WO2015097916A1

WO2015097916A1 - Blood pump and ventricular assist system

Info

Publication number: WO2015097916A1
Application number: PCT/JP2013/085279
Authority: WO
Inventors: 貴之宮越; 竜太鈴木
Original assignee: 株式会社サンメディカル技術研究所
Priority date: 2013-12-27
Filing date: 2013-12-27
Publication date: 2015-07-02
Also published as: JPWO2015097916A1

Abstract

A blood pump according to the present invention and equipped with a fixed-side sliding member having a ring-shaped first sliding surface, a rotating-side sliding member having a ring-shaped second sliding surface, a blood-pump chamber positioned on the outer-circumferential side of the fixed-side sliding member and the rotating-side sliding member, and a liquid-passage chamber positioned on the inner-circumferential side of the fixed-side sliding member and the rotating-side sliding member, the blood pump being used while causing a prescribed liquid to pass into the liquid passage chamber while the first and second sliding surfaces contact one another, and being characterized by being further equipped with an adhered-substance removal member (60) having: projections (62, 63) which approach the first sliding surface and/or the second sliding surface from the inner-circumferential side thereof; and a support base (64) for supporting the projections (62, 63). This blood pump makes it possible to minimize the sudden obstruction of the flow of a prescribed liquid.

Description

Blood pump and auxiliary artificial heart system

The present invention relates to a blood pump and an auxiliary artificial heart system.

Conventionally, an auxiliary artificial heart system that supplements a part of the function of the heart to maintain the life of the patient until the heart transplantation and a blood pump used in the auxiliary artificial heart system are known (for example, Patent Documents 1 and 2). reference.).

FIG. 8 is a cross-sectional view of a conventional blood pump 901.
FIG. 9 is a cross-sectional view for explaining the structure of a conventional blood pump 901. FIG. 9A is a cross-sectional view showing the main part of the blood pump 901, and FIG. 9B is a view schematically showing the structure near the first sliding surface 14 and the second sliding surface 24. In FIG. 9, the gap 52 is greatly illustrated.

The conventional blood pump 901 is a centrifugal pump that assists the function of the left ventricle of the heart. As shown in FIG. 8 and FIG. 9A, the blood pump 901 includes a fixed unit 10, a rotating unit 920, a rotation driving device 30, a blood pump chamber 32, and a liquid circulation path 40.

The fixed portion 10 includes a cylindrical fixed-side sliding member 12 (so-called seat ring).
As shown in FIG. 9B, the fixed-side sliding member 12 has an annular first sliding surface 14.

The rotation unit 920 includes a rotation side sliding member 922 (so-called seal ring), an impeller 926, and a transmission member 928. The rotating unit 920 can rotate clockwise as viewed from the impeller 926 side. Note that the reference symbol a indicates a rotation shaft of the rotation side sliding member 922. The rotation axis a coincides with the rotation axis of the entire rotation unit 920.
The rotation-side sliding member 922 has an annular second sliding surface 24.
The impeller 926 adds kinetic energy to the blood.
The transmission member 928 transmits a rotational force to the rotation side sliding member 922 by rotating at the time of use. The transmission member 928 is a rotating shaft. The transmission member 928 is given a rotational force by the rotation driving device 30 and rotates not only the rotation side sliding member 922 but also the entire rotation unit 920.

Rotational drive device 30 is a device that generates a rotational force. The rotary drive device 30 has, for example, a rotary motor.

In the blood pump 901, the fixed sliding member 12 and the rotating sliding member 922 function as mechanical seals when the first sliding surface 14 and the second sliding surface 24 face each other and come into contact with each other. .
The blood pump chamber 32 is located on the outer peripheral side of the fixed side sliding member 12 and the rotation side sliding member 922. Note that the reference symbol L2 represents blood.

The liquid circulation path 40 is a predetermined liquid L1 (for example, water or physiological saline. The predetermined liquid is referred to as a cool seal liquid or a purge liquid) that performs functions such as lubrication, cooling, and maintenance of sealing performance inside the blood pump 901. It is a route that circulates. The liquid circulation path 40 includes a liquid inlet 42, a liquid supply chamber 44, a liquid passage chamber 46, and a liquid outlet 48 as main components.

The fluid inlet 42 and fluid outlet 48 are connected to the circulatory device of the assistive heart system in use.
The liquid supply chamber 44 is located on the inner peripheral side of the transmission member 928.
The liquid passage chamber 46 is located on the inner peripheral side of the fixed side sliding member 12 and the rotation side sliding member 922. The blood pump 901 is used while allowing a predetermined liquid L1 to pass through the liquid passage chamber 46.

The predetermined liquid L1 first flows from the liquid inlet 42 and travels from the liquid supply chamber 44 to the liquid passage chamber 46. The predetermined liquid L1 is supplied to the gap 52 between the first sliding surface 14 and the second sliding surface 24 via the liquid passage chamber 46 as shown in FIG. And most of the liquid is discharged from the liquid outlet 44.
The predetermined liquid L <b> 1 has a function of performing lubrication between the first sliding surface 14 and the second sliding surface 24. The predetermined liquid L1 also has a function of cooling the stationary sliding member 12 and the rotating sliding member 922. Further, the predetermined liquid L1 has a function of suppressing the invasion of blood components from the gap 52 (ensuring sealing property) and a function of cleaning the first sliding surface 14 and the second sliding surface 24. The predetermined liquid L1 also has a function of performing lubrication between the transmission member 928 and the fixed portion 10 and a function of cooling the transmission member 928 and the fixed portion 10.

