JP5623203B2 - Centrifugal blood pump and centrifugal blood pump device - Google Patents

Description

  The present invention relates to a centrifugal blood pump for feeding blood and a centrifugal blood pump apparatus using the centrifugal blood pump.

Recently, there are increasing examples of using centrifugal blood pumps for extracorporeal blood circulation, artificial heart pumps, and the like in an oxygenator. Centrifugal pumps use a system that transmits driving torque from an external motor using magnetic coupling by completely eliminating physical communication between the outside and the blood chamber in the pump and preventing invasion of bacteria. Is used.
As such a centrifugal blood pump, there is an artificial heart centrifugal pump disclosed in Japanese Patent Laid-Open No. 2002-349482 (Patent Document 1).
In this centrifugal pump for artificial heart, the impeller shaft portion is a cylindrical portion 1, the centrifugal blade 3 is disposed at the lower portion thereof, the permanent magnet 11 is provided at the bottom portion, and the impeller is driven by a drive device that generates a rotating magnetic field provided at the bottom portion of the casing. Rotate. A pivot bearing is provided at the center of the bottom of the impeller. In the illustrated embodiment, a pivot shaft 6 is provided on the impeller side, and a pivot receiver 10 is provided on the bottom wall side of the casing. The materials of the pivot shaft 6 and the pivot receiver 10 are selected from materials having different hardnesses, such as a set of ceramics and an ultra high molecular weight pump. Further, the diameters of the pivot shaft and the spherical surface of the pivot receiver are substantially equal.

JP 2002-349482 A

In the thing of patent document 1, since it has the bearing mechanism of the impeller in the housing comprised by the pivot axis | shaft and the pivot receiver, a bearing mechanism etc. are unnecessary and it has the advantage of size reduction.
However, due to the rotation of the impeller, heat is generated in the pivot bearing portion, which may cause blood damage due to the heat generation.
Accordingly, the present invention provides a centrifugal blood pump that uses a pivot bearing mechanism and generates less heat in the pivot bearing portion and less blood damage caused by the heat generation, and a centrifugal blood using the centrifugal blood pump. A pump device is provided.

What achieves the above object is as follows.
(1) A blood is provided by rotation of the impeller by an impeller rotation torque generating means that includes a housing and an impeller that is rotatably accommodated in the housing, and sucks and rotates the impeller from the outside of the housing. A centrifugal blood pump for feeding
The housing includes a blood inflow port extending above the center portion, and a blood outflow port provided in a side portion of the housing,
The impeller includes a plate-like member that is provided at a central portion and can contact a blood flow flowing in from the blood inflow port, and a magnetic body.
And a pivot bearing mechanism formed on the lower surface of the plate member of the housing and the impeller ,
The plate-like member of the impeller is located on an extension line of the central axis of the blood inlet port of the housing,
The impeller includes an opening provided on an upper surface of the central portion, and a passage communicating with the opening and extending in a lower surface direction of the impeller, and the plate-like member is provided so as to cross the passage. And the impeller includes an annular recess provided in the passage, and the plate-like member is housed in a bottom portion of the annular recess, and is further formed in an upper surface of the plate-like member. A centrifugal blood pump in which the plate-like member is made of a heat conductive material.
( 2 ) The housing includes a projecting portion that extends a predetermined length from the inner bottom surface of the housing toward the blood inflow port, and the impeller extends a predetermined length from the lower surface of the central portion of the impeller toward the opening, and A protrusion housing portion into which the protrusion of the housing can enter, and one of the pivot bearing mechanisms is formed at the apex of the protrusion of the housing, and the other of the pivot bearing mechanisms Is the centrifugal blood pump according to the above ( 1 ), which is formed on the lower surface of the plate-like member of the impeller.
( 3 ) The impeller has a plurality of blood flow paths that communicate with the opening and extend to the side of the impeller, and the plate-like member passes through the passage without blocking the blood flow path. The centrifugal blood pump according to ( 2 ), wherein the centrifugal blood pump is provided in the vicinity of the opening so as to be divided into an opening side and the protruding portion storage portion side.

