CN114306923A - Shaftless magnetic suspension ventricle auxiliary device - Google Patents

Abstract

The invention discloses a shaftless magnetic suspension ventricle auxiliary device which comprises an annular stator casing, wherein the upper port and the lower port of the stator casing are connected with pipelines; the inner side of the stator casing is provided with an inner mounting groove, the outer side of the stator casing is provided with an outer mounting groove, the inner mounting groove and the outer mounting groove correspond in position, and a mounting hole is formed between the inner mounting groove and the outer mounting groove; an annular rotor permanent magnet is arranged in the inner mounting groove, a rotor iron core ring is arranged on the inner ring of the rotor permanent magnet, and a plurality of blades are arranged on the inner side of the rotor iron core ring; an annular mounting piece is mounted in the outer mounting groove, a silicon steel sheet is arranged on the inner side of the mounting piece and located in the mounting hole, and two groups of winding coils are arranged on the silicon steel sheet; the invention avoids the flow field dead zone of the mechanical bearing, has no heating and mechanical abrasion, and reduces the risks of equipment thrombosis, hemolysis and mechanical failure to the minimum.

Description

Shaftless Magnetic Levitation Ventricular Assist Device

technical field

The invention relates to a shaftless magnetic levitation ventricular auxiliary device, which is used to replace the auxiliary circulation device for ventricular work.

Background technique

Ventricular assist device is a cardiac mechanical assist device that provides support for circulation when the cardiac function cannot meet the needs of system perfusion. The main component of a ventricular assist device is a mechanical pump, which can replace the pumping function of the heart and restore function to the failing heart. At present, the types of ventricular assist devices mainly include pulsatile diaphragm pumps, mechanical or magnetic bearing centrifugal pumps, and mechanical bearing axial flow pumps. Among them, the axial flow pump (such as Heartmate 2) is currently the most implanted ventricular assist device. Its structure includes: 1. A stator with coil windings, which can release a periodically rotating magnetic field; 2. A rotor with permanent magnets, The rotor surface is inlaid with blades similar to Archimedes' helix, and the blades are perpendicular to the rotor surface. When the rotor rotates, it can drive the blood to flow toward the long axis of the pump; 3. Ruby bearing, as the mechanical support for rotor rotation. During the use of traditional mechanical bearing axial flow ventricular assist devices, the main problems that limit the safety of the device are the embolism of the patient's vital organs and mechanical failure caused by thrombosis at the bearing. The improvement point of axial flow ventricular assist device has been to optimize the flow field by improving the blade shape design, or change the bearing material to increase blood compatibility, but it cannot solve the fundamental problem.

Magnetic levitation centrifugal pump is currently the best ventricular assist method for blood compatibility. The pump inlet and rotor plane are perpendicular, the pump outlet and the rotor plane are on the same horizontal plane, the inlet and outlet are perpendicular to each other in space, and the blades are generally inlaid on the rotor plane. , the blood flow direction is changed by 90° after entering the pump cavity, and then pumped out through the outlet. Therefore, there is a lot of backflow in the pump. After the blood components enter the pump cavity, they are repeatedly acted by the shear force of the blades. Studies have shown that the coagulation components in the blood will be damaged by repeated shear force, which may lead to complications such as the exit of the digestive tract in the long run. disease. In addition, the shape of the rotor is a flat cylinder, only the circular upper surface is inlaid with the impeller, and the other surfaces are smooth planes. There is a risk of forming a dead zone without flow between the rotor and the pump casing, and once there is a dead zone, there is a risk of thrombosis.

For example, the ventricular assist pump without a hub and using a two-stage front and rear guide vane structure disclosed in the patent document with the authorization announcement number CN210904322U can reduce the flow dead zone around the guide vane by improving the guide vane, thereby reducing the probability of surrounding thrombosis and reducing wear and tear , but the bearing still exists can not fundamentally prevent the formation of thrombosis.

For example, the left ventricular auxiliary pump disclosed in the patent document with publication number CN107281567A, the auxiliary pump also adopts the design of mechanical bearing, and the plate is embedded on the central shaft of the rotor, but it still cannot completely avoid the dead zone at the bearing, and there is a large thrombus. create risk.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a shaftless magnetic levitation ventricular auxiliary device, which avoids the dead zone of the flow field of conventional mechanical bearings and magnetic levitation centrifugal pumps.