According to the conventional blood pump 901, since the blood pump is used while allowing the predetermined liquid L1 to pass through the liquid passage chamber 46, it can be used in a place where the operation stability is increased and a reliable operation is required. It becomes possible.

Japanese Patent Application No. 2012-289236 JP 2005-296528 A

However, even with the blood pump 901 as described above, it is possible that the blood L2 is leached into the gap 52 and a fixed substance made of plasma protein or the like enters the gap 52. It is conceivable that when the fixed matter enters the inner peripheral side of the first sliding surface 14 and the second sliding surface 24, a large lump is formed in the liquid passage chamber 46. Then, when a large lump of fixed matter is peeled from the inner peripheral side of the first sliding surface 14 and the second sliding surface 24, the lump is clogged with the filter, the liquid outlet 48, etc. of the circulation device, and the flow of the predetermined liquid L1 Is suddenly interrupted, and in the worst case, the function of the blood pump 901 may be impaired.

Of course, in the actual blood pump and the auxiliary artificial heart system, since many safety measures are taken, the above situation does not occur easily. According to the knowledge of the inventors of the present invention, the product-level blood pump and the auxiliary artificial heart system are impaired in function for the reasons described above, except for those experimentally tested under conditions that cause intentional failure. There is nothing that led to it.
However, considering that the application examples of blood pumps and assistive artificial heart systems will increase in the future, it is also necessary to study countermeasures for such situations.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a blood pump capable of suppressing a sudden flow of a predetermined liquid from being hindered. Another object of the present invention is to provide an auxiliary artificial heart system including the blood pump of the present invention.

The inventors of the present invention have conducted extensive research to achieve the above object, and as a result, in order to prevent the flow of a predetermined liquid from being interrupted suddenly, it is necessary to prevent the fixed matter from becoming a large lump. We came up with a good idea and completed the present invention. In other words, if the solid matter can be peeled from the inner peripheral side of each sliding surface while the lump of solid matter is small, the sticking matter can be prevented from clogging at one time, so that the flow of a predetermined liquid is prevented from being abruptly blocked. can do.
The contents of the present invention will be described below.

[1] The blood pump according to the present invention includes a stationary sliding member having an annular first sliding surface, a rotating sliding member having an annular second sliding surface, the stationary sliding member, and the A blood pump chamber located on the outer peripheral side of the rotating side sliding member; a liquid passage chamber located on the inner peripheral side of the stationary side sliding member and the rotating side sliding member; and the first sliding surface; A blood pump used in a state in which the second sliding surface is brought into contact with the second sliding surface while allowing a predetermined liquid to pass through the liquid passage chamber, wherein the first sliding surface and the second sliding surface are used. It further has a fixed object removing member having a protrusion that is close to at least one of the protrusions from the inner peripheral side and a support base that supports the protrusion.

When there is a protrusion as described above, the protrusion and the fixed object can be brought into contact with each other so that the fixed object can be peeled from the inner peripheral side of each sliding surface while the lump of the fixed object is small. Therefore, the blood pump according to the present invention includes the fixed object removing member having a protrusion that is adjacent to the inner peripheral side with respect to at least one of the first sliding surface and the second sliding surface. This is a blood pump that can prevent the flow of a predetermined liquid from being interrupted suddenly.

Further, according to the blood pump of the present invention, as in the case of the conventional blood pump, the blood pump is used while allowing a predetermined liquid to pass through the liquid passage chamber. It can be used where required.

As used herein, “adjacent” does not include touching.
“Use in a state in which the first sliding surface and the second sliding surface are in contact with each other and passing a predetermined liquid through the liquid passage chamber” means “when using the first sliding surface and In other words, “a state in which the second sliding surface is brought into contact with the liquid and the predetermined liquid is passed through the liquid passage chamber” can be used.

As the protrusion, various shapes such as a flat plate shape, a rod shape, a curved plate shape, a polygonal column shape, a columnar shape, a polygonal pyramid shape, a columnar shape, a spherical shape, a free-form surface shape, or a combination of these shapes, etc. What consists of shapes can be used.
The number of protrusions may be only one or a plurality.

[2] In the blood pump of the present invention, the shorter distance between the shortest distance between the protrusion and the fixed sliding member and the shortest distance between the protrusion and the rotating sliding member is 0.01 mm or more. It is preferable that

With such a configuration, it is possible to ensure safety even when an external force is applied to the blood pump by sufficiently separating the protrusion and each sliding member.
From the above viewpoint, the distance is more preferably 0.05 mm or more.

Note that the upper limit value of the distance varies depending on factors such as the size and structure of the blood pump, the flow rate of the predetermined liquid, the size of the flow path of the predetermined liquid, and cannot be determined unconditionally. In other words, the distance can be 1.00 mm or less.

