Implantable miniature electromagnetic drive traveling wave blood pump

Abstract

The application relates to an implantable micro electromagnetic driving traveling wave type blood pump and belongs to the technical field of medical devices. The pump comprises an inlet section, a hollow pump body, a traveling wave driving mechanism and an outlet section. The two ends of the pump body are respectively provided with the inlet section and the outlet section, and the traveling wave driving mechanism is arranged between the inlet section and the outlet section. The traveling wave driving mechanism comprises a traveling wave plate arranged between the inlet section and the outlet section and used for pushing blood to move from the inlet section to the outlet section in a traveling wave mode along the axial direction of the pump body. The traveling wave plate is used as a driving device, so that hemolysis caused by high shear force is avoided, there is no flow dead zone, thrombus is not generated, and cavitation caused by pressure drop is avoided. The application can imitate output flow, can accurately and stably drain blood, and is more in line with the physiological characteristics of blood flow. The application is more convenient and comfortable for patients to use. Meanwhile, different blood stroke volumes can be provided by changing the frequency, so as to adapt to the blood supply requirements under different body metabolisms.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to an implantable micro electromagnetic drive traveling wave blood pump. BACKGROUND

[0002] The working mode of the commonly used blade type blood pump is to generate centrifugal force by impeller rotation to push blood circulation, thereby relieving the heart blood supply pressure. However, the rotation of the blade will generate high-intensity shear stress, which will cause damage to red blood cells and other substances in the blood, and further cause hemolysis; especially in the blood flow with relatively high consistency, the shear stress damage is particularly significant. The surface of the rotating blade is prone to cavitation due to pressure drop, so that small bubbles similar to those in boiling will be generated in the blood flow, which will directly affect the blood supply of the heart and the stability of the blood pump. At the same time, the blood as a non-Newtonian fluid has the characteristics of viscosity and is easy to agglomerate on the blade surface, thereby causing flow instability, and in severe cases, it can block the traditional blood pump and endanger life. Therefore, there is an urgent need in the technical field for a blood pump with low shear stress, no flow dead zone and no thrombus formation. SUMMARY

[0003] The purpose of the present application is to solve the technical problem of how to obtain a blood pump with low shear stress, no flow dead zone and no thrombus formation.

[0004] The present application adopts the following technical solution to solve the above technical problem: an implantable micro electromagnetic drive traveling wave blood pump, comprising an inlet section, a pump body, a traveling wave drive mechanism, an outlet section, a two-valve and a bionic three-valve; the two ends of the pump body are respectively provided with the inlet section and the outlet section, and the pump body is internally provided with the traveling wave drive mechanism, which comprises a traveling wave plate for moving blood from the inlet section to the outlet section and a plurality of electromagnetic coils for providing electromagnetic force support for the traveling wave plate.

[0005] Preferably, the pump body is hollow, the cross section of the through hole is square, and the traveling wave plate is arranged in the square through hole.

[0006] Preferably, the surface of the traveling wave plate is provided with a film.

[0007] Preferably, the traveling wave drive mechanism comprises an electromagnetic coil and a magnetic plate; the traveling wave plate is composed of a plurality of parallel magnetic plates arranged in sequence and a surface film, and the plate surface of the magnetic plate is parallel to the central axis of the pump body; the upper and lower sides of the plate surface of the magnetic plate are respectively provided with electromagnetic coils.

[0008] Preferably, the two side walls corresponding to the square through hole are respectively provided with parallel sliding grooves, the virtual plane where the two sliding grooves are located is perpendicular to the central axis of the pump body, and the magnetic plate is movably arranged between the two corresponding side sliding grooves; the plate surface of the magnetic plate is parallel to the top end surface and the bottom end surface of the square through hole.

[0009] Preferably, the top end face and the bottom end face of the square through hole are respectively provided with magnetic coils corresponding to the same magnetic plate; the upper and lower magnetic coils coincide with the central axis of the middle magnetic plate.

[0010] Preferably, the top end face and the bottom end face are provided with a plurality of magnetic coils parallel to the magnetic plate; the magnetic coils are sequentially and equidistantly arranged along the axial direction of the pump body.

[0011] Preferably, the top end face and the bottom end face of the square through hole are respectively provided with 12 groups of magnetic coils; the phase difference between every two adjacent groups of magnetic coils on the top end face is π / 6, the phase difference between every two adjacent groups of magnetic coils on the bottom end face is π / 6, and the phase difference of the electrical signals of the corresponding magnetic coils on the top end face and the bottom end face is φ; the traveling wave plate comprises 12 magnetic plates.

