CN201308666Y - Artificial heart auxiliary device of conical rotor driven by external field - Google Patents

Abstract

The utility model belongs to the technical field of biomedical engineering, and relates to a blood pump auxiliary device, in particular to an artificial heart auxiliary device which uses an external magnetic field to drive a magnetic bearing to support an implantable conical spiral impeller rotor. In the variable magnetic field, the device includes a small end housing (1) connected to the blood vessel, a large end housing (4), an intermediate housing (3), and the large end and the small end of the intermediate housing (3) are connected with the small end housing (1) respectively. It is sealed and connected with the big end shell (4), and the small end guide wheel (2) and the big end guide wheel (6) with impellers on the outer surface are respectively fixedly installed in the small end shell (1) and the big end shell (4). The impeller rotor (5) is arranged in the space formed by the middle casing (3), the small end guide wheel (2) and the big end guide wheel (6), and the shaft (11) is arranged in the impeller rotor (5). A permanent magnet magnetic strip (12) is fixedly installed between the impeller rotor (5) and the shaft (11), and there is a gap between the impeller rotor (5) and the small end guide wheel (2) and the large end guide wheel (6). It effectively solves a series of technical problems that are difficult to overcome with traditional artificial assistance, such as seal infection caused by wires passing through the skin and biocompatibility.

Description

External field driven conical rotor artificial heart assist device

technical field

The utility model belongs to the technical field of biomedical engineering and relates to a blood pump auxiliary device, in particular to an artificial heart auxiliary device which adopts an external magnetic field to drive a magnetic bearing to support an implantable conical spiral impeller rotor.

Background technique

The heart is the power source of human blood circulation. Cardiovascular disease has become the leading cause of human death today. Although heart transplantation is the most effective means of treating critically ill patients with heart disease, many patients die each year while waiting for heart transplantation because the number of recipients is far greater than that of donors. In order to solve this problem, artificial heart assist devices have been proposed. The existing artificial heart assist devices at home and abroad are mainly axial-flow blood pumps, and most axial-flow blood pumps provide energy through power and control wires that pass through the skin. Due to sealing reasons, it is easy to cause receptor infection and Biocompatibility and other issues; at the same time, the rotor of the blood pump is supported by mechanical bearings, and the long-term operation of the blood pump can easily lead to bearing wear and heating; the design of the rotor and flow channel of the blood pump does not conform to the physiological flow of blood, causing hemolysis and thrombus, etc. A series of puzzles.

Contents of the invention

In order to overcome the shortcomings of traditional artificial heart assisting devices, the utility model provides an external field driven conical rotor artificial heart assisting device. The device has a compact structure, integrates drive and control, and effectively solves the seal infection caused by the wire passing through the skin. As well as biocompatibility and other technical problems that are difficult to overcome with traditional artificial aids.

The purpose of this utility model is achieved through the following technical solutions: an external field-driven conical rotor artificial heart assisting device, the device is placed in an alternating magnetic field, the device includes a small-end shell and a large-end shell connected to blood vessels, The middle shell, the big end and the small end of the middle shell are respectively sealed and connected with the small end shell and the big end shell, and the small end guide wheel and the big end guide wheel with impellers on the outer surface are respectively fixedly installed in the small end shell and the big end shell, The impeller rotor is arranged in the space formed by the middle shell, the small-end guide wheel and the large-end guide wheel, and a shaft is arranged in the impeller rotor, and a permanent magnet magnetic strip is fixedly installed between the impeller rotor and the shaft, and the impeller rotor There is a gap between the small end guide wheel and the big end guide wheel.

As an improvement of the utility model, the small-end guide wheel and the large-end guide wheel are respectively provided with two-stage stepped circular grooves, and axial permanent magnetic bearings for axial magnetization are fixedly installed in the two-stage stepped circular grooves. ring and radially magnetized radial permanent magnetic bearing outer ring, the polarities of the axial permanent magnetic bearing rings located at the small end guide wheel and the large end guide wheel are opposite; shaft handles are arranged at both ends of the shaft, and the shaft handle The inner ring of the radial permanent magnetic bearing that is radially magnetized is fixedly installed on the top, the inner ring of the radial permanent magnetic bearing is located in the outer ring of the radial permanent magnetic bearing, and the polarity of the outer ring of the radial permanent magnetic bearing is opposite, so There is a gap between the radial permanent magnetic bearing inner ring, the axial permanent magnetic bearing ring and the radial permanent magnetic bearing outer ring.

As an improvement of the utility model, the permanent magnetic strips are composed of four 1/4 cylindrical permanent magnetic strips, and are radially magnetized, and the directions of N and S poles of two adjacent magnetic poles are opposite.

As a preferred mode of the present invention, the alternating magnetic field is composed of several even-numbered coils arranged outside the body and uniformly distributed in the radial direction, and the coils are respectively connected to the terminals of the frequency converter.