( 4 ) The centrifugal blood pump according to any one of ( 2) and (3 ), wherein the protruding portion of the housing is tapered toward the apex.
( 5 ) The centrifugal blood pump according to any one of ( 2 ) to ( 4 ), wherein the plate-like member prevents communication between the opening and the protruding portion storage portion.
( 6 ) The pivot bearing mechanism includes a pivot bearing including a recess formed on one of the apex of the protrusion of the housing and the bottom surface of the plate-like member of the impeller, and the protrusion of the housing. Any one of the above ( 2 ) to ( 5 ), which is formed on the other of the apex of the impeller and the bottom surface of the plate-like member of the impeller and having a shape corresponding to the shape of the recess A centrifugal blood pump according to claim 1.
( 7 ) The centrifugal blood pump according to ( 6 ), wherein the concave portion and the pivot shaft of the pivot bearing have a substantially hemispherical shape, and the radii of both are substantially equal.

( 8 ) The pivot bearing mechanism is integrally formed on the bottom surface of the plate-like member of the impeller and the pivot bearing formed of a recess formed at the apex of the protruding portion of the housing, and the shape of the recess The centrifugal blood pump according to any one of ( 2 ) to ( 7 ), wherein the centrifugal blood pump is configured by a pivot shaft having a shape corresponding to.
( 9 ) The pivot bearing mechanism is formed at the apex portion of the projecting portion of the housing and the pivot bearing formed of a recess formed on the bottom surface of the plate-like member of the impeller, and corresponds to the shape of the recess. The centrifugal blood pump according to any one of ( 2 ) to ( 7 ), wherein the centrifugal blood pump is configured by a pivot shaft having the shape described above.
( 10 ) The pivot bearing mechanism includes a pivot bearing formed of a recess formed at the apex of the protruding portion of the housing, and a spherical pivot shaft attached to a central opening of the plate-like member of the impeller. The centrifugal blood pump according to any one of ( 2 ) to ( 7 ), which is configured.
(11) The impeller includes an annular recess provided in the passage and a ring-shaped fixing member disposed on an upper surface of the plate-like member, and the recess formed on the upper surface of the plate-like member has the plate-like shape. The centrifugal blood pump according to any one of (1) to (10), wherein the centrifugal blood pump is formed by an upper surface of a member and the ring-shaped fixing member.

Moreover, what achieves the said objective is as follows.
( 12 ) A centrifugal type comprising the centrifugal blood pump according to any one of (1) to ( 11 ) and an impeller rotational torque generating means for attracting the magnetic body of the impeller and rotating the impeller. Blood pump device.

  The centrifugal blood pump of the present invention includes a housing and an impeller rotatably accommodated in the housing, and rotates the impeller by means of impeller rotational torque generation means for sucking and rotating the impeller from the outside of the housing. A centrifugal blood pump for delivering blood by the housing, wherein the housing includes a blood inflow port extending above the central portion and a blood outflow port provided in a side portion of the housing, and the impeller is provided in the central portion. And a plate-like member capable of contacting the blood flow flowing in from the blood inflow port, and a magnetic body, and further, a pivot bearing mechanism formed on the lower surface of the plate-like member of the housing and the impeller. For this reason, the plate-like member of the impeller constituting the pivot bearing mechanism is surely brought into contact with the blood flow flowing in from the blood inflow port, so the pivot bearing mechanism formed on the plate-like member is cooled by the blood flow, Heat generation in the pivot bearing mechanism and blood damage due to the heat generation can be prevented.