[0012] Preferably, a two-valve is arranged between the inlet section and the pump body to prevent blood backflow; the two-valve comprises a first valve leaf, a second valve leaf and a two-valve ring; the two-valve ring is provided with the first valve leaf and the second valve leaf which can be opened and closed.

[0013] Preferably, a bionic three-valve is arranged between the outlet section and the pump body to prevent blood backflow; the bionic three-valve comprises a third valve leaf, a fourth valve leaf, a fifth valve leaf and a three-valve ring; the three-valve ring is provided with the third valve leaf, the fourth valve leaf and the fifth valve leaf which can be opened and closed.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The traveling wave plate is used as a driving device in the present application, so that the hemolysis phenomenon caused by high shear force, flow dead zone, thrombosis and cavitation phenomenon caused by pressure drop can be avoided.

[0016] The whole machine alternately performs myocardial contraction and diastole, and the output flow is bionic, so that precise drainage and stable drainage can be achieved, and the blood flow physiological characteristics are more in line with the blood flow physiological characteristics. Therefore, the patient is more convenient and comfortable when using the traditional heart pump, and the whole machine can provide different blood stroke volumes by changing the frequency to adapt to the blood supply requirements under different body metabolisms. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a front isometric view of the implantable miniature electromagnetic driving traveling wave type blood pump structure of an embodiment of the present application;

[0018] Figure 2 It is a traveling wave plate structure schematic diagram of an embodiment of the present application;

[0019] Figure 3 It is an electromagnetic coil structure schematic diagram of an embodiment of the present application;

[0020] Figure 4 A schematic diagram of a chute structure according to an embodiment of the present application;

[0021] Figure 5 A schematic diagram of a two-leaf valve structure according to an embodiment of the present application;

[0022] A schematic diagram of a two-leaf valve structure according to an embodiment of the present application;

[0023] Figure 6 A schematic diagram of a bionic three-leaf valve structure according to an embodiment of the present application;

[0024] A schematic diagram of a bionic three-leaf valve structure according to an embodiment of the present application;

[0025] Figure 7 A schematic diagram of a bionic three-leaf valve structure according to an embodiment of the present application;

[0026] Reference signs: 1. Inlet section; 2. Two-leaf valve; 2.1 First leaf; 2.2 Second leaf; 2.3 Two-leaf valve ring; 3. Pump body; 4. Traveling wave plate; 4.1. Magnetic plate; 4.2 Thin film; 5. Electromagnetic coil; 6. Bionic three-leaf valve; 6.1. Third leaf; 6.2. Fourth leaf; 6.3. Fifth leaf; 6.4. Three-leaf valve ring; 7. Outlet section; 8. Chute. DETAILED DESCRIPTION

[0027] In order to make the present application more apparent and easy to understand, the preferred embodiments are described in detail below with reference to the accompanying drawings:

[0028] As Figures 1-7As shown, the present application provides an implantable miniature electromagnetic drive traveling wave type blood pump, comprising an inlet section 1, a pump body 3, a traveling wave drive mechanism and an outlet section 7; the two ends of the pump body 3 are respectively provided with the inlet section 1 and the outlet section 7, and the inside of the pump body is provided with the traveling wave drive mechanism, which comprises a traveling wave plate 4 for pushing the blood to move from the inlet section 1 to the outlet section 7 in a traveling wave motion along the axis of the pump body 3 and an electromagnetic coil 5 for providing electromagnetic force support for the traveling wave plate. The pump body 3 is hollow and is provided with a through hole with a square cross section, and the traveling wave plate 4 is arranged in the square through hole. The surface of the traveling wave plate 4 is provided with a film 4.2. The traveling wave drive mechanism comprises the electromagnetic coil 5 and the traveling wave plate 4; the traveling wave plate 4 comprises a plurality of parallel magnetic plates 4.1 arranged in sequence, the plate surface of the magnetic plate 4.1 is parallel to the central axis of the pump body 3, and the upper and lower sides of the plate surface of the magnetic plate 4.1 are respectively provided with the electromagnetic coil 5. The two side walls corresponding to the square through hole are respectively provided with parallel sliding grooves 8, the virtual plane where the two sliding grooves 8 are located is perpendicular to the central axis of the pump body 3, and the magnetic plate 4.1 is movably clamped between the corresponding two side sliding grooves 8; the plate surface of the magnetic plate 4.1 is parallel to the top end surface and the bottom end surface of the square through hole. The top end surface and the bottom end surface of the square through hole are respectively provided with the magnetic coil 5 corresponding to the same magnetic plate 4.1; the upper and lower two magnetic coils 5 coincide with the central axis of the middle magnetic plate 4.1. The top end surface and the bottom end surface are provided with a plurality of magnetic coils 5 parallel to the magnetic plate 4.1; the magnetic coils 5 are arranged in sequence at equal intervals along the axis of the pump body 3. The top end surface and the bottom end surface of the square through hole are respectively provided with 12 groups of magnetic coils 5; the phase difference between every two adjacent groups of magnetic coils 5 on the top end surface is π / 6, the phase difference between every two adjacent groups of magnetic coils 5 on the bottom end surface is π / 6, and the electrical signal phase difference of the corresponding magnetic coils 5 on the top end surface and the bottom end surface is φ; the traveling wave plate 4 comprises 12 magnetic plates 4.1. A two-valve 2 for preventing blood backflow is arranged between the inlet section 1 and the pump body 3; the two-valve 2 comprises a first valve leaf 2.1, a second valve leaf 2.2 and a two-valve valve ring 2.3; the two-valve valve ring 2.3 is provided with the first valve leaf 2.1 and the second valve leaf 2.2 which can be opened and closed. A bionic three-valve 6 for preventing blood backflow is arranged between the outlet section 7 and the pump body 3; the bionic three-valve 6 comprises a third valve leaf 6.1, a fourth valve leaf 6.2, a fifth valve leaf 6.3 and a three-valve valve ring 6.4; the three-valve valve ring 6.4 is provided with the third valve leaf 6.1, the fourth valve leaf 6.2 and the fifth valve leaf 6.3 which can be opened and closed.

[0029] The present application provides an implantable miniature electromagnetic drive traveling wave type blood pump; unlike the mechanism and structure of the conventional blade pump for conveying blood, the present application changes the driving device to a flexible magnetic traveling wave plate, which will not produce high shear stress, has no flow dead zone, will not produce thrombus, and has extremely low noise during operation. The traveling wave type blood pump alternately operates in accordance with myocardial contraction and diastole, has bionic output flow, and is more in line with the physiological characteristics of blood flow. At the same time, the whole machine can provide different blood stroke volumes by changing the frequency to adapt to the blood supply requirements under different body metabolisms.

[0030] The application provides an implantable micro electromagnetic driving traveling wave type blood pump, which comprises a pump body 3, a traveling wave plate 4, an electromagnetic coil 5, a two-leaf valve 2, a bionic three-leaf valve 6, an inlet section 1 and an outlet section 7.

[0031] The pump body 3 is a hollow cylinder with open ends, and a square through hole is arranged in the cross section; the traveling wave plate 4 is composed of multiple magnetic plates 4.1 and a surface covered film 4.2; the traveling wave plate 4 can be deformed to generate a traveling wave mode, and press the blood in the cavity of the pump body 3 to realize directional flow; the electromagnetic coil 5 comprises multiple groups, is averagely divided into two columns, and is uniformly distributed on the upper (lower) inner wall surface of the pump body 3 in the axial direction; with the periodic change of the current passing through the coil, the magnetic repulsion (attraction) force of each group of coils on the segmented magnetic plates 4.1 of the traveling wave plate 4 also changes in direction and size, so that the corresponding magnetic plates 4.1 are displaced in the radial direction, and the motion of all the segmented magnetic plates 4.1 is superimposed to make the traveling wave plate 4 generate a traveling wave mode; the inlet section 1 is located at one end of the pump body 3, the outlet section 7 is located at the other end of the pump body 3, the two-leaf valve 2 is arranged between the inlet section 1 and the pump body 3, and the two-leaf valve 2 is used for preventing the blood from flowing back to the blood vessel after passing through; the bionic three-leaf valve 6 is arranged between the outlet section 7 and the pump body 3, and the bionic three-leaf valve 6 is used for preventing the blood from flowing back to the pump body 3 after passing through.

[0032] The two-leaf valve 2 comprises a first leaf 2.1, a second leaf 2.2 and a two-leaf valve ring 2.3; the first leaf 2.1 and the second leaf 2.2 are arranged in the two-leaf valve ring 2.3, and the first leaf 2.1 and the second leaf 2.2 are the same in size and are separated in the radial direction. The first leaf 2.1 and the second leaf 2.2 can prevent the blood from flowing back to the blood vessel after passing through.

