Medical piezoelectric pump and control method thereof

Abstract

The invention provides a medical piezoelectric pump and a control method thereof, and relates to the medical field, and the medical piezoelectric pump comprises a pump body, a piezoelectric vibrator and a valve body; the pump body comprises an inner cavity, an inlet flow channel and an outlet flow channel, the inlet flow channel and the outlet flow channel are communicated with the inner cavity, the valve body is arranged on the inlet flow channel and the outlet flow channel so that the inlet flow channel and the outlet flow channel can be opened alternately, and a piezoelectric vibrator used for sealing the inner cavity is arranged on the pump body. The medical piezoelectric pump further comprises a first monitoring assembly and / or a second monitoring assembly, the first monitoring assembly is arranged in the inner cavity, the first monitoring assembly and the piezoelectric vibrator are oppositely arranged in a spaced mode, the second monitoring assembly is arranged on the valve body, and the first monitoring assembly and / or the second monitoring assembly are / is used for monitoring the flow of fluid and are / is in communication connection with the piezoelectric vibrator. According to the medical piezoelectric pump, the output precision of pumped fluid can be accurately controlled.

Description

Technical Field

[0001] The present application relates to the field of medical technology, and in particular to a medical piezoelectric pump and a control method thereof. Background Art

[0002] In the medical field, conventional delivery pumps often lack the ability to withstand interference, are complex in structure, and are bulky, making them difficult to adapt to the high-precision, high-stability drug delivery requirements of medical applications. However, miniature piezoelectric pumps are particularly well-suited for medical applications due to their compact size, high precision, low energy consumption, fast response, and immunity to electromagnetic interference.

[0003] Existing miniature piezoelectric pumps typically consist of a pump body and a piezoelectric vibrator. However, due to the material of the piezoelectric vibrator itself, the durability of the piezoelectric pump decreases after long-term operation, which in turn affects the accuracy of the fluid output of the piezoelectric pump. The performance of the piezoelectric pump is also affected by factors such as fluid backflow, bubbles in the fluid, and impurities in the fluid, which seriously reduce the output accuracy of the piezoelectric pump and limit its application in the medical field. Summary of the Invention

[0004] The purpose of this application is to solve the above technical problems and provide a medical piezoelectric pump and a control method thereof, so as to achieve precise control of the output accuracy of the pumped fluid. In order to achieve the above purpose, the technical solution of this application is as follows: In the first aspect, the present application provides a medical piezoelectric pump, comprising a pump body, a piezoelectric vibrator and a valve body; the pump body comprises an inner cavity, an inlet flow channel and an outlet flow channel, the inlet flow channel and the outlet flow channel are respectively connected to the inner cavity, the valve body is arranged in the inlet flow channel and the outlet flow channel so that the inlet flow channel and the outlet flow channel are alternately opened, and a piezoelectric vibrator for sealing the inner cavity is provided on the pump body. The medical piezoelectric pump also includes a first monitoring component and / or a second monitoring component, the first monitoring component is arranged in the inner cavity and is arranged relative to the piezoelectric vibrator at an interval, and the second monitoring component is arranged on the valve body. The first monitoring component and / or the second monitoring component are used to monitor the flow rate of the fluid and are communicatively connected to the piezoelectric vibrator.

[0005] In a second aspect, the present application provides a medical piezoelectric pump control method, which is applied to the above-mentioned medical piezoelectric pump, wherein the first monitoring component is used to generate a first sensor signal, and the second monitoring component is used to generate a second sensor signal. The method includes: determining the calibrated flow of the medical piezoelectric pump based on the preset volume of the inner cavity; obtaining the first sensor signal and / or the second sensor signal, and determining the inlet and outlet flow and / or inner cavity flow of the medical piezoelectric pump based on the first sensor signal and / or the second sensor signal; calculating the first average value of the inlet and outlet flow and the inner cavity flow, or calculating the second average value of the inlet and outlet flow, and determining the first average value or the second average value or the inner cavity flow as the actual flow; comparing the actual flow with the calibrated flow, if the actual flow is less than the calibrated flow, controlling the piezoelectric vibrator to increase the amplitude and / or vibration frequency, and if the actual flow is greater than the calibrated flow, controlling the piezoelectric vibrator to reduce the amplitude and / or vibration frequency.

