A pediatric ventricular assist device

Abstract

The utility model belongs to the field of medical apparatus and instruments, especially a kind of children ventricle auxiliary device, including outer tube, inner tube is equipped in outer tube, inner tube and outer tube coaxial alignment, two first fixed magnets of fixed connection are equipped between inner tube and outer tube, two first fixed magnets are equipped with coil fixedly connected with inner tube between, coil and first fixed magnet mutually close, inner tube inboard fixedly connected with two second fixed magnets, two second fixed magnets are equipped with the suspension module suspended in inner tube between, to carry out axial magnetization and radiation magnetization to suspension module by first fixed magnet and second fixed magnet, realize the magnetic suspension of impeller in axial and radial, cooperate coil energization and drive suspension module rotation, carry out the pumping of blood, and except impeller, there is no support shielding flow channel in inner tube, and flow field flows well, reduce blood impact and reflux, reduce the risk of hemolysis, the mode of suspension avoids continuous friction, avoids the risk of thrombosis generation.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically a ventricular assist device for children. Background Technology

[0002] As a crucial treatment device for children with severe heart failure, ventricular assist devices (VADs) for children face stringent requirements regarding safety, portability, and biocompatibility. Traditional VADs for children often employ a shaft-driven structure with a large air gap between the coil and magnet. This results in low coil efficiency, significant heat generation, and high overall power consumption, which in turn shortens battery life and restricts the child's freedom of movement. Furthermore, the shaft and support structure can easily obstruct the flow path, causing turbulent flow, blood shock, and backflow, significantly increasing the risk of hemolysis. Additionally, the mechanical contact points are prone to thrombosis, posing a serious threat to the child's life.

[0003] While existing ventricular assist devices for children have made improvements in reducing mechanical friction, they still suffer from insufficient air gap optimization, making them difficult to adapt to the unique physiological structure and clinical treatment needs of children. Therefore, developing a ventricular assist device for children that combines high efficiency, energy saving, safety, reliability, and excellent biocompatibility has become an urgent need in the field of medical devices. Utility Model Content

[0004] The purpose of this invention is to provide a ventricular assist device for children to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pediatric ventricular assist device, comprising an outer cylinder and an inner cylinder inside the outer cylinder, the inner cylinder and the outer cylinder being coaxially aligned, two first fixed magnets fixedly connected front and rear to the inner cylinder, a coil fixedly connected to the inner cylinder between the two first fixed magnets, the coil being in close contact with the first fixed magnets, two second fixed magnets fixedly connected front and rear to the inner side of the inner cylinder, a suspension module suspended within the inner cylinder between the two second fixed magnets, thereby achieving axial and radial magnetic levitation of the impeller by axial and radial magnetization of the suspension module through the first fixed magnets and the second fixed magnets. When the coil is energized, it drives the suspension module to rotate, pumping blood. Furthermore, except for the impeller, there are no supporting obstructions to the flow channel within the inner cylinder, resulting in good flow field, reducing blood impact and backflow, lowering the risk of hemolysis, and the suspension method avoids continuous friction, thus avoiding the risk of thrombosis.

[0006] Preferably, the levitation module includes an annular frame located inside the inner cylinder, an annular magnet fixedly connected inside the annular frame, a connecting frame fixedly connected to the rear end face of the annular frame, a first rotating magnet fixedly connected to both the rear end face of the connecting frame and the front end face of the annular frame, a magnetic shielding ring fixedly connected to the first rotating magnet, a second rotating magnet fixedly connected to the magnetic shielding ring, and an impeller rotatably connected inside the annular frame. This allows the first fixed magnet to radiate magnetize the first rotating magnet, and the second fixed magnet to axially magnetize the second rotating magnet, thus magnetically levitizing the entire levitation module. This avoids continuous friction and the risk of thrombosis. Furthermore, when the coil is energized, it generates an alternating magnetic field that drives the impeller to rotate, thereby pumping blood. Preferably, the magnetic shielding ring isolates the second rotating magnet and the first rotating magnet, thereby constraining the magnetic field, ensuring safety, and stabilizing the levitation. Preferably, a mounting bracket is fixedly connected to the outer side of the inner cylinder, and the coil and the first fixed magnet are fixedly mounted by the mounting bracket; Preferably, an annular silicon steel sheet is fixedly connected between the coil and the outer cylinder, and the annular silicon steel sheet plays the role of enhancing the magnetic field and optimizing the magnetic circuit.