FIG. 1 is a front view of a centrifugal blood pump according to an embodiment of the present invention. FIG. 2 is a plan view of the centrifugal blood pump shown in FIG. FIG. 3 is a perspective view of the centrifugal blood pump shown in FIG. 4 is a cross-sectional view taken along the line AA in FIG. 2 (the BB line for the impeller). FIG. 5 is a front view of an upper housing used in the centrifugal blood pump shown in FIG. 6 is a perspective view of a lower housing used in the centrifugal blood pump shown in FIG. FIG. 7 is a perspective view of an impeller used in the centrifugal blood pump shown in FIG. FIG. 8 is a front view of an impeller used in the centrifugal blood pump shown in FIG. FIG. 9 is a plan view of the impeller shown in FIG. FIG. 10 is an exploded view of an impeller used in the centrifugal blood pump shown in FIG. FIG. 11 is an exploded view of an impeller (excluding a magnetic body) used in the centrifugal blood pump shown in FIG. FIG. 12 is a sectional view of a centrifugal blood pump according to another embodiment of the present invention. FIG. 13 is a partially enlarged view of FIG. FIG. 14 is a partially enlarged sectional view of a centrifugal blood pump according to another embodiment of the present invention. FIG. 15 is a partially enlarged sectional view of a centrifugal blood pump according to another embodiment of the present invention. FIG. 16 is a partially broken sectional view of the centrifugal blood pump device of the present invention.

A centrifugal blood pump and a centrifugal blood pump apparatus according to the present invention will be described with reference to embodiments shown in the drawings.
The centrifugal blood pump 1 of the present invention includes a housing 2 and an impeller 3 that is rotatably housed in the housing 2, and generates impeller rotational torque for sucking and rotating the impeller from the outside of the housing 2. Blood is fed by rotation of the impeller 3 by the means 50.
In the centrifugal blood pump 1 of the present invention, the housing 2 includes a blood inflow port 22 extending above the central portion, and a blood outflow port 23 provided on the side of the housing 2 (specifically, the lower housing 21). The impeller 3 includes a plate-like member 35 that is provided on the upper surface of the central portion, can contact the blood flow flowing in from the blood inflow port 22, and a magnetic body 41, and further includes the housing 2 and the impeller 3. A pivot bearing mechanism formed on the lower surface of the plate-like member 35 is provided.

As shown in FIGS. 1 to 11, the centrifugal blood pump 1 of this embodiment includes a housing 2 and an impeller 3 that is rotatably housed therein. The impeller 3 rotates in the housing 2 and sends blood by centrifugal force during rotation.
As shown in FIGS. 1 to 6, the housing 2 includes an upper housing 20 and a lower housing 21 that is liquid-tightly fixed to the upper housing. An impeller storage chamber (blood chamber) communicating with the blood inflow port 22 and the blood outflow port 23 is formed in the housing 2. In particular, in the centrifugal blood pump 1 of this embodiment, the housing 2 includes a blood inflow port 22 extending above the central portion, and a blood outflow port provided on the side of the housing 2 (specifically, the lower housing 21). 23 and a protrusion 25 extending from the inner bottom surface of the housing 2 (specifically, the lower housing 21) by a predetermined length in the direction of the blood inflow port.
The upper housing 20 includes a blood inlet port 22 and a blood outlet port 23, and is made of a nonmagnetic material. A blood chamber communicating with the blood inlet port 22 and the blood outlet port 23 is formed in the upper housing 20. The blood inflow port 22 is provided so as to protrude substantially vertically from the vicinity of the center of the upper surface of the upper housing 20. The blood inflow port 22 is not limited to such a straight tube, and may be a curved tube or a bent tube. As shown in FIGS. 2 and 3, the blood outflow port 23 is provided so as to protrude in a substantially tangential direction from the side surface of the upper housing 20 which is formed in a thin and substantially cylindrical shape.
4 and 6, the lower housing 21 includes a flange portion 27, a central recess 24 protruding from the flange portion, and a protrusion protruding in the direction of the blood inflow port 22 from a substantially central portion of the central recess 24. 25. The protruding portion 25 of the lower housing 21 is reduced in diameter in a tapered shape toward the apex portion. In particular, in this embodiment, the protruding portion 25 extends toward the blood inflow port and is reduced in diameter in a tapered shape. A pivot bearing mechanism forming member 26 is embedded in the apex portion of the protruding portion 25. In the center of the pivot bearing mechanism forming member 26, a recess 28 is formed that forms a bearing portion of the pivot bearing mechanism. As the pivot bearing mechanism forming member 26, a resin (for example, polyethylene, polyacetal), metal, ceramics, or the like is preferable, and the above-described resins are particularly preferable.
In addition, when the impeller 3 mentioned later is a thing with thin thickness, the lower housing 21 may not have the protrusion part mentioned above.

