JP6447089B2 - attachment - Google Patents

Description

  The present invention relates to an attachment for detachably mounting a liquid feed pump on a rotary drive device.

  In an extracorporeal blood circulation circuit using a heart-lung machine, a blood pump is used to move blood. As a blood pump, there is known a turbo blood pump that rotates an impeller (impeller) in a pump chamber and feeds blood by centrifugal force (for example, see Patent Document 1). Since the blood pump is replaced for each operation, the blood pump is detachably attached to a rotary drive device that drives the blood pump via an attachment.

  FIG. 18 is a cross-sectional view showing a state in which a turbo blood pump (hereinafter simply referred to as “pump”) 700 is attached to a rotary drive device 800 via a conventional attachment 900. An alternate long and short dash line 800 a is a central axis of the rotary drive device 800, and the central axis 800 a coincides with each central axis of the pump 700 and the attachment 900. For convenience of explanation, the direction along the central axis 800a is “up and down direction”, the direction parallel to the plane perpendicular to the central axis 800a is “horizontal direction”, and the direction orthogonal to the central axis 800a is “radial direction”. A direction rotating around the shaft 800a is referred to as a “circumferential direction”. “Upper” and “Lower” are defined in a state where the pump 700 and the rotary driving device 800 are arranged in the direction of FIG. However, “vertical direction” and “horizontal direction” do not mean the posture of the pump 700 and the rotary drive device 800 in actual use.

  The pump 700 includes a housing 710 in which an upper half 710a and a lower half 710b are joined in the vertical direction. A pump chamber 711 is formed in the housing 710. The housing 710 is formed with an inlet port 712 communicating with the upper portion of the pump chamber 711 and an outlet port 713 communicating with the side of the pump chamber 711. The inlet port 712 extends upward along the central axis 800a. The outlet port 713 extends from the outer peripheral surface of the pump chamber 711 along a tangential direction (a direction orthogonal to the radial direction). The inlet port 712 and the outlet port 713 are connected to a flexible tube (not shown) constituting an extracorporeal blood circulation circuit. For example, the inlet port 712 can be connected via a tube to the outlet port at the lower end of the blood reservoir, and the outlet port 713 can be connected via a tube to the inlet port of the oxygenator.

  In the pump chamber 711, an impeller (impeller) 720 as a rotor is disposed coaxially with the central axis 800a. The impeller 720 includes a rotating shaft 721 extending along the central axis 800a, a plurality of (in this example, six) vanes (blades) 722 connected to the rotating shaft 721 at equal angular intervals, and a plurality of vanes. And an annular connecting ring 723 that connects the outer peripheral ends of 722. The upper end of the rotation shaft 721 is rotatably supported by an upper half body 710 a constituting the housing 710, and the lower end of the rotation shaft 721 is rotatably supported by a lower half body 710 b constituting the housing 710. Thereby, the impeller 720 can rotate around the rotation shaft 721 in the pump chamber 711. In the connection ring 723, a plurality of magnets (driven magnets) 725 are incorporated at equal angular intervals with respect to the rotating shaft 721.

  The rotary drive device 800 includes a drive motor (not shown) and an upper housing 801 attached to the upper portion of the drive motor. A driving head 820 coaxial with the central axis 800a protrudes upward from an opening (through hole) 802 formed in the center of the upper housing 801. A drive shaft 821 extending downward from the drive head 820 along the central axis 800a is connected to a rotation output shaft (not shown) of the drive motor. A plurality of magnets (drive magnets) 825 are fixed on the upper surface of the drive head 820 at equal angular intervals with respect to the central axis 800a. The number of drive magnets 825 is the same as the number of driven magnets 725. A head cover 805 protruding toward the pump 700 is attached to the upper housing 801 so as to close the opening 802. The head cover 805 is separated from and covers the drive head 820.

  An attachment 900 is attached to the upper surface of the upper housing 801. The attachment 900 has an annular shape surrounding the drive head 820 and the head cover 805 (see FIG. 20 described later). The pump 700 is detachably attached to the rotation drive device 800 via the attachment 900.

  In a state where the pump 700 is attached to the attachment 900, the plurality of driven magnets 725 and the plurality of drive magnets 825 are opposed to each other via the lower half 710b and the head cover 805, and are magnetically coupled. When the drive head 820 of the rotation drive device 800 is rotated in this state, the rotation drive force is transmitted to the impeller 720 via the drive magnet 825 and the driven magnet 725, and the impeller 720 rotates around the rotation shaft 721. The blood in the pump chamber 711 is rotated by the vane 722 provided in the impeller 720 and flows out from the outlet port 713 by the centrifugal force generated thereby. As a result, the inside of the pump chamber 711 becomes negative pressure, so that blood flows into the pump chamber 711 through the inlet port 712.

  A connection structure between the attachment 900 and the pump 700 will be described.

  19A is a perspective view of the pump 700 as viewed from above, and FIG. 19B is a perspective view of the pump 700 as viewed from below. As shown in FIGS. 19A and 19B, an annular base 730 is provided at the lower end of the lower half 710 b constituting the housing 710 of the pump 700. The outer peripheral surface of the pedestal 730 is a cylindrical surface that is coaxial with the rotation shaft 721 of the impeller 720 (that is, the central shaft 800a, see FIG. 18). Twelve concave portions 731 are formed on the outer peripheral surface of the pedestal 730 at equal angular intervals (30 degree intervals) with respect to the rotation shaft 721 of the impeller 720. Each concave portion 731 has a semi-cylindrical surface extending in the vertical direction. A dummy recess 732 is formed between the recesses 731 adjacent in the circumferential direction. The shape of the dummy recess 732 is also a semi-cylindrical surface extending in the vertical direction, similar to the shape of the recess 731. However, the radius of the semi-cylindrical surface of the dummy recess 732 is smaller than that of the recess 731. Therefore, the dimension (depth) in the radial direction is also smaller in the dummy recess 732 than in the recess 731.

  A slot-like groove (concave portion) 733 is formed on the upper end of the base 730 in one-to-one correspondence with the concave portion 731. The groove 733 is cut out at a part of the upper portion of the corresponding recess 731 and is connected to the recess 731. More specifically, the groove 733 extends along the circumferential direction from the start end 733a to the end end 733b in a counterclockwise direction when viewed from above. The circumferential position of the start end 733a of the groove 733 coincides with the deepest portion (the most recessed portion in the radial direction) of the recess 731 corresponding to the groove 733. The groove 733 does not reach the recess 731 adjacent to the recess 731 corresponding to the groove 733. Both the start end 733a and the end end 733b constitute a wall surface along the radial direction and the vertical direction.

  FIG. 20 is a perspective view of the attachment 900 attached to the upper housing 801 of the rotary drive device 800 as seen from above. The attachment 900 includes an annular base ring 901 that surrounds the head cover 805. An inner peripheral surface (surface on the head cover 805 side) 902 of the base ring 901 is a cylindrical surface that is coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800. Three connecting claws 905 protrude from the inner peripheral surface 902 inward along the radial direction. The connecting claws 905 are arranged at intervals of 120 degrees. The connecting claw 905 is a thin plate-like object parallel to the horizontal surface, and the tip of the connecting claw 905 viewed from above has a semicircular shape. Further, the lock pin 910 passes through the base ring 901 in the radial direction. A groove (not shown) having a predetermined length extending in the longitudinal direction of the lock pin 910 is formed on the outer peripheral surface which is a substantially cylindrical surface of the lock pin 910. Stopper pins 919 along the direction orthogonal to the radial direction are inserted into the base ring 901. The tip of the stopper pin 919 is fitted in the groove of the lock pin 910. As a result, the lock pin 910 can move so as to approach or separate from the head cover 805 along the radial direction within the length of the groove.

