JP7426503B2 - blood pump - Google Patents

Description

(Cross reference to related applications)
This application is filed based on a Chinese patent application with application number 202110661223.2 dated June 15, 2021, and claims priority to the Chinese patent application, and all contents of the Chinese patent application are incorporated herein by reference. Incorporated.

Blood pumps are generally used to promote the normal flow of blood of a medical subject during surgery, for example, by pumping blood within the ventricles of the heart into the arteries of the medical subject through the operation of the blood pump. Thereby, the normal blood circulation of the medical subject can be guaranteed, and the blood of the medical subject can be normally circulated when performing heart-related surgery on the medical subject.

Currently, blood pumps are mainly axial flow pumps, and a predetermined flow rate and pressure are supplied by rotating an impeller via a drive device. In related technologies, blood pumps have a high risk of causing problems such as thromboembolism and stroke, and the safety of using blood pumps is low.

In view of this, embodiments of the present application provide a blood pump.

Embodiments of the present application provide a blood pump, the blood pump comprising:
a housing having a receiving cavity;
an outlet located at one end of the housing;
an impeller, at least a portion of which is rotatably disposed within the receiving cavity, for forcing blood within the receiving cavity to flow out of the outlet;
A drive device for rotationally driving the impeller via the drive shaft, comprising a drive shaft connected to the impeller, and a main body on which the drive shaft is rotatably arranged;
an auxiliary structure disposed on the impeller and/or the drive device for causing blood to flow in a first space, which is a space located outside the accommodation cavity and formed between the impeller and the main body; , is provided.

In some optional embodiments, the impeller is:
a base portion located external to the receiving cavity and forming the outlet with the first end of the housing;
The auxiliary structure is
A diversion flow path is disposed in the base portion and communicates with the accommodation cavity and the first space, respectively, for conducting the blood in the accommodation cavity and the blood in the first space.

In some optional embodiments, the cross-sectional shape of the diversion channel is circular or linear, and/or
The auxiliary structure includes at least two annularly or radially arranged diversion channels.

In some optional embodiments, the diversion channel is arranged to be inclined, and a first axis is formed between a first port of the diversion channel and the outlet, and the first axis is parallel to the axis of the diversion channel, where a first port of the diversion channel is a port of the diversion channel located on the side of the accommodation cavity.

In some optional embodiments, the diversion channel communicates an outer surface of the base portion with an inner surface of the base portion, the outer surface of the base portion being the surface facing the body, and the outer surface of the base portion being the surface facing the body; The inner surface is the surface facing the receiving cavity.

In some optional embodiments, the diversion channel is close to a connection point between the base portion and the drive shaft, and the hole diameter of the diversion channel is smaller than a second predetermined value.

In some optional embodiments, the auxiliary structure is:
A stirring mechanism is provided, which is rotatably disposed in the first space and pushes out blood in the first space so as to flow.

In some optional embodiments, the stirring mechanism comprises a protruding structure disposed on the impeller and/or drive shaft, and/or
The stirring mechanism includes a concave structure disposed on the impeller and/or the drive shaft.

In some optional embodiments, the stirring mechanism comprises:
An auxiliary impeller rotatably arranged in the first space is provided.

In some optional embodiments, the stirring mechanism is in contact with or forms a first gap between an outer surface of the impeller, and the outer surface of the impeller is a surface facing the body. It is.

In some optional embodiments, the stirring mechanism comprises:
At least two protrusions are arranged on the outer surface of the impeller and have a spiral plate shape for imparting an axial flow velocity to the blood in the first space.

In some optional embodiments, a root portion of the protrusion contacts or connects to the drive shaft, and an end of the protrusion is flush with an edge of the impeller.

In some optional embodiments, the impeller is:
a base portion located external to the receiving cavity and forming the outlet with the first end of the housing;
The auxiliary structure is
A first spacer disposed on the outer surface of the base part, the cross-sectional area of which becomes smaller as the distance from the outlet side increases, for causing the blood in the first space to flow along the surface of the first guide part to the outlet. A guide section is provided.

In some optional embodiments, the width between the base portion and the body gradually increases from a middle portion of the base portion to an edge of the impeller.

In some optional embodiments, the first guide portion is frustoconical.

In some optional embodiments, the auxiliary structure is:
Disposed at the first end of the main body, the cross-sectional area of which increases as the distance from the outlet side increases, for causing the blood in the first space to flow along the surface of the main body through the surface of the second guide part. A second guide portion.

In some optional embodiments, the impeller causes blood within the receiving cavity to flow from a first end of the blood pump to a second end of the blood pump, and the auxiliary structure is configured to flow blood within the receiving cavity from a first end of the blood pump to a second end of the blood pump. Blood is caused to flow from the second end of the blood pump to the first end of the blood pump.