As shown in FIGS. 4 and 7 to 11, the impeller 3 includes an impeller body and a plurality of magnetic bodies 41 housed in the impeller body.
In the centrifugal blood pump 1 of this embodiment, the impeller 3 includes an opening 36 provided on the upper surface of the central portion, a passage 30 that communicates with the opening 36 and extends in the lower surface direction of the impeller, and a passage 30. A plate-like member 35 that is provided so as to cross the blood and flows into the blood inflow port and can contact with blood (blood flow) that has passed through the opening 36 is provided.
Further, in this embodiment, the impeller 3 has an opening 36 provided on the upper surface of the central portion, and a protrusion that extends in the direction of the opening 36 from the lower surface of the central portion and allows the protrusion 25 of the housing 2 to enter. A plurality of blood flow paths 31 that communicate with the opening portion 36 and extend to the side of the impeller 3, and protrude from the opening 36 without blocking the blood flow path 31. The plate-like member 35 provided in the vicinity of the opening 36 and the magnetic body 41 are provided so as to divide the part storage portion 48. Further, pivot bearing mechanisms 28 and 39 are provided on the apex of the protrusion 25 that is a predetermined length above the bottom surface of the housing 2 and the lower surface of the plate-like member 35 of the impeller 3.
The impeller 3 is not limited to one having a closed type blood flow path, and may have a blood flow path having an open upper surface. For example, the impeller may be of a so-called blade type. Further, the impeller 3 may be a thin one. In this case, the lower housing 21 does not have the above-described protruding portion, and the impeller does not have the protruding portion storage portion. There may be.
The impeller body of this embodiment includes an impeller upper member 32, an impeller intermediate member 33 attached to the lower surface of the impeller upper member 32, and an impeller in which a magnetic body 41 is housed while being attached to the lower surface of the impeller intermediate member 33. A lower member 34 is provided. Between the impeller upper member 32 and the impeller intermediate member 33, a plurality of blood flow paths whose upper and lower surfaces are not opened, whose one end communicates with the opening 36 and whose other end opens at the side of the impeller 3. 31 is formed. In this embodiment, the blood flow channel 31 extends linearly with substantially the same width, and the blood flow channel is provided so as to be substantially equiangular with respect to the center of the opening 36. It has been. Further, as shown in FIG. 7, the impeller 3 includes a plurality of protrusions 32b formed between the blood flow paths.
As shown in FIGS. 9 to 11, the impeller upper member 32 is a disk-shaped member having a predetermined thickness with an opening 36 at the center and a raised umbrella shape toward the center. The bottom surface is formed with a plurality of recesses 32 a communicating with the opening 36, and the recesses 32 a constitute the blood flow path 31.