  FIG. 20 shows the lock pin 910 in the position farthest from the head cover 805. This position of the lock pin 910 is referred to as “non-lock position”. When the lock pin 910 is in the unlocked position, the tip 911 of the lock pin 910 does not protrude from the inner peripheral surface 902 of the base ring 901 to the head cover 805 side.

  FIG. 21 shows the lock pin 910 in the position closest to the head cover 805. This position of the lock pin 910 is referred to as a “lock position”. When the lock pin 910 is in the locked position, the tip 911 of the lock pin 910 protrudes from the inner peripheral surface 902 of the base ring 901 to the head cover 805 side.

  In this way, the lock pin 910 is movable along the radial direction between the unlocked position (FIG. 20) and the locked position (FIG. 21). The lock pin 910 can be moved in the radial direction at an operation end (rear end) 912 of the lock pin 910 that protrudes outward from the base ring 901 along the radial direction.

  A method of attaching / detaching the pump 700 to / from the attachment 900 configured as described above will be described.

  First, as shown in FIG. 22, the pump 700 is opposed to the attachment 900. At this time, the lock pin 910 of the attachment 900 is in the unlocked position (see FIG. 20). Although not shown, a tube constituting an extracorporeal blood circulation circuit is already connected to the inlet port 712 and the outlet port 713. The rotation driving device 800 is fixed at a predetermined position by a jig (not shown).

  Next, the pump 700 is brought close to the attachment 900. The base 730 of the pump 700 is inserted into the base ring 901 of the attachment 900. The pump 700 is slightly rotated in the circumferential direction, and the connection claw 905 of the attachment 900 is fitted into the recess 731 (see FIGS. 19A and 19B) of the base 730 of the pump 700. Since the radius of the semi-cylindrical surface of the dummy recess 732 is smaller than the semicircular radius at the tip of the connection claw 905, the connection claw 905 cannot be fitted into the dummy recess 732.

  FIG. 23 is a perspective view showing a state in which the base 730 of the pump 700 is inserted into the base ring 901 of the attachment 900 to the deepest. Although not shown, the groove 733 (see FIGS. 19A and 19B) formed in the base 730 is aligned with the connecting claw 905 in the vertical direction. When the inner peripheral surface 902 of the base ring 901 and the outer peripheral surface of the pedestal 730 are fitted, the pump 700 is horizontal with respect to the attachment 700 and the rotary drive device 800 so that the impeller 720 is coaxial with the drive head 820. Is positioned. When the pump 700 is lifted upward in the state of FIG. 23, the pump 700 can be separated from the attachment 900. The lock pin 910 of the attachment 900 is still in the unlocked position (see FIG. 20). Although detailed drawings are omitted, the tip 911 of the lock pin 910 faces the dummy recess 732 (see FIGS. 19A and 19B) of the base 730.

  Next, as shown in FIG. 24, the pump 700 is rotated clockwise (arrow R7) with respect to the attachment 700 and the upper housing 801 when viewed from above. When the pump 700 rotates, the connecting claw 905 moves from the recess 731 into the groove 733 (see FIGS. 19A and 19B). The rotation of the pump 700 is restricted by the connection claw 905 colliding with the rear end 733b of the groove 733 (see FIGS. 19A and 19B). In this example, the rotatable angle range of the pump 700 is about 15 degrees. FIG. 24 shows a state in which the pump 700 is rotated until the connecting claw 905 collides with the rear end 733 b of the groove 733. Since the coupling claw 905 is fitted in the groove 733 of the base 730, the pump 700 is positioned in the vertical direction with respect to the attachment 900 and the rotary drive device 800. Therefore, the pump 700 cannot be separated from the attachment 900 even if the pump 700 is lifted upward. The lock pin 910 of the attachment 900 is still in the unlocked position (see FIG. 20). Although not shown in detail, the tip 911 of the lock pin 910 faces the recess 731 (see FIGS. 19A and 19B) of the base 730.

  Finally, as shown in FIG. 25, the operation end 912 of the lock pin 910 is pushed in along the radial direction, and the lock pin 910 is moved to the lock position (see FIG. 21). Thus, the mounting of the pump 700 to the attachment 900 is completed. When the lock pin 910 is in the lock position, the tip 911 of the lock pin 910 is fitted into the recess 731. Therefore, the pump 700 cannot be rotated with respect to the attachment 900. Further, the connecting claw 905 is fitted in a groove 733 formed in the base 730. Therefore, even if the pump 700 is lifted upward, the pump 700 and the attachment 900 cannot be separated in the vertical direction.

  18 described above is a cross-sectional view of the state shown in FIG. The driven magnet 725 of the impeller 720 approaches the drive magnet 825 of the drive head 820 and is magnetically coupled. Since the relative position of the pump 700 with respect to the rotary drive device 800 and the attachment 900 cannot change, the magnetic coupling is maintained stably. When the drive head 820 is rotated, the impeller 720 follows and rotates, and blood can flow in from the inlet port 712 and flow out from the outlet port 713.

  In order to separate the pump 700 from the attachment 900 from the state of FIG. 25, it is possible to perform the reverse operation to the above.

  That is, first, the operation end 912 of the lock pin 910 is pulled to move the lock pin 910 outward along the radial direction. The tip 911 of the lock pin 910 comes out of the recess 731. As a result, the state shown in FIG. 24 is obtained.

  Next, the pump 700 is rotated counterclockwise with respect to the attachment 700 and the upper housing 801 as viewed from above. The connecting claw 905 collides with the start end 733a of the groove 733 (see FIGS. 19A and 19B). As a result, the state shown in FIG. 23 is obtained.

  Finally, the pump 700 is lifted upward. Thereby, as shown in FIG. 22, the pump 700 and the attachment 900 can be separated.

  As described above, according to the conventional attachment 900, the pump 700 is arranged so that the impeller 720 of the pump 700 is coaxial with the drive head 820 of the rotary drive device 800 by fitting the base 730 into the base ring 901. Positioned horizontally. Next, the pump 700 is rotated, and the coupling claw 905 of the attachment 900 is fitted into the groove 733 of the base 730, whereby the pump 700 is positioned in the vertical direction. Finally, the lock pin 910 is moved to the lock position. When the lock pin 910 is fitted into the recess 731, the pump 700 is restricted from rotating with respect to the attachment 900. As long as the lock pin 910 remains in the locked position, the pump 700 does not drop out of the attachment 900 unintentionally, so that the magnetic coupling between the driven magnet 725 and the drive magnet 825 is maintained, and blood can be sent stably. can do. The lock pin 910 functions as a “lock mechanism” for maintaining the pump 700 attached to the attachment 900.

JP 2014-114784 A

  The conventional attachment 900 has the following problems.

  In order to attach the pump 700 to the attachment 900, the pedestal 730 is inserted into the base ring 901 (see FIG. 23), and then the pump 700 is rotated with respect to the attachment 900 (in the above example, approximately in the direction of the arrow R7). 15 degrees) (see FIG. 24). However, there is a problem that the tube connected to the inlet port 712 and the outlet port 713 of the pump 700 is twisted or bent by rotating the pump 700. As a result, the flow path in the tube is narrowed, and in the worst case, the flow path is blocked, and the blood flow in the tube is inhibited. In general, in order to reduce the burden on the patient, it is preferable that the capacity in the extracorporeal blood circulation circuit is small. From this viewpoint, the tubes connected to the inlet port 712 and the outlet port 713 are often shortened as much as possible. In such a case, twisting or bending of the tube due to rotation of the pump 700 becomes more remarkable.