The blood pump in an embodiment of the present application includes a housing having a housing cavity, an outlet disposed at one end side of the housing, and at least a portion of which is rotatably disposed within the housing cavity, and a blood pump in the housing cavity. an impeller for pushing out the liquid so as to flow out from the outlet, a drive shaft connected to the impeller, and a main body in which the drive shaft is rotatably arranged, and the impeller is rotationally driven via the drive shaft. a drive device disposed on the impeller and/or the drive device for flowing blood in a first space, which is a space located outside the accommodation cavity and formed between the impeller and the main body; an auxiliary structure for causing the blood to flow in the first space to increase the flow rate of the blood in the first space, and to reduce the risk of blood coagulating in the first space. can be reduced to improve the safety of blood pump use.

1 is an optional structural diagram of a conventional blood pump; FIG. 1 is a structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG. 1 is a partial structural schematic diagram of an optional embodiment of a blood pump provided by embodiments of the present application; FIG.

101: Outlet, 102: Inlet, 103: First space, 110: Housing, 112: Opening, 120: Impeller, 121: Connection section, 122: Blade, 123: Base section, 124: Diversion channel, 125: No. 1 guide part, 131: drive shaft, 132: main body, 1321: second guide part, 1322: columnar part, 140: stirring mechanism.

The specific technical features of each embodiment described in the specific embodiments can be combined in various ways as long as they do not contradict each other. For example, different embodiments can be created by combining different specific technical features. In order to avoid unnecessary duplication, various possible combinations of specific technical features in the present application will not be described again.

In the description of the embodiments of the present application, unless otherwise specified or limited, the term "connection" should be understood in a broad sense, such as electrical connection or internal communication between two parts. It may be directly connected or indirectly connected through an intermediary, and those skilled in the art may understand the specific meaning of the above terms depending on the specific situation. I can do it.

Note that the terms "first/second/third" in the embodiments of this application are used only to distinguish between similar objects, and do not represent a specific order of the objects. It is understood that the specific order or forward/backward order of "second/third" may be interchanged if permitted. The distinctions made by "first/second/third" refer to the appropriate terms such that the embodiments of the present application described herein may be practiced in an order other than that illustrated or described herein. It is understood that they can be interchanged in some cases.

The blood pump includes a housing 110, an outlet 101, an impeller 120, a drive, and auxiliary structures. The housing 110 has a receiving cavity, the outlet 101 is disposed at one end of the housing 110, and an impeller 120 is rotatably disposed at least partially within the receiving cavity. The drive device is used to force blood to flow out of the outlet 101, and the drive device includes a main body 132 and a drive shaft 131, the drive shaft 131 is rotatably disposed in the main body 132, and the drive device A shaft 131 is connected to the impeller 120, the drive device is used to rotationally drive the impeller 120 via the drive shaft 131, and an auxiliary structure is arranged on the impeller 120 and/or the drive device. , the auxiliary structure is used to flow blood in a first space 103, and the first space 103 is a space formed between the impeller 120 and the main body 132, and the first space 103 is a space formed between the impeller 120 and the main body 132. 103 is located outside the accommodation cavity, and when the drive shaft 131 rotationally drives the impeller 120, the impeller 120 pushes the blood out of the outlet 101, and the auxiliary structure Blood within one space 103 is made to flow. The auxiliary structure also allows the blood in the first space 103 to flow to increase the flow rate of the blood in the first space 103, thereby reducing the risk of blood clotting in the first space 103. , can improve the safety of blood pump use.

In embodiments of the present application, the blood pump is an interventional blood pump, in which, in operation, the blood pump is generally disposed inside a living body, blood flows in and out of a containing cavity, and the blood pump has an outlet. The first space 103 is located outside the receiving cavity, and the first space 103 is located inside the living body, where the blood flowing from the outside of the receiving cavity has a predetermined pressure. Since the flow rate of blood is low, blood clots easily occur, which affects the safety of living organisms.

In the embodiment of the present application, as shown in FIG. 1, if there is no auxiliary structure, when the drive shaft 131 rotationally drives the impeller 120, the flow rate of blood in the first space 103 is low and the blood pump is When operating for a long time, blood clots are likely to occur on the drive shaft 131, changing the blood flow state and inhibiting the normal operation of the blood pump, reducing the flow rate of the blood pump, and when the volume of thrombus caused by blood clots is large. The blood pump will further malfunction, causing problems such as thromboembolism and stroke, which will affect the patient's life safety.

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

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

Here, the housing 110 may have an opening 112 that is connected to the receiving cavity such that at least a portion of the impeller 120 is rotatably disposed inside the receiving cavity through the opening 112. communicate.

Here, the housing 110 may further include an inlet 102 that communicates with the receiving cavity such that blood can enter from the inlet 102 into the receiving cavity.