[0006] Compared with the prior art, the medical piezoelectric pump and its control method of the present application have the following beneficial effects: The first monitoring component and the piezoelectric vibrator are arranged at relative intervals. When the piezoelectric vibrator vibrates and deforms, the first monitoring component can effectively monitor the flow rate changes of the fluid in the inner cavity. The arrangement positions of the piezoelectric vibrator and the first monitoring component are relative, ensuring the sensing sensitivity of the first monitoring component. The first monitoring component can monitor the changes in the flow rate of the inner cavity. The second monitoring component is arranged on the valve body. The valve body serves as a functional component that connects the inlet flow channel and the outlet flow channel with the inner cavity respectively. The second monitoring component can effectively monitor the changes in the flow rate of the fluid entering the inner cavity from the inlet flow channel and the changes in the flow rate of the fluid sent out of the inner cavity through the outlet flow channel, that is, the second monitoring component can monitor the changes in the inlet and outlet flows; the first monitoring component and / or the second monitoring component are communicated with the piezoelectric vibrator, and the piezoelectric vibrator adjusts its own amplitude and / or vibration frequency according to the changes in the flow rate of the inner cavity and / or the changes in the inlet and outlet flows to change the pumping flow rate of the medical piezoelectric pump, so that the medical piezoelectric pump meets the pumping flow rate requirements within the set time. Even if the piezoelectric vibrator has certain defects after long-term use, or there are bubbles or impurities in the fluid, the medical piezoelectric pump has a higher pumping flow rate accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 An exploded schematic diagram of a medical piezoelectric pump provided in an embodiment of the present application; Figure 2 for Figure 1 A schematic top view of a medical piezoelectric pump in one embodiment is shown; Figure 3 for Figure 2 One of the schematic cross-sectional views of a medical piezoelectric pump taken along line AA in one embodiment is shown; Figure 4 for Figure 2The second schematic diagram of the AA cross section of a medical piezoelectric pump in one embodiment is shown; Figure 5 for Figure 4 The structure diagram of the lower electrode shown in one embodiment; Figure 6 for Figure 5 A schematic cross-sectional view of a lower electrode in one embodiment is shown; Figure 7 for Figure 1 The structure diagram of the main body shown in one embodiment; Figure 8 for Figure 7 A schematic cross-sectional view of the main body in one embodiment is shown; Figure 9 for Figure 1 A disassembled schematic diagram of a valve body in one embodiment is shown; Figure 10 for Figure 1 A schematic side view of a valve body in one embodiment is shown; Figure 11 for Figure 10 The valve body shown is a schematic cross-sectional view of line BB in one embodiment; Figure 12 for Figure 9 The structure diagram of the valve plate shown in one embodiment; Figure 13 for Figure 12 A schematic cross-sectional view of a valve plate in one embodiment is shown; Figure 14 for Figure 12 A schematic diagram of a disassembled second monitoring assembly in one embodiment is shown; Figure 15 for Figure 14 A partial cross-sectional schematic diagram of a second monitoring assembly in one embodiment is shown; Figure 16 for Figure 1 A schematic cross-sectional view of a flow guide in one embodiment is shown; Figure 17 A flowchart of a medical piezoelectric pump control method provided in an embodiment of the present application.

[0008] Reference numerals: Pump body 1, main body 11, cover 12, inner cavity 13, mounting cavity 14, upper step 15, lower step 16; Piezoelectric vibrator 2; Valve body 3, valve plate 31, valve seat 32, valve cavity 33, elastic portion 34, first seat body 35, second seat body 36, elastic cavity 37, connecting ring 38, annular groove 39; Inlet flow channel 41, outlet flow channel 42, inlet portion 43, outlet portion 44, transition channel 45; First monitoring component 5, flexible carrier film 51, upper electrode 52, first electronegative film 53, lower electrode 54, electrode carrier 55, fixing ring 56; Second monitoring assembly 6, flexible base 61, first electrode 62, second electronegative film 63, second electrode 64, base cavity 65, first flexible substrate 66, second flexible substrate 67; Wire hole 71, wire groove 72, first wire hole 73, second wire hole 74, wire channel 75; The guide body 8 and the guide part 81; A first seal 91 , a second seal 92 , a third seal 93 , a fourth seal 94 , a fifth seal 95 , and a sixth seal 96 . DETAILED DESCRIPTION

[0009] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0010] Example 1 The present embodiment provides a medical piezoelectric pump for quantitatively pumping fluids, which can be medical agents. Due to the material limitations of the piezoelectric vibrator 2 in the piezoelectric pump, such as the brittleness, aging, and high-temperature performance limitations of the piezoelectric ceramic material, the piezoelectric pump will experience temperature increases during long-term operation, causing the durability of the piezoelectric vibrator 2 to decrease, leading to damage, which affects the accuracy of the piezoelectric pump's pumping flow rate. During the fluid delivery process, there may also be bubbles or impurities, which will affect the accuracy of the piezoelectric pump's pumping flow rate. Therefore, the present embodiment improves the piezoelectric pump so that even when the piezoelectric pump is subject to the above-mentioned influencing factors, it can still ensure the accuracy of the pumping flow rate, monitor the operating status of the piezoelectric pump in real time, and enhance the application scope of the piezoelectric pump in the medical field. This is described in detail below.

[0011] like Figures 1-4 、 Figure 11 As shown, the medical piezoelectric pump includes a pump body 1, a piezoelectric vibrator 2 and a valve body 3; the pump body 1 includes an inner cavity 13, an inlet flow channel 41 and an outlet flow channel 42, the inlet flow channel 41 and the outlet flow channel 42 are respectively connected to the inner cavity 13, the valve body 3 is arranged at the inlet flow channel 41 and the outlet flow channel 42 to realize the alternating opening of the inlet flow channel 41 and the outlet flow channel 42, and the pump body 1 is provided with a piezoelectric vibrator 2 for sealing the inner cavity 13.

[0012] Exemplarily, the piezoelectric vibrator 2 can vibrate back and forth by applying an AC voltage with a certain phase difference. Since the piezoelectric vibrator 2 seals the inner cavity 13, the piezoelectric vibrator 2 can be part of the inner wall of the inner cavity 13. The piezoelectric vibrator 2 changes the volume of the inner cavity 13, and the inlet flow channel 41 and the outlet flow channel 42 are opened alternately. When the inlet flow channel 41 is opened, the outlet flow channel 42 is closed, and when the outlet flow channel 42 is opened, the inlet flow channel 41 is closed, thereby realizing the function of the fluid entering the inner cavity 13 of the medical piezoelectric pump from the inlet flow channel 41 and then pumping out of the inner cavity 13 through the outlet flow channel 42.