  In the conventional attachment 900, the lock pin 910 is pushed in and moved to the lock position (see FIG. 25) to shift to a state in which the lock mechanism is effectively functioning (ie, “lock state”). The mounting to 900 is completed (see FIG. 25). However, the base 730 is simply inserted into the base ring 901 (see FIG. 23), or the pump 700 is rotated with respect to the attachment 900 and the lock pin 910 is not pushed in (see FIG. 24). ), The driven magnet 725 and the drive magnet 825 can be magnetically coupled, and the impeller 720 can be rotated following the drive head 820. Therefore, in the operation of attaching the pump 700 to the attachment 900, there is a possibility that an erroneous operation of forgetting the operation of rotating the pump 700 or the operation of pushing the lock pin 910 into the lock position may occur. When the pump 700 is driven in the state shown in FIGS. 23 and 24 (“unlocked state”) in which the lock pin 910 is in the unlocked position, vibration of the rotational drive device 800, elastic restoring force of a twisted or curved tube, or intention The pump 700 may be lifted upward from the attachment 900 due to an external force or the like that is not applied, and may further fall off from the attachment 900. As a result, the magnetic coupling force between the driven magnet 725 and the drive magnet 825 decreases or disappears, the rotation of the impeller 720 stops suddenly, and blood cannot be sent. Whether or not the lock pin 910 is at the lock position (see FIG. 25) can be confirmed at the position of the lock pin 910 in the radial direction. However, since the amount of movement of the lock pin 910 from the non-lock position to the lock position is about several millimeters, it is difficult to intuitively recognize whether or not the lock pin 910 is in the lock position.

  This invention solves said subject which the conventional attachment has. A first object of the present invention is to make it possible to attach a pump to an attachment without rotating the pump. A second object of the present invention is to provide an attachment including a lock mechanism that maintains a state in which the pump is mounted. In the attachment, it is possible to easily recognize whether or not the lock mechanism is in a locked state. Is to reduce the possibility of an erroneous operation of forgetting to perform an operation of shifting to a locked state.

The attachment of the present invention can be attached to a rotary drive device having a drive head that rotationally drives a liquid feed pump. The pump includes an annular pedestal at a lower end thereof, and an outer peripheral surface of the pedestal is a cylindrical surface coaxial with a rotor built in the pump. A concave portion and a groove connected to the concave portion are formed on the outer peripheral surface of the pedestal. The recess extends in parallel with the rotation axis direction of the rotor. The groove extends along a circumferential direction of the pedestal. The pump can be detachably attached to the attachment. The attachment has an annular shape surrounding the drive head. The attachment includes a fixed ring and a movable ring arranged coaxially. The fixing ring includes a fixing claw protruding inward from an inner peripheral surface of the fixing ring. The movable ring includes a movable claw that protrudes inward from an inner peripheral surface of the movable ring, and an operation lever that protrudes outward from an outer peripheral edge of the movable ring. The movable ring can be rotated with respect to the fixed ring between a first position and a second position by operating the operation lever. When the movable ring is in the first position, the pedestal can be fitted into the attachment, and the fixed claw and the movable claw can be fitted into the recess of the pedestal. When the movable ring is rotated to the second position in a state where the pedestal is fitted in the attachment, the movable claw is fitted in the groove.

  The attachment of the present invention includes a fixed ring having a fixed claw and a movable ring having a movable claw, and the movable ring is rotatable. Therefore, the pump can be positioned in the vertical direction by rotating the movable ring and engaging the movable claw with the pump. Thereby, unlike a conventional attachment, the pump can be mounted on the attachment without rotating the pump within the attachment.

  The movable ring provided with the movable claw functions as a lock mechanism that maintains the state where the pump is mounted. Whether the movable ring is in the locked state (second position) or in the unlocked state (first position) can be determined from the circumferential position of the operation lever protruding from the movable ring. Since the amount of change in the circumferential position of the operation lever is larger than the amount of change in the radial position of the lock pin of the conventional attachment, it can be easily recognized whether or not the lock mechanism is in the locked state. . This reduces the possibility of an erroneous operation of forgetting to perform an operation of shifting the lock mechanism to the locked state.

FIG. 1 is a perspective view of an attachment according to Embodiment 1 of the present invention, which is attached to an upper housing of a rotary drive device. FIG. 2 is an exploded perspective view of the attachment according to the first embodiment of the present invention. FIG. 3 is a perspective view showing a state before the pump is mounted on the attachment according to Embodiment 1 of the present invention. FIG. 4 is a perspective view showing a state where the pedestal of the pump is inserted into the attachment according to the first embodiment of the present invention. FIG. 5A is a perspective view showing a state in which the movable ring is rotated from the state of FIG. FIG. 5B is a perspective view showing the attachment of FIG. 5A with the pump omitted. FIG. 6A is a perspective view illustrating a state in which the mounting of the pump on the attachment according to the first embodiment of the present invention is completed. FIG. 6B is a perspective view showing the attachment of FIG. 6A without the pump. FIG. 7 is a perspective view of the attachment according to the second embodiment of the present invention, which is attached to the upper housing of the rotary drive device. FIG. 8A is an exploded perspective view of the attachment according to the second embodiment of the present invention as viewed from above. FIG. 8B is an exploded perspective view of the attachment according to Embodiment 2 of the present invention as viewed from below. FIG. 9 is a perspective view showing a state before the pump is mounted on the attachment according to the second embodiment of the present invention. FIG. 10 is a perspective view illustrating a state in which the movable ring is rotated to the first position by operating the operation lever immediately before the pump is mounted on the attachment according to the second embodiment of the present invention. FIG. 11 is a perspective view showing a state immediately after the pump base is inserted into the attachment according to the second embodiment of the present invention. FIG. 12A is a perspective view illustrating a state where the mounting of the pump to the attachment according to the second embodiment of the present invention is completed. FIG. 12B is a perspective view showing the attachment of FIG. 12A without the pump. FIG. 13 is a perspective view of the attachment according to the third embodiment of the present invention, which is attached to the upper housing of the rotary drive device. FIG. 14 is an exploded perspective view of the attachment according to the third embodiment of the present invention as viewed from above. FIG. 15 is a perspective view showing a state before the pump is mounted on the attachment according to Embodiment 3 of the present invention. FIG. 16: is the perspective view which showed the state which inserted the base of the pump in the attachment which concerns on Embodiment 3 of this invention. FIG. 17A is a perspective view showing a state in which the movable ring is rotated from the state of FIG. FIG. 17B is a perspective view showing the attachment of FIG. 17A with the pump omitted. FIG. 18 is a cross-sectional view showing a state in which the pump is mounted on the rotary drive device via a conventional attachment. FIG. 19A is a perspective view of the pump as seen from above. FIG. 19B is a perspective view of the pump as viewed from below. FIG. 20 is a perspective view of a conventional attachment (the lock pin is in the unlocked position) attached to the upper housing of the rotary drive device. FIG. 21 is a perspective view of a conventional attachment (the lock pin is in the lock position) attached to the upper housing of the rotary drive device. FIG. 22 is a perspective view showing a state before the pump is mounted on a conventional attachment. FIG. 23 is a perspective view showing a state where the base of the pump is inserted into the base of the conventional attachment. FIG. 24 is a perspective view showing a state in which the pump is rotated from the state of FIG. FIG. 25 is a perspective view showing a state in which the lock pin is pushed from the state of FIG. 24 and the mounting of the pump on the conventional attachment is completed.

  The attachment according to the present invention may further include a holding mechanism for holding the movable ring in the second position. Thereby, the possibility that the movable ring in the second position (locked position) unintentionally moves to the first position (unlocked position) and the locked state is released can be reduced. .

  The holding mechanism may include an engaging member that engages with the movable ring at the second position so that the movable ring at the second position cannot be rotated to the first position. This is advantageous in further reducing the possibility that the movable ring is unintentionally moved to the first position (unlocked position) and the locked state is released.

