjustment method:

[0079] If the bubble detector 8 detects bubbles in the venous line 2, the blood purification device issues an alarm prompt. The alarm prompt can be a sound alarm prompt or a light source alarm prompt to prompt the staff that there are bubbles in the venous line 2, so as to facilitate the staff to handle the bubbles in the venous line 2.

[0080] Figure 5 This is a schematic structural diagram of another embodiment of the blood purification device provided in the embodiments of the present application. Combining Figure 5 As shown, in the second aspect of this embodiment, a blood purification device 50 is provided, including a liquid level pot 7. At least one ultrasonic sensor 10 is provided on the side wall of the liquid level pot 7. The ultrasonic sensor includes a transmitting end and a receiving end, and the transmitting end and the receiving end are arranged horizontally on opposite sides of the liquid level pot;

[0081] The blood purification device further includes a memory 53 and a processor 51. The processor 51 is electrically connected to the memory 53 and at least one ultrasonic sensor 10 through a bus 52. The memory 53 stores program instructions executable by the processor. The processor 51 calls the program instructions to execute the liquid level adjustment method as described in the first aspect.

[0082] The blood purification device provided in the embodiments of the present application specifically executes the process of the above method embodiment. For details, refer to the content of the above-mentioned first aspect embodiment, which will not be repeated here. Since the blood purification device of the embodiments of the present application executes at least one of the above methods, the blood purification device at least includes all the beneficial effects of at least one of the above methods, which will not be repeated here.

[0083] Based on the above embodiments, as an alternative embodiment, the blood purification device 50 may further include a transceiver 54. It should be noted that in practical applications, the transceiver 54 is not limited to one, and the structure of the blood purification device 50 does not constitute a limitation to the embodiments of the present application.

[0084] The processor 51 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logic blocks, modules, and circuits described in connection with the disclosure of the present application. The processor 51 may also be a combination that implements computing functions, exemplarily including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0085] The bus 52 may include a path for transmitting information between the above components. The bus 52 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, Figure 5 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0086] The memory 53 can be a ROM (Read Only Memory), or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory), or other types of dynamic storage devices that can store information and instructions. It can also be an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0087] The memory 53 is used to store the application program code for executing the solution of this application and is controlled by the processor 51 for execution. The processor 51 is used to execute the application program code stored in the memory to implement the content shown in the foregoing method embodiments.

[0088] It should be understood that although the steps in the flowchart of the accompanying drawings are shown sequentially in the direction of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise clearly stated in this article, the execution of these steps has no strict order limit and can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same moment, but can be executed at different moments, and their execution order is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

[0089] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A method for adjusting the liquid level of a blood purification device, characterized in that: The blood purification device comprises a liquid level pot, a side wall of which is provided with at least one ultrasonic sensor, the ultrasonic sensor comprises a transmitting end and a receiving end, the transmitting end and the receiving end are arranged on two opposite sides of the liquid level pot in a horizontal direction; The liquid level adjustment method comprises: For any one of the ultrasonic sensors, respectively obtain the signal strengths of the transmitting end and the receiving end of the ultrasonic sensor, and determine the ratio between the signal strengths of the receiving end and the transmitting end; For any one of the ultrasonic sensors, if the ratio is greater than a first preset threshold, it is determined that the liquid level in the liquid level pot is not lower than the height of the ultrasonic sensor; if the ratio is between the first preset threshold and the second preset threshold, it is determined that the height of the foam in the liquid level pot is not lower than the height of the ultrasonic sensor; if the ratio is less than the second preset threshold, it is determined that the liquid level in the liquid level pot is lower than the height of the ultrasonic sensor; The first preset threshold is greater than the second preset threshold.

