JP2005348996A - Artificial heart pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial heart pump which is embedded in the body of a person to be fitted, can prevent the generation of thrombus or hemolysis from occurring, and can safely be used over a long perid of time. <P>SOLUTION: This artificial heart pump has a housing 1, a fixing shaft 2 which is fixed in the housing 1, a rotator 3 which is arranged in the housing 1, and a driving device 4 which rotates and drives the rotator 3. On the inner peripheral surface 121 of a downstream side housing 12, a female thread-like spiral groove 51 of the same pivoting direction as a left screw as an axial streaming motion section is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an artificial heart pump.

  Conventionally, an artificial heart pump that pumps blood by rotating an impeller has been used as an alternative heart or auxiliary heart for medical use. FIG. 14 shows an axial sectional view of a conventional artificial heart pump. The artificial heart pump H has a housing 91, a fixed shaft 92 fixed in the housing 91, a rotating body 93 disposed inside the housing, and a drive device 94 that drives the rotating body 93. .

  The housing 91 has an upstream housing 911 and a downstream housing 912. The upstream housing 911 and the downstream housing 912 are fitted on the same central axis and are integrally fixed by a joining method such as welding. . The upstream housing 911 has a suction port 913 that opens in the axial direction, and a discharge port 914 that penetrates to the outside on the side peripheral portion of the downstream housing 912. The downstream housing 912 is formed with a flat surface 915 that is closed at the end opposite to the side that fits with the upstream housing 911. The discharge part 914 is formed at a position facing an opening in a space surrounded by an impeller 931 and a shroud 932 which will be described later. The fixed shaft 92 is erected and fixed to the central portion of the closed flat surface 915 of the downstream housing 912 on the same central axis as the central axis of the downstream housing 912 toward the inside of the downstream housing 912.

  The rotating body 93 includes an impeller 931, a shroud 932 disposed so as to sandwich the impeller 931, and a through hole 933 in the center. The rotating body 93 is disposed inside the housing 91 on the same central axis as the housing 91, and the fixed shaft 92 passes through the through hole 933. The outer peripheral surface 934 of the rotating body 93 and the inner peripheral surface 916 of the downstream housing 912 form a first gap 961, and the inner peripheral surface 935 of the through hole 933 of the rotating body 93 and the outer peripheral surface 921 of the fixed shaft 92 are A second gap 962 is formed. A third gap 963 is also formed between the back surface 936 of the rotating body 93 and the flat portion 915 of the downstream housing 912. The shroud 932 has an L-shaped curved shape. A space surrounded by the impeller 931 and the shroud 932 communicates with the suction port 913.

  The drive device 94 includes an electromagnet 941 disposed at equal central angular intervals inside the wall surface of the downstream housing 912, and a permanent magnet 942 embedded in the rotating body 93 at a position facing the electromagnet 941. . The plurality of electromagnets 941 can generate a rotating magnetic field when energized, and the rotating body 93 rotates when the permanent magnet 942 is synchronized.

  The artificial heart pump H pumps blood taken in from the suction port 913 by rotating a rotating body 93 by a driving device 94. As the impeller 931 rotates, the blood in the space surrounded by the impeller 931 and the shroud 932 moves to the outer peripheral side of the rotating body 93 along the shroud 932 by centrifugal force. At this time, since the pressure in the portion near the center of the space surrounded by the impeller 931 and the shroud 932 decreases, blood flows from the suction port 913 into the space surrounded by the impeller 931 and the shroud 932. Further, blood with high pressure on the outer peripheral side is discharged to the outside from the discharge port 914.

Blood flows into the first gap 961, the second gap 962, and the third gap 963, and the blood acts as a lubricant, so that the rotating body 93 is not in contact with the housing 91 and the fixed shaft 92. Arranged to be rotatable. The first gap 961, the second gap 962, and the third gap 963 are connected to each other and are formed so that blood can flow.
JP 2003-205030 A JP 2003-260128 A JP 2003-24434 A

  However, when the artificial heart pump H is driven, blood flowing into the first gap 961, the second gap 962, and the third gap 963 does not pass through the first gap 961 and the second gap 962. It flows slightly due to the pressure difference, but the flowing force is weak and blood stagnation occurs. The blood clots at the place where the flow stays, so-called thrombus.