[3] In the blood pump of the present invention, the blood pump further includes a rotation driving device that generates a rotational force, and a transmission member that transmits the rotational force to the rotation-side sliding member by rotating at the time of use. The fixed object removing member is preferably rotated together with the transmission member when used.

By the way, in the vicinity of the first sliding surface (fixed side sliding member) and in the vicinity of the second sliding surface (rotating side sliding member), there is a tendency that the fixed matter tends to adhere to the vicinity of the first sliding surface. . This is because the fixed-side sliding member does not rotate and therefore has a low resistance to a predetermined liquid. For this reason, by setting it as the above structures, it becomes possible to produce a speed difference between a protrusion and a 1st sliding surface, and to peel the adhering thing of the 1st sliding surface vicinity actively.

In the blood pump of the above [3], the adhering matter removing member is separate from the transmission member, and may be coupled to the transmission member when in use, or formed integrally with the transmission member. It may be non-separable (that is, the support base is a part of the transmission member). As a case where the fixed object removing member is separate from the transmission member, for example, as shown in an embodiment described later, a support base in the fixed object removing member may be coupled to the outer peripheral side of the transmission member. .
When the fixed matter removing member is separate from the transmission member, the blood pump can be easily assembled and maintained.

In the blood pump of [3] above, it is preferable that the protrusion is located across the plane including the first sliding surface. By setting it as such a structure, it becomes possible to peel many fixed things adhering to the 1st sliding surface vicinity.

[4] In the blood pump of the present invention, the fixed matter removing member has a plurality of protrusions as the protrusions, and each protrusion constituting the plurality of protrusions is centered on the rotation axis of the rotation-side sliding member. It is preferable that they are arranged at equal intervals on the circumference.

By adopting such a configuration, it is possible to evenly distribute the weight balance around the rotation axis and to stably rotate the fixed object removing member.

In addition, even when the shape of each protrusion which comprises a some protrusion differs, if the gravity center of each protrusion is arrange | positioned at equal intervals on the said circumference, it can be said that each protrusion is arrange | positioned at equal intervals.

[5] In the blood pump of the present invention, it is preferable that all the protrusions have the same shape.

By adopting such a configuration, the weight balance can be more evenly distributed around the rotation axis, and the fixed object removing member can be rotated more stably.

Whether or not each protrusion has the same shape is determined by rotating one of the protrusions around the rotation axis and aligning the position of one protrusion with the position of another protrusion. Judgment is made based on whether or not the shapes of the protrusions overlap each other. That is, in the case of [5] above, it can also be said that “the plurality of protrusions are arranged rotationally symmetrically about the rotation axis”.

[6] In the blood pump of the present invention, the protrusion is located on the outer peripheral side of the support base, and the support base has a cylindrical shape whose center axis coincides with the rotation axis of the rotation-side sliding member. The outer peripheral surface of the support base faces the liquid passage chamber, and the blood pump further includes a liquid supply chamber located on the inner peripheral side of the support base, and from the liquid supply chamber in use. It is preferable to supply the predetermined liquid to the liquid passage chamber.

With such a configuration, the liquid supply chamber is located on the inner peripheral side of the liquid passage chamber, and the path for supplying a predetermined liquid to the liquid passage chamber can be made compact.

In the case where the fixed matter removing member is separate from the transmission member, the liquid supply chamber can be located on the inner peripheral side of the transmission member (for example, the rotating shaft).
“The surface on the outer peripheral side of the support base faces the liquid passage chamber” means both that the whole surface faces the liquid passage chamber and that a part of the surface faces the liquid passage chamber. Including.

[7] In the blood pump of the present invention, it is preferable that the support base has an ejection hole for ejecting the predetermined liquid from the liquid supply chamber to the liquid passage chamber when in use.

By adopting such a configuration, it is possible to supply a predetermined liquid to the liquid passage chamber using a simple configuration.

In addition, depending on the position of the ejection hole, controlling the flow of the predetermined liquid in the liquid passage chamber can suppress the retention of the predetermined liquid and suppress the reattachment of the fixed matter near each sliding surface. It is also possible to obtain effects such as those described later.

In the blood pump of the present invention, the position, shape, number, etc. of the ejection holes can be set according to the shape of the protrusion and the structure of the blood pump in order to obtain the effects described in the upper part. [8] and [9] described below exemplify the positions of typical ejection holes.

[8] In the blood pump of the present invention, it is preferable that the support base has a first ejection hole at a position different from the projection in the axial direction or a position overlapping the projection as the ejection hole.

By adopting such a configuration, the first ejection hole can be arranged at a position that greatly affects the flow of the predetermined liquid in the vicinity of the protrusion, and the retention of the predetermined liquid in the vicinity of the protrusion can be suppressed. Become.

“Axial direction” refers to a direction along the rotation axis of the rotation-side sliding member.
“A position different from the protrusion in the axial direction” refers to a position that differs only in the axial direction (for example, in FIG. 4B described later, a position different from the protrusion in the vertical direction on the paper surface).

When the adhering matter removing member has a plurality of protrusions, the support base preferably has at least one first ejection hole per protrusion.

In the case where the support base in the fixed object removing member is coupled to the outer peripheral side of the transmission member and the liquid supply chamber is located on the inner peripheral side of the transmission member as in the embodiment described later, the transmission member Preferably has a hole corresponding to the first ejection hole.