  In the above, even when the movable ring is rotated from the first position to the second position, the engaging member is engaged with the movable ring so that the movable ring cannot be rotated immediately. Good. As a result, the holding mechanism is activated at the same time as the locking mechanism shifts to the locked state. For this reason, since an independent operation for enabling the holding mechanism is not required, the holding mechanism can be reliably functioned.

  The holding mechanism may include a biasing member that biases the movable ring toward the second position. Thereby, the structure of the holding mechanism can be simplified. Further, since an independent operation for enabling the holding mechanism is not required, the holding mechanism can be reliably functioned.

  When the movable ring is in the first position, the movable claw overlaps the fixed claw in the vertical direction, and when the movable ring is in the second position, the movable claw is circumferential with respect to the fixed claw. The position may be shifted. This is advantageous from the viewpoint of facilitating the design and assembly of the attachment.

  The attachment of the present invention may include an axis alignment member that aligns the pump so that a rotor of the pump is coaxial with the drive head. This is advantageous for properly magnetically coupling the drive magnet of the drive head and the driven magnet of the rotor.

  The shaft alignment member may be an upper ring disposed on a side opposite to the rotation driving device with respect to the fixed ring and the movable ring. By providing an alignment member separately from the fixed ring and the movable ring, the pump can be more accurately aligned with the drive head. Moreover, the structure which makes a movable ring rotatable is easily realizable.

  Alternatively, the shaft alignment member may be the fixing ring. Thereby, since the number of parts which comprise an attachment can be decreased, the structure of an attachment can be simplified.

  It is preferable that the fixed claw is disposed closer to the rotation drive device than the movable claw. Thereby, the attachment which can be attached or detached without design-deforming the conventionally used pump shown to FIG. 19A and FIG. 19B can be comprised.

  The fixed ring may be disposed closer to the rotary drive device than the movable ring. Thereby, the structure which arrange | positions a fixed nail | claw to the rotation drive device side rather than a movable nail | claw can be implement | achieved easily.

  Alternatively, the movable ring may be disposed closer to the rotational drive device than the fixed ring. As a result, a guide surface for inserting the pump into the attachment can be provided on the fixing ring, and the fixing ring bears an axial alignment function for aligning the pump so that the rotor of the pump is coaxial with the drive head. Can be made.

  The number of the fixed claws and the number of the movable claws may be the same. This is advantageous from the viewpoint of facilitating the design and assembly of the attachment.

  The number of the movable claws may be three. This is advantageous for positioning the pump at a predetermined position in the vertical direction without tilting the rotation shaft of the rotor.

  The pump may include an annular pedestal at its lower end. The outer peripheral surface of the pedestal may be a cylindrical surface coaxial with a rotor built in the pump. A plurality of recesses and a plurality of grooves connected to the plurality of recesses may be formed at equiangular intervals on the outer peripheral surface of the pedestal with respect to the rotation axis of the rotor. Each of the plurality of recesses may extend in parallel with the rotation axis direction of the rotor. Each of the plurality of grooves may extend along a circumferential direction of the pedestal. When the movable ring is in the first position, it is preferable that the pedestal can be fitted into the attachment, and the fixed claw and the movable claw can be fitted into the recess of the pedestal. When the movable ring is rotated to the second position in a state where the pedestal is fitted in the attachment, it is preferable that the movable claw is fitted in the groove. Accordingly, the conventionally used pump can be detachably attached to the attachment of the present invention without changing the design.

  When the fixed claw is fitted in the recess of the pedestal, the fixed claw can restrict the pedestal from rotating with respect to the attachment. Thereby, the situation where the pump rotates with respect to the attachment and the movable claw comes out of the groove of the base does not occur.

  When the movable claw is fitted in the groove, the movable claw may restrict the pedestal from coming out of the attachment. Thereby, the state in which the pump was appropriately attached to the attachment can be maintained.

  The pump may be a turbo blood pump in which an impeller having a plurality of vanes rotates in a pump chamber.

  Below, this invention is demonstrated in detail, showing suitable embodiment. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, the drawings referred to in the following description show only the main members necessary for explaining the present invention in a simplified manner among the members constituting the embodiment of the present invention. Therefore, the present invention can include any member not shown in the following drawings. Further, in the following drawings, the actual dimensions of members and the dimensional ratios of the members are not necessarily represented faithfully. In the figure shown below, the same code | symbol is attached | subjected to the same member and the overlapping description about them is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a perspective view of an attachment 100 according to Embodiment 1 of the present invention. The attachment 100 according to the first embodiment can be attached to the rotational drive device 800 in place of the conventional attachment 900 described above, coaxially with the central axis 800a (see FIG. 18) of the rotational drive device 800. And the pump 700 mentioned above can be attached to the attachment 100 so that attachment or detachment is possible. The same members as those shown in FIGS. 18 to 25 relating to the prior art are denoted by the same reference numerals, and description thereof is omitted. Similar to the conventional attachment 900, the attachment 100 has an annular shape with an opening at the center so that the drive head 820 (see FIG. 18) and the head cover 805 of the rotary drive device 800 can be surrounded.

  FIG. 2 is an exploded perspective view of the attachment 100 as viewed from above. The attachment 100 includes a fixed ring 110, a movable ring 120, and an upper ring 140, all of which have an annular shape, in this order from the upper housing 801 side of the rotary drive device 800.

  A circular opening (through hole) coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is formed at the center of the fixing ring 110. Three fixed claws 111 protrude from the inner peripheral surface 112 of the opening toward the inside (that is, the drive head 820). The fixed claws 111 are arranged at intervals of 120 degrees. The tip of the fixed claw 111 viewed from above has a semicircular shape.

  Four through holes 113 penetrate the fixing ring 110 in the vertical direction. A cylindrical spacer 114 protrudes upward from an edge surrounding the through hole 113.

  A housing portion 115 is formed on the outer peripheral edge of the fixing ring 110 by cutting out a part thereof in a concave shape. A release button 116 is accommodated in the accommodating portion 115. Two side surfaces facing in the circumferential direction that define the accommodating portion 115 regulate the position in the circumferential direction of the release button 116 accommodated in the accommodating portion 115. A coil spring 118 is interposed between a wall surface perpendicular to the radial direction that defines the housing portion 115 and an end surface of the release button 116 facing the wall surface. The coil spring 118 urges the release button 116 outward along the radial direction. A cam shaft 117 protrudes upward from the upper surface of the release button 116.

  In the center of the movable ring 120, a circular opening (through hole) coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is formed. Three movable claws 121 protrude from the inner peripheral surface 122 of the opening toward the inside (that is, the drive head 820). The movable claws 121 are arranged at intervals of 120 degrees. The movable claw 121 is a thin plate-like object parallel to the horizontal surface, and the tip of the movable claw 121 viewed from above has a semicircular shape with substantially the same radius as the fixed claw 111.

  An operation protrusion 125 protrudes outward from the outer peripheral edge of the movable ring 120 along the radial direction. An operation lever 127 is attached to the operation protrusion 125. More specifically, the operation lever 127 is placed on the upper surface of the operation protrusion 125, and the fixing screw 128 is inserted into the through hole formed in the operation protrusion 125 from below and screwed into the operation lever 127.

  Three guide holes 123 and a cam hole 124 are formed in the movable ring 120. Both the guide hole 123 and the cam hole 124 are through holes that penetrate the movable ring 120 in the vertical direction. The guide hole 123 extends along an arc that is coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800. The cam hole 124 has a substantially “L” shape bent at the bent portion 124c. A portion between one end 124a and the bent portion 124c of the cam hole 124 is along an arc that is coaxial with the drive head 820 of the rotation drive device 800, and the other end (outer end) 124b of the cam hole 124 and the bent portion 124c The part between is along the radial direction. The outer end 124b is disposed outside the bent portion 124c (on the side farther from the drive head 820).