  When the thrombus occurs, the operation of the rotating body 93 is deteriorated and the ability of the artificial heart pump H to pump blood is reduced. Moreover, complications may be caused by the occurrence of the thrombus. In addition, if the blood staying in the first gap 961, the second gap 962, and the third gap 963 is continuously stirred in the same direction, hemolysis that destroys blood particles occurs, and the artificial heart pump H is attached. May harm the health of the wearer.

  Accordingly, an object of the present invention is to provide an artificial heart pump that is implanted in the body of a wearer and that can be used safely for a long period of time by preventing thrombus generation and hemolysis.

In order to achieve the above object, the present invention provides a housing in which an opening is formed at one end in the axial direction and a closed plane is formed at the other end, and the housing is erected and fixed inward at the center of the plane of the housing. A rotating shaft having an impeller accommodated in the housing, and a driving device that rotationally drives the rotating body around the fixed shaft, and the impeller rotates to pump blood. In the artificial heart pump, the rotating body has a through-hole through which the fixed shaft passes in a central portion, and a first gap is formed between an outer peripheral surface of the rotating body and an inner peripheral surface of the housing. A second gap is formed between the inner peripheral surface of the through hole and the outer peripheral surface of the fixed shaft, and the first gap and the second gap are formed between the plane of the housing and the rotating body. Communicated through a third gap between each of the gaps Liquid is flowing in, and the rotating body is rotated in a non-contact state with respect to the housing and the fixed shaft by the blood in the gap, and is disposed in at least one of the first gap and the second gap. Is characterized in that it is provided with an axial flow section for flowing the blood in the gap in the axial direction by the rotation of the rotating body.
I will provide a.

  According to this configuration, blood in the gap between the rotating body having the impeller and the housing and between the through hole provided in the rotating body and the fixed shaft can be forcibly circulated. As a result, stagnation of blood in the gap between the rotating body and the housing and in the gap between the rotating body and the fixed shaft can be suppressed. By suppressing stagnation of blood, it is possible to prevent the stagnation of blood from coagulating and becoming a thrombus.

  Further, when the rotating body rotates, the rotating body rotates between the housing and the fixed shaft in a non-contact state, so that wear of each member generated by contact of each member and blood There is no hemolysis that can be destroyed. From the above, it can be used safely for a long time.

  The axial flow portion formed in the first gap having the above-described configuration is formed on the inner peripheral surface of the housing, and the spiral thread groove in the swivel direction in which blood flows from the opening side to the plane side by the rotation of the rotating body. It may be a spiral groove having a male thread shape in a turning direction in which blood flows from the opening side to the plane side by the rotation of the rotating body formed on the outer peripheral surface of the rotating body. In addition, these spiral grooves are not limited to a single line, and may be a multiple line. In the following description, all the descriptions regarding the spiral groove are the same, and are simply described as a spiral groove.

  Further, the axial flow portion formed in the first gap has a female screw-like spiral groove on the inner peripheral surface of the housing and a male screw-like spiral groove on the outer peripheral surface of the rotating body at the same time. May be. At this time, the spiral direction of each spiral groove is the same, and it is preferable that the spiral direction is that the blood in the first gap flows from the opening side to the plane side when the rotating body rotates.

  According to this configuration, the first gap is disposed in the high-pressure portion of the artificial heart pump, and the opening side is at a high pressure. Therefore, the axial flow portion causes the blood to flow in a direction in which blood tends to flow due to pressure. Since it sends, blood can be sent efficiently. Moreover, stagnation of blood can be prevented by simply performing a simple process on the inner peripheral surface of the housing and / or the outer peripheral surface of the rotating body. By preventing the stagnation of the blood, it is possible to prevent thrombus from occurring inside the artificial heart pump.

  In the above configuration, the axial flow portion formed in the second gap is formed on the inner peripheral surface of the through hole, and the internal thread-like spiral in the swivel direction in which blood flows from the plane side to the opening side by the rotation of the rotating body It may be a groove, or may be a spiral groove with a male thread shape in a turning direction in which blood flows from the flat surface side to the opening side by rotation of the rotating body formed on the outer peripheral surface of the fixed shaft.

  In addition, the shaft flow portion formed in the second gap simultaneously has a female threaded spiral groove on the inner peripheral surface of the through hole of the rotating body and a male threaded spiral groove on the outer peripheral surface of the fixed shaft. It may be what you are doing. At this time, the spiral direction of each spiral groove is the same, and when the rotating body rotates, the spiral direction in which the blood in the second gap flows from the plane side to the opening side is preferable.

