Ventricular auxiliary device for right heart of child

Abstract

The invention provides a ventricular auxiliary device for the right heart of a child, and belongs to the field of medical instruments. The problems that the flowing direction of accelerated blood is disordered, heat is still generated by friction, and thrombus is prone to being abraded after being used for a long time are solved. A ventricular auxiliary device for the right heart of a child comprises a rotor and a shell, the shell is in a hollow column shape with two open ends, magnet check blocks are arranged at the two ends of the shell, the rotor is assembled between the magnet check blocks, the rotor suspends between the two magnet check blocks through magnetic force, a second channel is formed in the middle of the magnet check blocks, and a first channel is formed in the middle of the rotor. The diameter of the first channel is the same as that of the second channel, the diameter of the magnet check block is the same as that of the rotor, and the rotor can be driven by in-vitro magnetic coupling driving equipment to rotate. The blood flow path is simplified, the change of the blood flow direction is reduced, the generated heat is further reduced, thrombus is prevented, and abrasion is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a ventricular assist device for the right heart of a child. Background Art

[0002] The research and development of cardiac assist circulation and the auxiliary pumps used in it have a history of several decades. Diaphragm pumps, centrifugal pumps, and axial flow pumps have been developed and applied to open heart surgery, low cardiac output cardiac surgery, and auxiliary circulation during the transition period of heart transplantation.

[0003] In a ventricular assist device for the right heart of a child with application number CN202111617533.0, the rotor 2 is driven to rotate under the drive of an external magnetic coupling drive device, so that the flow rate of blood is increased. It can be seen from the drawings of the specification that the rotor 2 occupies most of the space in the pump barrel 1. When blood enters the inside of the pump barrel 1 from the liquid inlet 3, it needs to flow through the vertebral body 23 first, then through the cylindrical part 22, and finally through the second shell 15, and finally out of the liquid outlet 4. It can be seen that the path through which the blood flows is relatively complicated. Although it has an effect of increasing the flow rate of blood, it is easy to cause disorder in the flow direction of blood, which may seriously cause blood circulation disorders or qi and blood disorder. In addition, the rotating shaft 19 is connected to the support member 5 through the bearing 6, and the rotating shaft 19 can rotate in the bearing 6, and the heat generation is reduced by the bearing 6, thereby reducing the possibility of thrombosis. However, when the bearing 6 in the technical solution rotates, a small part of the mechanical energy will still be converted into heat energy, and long-term use may still cause thrombosis, and the bearing will wear. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a ventricular assist device for the right heart of a child, which has the advantages of simplifying the blood flow path, reducing changes in the direction of blood flow, and further reducing the heat generated, preventing thrombosis, and reducing wear. It solves the problem of blood flow disorder after acceleration, which may seriously lead to blood circulation disorders or blood circulation disorder, and a small amount of heat is still generated. After long-term use, thrombosis and wear are still caused.

[0005] (II) Technical solution In order to achieve the above-mentioned purpose of simplifying the blood flow path, reducing the change in blood flow direction and further reducing the heat generated, preventing thrombosis and reducing wear, the present invention provides the following technical solutions: A ventricular assist device for the right heart of a child, comprising a rotor and a shell, the shell being a columnar shape with openings at both ends and a hollow interior, magnet blocks being provided at the openings at both ends of the shell, a rotor being assembled between the magnet blocks, the rotor being suspended between the two magnet blocks by magnetic force, a channel two being provided in the middle of the magnet blocks, a channel one being provided in the middle of the rotor, the diameters of the channel one and the channel two being the same, the diameter of the magnet block being the same as the diameter of the rotor, and the rotor being driven by an external magnetic coupling drive device to rotate.

[0006] Preferably, the shell comprises an outer shell and an inner shell, the outer shells extend from both ends of the shell to the middle, and an embedded annular groove is formed between the outer shell and the inner shell.

[0007] Preferably, a magnetic shielding ring one and a magnetic shielding ring two are respectively embedded and installed in the embedded ring grooves, and a retaining ring is installed at the opening of the embedded ring grooves, and the retaining ring is used to fix the magnetic shielding ring one and the magnetic shielding ring two.

