CN109010970B

CN109010970B - Pump device for cardiovascular surgery

Info

Publication number: CN109010970B
Application number: CN201810635101.4A
Authority: CN
Inventors: 刘淼淼; 周美英
Original assignee: First Affiliated Hospital of Xian Jiaotong University
Current assignee: First Affiliated Hospital of Xian Jiaotong University
Priority date: 2018-06-15
Filing date: 2018-06-15
Publication date: 2021-03-05
Anticipated expiration: 2038-06-15
Also published as: CN109010970A

Abstract

The invention discloses a pump device for cardiovascular surgery, comprising: a casing, the upper end of which is formed with a liquid inlet, and one side of the lower end is formed with a liquid outlet; a rotor is arranged in the casing, The rotor has a plurality of circumferentially arranged blades, and the rotor drives the blood to flow into the casing from the liquid inlet and flow out from the liquid outlet through rotation; the driving assembly includes a first exciting magnetic part and a second exciting magnetic part; The second excitation magnetic member is arranged on the rotor, and electromagnetic excitation is performed between the first excitation magnetic member and the second excitation magnetic member to drive the rotor to levitate and rotate; the flow driving part, It is used to urge the blood flow between the lower end of the rotor and the housing to prevent the blood from forming a thrombus.

Description

Pump device for cardiovascular surgery

Technical Field

The invention relates to the technical field of cardiovascular treatment, in particular to a pump device for cardiovascular surgery.

Background

Artificial pumps are commonly used to power blood flow within a patient's vascular tube. Manual pump among the prior art is mostly the centrifugal pump, and this pump generally includes a casing and sets up the rotor in the casing, and the casing is the toper big-end-up approximately, and the upper end of casing is formed with the inlet of the vertical orientation that supplies blood to get into, and one side of the lower part of casing is formed with the liquid outlet of radial orientation, is provided with the blade on the rotor, through driving the rotor, under the blade effect for blood gets into in the casing from the inlet, and flows out from the liquid outlet with certain velocity of flow.

The above-described pumps of the prior art and others of the prior art all suffer from the following problems:

the space between the lower end of the rotor and the bottom of the inner cavity of the shell is inevitably filled with blood, and the fluidity of the blood is very poor, or the blood does not flow basically, so that the blood is very easy to form thrombus, and the thrombus formed by the blood is harmful to patients.

Disclosure of Invention

In view of the above technical problems in the prior art, embodiments of the present invention provide a pump device for cardiovascular surgery.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

a pump device for cardiovascular surgery, comprising:

a shell, wherein a liquid inlet is formed at the upper end of the shell, and a liquid outlet is formed at one side of the lower end of the shell;

the rotor is arranged in the shell and provided with a plurality of blades which are circumferentially arranged, and the rotor drives blood to flow into the shell from the liquid inlet and flow out from the liquid outlet through rotation;

a drive assembly including a first excitation magnet and a second excitation magnet; the second excitation magnetic piece is arranged on the rotor, and the first excitation magnetic piece and the second excitation magnetic piece are electromagnetically excited to drive the rotor to suspend and rotate;

a flow driving part for urging a flow of blood between a lower end of the rotor and the housing to prevent the blood from forming a thrombus.

Preferably, a partition plate is arranged in the shell at a position close to the lower position, and an installation space is enclosed between the partition plate and the bottom of the shell; wherein:

the rotor is located above the partition plate, and the driving assembly is disposed in the installation space.

Preferably, the flow driving part includes:

a spiral flow channel formed on an upper plate surface of the partition plate, the blood between the rotor and the partition plate flowing horizontally and radially inward along the spiral flow channel when the rotor rotates;

and the flow guide pore canal extends from the lower end of the rotor to a position, close to the upper end, of the rotor so as to guide the blood flowing along the spiral flow channel to flow upwards from the lower end of the rotor so as to be converged with the blood at the liquid inlet.