  A circular opening (through hole) that is coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is also formed in the center of the upper ring 140. The diameter of the opening is preferably the same as or slightly smaller than the diameter of each opening of the stationary ring 110 and the movable ring 120. A guide surface 141 is formed at the edge of the opening on the upper surface of the upper ring 140. The guide surface 141 is a conical surface (tapered surface) that is coaxial with the drive head 820 and descends downward as it approaches the inner side (drive head 820).

  The four through holes 143 penetrate the upper ring 140 in the vertical direction. The position of the through hole 143 coincides with the position of the through hole 113 of the fixing ring 110.

  On the upper housing 801 (see FIG. 1) of the rotary drive device 800, the fixed ring 110, the movable ring 120, and the upper ring 140 are stacked in this order coaxially with the drive head 820. Then, the fixing screw 149 is inserted into the through hole 143. The fixing screw 149 passes through the through hole 143, the guide hole 123, and the through hole 113 in order, and is screwed into a screw hole (female screw, not shown) formed in the upper housing 801. Thus, the attachment 100 is attached to the upper housing 801 of the rotary drive device 800 as shown in FIG.

  The spacer 114 protruding from the upper surface of the fixed ring 110 is inserted into the guide hole 123 of the movable ring 120. Of the four spacers 114, two spacers 114 that are close to each other in the circumferential direction are inserted into the three guide holes 123 that are long in the circumferential direction. The upper end of the spacer 114 is in contact with the lower surface of the upper ring 140. The spacer 114 maintains a constant vertical distance between the fixing ring 110 and the upper ring 140. Since the spacer 114 is inserted into the guide hole 123 of the movable ring 120, the movable ring 120 rotates in the circumferential direction around the central axis 800 a of the rotation driving device 800 with respect to the fixed ring 110 and the upper ring 140. be able to. The movable ring 120 can be rotated using an operation lever 127 attached to an operation protrusion 125 protruding from the movable ring 120. On the other hand, the fixing ring 110 and the upper ring 140 cannot move with respect to the upper housing 801.

  The cam shaft 117 protruding from the upper surface of the release button 116 is fitted into the cam hole 124 of the movable ring 120. When the movable ring 120 rotates, the cam shaft 117 moves in the cam hole 124. The cam shaft 117 and the cam hole 124 define a rotatable angle range of the movable ring 120. The cam shaft 117 and the cam hole 124 define the radial position of the release button 116 urged outward along the radial direction by the coil spring 118.

  A method for attaching / detaching the pump 700 to / from the attachment 100 of the present embodiment configured as described above will be described.

  First, as shown in FIG. 3, the pump 700 is opposed to the attachment 100. The pump 700 is the same as that described in FIGS. 19A and 19B. Although not shown, a tube constituting an extracorporeal blood circulation circuit is already connected to the inlet port 712 and the outlet port 713. The rotation driving device 800 is fixed at a predetermined position by a jig (not shown). In the initial state shown in FIG. 3, the movable claw 121 of the movable ring 120 of the attachment 100 faces the fixed claw 111 of the fixed ring 110 in the vertical direction (overlaps). The operation lever 127 of the movable ring 120 is located near the release button 116. This position of the movable ring 120 is referred to as a “first position”. Although not shown, the cam shaft 117 of the release button 116 is located at the end 124 a (see FIG. 2) of the cam hole 124 of the movable ring 120. The release button 116 is in a position retracted from the outer peripheral surface of the fixing ring 110 on both sides in the circumferential direction (that is, the position on the drive head 820 side).

  Next, the pump 700 is brought close to the attachment 100. The base 730 of the pump 700 is inserted into the central opening of the upper ring 140 of the attachment 100. The inclined guide surface 141 guides the base 730 into the opening. The pump 700 is slightly rotated in the circumferential direction, and the movable claw 121 and the fixed claw 111 of the attachment 100 are sequentially fitted into the recess 731 (see FIGS. 19A and 19B) of the base 730 of the pump 700. The movable ring 120 is in the first position as in FIG. 3, and the movable claw 121 and the fixed claw 111 are opposed to each other in the vertical direction. Therefore, as the pedestal 731 descends, the movable claw 121 and the fixed claw 111 are fitted into the same recess 731 of the pedestal 730. Since the radius of the semi-cylindrical surface of the dummy recess 732 is smaller than the semicircular radius of the tip of the movable claw 121 and the fixed claw 111, the movable claw 121 and the fixed claw 111 cannot be fitted into the dummy recess 732. . The pedestal 730 can be inserted into the attachment 100 until the lower surface of the pedestal 730 contacts the upper housing 801.

  FIG. 4 is a perspective view showing a state where the base 730 of the pump 700 is inserted into the attachment 100 to the deepest. The operating lever 127 is in the same position as in FIG. 3, so that the movable ring 120 is still in the first position. Although not shown, the groove 733 (see FIGS. 19A and 19B) formed in the base 730 is aligned with the movable claw 121 in the vertical direction. When the pump 700 is lifted upward in the state of FIG. 4, the pump 700 can be separated from the attachment 100. The inner edge of the central opening of the upper ring 140 is in contact with the outer peripheral surface of the base 730 of the pump 700 to position the pump 700 in the horizontal direction. Therefore, the drive head 820 and the impeller 720 are aligned coaxially.

  Next, as shown in FIG. 5A, the operation lever 127 is rotated in the counterclockwise direction (arrow R1) when viewed from above. FIG. 5B shows the attachment 100 in the same state as FIG. 5A with the pump 700 omitted. By rotating the operation lever 127, the movable ring 120 rotates and the movable claw 121 moves in the circumferential direction. At this time, the fixed claw 111 is not displaced. Since the fixed claw 111 is fitted in the recess 731 of the base 730, the pump 700 does not rotate even if the movable ring 120 rotates. Accordingly, the movable claw 121 moves from the recess 731 into the groove 733 (see FIGS. 19A and 19B). The amount of rotation of the movable ring 120 is regulated by the cam shaft 117 of the release button 116 reaching the bent portion 124c (see FIG. 2) of the cam hole 124 of the movable ring 120. In this embodiment, the rotatable angle range of the movable ring 120 is about 15 degrees. Simultaneously with the cam shaft 117 reaching the bent portion 124c, the movable claw 121 may collide with the rear end 733b of the groove 733 (see FIGS. 19A and 19B). This position of the movable ring 120 is referred to as a “second position”. Since the movable claw 121 is fitted in the groove 733 of the base 730, the pump 700 is positioned in the vertical direction with respect to the attachment 100 and the rotation driving device 800. Therefore, the pump 700 cannot be separated from the attachment 100 even if the pump 700 is lifted upward.

  When the movable ring 120 is rotated to the position shown in FIGS. 5A and 5B, as described above, the cam shaft 117 of the release button 116 is in the bent portion 124 c (see FIG. 2) of the cam hole 124 of the movable ring 120. To reach. Immediately after this, the coil spring 118 pushes the release button 116 outward in the radial direction until the cam shaft 117 reaches the outer end 124 b of the cam hole 124. FIG. 6A is a perspective view showing a state in which the release button 116 is pushed out. FIG. 6B shows the attachment 100 in the same state as FIG. 6A, with the pump 700 omitted. 6A and 6B, as shown in FIGS. 6A and 6B, in FIG. 6A and FIG. 6B, the release button 116 has fixing rings on both sides in the circumferential direction of the release button 116. It has moved outward to a position that forms a curved surface that is substantially the same as the outer peripheral surface of 110. Thus, the mounting of the pump 700 to the attachment 100 is completed.