In order to solve the above technical problems, the shaftless magnetic levitation ventricular auxiliary device of the present invention includes an annular stator casing, and the upper port and the lower port of the stator casing are connected with pipelines, such as artificial blood vessels. The inner side of the stator casing is provided with an inner installation groove, the outer side of the stator casing is provided with an outer installation groove, the positions of the inner installation groove and the outer installation groove correspond to each other, and there are installation holes between the inner installation groove and the outer installation groove; An annular rotor permanent magnet is installed in the inner installation groove, a rotor iron core ring is installed on the inner ring of the rotor permanent magnet, and a number of blades are installed on the inner side of the rotor iron core ring; an annular installation part is installed in the outer installation groove A silicon steel sheet is arranged on the inner side of the mounting piece, the silicon steel sheet is located in the mounting hole, and two sets of winding coils are arranged on the silicon steel sheet.

The shaftless magnetic suspension ventricular auxiliary device of the present invention is composed of a magnetic suspension shaftless pump and an artificial blood vessel. The artificial blood vessel is connected with the shaftless pump in advance. When in use, the artificial blood vessel can be connected to the aorta from the apex of the heart or directly replace a section of the ascending aorta. The silicon steel sheet of the stator is wound with two sets of windings that are individually controlled. One set controls the suspension of the rotor, and the other set controls the rotation of the rotor. The two sets of windings can be decoupled by the suspension force to achieve mutual non-interference and work together.

The inner installation groove is arc-shaped, and the rotor permanent magnet outer ring is arc-shaped corresponding to the inner installation groove. Further, the inner side of the stator casing is provided with an upper arc-shaped boss and a lower arc-shaped boss, the upper arc-shaped boss is located on the upper edge of the inner installation groove, and the lower arc-shaped boss is located under the inner installation groove. On the edge, the upper arc-shaped boss surface, the inner mounting groove surface, and the lower arc-shaped boss surface form a continuous curved surface.

Preferably, the outer surface of the stator casing is arc-shaped.

Specifically, the number of the mounting holes is six. The stator casing is hollow.

The rotor of the present invention is composed of a rotor permanent magnet, a rotor iron core ring and an integrated blade, and the blade is embedded in the inner side of the rotor iron core ring. The blood is mainly driven through the cavity inside the rotor iron core ring. Due to the pressure difference between the rotor iron core ring and the bearing gap, a part of the blood can quickly pass through the gap between the stator and rotor, forming a flow channel that continuously scours the bearing gap, preventing red blood cells and coagulation. Components are deposited in bearing clearances. In addition, because the bearing clearance is extremely small and the flow rate is fast, there is no backflow, the entire flow field is very smooth, and the blood contact time inside the stator casing is very short, that is, there is no dead zone and no backflow. The application of magnetic levitation technology avoids the dead zone of the flow field of the mechanical bearing, there is no heat generation, no mechanical wear, and the risk of equipment thrombosis, hemolysis, and mechanical failure is minimized. The blade, rotor and blood flow channel are integrated into the design, there is no "shaft" in the whole pump, the structure is simple, the contact time between the blood and the blade is extremely short, and the risk of blood damage is reduced, and the rotor and stator casings are designed as The streamlined surface also avoids dead zones in the pump.

Description of drawings

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Figure 1 is an external view of the present invention.

Figure 2 is an exploded view of the present invention.

Figure 3 is a schematic diagram of the stator casing and its interior.

Figure 4 is a schematic diagram of the stator casing.

FIG. 5 is a schematic diagram of a rotor permanent magnet.

FIG. 6 is a schematic diagram of the rotor core ring.

FIG. 7 is a schematic diagram of the annular mount and the silicon steel sheet.

Figure 8 is a schematic diagram of the connection of the artificial blood vessel from the apex of the heart to the aorta.

Fig. 9 is a schematic diagram of replacing a section of ascending aorta with artificial blood vessel.

Detailed ways

As shown in Figures 1 and 2, the shaftless magnetic levitation ventricular auxiliary device includes an annular stator casing 1, the stator casing 1 is hollow, the outer surface of the stator casing 1 is arc-shaped, and the upper and lower ports of the stator casing 1 are An artificial blood vessel 2 is connected. The artificial blood vessel 2 is pre-connected to the shaftless pump (ie, the stator casing 1). When in use, the artificial blood vessel 2 can be connected from the apex to the aorta (as shown in Figure 8) or directly replace a section of the ascending aorta (as shown in Figure 9 ). shown).