[0013] Among them, the medical piezoelectric pump also includes a first monitoring component 5 and / or a second monitoring component 6. The first monitoring component 5 is arranged in the inner cavity 13 and is arranged relative to the piezoelectric vibrator 2. The second monitoring component 6 is arranged on the valve body 3. The first monitoring component 5 and / or the second monitoring component 6 are used to monitor the flow rate of the fluid and are communicated with the piezoelectric vibrator 2.

[0014] Exemplarily, the medical piezoelectric pump may include a first monitoring component 5 and may also include a second monitoring component 6. In this embodiment, the medical piezoelectric pump includes both the first monitoring component 5 and the second monitoring component 6, which has better monitoring effect and higher monitoring accuracy.

[0015] The first monitoring component 5 and the piezoelectric vibrator 2 are arranged relative to each other. When the piezoelectric vibrator 2 vibrates and deforms, the first monitoring component 5 can effectively monitor the flow rate changes of the fluid in the inner cavity 13. The arrangement positions of the piezoelectric vibrator 2 and the first monitoring component 5 are relative, ensuring the sensing sensitivity of the first monitoring component 5. The first monitoring component 5 can monitor the changes in the inner cavity flow rate, and the second monitoring component 6 is arranged on the valve body 3. The valve body 3 serves as a functional component for connecting the inlet flow channel 41 and the outlet flow channel 42 with the inner cavity 13 respectively. The second monitoring component 6 can effectively monitor the changes in the flow rate of the fluid entering the inner cavity 13 from the inlet flow channel 41 and the changes in the flow rate of the fluid sent out of the outlet flow channel 42 from the inner cavity 13, that is, the second monitoring component 6 can monitor the changes in the inlet and outlet flow rates; the first monitoring component 5 and / or the second monitoring component 6 are communicated with the piezoelectric vibrator 2, and the piezoelectric vibrator 2 adjusts its own amplitude and / or vibration frequency according to the changes in the inner cavity flow rate and / or the changes in the inlet and outlet flow rates to change the pumping flow rate of the medical piezoelectric pump, so that the medical piezoelectric pump meets the pumping flow rate requirements within the set time. Even if the piezoelectric vibrator 2 has certain defects after long-term use, or there are bubbles or impurities in the fluid, the medical piezoelectric pump has a high pumping flow rate accuracy.

[0016] For example, Figure 1As shown, the pump body 1 includes a main body 11 and a cover body 12. The cover body 12 is provided on the top of the main body 11, and the main body 11 and the cover body 12 are detachably connected; an inner cavity 13 is provided in the main body 11, and a piezoelectric vibrator 2 that seals the inner cavity 13 is provided on the top of the main body 11. The cover body 12 and the main body 11 relatively clamp the circumferential edge of the piezoelectric vibrator 2, and a window corresponding to the piezoelectric vibrator 2 is provided on the cover body 12 to provide a movable space for the reciprocating vibration of the piezoelectric vibrator 2.

[0017] like Figure 4 As shown, an upper step portion 15 is provided on the upper part of the circumferential side wall of the inner cavity 13, the piezoelectric vibrator 2 is provided on the upper step portion 15, and the cover body 12 is crimped onto the piezoelectric vibrator 2 and the upper step portion 15 to ensure the installation stability of the piezoelectric vibrator 2; a first sealing member 91 is provided between the top of the piezoelectric vibrator 2 and the cover body 12, and a second sealing member 92 is provided between the bottom of the piezoelectric vibrator 2 and the upper step portion 15, wherein the first sealing member 91 and the second sealing member 92 can be sealing rings to ensure the sealing of the inner cavity 13.

[0018] In one embodiment, the piezoelectric vibrator 2 is used to adjust the volume of the inner cavity 13 to alternately increase and decrease, the first monitoring component 5 and / or the second monitoring component 6 are deformed by pressure, the first monitoring component 5 generates a first sensor signal, and the second monitoring component 6 generates a second sensor signal. Both the first sensor signal and the second sensor signal are transmitted to a processor (not shown in the figure), and the processor controls the amplitude and / or vibration frequency of the piezoelectric vibrator 2.

[0019] like Figure 4 As shown, the first monitoring component 5 is located on the bottom wall of the inner cavity 13, and the second monitoring component 6 is arranged on the valve body 3. When the volume of the inner cavity 13 changes, the first monitoring component 5 is deformed by the force of the fluid. During the opening and closing process of the valve body 3, the second monitoring component 6 is deformed due to the pressure difference. The deformation of the second monitoring component 6 is not limited to the deformation of the valve body 3. The first sensor signal and / or the second sensor signal is transmitted to the processor, and the processor processes the first sensor signal and / or the second sensor signal to control the amplitude and / or vibration frequency of the piezoelectric vibrator 2, forming a closed-loop control of signal feedback between the first monitoring component 5 and / or the second monitoring component 6, the processor, and the piezoelectric vibrator 2, thereby realizing real-time and accurate monitoring of the fluid flow rate and precise control of the pumping flow rate of the medical piezoelectric pump.

[0020] In one embodiment, the first monitoring component 5 is disposed on the bottom wall of the inner cavity 13 , the piezoelectric vibrator 2 is the top wall of the inner cavity 13 , one end of the inner cavity 13 is connected to the inlet channel 41 , and the other end of the inner cavity 13 is connected to the outlet channel 42 .