[0033] The bionic three-leaf valve 6 comprises a third leaf 6.1, a fourth leaf 6.2, a fifth leaf 6.3 and a three-leaf valve ring 6.4; the third leaf 6.1, the fourth leaf 6.2 and the fifth leaf 6.3 are the same in size and are separated in the radial direction. The third leaf 6.1, the fourth leaf 6.2 and the fifth leaf 6.3 can prevent the blood from flowing back to the pump body 3 after passing through.

[0034] The traveling wave plate 4 has a traveling wave structure of one vibration period, the multiple magnetic plates 4.1 are horizontally distributed along the traveling wave direction, and a thin film with good biocompatibility tightly wraps the magnetic plates 4.1, thereby forming a traveling wave plate 4. The axial length of the traveling wave plate 4 is slightly shorter than the axial length of the pump body 3.

[0035] The number of the magnetic plates 4.1 is 12, and the magnetic plates 4.1 are uniformly distributed along the traveling wave motion direction and always remain horizontal in the motion process. The number of the electromagnetic coils 5 should be twice that of the magnetic plates 4.1, and the electromagnetic coils 5 are averagely divided into two columns and are linearly and uniformly distributed on the upper (lower) inner wall surface of the pump body 3 in the axial direction, the axial spacing of the two columns of electromagnetic coils 5 is kept consistent, and the electromagnetic coils 5 are radially one-to-one corresponding.

[0036] There are 24 sets of electromagnetic coils 5, which are evenly divided into two columns. Each column includes 12 sets of electromagnetic coils. The 12 sets of electromagnetic coils are linearly and evenly distributed on the inner wall of the pump body 3 along the axial direction. The current passing through the two columns of electromagnetic coils 5 is in opposite directions.

[0037] Let the electromagnetic coils 5 in the first column from left to right be the first to the twelfth groups; let the electromagnetic coils in the second column from left to right be the thirteenth to the twenty-fourth groups.

[0038] Let the phase difference between the first and second groups, and between the second and third groups be π / 6, and so on. The phase difference between each adjacent pair of groups from the first to the twelfth group is π / 6.

[0039] The phase difference between groups 13 and 14, and between groups 14 and 15, is π / 6, and so on. From group 13 to group 24, the phase difference between each adjacent pair is π / 6. Each electromagnetic coil generates an electromagnetic force that causes the corresponding magnetic plate 4.1 to move radially. Due to the phase difference, all magnetic plates 4.1 cause the thin film to deform, generating a traveling wave plate mode. The traveling wave plate 4 compresses the blood in the cavity to achieve directional flow.

[0040] The wall thickness of the pump body 3, the pump body two-disc valve 2, and the bionic three-disc valve 6 is 1-1.5mm.

[0041] The pump body 3, traveling wave plate 4, two-disc valve 2, bionic three-disc valve 6, inlet section 1 and outlet section 7 are all made of flexible material.

[0042] This invention provides a driving method for an implantable micro electromagnetically driven traveling wave blood pump according to the above-described method, comprising the following steps:

[0043] An electrical signal is applied to each of the two sets of electromagnetic coils, such that the phase difference between any two adjacent groups in each set of electromagnetic coils is π / 6, the phase difference from the leftmost end to the rightmost end is 2π, and the phase difference of the electrical signals between the two sets of electromagnetic coils along the radial direction is φ.

[0044] Due to the phase difference, all magnetic plates 4.1 cause the thin film 4.2 to deform when they move. Because of the phase difference, the traveling wave plate 4 generates a traveling wave mode. The traveling wave mode of the traveling wave plate 4 compresses the blood in the cavity to achieve directional flow. By changing the excitation frequency and voltage of the electromagnetic coil 5, the flow rate of the output blood can be adjusted.

[0045] Example

[0046] like Figure 1 As shown, this is a preferred embodiment of an implantable micro electromagnetically driven traveling wave blood pump. The implantable micro electromagnetically driven traveling wave blood pump includes a pump body 3, a traveling wave plate 4, a hollow electromagnetic coil 5, a two-valve valve 2, a bionic three-valve valve 6, an inlet section 1, and an outlet section 7.

[0047] likeFigure 1 , Figure 3 and Figure 4 As shown, the pump body 3 is a hollow cylinder with openings at both ends. A through-hole with a square cross-section is provided inside the cylinder along its axial direction. Multiple grooves 8 are formed on the inner walls of both sides of the square through-hole. The grooves 8 are used to limit the axial displacement of the magnetic plates 4.1 in the traveling wave plate 4. The number of grooves 8 is twice the number of magnetic plates 4.1. Two rows of corresponding grooves 8 are evenly distributed axially on the inner wall surface and correspond one-to-one radially. Figure 7 As shown, a magnetic plate 4.1 that can move up and down is set between the two sliding grooves 8 on the left and right. When the magnetic plate 4.1 moves, the surface of the magnetic plate 4.1 is always parallel to the upper and lower end faces of the square through hole.

