JP2015159947A - artificial heart pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably fix a cable of an artificial heart pump.SOLUTION: An artificial heart pump includes a pump part 4 for pumping blood and a cable 7 connected to the pump part 4. The pump part 4 includes a pump casing body 41 for covering an impeller 44 and a drive mechanism 45 from outside, and a cylindrical cable insertion tube 42 into which the cable 7 is inserted. The cable 7 includes a cable body 71 whose first end part is inserted into the cable insertion tube 42, a first end projection 72 that projects outside radially integrated with the cable body 71, and a fixed part 74 disposed so as to cover the cable body 71 from outside, straddling from the first end side to the second end side on the opposite side with the first end projection 72 as a reference. The fixed part 74 includes a slipping-off prevention part facing the end surface of the second end side of the first end projection 72, and an attachment part attached to the cable insertion tube 42.

Description

  The present invention relates to an artificial heart pump.

  As a medical alternative or auxiliary heart, an artificial heart pump that pumps blood like a heart is used. Such a pump is disclosed in Patent Document 1, for example. In the pump described in Patent Document 1, in order to reduce hemolysis and thrombus generated in the blood to be fed, the impeller is rotated while floating using a magnet.

JP 2012-210415A

  By the way, in such an artificial heart pump, a cable for sending drive power from a control device or the like provided outside is connected to the pump body. A part of this cable connected to the pump body side is embedded in the body together with the pump body. And it is necessary to connect with a pump main body so that it can endure continuous use for many years in a body with a pump main body.

  In particular, there is a risk that the cable may be disconnected when an external force due to a load, a change in posture (such as crouching or sitting) and vibration applied to the cable is applied to the cable embedded in the body.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an artificial heart pump capable of fixing a cable to prevent disconnection of the cable.

In order to solve the above problems, the present invention proposes the following means.
The artificial heart pump according to the first aspect of the present invention is an artificial heart pump including a pump unit that pumps blood and a cable connected to the pump unit, and the pump unit rotates about a rotation axis. An impeller that rotates, a drive mechanism that rotationally drives the impeller, a pump casing body that covers the impeller and the drive mechanism from the outside, and a cylindrical cable that is formed in the pump casing body and into which the cable is inserted An insertion pipe, the cable having a first end inserted into the cable insertion pipe, and at least a driving power for rotating the impeller to the driving mechanism, the cable main body, A first end convex portion projecting radially outward in an integrated manner, and the cable book straddling from the first end portion side to the opposite second end portion side with respect to the first end convex portion. A fixing portion disposed so as to cover from the outside, and the fixing portion is attached to the cable insertion tube and a retaining portion facing an end surface of the first end convex portion on the second end side. A mounting portion.

  According to such an artificial heart pump, it is possible to prevent the cable body from being detached from the cable insertion tube by attaching the fixing portion in a state where the cable body is inserted into the cable insertion tube. Specifically, in the fixing portion where the position relative to the cable insertion tube is fixed by the attachment portion, the retaining portion is formed so as to face the end surface on the second end portion side of the first end convex portion. The movement of the one-end convex portion toward the second end portion is suppressed and restrained by the retaining portion. Therefore, even when the cable body is bent or pulled from the outside, the first end convex portion does not move, so that the first end portion of the cable body can be prevented from coming off from the cable insertion tube. . Thereby, a cable can be fixed stably.

  Moreover, in the artificial heart pump according to another aspect of the present invention, the fixing portion has a cylindrical shape that covers the first end convex portion from the radially outer side, and the attachment portion is the cable insertion portion. By being attached to the tube, the inner peripheral surface of the cylindrical portion may be in close contact with the outer peripheral surface of the first end convex portion.

  According to such an artificial heart pump, even when the fluid flows into the fixed part placed in the body, the flowing-in fluid can be suppressed from flowing into the cable insertion tube through the fixed part. . Therefore, the sealing performance can be improved, and the fluid can be prevented from flowing into the pump casing body.

  Furthermore, in the artificial heart pump according to another aspect of the present invention, the artificial heart pump has a cover portion that is in close contact with the fixing portion and the cable body and covers from the outside, and the cover portion is made of a flexible material. The cable main body may be arranged from the second end side to the first end side with respect to the retaining portion.

  According to such an artificial heart pump, it is possible to prevent the cable body extending from the fixed portion to the second end side from being bent at a steep angle. Specifically, the cover portion is formed in close contact with the cable main body extending from the fixed portion toward the second end side, so that the deformation of the cable main body is inhibited and the cable main body is bent. Can be suppressed. That is, it is possible to suppress a deformation that is abruptly bent and a load is applied to a portion of the cable body that is connected to the pump portion and whose movement is restricted. Thereby, it is possible to suppress the occurrence of bending that damages the cable body.

  Furthermore, in the artificial heart pump according to another aspect of the present invention, the cover portion may be formed so as to be reduced in diameter toward the second end portion side.

