CN115474950A

CN115474950A - Blood pump capable of preventing blood coagulation

Info

Publication number: CN115474950A
Application number: CN202110661223.2A
Authority: CN
Inventors: 高琪; 何博; 刘星利; 魏润杰
Original assignee: Zhejiang Diyuan Medical Equipment Co ltd
Current assignee: Zhejiang Diyuan Medical Equipment Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-12-16
Also published as: JP2023534345A; WO2022262242A1; JP7426503B2

Abstract

The embodiment of the application discloses can prevent blood pump of blood coagulation, blood pump includes: a housing having an accommodating chamber; an outlet disposed at one end of the housing; the impeller is rotatably arranged in the accommodating cavity; a drive device comprising a body and a drive shaft; the driving shaft is rotatably arranged on the body and connected with the impeller; the driving device is used for driving the impeller to rotate in the accommodating cavity through the driving shaft; an auxiliary structure arranged on the impeller and/or the driving device and used for enabling the blood in the first space to flow; the first space is a space formed between the impeller and the body; the drive shaft drives the impeller to rotate, the impeller is used for pushing blood to flow out of the outlet in a first direction, and the auxiliary structure is used for enabling the blood in the first space to flow in a second direction. The blood pump in the embodiment of the application can prevent blood coagulation in the first space and improve the safety of the blood pump in use.

Description

Blood pump capable of preventing blood coagulation

Technical Field

The present application relates to a blood pump capable of preventing blood coagulation.

Background

The blood pump is generally used to promote normal blood circulation of a medical subject during an operation, for example, by operating the blood pump, blood in a heart ventricle can be pumped into an artery of the medical subject, so as to ensure normal blood circulation of the medical subject, and to enable normal blood circulation of the medical subject when the medical subject is subjected to a heart related operation.

At present, the blood pump mainly uses a shaft pump as a main part, a driving device drives an impeller to rotate to provide set flow and pressure, in the prior art, an obvious low-speed area can be formed between the impeller and the driving device, and when the blood pump runs for a long time, the low-speed area can generate obvious blood coagulation effect to change the flow state of blood to block the normal running of the blood pump and reduce the flow of the blood pump; when the thrombus volume caused by blood coagulation is large, the blood pump can also be caused to fail, and even the problems of thromboembolism, stroke and the like can be caused, thereby influencing the life safety of patients.

Disclosure of Invention

In view of this, the present disclosure provides a blood pump capable of preventing blood coagulation.

In order to achieve the purpose, the technical scheme of the application is realized as follows:

the embodiment of the application provides a blood pump that can prevent blood coagulation, blood pump includes:

a housing having an accommodating chamber;

an outlet disposed at one end of the housing;

the impeller is rotatably arranged in the accommodating cavity;

a drive device including a body and a drive shaft; the driving shaft is rotatably arranged on the body and is connected with the impeller; the driving device is used for driving the impeller to rotate in the accommodating cavity through the driving shaft;

an auxiliary structure arranged on the impeller and/or the driving device and used for enabling the blood in the first space to flow; the first space is a space formed between the impeller and the body;

the impeller is used for pushing blood to flow out of the outlet in a first direction under the condition that the driving shaft drives the impeller to rotate, and the auxiliary structure is used for enabling the blood in the first space to flow in a second direction.

In some alternative implementations, the impeller includes:

a seat portion located outside the accommodating chamber and forming the outlet with the first end of the housing;

the auxiliary structure includes:

the flow guide channel is arranged on the seat part and is respectively communicated with the accommodating cavity and the first space;

under the condition that the driving shaft drives the impeller to rotate, the blood in the first space flows into the accommodating cavity from the diversion channel in the second direction, and the impeller is used for pushing the blood in the accommodating cavity to flow out of the outlet in the first direction.

In some optional implementation manners, the cross-sectional shape of the flow guide channel is circular or strip-shaped;

the auxiliary structure comprises at least two flow guide channels which are annularly arranged or radially arranged.