[9] In the blood pump of the present invention, it is preferable that the support base has a second ejection hole as the ejection hole at a position different from the protrusion in the circumferential direction.

By adopting such a configuration, the second ejection holes are arranged in positions near the first sliding surface and in the vicinity of the second sliding surface that greatly affect the flow of the predetermined liquid, and the separated fixed matter is immediately removed. It is possible to suppress the fixed matter from reattaching to each part.

The “circumferential direction” refers to a direction along the circumference around the rotation axis of the rotation-side sliding member.
“A position different from the protrusion in the circumferential direction” refers to a position that differs only in the circumferential direction (for example, in FIG. 4B described later, a position different from the protrusion in the left-right direction on the paper surface).

In the case where the support base in the fixed object removing member is coupled to the outer peripheral side of the transmission member and the liquid supply chamber is located on the inner peripheral side of the transmission member as in the embodiment described later, the transmission member Preferably has a hole corresponding to the second ejection hole.

In the blood pump of the above [9], the second ejection hole is at a position upstream of a predetermined liquid flow with respect to the plane including the first sliding surface or a position including the plane when used. Is preferred.

[10] In the blood pump of the present invention, one of the directions parallel to the rotation axis of the rotation-side sliding member is a first direction, and a direction opposite to the first direction is a second direction. When one end of the ends when the protrusion is viewed in the circumferential direction is set as one end, and the end opposite to the one end is set as the other end, the protrusion is The one side end portion is located closer to the first direction than the other side end portion, and has a shape toward the second direction side as it approaches the other side end portion from the one side end portion. preferable.

By adopting such a configuration, it is possible to control the flow of a predetermined liquid by giving the protrusion a property like a rotary blade.

In addition, when the direction in which the predetermined liquid flows in the liquid passage chamber during use is viewed along a direction parallel to the axial direction, the flow direction as a whole (the direction in which most of the predetermined liquid flows. In the above [10], the first direction is the upstream side, and one end of the projection is the front side during rotation. In this case, it is possible to generate a force that causes the predetermined liquid to flow downstream, stabilize the flow of the predetermined liquid, and suppress the retention of the predetermined liquid in the downstream of the protrusion or the like.

Further, in the above [10], when the first direction is the upstream side and the other side end portion of the protrusion is the front side during rotation, a predetermined liquid flow different from the overall flow is created to pass the liquid. It is possible to feed the predetermined liquid to a portion where the flow rate of the predetermined liquid is small, such as the upstream end of the chamber, and promote the cleaning of the portion.

When the adhering matter removing member has a plurality of protrusions, one end and the other end can be determined for each protrusion (see FIG. 7).

In the blood pump of [10] above, the protrusion may have a substantially flat shape or may have a curved surface.

It should be noted that due to the influence of chamfering and the like and the thickness of the protrusion, the one side end may not be positioned closest to the first direction, and the other end may not be positioned closest to the second direction. Even in this case, when the protrusion as a whole has a shape toward the second direction as it approaches the other end, the structure described in the above [10] is satisfied (the embodiment and the later described). (See Modification 3).

[11] An auxiliary artificial heart system of the present invention includes the blood pump of the present invention and a circulator that circulates a predetermined liquid.

Since the auxiliary artificial heart system of the present invention includes the blood pump of the present invention, it is possible to suppress a sudden flow of a predetermined liquid from being interrupted, and the auxiliary artificial heart system has very high operational stability. Become.

It is a figure shown in order to demonstrate the auxiliary artificial heart system 100 which concerns on embodiment. It is sectional drawing of the blood pump 1 which concerns on embodiment. It is sectional drawing shown in order to demonstrate the structure of the blood pump 1 which concerns on embodiment. It is a figure of the adhering matter removal member 60 in an embodiment. It is a figure of the fixed thing removal member 70 in the modification 1. FIG. It is a figure of the fixed thing removal member 80 in the modification 2. FIG. It is a figure of the fixed thing removal member 90 in the modification 3. FIG. It is sectional drawing of the conventional blood pump 901. FIG. It is sectional drawing shown in order to demonstrate the structure of the conventional blood pump 901. FIG.

Hereinafter, embodiments of the blood pump and the auxiliary artificial heart system of the present invention will be described.

[Embodiment]
FIG. 1 is a diagram for explaining an auxiliary artificial heart system 100 according to an embodiment.
FIG. 2 is a cross-sectional view of the blood pump 1 according to the embodiment.
FIG. 3 is a cross-sectional view for explaining the structure of the blood pump 1 according to the embodiment. FIG. 3A is a cross-sectional view showing the main part of the blood pump 1, and FIG. 3B is a view schematically showing the structure near the first sliding surface 14 and the second sliding surface 24. In FIG. 3, the gap 52 is greatly illustrated. The arrow in the liquid passage chamber 46 in FIG. 3B indicates the flow direction (described later) as a whole.
FIG. 4 is a diagram of the fixed matter removing member 60 in the embodiment. 4 (a) is a perspective view, FIG. 4 (b) is a side view seen from the projection 62 side, FIG. 4 (c) is a top view, and FIG. 4 (d) is FIG. 4 (c). FIG. In addition, in FIG.4 (b), the processus | protrusion 63 located in a back surface is displayed with the broken line. Further, the AA cross section was set so that the first ejection holes 66 and the second ejection holes 68 in FIG.