  According to such an artificial heart pump, it is possible to prevent the cable body extending from the cover portion to the second end side from bending at a steep angle. Specifically, the diameter of the cover portion is reduced toward the second end portion, so that the rigidity of the cover portion is reduced toward the second end portion side. Therefore, when a load that causes the cable main body to be bent is generated on the second end side of the cover portion, the cover portion is bent simultaneously with the cable main body. Therefore, it can suppress that only a cable main body bends suddenly in the exit by the side of the 2nd end part of a cover part. Thereby, it is possible to more effectively suppress the occurrence of bending that damages the cable body.

  In the artificial heart pump according to another aspect of the present invention, the artificial heart pump includes a controller unit that is disposed outside the pump unit and sends at least driving power to the pump unit via the cable, and the controller unit includes the cable body. A controller main body that sends a signal for controlling the drive mechanism via the tube, and a cylindrical controller cable insertion tube that is formed in the controller main body and into which the second end of the cable main body is inserted, and The cable is based on the second end convex portion, a second end convex portion that is integral with the cable body and protrudes radially outward on the second end portion side than the first end convex portion. A controller fixing portion that is arranged so as to cover the cable main body from the outside across the second end portion side to the first end portion side, and the controller fixing portion The a second first end side end face of the end projection and the opposing controller retaining portion, and wherein the controller cable insertion tube controller mounting portion attached to, may have.

  According to such an artificial heart pump, the cable main body is inserted into the controller cable insertion tube, and the controller fixing portion is attached to the controller cable insertion tube via the attachment portion. The movement of the portion toward the first end portion can be restricted. Therefore, even if the cable body is bent or pulled from the outside, the second end protrusion does not move, preventing the second end of the cable body from coming out of the controller cable insertion tube. it can. Thereby, a cable can be stably fixed with respect to a controller part.

  According to the artificial heart pump of the present invention, the movement of the cable is restricted by the fixing portion, the cable can be prevented from being disconnected, and the cable can be fixed more stably.

It is a simplified diagram explaining an artificial heart pump in an embodiment of the present invention. It is a mimetic diagram showing typically the composition of the artificial heart pump in the embodiment of the present invention. It is a figure which shows the artificial heart pump of this invention, Comprising: It is sectional drawing at the time of seeing in the cross section containing the rotating shaft line of an impeller. It is a principal part cross-sectional enlarged view of the cable insertion pipe periphery in the artificial heart pump of this invention.

Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIGS. 1 and 2, the artificial heart pump 1 of the present embodiment is used to help a part of the function of the heart (living body) H <b> 1 and maintain an effective circulating blood volume required by the whole body. is there. The artificial heart pump 1 is applied to, for example, a left ventricular assist artificial heart that helps a part of the function of the left ventricle H2. The artificial heart pump 1 according to the present embodiment includes a blood removal vessel 2, a blood supply tube 3, a pump unit 4, a controller unit 5, and a battery unit 6. Further, the artificial heart pump 1 includes a main cable 7 that connects the pump unit 4 and the controller unit 5 and a power cable 8 that connects the battery unit 6 and the controller unit 5 as cables.

The blood removal vessel 2 guides blood from the left ventricle H2 of the heart H1 to the pump unit 4. The blood removal vessel 2 has one end attached to the left ventricle H2 and the other end connected to the pump unit 4.
The blood supply tube 3 guides the blood sent out by the pump unit 4 to the aorta H3. One end of the blood supply tube 3 is connected to the pump unit 4, and the other end is attached to the aorta H3.
In addition, a well-known structure can be used as a structure of the blood removal vessel 2 and the blood sending tube 3, and it is not specifically limited.

The pump unit 4 pumps the blood taken in from the blood removal vessel 2 through the blood feeding tube 3 so that the blood is pumped. The pump unit 4 of this embodiment receives a control signal and driving power from the controller unit 5. As shown in FIG. 3, the pump unit 4 includes a cylindrical pump casing main body 41, a cable insertion pipe 42 formed integrally with the pump casing main body 41, and a shroud 43 accommodated in the pump casing main body 41. , An impeller 44 that is housed in the shroud 43 and rotates together with the shroud 43, and a drive mechanism 45 that rotationally drives the shroud 43 and the impeller 44.
In addition, pure titanium metal or a titanium alloy is employ | adopted as components which have parts in contact with blood, such as the pump casing main body 41, the shroud 43, and the impeller 44, as a material which has biocompatibility.

  The pump casing main body 41 has a cylindrical shape centering on the axis CL so as to cover the shroud 43, the impeller 44, and the drive mechanism 45 from the outside. The pump casing main body 41 has a blood channel 41a having a circular cross section perpendicular to the axis CL. In the pump casing main body 41, the blood removal tube 2 is connected to the upstream side (right side in FIG. 3) of the blood flow path 41a, and the blood feed tube 3 is connected to the downstream side (left side in FIG. 3).