  6A and 6B, the cam shaft 117 of the release button 116 is located at the outer end 124b of the cam hole 124 of the movable ring 120 (see FIG. 2). Therefore, the movable ring 120 cannot be rotated. In addition, the movable claw 121 is fitted in the groove 733 of the base 730. Therefore, even if the pump 700 is lifted upward, the pump 700 and the attachment 100 cannot be separated in the vertical direction. Further, the fixing claw 111 is fitted in the recess 731 of the base 730. Therefore, the pump 700 cannot be rotated with respect to the attachment 100 and the rotation driving device 800. 6A and 6B, the impeller 720 and the drive head 820 are aligned coaxially, and the driven magnet 725 of the impeller 720 is magnetically coupled to the drive magnet 825 of the drive head 820. When the drive head 820 is rotated, the impeller 720 follows and rotates, and blood can flow in from the inlet port 712 and flow out from the outlet port 713.

  In order to separate the pump 700 from the attachment 100 from the state of FIG. 6A and FIG. 6B, it is possible to perform roughly the operation reverse to the above.

  That is, first, the release button 116 is pushed in until the state shown in FIGS. 5A and 5B is reached. The cam shaft 117 of the release button 116 moves from the outer end 124b to the bent portion 124c (see FIG. 2) in the cam hole 124 of the movable ring 120.

  Next, the operating lever 127 is moved closer to the release button 116 while pushing the release button 116. The movable ring 120 rotates in the clockwise direction when viewed from above. Thereby, the cam shaft 117 of the release button 116 moves from the bent portion 124c to the end 124a (see FIG. 2) in the cam hole 124 of the movable ring 120. In parallel with this, the movable claw 121 moves from the groove 733 into the recess 731. As a result, the state shown in FIG. 4 is obtained. Even if the pressing force on the release button 116 is released, the release button 116 remains pressed.

  Finally, the pump 700 is lifted upward. Thereby, as shown in FIG. 3, the pump 700 can be separated from the attachment 100.

  As described above, according to the present embodiment, as shown in FIGS. 6A and 6B, if the base 730 of the pump 700 is inserted into the attachment 100 and the movable ring 120 is rotated to the second position. The mounting of the pump 700 to the attachment 100 is completed. The inner edge of the central opening of the upper ring 140 of the attachment 100 aligns the pump 700 horizontally so that the impeller 720 is coaxial with the drive head 820. The movable claw 121 of the attachment 100 restricts the vertical movement of the pump 700 so that the base 730 of the pump 700 does not come out of the attachment 100. As a result, the driven magnet 725 of the impeller 720 and the drive magnet 825 of the drive head 820 are brought close to a desired distance and magnetically coupled. Therefore, it is possible to feed blood by rotating the impeller 720 following the rotation of the drive head 820.

  When the pump 700 is attached to the attachment 100, after the base 730 of the pump 700 is once inserted into the attachment 100 (see FIG. 4), the attachment of the pump 700 to the attachment 100 is completed (see FIGS. 6A and 6B). In the meantime, it is not necessary to rotate the pump 700 with respect to the attachment 100 and the rotation drive device 800. Further, when the pedestal 730 is inserted into the attachment 100, the fixing claw 111 of the attachment 100 is fitted into the recess 731 of the pedestal 730, so that the pump 700 cannot be rotated with respect to the attachment 100. Therefore, unlike the case where the conventional attachment 900 is used, in this embodiment, the tube connected to the inlet port 712 and the outlet port 713 is not twisted or bent in the process of mounting the pump 700 to the attachment 100. A good flow of blood in the tube can be ensured.

  As long as the movable ring 120 is positioned at the second position with the pedestal 730 inserted into the attachment 100, the state in which the pump 700 is attached to the attachment 100 is maintained. Therefore, the movable ring 120 that includes the movable claw 121 and is rotatable constitutes a “lock mechanism” for maintaining the pump 700 properly attached.

  In order to shift to the “locked state” in which the lock mechanism functions effectively, the movable ring 120 is moved from the first position (“unlocked position”, see FIG. 4) to the second position (“locked” using the operation lever 127. It is necessary to perform an operation of rotating to “position” (see FIGS. 5A and 5B). In this embodiment, as is easily understood by comparing FIG. 4 and FIG. 6A, is the locked state depending on the circumferential position of the operation lever 127 protruding outward from the outer peripheral edge of the movable ring 120? You can check whether or not. For example, when the radial distance from the rotation center axis of the drive head 820 to the operation lever 127 is 50 mm, the circumferential movement amount when the operation lever 127 is rotated by 15 degrees with respect to the center axis is 13 mm. Become. This is much larger than the amount of movement in the radial direction of the lock pin 910 of the conventional attachment 900 is about 5 mm. Therefore, the attachment 100 according to the present embodiment can easily visually recognize whether or not the operation lever 127 is in the locked state.

  Furthermore, when shifting to the locked state, the release button 116 is pushed outward along the radial direction (see FIGS. 6A and 6B). Therefore, in addition to the operation lever 127, whether or not it is in a locked state can be visually recognized by the position of the release button 116. The amount of movement of the release button 116 in the radial direction depends on the distance between the bent portion 124c of the cam hole 124 and the outer end 124b. This distance can be set arbitrarily, and the longer the distance, the greater the amount of movement of the release button 116. Therefore, it is possible to improve the visibility of whether or not the lock button is in the locked state using the position of the release button 116.

  Further, the inner wall surface 115a (see FIG. 5A) substantially parallel to the radial direction of the accommodating portion 115 of the fixing ring 110 may be colored. In this case, coloring can be visually recognized when the release button 116 is pushed in, and when the release button 116 is pushed out, the coloring is hidden by the release button 116 and cannot be seen (see FIG. 6A). This makes it easier to check whether or not the lock state is established.

  Thus, in this embodiment, it can be visually recognized easily whether it is a locked state. For this reason, the possibility of an erroneous operation in which the operator forgets to perform an operation of shifting the lock mechanism to the locked state is reduced.

  When the movable ring 120 is rotated to the second position, the cam shaft 117 of the release button 116 immediately moves to the outer end 124b (see FIG. 2) of the cam hole 124 of the movable ring 120. As a result, the movable ring 120 is engaged by the cam shaft 117, and the movable ring 120 cannot be rotated. Thus, the attachment 100 includes a “holding mechanism” that functions to hold the movable ring 120 in the second position (lock position). As a result, it is possible to prevent the movable ring 120 in the second position (locked position) from unintentionally moving to the first position (unlocked position) and releasing the locked state. .

  In the first embodiment, the holding mechanism includes a cam shaft 117 (engagement member) that engages the movable ring 120 at the second position. The engaging member engages with the movable ring 120 so that the movable ring 120 at the second position cannot be rotated to the first position. The holding mechanism including such an engaging member is advantageous in reducing the possibility that the movable ring 120 may unintentionally move to the first position and the locked state is released.

  The cam shaft 117 is immediately engaged with the movable ring 120 when the movable ring 120 is rotated from the first position and reaches the second position, and the holding mechanism is activated. That is, when the lock mechanism is shifted to the locked state, the holding mechanism is simultaneously activated. An independent operation for activating the holding mechanism is not necessary. Thereby, a holding mechanism can be functioned reliably.

  In order to release the locked state, it is necessary to push the release button 116 and rotate the operation lever 127 at the same time. The lock state is not released simply by pressing the release button 116 or simply applying a clockwise force to the operation lever 127 as viewed from above. Therefore, even if an unintended external force is applied to the attachment 100 to which the pump 700 is attached, the possibility that the locked state is released is low, and the pump 700 is unlikely to fall off the attachment 100. For this reason, the attachment 100 is excellent in safety.