In embodiments of the present application, the outlet 101 is located at one end of the housing 110, and the outlet 101 may be located in the housing 110 or external to the housing 110. For example, as shown in FIG. 2, the impeller 120 may include a base part 123 located outside the receiving cavity, the base part 123 forming the outlet 101 together with the first end of the housing 110. . Here, the structure of the base portion 123 is not limited. For example, the base portion 123 may have a frustoconical structure so as to be able to provide a guiding effect to the blood within the receiving cavity.

In the embodiment of the present application, the structure of the impeller 120 is not limited as long as the impeller 120 can push out the blood in the receiving cavity through rotation so as to flow out from the outlet 101.

For example, as shown in FIG. 3, the impeller 120 includes a connecting portion 121, a blade 122, and a base portion 123. The blade 122 is fixed to the outer side of the connecting part 121 , and the base part 123 is arranged at the second end of the connecting part 121 so as to form the outlet 101 with the first end of the housing 110 . is connected to a drive shaft 131, and the drive shaft 131 is located outside the receiving cavity.

In this embodiment, the structure of the connecting portion 121 is not limited. For example, the connecting portion 121 may have a columnar structure. Further, for example, the connecting portion 121 may include a first end and a second end. The first end of the connecting portion 121 has a tapered structure, and the first end of the connecting portion 121 is on the side of the inlet 102 to provide a guiding effect to the blood through the first end of the connecting portion 121. approach. The second end of the connecting portion 121 has a columnar structure. A portion between the first end of the connecting portion 121 and the second end of the connecting portion 121 has a columnar structure such that a portion between the first end and the second end connects with the blade 122.

In this embodiment, the structure of the blade 122 is not limited. For example, the blade 122 may have a flat plate-like structure or a bent plate-like structure. The blades 122 may be equal height blades 122 or may be unequal height blades 122. Illustratively, the height of the blade 122 gradually increases from the leading edge of the blade 122 to the trailing edge of the blade 122, where the leading edge of the blade 122 is one end approaching the inlet 102 and the trailing edge of the blade 122. is one end on the side approaching the outlet 101.

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

By way of example, the impeller 120 may further include at least one blade 122 fixed on the circumferential side of the connection part 121 and used to push out the blood flow, and the drive shaft 131 may be connected to the impeller. When driving 120 in rotation, the blade 122 is used to force blood to flow from the first end of the connection part 121 to the second end of the connection part 121.

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

Here, the structure of the main body 132 is not limited. For example, the main body 132 may have a columnar structure. By way of example, body 132 may be the body 132 of a motor, and drive shaft 131 may be the output shaft of the motor.

Here, the manner in which the drive shaft 131 and the impeller 120 are connected is not limited. For example, the impeller 120 and the drive shaft 131 may be connected via a spline key or a flat key. Further, for example, the impeller 120 and the drive shaft 131 may be connected via welding means.

Here, the drive device is connected to the impeller 120 via a drive shaft 131 such that the impeller 120 is rotatably disposed within the receiving cavity.

In the embodiments 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 rate of blood in the first space 103. For example, when the auxiliary structure is not placed, the flow rate of blood in the first space 103 is V1, and when the auxiliary structure is placed, the flow rate of blood in the first space 103 is V2, and the auxiliary structure is , is used to flow the blood in the first space 103, in this case V2 is larger than V1, thereby reducing the risk of blood clotting in the first space 103 and reducing the use of the blood pump. safety can be improved.

Here, the numerical value of the flow rate of blood in the first space 103 is not limited.

For example, the auxiliary structure is used to increase the flow rate of blood in the first space 103 to be greater than a first predetermined value.

Here, the first predetermined value may be a flow rate at which blood in the first space does not coagulate. The first predetermined value is not limited. For example, the first predetermined value may be 0.5 m/s or more. As an example, the first predetermined value is 1 m/s or 2 m/s.

Here, the auxiliary structure may be arranged on the impeller 120, the drive device, or both the impeller 120 and the drive device.

In the embodiment of the present application, the impeller 120 is used to force blood to flow out of the outlet 101, and the auxiliary structure is used to flow the blood in the first space 103, and the auxiliary structure is used to force blood to flow out of the outlet 101. The flow rate of blood in the first space 103 can be increased to reduce the risk of blood clotting in the first space 103 and improve the safety of using the blood pump.

Here, the first space 103 is a space formed between the impeller 120 and the main body 132, and includes the maximum cross section of the impeller 120 on the side approaching the main body 132 and the side of the main body 132 approaching the impeller 120. As shown in FIGS. 11 and 20, the first space 103 is surrounded by the outer surface of the impeller 120, the outer surface of the main body 132, and a broken line.