In some optional implementation manners, the flow guide channel is arranged obliquely, and the oblique direction of the flow guide channel is matched with a third direction, wherein the third direction is a direction in which blood flows out from the outlet in the radial direction of the shell.

In some optional implementations, the auxiliary structure includes:

an auxiliary impeller rotatably disposed in the first space;

under the condition that the driving shaft drives the impeller to rotate, the impeller is used for pushing the blood in the containing cavity to flow out from the outlet in a first direction, and the auxiliary impeller is used for pushing the blood in the first space to flow in a second direction.

In some alternative implementations, the auxiliary impeller is in contact with or forms a first gap with an outer surface of the impeller; the outer surface of the impeller is the surface facing the body.

In some alternative implementations, the impeller includes:

the auxiliary structure includes:

a first guide portion provided on an outer surface of the seat portion and inclined toward the outlet side;

when the driving shaft drives the impeller to rotate, the impeller is used for pushing the blood in the accommodating cavity to flow out from the outlet in a first direction, and the blood in the first space flows to the outlet along the first guide part in a second direction.

In some optional implementations, the first guide is in the shape of a circular truncated cone.

In some optional implementations, the auxiliary structure includes:

a second guide part arranged at the first end of the body and inclined to be far away from the outlet side;

when the driving shaft drives the impeller to rotate, the impeller is used for pushing the blood in the accommodating cavity to flow out from the outlet in a first direction, and the blood in the first space flows along the second guide part in a second direction.

In some optional implementations, the ontology further includes:

a columnar part connected with the second guide part;

when the driving shaft drives the impeller to rotate, the blood in the first space flows along the surface of the second guide part in a second direction and passes through the surface of the columnar part.

The blood pump in the embodiments of the present application includes: a housing having an accommodating chamber; an outlet disposed at one side of the housing; the impeller is rotatably arranged in the accommodating cavity; a drive device including a body and a drive shaft; the driving shaft is rotatably arranged on the body and is connected with the impeller; the driving device is used for driving the impeller to rotate in the accommodating cavity through the driving shaft; an auxiliary structure arranged on the impeller and/or the driving device and used for enabling the blood in the first space to flow; the first space is a space formed between the impeller and the body; under the condition that the driving shaft drives the impeller to rotate, the impeller is used for pushing blood to flow out of the outlet in a first direction, and the auxiliary structure is used for enabling the blood in the first space to flow in a second direction; the auxiliary structure enables the blood in the first space to flow in the second direction, so that coagulation in the first space can be prevented, and the safety of the blood pump is improved.

Drawings

FIG. 1 is a schematic diagram of an alternative prior art blood pump;

FIG. 2 is a schematic diagram of an alternative configuration of an anti-clotting blood pump according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an alternative partial configuration of a blood pump capable of preventing clotting according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an alternative partial configuration of a blood pump capable of preventing clotting provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating an alternative configuration of a portion of a blood pump capable of preventing clotting according to an exemplary embodiment of the present disclosure;

FIG. 9 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 10 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 11 is a schematic diagram of an alternative configuration of an anti-clotting blood pump according to an embodiment of the present disclosure;

FIG. 12 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 13 is a schematic diagram of an alternative partial configuration of a blood pump capable of anticoagulation according to the embodiments of the present disclosure;

FIG. 14 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 15 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 16 is a schematic diagram illustrating an alternative configuration of a portion of a blood pump configured to prevent clotting in accordance with an exemplary embodiment of the present disclosure;

FIG. 17 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing coagulation according to an embodiment of the present application;

FIG. 18 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 19 is a schematic diagram illustrating an alternative configuration of a portion of a blood pump configured to prevent clotting in accordance with an exemplary embodiment of the present disclosure;

FIG. 20 is a schematic view of an alternative configuration of a blood pump capable of preventing clotting provided by an embodiment of the present application;

FIG. 21 is a schematic diagram of an alternative partial structure of a blood pump capable of preventing blood coagulation according to an embodiment of the present application;

FIG. 22 is a schematic diagram illustrating an alternative configuration of a portion of a blood pump configured to prevent clotting in accordance with an exemplary embodiment of the present disclosure;

fig. 23 is a partial schematic view of an alternative blood pump capable of preventing blood coagulation according to an embodiment of the present disclosure.