  According to this configuration, the second gap is disposed in the low pressure portion of the artificial heart pump, and the opening side is at a low pressure. Therefore, the axial flow portion causes the blood to flow in a direction in which blood tends to flow due to the pressure. Since it sends, blood can be sent efficiently. Moreover, stagnation of blood can be prevented by simply performing a simple process on the inner peripheral surface of the through hole and / or the outer peripheral surface of the fixed shaft. By preventing the stagnation of the blood, it is possible to prevent thrombus from occurring inside the artificial heart pump.

  In the above configuration, the spiral groove of the axial flow portion formed in the second gap is formed at the axial center portion of the second gap, or at least of both axial ends of the second gap. Examples thereof include those formed at one end and those having a portion where the spiral groove is not formed.

ADVANTAGE OF THE INVENTION According to this invention, it is an artificial heart pump embedded in a to-be-weared person's body, Comprising: While preventing hemolysis by a drive, the artificial heart pump which can prevent that a thrombus generate | occur | produces inside can be provided.

  The best embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an example of an artificial heart pump according to the present invention, and FIGS. 2A to 2C are side views of components of the artificial heart pump according to the present invention. An artificial heart pump A shown in FIG. 1 includes a housing 1, a fixed shaft 2 fixed inside the housing 1, a rotating body 3 disposed inside the housing 1, and a driving device 4 that rotationally drives the rotating body 3. Have.

  The housing 1 has an upstream housing 11 and a downstream housing 12, and the upstream housing 11 and the downstream housing 12 are fitted side by side on the same central axis and fixed together by a joining method such as welding. Is done. FIG. 2A shows an exploded sectional view of the housing. The inner peripheral surface 121 of the downstream housing 12 is formed with a female thread-like spiral groove 51 in the same turning direction as the left-hand thread as an axial flow portion.

  The upstream housing 11 has a suction port 111 opened in the axial direction. A closed flat surface 122 is formed on the opposite side of the downstream housing 12 to the side on which the upstream housing 11 is fitted. In addition, a discharge port 123 penetrating to the outside is provided in a side peripheral portion of the downstream housing 12. The discharge part 123 is formed at a position facing an opening of a space 34 surrounded by an impeller 31 and a shroud 2 described later.

  FIG. 2B shows a side view of the fixed shaft. The fixed shaft 2 has a shaft main body portion 21 and a tip end portion 22 formed in a curved surface shape. The shaft main body 21 is erected and fixed perpendicularly to the plane 122 at the center of the plane 122 of the downstream housing 12. Since the distal end portion 22 is formed in a curved shape, it is possible to reduce resistance when blood flows from the suction port 111.

  FIG. 2C shows a cross-sectional view of the rotating body provided in the artificial heart pump shown in FIG. The rotating body 3 includes an impeller 31, a shroud 32 disposed so as to sandwich the impeller 31, and a through hole 33 in the center. The rotating body 3 is disposed on the same central axis as the housing 3 inside the housing 1, and the fixed shaft 2 passes through the through hole 33. The shroud 32 has an L-shaped curved shape. A space 34 surrounded by the impeller 31 and the shroud 32 is connected to the suction port 111 and the discharge port 123.

  The drive device 4 includes an electromagnet 41 arranged at equal central angular intervals inside the wall surface of the downstream housing 12 and a permanent magnet 42 embedded in the rotating body 3 at a position facing the electromagnet 41. . The plurality of electromagnets 41 can generate a rotating magnetic field when energized, and the rotating body 3 rotates when the permanent magnets 42 are synchronized.

  The artificial heart pump A pumps blood taken from the suction port 111 when the rotating body 3 is rotated by the driving device 4. The rotating body 3 is not limited to this, but here, it is assumed that the upper part in the drawing rotates forward. As the impeller 31 rotates, the blood in the space 34 surrounded by the impeller 31 and the shroud 32 moves along the shroud 32 to the outer peripheral side of the space 34 by centrifugal force. At this time, the pressure is reduced in a portion near the center of the space 34 surrounded by the impeller 31 and the shroud 32. A space 34 surrounded by the impeller 31 and the shroud 32 has an opening facing the suction port 111, and blood flows into the space 34 surrounded by the impeller 31 and the shroud 32 from the suction port 111. Further, blood with high pressure on the outer peripheral side is discharged to the outside from the discharge port 123.