[0021] For example, Figure 8As shown, the inner cavity 13, the inlet flow channel 41 and the outlet flow channel 42 are located on the same center line, so that the fluid can smoothly enter the inner cavity 13 from the inlet flow channel 41 and be pumped out from the outlet flow channel 42, reducing the resistance of the fluid flowing through the pump body 1 and ensuring the accuracy of the flow rate of the pumped fluid.

[0022] In one embodiment, the first monitoring component 5 includes a flexible supporting film 51, an upper electrode 52, a first electronegative film 53 and a lower electrode 54 arranged in sequence; the side of the flexible supporting film 51 facing away from the piezoelectric vibrator 2 is connected to the upper electrode 52, and the side of the lower electrode 54 facing the upper electrode 52 is connected to the first electronegative film 53, and a first gap is formed between the upper electrode 52 and the first electronegative film 53.

[0023] For example, Figure 3-Figure 8 As shown, the first monitoring component 5 can be a single-electrode triboelectric sensor; the flexible supporting film 51 can be made of polydimethylsiloxane (PDMS) or silicone rubber; the upper electrode 52 and the lower electrode 54 can be made of one of copper, aluminum, silver, and gold; the first electronegative film 53 can be made of one of fluorinated ethylene propylene (FEP), polytetrafluoroethylene (PTFE), polyimide (Kapton), and polyvinyl chloride (PVC).

[0024] When the piezoelectric vibrator 2 bends and rises, the volume of the inner cavity 13 increases, the valve body 3 at the inlet flow channel 41 opens, and the valve body 3 at the outlet flow channel 42 closes. Simultaneously, the flexible carrier film 51 bends and rises. The rising height of the flexible carrier film 51 is less than the rising height of the piezoelectric vibrator 2, effectively increasing the volume of the inner cavity 13. The upper electrode 52 rises with the flexible carrier film 51, the distance of the first gap changes, and the first sensing signal generated by the upper electrode 52 and the lower electrode 54 changes. The first sensing signal can be an electrical signal. The processor effectively obtains the first sensing signal and monitors the flow rate of the fluid in the inner cavity 13. Similarly, when the piezoelectric vibrator 2 bends and descends, the volume of the inner cavity 13 decreases, the valve body 3 at the inlet flow channel 41 closes, and the valve body 3 at the outlet flow channel 42 opens. Simultaneously, the flexible carrier film 51 bends and descends, and the upper electrode 52 follows the flexible carrier film 51 downward, the distance of the first gap changes, and the first sensing signal changes.

[0025] For example, Figure 5 、 Figure 6As shown, the first monitoring assembly 5 also includes an electrode carrier 55, which is disposed on the side of the lower electrode 54 facing away from the first electronegative film 53. A wire groove 72 is provided at the bottom of the electrode carrier 55, and a wire hole 71 is provided on the lower electrode 54, which connects to the wire groove 72. The lower electrode 54 is structured as a plurality of concentric rings, giving the first monitoring assembly 5 high sensing sensitivity. Each ring structure has a wire hole 71, and the main body 11 is provided with a first wire hole 73 connected to the wire groove 72. The wire of the lower electrode 54 is then led out through the wire hole 71 and the wire groove 72 through the first wire hole 73, thereby connecting the first monitoring assembly 5 to the processor.

[0026] Illustratively, the first monitoring assembly 5 further includes a fixing ring 56. A lower step 16 is provided at the lower portion of the circumferential sidewall of the inner cavity 13. The flexible carrier film 51 is disposed on the lower step 16. The fixing ring 56 is crimped onto the top of the circumferential edge of the flexible carrier film 51. The fixing ring 56 and the lower step 16 are detachably connected. A space for mounting the second monitoring assembly 6 is formed between the lower step 16 and the bottom wall of the inner cavity 13. The electrode carrier 55 is connected to the bottom wall of the inner cavity 13. The fixing ring 56 cooperates with the lower step 16 to stably position the flexible carrier film 51.

[0027] In one embodiment, the second monitoring component 6 includes a flexible base 61, a first electrode 62, a second electronegative film 63 and a second electrode 64; a base cavity 65 is provided in the flexible base 61, one side of the base cavity 65 is connected to the first electrode 62, and the other side of the base cavity 65 is connected to the second electrode 64, and the side of the second electrode 64 facing the first electrode 62 is connected to the second electronegative film 63, and a second gap is formed between the first electrode 62 and the second electronegative film 63.

[0028] For example, Figure 14 、 Figure 15 As shown, the second monitoring component 6 can be a contact-separation triboelectric sensor. Since the second monitoring component 6 is mounted on the valve body 3, which can be made of a flexible material, the volume change of the inner cavity 13 creates a pressure differential between the inner cavity 13 and the external space of the pump body 1, causing the valve body 3 to deform accordingly, thereby opening and closing the inlet flow channel 41 and the outlet flow channel 42, and thus bending the second monitoring component 6. When the flexible base 61 deforms, the distance of the second gap changes, and the second sensing signal generated by the first electrode 62 and the second electrode 64 changes. The second sensing signal can be an electrical signal. The processor effectively obtains the second sensing signal and monitors the flow rate of the fluid in the inlet flow channel 41 and the outlet flow channel 42.