In some optional embodiments of examples of the present application, the auxiliary structure may include a diversion channel 124, the diversion channel 124 being disposed in the base portion 123; are in communication with the accommodation cavity and the first space 103, respectively, and are used to establish an electrical connection between the blood in the accommodation cavity and the blood in the first space 103, and cause the blood in the first space 103 to flow. . Thereby, the diversion channel 124 increases the flow rate of blood in the first space 103, reduces the risk of blood coagulating in the first space 103, and improves the safety of using the blood pump. be able to.

In this embodiment, the flow direction of blood within the first space 103 is not limited.

For example, as shown in FIG. 2, when the drive shaft 131 rotationally drives the impeller 120, the blood in the first space 103 flows into the accommodation cavity from the diversion flow path 124, and The impeller 120 pushes the blood that has entered the accommodation cavity out of the outlet 101, thereby causing the blood in the first space 103 to flow through the diversion channel 124. The blood flow rate can be increased to reduce the risk of blood clotting in the first space 103 and improve the safety of use of the blood pump.

In this embodiment, no separate structure for pushing out the flow of blood is disposed within the first space 103.

In this embodiment, when the drive shaft 131 rotationally drives the impeller 120, a large negative pressure is generated near the outlet 101 of the accommodation cavity, and the pressure in the first space 103 is applied to the outlet 101 of the accommodation cavity. Being greater than the pressure at the point of approach, the blood in the first space 103 flows into the receiving cavity via the diversion channel 124 and is diverted diagonally along the base portion 123 by the thrust of the impeller 120. By allowing the blood to flow out from the outlet 101, the blood flow rate near the drive shaft 131 is thus significantly increased, which can effectively reduce the occurrence of blood clots.

In this embodiment, the impeller 120 directs the blood in the receiving cavity from the first end of the blood pump to the second end of the blood pump, and the auxiliary structure directs the blood in the first space 103 to Flowing from the second end of the blood pump to the first end of the blood pump, the blood in the two spaces will eventually flow out of the outlet 101 in substantially opposite directions.

For example, when the drive shaft 131 rotationally drives the impeller 120, the blood in the accommodation cavity flows into the first space 103 from the diversion flow path 124, and the impeller 120 rotates in the accommodation cavity. The impeller 120 pushes out a portion of the blood in the accommodation cavity to flow out from the outlet 101, and the impeller 120 forces another portion of the blood in the accommodation cavity to flow out from the first space 103 through the diversion channel 124. extrusion, thereby causing blood in the first space 103 to flow through the diversion channel 124, increasing the flow rate of the blood in the first space 103, and reducing the risk of blood clotting in the first space 103. can be reduced to improve the safety of blood pump use.

In this embodiment, another means for pushing out the flow of blood is arranged within the first space 103.

In this embodiment, the drive shaft 131 rotates the impeller 120, and when the means for pushing out the flow of blood in the first space 103 is operated, the pressure in the first space 103 is reduced to the outlet 101 of the receiving cavity. The blood in the receiving cavity enters the first space 103 via the diversion channel 124 and flows by the extrusion of the means for expelling the blood flow, thus , the blood flow velocity near the drive shaft 131 is significantly increased, and the occurrence of blood clots can be effectively reduced.

In this embodiment, the structure of the means for pushing out the flow of blood is not limited. For example, the structure of the means for pushing out the flow of blood may be an agitation mechanism 140.

In this embodiment, the cross-sectional shape of the diversion channel 124 is not limited. For example, the cross-sectional shape of the diversion channel 124 may be circular, linear, rectangular, or triangular.

In this embodiment, the hole diameter of the diversion channel 124 is not limited. For example, the hole diameter of the diversion channel 124 is less than or equal to the second predetermined value. As an example, the second predetermined value may be 1 mm.

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

By way of example, the auxiliary structure may include at least two diversion channels 124 arranged in an annular manner. The at least two diversion channels 124 may be arranged radially. When the at least two diversion channels 124 are arranged in a ring, the at least two diversion channels 124 may be arranged in a circle, as shown in FIGS. 3 and 4. As shown in FIGS. 5 and 6, the at least two diversion channels 124 may be arranged around two circumferences. When the at least two diversion channels 124 are arranged radially, the at least two diversion channels 124 are arranged in four linear diversion channels arranged radially, as shown in FIGS. 7 and 8. A flow path 124 may also be provided.