As shown in FIG. 1, the auxiliary artificial heart system 100 according to the embodiment includes a blood pump 1 implanted in the body,

artificial blood vessels

120 and 130 for connecting the blood pump 1 and the blood flow of the heart, and not illustrated. A control device 150 and a circulation device 160 (not shown) are provided.

The control device 150 is used outside the body of the user of the auxiliary artificial heart system 100 and is connected to the blood pump 1 via the cable 140 when used.
The circulation device 160 is a device that circulates a predetermined liquid L1, and is used outside the user's body together with the control device 150. The circulation device 160 is connected to the liquid circulation path 40 of the blood pump 1 via the cable 140. The circulation device 160 includes a device (not shown, for example, a pump) that gives kinetic energy to the predetermined liquid L1, and a filter (not shown) that removes foreign matters such as fixed substances from the predetermined liquid L1.

The blood pump 1 according to the embodiment basically has the same configuration as that of the conventional blood pump 901, but is different from the conventional blood pump 901 in that a fixed matter removing member is provided.
In addition, since it has the same structure about the component which attached | subjected the same code | symbol, the already demonstrated description may be abbreviate | omitted.

As shown in FIG. 2, the blood pump 1 according to the embodiment includes a fixed unit 10, a rotating unit 20, a rotation driving device 30, a blood pump chamber 32, a liquid circulation path 40, and a fixed substance removing member 60. Is provided.
The fixed part 10 has a cylindrical fixed-side sliding member 12. The stationary-side sliding member 12 has an annular first sliding surface 14 (see FIG. 3B).

The rotating unit 20 includes a rotating side sliding member 22, an impeller 26 and a transmission member 28.
The rotation-side sliding member 22 and the impeller 26 are provided with an internal space so that the transmission member 28 and the adhering matter removing member 60 can be attached thereto, except that the rotation-side sliding member 922 and the impeller in the conventional blood pump 901 are provided. 926 has the same configuration as 926.
The rotation-side sliding member 22 has an annular second sliding surface 24 (see FIG. 3B).

The transmission member 28 is configured to be capable of coupling the support base portion 64 of the fixed object removing member 60 to the outer peripheral side, and holes (reference numerals are illustrated) corresponding to a first ejection hole 66 and a second ejection hole 68 described later. 2) except for having a structure similar to that of the transmission member 928 in the conventional blood pump 901.
The transmission member 28 is rotated at the time of use to transmit a rotational force to the rotation side sliding member 22 (and the entire rotation unit 20).

The rotational drive device 30 generates a rotational force.
The blood pump chamber 32 is located on the outer peripheral side of the fixed side sliding member 12 and the rotation side sliding member 22.

The liquid circulation path 40 includes a liquid inlet 42, a liquid supply chamber 44, a liquid passage chamber 46, and a liquid outlet 48.
The liquid supply chamber 44 is located on the inner peripheral side of the support base 64 (described later), more specifically, on the inner peripheral side of the transmission member 28.
The liquid passage chamber 46 is located on the inner peripheral side of the fixed side sliding member 12 and the rotation side sliding member 22.

The blood pump 1 is used in a state where the first sliding surface 14 and the second sliding surface 24 are in contact with each other and allowing a predetermined liquid L1 to pass through the liquid passage chamber 46. In use, the blood pump 1 allows a predetermined liquid L1 to pass through the liquid passage chamber 46 from the rotation-side sliding member 22 side toward the fixed-side sliding member 12 side. The blood pump 1 supplies a predetermined liquid L1 from the liquid supply chamber 44 to the liquid passage chamber 46 when in use. The supply is performed through ejection holes (first ejection hole 66 and second ejection hole 68) described later.

The sticking matter removing member 60 has

protrusions

62 and 63 and a support base 64 as shown in FIGS. The fixed object removing member 60 rotates together with the transmission member 28 in use. The symbol d in FIG. 4C indicates the direction of rotation during use.

The fixed object removing member 60 is separate from the transmission member 28 and is coupled to the transmission member 28 in use. More specifically, the support base 64 in the fixed object removing member 60 is coupled to the outer peripheral side of the transmission member 28 (see FIG. 3). Various methods can be used for coupling the fixed object removing member 60 and the transmission member 28. Examples of the method include a method of forming a pin attachment hole in the fixed object removing member 60 and the transmission member 28 and connecting them with a pin, and a method of connecting by a frictional force between the fixed object removing member 60 and the transmission member 28. can do.

The fixed object removing member 60 has two protrusions as protrusions. The

protrusions

62 and 63 constituting the two protrusions are arranged at equal intervals on the circumference around the rotation axis a of the rotation-side sliding member 22 (see FIG. 4C). Each of the

protrusions

62 and 63 has the same shape.

The

protrusions

62 and 63 are close to at least one of the first sliding surface 14 and the second sliding surface 24 (both in the embodiment, see FIG. 3) from the inner peripheral side. The

protrusions

62 and 63 are at positions that cross a plane including the first sliding surface 14. The

protrusions

62 and 63 are located on the outer peripheral side of the support base 64.