[0029] Exemplarily, the second monitoring assembly 6 also includes a first flexible substrate 66 and a second flexible substrate 67. The two sides of the first flexible substrate 66 are connected to the first electrode 62 and the flexible base 61, respectively. The two sides of the second flexible substrate 67 are connected to the second electrode 64 and the flexible base 61, respectively. The arrangement of the first flexible substrate 66 and the second flexible substrate 67 enhances the deformation performance of the first and second electrodes 62, 64, reducing the probability of deformation damage to the first and second electrodes 62, 64. Both the first and second electrodes 62, 64 are interdigitated electrodes. The first electrode 62 is arranged along the length of the first flexible substrate 66, and the second electrode 64 is arranged along the length of the second flexible substrate 67. This results in high sensor sensitivity in the second monitoring assembly 6.

[0030] The first flexible substrate 66 can be made of silicone rubber or neoprene; the second flexible substrate 67 can be made of thermoplastic polyurethane (TPU) or flexible sponge. There is a difference in flexibility between the first flexible substrate 66 and the second flexible substrate 67, so that the first flexible substrate 66 and the second flexible substrate 67 have different bending degrees when deformed, making the second sensing signal more sensitive and effectively monitoring the changes in the fluid.

[0031] The first electrode 62 and the second electrode 64 can be made of one of copper, aluminum, silver, and gold; the second electronegative film 63 can be made of one of fluorinated ethylene propylene (FEP), polytetrafluoroethylene (PTFE), polyimide (Kapton), and polyvinyl chloride (PVC).

[0032] In one embodiment, mounting cavities 14 are provided on both sides of the pump body 1, and the inner cavity 13 is connected to the inlet flow channel 41 and the outlet flow channel 42 respectively through the mounting cavity 14. A valve body 3 is provided in the mounting cavity 14, and the valve body 3 includes a valve plate 31, and the valve plate 31 is movably abutted against the port of the inlet flow channel 41 and the port of the inner cavity 13 respectively.

[0033] For example, Figure 4 、 Figure 7 As shown, a transition channel 45 is provided between the inner cavity 13 and the mounting cavity 14, connecting the inner cavity 13 and the mounting cavity 14. Specifically, the cover 12 is disposed on top of the main body 11. The main body 11 and the cover 12 are connected to form the mounting cavity 14. The bottom of the cover 12 serves as the top wall of the mounting cavity 14. When the valve body 3 is installed, the valve body 3 is embedded in the mounting cavity 14. The cover 12 is connected to the main body 11, so that the cover 12 presses against the valve body 3 to achieve positioning.

[0034] Exemplarily, the inlet channel 41 has an inlet portion 43 extending into the corresponding mounting cavity 14. The inlet portion 43 is spaced apart from the transition channel 45 and arranged along the same centerline. A valve plate 31 movably abuts against the port of the inlet portion 43, that is, the port of the inlet channel 41, to enable opening and closing of the inlet channel 41. The transition channel 45 located between the inner cavity 13 and the outlet channel 42 has an outlet portion 44 extending into the corresponding mounting cavity 14. The outlet portion 44 is spaced apart from the outlet channel 42 and arranged along the same centerline. Another valve plate 31 movably abuts against the port of the outlet portion 44, that is, the port of the inner cavity 13, to enable opening and closing of the outlet channel 42. The valve plate 31 is generally disc-shaped, with a diameter greater than the port diameter of the inlet portion 43 and greater than the port diameter of the outlet portion 44.

[0035] In one embodiment, the valve body 3 also includes a valve seat 32, which defines a valve cavity 33 extending axially therethrough. The valve plate 31 is radially arranged in the valve cavity 33 and connected to the cavity wall of the valve cavity 33 through an elastic portion 34. A second monitoring component 6 is provided on the elastic portion 34.

[0036] For example, Figures 9-11 As shown, the valve body 3 also includes a connecting ring 38, which is concentrically arranged with the valve plate 31 and spaced apart on the outer periphery of the valve plate 31. The valve plate 31 is connected to the connecting ring 38 via an elastic portion 34. When the valve plate 31 is subjected to a force exerted by the fluid, both the valve plate 31 and the elastic portion 34 deform, allowing the second monitoring assembly 6 to monitor changes in the fluid flow rate.

[0037] The valve seat 32 comprises a first seat body 35 and a second seat body 36. The first seat body 35 and the second seat body 36 are connected and clamp a connecting ring 38, so that the valve plate 31 is radially positioned within the valve cavity 33, thereby achieving the flow-blocking effect of the valve plate 31. The first seat body 35 and the second seat body 36 are connected to form an annular groove 39 on the wall of the valve cavity 33. The connecting ring 38 is embedded in the annular groove 39 to maintain the stability of the installation of the valve plate 31. When the valve plate 31 is deformed by the force of the fluid, the connecting ring 38 also deforms slightly in response, without affecting the assembly precision of the connecting ring 38 and the annular groove 39. After being installed in the annular groove 39, the connecting ring 38 is less likely to loosen, thereby improving the durability of the valve body 3.

[0038] In one embodiment, elastic portions 34 extending to the cavity wall of the valve cavity 33 are respectively provided at both radial ends of the valve plate 31 . An elastic cavity 37 is provided in the elastic portion 34 , and a second monitoring assembly 6 is provided in the elastic cavity 37 .

[0039] For example, Figure 11-13As shown, the valve plate 31 and the elastic portion 34 are made of a flexible material, including one of silicone rubber, chloroprene rubber, and natural rubber. The elastic portion 34 deforms synchronously with the second monitoring assembly 6 when subjected to the force of the fluid. The elastic portion 34 is provided at both radial ends of the valve plate 31. When subjected to the force of the fluid, the valve plate 31 deforms into a roughly arc-shaped structure due to the pulling action of the two elastic portions 34. The two elastic portions 34 provide a good reset effect for the valve plate 31, ensuring that the valve plate 31 effectively seals against the inlet 43 and outlet 44 when closed.