[0008] Preferably, a portion of the inner shell is exposed between the two retaining rings.

[0009] Preferably, the rotor includes a transmission shaft, an axial impeller is provided on the upper outer portion of the transmission shaft, an axial guide wheel is provided on the middle outer portion of the transmission shaft, the axial guide wheel and a portion of the inner shell exposed between the two retaining rings are located at the same height, and both ends of the transmission shaft are respectively provided with insertion ends with an outer diameter smaller than the outer diameter of the transmission shaft.

[0010] Preferably, an inner surface of the channel 1 is provided with an inner impeller.

[0011] Preferably, a magnet stopper bracket is provided on the outer side of the magnet stopper, and the magnet stopper is fixedly connected to the shell through the magnet stopper bracket.

[0012] Preferably, an insertion groove is provided at one end of the magnet stopper located on the inner side of the shell, the inner diameter of the insertion groove is larger than the outer diameter of the insertion end, and the two insertion ends of the transmission shaft are respectively assembled in the insertion grooves of the two magnet stoppers.

[0013] Preferably, the insertion end and the insertion slot are magnetic and repel each other.

[0014] Preferably, the axial guide wheels are magnetic, and a portion of each axial guide wheel close to the transmission shaft is an S (N) pole, and a portion of each axial guide wheel away from the transmission shaft is an N (S) pole.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides a ventricular assist device for the right heart of a child, which has the following beneficial effects: The ventricular assist device for the right heart of a child is used by the mutual cooperation of a rotor, a shell, and a magnet block. The ventricular assist device for the right heart of a child is implanted in the child's body. After the implantation is completed, the rotor is rotated by the drive of an external magnetic coupling drive device. Since the inner side of the axial guide wheel outside the rotor is an S pole and the outer side is an N pole, the axial guide wheel will rotate under the drive of the external magnetic coupling drive device, thereby driving the entire rotor to rotate. The insertion ends at both ends of the rotor are inserted into the insertion grooves of the two magnet blocks set at the upper and lower openings of the shell. Since the outer side of the insertion end is an N pole and the insertion groove part of the magnet block is also an N pole, the entire rotor will be restricted by the upper and lower magnet blocks, and there will be no direct contact between the two insertion ends and the insertion groove, so that heat will not be generated due to rotational friction to cause the formation of thrombus. In addition, the diameter of channel 1 inside the rotor is the same as the diameter of channel 2 of the magnet block, and the outer diameter of the transmission shaft is also the same as the outer diameter of the magnet block. As a result, when the blood flows out from one end of the housing after being accelerated by the rotor and out from the other end of the housing, the path it passes through is straight and simple, and the blood flow direction will not be disturbed. This simplifies the blood flow path, reduces the change in blood flow direction, further reduces the heat generated, prevents thrombosis, and reduces wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a ventricular assist device for the right heart of a child according to the present invention; Figure 2 A cross-sectional view of a ventricular assist device for the right heart of a child according to the present invention; Figure 3 It is a schematic diagram of the structure of the right ventricular assist device for children at position A, which is enlarged according to the present invention; Figure 4 A cross-sectional view of the internal magnetic pole distribution of a ventricular assist device for the right heart of a child according to the present invention; Figure 5 A schematic diagram of blood flow inside a ventricular assist device for the right heart of a child according to the present invention; Figure 6 This is a schematic diagram of the rotor structure of a ventricular assist device for the right heart of a child according to the present invention.