One of the directions parallel to the rotation axis a of the rotation-side sliding member 22 (the direction along the z-axis in the drawing) is defined as a first direction, and the direction opposite to the first direction is defined as a second direction. When one end of the ends when viewed in the circumferential direction is the one side end 62a and the end opposite to the one side end 62a is the other end 62b, the protrusion 62 is The one side end portion 62a is located on the first direction side with respect to the other side end portion 62b, and has a shape toward the second direction side as it approaches the other side end portion 62b from the one side end portion 62a.

In the embodiment, when the direction in which the predetermined liquid L1 flows in the liquid passage chamber 46 during use is viewed along a direction parallel to the axial direction, the flow direction as a whole (see the arrow in FIG. 3B). .)), The first direction is the upstream side (that is, the first direction is the upward direction in FIG. 3 and FIG. 4B), and the one end 62a is the front side during rotation. Become. Since the protrusion 63 is the same as the protrusion 62, the illustration and description of the reference numerals are omitted. The

protrusions

62 and 63 have a flat plate shape.

The

projections

62 and 63 can be simply said to be inclined with respect to the rotation axis a. Note that the optimum value of the inclination of the protrusion varies depending on the size and structure of the blood pump, particularly the position of the ejection hole. The magnitude of the inclination of the protrusion shown in the embodiment is merely an example.

The blood pump 1 has a smaller distance of 0.01 mm or more among the shortest distance between the

protrusions

62 and 63 and the stationary sliding member 12 and the shortest distance between the protrusion 62 and the rotating sliding member 22. It is comprised so that it may be 0.05 mm or more. The distance is preferably 1.00 mm or less. The distance can be set to 0.20 mm, for example.

The support base 64 supports the

protrusions

62 and 63. The support base 64 has a cylindrical shape whose central axis coincides with the rotation axis a (see FIGS. 3 and 4). The outer peripheral surface of the support base 64 faces the liquid passage chamber 46 (see FIG. 3).

The support base 64 has an ejection hole for ejecting the predetermined liquid L1 from the liquid supply chamber 44 to the liquid passage chamber 46 when in use. The support base 64 has a first ejection hole 66 and a second ejection hole 68 as the ejection holes.
The support base 64 has one first ejection hole 66 for each protrusion. That is, the support base 64 has two first ejection holes 66. The first ejection holes 66 are at positions different from the

protrusions

62 and 63 in the axial direction. The first ejection holes 66 are located on the upstream side (first direction side) of the flow as a whole rather than the immediate vicinity of the

protrusions

62 and 63.

The second ejection hole 68 is located at a position different from the protrusion 62 in the circumferential direction. The support base 64 has two second ejection holes 68.
The second ejection hole 68 is at a position upstream of a plane including the first sliding surface 14 when in use. In addition, the 2nd ejection hole 68 may exist in the position containing the said plane.

Hereinafter, effects of the blood pump 1 and the auxiliary artificial heart system 100 according to the embodiment will be described.

Since the blood pump 1 according to the embodiment includes the fixed matter removing member 60 having the

protrusions

62 and 63, the fixed matter is prevented from becoming a large lump, and the flow of a predetermined liquid is prevented from being impeded suddenly. Can be a blood pump.

Further, according to the blood pump 1 according to the embodiment, since the blood pump is used while allowing the predetermined liquid L1 to pass through the liquid passage chamber 46 as in the case of the conventional blood pump, the operation stability is increased, It can be used in places where reliable operation is required.

Further, according to the blood pump 1 according to the embodiment, the smaller one of the shortest distance between the

protrusions

62 and 63 and the fixed-side sliding member 12 and the shortest distance between the

protrusions

62 and 63 and the rotating-side sliding member 22. Since the distance is 0.01 mm or more, it is possible to ensure safety even when the protrusion is sufficiently separated from each sliding member and an external force is applied to the blood pump.

In addition, according to the blood pump 1 according to the embodiment, the fixed object removing member 60 rotates together with the transmission member 28 during use, so that a speed difference is created between the protrusion and the first sliding surface, and the first sliding is performed. It becomes possible to positively peel off the fixed matter in the vicinity of the surface.

In addition, according to the blood pump 1 according to the embodiment, the adhering matter removing member 60 is separate from the transmission member 28 and is coupled to the transmission member 28 in use. Can be facilitated.

Further, according to the blood pump 1 according to the embodiment, since the

protrusions

62 and 63 are located at a position crossing the plane including the first sliding surface 14, most of the adhering matter adhering to the vicinity of the first sliding surface is peeled off. It becomes possible to make it.

Further, according to the blood pump 1 according to the embodiment, the

protrusions

62 and 63 constituting the plurality of protrusions are arranged at equal intervals on the circumference around the rotation axis a of the rotation-side sliding member 22. Therefore, it is possible to evenly distribute the weight balance around the rotation axis and to stably rotate the fixed object removing member.

In addition, according to the blood pump 1 according to the embodiment, since the

protrusions

62 and 63 are all formed in the same shape, the weight balance is more evenly distributed around the rotation axis, and the fixed object removing member is further stabilized. Can be rotated.