[0048] The electromagnetic coil 5 comprises multiple sets, evenly divided into two columns. Each column is uniformly distributed along the axial direction of the pump body 3 on the upper (lower) inner wall of the square through hole of the pump body 3. As the current passing through the coil changes periodically, the magnetic repulsion (attraction) force of each set of coils on the segmented magnetic plates 4.1 of the traveling wave plate 4 also changes in direction and magnitude, causing the corresponding magnetic plates 4.1 to shift in the radial direction of the pump body 3. The superposition of the movements of all segmented magnetic plates 4.1 can generate a traveling wave mode of the traveling wave plate 4, compressing the blood in the cavity of the pump body 3 to achieve directional flow. The material of the pump body 3 should preferably be an elastic material that can be implanted in the human body.

[0049] The inlet section 1 is located at one end of the pump body 3, and the outlet section 7 is located at the other end of the pump body 3. The two-valve 2 is set between the inlet section 1 and the pump body 3. The two-valve 2 is used to prevent blood from flowing back into the blood vessels after passing through. The bionic three-valve 6 is set between the outlet section 7 and the pump body 3. The bionic three-valve 6 is used to prevent blood from flowing back into the pump body 3 after passing through.

[0050] like Figure 5 As shown, the two-disc valve 2 is located between the inlet section 1 and the pump body 3, and includes a first disc 2.1, a second disc 2.2, and a two-disc valve ring 2.3; when the two-disc valve 2 is open, it is as follows: Figure 4 As shown on the left, the first leaflet 2.1 and the second leaflet 2.2 are separated radially, and blood enters the pump body 3 from the blood vessel through the two-valve valve 2; when the two-valve valve 2 is closed, as... Figure 4 As shown on the right, blood acts on the inner arc wall of the valve leaflets. The first leaflet 2.1 and the second leaflet 2.2 are crushed by the blood and squeezed against each other, preventing the blood in the cavity from flowing back into the blood vessel.

[0051] like Figure 6 As shown, the biomimetic three-disc valve 6 is located between the pump body 3 and the outlet section 7, and includes a third leaflet 6.1, a fourth leaflet 6.2, a fifth leaflet 6.3, and a three-disc valve ring 6.4. When the biomimetic three-disc valve 6 is open... Figure 5As shown on the left, the third leaflet 6.1, the fourth leaflet 6.2, and the fifth leaflet 6.3 are radially separated and close to the three-valve annulus 6.4. Blood is pumped into the blood vessel through the pump body 3 via the bionic three-valve valve 6; when the bionic three-valve valve 6 is closed, it is as follows: Figure 5 On the right side, blood acts on the curved surface of the valve leaflets. The valve leaflets are compressed by the blood flow, and the third valve leaflet 6.1, the fourth valve leaflet 6.2, and the fifth valve leaflet 6.3 squeeze each other, causing the bionic three-valve valve 6 to close and preventing blood from flowing back to the pump body 3.

[0052] In this embodiment, the third leaflet 6.1, the fourth leaflet 6.2, and the fifth leaflet 6.3 can be three arc-shaped leaflets with a central angle of 120°. The spatial curved surface of each leaflet can be obtained by performing Boolean operations on the ellipsoid and the cylindrical surface to form an ellipsoid composed of the third leaflet 6.1, the fourth leaflet 6.2, and the fifth leaflet 6.3. The surface with spatial curved surface formed within the three-lobe valve ring 6.4 is the cross-section of the ellipsoid. The biomimetic three-lobe valve 6 should be made of a flexible composite material with suitable mechanical properties, good biocompatibility, and low fouling performance.

[0053] In this embodiment, the left side of the pump body 3 is bonded to the outlet side of a coaxial two-lobed valve ring 2.3 of the same diameter, and the right side of the pump body 3 is bonded to a coaxial three-lobed valve ring 6.4 of the same diameter.

[0054] like Figure 3 As shown, the hollow electromagnetic coils 5 are evenly divided into two rows, each row being linearly and uniformly distributed along the axial direction on the upper (lower) inner wall surface of the square through hole in the pump body. The shape of a single coil is a planar racetrack shape. The axial spacing of the two rows of electromagnetic coils 5 is consistent, and they correspond one-to-one radially. The electromagnetic coils 5 can be bonded to the pump body 3 using implantable soft adhesive.