[0017] In the figure: 1, rotor, 2, magnet stopper, 3, magnet stopper bracket, 4, casing, 5, magnetic shielding ring 1, 6, magnetic shielding ring 2, 7, retaining ring, 8, axial impeller, 9, transmission shaft, 10, axial guide wheel, 11, inner impeller of the shaft, 12, outer casing, 13, inner casing, 14, embedded ring groove, 15, insertion end, 16, insertion groove, 17, channel 1, 18, channel 2. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-6 A ventricular assist device for the right heart of a child comprises a rotor 1 and a shell 4. The shell 4 is a columnar shape with openings at both ends and a hollow interior. A magnet block 2 is arranged at the openings at both ends of the shell 4. A rotor 1 is mounted between the magnet blocks 2. The rotor 1 is suspended between the two magnet blocks 2 by magnetic force. A channel 2 18 is arranged in the middle of the magnet block 2. A channel 1 17 is arranged in the middle of the rotor 1. The diameters of channel 1 17 and channel 2 18 are the same. The diameter of the magnet block 2 is the same as that of the rotor 1. The rotor 1 can rotate under the drive of an external magnetic coupling driving device. The rotor 1 promotes blood flow by rotation. The rotor 1 comprises a transmission shaft 9, an axial impeller 8, an axial guide wheel 10 and other structures. The rotor 1 is driven to rotate by an external magnetic coupling driving device, and the power generated by the rotation of the rotor 1 is converted into kinetic energy of blood flow. The shell 4 provides a protective and supporting frame for the rotor 1, while ensuring that blood can flow smoothly through the device. The openings at both ends of the shell 4 are designed to facilitate the entry and exit of blood, and the internal magnet block 2 is used to position and limit the movement of the rotor 1. The magnet block 2 is located at the openings at both ends of the housing 4, and limits the position of the rotor 1 through magnetic suspension. Due to the fixing method of the magnetic suspension rotor 1, the rotor 1 will not generate friction with the magnet block 2 during rotation, so that no heat will be generated, and blood clots caused by frictional heat will be eliminated. The channel 2 18 set in the middle of the magnet block 2 allows blood to pass through, and at the same time maintains the same diameter as the channel 1 17 in the middle of the rotor 1 and is interconnected. The diameter of the magnet block 2 is the same as that of the rotor 1, so that the path through which blood flows is a straight line, and it will not be blocked by obstacles during the flow process, so as to ensure the smoothness and stability of blood flow, reduce the degree of blood flow disorder, and prevent blood circulation disorders or blood disorder.

[0020] The housing 4 includes an outer shell 12 and an inner shell 13, and the outer shell 12 extends from both ends of the housing 4 to the middle, and an embedded ring groove 14 is formed between the outer shell 12 and the inner shell 13. Since the rotor 1 is installed by magnetic suspension, the magnetic poles between the insertion end 15 and the insertion groove 16 are mutually repelled. However, in the process of driving the rotor 1 to rotate by an external magnetic coupling driving device, the magnetic force generated by the external magnetic coupling driving device can easily affect the magnetic field between the insertion end 15 and the insertion groove 16, thereby causing the instability of the rotor 1. Therefore, a magnetic shielding ring 1 and a magnetic shielding ring 2 are respectively embedded and installed in the embedded ring groove 14, and fixed by a retaining ring 7 to prevent them from loosening or falling off. At this time, the magnetic poles between the insertion ends 15 at both ends of the transmission shaft 9 and the insertion grooves 16 on the magnet stoppers 2 at both ends of the housing 4 are mutually repelled to limit the magnetic field of the rotor 1. Because of the presence of the magnetic shielding ring 1 and the magnetic shielding ring 2, the magnetic field will not be affected by the external magnetic coupling driving device, thereby ensuring the stable rotation of the rotor 1.