In addition, according to the blood pump 1 according to the embodiment, the blood pump 1 further includes the liquid supply chamber 44 positioned on the inner peripheral side of the support base portion 64, and from the liquid supply chamber 44 to the liquid passage chamber 46 when in use. Since the predetermined liquid L1 is supplied, the liquid supply chamber is located on the inner peripheral side of the liquid passage chamber, and the path for supplying the predetermined liquid to the liquid passage chamber can be made compact.

Further, according to the blood pump 1 according to the embodiment, the support base 64 has the ejection holes (the first ejection hole 66 and the second ejection hole 68), and therefore, a predetermined liquid is provided in the liquid passage chamber using a simple configuration. Can be supplied.

In addition, according to the blood pump 1 according to the embodiment, the support base portion 64 has the first ejection holes 66 located at positions different from the

protrusions

62 and 63 as the ejection holes in the axial direction. It is possible to suppress the retention of the predetermined liquid in the vicinity of the protrusion by disposing it at a position that greatly affects the flow of the predetermined liquid in the vicinity of the protrusion.

Further, according to the blood pump 1 according to the embodiment, the support base 64 has the second ejection holes 68 as the ejection holes at positions different from the

protrusions

62 and 63 in the circumferential direction. Placed at a position that greatly affects the flow of a predetermined liquid near the first sliding surface and near the second sliding surface, and immediately removes the adhered material that has peeled off, preventing the adhered material from reattaching to each part. It becomes possible to do.

Further, according to the blood pump 1 according to the embodiment, the

protrusions

62 and 63 are such that the one end 62a is located on the first direction side with respect to the other end 62b, and the other end from the one end 62a. Since the shape is directed toward the second direction as it approaches the end 62b, it is possible to control the flow of a predetermined liquid by giving the protrusion a property like a rotary blade.

Further, according to the blood pump 1 according to the embodiment, the first direction is the upstream side, and the other side end 62b of the

protrusions

62 and 63 is the front side during rotation. It is possible to stabilize the flow of the predetermined liquid and to prevent the predetermined liquid from staying in the downstream of the protrusion.

Since the auxiliary artificial heart system 100 according to the embodiment includes the blood pump according to the embodiment, it is possible to suppress a sudden flow of a predetermined liquid from being interrupted, and the auxiliary artificial heart system has very high operational stability. It becomes a heart system.

As mentioned above, although this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment. The present invention can be implemented in various modes without departing from the spirit thereof, and for example, the following modifications are possible.

(1) The number, material, shape, position, size, and the like of the constituent elements described in the above embodiments are exemplifications, and can be changed within a range not impairing the effects of the present invention.

(2) In the above embodiment, the one side end 62a is located closer to the first direction than the other side end 62b, and the closer to the other side end 62b from the one side end 62a, the second direction side. However, the present invention is not limited to this. FIG. 5 is a diagram of the fixed object removing member 70 in the first modification. FIG. 5A is a perspective view, and FIG. 5B is a top view. FIG. 6 is a diagram of the fixed object removing member 70 in the second modification. FIG. 6A is a perspective view, and FIG. 6 is a top view. For example,

projections

72 and 73 having a flat plate shape and extending in the axial direction as shown in FIG. 5 and

projections

82 and 83 having a rod shape as shown in FIG. 6 may be used. In addition, flat plate shapes, rod shapes, and other shapes (for example, curved plate shapes, polygonal column shapes, columnar shapes, polygonal pyramid shapes, columnar shapes, spherical shapes, free-form surfaces other than those described in the embodiments and modifications) A protrusion having various shapes such as a shape or a shape obtained by combining these shapes may be used.

(3) In the above embodiment, the

protrusions

62 and 63 having the same shape are used, but the present invention is not limited to this. FIG. 7 is a diagram of the fixed object removing member 90 in the third modification. FIG. 7A is a perspective view, and FIG. 7B is a side view seen from the protrusion 92 side. In FIG.7 (b), the processus | protrusion 63 located in a back surface is displayed with the broken line. For example, projections having different shapes such as the projection 92 and the projection 63 in FIG. 7 may be used. The protrusion 92 and the protrusion 63 have shapes that are reversed like a mirror image.

(4) As shown in FIG. 7, in the protrusion 92 of the fixed object removing member 90 in Modification 3, the first direction is the upstream side, as opposed to the

protrusions

62, 63, and the other end portion of the protrusion 92. 92b is the front side during rotation. By having such a configuration, a predetermined liquid flow different from the flow as a whole is created, and the predetermined liquid is sent to a place where the flow rate of the predetermined liquid is low, such as the upstream end of the liquid passage chamber, It becomes possible to accelerate the cleaning of the part.

(5) In each of the above-described embodiments, the first ejection hole 66 located on the upstream side of the flow as a whole (the first direction side in the embodiment) is used rather than the immediate vicinity of the

protrusions

62, 63. Is not limited to this. In particular, when a projection such as the projection 92 in Modification 3 is used, as shown in FIG. 7, the entire flow is more downstream than the nearest portion of the projection 92 (the second direction side in the embodiment). A first ejection hole such as a certain first ejection hole 96 may be used. Moreover, you may use the 1st ejection hole in the position which overlaps with protrusion.