Further, the impeller intermediate member 33 is a disk-shaped member having a predetermined thickness having a penetrating portion (constituting a part of the passage 30) in the central portion and having an umbrella shape slightly rising toward the central portion. The upper surface includes a plurality of ribs 33b that enter the recesses 32a of the impeller upper member 32. The upper opening 33 a of the impeller intermediate member 33 forms a lower portion of the impeller opening 36 and an upper portion of the protruding portion storage portion 48.
Further, an impeller lower member 34 having an opening 34 a (which constitutes a lower side portion of the protruding portion storage portion 48) at the center is fixed to the lower surface of the impeller intermediate member 33. The opening 34 a constitutes a lower side portion of the protruding portion storage portion 48. As shown in FIGS. 4, 10, and 11, the impeller lower member 34 includes a plurality of magnetic substance accommodation recesses 43 and a wall part 34 b that forms between the magnetic substance accommodation recesses. Further, in this embodiment, the plurality (preferably 3 to 10) of the magnetic substance housing recesses 43 are plural, preferably 3 to 10, particularly, so as to be equiangular with respect to the center of the opening 34a. Preferably, it is 4-8. The magnetic body 41 is housed in each magnetic body housing recess 43. As the magnetic body 41, magnetic stainless steel, a permanent magnet or the like is used. Further, the impeller lower member 34 of the impeller main body is configured to reduce in diameter toward the lower surface so as to correspond to the shape (inner surface shape) of the lower housing 21. The impeller 3 has a frame shape having a flange portion at the center upper portion as shown in FIG.

The impeller 3 separates the opening 36 and the protruding portion storage portion 48 without closing the blood flow path 31 of the impeller upper member 32. In other words, the passage 30 is divided into the opening side (blood inflow side) and the protruding portion. It has the plate-shaped member 35 provided so that it might divide into the accommodating part side. Specifically, as shown in FIGS. 10 and 11, the impeller intermediate member 33 of the impeller body includes an annular recess provided in the upper opening 33a, and the plate-like member 35 is accommodated in the annular recess. Further, the plate-like member 35 is fixed to the impeller body (impeller intermediate member) by a ring-like fixing member 37 disposed in the annular recess. For this reason, the upper opening 33 a of the impeller intermediate member 33 is divided by the plate-like member 35 into portions that form the lower portion of the impeller opening 36 and the upper portion of the protruding portion storage portion 48. In other words, the plate-like member 35 is provided so as to cross the upper opening 33 a in the middle of the upper opening 33 a of the impeller intermediate member 33. In the blood pump 1, the plate member 35 is provided in the vicinity of the opening 36 of the impeller 3. The distance between the opening end of the opening 36 and the plate-like member 35 is preferably about 1 to 10 mm. Further, as shown in FIG. 13, the ring-shaped fixing member 37 is preferably in a form in which the corners on the inner surface are rounded. In the impeller 3, as shown in FIG. 13, the plate-like member 35 is housed in the bottom of the above-described annular recess provided in the passage 30, and is further formed on the upper surface of the plate-like member 35. Has a recess. Specifically, the recess formed on the upper surface of the plate member 35 is formed by the upper surface of the plate member 35 and the ring-shaped fixing member 37.
The impeller may be provided with a plurality of small-diameter through holes 38 that reach the lower surface from the upper surface of the impeller 3 as in the centrifugal blood pump 10 of the embodiment shown in FIG. The through hole 38 does not communicate with the blood flow path 31 of the impeller 3 and penetrates a portion where the impeller protrusion 32b is formed. It is preferable to provide a plurality of (for example, 3 to 8) through holes 38. By having such a plurality of through holes 38, it can be expected that the pressure balance between the upper surface of the impeller 3 and the inner surface of the upper housing 20 and between the lower surface of the impeller and the inner surface of the lower housing 21 will be improved.

In this embodiment, the plate-like member 35 of the impeller 3 is positioned on the extension line of the central axis of the blood inlet port 22 of the housing 2. Further, the plate-like member 35 hinders communication between the opening 36 of the impeller 3 and the protruding portion storage portion 48. For this reason, the impeller passes through the opening 36 and the protrusion accommodating portion 48, and a blood flow that flows on the bottom surface of the impeller is not formed. The plate-like member 35 may have an opening, and a small amount of blood flow that passes through the opening 36 and the protruding portion storage 48 may be formed.
And the protrusion part accommodating part 48 located under the plate-shaped member 35 of the impeller 3 is diameter-reduced toward the plate-shaped member 35 direction, and the protrusion part 35 of the lower housing 21 is made into an inner surface. It can be received in a state having a predetermined gap. The plate-like member 35 of this embodiment has a circular shape corresponding to the annular recess of the impeller intermediate member 33. And it is preferable that the plate-shaped member 35 is formed with the heat conductive material. In particular, the material for forming the plate-like member 35 is preferably a metal material such as stainless steel, aluminum, an aluminum alloy, titanium, or a titanium alloy. Moreover, as thickness of the plate-shaped member 35, it is preferable that it is 0.05-5 mm.