  The outer peripheral surface 35 of the rotating body 3 and the inner peripheral surface 121 of the downstream housing 12 form a first gap 61, and the inner peripheral surface 331 of the through hole 33 of the rotating body 3 and the shaft main body 21 of the fixed shaft 2. The outer peripheral surface 211 forms a second gap 62. A third gap 63 is formed between the axial rear surface 36 of the rotating body 3 and the flat surface portion 122 of the downstream housing 12.

  The first gap 61 is disposed at a position near the outer periphery, and the second gap 62 is disposed at a position near the center. Thus, when the rotating body 3 is rotating, the first gap 61 has a higher static pressure than the second gap 62, and blood passes from the first gap 61 through the third gap 63 due to the pressure difference. Flow into the second gap 62. Further, the blood flowing into the first gap 61 rotates around the axis inside the first gap 61 as the rotating body 3 rotates.

  As shown in FIG. 2A, the downstream housing 12 is formed with a spiral groove 51 having the same turning direction as the left-hand screw. Since the blood flows around the axis in the first gap 61, the blood flows along the spiral groove 51. As a result, the blood is pushed by the spiral groove 51 and flows from the left side to the right side in the first gap 61 in the drawing.

  The first gap 61, the second gap 62, and the third gap 63 are caused by the force of the blood to flow along the spiral groove 51 and the pressure difference between the first gap 61 and the second gap 62. The blood inside always flows from the first gap 61 to the second gap 62 through the third gap 63. The blood that has flowed into the second gap 62 flows into the space 34 through the gap between the tip 22 of the fixed shaft 2 and the shroud 32.

  Further, new blood flows into the first gap 61 through the gap between the shroud 32 and the downstream housing 12. Thereby, since blood flow is constantly generated in the first gap 61, the second gap 62, and the third gap 63, the occurrence of blood stagnation in the gap between the housing 1 and the rotating body 3 is suppressed, Thrombus generation can be prevented.

  FIG. 3 shows a cross-sectional view of another example of the artificial heart pump according to the present invention. FIG. 4 shows a front view of a rotating body used in the artificial heart pump shown in FIG. The artificial heart pump B shown in FIG. 3 has the same structure as that of the artificial heart pump A shown in FIG. 1 except that the shapes of the housing 1b and the rotating body 3b are different. It is. The rotating body 3b is not limited to this, but the upper part of the drawing rotates to the front.

  No internal thread-like spiral groove is formed on the inner peripheral surface 121b of the downstream housing 12b of the artificial heart pump B shown in FIG. Also, as shown in FIG. 4, a male thread-like spiral groove 52 is formed on the outer peripheral surface 35b of the rotating body 3b as an axial flow portion in the same turning direction as the left-hand screw.

  By rotating the rotating body 3b with the driving device 4, the blood in the first gap 61 is pushed toward the third gap 63 side by the spiral groove 52 of the rotating body 3b. The blood in the gap between the housing 1b and the rotating body 3b always flows due to the blood flow generated by the spiral groove 52 pushing the blood and the blood flow due to the pressure difference between the first gap 61 and the second gap 62. Since the blood flows out of the gap between the tip 22 of the gap 62 and the shroud 32 and new blood always flows into the gap 61, 62, 63, blood stagnation does not occur and thrombus formation can be prevented. it can.

  The artificial heart pump B shown in FIG. 3 exemplifies a pump in which a spiral groove is not formed on the inner peripheral surface 121b of the housing 1 (downstream housing 12b). Good. At this time, the turning direction may be the same as the spiral groove 52 formed in the rotating body 3b (the spiral groove 51 shown in FIG. 2A).

  FIG. 5 shows a cross-sectional view of still another example of the artificial heart pump according to the present invention. FIG. 6 shows a cross-sectional view of a rotating body used in the artificial heart pump shown in FIG. The artificial heart pump C shown in FIG. 5 has the same configuration as the artificial heart pump B shown in FIG. 3 except that the shape of the rotating body 3c is different, and substantially the same parts are denoted by the same reference numerals. is there. The rotational direction of the rotating body 3c is not limited to this, but the upper part of the drawing is assumed to rotate forward.