[0021] The rotor 1 includes a transmission shaft 9, an axial impeller 8 is arranged on the upper outer part of the transmission shaft 9, an axial guide wheel 10 is arranged on the middle outer part of the transmission shaft 9, the axial guide wheel 10 and a part of the inner shell 13 exposed between the two retaining rings 7 are located at the same height, and both ends of the transmission shaft 9 are respectively provided with insertion ends 15 with an outer diameter smaller than the outer diameter of the transmission shaft 9. A part of the inner shell 13 is exposed between the two retaining rings 7. The functions of the axial impeller 8 and the axial guide wheel 10 are to accelerate the blood flow rate passing therethrough. In order to make the axial guide wheel 10 rotate, the magnetic axial guide wheel 10 is given power through an external magnetic coupling driving device, wherein the axial guide wheel 10 and a part of the inner shell 13 exposed between the two retaining rings 7 are located at the same height, at this time, the outer side of the axial guide wheel 10 is not wrapped by the magnetic shielding ring 1 and the magnetic shielding ring 2, and the external magnetic coupling driving device can directly act on the axial guide wheel 10, so that the axial guide wheel 10 rotates, and further drives the transmission shaft 9 and the axial impeller 8 thereon to rotate. The magnetic setting of the axial guide wheel 10 is that the part of each axial guide wheel 10 close to the transmission shaft 9 is an S pole or an N pole, and the part of each axial guide wheel 10 away from the transmission shaft 9 is an N pole or an S pole, and the setting of the magnetic poles cooperates with the external magnetic coupling drive device. In addition, the magnetic poles of the axial guide wheel 10 are set to be substantially parallel to the length direction of the axial guide wheel 10. Such a setting allows the axial guide wheel 10 to receive the magnetic force with a larger area when it is subjected to the magnetic force of the external magnetic coupling drive device, thereby making it easier to drive the transmission shaft 9 to rotate and making the rotation more stable.

[0022] An inner impeller 11 is arranged on the inner surface of channel 17. Because there are two blood flow paths, one is: entering from channel 2 18 located at the top, flowing through channel 1 17 in the middle of rotor 1, and flowing out from channel 2 18 located at the bottom; the other is: flowing out through the gap between magnet block 2 and transmission shaft 9 and housing 4. The second flow path can accelerate the flow of blood through the rotation of axial impeller 8 and axial guide wheel 10. In the first flow path, there is no acceleration method, so that blood is easily retained inside channel 1 17 and channel 2 18, resulting in inconsistent blood flow rates in the middle and outer parts of the auxiliary device, which easily causes blood flow disorder. Therefore, an inner impeller 11 is also arranged in channel 1 17. When blood flows through channel 1 17 through the first path, due to the rotation of transmission shaft 9, the inner impeller 11 inside is driven to rotate, and the inner impeller 11 accelerates the flow rate of blood flowing through channel 1 17, thereby ensuring the consistency of blood flow rate inside the entire auxiliary device.

[0023] A magnet block bracket 3 is provided on the outside of the magnet block 2, and the magnet block 2 is fixedly connected to the housing 4 through the magnet block bracket 3. An insertion groove 16 is provided at one end of the magnet block 2 located on the inner side of the housing 4, and the inner diameter of the insertion groove 16 is larger than the outer diameter of the insertion end 15. The two insertion ends 15 of the transmission shaft 9 are respectively assembled in the insertion grooves 16 of the two magnet blocks 2. The insertion end 15 and the insertion groove 16 are magnetic and repel each other. The insertion end 15 is located at both ends of the transmission shaft 9, and the outer diameter is smaller than the outer diameter of the transmission shaft 9, so that it is easy to assemble in the insertion groove 16 of the magnet block 2. The insertion groove 16 is located on the inner side of the magnet block 2, and the inner diameter is larger than the outer diameter of the insertion end 15, and is used to accommodate and limit the movement of the insertion end 15. When the insertion ends 15 at both ends of the transmission shaft 9 are inserted into the insertion groove 16 of the magnet retaining ring 7, the magnetic repulsion between the insertion end 15 and the insertion groove 16 realizes the magnetic suspension of the rotor 1. In addition, the rotor 1 will not be worn due to long-term use.