In this embodiment, as shown in FIGS. 9 and 10, the diversion channel 124 may be arranged to be inclined, and the direction of inclination of the diversion channel 124 is not limited. For example, a first axis is formed between a first port of the diversion channel 124 and the outlet 101, the first axis is parallel to the axis of the diversion channel 124, and the first axis is parallel to the axis of the diversion channel 124, and the first axis is parallel to the axis of the diversion channel 124. The first port of the version flow path 124 is the port of the diversion flow path 124 located on the side of the receiving cavity, and thus the blood in the first space 103 can be more easily transferred to the diversion flow path 124. The liquid flows into the accommodation cavity through the outlet 101 and directly flows out from the outlet 101. Here, parallel means parallel or substantially parallel, and the axis of the diversion flow path 124 is the same as the guide direction of the diversion flow path 124. Of course, the diversion channel 124 may be arranged so as not to be inclined, and the guide direction of the diversion channel 124 may be arranged perpendicular to the outer surface of the base portion 123.

In this embodiment, the position of the diversion channel 124 in the base portion 123 is not limited. The diversion flow path may communicate between an outer surface of the base portion and an inner surface of the base portion, the outer surface of the base portion being a surface facing the main body, and the inner surface of the base portion communicating with the accommodation cavity. It is a surface facing toward .

For example, the diversion flow path may be arranged only inside the base part and not inside other structures, and when the base part and the drive shaft are connected, the diversion flow path It is not arranged on the shaft, and the diversion flow path is not arranged at the boundary position between the drive shaft and the base part.

By way of example, the diversion channel 124 may be located on the edge side of the base portion 123, as shown in FIG.

As another example, the diversion channel 124 may be located in the middle of the base portion 123.

As another example, as shown in FIGS. 24 and 25, the diversion flow path 124 is such that the blood flowing through the diversion flow path 124 directly flows on the outer surface of the drive shaft 131 in the first space. In order to be able to wash away the outer surface of the drive shaft 131 inside, the connection point between the base portion 123 and the drive shaft 131 is approached, and the connection point between the drive shaft 131 and the base portion 123 is in the diversion flow path 124. placed adjacent to. This greatly reduces the possibility of blood clotting on the outer surface of the drive shaft 131.

In some optional embodiments of the examples of the present application, as shown in FIG. is used to push out the flow of blood in the first space 103, and the stirring mechanism 140 increases the flow rate of the blood in the first space 103 to reduce the risk of blood coagulating in the first space 103. can be reduced to improve the safety of blood pump use.

In this embodiment, a stirring mechanism 140 is arranged in the first space 103. When the drive shaft 131 rotationally drives the impeller 120, the stirring mechanism 140 rotates in the first space, the impeller 120 functions as a pump to pump blood, and the rotation of the stirring mechanism 140 is caused by the rotation of the drive shaft 131. To increase the flow of blood in the vicinity and further reduce the risk of blood coagulating in the vicinity of the drive shaft 131, while at the same time further improving the blood feeding efficiency of the blood pump by rotating the stirring mechanism 140. I can do it.

In this implementation, the direction in which stirring mechanism 140 rotates may be the same as the direction in which impeller 120 rotates.

In this embodiment, the position where stirring mechanism 140 is arranged is not limited. For example, stirring mechanism 140 may be disposed on impeller 120 , and by way of example, stirring mechanism 140 is disposed on base portion 123 of impeller 120 . Further, for example, the stirring mechanism 140 may be arranged on the drive shaft 131. Further, for example, the stirring mechanism 140 is disposed on both the impeller 120 and the drive shaft 131.

In this embodiment, the structure of stirring mechanism 140 is not limited. For example, the stirring mechanism 140 may include a protruding structure or a recessed structure disposed on the impeller 120. Further, for example, the stirring mechanism 140 may include a protrusion structure or a recess structure disposed on the drive shaft 131.

As an example, the stirring mechanism 140 may include an auxiliary impeller. The auxiliary impeller is rotatably arranged in the first space 103. When the drive shaft 131 rotationally drives the impeller 120, the impeller 120 pushes the blood in the accommodation cavity out of the outlet 101, and the auxiliary impeller pushes out the blood in the first space 103. Push out the flow. This can increase the flow rate of blood in the first space 103, reduce the risk of blood coagulating in the first space 103, and improve the safety of using the blood pump.

In the first example, the structure of the auxiliary impeller is not limited.

For example, the auxiliary impeller may be an axial impeller, an aft centrifugal impeller, or a forward centrifugal impeller. When the auxiliary impeller is an axial impeller, the shape of the auxiliary impeller may be a forward curved type, a radial type, a single plate type, an airfoil type, or the like. When the auxiliary impeller is a rear centrifugal impeller, the shape of the auxiliary impeller may be a single plate type, a circular arc type, an airfoil type, or the like. When the auxiliary impeller is a forward centrifugal impeller, the shape of the auxiliary impeller may be a flat blade, a narrow arc blade, a circular arc blade, an airfoil blade, a flat curved backward blade, or the like.

By way of example, the auxiliary impeller may include auxiliary blades, by which the flow of blood within the first space 103 can be forced out.