Reference numerals are as follows: 101. an outlet; 102. an inlet; 103. a first space; 110. a housing; 112. an opening; 120. an impeller; 121. a connecting portion; 122. a blade; 123. a seat portion; 124. a flow guide channel; 125. a first guide portion; 131. a drive shaft; 132. a body; 1321. a second guide portion; 1322. a columnar portion; 140. and (4) assisting the impeller.

Detailed Description

Various combinations of the specific features in the embodiments described in the detailed description may be made without contradiction, for example, different embodiments may be formed by different combinations of the specific features, and in order to avoid unnecessary repetition, various possible combinations of the specific features in the present application will not be described separately.

In the description of the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connected" should be interpreted broadly, for example, as an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application are only used for distinguishing similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence order if allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.

The blood pump includes: housing 110, outlet 101, impeller 120, drive means and ancillary structure. The housing 110 has an accommodation chamber; the outlet 101 is disposed at one end of the housing 110; the impeller 120 is rotatably disposed in the accommodating cavity; the driving means includes a body 132 and a driving shaft 131; the driving shaft 131 is rotatably disposed on the body 132, and the driving shaft 131 is connected to the impeller 120; the driving device is used for driving the impeller 120 to rotate in the accommodating cavity through the driving shaft 131; auxiliary structures are arranged on the impeller 120 and/or the driving device, and the auxiliary structures are used for enabling blood in the first space 103 to flow; the first space 103 is a space formed between the impeller 120 and the body 132; when the driving shaft 131 drives the impeller 120 to rotate, the impeller 120 is used for pushing blood to flow out of the outlet 101 in a first direction, and the auxiliary structure is used for enabling the blood in the first space 103 to flow in a second direction; the auxiliary structure allows the blood in the first space 103 to flow in the second direction, so that the blood coagulation in the first space 103 can be prevented, and the safety of the blood pump can be improved.

In the embodiment of the present application, as shown in fig. 1, if there is no auxiliary structure, in the case where the driving shaft 131 drives the impeller 120 to rotate, the flow rate of blood in the first space 103 is low, and coagulation easily occurs at the driving shaft 131.

In the embodiment of the present application, the structure of the housing 110 is not limited as long as the housing 110 has the receiving cavity so that blood can flow in the receiving cavity. For example, the housing 110 has a cylindrical structure.

Here, the shape of the accommodation chamber is not limited. For example, the receiving cavity may be a cylindrical structure.

Here, the housing 110 may have an opening 112, and the opening 112 communicates with the receiving chamber such that at least a portion of the impeller 120 is rotatably disposed in the receiving chamber through the opening 112.

Here, the housing 110 may also have an inlet 102, the inlet 102 communicating with the receiving cavity so that blood can enter the receiving cavity from the inlet 102.

In the embodiment of the present application, the outlet 101 is disposed at one end of the housing 110, and the outlet 101 may be disposed on the housing 110 or disposed outside the housing 110. For example, as shown in fig. 2, the impeller 120 may include: a seat 123, the seat 123 being located outside the receiving cavity, the seat 123 and the first end of the housing 110 forming the outlet 101. Here, the structure of the seat 123 is not limited. For example, the seat portion 123 may have a truncated cone-shaped structure, so that the seat portion 123 can provide a guiding function for blood in the accommodating chamber.

In the embodiment of the present application, the structure of the impeller 120 is not limited as long as the impeller 120 can rotate to push the blood to flow.