  The rotating body 3c shown in FIG.5 and FIG.6 has the internal thread-like spiral groove 53 which has the same turning direction as a right screw as an axial flow part in the center part of the through-hole 33c. As the rotator 3c rotates, the blood in the second gap 62 moves along the spiral groove 52 of the rotator 3c. At this time, since the spiral groove 53 has the same turning direction as that of the right screw, the blood in the second gap 62 flows from the plane 122 side toward the suction port 111 side.

  Thus, the blood in the second gap 62 flows out from between the tip 21 and the shroud 32c toward the space 34c by the rotation of the rotating body 3c. This further increases the pressure difference between the first gap 61 and the second gap 62, and the blood in the first gap 61 flows into the second gap 62 through the third gap 63 and flows out to the outside. . At this time, since new blood flows into the first gap 61, the blood always circulates through the first gap 61, the second gap 62, and the third gap 63. Thereby, it is possible to suppress the occurrence of blood stagnation in each of the gaps 61, 62, and 63, and to prevent the generation of thrombus. In addition, in the second gap 62 formed by the fixed shaft 2 and the through hole 33c of the rotating body 3c, the spiral groove 53 is not formed at both ends in the axial direction, so that the rotating body 3c rotates stably. It is possible.

  FIG. 7 shows a cross-sectional view of another example of a rotating body used in the artificial heart pump shown in FIG. The rotating body 3d shown in FIG. 7 includes female threaded spiral grooves 54a and 54b in the same turning direction as the right-hand thread as axial flow portions at both ends of the through hole 33d. By providing the spiral grooves 54a and 54b, the blood in the second gap 62 flows from the plane 122 side toward the suction port 111 side along the spiral grooves 54a and 54b when the rotating body 3d rotates. As for the rotation direction of the rotating body 3d, the upper part in the figure is rotated forward.

  Thus, the blood in the second gap 62 flows out from between the tip 22 and the shroud 32 by the rotation of the rotating body 3d. Thereby, the pressure difference between the first gap 61 and the second gap 62 is further increased. The blood in the first gap 61 flows into the second gap 62 through the third gap 63 due to the pressure difference. Since new blood flows into the first gap 61, blood is constantly circulating in the gaps 61, 62, and 63. Thereby, it is possible to suppress the occurrence of blood stagnation in the gaps 61, 62, 63, and to prevent the generation of thrombus. In the portion where the spiral grooves 54a and 54b are not formed, the distance between the through hole 33d and the shaft main body 21 of the fixed shaft 2 can be easily kept constant, and the rotation of the rotating body 3d is stabilized accordingly.

  The rotating body 3d shown in FIG. 7 is illustrated as having the spiral grooves 54a and 54b at both ends of the through-hole 33d, but is not limited to this, and the spiral groove is provided only at one of the ends. May be formed.

  FIG. 8 is a sectional view of still another example of the artificial heart pump according to the present invention, and FIG. 9 is a front view of a fixed shaft used in the artificial heart pump shown in FIG. The artificial heart pump E shown in FIG. 8 uses the rotating body 3 shown in FIG. 2B as the rotating body, and has the same configuration as the artificial heart pump B shown in FIG. 3 except that the shape of the fixed shaft 2e is different. The fixed shaft 2e shown in FIG. 9 has a male thread-like helical groove 55 in the same turning direction as the right-hand screw as an axial flow portion at the center of the region disposed in the second gap 62 of the shaft main body 21e. The direction of rotation of the rotating body 3 is not limited to this, but the upper part of the drawing rotates to the near side.

  As the rotating body 3 rotates, the blood flowing into the second gap 62 flows around the central axis along the shaft main body 21e of the fixed shaft 2e. At this time, the blood flows from the plane 122 side to the suction port 111 side along the spiral groove 55 formed in the shaft main body portion 21e. The blood in the second gap 62 flows out between the front end portion 21e and the shroud 32. As a result, the pressure difference between the first gap 61 and the second gap 62 is further increased, and the blood in the first gap 61 flows into the second gap 62 through the third gap 63. New blood flows into the first gap 61 from which the blood has flowed out. As a result, blood constantly circulates in the first gap 61, the second gap 62, and the third gap 63, and the occurrence of stagnation of blood in each gap 61, 62, 63 is suppressed. And the generation of thrombus can be prevented.

  Since the fixed shaft 2e has portions where the spiral groove 55 is not formed at both ends of the shaft main body 21e, the distance between the through hole 33 and the shaft main body 21e can be easily kept constant. The rotation is stable.