As shown in FIGS. 2 , 3 and 4 , the inner side of the stator casing 1 has an inner installation slot 9 , the inner installation slot 9 is arc-shaped, and an annular rotor permanent magnet 5 (eg, an arc) is installed in the inner installation slot 9 5 ), the outer ring of the rotor permanent magnet 5 is arc-shaped corresponding to the inner installation groove 9 . A rotor iron core ring 6 (as shown in FIG. 6 ) is installed on the inner ring of the rotor permanent magnet 5 , and a plurality of blades 7 are installed on the inner side of the rotor iron core ring 6 . In order to avoid the dead zone in the pump, the inner side of the stator casing 1 is provided with an upper arc-shaped boss 12 and a lower arc-shaped boss 13. The upper arc-shaped boss 12 is located on the upper edge of the inner installation slot 9, and the lower arc-shaped boss The boss 13 is located on the lower edge of the inner mounting groove 9. The surface of the upper arc-shaped boss 12, the groove surface of the inner mounting groove 9, and the surface of the lower arc-shaped boss 13 form a continuous curved surface, that is, a streamlined surface.

As shown in FIG. 4 , the outer side of the stator casing 1 is provided with an outer mounting groove 10 , and an annular mounting member 3 is installed in the outer mounting groove 10 . As shown in FIG. 7 , six groups of silicon steel are provided on the inner side of the mounting member 3 Sheet 4, two sets of winding coils 8 are arranged on the silicon steel sheet 4. The inner installation slot 9 and the outer installation slot 10 correspond in position, and there are installation holes 11 between the inner installation slot 9 and the outer installation slot 10 . Two sets of individually controlled windings are wound around the silicon steel sheet 4 of the stator. One set controls the suspension of the rotor (ie, the rotor permanent magnet 5, the rotor core ring 6 and the blades 7), the other set controls the rotation of the rotor, and the two sets of windings pass through the rotor. Suspension force decoupling can achieve mutual non-interference and work together. Winding energization control belongs to the prior art and will not be repeated in the present invention.

The blood is mainly driven through the cavity inside the rotor core ring 6 , and a small part of the blood flows through the gap between the stator and the rotor. The application of magnetic levitation technology avoids the dead zone of the flow field of the mechanical bearing, there is no heat generation, no mechanical wear, and the risk of equipment thrombosis, hemolysis, and mechanical failure is minimized.

The above embodiments do not limit the present invention in any way, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (6)

1. The shaftless magnetic levitation ventricular auxiliary device is characterized in that it comprises an annular stator casing, and the upper port and the lower port of the stator casing are connected with pipelines; The outer side of the shell is provided with an outer installation groove, the positions of the inner installation groove and the outer installation groove are corresponding, and there are installation holes between the inner installation groove and the outer installation groove; the inner installation groove is installed with a ring-shaped rotor permanent magnet, and the A rotor iron core ring is installed on the inner ring of the permanent magnet of the rotor, and a plurality of blades are installed on the inner side of the rotor iron core ring; an annular installation part is installed in the outer installation groove, and a silicon steel sheet is arranged on the inner side of the installation part, and the silicon steel sheet Located in the installation hole, two sets of winding coils are arranged on the silicon steel sheet. 2 . The shaftless magnetic levitation ventricular auxiliary device according to claim 1 , wherein the inner installation groove is arc-shaped, and the rotor permanent magnet outer ring is arc-shaped corresponding to the inner installation groove. 3 . 3 . The shaftless magnetic levitation ventricular auxiliary device according to claim 2 , wherein an upper arc-shaped boss and a lower arc-shaped boss are arranged on the inner side of the stator casing, and the upper arc-shaped boss is installed in the inner side. 4 . On the upper edge of the groove, the lower arc-shaped boss is located on the lower edge of the inner installation groove, and the upper arc-shaped boss surface, the inner installation groove groove surface, and the lower arc-shaped boss surface form a continuous curved surface. 4 . The shaftless magnetic levitation ventricular assist device according to claim 1 , wherein the outer surface of the stator casing is arc-shaped. 5 . 5 . The shaftless magnetic levitation ventricular assist device according to claim 1 , wherein the number of the mounting holes is six. 6 . 6 . The shaftless magnetic levitation ventricular assist device according to claim 1 , wherein the stator casing is hollow. 7 .

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