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

Here, the shape of the auxiliary blade is not limited. For example, the auxiliary blade may have a straight plate-like structure. Further, for example, as shown in FIGS. 13, 15, 17, and 19, the auxiliary blade may have a curved plate-like structure.

In the first example, the form in which the auxiliary impeller is rotatably arranged in the first space 103 is not limited. For example, the auxiliary impeller may be fixed to the drive shaft 131 to be driven to rotate via the drive shaft 131. Also, for example, the auxiliary impeller may be fixed to the impeller 120 in order to be driven to rotate through the impeller 120.

In this implementation, the distance between the stirring mechanism 140 and the impeller 120 is not limited.

For example, the stirring mechanism 140 is in contact with the outer surface of the impeller 120, and as shown in FIGS. It is the surface.

For example, a first gap is formed between the stirring mechanism 140 and the outer surface of the impeller 120, and as shown in FIGS. 16 and 18, in the process of the stirring mechanism 140 pushing out the flow of blood, The blood in the first gap flows along the axial direction of the rotation of the stirring mechanism 140, and the blood in the first space 103 flows outside the first space and also flows along the axial direction of the rotation of the stirring mechanism 140. This can further reduce the risk of blood coagulating in the first space 103 and improve the safety of using the blood pump.

12 and 13 are views of the same structure, and FIG. 13 is a bottom view of FIG. 12. 14 and 15 are views of the same structure, and FIG. 15 is a bottom view of FIG. 14. 16 and 17 are views of the same structure, and FIG. 17 is a bottom view of FIG. 16. 18 and 19 are views of the same structure, and FIG. 19 is a bottom view of FIG. 18.

As a second example, the stirring mechanism 140 may include at least two protrusions disposed on the outer surface of the impeller 120, and the stirring mechanism 140 may include at least two protrusions disposed on the outer surface of the impeller 120. For blood flow, the outer surface of the impeller 120 is the surface facing the body 132.

In example 2, when the impeller 120 includes a base part 123, at least two protrusions are symmetrically arranged on the outer surface of the base part 123.

In the second example, the shape of the protrusion is not limited.

For example, as shown in FIG. 26, the protrusions are linear structures and at least two protrusions are radial, where the protrusions form a centrifugal stirring mechanism 140.

Further, for example, as shown in FIGS. 27, 28, and 29, the protrusion may have a spiral plate shape, and the protrusion allows the blood in the first space 103 to have an axial flow velocity. The protrusions form an axial stirring mechanism 140, where the protrusions not only push the blood to flow along the axial direction of the drive shaft 131, but also It can also be centrifugally extruded so as to flow along the radial direction of the shaft 131. This allows blood to flow on the surface of the drive shaft 131 via the spiral plate-shaped protrusion, while also allowing blood in the first space 103 to flow out from the first space 103. In this way, the risk of blood coagulating on the surface of the drive shaft 131 can be reduced, while the blood pumping efficiency of the blood pump can be improved.

Note that FIGS. 27, 28, and 29 are views of the same structure from different viewpoints.

In the second example, the number of protrusions is not limited. For example, as shown in FIG. 26, the number of protrusions is four. Further, for example, as shown in FIGS. 27, 28, and 29, the number of protrusions is two.

In the second example, the position of the base of the protrusion is not limited. For example, as shown in FIGS. 26 and 29, the base of the protrusion contacts or connects with the drive shaft 131 to prevent blood from coagulating between the base of the protrusion and the drive shaft 131. Of course, a gap may be formed between the root of the protrusion and the drive shaft 131.

In the second example, the position of the end of the protrusion is not limited. For example, the ends of the protrusions are flush with the edges of the impeller 120 to increase the disposed volume of the protrusions and improve the blood flow extrusion efficiency of the protrusions. Of course, the end of the protrusion may be located between the edge of the impeller 120 and the middle part of the impeller 120.

The root of the protrusion is one end of the protrusion that approaches the middle part of the impeller 120, and the end of the protrusion is one end of the protrusion that is away from the middle part of the impeller 120.

In some optional implementations of the embodiments of the present application, as shown in FIGS. 20 and 21, the auxiliary structure may include a first guide portion 125 disposed on the outer surface of the base portion 123; The cross-sectional area of the first guide part 125 decreases as it moves away from the outlet 101, and the first guide part 125 directs blood in the first space toward the outlet 101 along the surface of the first guide part 125. When the drive shaft 131 rotates the impeller 120 , the impeller 120 pushes the blood in the accommodation cavity to flow out of the outlet 101 and the blood in the first space 103 . The blood flows along the surface of the first guide part 125 to the outlet 101, causing the blood in the first space 103 to flow through the first guide part 125, so that the blood in the first space 103 and the blood in the first space 103 flow together. The blood at outlet 101 is collected in one place and forced out in flow through impeller 120. This can increase the flow rate of blood in the first space 103, reduce the risk of blood coagulating in the first space 103, and improve the safety of using the blood pump.