  The cable insertion tube 42 is formed integrally with the pump casing main body 41 and connects the main cable 7 and the pump unit 4 by inserting the main cable 7. The cable insertion tube 42 has a cylindrical shape and is disposed so as to protrude from the outer peripheral surface of the pump casing body 41 in an inclined manner. Specifically, the cable insertion pipe 42 is disposed obliquely so that one end is connected to the outer peripheral surface of the pump casing main body 41 and the other end is away from the outer peripheral surface of the pump casing main body 41 as it goes downstream. . The main cable 7 is inserted into the cable insertion pipe 42 from the opening on the side not fixed to the pump casing main body 41. The cable insertion tube 42 has a male screw portion 42a in which a spiral groove is formed on the outer peripheral surface on the opening side.

  The shroud 43 is an annular part that holds the impeller 44 inside. The shroud 43 is disposed coaxially with the axis CL in the blood flow path 41 a and is held rotatably with respect to the pump casing main body 41. The shroud 43 is formed with a tubular housing groove for housing a permanent magnet 45a described later.

  The impeller 44 is provided with a rotation shaft coaxially with the axis CL of the pump casing main body 41, and rotates together with the shroud 43 in the blood flow path 41a, thereby pumping blood flowing from the upstream side toward the downstream side. doing. The impeller 44 of the present embodiment includes a nose cone 44a having a two-stage tapered shape toward the upstream side of the blood channel 41a, and a plurality of moving blades 44b integrally provided around the nose cone 44a. Have.

  The drive mechanism 45 is built in the shroud 43 and has a permanent magnet 45a in which N poles and S poles are alternately arranged in the circumferential direction, and a coil arranged in a coaxial position in the pump casing body 41 so as to cover the shroud 43 from the surroundings. 45c and a rotating magnetic field generator 45b composed of a magnetic circuit 45d.

  A control signal and driving power are sent to the rotating magnetic field generator 45b via the main cable 7, and it is possible to generate a rotating magnetic field by receiving power supply. The shroud 43 and the impeller 44 can be rotated by receiving the magnetic force and causing the permanent magnet 45a to rotate around the axis CL in synchronization with the rotating magnetic field. Further, since the permanent magnet 45a and the rotating magnetic field generator 45b are covered with a component made of pure titanium metal or titanium alloy, the portion in contact with blood has biocompatibility.

  The controller unit 5 controls the driving of the pump unit 4, that is, the flow rate of blood sent to the aorta H <b> 3 by the pump unit 4. The controller unit 5 is supplied with driving power from the battery unit 6. As shown in FIG. 2, the controller unit 5 of the present embodiment includes a controller main body 51 and a controller cable insertion tube 52 that is integrally formed on the exterior of the controller main body 51.

  The controller main body 51 outputs a control signal for controlling the driving of the pump unit 4. Further, the controller main body 51 supplies driving power supplied from the battery unit 6 to the pump unit 4.

  The controller cable insertion tube 52 is integrally formed on the exterior of the controller main body 51, and connects the main cable 7 and the controller unit 5 by inserting the main cable 7. The controller cable insertion tube 52 has a cylindrical shape like the cable insertion tube 42. The controller cable insertion tube 52 is disposed so as to protrude from the exterior of the controller main body 51. The controller cable insertion tube 52 is inserted with the main cable 7 from the opening on the side not connected to the exterior of the controller main body 51. Similarly to the cable insertion tube 42, the controller cable insertion tube 52 has a male screw portion in which a spiral groove is formed on the outer peripheral surface on the opening side.

  The battery unit 6 supplies driving power used for driving the pump unit 4 and the controller unit 5. As shown in FIGS. 1 and 2, the battery unit 6 supplies driving power to the controller unit 5 through the power cable 8, and supplies driving power to the pump unit 4 through the controller unit 5 through the main cable 7. The battery part 6 of this embodiment is comprised from a rechargeable rechargeable battery, and two are arrange | positioned. The battery unit 6 is connected to the controller unit 5 by different power cables 8. In addition, the battery part 6 can use a well-known rechargeable battery, and is not specifically limited.

  The main cable 7 is connected to the pump unit 4 and the controller unit 5. As shown in FIG. 2, the main cable 7 of the present embodiment includes a cable main body 71 that sends a control signal and the like to the drive mechanism 45 to rotate the impeller 44, and an end portion on the side connected to the pump unit 4. A first projecting portion 72 that projects integrally with the cable body 71 and projects radially outward, and a second projecting projecting radially outward by integrating with the cable body 71 at the end connected to the controller unit 5. And an end protrusion 73.

  In addition, the main cable 7 of the present embodiment is arranged on the first end side which is one end of the cable body 71 and fixed to the cable insertion tube 42, and the other side of the cable body 71. A controller fixing portion 75 that is disposed on the second end side, which is the end portion of the cable, and is fixed to the controller cable insertion tube 52, and a cover portion 76 that covers the fixing portion 74 and the cable body 71 from the outside on the pump portion 4 side. Have. In the present embodiment, the end of the cable body 71 that is inserted into the cable insertion tube 42 is the first end, and the end of the cable body 71 that is inserted into the controller cable insertion tube 52 is the second end. The end.