For example, as shown in fig. 3, the impeller 120 includes a connecting portion 121, a blade 122, and a seat portion 123. The blades 122 are fixed to the outside of the connecting portion 121, and the seat portion 123 is disposed at the second end of the connecting portion 121, such that the seat portion 123 and the first end of the housing 110 form the outlet 101, and the second end of the connecting portion 121 is connected to the driving shaft 131.

In this example, the structure of the connection portion 121 is not limited. For example, the connection portion 121 may have a columnar structure. For another example, the connection portion 121 may include a first end and a second end. The first end of the connecting portion 121 is tapered, and the first end of the connecting portion 121 is close to the inlet 102 side, so as to provide a guiding function for blood through the first end of the connecting portion 121. The second end of the connecting portion 121 is a cylindrical structure, so that the second end of the connecting portion 121 is sleeved on the outer side of the driving shaft 131 and connected with the driving shaft 131. A portion between the first end of the connection part 121 and the second end of the connection part 121 has a cylindrical structure such that the portion between the first end and the second end is connected with the blade 122.

In this example, the configuration of the blade 122 is not limited. For example, the blades 122 may have a flat plate-like structure or a bent plate-like structure. The blades 122 may be equal-height blades 122 or unequal-height blades 122. As an example, the height of the blade 122 gradually increases from the leading edge of the blade 122 to the trailing edge of the blade 122; the leading edge of the vane 122 is the end near the inlet 102 side, and the trailing edge of the vane 122 is the end near the outlet 101 side.

In the present example, the number of blades 122 is not limited. For example, the number of the blades 122 may be one or two.

As an example, the impeller 120 may further include: at least one blade 122, at least one blade 122 is fixed on the peripheral side of the connecting part 121, and at least one blade 122 is used for pushing blood to flow; the blades 122 are used to push blood to flow in a first direction from the first end of the connection portion 121 to the second end of the connection portion 121 when the impeller 120 is driven to rotate by the driving shaft 131.

In the embodiment of the present application, the structure of the driving means is not limited as long as the driving means includes the driving shaft 131. For example, the drive means may comprise a motor.

Here, the structure of the body 132 is not limited. For example, the body 132 may be a cylindrical structure. As an example, the body 132 may be a body 132 of a motor, and the driving shaft 131 may be an output shaft of the motor.

Here, the implementation manner of the connection of the driving shaft 131 and the impeller 120 is not limited. For example, the impeller 120 and the drive shaft 131 may be connected by a spline or a flat key.

Here, the driving means is connected to the impeller 120 through the driving shaft 131 such that the impeller 120 is rotatably disposed in the receiving chamber.

In the embodiment of the present application, the structure of the auxiliary structure is not limited as long as the auxiliary structure can function to increase the flow velocity of blood in the first space 103.

Here, the auxiliary structure may be provided to the impeller 120, may be provided to the driving device, or may be provided to both the impeller 120 and the driving device.

In the embodiment of the present application, the impeller 120 is used for pushing the blood to flow out from the outlet 101 in a first direction, and the auxiliary structure is used for making the blood in the first space 103 flow in a second direction; the auxiliary structure enables the blood in the first space 103 to flow in the second direction, so that coagulation in the first space 103 can be prevented, and the safety of the blood pump in use is improved.

Here, the first direction is not limited. For example, the first direction may be a direction toward the outlet 101.

In some optional implementations of embodiments of the present application, the auxiliary structure may include: the flow guide channel 124 is arranged on the seat part 123, and the flow guide channel 124 is respectively communicated with the accommodating cavity and the first space 103; when the driving shaft 131 drives the impeller 120 to rotate, the blood in the first space 103 flows into the accommodating cavity from the diversion channel 124 in the second direction, and the impeller 120 is used for pushing the blood in the accommodating cavity to flow out from the outlet 101 in the first direction, so that the blood in the first space 103 flows in the second direction through the diversion channel 124, coagulation in the first space 103 can be prevented, and the safety of the blood pump can be improved.