  FIG. 10 shows a front view of another example of a fixed shaft used in the artificial heart pump shown in FIG. The rotary shaft 2f shown in FIG. 10 has a male thread-like helical groove 56 in the same turning direction as the right-hand screw as an axial flow portion at both ends of a region disposed in the second gap 62 of the shaft main body portion 21f.

  As the rotating body 3 rotates, the blood flowing into the second gap 62 flows around the central axis along the shaft main body portion 21f of the fixed shaft 2f. At this time, the blood flows from the plane 122 side to the suction port 111 side along the spiral groove 56 formed in the shaft main body portion 21f. The blood in the second gap 62 flows out between the front end portion 21f and the shroud 32. As a result, the pressure difference between the first gap 61 and the second gap 62 is further increased, and the blood in the first gap 61 flows into the second gap 62 through the third gap 63. New blood flows into the first gap 61 from which the blood has flowed out. As a result, blood constantly circulates in the first gap 61, the second gap 62, and the third gap 63, and the occurrence of stagnation of blood in each gap 61, 62, 63 is suppressed. And the generation of thrombus can be prevented.

  The shaft main body portion 21f of the fixed shaft 2f has a portion where the spiral groove 56 is not formed, can rotate the rotating body 3 stably, and has a large area where the spiral groove 56 is formed. The action of flowing blood in the gap 62 between the two is high. In the fixed shaft 2f shown in FIG. 10, the shaft main body portion 21f is illustrated in which the spiral grooves 56 are formed at both ends, but is not limited thereto, and is formed in either one of them. It may be.

  The artificial heart pumps shown in FIGS. 5 and 8 exemplify those in which a spiral groove is formed in only one of the rotating body and the fixed shaft, but the invention is not limited to this, and a spiral groove is formed in both. It may be. At this time, the turning direction of the spiral groove formed in the rotating body and the fixed shaft is the same direction (here, the same turning direction as that of the right screw).

  In the artificial heart pump C shown in FIG. 5 and the artificial heart pump E shown in FIG. 8, a spiral groove may be formed on the inner peripheral surface of the housing. At this time, the spiral groove formed on the inner peripheral surface of the housing is in the direction of the spiral groove formed on the inner peripheral surface of the through hole of the rotating body or the outer peripheral surface of the fixed shaft (both in this case, the same rotation as the right screw). Direction) and a different turning direction (the same turning direction as the left-hand screw).

  FIG. 11 is a sectional view of still another example of the artificial heart pump according to the present invention, and FIGS. 12 and 13 are a front view and a sectional view of a rotating body used in the artificial heart pump shown in FIG. In the artificial heart pump G shown in FIG. 11, it is assumed that the rotating body 3 g rotates in the upper part in the drawing. As shown in FIGS. 11 and 12, a male thread-like spiral groove 52 is formed on the outer peripheral surface 35g of the rotating body 3g as an axial flow portion in the same turning direction as the left-hand screw as in the rotating body 3b shown in FIG. Yes. Further, as shown in FIGS. 11 and 13, the inner peripheral surface 331g of the through hole 33g of the rotating body 3g has a female thread-like spiral in the same turning direction as the right-hand screw as the rotating body 33c shown in FIG. A groove 53 is formed.

  As the rotating body 3g rotates in the artificial heart pump G, the blood in the first gap 61 flows from the suction port 111 side to the plane 122 side (from left to right in the figure) and into the second gap 62. The blood flows from the plane 122 side to the suction port 111 side (from right to left in the figure). The blood in the second gap 62 flows out between the tip 22 and the shroud 32g. The blood in the first gap 61 flows out of the gap from the second gap 62 through the third gap 63. At this time, since new blood flows into the first gap 61, blood always flows in the first gap 61, the second gap 62, and the third gap 63, so that blood stagnation occurs. Can be suppressed, and thrombus formation can be prevented.

  In addition, since the ability to flow blood is higher when using both of the spiral grooves 52 and 53 than when using only one of the spiral grooves 52 and 53, blood stagnation is suppressed and thrombus formation is prevented. High ability to do. Moreover, the spiral groove formed in the through-hole 331g may be formed in both ends like the helical grooves 54a and 54b shown in FIG. At this time, it may be formed only in either one.