  The cable main body 71 is a signal line that sends a control signal and driving power for rotating the impeller 44 from the controller unit 5 to the driving mechanism 45 by being connected to the controller unit 5 and the pump unit 4. The cable body 71 of the present embodiment includes a plurality of core wires 71a formed of a conductor for sending a signal, and an insulating tube 71b that covers the core wire 71a. The insulating tube 71b is made of polyurethane, which is a biocompatible material, and has high flexibility.

  The first end protrusion 72 protrudes radially outward from the outer peripheral surface on the first end side of the cable body 71. The first end convex portion 72 of the present embodiment is formed in an annular shape on the outer peripheral surface of the cable body 71. Specifically, the first end convex portion 72 is formed so as to protrude from the outer peripheral surface of the cable body 71 over the entire circumference so as to have a diameter approximately equal to the outer diameter of the cable insertion tube 42. Moreover, the 1st end convex part 72 is formed with the polyurethane similarly to the insulating tube 71b.

  The second end protrusion 73 protrudes radially outward from the outer peripheral surface of the cable body 71 on the second end side. The second end convex portion 73 has the same shape as the first end convex portion 72 and is formed closer to the second end portion than the first end convex portion 72. Specifically, the second end convex portion 73 of the present embodiment is formed so as to protrude from the outer peripheral surface of the cable main body 71 so as to have a diameter approximately equal to the outer diameter of the controller cable insertion tube 52. The second end protrusion 73 is formed in the cable body 71 at a position away from the second end by the same distance as the position where the first end protrusion 72 is formed from the first end. Similarly to the first end convex portion 72, the second end convex portion 73 is also formed of polyurethane.

  The first end convex portion 72 and the second end convex portion 73 are formed, for example, by being integrally molded at the same time when the cable body 71 is formed. The first end convex portion 72 and the second end convex portion 73 are formed integrally with the cable body 71 by molding after the cable body 71 is formed, or two semi-annular members are pasted with a solvent. It may be formed integrally with the cable body 71 by combining them.

  The fixing portion 74 is disposed at the first end portion of the cable main body 71 and is fixed to the cable insertion tube 42. The fixing portion 74 is formed of a titanium alloy that is a biocompatible material. The fixing portion 74 of the present embodiment has a cylindrical shape that covers the first end convex portion 72 from the outside in the radial direction, and an attachment portion that is attached to the cable insertion tube 42 integrally with the cylindrical portion 74a. 74b and a retaining portion 74c that restricts the movement of the first end convex portion 72 so that the cable body 71 does not come off.

  The cylindrical portion 74a has a cylindrical shape. The cylindrical portion 74 a is formed such that the diameter of the inner peripheral surface is slightly smaller than the outer diameter of the first end convex portion 72. That is, the cylindrical portion 74 a is formed so that the inner peripheral surface is in close contact with the outer peripheral surface of the first end convex portion 72 when the first end convex portion 72 is inserted inside.

  The attachment portion 74b has a cylindrical shape like the cylindrical portion 74a, and is integrally formed so as to extend to the first end portion side of the cylindrical portion 74a. The outer peripheral surface of the attachment portion 74b is formed to be smooth with the outer peripheral surface of the cylindrical portion 74a. The attachment portion 74b has an inner peripheral surface that is approximately the same size as the outer diameter of the cable insertion tube 42, and has a spiral groove formed with a female screw portion 74d. That is, the attachment portion 74b is inserted into the cable insertion tube 42 and moved toward the cable insertion tube 42 while rotating, so that a male screw portion 42a and a female screw formed on the outer periphery of the cable insertion tube 42 are provided. The portion 74d is hooked and fixed to the cable insertion tube 42.

  The retaining portion 74 c is formed so as to face the end surface of the first end convex portion 72 on the second end side. The retaining portion 74c of the present embodiment is formed to project radially inward from the end on the second end side of the cylindrical portion 74a over the entire circumference. Specifically, the retaining portion 74c has an annular shape having a hole through which the cable body 71 can be inserted at the center. When the attachment portion 74b is fixed to the cable insertion tube 42, the retaining portion 74c is located at a position where the surface facing the first end portion contacts the end surface of the first end convex portion 72 on the second end portion side. Is formed. In addition, the retaining portion 74c is formed with a corner portion R having a predetermined rounded corner at the edge of the hole portion on the second end side of the hole portion.

  The controller fixing portion 75 is disposed at the second end of the cable body 71 and is fixed to the controller cable insertion tube 52. The controller fixing portion 75 is formed of a titanium alloy that is a biocompatible material. The controller fixing portion 75 of this embodiment is disposed in the opposite direction to the fixing portion 74 on the cable insertion tube 42 side. That is, in the controller fixing portion 75 of the present embodiment, the controller cylindrical portion 75a having the same shape as the cylindrical portion 74a and the same as the mounting portion 74b are disposed on the second end side with respect to the controller cylindrical portion 75a. A controller mounting portion 75b having a shape and a controller retaining portion 75c disposed on the first end side with respect to the controller cylindrical portion 75a and having the same shape as the retaining portion 74c are provided.