In the present implementation, the cross-sectional shape of the flow guide channel 124 is not limited. For example, the cross-sectional shape of the flow guide channel 124 may be circular, strip, rectangular, or triangular.

In this implementation, the number of flow guide channels 124 is not limited. For example, the number of the flow guide passages 124 may be one or more.

As an example, the auxiliary structure may include at least two flow guide channels 124, and the at least two flow guide channels 124 are arranged in a ring shape. The at least two flow channels 124 may also be radially arranged. In the case that the at least two guide passages 124 are arranged in a ring shape, the at least two guide passages 124 may be arranged in a circle, as shown in fig. 3 and 4. The at least two flow guide channels 124 may be provided in two turns, as shown in fig. 5 and 6. In the case that the at least two flow guide channels 124 are radially arranged, the at least two flow guide channels 124 may include four strip-shaped flow guide channels 124, and the four strip-shaped flow guide channels 124 are radially arranged, as shown in fig. 7 and 8.

In this implementation, as shown in fig. 9 and 10, the flow guide channel 124 may be disposed obliquely, and the oblique direction of the flow guide channel 124 is not limited. For example, the inclined direction of the diversion channel 124 may match the third direction, so that the blood in the first space 103 can more easily enter the accommodating cavity through the diversion channel 124, and flow out of the outlet 101 in the first direction by being pushed by the impeller. The inclined direction of the diversion channel 124 matches the third direction, and may be the same as the inclined direction of the diversion channel 124, or may be substantially the same as the inclined direction of the diversion channel 124. The third direction is a direction in which blood flows out from the outlet in a radial direction of the housing. Of course, the flow guide channel 124 may not be inclined, and the opening of the flow guide channel 124 may be perpendicular to the outer surface of the seat 123.

In some optional implementations of embodiments of the present application, as shown in fig. 11, the auxiliary structure may include: the auxiliary impeller 140. The auxiliary impeller 140 is rotatably disposed in the first space 103; under the condition that the driving shaft 131 drives the impeller 120 to rotate, the impeller 120 is used for pushing the blood in the accommodating cavity to flow out from the outlet 101 in a first direction, and the auxiliary impeller 140 is used for pushing the blood in the first space 103 to flow in a second direction; therefore, blood coagulation can be prevented from occurring in the first space 103, and the safety of the blood pump can be improved.

In the present embodiment, the structure of the auxiliary impeller 140 is not limited.

For example, the expeller 140 may be an axial flow impeller, a rearward facing centrifugal impeller, or a forward facing centrifugal impeller. When the auxiliary impeller 140 is an axial-flow impeller, the shape of the auxiliary impeller 140 may be a forward-curved type, a radial type, a single plate type, a wing type, or the like. When the auxiliary impeller 140 is a backward centrifugal impeller, the shape of the auxiliary impeller 140 may be a single plate type, a circular arc type, a wing type, or the like. When the auxiliary impeller 140 is a forward centrifugal impeller, the auxiliary impeller 140 may be shaped as a flat plate blade, a circular narrow blade, a circular arc blade, a wing-shaped blade, or a flat plate curved backward blade.

As an example, the auxiliary impeller 140 may include an auxiliary blade 122, and the blood in the first space 103 may be pushed to flow in the second direction by the auxiliary blade 122.

Here, the number of the auxiliary blades 122 is not limited. For example, the number of the auxiliary blades 122 may be one or more, as shown in fig. 13, 15, 17, and 19.

Here, the shape of the auxiliary blade 122 is not limited. For example, the auxiliary blade 122 may be a straight plate-like structure. For another example, as shown in fig. 13, 15, 17, and 19, the auxiliary blade 122 may have a bent plate-like structure.

In the present embodiment, the auxiliary impeller 140 is not limited to be rotatably disposed in the first space 103. For example, the auxiliary impeller 140 may be fixed to the driving shaft 131 so that the auxiliary impeller 140 is rotated by the driving shaft 131. As another example, the supplementary impeller 140 may be fixed to the impeller 120 so that the supplementary impeller 140 is rotated by the impeller 120.