[0055] The electromagnetic coils 5 in the first column from left to right can be designated as groups 1 to 12; the electromagnetic coils 5 in the second column from left to right can be designated as groups 13 to 24. For groups 1 to 12, the phase difference between each adjacent group is π / 6; for groups 13 to 24, the phase difference between each adjacent group is also π / 6. The phase difference of the electrical signals between two corresponding groups of electromagnetic coils along the radial direction is φ.

[0056] As the current through the coil changes periodically, the magnetic repulsion (attraction) force of each group of coils on the segmented magnetic plates 4.1 of the traveling wave plate 4 also changes in direction and magnitude, causing the corresponding magnetic plates 4.1 to undergo regular displacement in the radial direction of the pump body 3.

[0057] like Figure 2As shown, the traveling wave plate 4 consists of multiple magnetic plates 4.1 and a thin film 4.2 enclosing the magnetic plates 4.1. The magnetic plates 4.1 are made of flexible magnetic material, and the shape of the magnetic plates 4.1 is a plate structure. The number of magnetic plates 4.1 is a multiple of 4, and the axial spacing of the multiple magnetic plates 4.1 is consistent. According to this embodiment, preferably, the number of magnetic plates 4.1 is 12, which are evenly distributed along the direction of traveling wave movement and remain horizontal during the movement. The magnetic plates 4.1 are used to receive external electrical signals to generate radial displacement. When all the magnetic plates 4.1 move, they cause the thin film 4.2 to deform. Due to the phase difference, the traveling wave plate generates a traveling wave mode. The traveling wave mode of the traveling wave plate 4 compresses the blood in the cavity to achieve directional flow; the blood flows from the inlet section 1 to the outlet section 7.

[0058] According to this embodiment, preferably, the inlet section 1, the two-valve 2, the pump body 3, the traveling wave plate 4, the bionic three-valve 6, and the outlet section 7 should be made of flexible biocompatible materials. The softness of the materials can effectively reduce the loss caused by fatigue, while not damaging the blood cell structure and ensuring the survival rate of blood cells during the delivery process.

[0059] According to this embodiment, preferably, in order to ensure the flexibility, regular deformation and fluid flow of the heart pump, the wall thickness of the pump body 3, the two-valve valve ring 2.3 and the three-valve valve ring 6.4 is preferably 1-1.5 mm.

[0060] Working principle of this invention:

[0061] An electrical signal with a phase difference of π / 6 is applied to multiple sets of electromagnetic coils 5. The phase difference between each adjacent pair of the first to twelfth sets is π / 6, and the phase difference between each adjacent pair of the thirteenth to twenty-fourth sets is also π / 6. The phase difference between the electrical signals of two corresponding sets of electromagnetic coils along the radial direction is φ. Based on the human body's blood flow supply and demand, experiments are conducted in the π / 2 range to obtain the value of φ under conditions matching the human body's supply and demand. Each set of electromagnetic coils 5 excites the displacement of the corresponding magnetic plate 4.1 in the radial direction. When all magnetic plates 4.1 move, they cause the membrane 4.2 to deform. Due to the phase difference, the traveling wave plate 4 generates a traveling wave mode. The traveling wave mode of the traveling wave plate 4 compresses the blood within the pump body 3, achieving directional flow. Blood enters the blood pump through inlet section 1, the two-valve valve 2 opens, and the bionic three-valve valve 6 at outlet section 7 closes, allowing blood in the blood vessels of inlet section 1 to enter pump body 3. Subsequently, the traveling wave plate 4 undergoes regular topographic deformation, forming a traveling wave mode. Over time, the traveling wave plate 4 compresses the blood within the chamber, continuously propelling it forward axially. The magnetic plates 4.1 within the traveling wave plate 4 satisfy the optimal phase difference φ for blood flow supply and demand in the human body. Their interaction allows them to apply energy to the blood radially, causing the blood to move along the direction of the traveling wave. When the blood reaches the bionic three-valve valve 6, the resistance of the valve body converts kinetic energy into static pressure energy. When the static pressure energy exceeds the opening pressure energy of the three valves of the bionic three-valve valve 6, the bionic three-valve valve 6 opens, and the heart pumps blood into the blood vessels. At the end of the ejection phase, the bionic three-valve valve 6 closes, continuing the next cycle.