As shown in FIGS. 4 and 13, the blood pump of the present invention is formed on the lower surface of the housing 2 (specifically, the inner surface facing the bottom surface of the impeller 3 of the housing 2) and the plate-like member 35 of the impeller 3. A formed pivot bearing mechanism is provided. In particular, the pump 1 of this embodiment includes pivot bearing mechanisms 28 and 39 on the apex of the protruding portion 25 that is a predetermined length above the bottom surface of the housing 2 and the lower surface of the plate-like member 35 of the impeller 3. One of the pivot bearing mechanisms is formed at the apex portion of the protruding portion 25 of the housing 2, and the other of the pivot bearing mechanisms is formed on the lower surface portion of the plate-like member 35 of the impeller 3.
For this reason, in this blood pump 1, the pivot bearing mechanisms 28 and 39 are located in the vicinity of the opening of the impeller 3. Specifically, the pivot bearing mechanisms 28 and 39 are located close to the opening of the impeller 3 and inside a predetermined length of the impeller.
In the embodiment shown in FIGS. 4 and 13, the pivot bearing mechanism includes a pivot bearing including a recess 28 formed in a pivot bearing mechanism forming member 26 embedded in the apex portion of the protruding portion 25 of the housing 2, and an impeller. 3 is formed on the bottom surface of the plate-like member 35 and is constituted by a pivot shaft 39 having a shape corresponding to the shape of the recess 28. The pivot shaft 39 is a protrusion. The recess 28 of the pivot bearing and the pivot shaft 39 are both substantially hemispherical, and the radii of both are substantially equal. Further, in this embodiment, the inside of the pivot shaft 39 formed on the plate-like member 35 is a concave portion so that blood can flow in and the cooling of the pivot shaft 39 is improved. Yes.

Further, as the pivot bearing mechanism, as in the embodiment shown in FIG. 14, the pivot bearing 46 formed of a recess formed in the bottom surface of the plate-like member 35 a of the impeller 3 and the apex portion of the protruding portion 25 of the housing 2 are embedded. A pivot shaft 47 formed on the pivot bearing mechanism forming member 26 may be used. The pivot shaft 47 is a protrusion having a shape corresponding to the pivot bearing 46 formed of a recess. The recess 46 and the pivot shaft 47 of the pivot bearing are both substantially hemispherical, and the radii of both are substantially equal. Further, in this embodiment, the pivot bearing 46 formed on the plate-like member 35a has a projecting portion on the inner surface, so that the contact with the inflowing blood is good, and the cooling of the pivot bearing 46 is good. Yes.
Further, as the pivot bearing mechanism, as in the embodiment shown in FIG. 15, the pivot bearing mechanism includes a recess 28 formed in a pivot bearing mechanism forming member 26 embedded in the apex portion of the protruding portion 25 of the housing 2. The pivot bearing may be configured by a pivot shaft made of a spherical body 49 attached to the central opening of the plate-like member 35 b of the impeller 3 and corresponding to the shape of the recess 28. The pivot shaft (sphere) 49 protrudes up and down the plate-like member 35b. The radius of the spherical body 49 is slightly smaller than the radius of the recess 28 of the pivot bearing. As the spherical body 49, a ceramic ball, a metal sphere, or the like can be used.