  The cover portion 76 is arranged from the second end portion side to the first end portion side of the cable main body 71 with respect to the retaining portion 74 c as a reference, and the fixing portion 74 and a part of the cable main body 71 extending from the fixing portion 74. And from the outside in the radial direction. In the present embodiment, the cover portion 76 is disposed only on the first end portion side of the cable body 71. The cover portion 76 of the present embodiment is formed of silicon rubber, which is a material different from the cable body 71 among biocompatible materials, and has high flexibility. The cover portion 76 is formed so as to be in close contact with the fixing portion 74 and the cable body 71. Specifically, the cover portion 76 of the present embodiment has a cylindrical body that covers the fixing portion 74 from the outside in the radial direction, and a cover removal formed on the first end portion side of the cover body portion 76a. It has a stop portion 76b and a reduced diameter portion 76c formed on the second end side opposite to the cover retaining portion 76b via the tubular portion 74a.

  The cover main body 76a has a cylindrical shape. The cover main body portion 76a of the present embodiment is formed such that the diameter of the inner peripheral surface is slightly smaller than the outer diameter of the cylindrical portion 74a of the fixed portion 74. That is, the cover main body portion 76a is formed so that the inner peripheral surface is in close contact with the outer peripheral surface of the cylindrical portion 74a when the fixing portion 74 is inserted therein.

  The cover retaining portion 76b is formed so as to face the end surface on the first end portion side of the mounting portion 74b of the fixing portion 74. The cover retaining portion 76b of the present embodiment is formed to project radially inward from the end on the first end portion side of the cover main body portion 76a over the entire circumference. Specifically, the retaining portion 74c has an annular shape having a hole through which the cable insertion tube 42 can be inserted at the center. When the cover part 76 is attached to the fixed part 74, the cover retaining part 76b has an inner surface on the second end side of the cover retaining part 76b on the first end part side of the attaching part 74b. It forms in the position which opposes so that it may contact | abut.

  The reduced diameter portion 76c covers the cable body 71 extending from the outside from the retaining portion 74c toward the second end portion. The reduced diameter portion 76c has a predetermined length determined in advance by a bending radius required for the cable body 71 extending from the retaining portion 74c toward the second end portion. Here, the predetermined length in the present embodiment is determined by the strength of the core wire 71a of the cable body 71, the flexibility of the insulating tube 71b, and the like, and even if the cable body 71 is bent, the core wire 71a is disconnected for a long period of time. Or a bending radius that can guarantee that the insulating tube 71b is not damaged. The reduced diameter portion 76c has a conical shape formed so as to decrease in diameter toward the second end side, and a through hole in which the cable body 71 is formed slightly smaller than the diameter of the cable body 71 in the center. Is formed. That is, the reduced diameter portion 76 c is formed so that the inner peripheral surface is in close contact with the outer peripheral surface of the cable main body 71 when the cable main body 71 is inserted inside.

  The power cable 8 is a cable for supplying driving power from the two battery units 6 to the controller unit 5. A known cable is used as the power cable 8 of the present embodiment.

Next, attachment of the main cable 7 of the artificial heart pump 1 having the configuration of the present embodiment will be described.
The main cable 7 before being connected to the pump unit 4 or the controller unit 5 is covered with the cable main body 71 between the first end convex portion 72 and the second end convex portion 73 of the cable main body 71. The part 76, the fixing part 74, and the controller fixing part 75 are arranged so as to be movable in any direction on the first end side or the second end side.

  The main cable 7 is connected to the pump unit 4 in a state where the pump unit 4 is embedded in the body by being connected to the blood removal vessel 2 and the blood feeding tube 3. First, the first end portion of the cable body 71 is inserted to an appropriate position where the first end convex portion 72 contacts the end surface of the cable insertion tube 42 on the opening side of the cable insertion tube 42. The cable body 71 is electrically connected to the pump unit 4 by inserting the cable body 71 to an appropriate position with respect to the cable insertion tube 42.

  With the cable body 71 inserted to an appropriate position, the fixing portion 74 is moved toward the position where the first end convex portion 72 is disposed in the tubular portion 74a while being rotated toward the first end portion. And fixed by the mounting portion 74b. Specifically, the fixing portion 74 is moved toward the first end portion, so that the first end convex portion 72 is slightly crushed radially inward by the inner peripheral surface of the cylindrical portion 74a. In the cylindrical portion 74a, the first end convex portion 72 is inserted. Further, when the fixing portion 74 is further moved toward the one end portion side, the inner peripheral surface of the cylindrical portion 74a and the outer peripheral surface of the first end convex portion 72 are in close contact with each other in the cylindrical portion 74a. The first end protrusion 72 is pushed in. At this time, the fixing portion 74 is moved toward the first end portion while being rotated, so that the female screw portion 74d on the inner peripheral surface of the attachment portion 74b becomes the male screw portion 42a on the outer peripheral surface of the cable insertion tube 42. Can be attached to mesh with. And the fixing | fixed part 74 is fixed to the cable insertion pipe 42 in the position which the end surface by the side of the 2nd end part of the 1st end convex part 72 contact | abuts the surface which faces the 1st end part side of the retaining part 74c.