In this embodiment, when the drive shaft 131 rotationally drives the impeller 120, the first guide part 125 also rotates accordingly, and the cross-sectional area of the first guide part 125 decreases as it moves away from the outlet 101. Therefore, a centrifugal force was generated in the first guide part 125, and the flow velocity of blood in the first space at the base part 123 was increased.

In this embodiment, the width between the base part 123 and the main body 132 gradually increases from the middle part of the base part 123 to the edge of the base part 123. By forming the first space as an open space in this manner, the flow rate of blood within the first space to the outside of the first space can be increased.

In this embodiment, the structure of the first guide part 125 is not limited as long as the cross-sectional area of the first guide part 125 decreases as the distance from the outlet 101 increases. For example, the first guide part 125 may have a truncated conical shape in order to cause blood to flow smoothly along the surface of the first guide part 125. Further, for example, the first guide portion 125 may have a truncated pyramid shape.

In this 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.

For example, the first guide part 125 has a circular cross section, and 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. increase For example, the outer surface of the first guide part 125 is a protruding surface. For example, the outer surface of the first guide part 125 is a concave surface. Further, for 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. The cross-sectional area of the guide part 1321 increases as it moves away from the outlet side, and the second guide part 1321 allows the blood in the first space to pass through the surface of the second guide part 1321 and follow the surface of the main body. When the drive shaft 131 rotationally drives the impeller 120, the impeller 120 pushes the blood in the accommodation cavity to flow out of the outlet 101 and the blood in the first space 103. The blood flows along the surface of the main body due to the guiding action of the surface of the second guide part 1321, and the flow velocity of the blood in the first space 103 is increased by the guiding action of the second guiding part 1321, The risk of blood coagulating in the first space 103 can be reduced and the safety of using the blood pump can be improved.

In this embodiment, the structure of the second guide part 1321 is not limited as long as the cross-sectional area of the second guide part 1321 increases as the distance from the exit side increases. For example, the second guide part 1321 may have a truncated conical shape in order to cause blood to flow smoothly along the surface of the second guide part 1321. Further, for example, the second guide portion 1321 may have a truncated pyramid shape.

In this 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.

For example, the second guide part 1321 has a circular cross section, and the outer diameter of the second guide part 1321 gradually increases from the first end of the second guide part 1321 to the second end of the second guide part 1321. increase For example, the outer surface of the second guide part 1321 is a protruding surface. For example, the outer surface of the second guide part 1321 is a concave surface. Further, for example, the outer surface of the second guide portion 1321 is a planar surface.

In this embodiment, as shown in FIG. 20, the main body 132 may further include a columnar part 1322 connected to the second guide part 1321, and when the drive shaft 131 rotationally drives the impeller 120, The blood in the first space 103 flows along the surface of the columnar part 1322 through the surface of the second guide part 1321, and more heat generated by the operation of the main body 132 can be taken away through the flow of blood. can.

Note that the auxiliary structure may include at least one of the diversion channel 124, the stirring mechanism 140, the first guide section 125, and the second guide section 1321. For example, as shown in FIG. 2, the auxiliary structure includes only the diversion channel 124. For example, as shown in FIGS. 12 and 14, the auxiliary structure includes only the stirring mechanism 140. For example, as shown in FIG. 21, the auxiliary structure includes only the first guide portion 125. Further, for example, the auxiliary structure includes only the second guide portion 1321. For example, as shown in FIGS. 22 and 23, the auxiliary structure includes a diversion channel 124 and a stirring mechanism 140. For example, as shown in FIG. 20, the auxiliary structure includes a first guide part 125 and a second guide part 1321. For example, as shown in FIG. 30, FIG. 31, and FIG. 32, the auxiliary structure includes a first guide portion 125 and a stirring mechanism 140; FIG. For example, as shown in FIG. 33, the auxiliary structure includes a first guide portion 125 and a diversion channel 124. For example, as shown in FIGS. 34, 35, and 36, the auxiliary structure includes a first guide portion 125, a diversion channel 124, and a stirring mechanism 140, and here, , FIG. 35, and FIG. 36 are views of the same structure from different viewpoints. For example, the auxiliary structure includes a first guide section 125, a second guide section 1321, a diversion channel 124, and a stirring mechanism 140.

Note that the auxiliary structure includes a first guide portion 125 and a stirring mechanism 140, and when the stirring mechanism 140 is a protrusion structure disposed on the impeller, the protrusion structure is as shown in FIGS. 32 and 36. It protrudes from the surface of the first guide part 125.

Note that the arrow direction in the figure is the flow direction of blood.