Moreover, it is preferable that an antithrombotic material is fixed to the blood contact surface of the centrifugal blood pump of the present invention.
Antithrombogenic materials include heparin, polyalkylsulfone, ethyl cellulose, acrylate polymer, methacrylic acid ester polymer (for example, poly HEMA [polyhydroxyethyl methacrylate]), hydrophobic segment and hydrophilic segment Block or graft copolymer having both (for example, HEMA-styrene-HEMA block copolymer, HEMA-MMA [methyl methacrylate] block copolymer, HEMA-LMA [lauryl methacrylate] block copolymer) , A block copolymer of PVP [polyvinylpyrrolidone] -MMA, a block copolymer of HEMA-MMA / AA [acrylic acid], a blend polymer obtained by mixing a polymer having an amino group with this block copolymer, and fluorine-containing Tree Preferably, a block copolymer of HEMA-styrene-HEMA, a block copolymer of HEMA-MMA [methyl methacrylate], a block copolymer of HEMA-MMA / AA [acrylic acid], and the like are preferable. And, after coating the hydrophilic resin excluding heparin on the blood contact surface, it is preferable to further fix heparin on the blood contact surface.In this case, in order to fix heparin to the surface of this hydrophilic resin, The hydrophilic resin has any one of a hydroxyl group, an amino group, a carboxyl group, an epoxy group, an isocyanate group, an epoxy group, a thiocyanate group, an acid chloride group, an aldehyde group, and a carbon-carbon double bond, or easily. It is preferable to have a group that can be converted into these groups, particularly preferably the hydrophilic resin. It is to use a blend polymer prepared by mixing a polymer having an amino group, the polymer having an amino group, a polyamine, particularly PEI [polyethylene emissions imine] is preferred.

  In the blood pump of the above-described embodiment, the blood flowing in from the blood inflow port 22 flows into the opening 36 at the center of the rotating impeller 3 and abuts on the plate-like member 35, and then divides each blood flow. It flows into the passage 31. For this reason, the plate-like member 35 is in contact with a blood flow that substantially maintains the flow rate from the blood inflow port, so that the plate-like member is cooled by the abutting blood and is kept in contact with the blood flow. Therefore, heat generation at the bearing forming portion of the plate-like member 35 is prevented.

The centrifugal blood pump device according to the present invention includes the centrifugal blood pump 1 and impeller rotational torque generating means 50 for sucking the magnetic body 41 of the impeller 3 and rotating the impeller 3.
As the centrifugal blood pump 1, the above-described embodiment can be used.
As shown in FIG. 16, the impeller rotational torque generating means 50 includes a rotor 51 housed in the housing and a motor (not shown) for rotating the rotor 51. The housing is provided with a recess that houses the outward projecting portion of the lower housing of the blood pump 1. The rotor 51 is provided on the surface of the blood centrifugal pump 1 and includes a plurality of permanent magnets 52 arranged in an inclined manner corresponding to the inclined arrangement form of the magnetic body 41 provided in the impeller 3. The center of the rotor 51 is fixed to the rotating shaft of the motor. The permanent magnets 52 are provided in plural and at equal angles so as to correspond to the arrangement form (number and arrangement position) of the magnetic bodies 41 of the impeller 3. In addition, as the motor for rotating the rotor 51, a synchronous motor including a DC brushless motor, an asynchronous motor including an induction motor, and the like are used. However, any type of motor may be used. Further, the center of the plurality of permanent magnets 52 and the center of the rotor coincide with each other when the motor rotates.