In the present embodiment, the distance between the auxiliary impeller 140 and the impeller 120 is not limited.

For example, the auxiliary impeller 140 is in contact with the outer surface of the impeller 120, which is the surface facing the body 132 as shown in fig. 12 and 14, so as to reduce the space for disposing the auxiliary impeller 140.

For another example, the auxiliary impeller 140 and the outer surface of the impeller 120 form a first gap, and as shown in fig. 16 and 18, when the auxiliary impeller 140 pushes the blood to flow in the second direction, the blood inside the first gap flows in the axial direction in which the auxiliary impeller 140 rotates, so that the blood in the first space 103 can flow in both the second direction and the axial direction in which the auxiliary impeller 140 rotates, and coagulation in the first space 103 can be further prevented, thereby improving the safety of the blood pump.

Note that fig. 12 and 13 are a set of views of the same structure, and fig. 13 is a bottom view of fig. 12. Fig. 14 and 15 are views showing the same structure, and fig. 15 is a bottom view of fig. 14. Fig. 16 and 17 are views showing the same structure, and fig. 17 is a bottom view of fig. 16. Fig. 18 and 19 are views showing the same structure, and fig. 19 is a bottom view of fig. 18.

In some optional implementations of embodiments of the present application, as shown in fig. 20 and 21, the auxiliary structure may include: the first guide portion 125; a first guide portion 125 is provided on an outer surface of the seat portion 123, the first guide portion 125 being inclined toward the outlet 101; when the driving shaft 131 drives the impeller 120 to rotate, the impeller 120 is used for pushing the blood in the accommodating cavity to flow out of the outlet 101 in a first direction, the blood in the first space 103 flows to the outlet 101 along the first guide part 125 in a second direction, so that the blood in the first space 103 flows in the second direction through the first guide part 125, and the blood in the first space 103 and the blood at the outlet 101 are gathered together and pushed to flow by the impeller 120; therefore, blood coagulation can be prevented from occurring in the first space 103, and the safety of the blood pump can be improved.

In the present embodiment, the structure of the first guide portion 125 is not limited as long as the first guide portion 125 is inclined toward the outlet 101. For example, the first guide portion 125 may have a circular truncated cone shape so that blood smoothly flows along the surface of the first guide portion 125. For example, the first guide 125 may have a truncated pyramid shape.

In the present embodiment, the cross-sectional shape of the first guide portion 125 is not limited. For example, the cross-sectional shape of the first guide portion 125 may be circular, triangular, or rectangular.

As an example, the first guide portion 125 has a circular cross-section; the outer diameter of the first guide part 125 gradually increases from the first end of the first guide part 125 to the second end of the first guide part 125. For example, the outer surface of the first guide portion 125 is a convex surface. For another example, the outer surface of the first guide portion 125 is a concave surface. For another example, the outer surface of the first guide portion 125 is a planar surface.

In some optional implementations of embodiments of the present application, as shown in fig. 20, the auxiliary structure may include: a second guide portion 1321, the second guide portion 1321 being provided at the first end of the body 132, the second guide portion 1321 being inclined to a side away from the outlet 101; when the impeller 120 is driven by the driving shaft 131 to rotate, the impeller 120 is used for pushing the blood in the accommodating cavity to flow out from the outlet 101 in the first direction, and the blood in the first space 103 flows along the second guide portion 1321 in the second direction, so that the blood in the first space 103 flows in the second direction through the second guide portion 1321, coagulation in the first space 103 can be prevented, and the safety of the blood pump can be improved.

In the present embodiment, the structure of the second guide portion 1321 is not limited as long as the second guide portion 1321 is inclined away from the outlet 101. For example, the second guide portion 1321 may have a circular truncated cone shape so that blood smoothly flows along the surface of the second guide portion 1321. For example, the second guide portion 1321 may have a prism shape.