Preferably, the flow driving part includes:

the cylinder body is made of flexible materials, the upper end port of the cylinder body is connected with the lower end of the rotor in a sealing mode, and the rotor can rotate relative to the cylinder body; the lower port of the cylinder is hermetically connected with the partition plate; the wall of the cylinder body is provided with a plurality of through holes;

the play driving group is used for driving the rotor to play up and down when the rotor rotates; wherein:

when the rotor moves upwards, negative pressure is formed in the barrel body to enable blood outside the barrel body to flow towards the direction inside the barrel body through the through hole, and when the rotor moves downwards, the volume of the barrel body is contracted to enable the blood inside the barrel body to flow towards the outside of the barrel body.

Preferably, the play drive set includes:

the first magnetic ring is arranged on the partition plate;

a second magnetic ring disposed at a lower end of the rotor; wherein:

the first magnetic ring and the second magnetic ring are arranged oppositely and formed by butting fan-shaped magnetic sections with equal number; the opposite magnetic poles of two adjacent fan-shaped magnetic sections in the first magnetic ring and the second magnetic ring are in the same direction; wherein:

when the rotor rotates, the fan-shaped magnetic sections in the first magnetic ring and the fan-shaped magnetic sections in the second magnetic ring are switched between the homopolar relative state and the heteropolar relative state, so that the magnetic acting force between the first magnetic ring and the magnetic ring is switched between the magnetic repulsion force and the magnetic attraction force.

Preferably, the first magnetic ring is embedded in the partition plate, and the upper end face of the first magnetic ring is flush with the upper plate face of the partition plate; the second magnetic ring is embedded in the rotor and is flush with the lower end face of the rotor.

Preferably, the lower extreme middle part of rotor still is provided with the pivot, the rotor wears to establish the middle part of baffle stretch into to in the installation space, the lower extreme of pivot is provided with the mounting panel, wherein:

the first excitation magnetic piece is arranged on the partition plate, and the second excitation magnetic piece is arranged on the mounting plate;

at least one of the first excitation magnetic member and the second excitation magnetic member includes an iron core and a coil wound around the iron core.

Preferably, a magnetic isolation plate is arranged on the lower plate surface of the partition plate, and the first excitation magnetic member is arranged on the magnetic isolation plate.

Compared with the prior art, the pump device for cardiovascular surgery disclosed by the invention has the beneficial effects that: according to the invention, the flow driving part is arranged to actuate the blood between the lower end of the rotor and the clapboard to flow so as to prevent the blood at the position from forming thrombus, and the risk that the thrombus blocks the blood vessel of a patient in the operation process is effectively reduced.

Drawings

Fig. 1 is a front view of a pump device for cardiovascular surgery provided in embodiment 1 of the present invention.

Fig. 2 is a front view of a pump device for cardiovascular surgery provided in embodiment 2 of the present invention.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is a view showing a state of use of the pump device for cardiovascular surgery according to embodiment 2 of the present invention (the rotor is in an upward-floating state).

Fig. 5 is an enlarged view of a portion B of fig. 4.

Fig. 6 is a view showing a state of use of the pump device for cardiovascular surgery according to embodiment 2 of the present invention (the rotor is in a downwardly floating state).

Fig. 7 is an enlarged view of a portion C of fig. 6.

In the figure:

10-a housing; 11-a liquid inlet; 12-a liquid outlet; 13-a separator; 14-installation space; 15-magnetic separator plate; 16-a blade; 20-a rotor; 21-a rotating shaft; 22-a mounting plate; 30-a drive assembly; 31-a first excitation magnet; 32-a second excitation magnet; 41-a baffle plate; 42-a spiral flow channel; 43-a flow guide channel; 51-a cylinder body; 511-a via; 512-a first rigid ring; 513-a second rigid ring; 514-a bearing; 52-a second magnetic ring; 53-first magnetic ring.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 7, an embodiment of the present invention discloses a pump device for cardiovascular surgery, which is used for cardiac surgery, which may completely or partially replace the function of the heart for powering the flow of blood. The pump device comprises a housing 10, a rotor 20, a drive assembly 30 and a flow drive. The casing 10 is substantially tapered with a small top and a large bottom, a liquid inlet 11 is formed at the upper end of the casing 10, a liquid outlet 12 is formed at one side of the casing 10 at a lower position, a partition plate 13 is arranged in the casing 10, and the partition plate 13 divides the casing 10 into an upper space above the partition plate 13 and an installation space 14 below the partition plate 13. The rotor 20 is disposed in the upper space, a plurality of blades 16 are circumferentially disposed on the rotor 20, when the blades 16 rotate along with the rotor 20, the rotation of the blades 16 causes blood to flow in from the liquid inlet 11 and flow out from the liquid outlet 12 at a certain speed, and this action of the rotor 20 is the same as the action principle of a pump in the prior art, and belongs to the known art, and is not described herein again; the middle part of the lower end of the rotor 20 is provided with a rotating shaft 21, the rotating shaft 21 penetrates through the partition plate 13 and extends into the installation space 14, the lower end of the rotating shaft 21 is provided with an installation plate 22, and the part of the rotating shaft 21 penetrating through the partition plate 13 is sealed to prevent blood from flowing into the installation space 14 from the upper space. The driving assembly 30 is configured to drive the rotor 20 to rotate and enable the rotor 20 to be in a levitated state, and specifically, the driving assembly 30 includes a first excitation magnetic member 31 and a second excitation magnetic member 32, where the first excitation magnetic member 31 is fixed on the lower plate surface of the partition plate 13, and the second excitation magnetic member 32 is fixed on the mounting plate 22 and is opposite to the first excitation magnetic member 31, where the first excitation magnetic member 31 and the second excitation magnetic member 32 are both electromagnetic excitation magnetic members, and the rotor 20 can be rotated in the levitated state through an electromagnetic excitation action when corresponding currents are applied to the first excitation magnetic member and the second excitation magnetic member (the electromagnetic excitation action enables the rotor 20 to be rotated in the levitated state belongs to common knowledge, and is not described herein again). The flow driving part is used for driving the blood between the lower end of the rotor 20 and the partition plate 13 to flow so as to prevent the blood from forming thrombus.

The invention effectively reduces the risk of thrombus blocking the blood vessel of the patient in the operation process by arranging the flow driving part to drive the blood between the lower end of the rotor 20 and the clapboard 13 (if the flow driving part is not arranged, the blood at the position does not flow basically or flows slowly) to flow so as to prevent the blood at the position from forming thrombus.

The following embodiments of the present invention provide two types and structures of flow driving parts, respectively.

Example 1

As shown in fig. 1, in the present embodiment, the flow driving section includes: spiral flow passages 42 and flow guide passages 43. The spiral flow channel 42 is formed by a spiral baffle 41 arranged on the upper plate surface of the partition plate 13, the spiral flow channel 42 is defined between each adjacent inner ring and outer ring of the spiral baffle 41, at this time, the rotation direction of the rotor 20 needs to be consistent with the extending direction of the spiral flow channel 42, and the consistency is that: when the rotor 20 rotates, the blood between the partition 13 and the lower end of the rotor 20 is caused to flow inwardly along the spiral flow path 42. The spiral flow path 42 causes the blood to flow more spirally inward at a higher flow rate. The diversion channel 43 extends from the lower end of the rotor 20 to a position of the rotor 20 close to the upper end, so as to guide the blood flowing along the spiral channel 42 to flow upward from the lower end of the rotor 20 to join with the blood at the liquid inlet 11, that is, the blood flowing along the spiral channel 42 is accelerated to a certain extent, enters the diversion channel through the lower port of the diversion channel, passes through the diversion channel, flows out from the port at the upper end of the diversion channel 43 to mix with the blood flowing from the liquid inlet 11, and then flows out from the liquid outlet 12 on the housing 10.

In the present embodiment, the flow driving part having the spiral flow path 42 and the guide hole 43 causes the blood between the lower end of the rotor 20 and the partition plate 13 to flow in the radially inward direction, so that the blood at that position can be prevented from forming thrombus.