  In a state where the pedestal 730 of the pump 700 is inserted into the attachment 100, the fixing claw 111 of the fixing ring 110 is fitted into the recess 731 of the pedestal 730. For this reason, the pump 700 cannot be rotated with respect to the attachment 100 and the rotation drive device 800. Therefore, in the locked state (see FIGS. 6A and 6B), the pump 700 does not rotate with respect to the attachment 100 and the movable claw 121 does not come out of the groove 733.

  The attachment 100 of the present embodiment can be used in place of the conventional attachment 900. The rotary drive device 800 (particularly its upper housing 801) and the pump 700 that have been used in the past can be used continuously without any design deformation. Therefore, it is excellent in cost effectiveness.

(Embodiment 2)
FIG. 7 is a perspective view of an attachment 200 according to Embodiment 2 of the present invention. As with the attachment 100 of the first embodiment, the attachment 200 of the second embodiment is coaxial with the central axis 800a (see FIG. 18) of the rotation driving device 800 in place of the conventional attachment 900 described above. Can be attached. And the pump 700 mentioned above can be attached to the attachment 200 so that attachment or detachment is possible. The same members as those shown in FIGS. 1 to 6B relating to the first embodiment and FIGS. Similar to the conventional attachment 900, the attachment 200 has an annular shape with an opening at the center so as to surround the drive head 820 (see FIG. 18) and the head cover 805 of the rotary drive device 800.

  FIG. 8A is an exploded perspective view of the attachment 200 as viewed from above. FIG. 8B is an exploded perspective view of the attachment 200 as viewed from below. The attachment 200 includes a fixed ring 210, a movable ring 220, an auxiliary ring 230, and an upper ring 240, all of which have an annular shape, in this order from the upper housing 801 side of the rotary drive device 800.

  In the center of the fixing ring 210, a circular opening (through hole) coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is formed. Three fixing claws 211 protrude from the inner peripheral surface 212 of the opening toward the inside (that is, the drive head 820). The fixed claws 211 are arranged at intervals of 120 degrees. The tip of the fixed claw 211 viewed from above has a semicircular shape.

  Four through-holes 213 penetrate the fixing ring 210 in the vertical direction.

  As shown in FIG. 8A, three grooves 215 are formed on the upper surface of the fixing ring 210. The three grooves 215 are arranged at equiangular intervals with respect to the central axis 800a (see FIG. 18) of the rotary drive device 800. The groove 215 extends along an arc that is coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800.

  A slider 216 and a coil spring 218 are accommodated in each groove 215. One end of the coil spring 218 in the longitudinal direction (front end in the clockwise direction when viewed from above) is brought into contact with the inner wall surface of one end of the groove 215 (front end in the clockwise direction when viewed from above). The other end (front end in the counterclockwise direction when viewed from above) of the coil spring 218 is connected to the slider 216. Thus, in the groove 215, the coil spring 218 urges the slider 216 counterclockwise as viewed from above. A connecting shaft 217 protrudes upward from the upper surface of the slider 216.

  In the center of the movable ring 220, a circular opening (through hole) coaxial with the driving head 820 (see FIG. 18) of the rotary driving device 800 is formed. Three movable claws 221 protrude from the inner peripheral surface 222 of the opening toward the inside (that is, the drive head 820). The movable claws 221 are arranged at intervals of 120 degrees. The movable claw 221 is a thin plate-like object parallel to the horizontal surface, and the tip of the movable claw 221 viewed from above has a semicircular shape with substantially the same radius as the fixed claw 211.

  An operation protrusion 225 protrudes outward from the outer peripheral edge of the movable ring 220 along the radial direction. An operation lever 227 is attached to the operation protrusion 225. More specifically, the operation lever 227 is placed on the upper surface of the operation protrusion 225, and the fixing screw 228 is inserted into the through hole formed in the operation protrusion 225 from below and screwed into the operation lever 227.

  Three connecting holes 223 are formed in the movable ring 220. The three connection holes 223 are arranged at equiangular intervals with respect to the central axis 800a (see FIG. 18) of the rotary drive device 800. The connection hole 223 is a small-diameter through-hole that penetrates the movable ring 220 in the vertical direction.

  A circular opening (through hole) that is coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is also formed in the center of the auxiliary ring 230. The diameter of the opening is preferably the same as or slightly smaller than the diameter of each opening of the stationary ring 210 and the movable ring 220. The auxiliary ring 230 is formed with three connecting holes 233 and three guide holes 235. All of the three connection holes 233 and the three guide holes 235 are arranged at equiangular intervals with respect to the central axis 800a (see FIG. 18) of the rotation drive device 800. The connection hole 233 is a small-diameter through hole that penetrates the auxiliary ring 230 in the vertical direction. The guide hole 235 extends from the first end 235a to the second end 235b along an arc that is coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800. When viewed from above, the first end 235a is positioned more forward in the counterclockwise direction than the second end 235b.

  The upper ring 240 includes a top plate 240a along the horizontal direction and a side wall 240b having a substantially cylindrical surface shape extending downward from the outer peripheral edge of the top plate 240a. A circular opening (through hole) coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is formed in the center of the top plate 240a. The diameter of the opening is preferably the same as or slightly smaller than the diameter of each opening of the stationary ring 210 and the movable ring 220. A guide surface 241 is formed at the edge of the opening on the top surface of the top plate 240a. The guide surface 241 is a conical surface (tapered surface) coaxial with the drive head 820 that descends downward as it approaches the inner side (drive head 820).

  The four through holes 243 penetrate the top plate 240a of the upper ring 240 in the vertical direction. The position of the through hole 243 coincides with the position of the through hole 213 of the fixing ring 210.

  The fixing lever 247 protrudes outward along the radial direction from the side wall 240b.

  As shown in FIG. 8B, the three spacers 244 protrude downward from the lower surface of the top plate 240a. The three spacers 244 are arranged at equiangular intervals with respect to the central axis 800a (see FIG. 18) of the rotary drive device 800.

  A cutout 248 formed by cutting out a part of the side plate 240b from the lower end of the side plate 240b upward is formed in the side plate 240b.

  On the upper housing 801 (see FIG. 7) of the rotary drive device 800, the fixed ring 210, the movable ring 220, the auxiliary ring 230, and the upper ring 240 are stacked in this order coaxially with the drive head 820. Then, the fixing screw 249 is inserted into the through hole 243. The fixing screw 249 passes through the through hole 243, the guide hole 235, and the through hole 213 in this order, and is screwed into a screw hole (female screw, not shown) formed in the upper housing 801. Thus, the attachment 100 is attached to the upper housing 801 of the rotary drive device 800 as shown in FIG.

  The movable ring 220 and the auxiliary ring 230 are accommodated in the side wall 240b of the upper ring 240. The operation protrusion 225 protruding from the movable ring 220 protrudes out of the side wall 240b through the notch 248 of the side wall 240b. The operation lever 227 is attached to a portion of the operation protrusion 225 that protrudes outside the side wall 240b.

  The spacer 244 protruding from the lower surface of the top plate 240 a of the upper ring 240 is fitted into the guide hole 235 of the auxiliary ring 230. The lower end of the spacer 244 contacts the upper surface of the fixing ring 210. The movable ring 220 is disposed inside the three spacers 244 (side closer to the drive head 820). The spacer 244 maintains a constant vertical distance between the fixing ring 210 and the top plate 240a of the upper ring 240.

  The connecting shaft 217 protruding from the upper surface of the slider 216 is fitted into the connecting hole 223 of the movable ring 220 and the connecting hole 233 of the auxiliary ring 230. Therefore, the movable ring 220 and the auxiliary ring 230 are connected via the connecting shaft 217 of the slider 216. Further, the spacer 244 is inserted into the guide hole 235 of the auxiliary ring 230. For this reason, the movable ring 220 and the auxiliary ring 230 can integrally rotate in the circumferential direction around the central axis 800 a of the rotation driving device 800 with respect to the fixed ring 210 and the upper ring 240. The pivotable angle range of the movable ring 220 and the auxiliary ring 230 is defined by the spacer 244 colliding with the first end 235a and the second end 235b of the arcuate guide hole 235. In the present embodiment, the rotatable angle range of the movable ring 220 and the auxiliary ring 230 is about 15 degrees. On the other hand, the fixing ring 210 and the upper ring 240 cannot move with respect to the upper housing 801.