2. The liquid level adjustment method according to claim 1, characterized in that: The at least one ultrasonic sensor includes a first ultrasonic sensor and a second ultrasonic sensor, wherein the second ultrasonic sensor is located above the first ultrasonic sensor; The liquid level adjustment method further comprises: If the liquid level in the liquid level pot is lower than the height of the first ultrasonic sensor, it is determined that the liquid level in the liquid level pot is lower than a preset height, and the liquid level in the liquid level pot is raised until the liquid level in the liquid level pot is adjusted to a preset height; Or, if the liquid level in the liquid level pot is lower than the height of the first ultrasonic sensor, and the height of the foam in the liquid level pot is not lower than the height of the second ultrasonic sensor, it is determined that the liquid level in the liquid level pot is lower than a preset height, and the liquid level in the liquid level pot is adjusted up until the liquid level in the liquid level pot is adjusted to the preset height; Alternatively, if the height of the foam in the liquid level pot is not lower than the height of the first ultrasonic sensor, and the liquid level in the liquid level pot is lower than the height of the second ultrasonic sensor, it is determined that the liquid level in the liquid level pot is lower than a preset height, and the liquid level in the liquid level pot is adjusted up until the liquid level in the liquid level pot is adjusted to a preset height.

3. The liquid level adjustment method according to claim 2, characterized in that: The liquid level adjustment method further comprises: If the liquid level in the liquid level pot is not lower than the height of the second ultrasonic sensor, it is determined that the liquid level in the liquid level pot is higher than a preset height, and the liquid level in the liquid level pot is lowered until the liquid level in the liquid level pot is adjusted to the preset height.

4. The liquid level adjustment method according to claim 2, characterized in that: The liquid level adjustment method further comprises: If the height of the foam in the liquid level pot is not lower than the height of the first ultrasonic sensor, and the height of the foam in the liquid level pot is not lower than the height of the second ultrasonic sensor, the foam in the liquid level pot exceeds the preset range, and a foam clearing operation is performed.

5. The liquid level adjustment method according to claim 4, characterized in that: The foam removal operation comprises: The liquid level of the liquid in the liquid level pot is adjusted up until the liquid level pot is full of liquid, and then the liquid level of the liquid in the liquid level pot is adjusted down so that the liquid level of the liquid in the liquid level pot is at a preset height.

6. The liquid level adjustment method according to claim 1, characterized in that: The first preset threshold is P1, 80%≤P1<100%; the second preset threshold is P0, 0≤P0≤10%.

7. The liquid level adjustment method according to claim 2, characterized in that: The distance between the first ultrasonic sensor and the second ultrasonic sensor is 1 / 8 to 1 / 5 of the height of the liquid level pot.

8. The liquid level adjustment method according to any one of claims 2 to 5, characterized in that: The blood purification device further comprises an air pump, a blood pump and a venous clamp, wherein the air pump and the blood pump are both connected to the input end of the liquid level pot, and the venous clamp is connected to the output end of the liquid level pot; The liquid level in the liquid level pot is adjusted by: When the liquid level pot is connected to the air pump, the air pump, the venous clamp and the blood pump are turned on to lower the liquid level in the liquid level pot.

9. The liquid level adjustment method according to claim 8, characterized in that: The blood purification device further comprises a second branch pipe, the second branch pipe is located between the air pump and the liquid level pot, and the second branch pipe is connected to the atmosphere; The liquid level in the liquid level pot is also adjusted in the following ways: When the venous pot and the branch tube are connected, the air pump and the venous clamp are turned off, the blood pump is turned on, and the liquid level of the liquid in the liquid level pot is increased.

10. A blood purification device, characterized in that: It includes a liquid level pot, and at least one ultrasonic sensor is arranged on the side wall of the liquid level pot. The ultrasonic sensor includes a transmitting end and a receiving end, and the transmitting end and the receiving end are arranged on opposite sides of the liquid level pot in a horizontal direction. The blood purification equipment also includes a processor and a memory, and the processor is electrically connected to the memory and at least one ultrasonic sensor. The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the liquid level adjustment method as described in any one of claims 1 to 9.

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