Example 2

In the present embodiment, as shown in fig. 2 to 7, the flow driving portion in the present embodiment is different from the flow driving portion of embodiment 1, and includes: a cylinder 51 and a play drive set. The cylinder 51 is made of a flexible material, for example, silicone, so that the inner volume of the cylinder 51 has a contractible ability. The cylinder 51 is disposed between the lower end of the rotor 20 and the partition plate 13, specifically, the upper port of the cylinder 51 is provided with a first rigid ring 512, the first rigid ring 512 is clamped in the lower end of the rotor 20, bearings 514 are disposed on the inner side and the outer side of the first rigid ring 512, so that the cylinder 51 does not rotate with the rotor 20 when the rotor 20 rotates, the rotor 20 can follow when the rotor 20 axially moves, and the upper port of the cylinder 51 is hermetically connected with the rotor 20 by a sealing ring (not shown in the drawing), the lower port of the cylinder 51 is provided with a second rigid ring 513, the second rigid ring 513 is embedded in the partition plate 13, and the lower port of the cylinder 51 is hermetically connected with the partition plate 13 by the sealing ring. The wall of the cylinder body 51 is provided with a plurality of through holes 511; the through hole 511 allows blood to pass therethrough. The play driving set is used for driving the rotor 20 to play up and down when the rotor 20 rotates. Thus, as shown in fig. 6 and 7, when the rotor 20 moves upward, a negative pressure is formed in the cylinder 51 to make the blood outside the cylinder 51 flow toward the inside of the cylinder 51 through the through hole 511; as shown in fig. 4 and 5, when the rotor 20 is shifted downward, the volume of the cylinder 51 is contracted so that the blood in the cylinder 51 flows toward the outside of the cylinder 51. In the embodiment, the rotor 20 is driven by the play driving group to axially play, so that the blood between the lower end of the rotor 20 and the partition plate 13 performs reciprocating radial flow, and the blood at the position is prevented from forming thrombus.

The advantage of providing the flow driving portion in embodiment 2 is that: on the one hand, as in example 1, the blood is caused to flow to prevent thrombus formation, and on the other hand, the reciprocating radial flow of the blood has a certain scouring action on the lower end of the rotor 20 and the partition plate 13, thereby effectively preventing the blood from adhering to a certain position of the rotor 20 and the partition plate 13 for a long period of time, and effectively preventing thrombus formation due to the adhesion to a solid body for a long period of time.

In a preferred embodiment, as shown in fig. 2 and 3, the play driving set includes: a first magnetic ring 53 and a second magnetic ring 52. The first magnetic ring 53 is arranged on the partition plate 13; the second magnetic ring 52 is arranged at the lower end of the rotor 20; wherein: the first magnetic ring 53 and the second magnetic ring 52 are oppositely arranged, and the first magnetic ring 53 and the second magnetic ring 52 are formed by butting fan-shaped magnetic sections with equal numbers; and the opposite magnetic poles of two adjacent fan-shaped magnetic segments in the first magnetic ring 53 and the second magnetic ring 52 face the same direction. In this way, when the rotor 20 rotates, the sector-shaped magnetic segments in the first magnetic ring 53 and the sector-shaped magnetic segments in the second magnetic ring 52 are switched between the homopolar opposite state and the heteropolar opposite state, so that the magnetic force between the first magnetic ring 53 and the second magnetic ring 52 is switched between the magnetic repulsion force and the magnetic attraction force. Because the magnetic acting force between the first magnetic ring 53 and the second magnetic ring 52 is continuously switched between the magnetic repulsion force and the magnetic attraction force, the rotor 20 continuously generates axial movement while rotating. For example, as shown in fig. 4, when the rotor 20 rotates to an angular range that causes the two magnetic rings to generate magnetic attraction, the rotor 20 moves downward, thereby causing a radially outward flow of blood between the rotor 20 and the partition 13; as shown in fig. 6, when the rotor 20 rotates to an angular range in which the two magnetic rings generate magnetic repulsive force, the rotor 20 moves upward, thereby generating a radially inward flow of blood between the rotor 20 and the diaphragm 13. The magnetic force action of the two magnetic rings is used as the play driving part, so that the play driving part has the advantages that: the axial play of the rotor 20 driven by mechanical contact is avoided and the magnetic action is softer than the mechanical action so that no impact is generated on the rotor 20. Preferably, the first magnetic ring 53 is embedded in the partition plate 13, and the upper end surface of the first magnetic ring 53 is flush with the upper plate surface of the partition plate 13; the second magnetic ring 52 is embedded in the rotor 20 and is flush with the lower end surface of the rotor 20 to prevent the two magnetic rings from blocking the blood flow, so that the two magnetic rings can be prevented from obstructing the blood flow.