(6) In the above embodiment, the fixed object removing member 60 that is separate from the transmission member 28 and is coupled to the transmission member 28 when used is used, but the present invention is not limited to this. A non-separable adhering matter removing member (that is, a support base part of which is a part of the transmission member) formed integrally with the transmission member may be used.

(7) Although the number of protrusions is two in the above embodiment and each modification, the present invention is not limited to this. The number of protrusions may be only one, or three or more. Moreover, in the said embodiment and each modification, although each protrusion is arrange | positioned at equal intervals on the periphery centering on the rotating shaft of a rotation side sliding member, this invention is not limited to this. Absent. The protrusions may be arranged at unequal intervals.

(8) Although the first ejection holes 66 and 96 and the second ejection holes 68 are used in the embodiment and each modification, the present invention is not limited to this. You may use the 1st ejection hole and the 2nd ejection hole of position, shape, and number other than above. Further, an ejection hole other than the first ejection hole and the second ejection hole (for example, an ejection hole at a position different from the protrusion in both the axial direction and the circumferential direction) may be used. In the blood pump of the present invention, the position, shape, number, etc. of the ejection holes can be set according to the shape of the protrusion and the structure of the blood pump.

DESCRIPTION OF SYMBOLS 1,901 ... Blood pump, 10 ... Fixed part, 12 ... Fixed side sliding member, 14 ... First sliding surface, 20,920 ... Rotating part, 22, 922 ... Rotating side sliding member, 24 ... Second slide Moving surface, 26, 926 ... impeller, 28, 928 ... transmission member, 30 ... rotary drive device, 32 ... blood pump chamber, 40 ... liquid circulation path, 42 ... liquid inlet, 44 ... liquid supply chamber, 46 ... liquid passage chamber 48 ... Liquid outlet, 52 ... Gap, 60, 70, 80, 90 ... Fixed matter removing member, 62, 63, 72, 73, 82, 83, 92 ... Projection, 62a, 92a ... One end, 62b, 92b ... the other end, 64 ... support base, 66, 96 ... first ejection hole, 68 ... second ejection hole, 100 ... auxiliary artificial heart system, 120, 130 ... artificial blood vessel, 140 ... cable, L1 ... predetermined Liquid, L2 ... blood

Claims

A fixed-side sliding member having an annular first sliding surface;
A rotation-side sliding member having an annular second sliding surface;
A blood pump chamber located on the outer peripheral side of the fixed-side sliding member and the rotating-side sliding member;
A liquid passage chamber located on the inner peripheral side of the fixed side sliding member and the rotation side sliding member,
A blood pump used in a state in which the first sliding surface and the second sliding surface are in contact with each other and passing a predetermined liquid through the liquid passage chamber;
The apparatus further comprises a fixed object removing member having a protrusion that is close to an inner peripheral side with respect to at least one of the first sliding surface and the second sliding surface and a support base that supports the protrusion. Blood pump.
The blood pump according to claim 1,
Of the shortest distance between the protrusion and the fixed sliding member and the shortest distance between the protrusion and the rotating sliding member, the smaller distance is 0.01 mm or more.
The blood pump according to claim 1 or 2,
The blood pump is
A rotational drive device that generates rotational force;
A transmission member for transmitting the rotational force to the rotation side sliding member by rotating at the time of use;
The blood adhering member removing member rotates together with the transmission member during use.
The blood pump according to claim 3,
The fixed matter removing member has a plurality of protrusions as the protrusions,
Each of the protrusions constituting the plurality of protrusions is arranged at equal intervals on a circumference centered on the rotation axis of the rotation-side sliding member.
The blood pump according to claim 4,
The blood pumps are characterized in that all the protrusions have the same shape.
The blood pump according to any one of claims 3 to 5,
The protrusion is located on the outer peripheral side of the support base,
The support base has a cylindrical shape whose center axis coincides with the rotation axis of the rotation side sliding member,
The outer peripheral surface of the support base faces the liquid passage chamber,
The blood pump further includes a liquid supply chamber located on the inner peripheral side of the support base, and supplies the predetermined liquid from the liquid supply chamber to the liquid passage chamber when in use. .
The blood pump according to claim 6,
The blood pump according to claim 1, wherein the support base has an ejection hole for ejecting the predetermined liquid from the liquid supply chamber to the liquid passage chamber when in use.
The blood pump according to claim 7,
The blood pump according to claim 1, wherein the support base has a first ejection hole as the ejection hole at a position different from the projection in the axial direction or a position overlapping the projection.
The blood pump according to claim 7 or 8,
The support base has a second ejection hole at a position different from the protrusion in the circumferential direction as the ejection hole.
The blood pump according to any one of claims 3 to 9,
One direction among the directions parallel to the rotation axis of the rotation side sliding member is a first direction, and the direction opposite to the first direction is a second direction,
When one end of the ends when the protrusion is viewed in the circumferential direction is one end, and the end opposite to the one end is the other end,
The protrusion has a shape in which the one side end is located closer to the first direction than the other side end, and toward the second direction as it approaches the other side end from the one side end. A blood pump characterized by comprising:
A blood pump according to any of claims 1 to 10,
An auxiliary artificial heart system comprising: a circulator that circulates a predetermined liquid.