[0062] This invention also discloses a driving method for the flexible traveling wave driven cardiac micropump, comprising the following steps:

[0063] An electrical signal with a phase difference of π / 6 is applied to multiple sets of electromagnetic coils 5. The phase difference between each adjacent pair of the first to twelfth sets is π / 6, and the phase difference between each adjacent pair of the thirteenth to twenty-fourth sets is also π / 6. The phase difference between the electrical signals of two corresponding sets of electromagnetic coils along the radial direction is φ. Each set of electromagnetic coils 5 excites the magnetic plate 4.1 corresponding to it in the radial direction to displace. When all magnetic plates 4.1 move, they cause the diaphragm 4.2 to deform. Due to the phase difference, the traveling wave plate 4 generates a traveling wave mode. The traveling wave mode of the traveling wave plate 4 compresses the blood in the pump body 3 cavity, achieving directional flow. Simultaneously, the two-valve valve 2 in the inlet section 1 and the bionic three-valve valve 6 in the outlet section 7 passively open and close. The two-valve valve 2 prevents blood from flowing back into the blood vessels, and the bionic three-valve valve 6 prevents blood from flowing back into the pump body 3. The two-valve valve 2 and the bionic three-valve valve 6 prevent backflow of the medium, increase the static pressure energy of the medium, and improve transmission performance. By changing the excitation frequency and voltage of electromagnetic coil 5, the flow rate of output blood can be adjusted. The heart pump can provide different stroke volumes to meet the different states of patients and the body's metabolism.

[0064] Specifically, blood enters the blood pump through inlet section 1, the two-valve valve 2 opens, and the bionic three-valve valve 6 at outlet section 7 closes, allowing blood in the blood vessels of inlet section 1 to enter pump body 3. Subsequently, the traveling wave plate 4 undergoes regular topographic deformation, forming the vibration mode of a traveling wave. Over time, the traveling wave plate 4 compresses the blood within the chamber, continuously propelling it forward axially. The magnetic plates 4.1 in the traveling wave plate 4 satisfy the optimal phase difference φ for blood flow supply and demand in the human body. Their interaction allows them to apply energy to the blood radially, causing the blood to move along the direction of the traveling wave. When the blood reaches the bionic three-valve valve 6, the resistance of the valve body converts kinetic energy into static pressure energy. When the static pressure energy exceeds the opening pressure energy of the three valves, the bionic three-valve valve 6 opens, and the heart pumps blood into the blood vessels. At the end of the ejection phase, the bionic three-valve valve 6 closes, continuing the next cycle.

[0065] In this embodiment, two rows of electromagnetic coils 5 are evenly distributed on the upper and lower inner walls of the pump body 3; the traveling wave plate 4 is located at the center inside the pump body; the flexible two-disc valve 2 is located at the pump body inlet section 1, and the flexible bionic three-disc valve 6 is located at the pump body outlet section 7. Electrical signals with a time difference of π / 6 and π / 6+φ are applied to the electromagnetic coils, thereby causing the magnetic plate 4.1 to drive the traveling wave plate 4 to generate traveling waves with a specific timing, compressing the blood in the pump body 3 cavity to achieve directional flow.