[0007] Preferably, an outer cylinder rear cover and an outer cylinder front cover are fixedly connected between the outer cylinder and the inner cylinder, and the gap between the outer cylinder and the inner cylinder is sealed by the outer cylinder rear cover and the outer cylinder front cover; Preferably, the outer cylinder is provided with the cable port, through which the coil is wired and energized.

[0008] Compared with the prior art, the beneficial effects of this utility model are: This invention utilizes a suspension module, a coil, and a first fixed magnet. The first fixed magnet and an annular silicon steel sheet axially and radially magnetize the suspension module, achieving magnetic levitation of the impeller in both the axial and radial directions. The magnet is closely attached to the coil, reducing the air gap, effectively improving coil efficiency, reducing coil heating, lowering overall power consumption, and increasing battery life. The inner cylinder, except for the impeller, has no supporting obstructions to the flow channel, resulting in good flow field, reducing blood impact and backflow, lowering the risk of hemolysis, and the suspension method avoids continuous friction, thus preventing the risk of thrombosis. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 A schematic diagram of the AA cross-section; Figure 4for Figure 3 A magnified view of a portion of the image; Figure 5 for Figure 3 A magnified view of a portion of the image; Figure 6 This is a three-dimensional cross-sectional schematic diagram of the outer cylinder of this utility model; Figure 7 This is a three-dimensional cross-sectional view of the inner cylinder of this utility model; Figure 8 This is a three-dimensional schematic diagram of the impeller of this utility model; Figure 9 This is a three-dimensional schematic diagram of the forces acting on each magnet of this utility model.

[0010] In the diagram: 100, outer cylinder; 101, cable port; 102, outer cylinder rear cover; 103, inner cylinder; 104, outer cylinder front cover; 105, first fixed magnet; 106, annular silicon steel sheet; 107, coil; 108, second fixed magnet; 109, second rotating magnet; 110, first rotating magnet; 111, connecting frame; 112, mounting frame; 113, impeller; 114, annular frame; 115, annular magnet; 116, magnetic shielding ring; 117, suspension module. Detailed Implementation

[0011] To facilitate a better understanding of this utility model, the following examples are provided in conjunction with the accompanying drawings. These examples fall within the protection scope of this utility model, but do not limit the protection scope of this utility model.

[0012] Example 1: Please see Figure 1-7 This utility model provides a technical solution: a pediatric ventricular assist device, including an outer cylinder 100, an inner cylinder 103 inside the outer cylinder 100, the inner cylinder 103 and the outer cylinder 100 being coaxially aligned, two first fixed magnets 105 fixedly connected between the inner cylinder 103 and the outer cylinder 100, a coil 107 fixedly connected to the inner cylinder 103 between the two first fixed magnets 105, the coil 107 being tightly attached to the first fixed magnets 105, and two second fixed magnets 108 fixedly connected to the inner side of the inner cylinder 103. A suspension module 117 is provided between the fixed magnets 108 and suspended within the inner cylinder 103. The first fixed magnet 105 and the second fixed magnet 108 magnetize the suspension module 117 axially and radially, thereby achieving magnetic levitation of the impeller in the axial and radial directions. When the coil 107 is energized, it drives the suspension module 117 to rotate, thereby pumping blood. In addition, there are no supporting obstructions to the flow channel inside the inner cylinder 103 except for the impeller 113, resulting in good flow field, reducing blood impact and backflow, and lowering the risk of hemolysis. The suspension method avoids continuous friction and avoids the risk of thrombosis.

[0013] The levitation module 117 includes an annular frame 114 located inside the inner cylinder 103. An annular magnet 115 is fixedly connected inside the annular frame 114. A connecting frame 111 is fixedly connected to the rear end face of the annular frame 114. A first rotating magnet 110 is fixedly connected to both the rear end face of the connecting frame 111 and the front end face of the annular frame 114. A magnetic shielding ring 116 is fixedly connected to the first rotating magnet 110. A second rotating magnet 109 is fixedly connected to the magnetic shielding ring 116. An impeller 113 is rotatably connected inside the annular frame 114. Thus, the first fixed magnet 105 radiates and magnetizes the first rotating magnet 110, and the second fixed magnet 108 axially magnetizes the second rotating magnet 109, thereby magnetically levitizing the entire levitation module 117, avoiding continuous friction and the risk of thrombosis. When the coil 107 is energized, it generates an alternating magnetic field to drive the impeller 113 to rotate, thus pumping blood. The magnetic shielding ring 116 isolates the second rotating magnet 109 and the first rotating magnet 110, thereby constraining the magnetic field, protecting safety, and stabilizing levitation. The inner cylinder 103 is fixedly connected to the outer side of the mounting bracket 112, and the coil 107 and the first fixed magnet 105 are fixedly mounted by the mounting bracket 112. An annular silicon steel sheet 106 is fixedly connected between the coil 107 and the outer cylinder 100. The annular silicon steel sheet 106 enhances the magnetic field and optimizes the magnetic circuit.