  In a state where the cable body 71 is inserted into the cable insertion tube 42 and the fixing portion 74 is attached to the cable insertion tube 42, the first end convex portion 72 is on the first end side of the cable body 71, and the cable insertion tube 42 and the retaining portion 74 c of the fixing portion 74. Specifically, the first end convex portion 72 is in close contact with the end surface on the opening side of the cable insertion tube 42 and the surface facing the first end portion side of the retaining portion 74c of the fixing portion 74. Placed in position. That is, the first end convex portion 72 has a first end convex portion 72a and an inner peripheral surface of the cylindrical portion 74a that are in close contact with the outer peripheral surface of the first end convex portion 72, and a surface facing the first end portion side of the retaining portion 74c. It arrange | positions in the position which the end surface which faces the 2nd edge part side of the one end convex part 72 contact | adhered.

  Next, in a state where the fixing portion 74 is fixed to the cable insertion tube 42, the cover portion 76 is moved toward the first end portion side, and is moved to a position where the fixing portion 74 is accommodated in the cover main body portion 76a. . Specifically, the cover main body 76a is directed toward the first end while the fixing portion 74 is inserted into the cover main body 76a by expanding the hole of the cover retaining portion 76b radially outward. Moved. Then, the fixing portion 74 is completely accommodated in the cover main body portion 76a, and the end surface on the second end side of the cover retaining portion 76b is moved to a position where it abuts the end surface on the first end portion side of the mounting portion 74b. The In this state, the cable body 71 extending from the fixed portion 74 toward the second end side is inserted into the reduced diameter portion 76c. Therefore, the cover portion 76 is in a state where the inner peripheral surface of the cover main body portion 76a and the outer peripheral surface of the cylindrical portion 74a are in close contact, and the inner peripheral surface of the reduced diameter portion 76c and the outer peripheral surface of the cable main body 71 are in close contact. It has become.

  After fixing the main cable 7 to the pump unit 4, the main cable 7 is connected to the controller unit 5 connected to the battery unit 6 and the power cable 8. Similarly to the case where the main cable 7 is inserted into the pump unit 4, the second end portion of the cable body 71 has a second end convex portion 73 on the opening side of the controller cable insertion tube 52 with respect to the controller cable insertion tube 52. It is inserted to an appropriate position that contacts the end face. The cable body 71 is electrically connected to the controller unit 5 by inserting the cable body 71 to the controller cable insertion tube 52 to an appropriate position.

  The position where the second end convex portion 73 is disposed in the controller cylindrical portion 75a while the controller fixing portion 75 is rotated toward the second end side in a state where the cable body 71 is inserted to an appropriate position. And is fixed by the controller mounting portion 75b.

  In a state where the cable body 71 is inserted into the controller cable insertion tube 52 and the controller fixing portion 75 is attached to the controller cable insertion tube 52, the second end protrusion 73 is on the second end side of the cable body 71, It is disposed between the controller cable insertion tube 52 and the controller retaining portion 75 c of the controller fixing portion 75. Specifically, the second end convex portion 73 abuts against the end surface on the opening side of the controller cable insertion tube 52 and the surface facing the second end portion side of the controller retaining portion 75c of the controller fixing portion 75, respectively. Placed in close contact with each other. That is, the second end convex portion 73 is a surface in which the inner peripheral surface of the controller cylindrical portion 75a and the outer peripheral surface of the second end convex portion 73 are in close contact, and faces the second end portion of the controller retaining portion 75c. And the end surface of the second end convex portion 73 facing the first end portion side are disposed at a close contact position.

  According to the artificial heart pump 1 as described above, the cable main body 71 is prevented from being detached from the cable insertion tube 42 by attaching the fixing portion 74 in a state where the cable main body 71 is inserted into the cable insertion tube 42. be able to. Specifically, in the fixing portion 74 whose position with respect to the cable insertion tube 42 is fixed by the attachment portion 74b, the retaining portion 74c is formed to face the end surface on the second end side of the first end convex portion 72. Yes. Therefore, the movement of the first end convex portion 72 toward the second end portion is suppressed and restrained by the retaining portion 74c. Accordingly, even when the cable body 71 is bent or pulled from the outside, the first end convex portion 72 does not move to the second end portion side, so that the first end portion of the cable body 71 is inserted into the cable. It is possible to prevent the pipe 42 from coming off. Thereby, disconnection of the main cable 7 can be prevented and the main cable 7 can be more stably fixed to the pump unit 4.