[0040] A second wire-passing hole 74 is formed between the first seat body 35 and the second seat body 36. A radially arranged wiring channel 75 is provided in the valve plate 31. The wiring channel 75 is respectively connected to the two elastic chambers 37. Any elastic chamber 37 is connected to the second wire-passing hole 74. The second wire-passing hole 74 extends from the installation chamber 14 to the external space of the pump body 1, so that the second monitoring component 6 is led out from the two elastic chambers 37 through the second wire-passing hole 74 to the processor through a wire, thereby effectively transmitting the second monitoring signal.

[0041] Exemplarily, a third seal 93 is provided between the first seat body 35 and the second seat body 36, and a fourth seal 94 is provided between one axial end of the valve seat 32 and the cavity wall of the mounting cavity 14. The third seal 93 and the second seal 92 can be sealing rings, which are used to effectively seal the valve seat 32 and the mounting cavity 14 to prevent fluid overflow and affect the flow accuracy of the pumped fluid of the medical piezoelectric pump.

[0042] In one embodiment, a guide body 8 is provided in the installation cavity 14, and a guide portion 81 is provided on the guide body 8 that penetrates along the axial direction. The guide portion 81 connects the inner cavity 13 and the valve cavity 33. The diameter of the guide portion 81 in one installation cavity 14 gradually decreases from the inlet flow channel 41 to the inner cavity 13, and the diameter of the guide portion 81 in the other installation cavity 14 gradually decreases from the inner cavity 13 to the outlet flow channel 42.

[0043] like Figure 4 、 Figure 16 As shown, one guide body 8 is located at the end of the adjacent valve seat 32 facing away from the inlet flow channel 41, and the other guide body 8 is located at the end of the adjacent valve seat 32 facing the outlet flow channel 42. One axial end of the guide body 8 abuts against the valve seat 32, and the other axial end of the guide body 8 abuts against the wall of the mounting cavity 14, thereby connecting the guide portion 81 with the inner cavity 13 and the valve cavity 33, specifically, connecting the transition channel 45 and the valve cavity 33.

[0044] A fifth seal 95 is provided between the guide body 8 and the valve seat 32, and a sixth seal 96 is provided between the end of the guide body 8 facing away from the valve seat 32 and the cavity wall of the installation cavity 14. The fifth seal 95 and the sixth seal 96 are both sealing rings, thereby achieving sealing performance between the guide body 8 and the cavity wall of the installation cavity 14 to avoid fluid overflow.

[0045] The port diameters of the guide portion 81 at both ends along the axial direction are different. The guide portion 81 is roughly trumpet-shaped. When the fluid passes through the guide portion 81, it is diverted from the larger port to the smaller port of the guide portion 81, effectively reducing the flow resistance of the fluid and improving the pumping flow rate of the fluid.

[0046] Example 2 This embodiment provides a medical piezoelectric pump control method, which is applied to the medical piezoelectric pump in the above embodiment, wherein the piezoelectric vibrator 2 is used to adjust the volume of the inner cavity 13 to alternately increase and decrease, and the amplitude and vibration frequency of the piezoelectric vibrator 2 can be adjusted, which will not be described here. The first monitoring component 5 and / or the second monitoring component 6 are deformed by the action of the fluid, and the first monitoring component 5 generates a first sensor signal after the deformation, and the second monitoring component 6 generates a second sensor signal after the deformation. Figure 17 As shown, the specific methods include: S1. Determine the calibrated flow rate of the medical piezoelectric pump according to the preset volume of the inner cavity 13.

[0047] Since the volume of the inner cavity 13 can be adjusted, the maximum volume of the inner cavity 13 is the highest point of the piezoelectric vibrator 2 in the rising state, and the minimum volume of the inner cavity 13 is the lowest point of the piezoelectric vibrator 2 in the falling state. The flow rate output by the piezoelectric vibrator 2 in a pumping stroke is the difference between the maximum volume and the minimum volume. Among them, the preset volume of the inner cavity 13 is set to be larger than the minimum volume of the inner cavity 13 and smaller than the maximum volume of the inner cavity 13. It is understood that when the medical piezoelectric pump is in normal working condition, the fluid requires no bubbles or impurities and has not reached its maximum pumping flow rate. The medical piezoelectric pump still has room for amplitude adjustment. For example, the preset volume of the inner cavity 13 is set according to half of the difference between the maximum volume and the minimum volume, thereby determining the calibrated flow rate of the medical piezoelectric pump.

[0048] S2. Acquire a first sensor signal and / or a second sensor signal, and determine the inlet and outlet flow rates and / or the inner cavity flow rate of the medical piezoelectric pump in the current pumping stroke according to the first sensor signal and / or the second sensor signal.

[0049] When the medical piezoelectric pump is actually used, bubbles and / or impurities may exist in the fluid. At least two valve bodies 3 are provided in the pump body 1, one valve body 3 is provided at the inlet flow channel 41, and the other valve body 3 is provided at the outlet flow channel 42. The second monitoring components 6 on the two valve bodies 3 can effectively monitor the inlet and outlet flow rates. The second sensing signal includes multiple point sensing signals, which are determined by the arrangement position of the second monitoring component 6 on the valve body 3.