[0024] Working principle: The ventricular assist device for the right heart of the child is implanted in the child's body. After the implantation is completed, the rotor 1 is driven by the magnetic coupling drive device outside the body to rotate. Since the inner side of the axial guide wheel 10 outside the rotor 1 is the S pole and the outer side is the N pole, the axial guide wheel 10 will rotate under the drive of the magnetic coupling drive device outside the body, thereby driving the entire rotor 1 to rotate. The insertion ends 15 at both ends of the rotor 1 are inserted into the insertion grooves 16 of the two magnet blocks 2 set at the upper and lower openings of the shell 4. Since the outer side of the insertion end 15 is the N pole, and the insertion groove 16 part of the magnet block 2 is also the N pole, the entire rotor 1 will be restricted by the upper and lower magnet blocks 2, and there will be no direct contact between the two insertion ends 15 and the insertion groove 16, so that the heat generated by the rotational friction will not cause the formation of thrombus. In addition, the diameter of the channel 1 17 inside the rotor 1 is the same as the diameter of the channel 2 18 of the magnet block 2, and the outer diameter of the transmission shaft 9 is the same as the outer diameter of the magnet block 2. As a result, when the blood flows out from one end of the housing 4 after being accelerated by the rotor 1 and out from the other end of the housing 4, the path it passes through is straight and simple, and the blood flow direction will not be disturbed. This achieves the effect of simplifying the blood flow path, reducing the change of blood flow direction, further reducing the heat generated, preventing thrombosis, and reducing wear.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ventricular assist device for the right heart of a child, characterized in that: The invention comprises a rotor (1) and a shell (4), wherein the shell (4) is in the shape of a column with openings at both ends and a hollow interior, magnet blocks (2) are arranged at the openings at both ends of the shell (4), a rotor (1) is mounted between the magnet blocks (2), the rotor (1) is suspended between the two magnet blocks (2) by magnetic force, a second channel (18) is arranged in the middle of the magnet blocks (2), a first channel (17) is arranged in the middle of the rotor (1), the diameters of the first channel (17) and the second channel (18) are the same, the diameter of the magnet blocks (2) is the same as the diameter of the rotor (1), and the rotor (1) rotates under the drive of an external magnetic coupling drive device.

2. The ventricular assist device for the right heart of a child according to claim 1, characterized in that: The shell (4) comprises an outer shell (12) and an inner shell (13); the outer shell (12) extends from both ends of the shell (4) toward the middle; an embedded annular groove (14) is formed between the outer shell (12) and the inner shell (13).

3. The ventricular assist device for the right heart of a child according to claim 2, characterized in that: A magnetic shielding ring one (5) and a magnetic shielding ring two (6) are respectively embedded and installed in the embedded ring groove (14), and a retaining ring (7) is installed at the opening of the embedded ring groove (14), and the retaining ring (7) is used to fix the magnetic shielding ring one (5) and the magnetic shielding ring two (6).

4. The ventricular assist device for the right heart of a child according to claim 3, characterized in that: A portion of the inner shell (13) is exposed between the two retaining rings (7).

5. The ventricular assist device for the right heart of a child according to claim 1, characterized in that: The rotor (1) comprises a transmission shaft (9), an axial impeller (8) is arranged on the upper outer portion of the transmission shaft (9), an axial guide wheel (10) is arranged on the middle outer portion of the transmission shaft (9), the axial guide wheel (10) and a portion of the inner shell (13) exposed between the two retaining rings (7) are located at the same height, and both ends of the transmission shaft (9) are respectively provided with insertion ends (15) whose outer diameters are smaller than the outer diameter of the transmission shaft (9).

6. The ventricular assist device for the right heart of a child according to claim 1, characterized in that: An inner impeller (11) is arranged on the inner surface of the channel one (17).

7. The ventricular assist device for the right heart of a child according to claim 6, characterized in that: A magnet stopper bracket (3) is provided on the outer side of the magnet stopper (2), and the magnet stopper (2) is fixedly connected to the housing (4) via the magnet stopper bracket (3).

8. The ventricular assist device for the right heart of a child according to claim 5, characterized in that: An insertion groove (16) is provided at one end of the magnet stopper (2) located inside the housing (4); the inner diameter of the insertion groove (16) is greater than the outer diameter of the insertion end (15); and the two insertion ends (15) of the transmission shaft (9) are respectively assembled in the insertion grooves (16) of the two magnet stoppers (2).

9. The ventricular assist device for the right heart of a child according to claim 5, characterized in that: The insertion end (15) and the insertion slot (16) are magnetic and repel each other.

10. The ventricular assist device for the right heart of a child according to claim 5, characterized in that: The axial guide wheel (10) is magnetic, and a portion of each axial guide wheel (10) close to the transmission shaft (9) is an S (N) pole, and a portion of each axial guide wheel (10) far from the transmission shaft (9) is an N (S) pole.

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