[0066] All parts of this cardiac micropump are made of flexible materials, resulting in low shear force between blood and the wall during operation, preventing hemolysis, eliminating flow dead zones, and ensuring high survival rates of blood cells during transport. Following the alternation of myocardial contraction and relaxation, the output flow is biomimetic, allowing for precise and stable drainage that better matches the physiological characteristics of blood flow. Therefore, it is more convenient and comfortable for patients to use than traditional cardiac pumps. Furthermore, the device can adjust its frequency to provide different stroke volumes, adapting to varying blood supply requirements under different metabolic conditions.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An implantable miniature electromagnetically driven traveling wave blood pump, characterized in that, It includes an inlet section, a hollow pump body, a traveling wave drive mechanism, and an outlet section; the pump body has an inlet section and an outlet section at both ends, and a traveling wave drive mechanism is provided between the inlet section and the outlet section. The traveling wave drive mechanism includes a traveling wave plate located between the inlet section and the outlet section, which can move in a traveling wave motion along the pump body axis to push blood from the inlet section to the outlet section. The traveling wave driving mechanism includes multiple sets of electromagnetic coils. Electrical signals with a phase difference of π / 6 are applied to the multiple sets of electromagnetic coils respectively. The phase difference between each adjacent pair of the first to twelfth groups is π / 6, and the phase difference between each adjacent pair of the thirteenth to twenty-fourth groups is π / 6. The phase difference of the electrical signals of the two corresponding sets of electromagnetic coils along the radial direction is φ. Based on the human body's blood flow supply and demand, the value of φ is obtained in the π / 2 range under working conditions that match the human body's supply and demand. Each set of electromagnetic coils excites the displacement of the magnetic plate corresponding to it in the radial direction. When all the magnetic plates move, they cause the thin film to deform. Due to the phase difference, the traveling wave plate generates a traveling wave mode. The traveling wave mode of the traveling wave plate compresses the blood in the pump body to achieve directional flow. Blood enters the blood pump through the inlet section, the two-valve valve opens, and the bionic three-valve valve in the outlet section closes, allowing blood in the blood vessels in the inlet section to enter the pump body; then the traveling wave plate undergoes regular topographic deformation, forming the vibration mode of the traveling wave, and as time goes by, the traveling wave plate compresses the blood in the chamber and continuously propels it forward along the axial direction; The magnetic plates in the traveling wave plate satisfy the phase difference φ of the optimal conditions for blood flow supply and demand in the human body. They work together to apply energy to the blood in the radial direction, so that the blood moves along the direction of the traveling wave. When blood reaches the bionic three-valve valve, the kinetic energy is converted into static pressure energy due to the obstruction of the valve body. When the static pressure energy is greater than the opening pressure energy of the three valves of the bionic three-valve valve, the bionic three-valve valve opens and the heart pumps blood into the blood vessels. At the end of ejaculation, the bionic three-valve valve closes, and the next cycle begins.

2. The implantable miniature electromagnetically driven traveling wave blood pump according to claim 1, characterized in that, The pump body has a through hole with a square cross-section, and the traveling wave plate passes through the square through hole.

3. The implantable miniature electromagnetically driven traveling wave blood pump according to claim 1, characterized in that, The surface of the traveling wave plate is covered with a film.

4. An implantable micro electromagnetically driven traveling wave blood pump according to claim 2, characterized in that, The traveling wave drive mechanism includes an electromagnetic coil and a magnetic plate; the traveling wave plate includes multiple parallel magnetic plates arranged in sequence, with the surface of the magnetic plate parallel to the central axis of the pump body; electromagnetic coils are respectively provided on the upper and lower sides of the surface of the magnetic plate.

5. An implantable miniature electromagnetically driven traveling wave blood pump according to claim 4, characterized in that, Parallel grooves are provided on the two side walls corresponding to the square through hole. The virtual plane where the two grooves are located is perpendicular to the central axis of the pump body. The magnetic plate is movably locked between the corresponding two side grooves. The surface of the magnetic plate is parallel to the top and bottom surfaces of the square through hole.

6. An implantable micro electromagnetically driven traveling wave blood pump according to claim 5, characterized in that, The top and bottom surfaces of the square through hole are respectively provided with magnetic coils corresponding to the same magnetic plate; the upper and lower magnetic coils coincide with the central axis of the middle magnetic plate.

7. An implantable miniature electromagnetically driven traveling wave blood pump according to claim 6, characterized in that, Multiple magnetic coils parallel to the magnetic plate are provided on the top and bottom surfaces; the magnetic coils are arranged equidistantly along the pump body axis.

8. An implantable miniature electromagnetically driven traveling wave blood pump according to claim 7, characterized in that, The top and bottom surfaces of the square through hole are respectively provided with 12 sets of magnetic coils; the phase difference between each pair of adjacent magnetic coils on the top surface is π / 6, the phase difference between each pair of adjacent magnetic coils on the bottom surface is π / 6, and the phase difference of the electrical signals of the corresponding magnetic coils on the top and bottom surfaces is φ; the traveling wave plate includes 12 magnetic plates.

9. An implantable miniature electromagnetically driven traveling wave blood pump according to claim 1, characterized in that, A two-valve valve is provided between the inlet section and the pump body to prevent blood backflow; the two-valve valve includes a first leaflet, a second leaflet and a two-valve valve ring; the two-valve valve ring is provided with a first leaflet and a second leaflet that can be opened and closed.

10. An implantable micro electromagnetically driven traveling wave blood pump according to claim 1, characterized in that, A biomimetic three-valve valve to prevent blood backflow is provided between the outlet section and the pump body; the biomimetic three-valve valve includes a third leaflet, a fourth leaflet, a fifth leaflet and a three-valve valve ring; the three-valve valve ring is provided with an openable and closable third leaflet, a fourth leaflet and a fifth leaflet.

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