[0050] S3, calculating a first average value of the inlet and outlet flow rates and the inner cavity flow rate, or calculating a second average value of the inlet and outlet flow rates, and determining the first average value or the second average value or the inner cavity flow rate as the actual flow rate; When the pump body 1 is equipped with the first monitoring component 5, the internal cavity flow rate is used as the actual flow rate; when the pump body 1 is equipped with the second monitoring component 6, the second average value of the inlet and outlet flow rates is used as the actual flow rate; when the pump body 1 is equipped with the first monitoring component 5 and the second monitoring component 6, the first average value of the inlet and outlet flow rates and the internal cavity flow rate is used as the actual flow rate. The pump body 1 can be adapted to the above arrangement of monitoring components based on actual usage requirements. Among them, the simultaneous installation of the first monitoring component 5 and the second monitoring component 6 has a better monitoring effect.

[0051] S4. Compare the actual flow rate with the calibrated flow rate. If the actual flow rate is less than the calibrated flow rate, control the piezoelectric vibrator 2 to increase the amplitude and / or vibration frequency. If the actual flow rate is greater than the calibrated flow rate, control the piezoelectric vibrator 2 to reduce the amplitude and / or vibration frequency.

[0052] If the actual flow rate is equal to the calibrated flow rate, the medical piezoelectric pump is in normal working condition, that is, there are no impurities or bubbles in the fluid, and the piezoelectric vibrator 2 is in normal working condition and there is no damage problem. If the actual flow rate is less than the calibrated flow rate, there may be bubbles in the fluid, or the piezoelectric vibrator 2 is in an abnormal working state, the amplitude and / or vibration frequency of the piezoelectric vibrator 2 is lower than its normal working state, and the piezoelectric vibrator 2 is controlled to increase the amplitude and / or vibration frequency to ensure the output flow of the next one or more pumping strokes to make up for the insufficient flow of the current pumping stroke. If the actual flow rate is greater than the calibrated flow rate, there may be impurities in the fluid, or the piezoelectric vibrator 2 is in an abnormal working state, the amplitude and / or vibration frequency of the piezoelectric vibrator 2 is higher than its normal working state, and the piezoelectric vibrator 2 is controlled to reduce the amplitude and / or vibration frequency to ensure the output flow of the next one or more pumping strokes to make up for the excessive flow of the current pumping stroke. In addition to effectively judging the output of the fluid, the first monitoring component 5 and the second monitoring component 6 can also effectively monitor the working state of the piezoelectric vibrator 2 to ensure that the predetermined pumping flow is reached within a certain working time limit.

[0053] For example, the first monitoring component 5 can also monitor the actual pressure of the inner cavity 13, i.e., the maximum pressure detected by the first monitoring component 5 during a pumping stroke of the piezoelectric vibrator 2. The second monitoring component 6 can also monitor the actual outlet pressure, i.e., the maximum pressure of the pumped fluid detected by the first monitoring component 5 during a pumping stroke of the piezoelectric vibrator 2. Based on the preset volume of the inner cavity 13, the outlet calibration pressure and the inner cavity 13 calibration pressure can also be determined.

[0054] If the actual pressure in the inner cavity 13 is less than the rated pressure, there may be bubbles in the fluid, or the piezoelectric vibrator 2 is in an abnormal operating state, and the amplitude of the piezoelectric vibrator 2 is lower than its normal operating state, the output flow rate of the next one or more pumping strokes is ensured by controlling the piezoelectric vibrator 2 to increase its amplitude. If the actual pressure in the inner cavity 13 is greater than the rated pressure, there may be impurities in the fluid, or the piezoelectric vibrator 2 is in an abnormal operating state, and the amplitude of the piezoelectric vibrator 2 is higher than its normal operating state, the output flow rate of the next one or more pumping strokes is ensured by controlling the piezoelectric vibrator 2 to decrease its amplitude.

[0055] If the actual outlet pressure is lower than the rated outlet pressure, there may be bubbles in the fluid, or the piezoelectric vibrator 2 is in an abnormal operating state, and the amplitude of the piezoelectric vibrator 2 is lower than its normal operating state. The piezoelectric vibrator 2 is controlled to increase its amplitude to ensure the output flow rate of the next one or more pumping strokes. If the actual outlet pressure is higher than the rated outlet pressure, there may be impurities in the fluid, or the piezoelectric vibrator 2 is in an abnormal operating state, and the amplitude of the piezoelectric vibrator 2 is higher than its normal operating state. The piezoelectric vibrator 2 is controlled to reduce its amplitude to ensure the output flow rate of the next one or more pumping strokes.

[0056] Among them, the first monitoring component 5 and the second monitoring component 6 are used to monitor flow and / or pressure. According to the actual application of the medical piezoelectric pump, the flow and pressure can be considered separately according to the usage requirements, or they can be considered comprehensively to expand the application range of the medical piezoelectric pump.