  In each of the above-described embodiments, the blood flow direction in the first gap 61 is the plane side from the suction port side, and the blood flow direction in the second gap 62 is from the plane side to the suction port side. It is not limited. However, since the first gap 61 has a higher pressure than the second gap 62, it is more efficient and preferable that blood flows in the above-described direction.

It is sectional drawing of an example of the artificial heart pump concerning this invention. 1A is an exploded sectional view of a housing used for the artificial heart pump shown in FIG. 1, and FIG. 2B is a front view of a fixed shaft used for the artificial heart pump shown in FIG. FIG. 2 is a cross-sectional view of a rotating body used in the artificial heart pump shown in FIG. 1. It is sectional drawing of the other example of the artificial heart pump concerning this invention. It is a front view of the rotary body used for the artificial heart pump shown in FIG. It is sectional drawing of the further another example of the artificial heart pump concerning this invention. It is sectional drawing of the rotary body used for the artificial heart pump shown in FIG. It is sectional drawing of the rotary body used for the artificial heart pump shown in FIG. It is sectional drawing of the further another example of the artificial heart pump concerning this invention. It is a front view of the fixed shaft used for the artificial heart pump shown in FIG. It is a front view of the other example of the fixed shaft used for the artificial heart pump shown in FIG. It is sectional drawing of the further another example of the artificial heart pump concerning this invention. It is a front view of the rotary body used for the artificial heart pump shown in FIG. It is sectional drawing of the rotary body used for the artificial heart pump shown in FIG. It is sectional drawing of an example of the conventional artificial heart pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 11 Upstream housing 111 Inlet 12 Downstream housing 121 Inner peripheral surface 122 Plane 123 Discharge port 2 Fixed shaft 21 Shaft body part 22 Tip part 3 Rotating body 31 Impeller 32 Shroud 33 Through-hole 34 Space 35 Outer peripheral surface 4 Drive device 41 Electromagnet 42 Permanent magnet A, B, C, E, G Artificial heart pump

Claims (8)

A housing in which an opening is formed at one end in the axial direction and a closed plane is formed at the other end; a fixed shaft that is erected and fixed inward at the center of the plane of the housing; An artificial heart pump that has a rotating body having an impeller to be accommodated, and a driving device that rotationally drives the rotating body around the fixed axis, and pumps blood by rotating the impeller;
The rotating body has a through-hole through which the fixed shaft passes in a central portion,
A first gap is formed between the outer peripheral surface of the rotating body and the inner peripheral surface of the housing, and a second gap is formed between the inner peripheral surface of the through hole and the outer peripheral surface of the fixed shaft. The first gap and the second gap communicate with each other via a third gap between the plane of the housing and the rotating body, and blood flows into each of the gaps. It rotates in a non-contact state with respect to the housing and the fixed shaft by the blood in the gap,
An artificial heart pump characterized in that at least one of the first gap and the second gap is provided with an axial flow section for flowing blood in the gap in the axial direction by rotation of the rotating body.   The axial flow portion formed in the first gap is formed on the inner peripheral surface of the housing, and is a female thread-like spiral groove in the swivel direction in which blood flows from the opening side to the plane side by the rotation of the rotating body. The artificial heart pump according to claim 1.   The axial flow portion formed in the first gap is formed on the outer peripheral surface of the rotating body, and is a male thread-like spiral groove in a turning direction in which blood flows from the opening side to the plane side by the rotation of the rotating body. The artificial heart pump according to claim 1 or 2, characterized in that.   The axial flow portion formed in the second gap is formed in the inner peripheral surface of the through hole, and is a female thread-like spiral groove in the swivel direction in which blood flows from the plane side to the opening side by the rotation of the rotating body. The artificial heart pump according to claim 1, 2, or 3.   The axial flow portion formed in the second gap is formed in the outer peripheral surface of the fixed shaft, and is a spiral screw-shaped spiral groove in the swivel direction in which blood flows from the plane side to the opening side by the rotation of the rotating body. The artificial heart pump according to any one of claims 1 to 4, wherein the artificial heart pump is provided.   The artificial heart pump according to claim 4 or 5, wherein the spiral groove of the axial flow portion formed in the second gap is formed in a central portion in the axial direction of the second gap.   6. The spiral groove of the axial flow portion formed in the second gap is formed at at least one end portion of both axial end portions of the second gap. The described artificial heart pump.   The artificial heart pump according to any one of claims 4 to 7, wherein the axial flow portion formed in the second gap has a portion where the spiral groove is not formed.

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