  Further, when the attachment portion 74b is attached to the cable insertion tube 42, the first end convex portion 72 is crushed by the inner peripheral surface of the cylindrical portion 74a, and the inner peripheral surface and the first end convex portion of the cylindrical portion 74a. 72 is in close contact with the outer peripheral surface. Therefore, even if fluid such as bodily fluid flows from between the hole of the retaining portion 74c and the cable body 71 into the fixing portion 74 that is indwelled in the body, the inflowing body fluid flows through the fixing portion 74. It can suppress flowing and flowing into the cable insertion tube 42. Therefore, the sealing property can be improved, and body fluid can be prevented from flowing into the pump casing body 41. Thereby, it can prevent that a bodily fluid flows into the pump part 4 and it breaks down.

  Furthermore, when the attachment portion 74b is attached to the cable insertion tube 42, the first end convex portion 72 is not only the inner peripheral surface of the tubular portion 74a but also the surface facing the first end portion side of the retaining portion 74c, The end face of the cable insertion tube 42 on the opening side also comes into contact with and closely contacts. Therefore, it is possible to suppress body fluid from flowing in between the hole portion of the retaining portion 74 c or between the inner peripheral surface of the attachment portion 74 b and the outer peripheral surface of the cable insertion tube 42. That is, the inflow of body fluid into the fixing portion 74 can be suppressed, and the sealing performance can be further improved.

  Further, the cover portion 76 made of flexible silicon rubber is in close contact with the fixing portion 74 and the cable main body 71 with the retaining portion 74c as a reference, and covers from the outside, so that the fixing portion 74 and the cable body 71 are covered from the outside. It is possible to prevent the cable body 71 extending toward the end side from bending at a steep angle. Specifically, since the cover portion 76 is formed in close contact with the cable body 71 extending from the retaining portion 74c toward the second end side, deformation of the cable body 71 is inhibited, and the retaining portion is prevented. The deformation | transformation which the cable main body 71 bends in the position immediately after coming out from the hole of the part 74c can be suppressed. Therefore, for example, when the artificial heart pump 1 is implanted in the body by surgery, the pump unit 4 or the main cable 7 is placed in an unreasonable arrangement, or a person who is implanted with the artificial heart pump 1 sits or bends after placement. Thus, even when a load is generated to bend the cable body 71 when the body position is changed, the cable body 71 can be prevented from being bent suddenly at a position immediately after coming out of the hole of the retaining portion 74c. . That is, it is possible to suppress the deformation of the cable main body 71 that is connected to the pump portion 4 and that is restricted in movement and is suddenly bent and loaded. Thereby, it is possible to suppress the occurrence of bending that damages the cable body 71.

  Further, the reduced diameter portion 76c of the cover portion 76 has a predetermined length determined in advance by a bending radius required for the cable body 71 extending from the retaining portion 74c toward the second end portion. Therefore, the cable body 71 extending from the hole portion of the retaining portion 74c can be bent with a necessary bending radius without applying an excessive load. Thereby, it is possible to effectively suppress the occurrence of bending that damages the cable body 71.

  Moreover, the diameter reduction part 76c is diameter-reduced as it goes to the 2nd edge part side, The cable main body 71 extended from the cover part 76 to the 2nd edge part side is prevented from bending at a steep angle. be able to. Specifically, since the diameter is reduced toward the second end portion, the rigidity of the reduced diameter portion 76c is reduced toward the second end portion side. Therefore, when a load that causes the cable main body 71 to be bent occurs on the second end side of the cover portion 76, the reduced diameter portion 76 c is bent at the same time as the cable main body 71. Therefore, it is possible to prevent only the cable main body 71 from bending suddenly at the outlet on the second end side of the cover portion 76. Thereby, it is possible to more effectively suppress the occurrence of bending that damages the cable body 71.

  Further, since the corner portion R is formed at the edge on the second end side of the hole portion of the retaining portion 74c, the cable body 71 extending from the retaining portion 74c toward the second end portion is bent. When the cable body 71 moves due to vibration or vibration, it can be prevented that the cable body 71 is rubbed and damaged by the edge of the hole portion of the retaining portion 74c.

  Moreover, it can suppress that the cable main body 71 remove | deviates from the controller cable insertion pipe | tube 52 by attaching the controller fixing | fixed part 75 in the state in which the cable main body 71 was inserted in the controller cable insertion pipe | tube 52. FIG. Specifically, in the controller fixing portion 75 whose position with respect to the controller cable insertion tube 52 is fixed by the controller attachment portion 75b, the controller retaining portion 75c faces the end surface of the second end convex portion 73 on the first end portion side. It is formed as follows. Therefore, the movement of the second end convex portion 73 toward the first end portion is suppressed and restricted by the controller retaining portion 75c. Accordingly, even when the cable body 71 is bent or pulled from the outside, the second end convex portion 73 does not move, so that the second end portion of the cable body 71 comes out of the controller cable insertion tube 52. Can be prevented. Thereby, the main cable 7 can be stably fixed to the controller unit 5.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations of the embodiments in the embodiments are examples, and the addition and omission of configurations are within the scope not departing from the gist of the present invention. , Substitutions, and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

  Note that the attachment structure of the attachment portion 74b and the cable insertion tube 42 is not limited to the structure in which the male screw portion 42a and the female screw portion 74d are formed as in this embodiment, and the fixing portion 74 is inserted into the cable. What is necessary is just to be able to fix with respect to the pipe | tube 42. FIG. For example, the attachment portion 74b may be bonded to the cable insertion tube 42 or fixed with a tape or the like. The same applies to the attachment structure of the controller attachment portion 75b and the controller cable insertion tube 52.