[0057] In the description of this application, unless otherwise specified, directional terms such as "upper" and "lower" generally refer to the relative "upper" and "lower" of the corresponding component in the use state in the direction of gravity. "Inside" and "outside" are relative to the outline of the corresponding component itself.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0059] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0060] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0061] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A medical piezoelectric pump, characterized in that: The invention comprises a pump body (1), a piezoelectric vibrator (2) and a valve body (3); the pump body (1) comprises an inner cavity (13), an inlet flow channel (41) and an outlet flow channel (42); the inlet flow channel (41) and the outlet flow channel (42) are respectively connected to the inner cavity (13); the valve body (3) is arranged at the inlet flow channel (41) and the outlet flow channel (42) so that the inlet flow channel (41) and the outlet flow channel (42) are alternately opened; the pump body (1) is provided with a piezoelectric vibrator (2) for sealing the inner cavity (13); The medical piezoelectric pump further comprises a first monitoring component (5) and / or a second monitoring component (6), wherein the first monitoring component (5) is arranged in the inner cavity (13) and is spaced relative to the piezoelectric vibrator (2), and the second monitoring component (6) is arranged on the valve body (3), and the first monitoring component (5) and / or the second monitoring component (6) are used to monitor the flow rate of the fluid and are communicatively connected to the piezoelectric vibrator (2).

2. The medical piezoelectric pump according to claim 1, characterized in that: The first monitoring component (5) and / or the second monitoring component (6) are deformed by pressure, the first monitoring component (5) generates a first sensing signal, and the second monitoring component (6) generates a second sensing signal. Both the first sensing signal and the second sensing signal are transmitted to a processor, and the processor controls the amplitude and / or vibration frequency of the piezoelectric vibrator (2).

3. The medical piezoelectric pump according to claim 1, wherein: The first monitoring component (5) is arranged on the bottom wall of the inner cavity (13), the piezoelectric vibrator (2) is the top wall of the inner cavity (13), one end of the inner cavity (13) is connected to the inlet flow channel (41), and the other end of the inner cavity (13) is connected to the outlet flow channel (42).

4. The medical piezoelectric pump according to claim 1, characterized in that: The first monitoring component (5) comprises a flexible carrier film (51), an upper electrode (52), a first electronegative film (53) and a lower electrode (54) arranged in sequence; the side of the flexible carrier film (51) facing away from the piezoelectric vibrator (2) is connected to the upper electrode (52), the first electronegative film (53) is connected to the lower electrode (54), and a first gap is formed between the upper electrode (52) and the first electronegative film (53).

5. The medical piezoelectric pump according to claim 1, characterized in that: The second monitoring component (6) includes a flexible base (61), a first electrode (62), a second electronegative film (63) and a second electrode (64); a base cavity (65) is provided in the flexible base (61), one side of the base cavity (65) is connected to the first electrode (62), the other side of the base cavity (65) is connected to the second electrode (64), the side of the second electrode (64) facing the first electrode (62) is connected to the second electronegative film (63), and a second gap is formed between the first electrode (62) and the second electronegative film (63).

6. The medical piezoelectric pump according to claim 1, characterized in that: Mounting cavities (14) are provided on both sides of the pump body (1), and the inner cavity (13) is communicated with the inlet flow channel (41) and the outlet flow channel (42) respectively through the mounting cavities (14). The valve body (3) is provided in the mounting cavity (14), and the valve body (3) includes a valve plate (31), one of the valve plates (31) movably abuts against a port of the inlet flow channel (41), and the other valve plate (31) movably abuts against a port of the inner cavity (13).

7. The medical piezoelectric pump according to claim 6, characterized in that: The valve body (3) further comprises a valve seat (32), wherein the valve seat (32) is provided with a valve cavity (33) extending therethrough in the axial direction, and the valve plate (31) is radially arranged in the valve cavity (33) and connected to the cavity wall of the valve cavity (33) via an elastic portion (34), wherein the second monitoring component (6) is arranged on the elastic portion (34).

8. The medical piezoelectric pump according to claim 7, characterized in that: The valve plate (31) is provided with elastic parts (34) extending to the cavity wall of the valve cavity (33) at both ends in the radial direction, an elastic cavity (37) is provided in the elastic part (34), and the second monitoring component (6) is provided in the elastic cavity (37).

9. The medical piezoelectric pump according to claim 7, characterized in that: A guide body (8) is provided in the installation cavity (14), one of the guide bodies (8) is located at the end of the adjacent valve seat (32) away from the inlet flow channel (41), and the other guide body (8) is located at the end of the adjacent valve seat (32) facing the outlet flow channel (42), and the guide body (8) is provided with an axially penetrating guide portion (81), the guide portion (81) connects the inner cavity (13) and the valve cavity (33), the diameter of one guide portion (81) gradually decreases from the inlet flow channel (41) toward the inner cavity (13), and the diameter of the other guide portion (81) gradually decreases from the inner cavity (13) toward the outlet flow channel (42).

10. A medical piezoelectric pump control method, applied to the medical piezoelectric pump according to any one of claims 1 to 9, characterized in that: The first monitoring component (5) is used to generate a first sensing signal, and the second monitoring component (6) is used to generate a second sensing signal. The method includes: Determining a calibrated flow rate of the medical piezoelectric pump according to a preset volume of the inner cavity (13); Acquiring the first sensor signal and / or the second sensor signal, and determining the inlet and outlet flow rates and / or the inner cavity flow rate of the medical piezoelectric pump according to the first sensor signal and / or the second sensor signal; Calculating a first average value of the inlet and outlet flow rates and the inner cavity flow rate, or calculating a second average value of the inlet and outlet flow rates, and determining the first average value or the second average value or the inner cavity flow rate as an actual flow rate; The actual flow rate is compared with the calibrated flow rate. If the actual flow rate is less than the calibrated flow rate, the piezoelectric vibrator (2) is controlled to increase the amplitude and / or vibration frequency. If the actual flow rate is greater than the calibrated flow rate, the piezoelectric vibrator (2) is controlled to reduce the amplitude and / or vibration frequency.

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