Adopting this scheme, the utility model realizes the conical spiral impeller rotor blood pump installed in the body driven by the external magnetic field generated by the external coil controlled by the frequency converter, avoiding a series of sealing infection and biocompatibility caused by the wire passing through the skin Traditional blood pumps are difficult to overcome. At the same time, the special conical helical impeller rotor in this device can completely realize magnetic levitation in the axial and radial directions under the action of permanent magnetic bearings, which reduces the friction, wear, and heat caused by mechanical bearings. The resulting hemolysis and thrombus can maintain normal human blood circulation for a long time. By adopting a frequency converter to control coil energization, adjusting the current size to generate an alternating magnetic field to drive the permanent magnetic strip in the blood pump rotor installed in the body without contact, the device can be conveniently implanted in the body without the need for wires to pass through Skin, effectively avoiding infection and biocompatibility problems caused by sealing; high-energy permanent magnetic bearings completely suspend the blood pump rotor radially and axially, avoiding hemolysis and thrombus caused by friction, wear and heat caused by mechanical bearings and other complications, the special conical spiral impeller design enables the rotor to cut red blood cells as little as possible during rotation, reducing the damage to the formed components of blood; the structure is simple, and the drive and control are integrated.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Fig. 1 is a schematic cross-sectional structure diagram of a conical rotor artificial heart assist device driven by an external field;

Fig. 2 is an axial side view of the artificial heart assist device driven by the conical rotor in the external field;

Fig. 3 is the front view of big end guide wheel;

Fig. 4 is the left view of big end guide wheel;

Fig. 5 is the schematic diagram of the installation relationship between the permanent magnetic strip and the shaft;

Fig. 6 is an outline view of the impeller rotor.

Detailed ways

The extracorporeal field-driven conical rotor artificial heart assisting device provided by the utility model includes a small-end housing 1, an intermediate housing 3, a large-end housing 4, a small-end guide wheel 2, a large-end guide wheel 6, an impeller rotor 5, and a permanent magnetic strip 12. The axial permanent magnetic bearing ring 7, the radial permanent magnetic bearing inner ring 8, the radial permanent magnetic bearing outer ring 9 and the shaft 11 are composed, as shown in Fig. 1 . The device is placed in an alternating magnetic field, the big-end housing 4, the small-end housing 1 and the middle housing 3 are connected by fine threads, and three spiral blades are uniformly distributed on the impeller rotor 5, and the outer edge thereof gradually increases, as shown in the figure 6. The large end guide wheel 6 and the small end guide wheel 2 are provided with guide wheel blades, as shown in FIG. 3 , and are respectively fixed in the large end shell 4 and the small end shell 1 by the guide wheel blades. There is a small radial gap between the impeller rotor 5 and the middle casing 3, and there is a small axial gap between the large end guide wheel 6 and the small end guide wheel 2. Shaft 11 is arranged in impeller rotor 5, and permanent magnet magnetic strip 12 is fixedly installed between impeller rotor 5 and shaft 11, like this, through the effect of the magnetic torque that permanent magnet magnetic strip 12 receives in the alternating magnetic field, will make the The impeller rotor 5 rotates in the device of the present invention, so that the blood can flow from the small end housing 1 to the large end housing 4 .

The large end guide wheel 6, the small end guide wheel 2, the large end shell 4, the small end shell 1, the middle shell 3 and the rotor 5 adopted in the utility model are light in weight, non-magnetic and have good biocompatibility Made of titanium alloy material, the permanent magnetic strip 12 is composed of four radially magnetized 1/4 cylindrical magnetic strips. The inner surface of the permanent magnetic strip 12 cooperates with the shaft 11, and each adjacent two magnetic strips The directions of the N and S poles are opposite, and the outer surface of the permanent magnet magnetic strip 12 and the inner hole of the impeller rotor 5 have an interference fit, as shown in FIG. 5 .

Two-level grooves are respectively set in the large-end guide wheel 6 and the small-end guide wheel 2, as shown in Figure 1 and Figure 4, the outer ring 9 of the radial permanent magnetic bearing is installed in the groove by means of interference fit . Shaft handles are arranged at both ends of the shaft 11, and the radial permanent magnetic bearing inner ring 8 is also installed on the shaft handles by way of interference fit. The inner ring 8 of the radial permanent magnetic bearing and the outer ring 9 of the radial permanent magnetic bearing are radially excited respectively, the polarities of the two are opposite and there is a small gap between them. The impeller rotor 5 can realize radial levitation through the radial permanent magnetic bearing inner ring 8 and the radial permanent magnetic bearing outer ring 9 installed on the shaft 11 .

Axial permanent magnetic bearing rings 7 are respectively installed in the grooves of the large-end guide wheel 6 and the small-end guide wheel 2, and are also installed along the axial direction of the shaft 11 by way of interference fit. The magnetic bearing ring 7 is axially excited and of opposite polarity. Here, the radial permanent magnetic bearing inner ring 8 is also axially excited, and the polarity of the radial permanent magnetic bearing inner ring 8 is opposite to that of the axial permanent magnetic bearing ring 7 so that the impeller rotor 5 passes through the radial permanent magnetic bearing ring 7 installed on the shaft 11. The magnetic bearing inner ring 8 and the axial permanent magnetic bearing ring 7 realize axial suspension.