[0014] An outer cylinder rear cover 102 and an outer cylinder front cover 104 are fixedly connected between the outer cylinder 100 and the inner cylinder 103, and the gap between the outer cylinder 100 and the inner cylinder 103 is sealed by the outer cylinder rear cover 102 and the outer cylinder front cover 104. The outer cylinder 100 is provided with the cable port 101, through which the coil 107 is connected and energized.

[0015] Working principle: In use, the device is implanted into the child's body via a minimally invasive procedure, with its inner cylinder 103 connected at both ends to the ventricle and aorta (or corresponding blood vessels), respectively. An external portable battery cable passes through the cable port 101 to power the coil. Initially, the first fixed magnet 105 radiates magnetization onto the first rotating magnet 110, and the second fixed magnet 108 axially magnetizes the second rotating magnet 109, keeping the levitation module 117 in a magnetically levitated state. Upon startup, the coil 107 is energized to generate an alternating magnetic field, and the impeller's magnetic levitation rotation generates negative pressure, drawing blood from the ventricle into the flow channel. The thrust of the rotating impeller then pressurizes the blood and delivers it to the entire circulatory system. The entire process requires no mechanical contact, relying on magnetic levitation drive and optimized flow channel design to efficiently deliver blood while reducing the risk of thrombosis and hemolysis. Furthermore, the low-power design extends battery life and is suitable for children's active needs.

[0016] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pediatric ventricular assist device, comprising an outer cylinder (100), characterized in that: The outer cylinder (100) is provided with an inner cylinder (103). The inner cylinder (103) and the outer cylinder (100) are coaxially aligned. Two first fixed magnets (105) are fixedly connected between the inner cylinder (103) and the outer cylinder (100). A coil (107) is fixedly connected to the inner cylinder (103) between the two first fixed magnets (105). The coil (107) is in close contact with the first fixed magnets (105). Two second fixed magnets (108) are fixedly connected to the inner side of the inner cylinder (103). A suspension module (117) is suspended in the inner cylinder (103) between the two second fixed magnets (108). An impeller (113) is provided in the (117).

2. The ventricular assist device for children according to claim 1, characterized in that: The suspension module (117) includes an annular frame (114) located inside the inner cylinder (103). An annular magnet (115) is fixedly connected inside the annular frame (114). A connecting frame (111) is fixedly connected to the rear end face of the annular frame (114). A first rotating magnet (110) is fixedly connected to both the rear end face of the connecting frame (111) and the front end face of the annular frame (114). A magnetic shielding ring (116) is fixedly connected to the first rotating magnet (110). A second rotating magnet (109) is fixedly connected to the magnetic shielding ring (116). The annular frame (114) is rotatably connected to the impeller (113).

3. A pediatric ventricular assist device according to claim 2, characterized in that: The magnetic shielding ring (116) isolates the second rotating magnet (109) and the first rotating magnet (110).

4. A pediatric ventricular assist device according to claim 1, characterized in that: The inner cylinder (103) is fixedly connected to the outer side of the mounting bracket (112), and the coil (107) and the first fixed magnet (105) are fixedly mounted by the mounting bracket (112).

5. A pediatric ventricular assist device according to claim 1, characterized in that: An annular silicon steel sheet (106) is fixedly connected between the coil (107) and the outer cylinder (100).

6. A pediatric ventricular assist device according to claim 1, characterized in that: The outer cylinder (100) and the inner cylinder (103) are fixedly connected by an outer cylinder rear cover (102) and an outer cylinder front cover (104).

7. A pediatric ventricular assist device according to claim 1, characterized in that: The outer cylinder (100) is provided with the cable port (101).

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