The blood pump in an embodiment of the present application includes a housing 110 having a receiving cavity, an outlet 101 disposed at one end of the housing 110, and an outlet 101 at least partially rotatably disposed within the receiving cavity. The drive shaft includes an impeller 120 used to push blood out of the outlet, a drive shaft 131 connected to the impeller 120, and a main body 132 on which the drive shaft 131 is rotatably arranged. a drive device used to rotationally drive the impeller 120 via 131; and an auxiliary structure used to flow blood in the first space 103, which is a space formed between the drive shaft 131 and the impeller 120. , the auxiliary structure causes the blood in the first space 103 to flow to increase the flow rate of the blood in the first space 103 through the auxiliary structure, and the auxiliary structure The risk of coagulation within the first space 103 can be reduced, and the safety of using the blood pump can be improved.

As mentioned above, although the above is only a specific embodiment of the embodiment of the present application, the protection scope of the embodiment of the present application is not limited thereto, and a person skilled in the art can easily understand it within the technical scope disclosed in the embodiment of the present application. All possible changes or substitutions should be included within the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should comply with the protection scope of the claims.

Claims (15)

A blood pump,
a housing having a receiving cavity;
an outlet located at one end of the housing;
an impeller at least partially rotatably disposed within the receiving cavity for forcing blood within the receiving cavity to flow out of the outlet;
A drive device for rotationally driving the impeller via the drive shaft, comprising a drive shaft connected to the impeller, and a main body on which the drive shaft is rotatably arranged;
an auxiliary structure disposed on the impeller and/or the drive device for causing blood to flow in a first space, which is a space located outside the accommodation cavity and formed between the impeller and the main body; , comprising ;
The impeller is
a base portion located external to the receiving cavity and forming the outlet with the first end of the housing;
The auxiliary structure is
The first tube is disposed on the outer surface of the base part, has a cross-sectional area that becomes smaller as the distance from the outlet side increases, and is configured to cause the blood in the first space to flow along the surface of the first guide part to the outlet. 1 guide part;
Disposed at the first end of the main body, the cross-sectional area of which increases as the distance from the outlet side increases, for causing the blood in the first space to flow along the surface of the main body through the surface of the second guide part. and the second guide portion . The auxiliary structure is
A diversion flow path is disposed in the base portion and communicates with the accommodation cavity and the first space, respectively, for conducting the blood in the accommodation cavity and the blood in the first space.
The blood pump according to claim 1. The cross-sectional shape of the diversion flow path is circular or linear, and/or
The auxiliary structure comprises at least two annularly or radially arranged diversion channels.
The blood pump according to claim 2. The diversion channel is arranged to be inclined, and a first axis is formed between a first port and the outlet of the diversion channel, and the first axis is an axis of the diversion channel. , wherein the first port of the diversion flow path is a port of the diversion flow path located on the side of the accommodation cavity;
The blood pump according to claim 2. The diversion flow path communicates an outer surface of the base portion with an inner surface of the base portion, the outer surface of the base portion being a surface facing the main body, and the inner surface of the base portion being a surface facing the accommodation cavity. is,
The blood pump according to claim 2. The diversion flow path is close to a connection point between the base portion and the drive shaft, and the hole diameter of the diversion flow path is smaller than a second predetermined value.
Blood pump according to any one of claims 2 to 5. The auxiliary structure is
a stirring mechanism rotatably disposed in the first space and for pushing out blood in the first space so as to flow;
Blood pump according to any one of claims 1 to 6. The stirring mechanism includes a protrusion structure disposed on the impeller and/or the drive shaft, and/or
The stirring mechanism includes a concave structure disposed on the impeller and/or the drive shaft.
Blood pump according to claim 7. The stirring mechanism includes:
an auxiliary impeller rotatably arranged in the first space;
Blood pump according to claim 7. A first gap is formed between the stirring mechanism and an outer surface of the impeller, and the outer surface of the impeller is a surface facing the main body.
Blood pump according to claim 7. The stirring mechanism includes:
at least two protrusions disposed on the outer surface of the impeller, each having a spiral plate shape and providing an axial flow velocity to the blood in the first space;
Blood pump according to claim 7. The base of the protrusion contacts or connects to the drive shaft, and the end of the protrusion is flush with the edge of the impeller.
Blood pump according to claim 11. The width between the base part and the main body gradually increases from the middle part of the base part to the edge of the impeller.
The blood pump according to claim 1 . The first guide portion has a truncated conical shape.
The blood pump according to claim 1 . The impeller causes blood in the receiving cavity to flow from a first end of the blood pump to a second end of the blood pump, and the auxiliary structure causes blood in the first space to flow to a second end of the blood pump. to a first end of the blood pump;
Blood pump according to any one of claims 1 to 6.