DESCRIPTION OF SYMBOLS 1 Centrifugal blood pump 2 Housing 3 Impeller 25 Protruding part 35 Plate-like member 36 Opening part 48 Protruding part accommodating part 28, 39 Pivot bearing mechanism

Claims (12)

Blood is fed by rotation of the impeller by means of an impeller rotation torque generating means for sucking and rotating the impeller from the outside of the housing, and a housing and an impeller rotatably accommodated in the housing A centrifugal blood pump that
The housing includes a blood inflow port extending above the center portion, and a blood outflow port provided in a side portion of the housing,
The impeller includes a plate-like member that is provided at a central portion and can contact a blood flow flowing in from the blood inflow port, and a magnetic body.
And a pivot bearing mechanism formed on the lower surface of the plate member of the housing and the impeller ,
The plate-like member of the impeller is located on an extension line of the central axis of the blood inlet port of the housing,
The impeller includes an opening provided on an upper surface of the central portion, and a passage communicating with the opening and extending in a lower surface direction of the impeller, and the plate-like member is provided so as to cross the passage. And the impeller includes an annular recess provided in the passage, and the plate-like member is housed in a bottom portion of the annular recess, and is further formed in an upper surface of the plate-like member. The centrifugal blood pump is characterized in that the plate-like member is made of a heat conductive material. The housing includes a protrusion extending from the inner bottom surface of the housing by a predetermined length in the direction of the blood inflow port, the impeller extending from the lower surface of the central portion of the impeller by a predetermined length in the direction of the opening, and the housing A projecting portion accommodating portion capable of entering the projecting portion, and one of the pivot bearing mechanisms is formed at a vertex of the projecting portion of the housing, and the other of the pivot bearing mechanisms is The centrifugal blood pump according to claim 1 , wherein the centrifugal blood pump is formed on a lower surface portion of a plate-like member of the impeller. The impeller has a plurality of blood flow paths that communicate with the opening and extend to a side of the impeller, and the plate-like member opens the passage to the opening without closing the blood flow path. The centrifugal blood pump according to claim 2, wherein the centrifugal blood pump is provided in the vicinity of the opening and so as to be divided into the protruding portion storage portion side. The centrifugal blood pump according to claim 2 or 3 , wherein the protruding portion of the housing is tapered in a tapered shape toward the apex portion. The centrifugal blood pump according to any one of claims 2 to 4 , wherein the plate-like member prevents communication between the opening and the protruding portion storage portion. The pivot bearing mechanism includes a pivot bearing including a recess formed on one of the apex of the protrusion of the housing and the bottom surface of the plate-like member of the impeller, and the apex of the protrusion of the housing. and wherein formed on one of the other of the bottom surface of the plate-like member of the impeller, centrifugal according to any one of 5 the preceding claims 2 is constituted by a pivot shaft having a shape corresponding to the shape of the recess Blood pump. The centrifugal blood pump according to claim 6 , wherein the concave portion and the pivot shaft of the pivot bearing have a substantially hemispherical shape, and the radii of both are substantially equal. The pivot bearing mechanism is integrally formed on a bottom surface of the plate-like member of the impeller and a pivot bearing formed of a concave portion formed at the apex portion of the protruding portion of the housing, and corresponds to the shape of the concave portion. The centrifugal blood pump according to any one of claims 2 to 7 , comprising a pivot shaft having a shape. The pivot bearing mechanism includes a pivot bearing formed of a recess formed on the bottom surface of the plate-like member of the impeller, and a shape corresponding to the shape of the recess formed at the apex of the protrusion of the housing. The centrifugal blood pump according to any one of claims 2 to 7 , comprising a pivot shaft. The pivot bearing mechanism includes a pivot bearing formed of a recess formed at the apex of the protrusion of the housing, and a spherical pivot shaft attached to a central opening of the plate-like member of the impeller. The centrifugal blood pump according to any one of claims 2 to 7 . The impeller includes an annular recess provided in the passage and a ring-shaped fixing member disposed on an upper surface of the plate-like member, and the recess formed on the upper surface of the plate-like member is an upper surface of the plate-like member. The centrifugal blood pump according to claim 1, wherein the centrifugal blood pump is formed by the ring-shaped fixing member. A centrifugal blood pump comprising: the centrifugal blood pump according to any one of claims 1 to 11 ; and impeller rotational torque generating means for sucking the magnetic body of the impeller and rotating the impeller. Pump device.

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