Like this, impeller rotor 5 just can be under the joint action of radial permanent magnetic bearing inner ring 8 and axial permanent magnetic bearing ring 7, radial permanent magnetic bearing outer ring 9, realizes impeller rotor 5 in small end guide wheel 2, large Axial and radial suspension between the end guide wheel 6 and the middle housing 3 .

The utility model adopts the impeller rotor 5 of conical spiral shape, and its outer edge gradually increases, so the fluid linear velocity driven by the impeller of the impeller rotor 5 changes slowly and evenly, so the shear force caused is small; The destruction of red blood cells can significantly reduce hemolysis and thrombosis.

The alternating magnetic field used in the utility model is generated by a number of even-numbered coils 10 that are arranged outside the body and are evenly distributed in the radial direction. The coils are respectively connected to the terminals of the frequency converter 13. In this embodiment, 6 coils are used, as shown in the figure 2 shown. Utilizing the basic principle of permanent magnet synchronous motor, six coils 10 are evenly distributed radially at a certain distance around the device, and the six coils 10 are respectively connected to the frequency converter 13, and the alternating conduction of the coils 10 is controlled by the frequency converter 13, and an alternating current is generated. changing magnetic field. The alternating magnetic field generated outside the body is coupled with the magnetic field generated by the permanent magnetic strip 12 installed in the impeller rotor 5 inside the body, and the resulting driving torque can realize the high-speed rotation of the impeller rotor 5 inside the body, thereby driving the flow of blood flow.

When in use, after adjusting the proper current and voltage of the frequency converter 13, the coil 10 is energized to generate an alternating magnetic field, and the three spiral blades evenly distributed on the impeller rotor 5 rotate at high speed to form a vacuum in the small end shell 1 of the device. The blood is inhaled from the shell 1 at the small end, and after passing through the guide wheel blades on the guide wheel 2 at the small end, the blood smoothly enters the groove of the impeller rotor 5. The impeller rotor 5 rotates continuously to squeeze the blood into the guide wheel 6 at the large end, and passes through the large end guide wheel 6. End housing 4 flows out. Under the action of the guide wheel vanes on the big end guide wheel 6, the blood changes from the original high-speed circular motion to a relatively stable axial flow. By adjusting the parameters of the frequency converter 13, the rotation speed of the impeller rotor 5 can be changed, thereby adjusting the output pressure and flow of the blood pump to meet the needs of different patients.

The rotating speed can reach 8000-12000 rpm, so that the average output flow of the blood pump 16 can reach 5-8 L/Min, and the average pressure can reach 1.33×104Pa (100mmHg).

Claims (4)

1. an outfield drives cone rotor artificial heart auxiliary device, it is characterized in that: described device places alternating magnetic field, this device comprises the little end housing (1) that links to each other with blood vessel, big end housing (4), intermediate case (3), the big end of intermediate case (3) and small end are tightly connected with little end housing (1) and big end housing (4) respectively, fixedly mounting outer surface in little end housing (1) and the big end housing (4) respectively has the small end guide wheel (2) of impeller and holds guide wheel (6) greatly, in described intermediate case (3), in the space that small end guide wheel (2) and big end guide wheel (6) constitute vane rotor (5) is set, axle (11) is set in the described vane rotor (5), fixed installation permanent magnetism magnetic stripe (12) between vane rotor (5) and axle (11), gapped between described vane rotor (5) and small end guide wheel (2) and the big end guide wheel (6).

2. outfield according to claim 1 drives cone rotor artificial heart auxiliary device, it is characterized in that: on described small end guide wheel (2) and the big end guide wheel (6) two-stage stairstepping circular groove is set respectively, fixedly mount the axial permanent magnetic bearer ring (7) of axial charging and the radial permanent magnet outer race (9) of radial magnetizing in the two-stage stairstepping circular groove respectively, the polarity of the described axial permanent magnetic bearer ring (7) that is positioned at small end guide wheel (2) and big end guide wheel (6) is opposite; Described axle (11) two ends are provided with footstalk, the radial permanent magnet bearing inner ring (8) of fixed installation radial magnetizing on the footstalk, described radial permanent magnet bearing inner ring (8) is positioned at radial permanent magnet outer race (9), and opposite with the polarity of radial permanent magnet outer race (9), described radial permanent magnet bearing inner ring (8) and axial permanent magnetic bearer ring (7), radial permanent magnet outer race (9) are gapped between the two.

3. outfield according to claim 1 and 2 drives cone rotor artificial heart auxiliary device, and it is characterized in that: described permanent magnetism magnetic stripe (12) is made of 4 1/4 columnar permanent magnetism magnetic stripes, and radial magnetizing, and adjacent two polar N, S extreme direction are opposite.

4. outfield according to claim 3 drives cone rotor artificial heart auxiliary device, it is characterized in that: described alternating magnetic field is formed by being arranged on external radially equally distributed some even number coils (10), and this coil is connected with the terminal of converter (13) respectively.

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