  In addition, the battery unit 6 is not limited to a rechargeable battery as in the present embodiment, and may be a DC power source that can directly supply driving power from the outside, such as a household outlet. .

  Further, the cover portion 76 is not limited to being formed of silicon rubber as in the present embodiment, and may be any material having flexibility and biocompatibility. That is, for example, it may be formed of other materials such as formed of polyurethane like the cable body 71.

  Moreover, the cover part 76 is not limited to the structure provided only with respect to the fixing | fixed part 74 by the side of a 1st end part like this embodiment. For example, the cover part 76 may be provided also on the second end side so as to cover the controller fixing part 75 attached to the controller cable insertion tube 52.

  Further, the configuration of the present invention may be used for the power supply cable 8 in the same manner as the main cable 7.

H1 ... Heart H2 ... Left ventricle H3 ... Aorta 1 ... Artificial heart pump 2 ... Devascularization 3 ... Blood supply 4 ... Pump part CL ... Axis 41 ... Pump casing body 41a ... Blood flow path 42 ... Cable insertion tube 42a ... Female screw part 43 ... shroud 44 ... impeller 44a ... nose cone 44b ... moving blade 45 ... drive mechanism 45a ... permanent magnet 45b ... rotating magnetic field generator 45c ... coil 45d ... magnetic circuit 5 ... controller section 51 ... controller body 52 ... controller cable insertion tube 6 ... Battery part 7 ... Main cable 71 ... Cable body 71a ... Core wire 71b ... Insulating tube 72 ... First end convex part 73 ... Second end convex part 74 ... Fixed part 74a ... Cylindrical part 74b ... Mounting part 74c ... Disconnection Stop part 74d ... Male thread part R ... Corner part 75 ... Controller fixing part 75 a ... Controller cylindrical part 75b ... Controller mounting part 75c ... Controller retaining part 76 ... Cover part 76a ... Cover body part 76b ... Cover retaining part 76c ... Reduced diameter part 8 ... Power cable

Claims (5)

An artificial heart pump comprising a pump unit for pumping blood and a cable connected to the pump unit,
The pump part is
An impeller that rotates about a rotation axis;
A drive mechanism for rotating the impeller;
A pump casing body that covers the impeller and the drive mechanism from the outside;
A cylindrical cable insertion tube formed in the pump casing body and into which the cable is inserted;
The cable is
A cable main body having a first end inserted into the cable insertion tube and sending at least driving power for rotating the impeller to the driving mechanism;
A first end convex portion projecting radially outward in one piece with the cable body;
A fixing portion arranged so as to cover the cable main body from the outside across the second end portion on the opposite side from the first end portion side with respect to the first end convex portion;
The fixing part is
A retaining portion facing the end surface on the second end side of the first end convex portion,
An artificial heart pump having an attachment portion attached to the cable insertion tube. The fixed part has a cylindrical part that forms a cylindrical shape and covers the first end convex part from the radially outer side,
The artificial heart pump according to claim 1, wherein the attachment portion is attached to the cable insertion tube so that an inner peripheral surface of the cylindrical portion is in close contact with an outer peripheral surface of the first end convex portion. A cover portion that is in close contact with the fixing portion and the cable body and covers from the outside;
The said cover part is comprised with the material which has flexibility, and is arrange | positioned ranging from the 2nd edge part side of the said cable main body to the said 1st edge part side on the basis of the said retaining part. Item 3. The artificial heart pump according to Item 2.   The artificial heart pump according to claim 3, wherein the cover portion is formed so as to be reduced in diameter toward the second end portion side. A controller unit disposed outside the pump unit and sending a control signal to the pump unit via the cable;
The controller unit is
A controller body that sends at least driving power to the drive mechanism via the cable body;
A cylindrical controller cable insertion tube formed in the controller body and into which the second end of the cable body is inserted;
The cable is
On the second end side with respect to the first end convex portion, a second end convex portion that protrudes radially outward integrally with the cable body;
A controller fixing portion disposed so as to cover the cable body from the outside across the second end side from the second end side with respect to the second end convex portion;
The controller fixing part is
A controller retaining portion facing the end surface on the first end portion side of the second end convex portion;
The artificial heart pump according to any one of claims 1 to 4, further comprising a controller attachment portion attached to the controller cable insertion tube.

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