In the present embodiment, the cross-sectional shape of the second guide portion 1321 is not limited. For example, the cross-sectional shape of the second guide portion 1321 may be circular, triangular, or rectangular.

As an example, the second guide portion 1321 has a circular cross section; the outer diameter of the second guide portion 1321 gradually increases from the first end of the second guide portion 1321 to the second end of the second guide portion 1321. For example, the outer surface of the second guide portion 1321 is a convex surface. For another example, the outer surface of the second guide portion 1321 is a concave surface. For another example, the outer surface of the second guide portion 1321 is a planar surface.

In this implementation, as shown in fig. 20, the body 132 may further include: a columnar portion 1322, the columnar portion 1322 being connected to the second guide portion 1321; when the impeller 120 is driven by the driving shaft 131 to rotate, the blood in the first space 103 flows along the surface of the second guiding portion 1321 in the second direction through the surface of the column portion 1322, and more heat generated by the operation of the body 132 can be taken away by the flowing blood.

It is noted that the auxiliary structure may include at least one of the guide passage 124, the auxiliary impeller 140, the first guide portion 125, and the second guide portion 1321. As an example, as shown in fig. 22 and 23, the auxiliary structure may include a guide passage 124 and an auxiliary impeller 140. The direction of the arrows in the figure is to indicate the direction of blood flow.

The blood pump in the embodiments of the present application includes: a housing 110 having an accommodation chamber; an outlet 101 provided at one side of the housing 110; an impeller 120 rotatably disposed in the accommodating chamber; a driving device including a body 132 and a driving shaft 131; the driving shaft 131 is rotatably disposed on the body 132, and the driving shaft 131 is connected to the impeller 120; the driving device is used for driving the impeller 120 to rotate in the accommodating cavity through the driving shaft 131; an auxiliary structure provided to the impeller 120 and/or the driving device for flowing blood in the first space 103; the first space 103 is a space formed between the impeller 120 and the body 132; the impeller 120 is used for pushing blood to flow out from the outlet 101 in a first direction under the condition that the driving shaft 131 drives the impeller 120 to rotate, and the auxiliary structure is used for enabling the blood in the first space 103 to flow in a second direction; the auxiliary structure enables the blood in the first space 103 to flow in the second direction, so that coagulation in the first space 103 can be prevented, and the safety of the blood pump in use is improved.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A blood pump capable of preventing coagulation, comprising:

a housing having an accommodating chamber;

an outlet disposed at one end of the housing;

the impeller is rotatably arranged in the accommodating cavity;

2. The blood pump of claim 1, wherein the impeller comprises:

the auxiliary structure includes:

3. The blood pump of claim 2, wherein the cross-sectional shape of the flow-directing channel is circular or bar-shaped;

4. The blood pump of claim 2, wherein the flow guide channel is disposed at an angle, and the flow guide channel is inclined in a direction matching a third direction, wherein the third direction is a direction in which blood flows out of the outlet in a radial direction of the housing.

5. The blood pump of claim 1, wherein the auxiliary structure comprises:

an auxiliary impeller rotatably disposed in the first space;

6. The blood pump of claim 5, wherein the auxiliary impeller contacts an outer surface of the impeller or forms a first gap; the outer surface of the impeller is the surface facing the body.

7. The blood pump of claim 1, wherein the impeller comprises:

the auxiliary structure includes:

when the driving shaft drives the impeller to rotate, the impeller is used for pushing the blood in the accommodating cavity to flow out of the outlet in a first direction, and the blood in the first space flows to the outlet along the first guide part in a second direction.

8. The blood pump of claim 7, wherein the first guide is frustoconical.

9. The blood pump of any one of claims 1-8, wherein the auxiliary structure comprises:

10. The blood pump of claim 9, wherein the body further comprises:

a columnar portion connected to the second guide portion;