In a preferred embodiment, a magnetic isolation plate 15 is disposed on the lower plate surface of the partition plate 13, and the first excitation magnetic member 31 is disposed on the isolation plate, wherein the magnetic isolation plate 15 is used for preventing the magnetic action generated between the two excitation magnetic members from influencing the magnetic action of the two magnetic rings.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims

1. A pump device for cardiovascular surgery, comprising:

The shell has a liquid inlet formed on its upper end and a liquid outlet formed on one side of its lower end;

a rotor, which is arranged in the casing, the rotor has a plurality of circumferentially arranged blades, and the rotor drives blood to flow into the casing from the liquid inlet and flow out from the liquid outlet through rotation;

A drive assembly includes a first exciting magnetic member and a second exciting magnetic member; the second exciting magnetic member is arranged on the rotor, and electromagnetic interference is performed between the first exciting magnetic member and the second exciting magnetic member Excitation action drives the rotor to suspend and rotate;

a flow driving part for actuating the blood flow between the lower end of the rotor and the housing to prevent the blood from forming a thrombus;

A partition is arranged at a lower position inside the shell, and an installation space is enclosed between the partition and the bottom of the shell; wherein:

The rotor is located above the partition plate, and the drive assembly is arranged in the installation space;

The flow drive part includes:

A cylinder is made of a flexible material, the upper port of the cylinder is sealed with the lower end of the rotor, and the rotor can rotate relative to the cylinder; the lower port of the cylinder is connected to the partition plate sealing connection; a plurality of through holes are opened on the cylinder wall of the cylinder body;

A movement driving group, which is used for driving the rotor to move up and down when the rotor rotates; wherein:

When the rotor moves upward, a negative pressure is formed in the cylinder, so that the blood outside the cylinder flows through the through hole toward the inside of the cylinder. When the rotor moves downward, the pressure of the cylinder is The volume shrinks causing the blood in the barrel to flow out of the barrel.

2 . The pump device for cardiovascular surgery according to claim 1 , wherein the play drive group comprises: 2 .

a first magnetic ring, which is arranged on the partition;

The second magnetic ring, which is arranged at the lower end of the rotor; wherein:

The first magnetic ring and the second magnetic ring are arranged opposite to each other, and the first magnetic ring and the second magnetic ring are formed by butt-jointing sector-shaped magnetic segments with an equal number; and the first magnetic ring and the The opposite magnetic poles of two adjacent sector-shaped magnetic segments in the second magnetic ring have the same orientation; wherein:

When the rotor rotates, the sector-shaped magnetic segments in the first magnetic ring and the sector-shaped magnetic segments in the second magnetic ring are switched between the same-pole opposite state and the opposite-pole opposite state, so that the first The magnetic force between the magnetic ring and the magnetic ring switches between magnetic repulsion and magnetic attraction.

3 . The pump device for cardiovascular surgery according to claim 2 , wherein the first magnetic ring is embedded in the spacer, and the upper end surface of the first magnetic ring is connected to the spacer. 4 . The upper surface of the plate is flush; the second magnetic ring is embedded in the rotor and is flush with the lower end surface of the rotor.

4 . The pump device for cardiovascular surgery according to claim 1 , wherein a rotating shaft is further provided in the middle part of the lower end of the rotor, and the rotor penetrates the middle part of the partition plate and extends into the installation. 5 . In the space, the lower end of the rotating shaft is provided with a mounting plate, wherein:

The first excitation magnetic member is arranged on the partition plate, and the second excitation magnetic member is arranged on the mounting plate;

At least one of the first excitation magnetic member and the second excitation magnetic member includes an iron core and a coil wound on the iron core.

5 . The pump device for cardiovascular surgery according to claim 1 , wherein a magnetic isolation plate is disposed on the lower surface of the partition plate, and the first excitation magnetic member is disposed on the magnetic isolation plate. 6 . superior.