  The coil spring 218 urges the movable ring 220 and the auxiliary ring 230 integrally in the counterclockwise direction through the slider 216 and the connecting shaft 217 as viewed from above. Using the operation lever 227 attached to the operation protrusion 225 protruding from the movable ring 220, the movable ring 220 and the auxiliary ring 230 can be rotated in the clockwise direction against the elastic force of the coil spring 218.

  A method of attaching / detaching the pump 700 to / from the attachment 200 of the present embodiment configured as described above will be described.

  First, as shown in FIG. 9, the pump 700 is opposed to the attachment 200. The pump 700 is the same as that described in FIGS. 19A and 19B. Although not shown, a tube constituting an extracorporeal blood circulation circuit is already connected to the inlet port 712 and the outlet port 713. The rotation driving device 800 is fixed at a predetermined position by a jig (not shown). In the initial state shown in FIG. 9, as described above, the movable ring 220 and the auxiliary ring 230 are urged counterclockwise as viewed from above by the elastic force of the coil spring 218 (see FIGS. 8A and 8B). . Although not shown, the spacer 244 is in contact with the second end 235 b of the guide hole 235. The operation lever 227 provided on the movable ring 220 is located farthest in the counterclockwise direction from the fixed lever 247. The movable claw 221 of the movable ring 220 is displaced in the circumferential direction with respect to the fixed claw 211 of the fixed ring 210. This position of the movable ring 220 is referred to as a “second position”.

  Next, as shown in FIG. 10, the operation lever 227 is rotated in the clockwise direction (arrow R2) as viewed from above. For example, if the thumb of the right hand is attached to the fixing lever 247, the index finger of the right hand is attached to the operation lever 227, and the index finger is brought close to the thumb, the operation lever 227 can be easily rotated. The movable ring 220 and the auxiliary ring 230 rotate together with the operation lever 227, and the coil spring 218 is elastically compressed. Although illustration is omitted, the operation lever 227 can be rotated until the spacer 244 contacts the first end 235a of the guide hole 235 (see FIG. 8A). FIG. 10 shows this state. The movable claw 221 of the movable ring 220 faces the overlapping claw 211 of the stationary ring 210 in the vertical direction (overlaps). This position of the movable ring 220 is referred to as a “first position”.

  Next, the pump 700 is moved closer to the attachment 200 while pressing the operation lever 227 so that the movable ring 220 is held at the first position. The base 730 of the pump 700 is inserted into the central opening of the upper ring 240 of the attachment 200. An inclined guide surface 241 guides the pedestal 730 into the opening. The pump 700 is slightly rotated in the circumferential direction, and the movable claw 221 and the fixed claw 211 of the attachment 200 are sequentially fitted into the recess 731 (see FIGS. 19A and 19B) of the base 730 of the pump 700. Since the movable claw 221 and the fixed claw 211 face each other in the vertical direction, the movable claw 221 and the fixed claw 211 are fitted into the same recess 731 of the base 730. Since the radius of the semi-cylindrical surface of the dummy recess 732 is smaller than the semicircular radius at the tips of the movable claw 221 and the fixed claw 211, the movable claw 221 and the fixed claw 211 cannot be fitted into the dummy recess 732. . The pedestal 730 can be inserted into the attachment 200 until the lower surface of the pedestal 730 contacts the upper housing 801.

  FIG. 11 is a perspective view showing a state where the base 730 of the pump 700 is inserted into the attachment 200 to the deepest. The operating lever 227 is in the same position as in FIG. 10, and therefore the movable ring 220 is still in the first position. Although not shown, the groove 733 (see FIGS. 19A and 19B) formed in the base 730 is aligned with the movable claw 221 in the vertical direction. When the pump 700 is lifted upward in the state of FIG. 11, the pump 700 can be separated from the attachment 200. The inner edges of the central openings of the upper ring 240 and the auxiliary ring 230 are in contact with the outer peripheral surface of the base 730 of the pump 700, thereby positioning the pump 700 in the horizontal direction. Therefore, the drive head 820 and the impeller 720 are aligned coaxially.

  Next, the finger is released from the operation lever 227. Immediately, the movable ring 220 is rotated counterclockwise by the coil spring 218 from the first position to the second position as viewed from above. The rotation of the movable ring 220 is regulated by the spacer 244 coming into contact with the second end 235b of the guide hole 235 (see FIG. 8A). FIG. 12A is a perspective view illustrating a state in which the movable ring 220 is rotated to the second position. The operation lever 227 has returned to the same position as in FIG. FIG. 12B shows the attachment 200 in the same state as FIG. 12A, with the pump 700 omitted. The state of the attachment 200 shown in FIG. 12B is the same as in FIG.

  As the movable ring 220 rotates to the second position, the movable claw 221 moves in the circumferential direction. At this time, the fixed claw 211 is not displaced. Since the fixed claw 211 is fitted in the recess 731 of the base 730, the pump 700 does not rotate even if the movable ring 220 rotates. Accordingly, the movable claw 221 moves from the recess 731 into the groove 733 (see FIGS. 19A and 19B). At the same time as the spacer 244 contacts the second end 235b (see FIG. 8A) of the guide hole 235, the movable claw 221 may collide with the rear end 733b (see FIGS. 19A and 19B) of the groove 733. Thus, the mounting of the pump 700 to the attachment 200 is completed.

  In the state shown in FIGS. 12A and 12B, the coil spring 218 biases the movable ring 220 to be held in the second position. Therefore, the movable ring 220 remains in the second position unless the operation lever 227 is rotated clockwise as viewed from above. Further, the movable claw 221 is fitted in the groove 733 of the base 730. Therefore, even if the pump 700 is lifted upward, the pump 700 and the attachment 200 cannot be separated in the vertical direction. Further, the fixing claw 211 is fitted in the recess 731 of the base 730. Therefore, the pump 700 cannot be rotated with respect to the attachment 200 and the rotation driving device 800. 12A and 12B, the impeller 720 and the drive head 820 are aligned coaxially, and the driven magnet 725 of the impeller 720 is magnetically coupled to the drive magnet 825 of the drive head 820. When the drive head 820 is rotated, the impeller 720 follows and rotates, and blood can flow in from the inlet port 712 and flow out from the outlet port 713.

  In order to separate the pump 700 from the attachment 200 from the state of FIG. 12A and FIG. 12B, it is possible to perform the operation reverse to the above.

  That is, first, the operation lever 227 is moved to the position of FIG. 11 so as to approach the fixing lever 247. The movable ring 220 rotates clockwise to the first position when viewed from above. Thereby, the movable nail | claw 221 and the fixed nail | claw 211 oppose an up-down direction.

  Next, the pump 700 is lifted upward while holding the position of the operation lever 227 (that is, holding the movable ring 220 in the first position). Thereby, as shown in FIG. 10, the pump 700 can be separated from the attachment 200.

  Thereafter, when the finger is released from the operation lever 227, the movable ring 220 is immediately turned to the second position by the coil spring 218 in the counterclockwise direction when viewed from above. The operation lever 227 moves to a position away from the fixed lever 247 and enters the initial state shown in FIG.

  As described above, according to the present embodiment, the base 730 of the pump 700 is inserted into the attachment 200 in a state where the movable ring 220 is rotated to the first position by operating the operation lever 227 (see FIG. 10). (See FIG. 11) Thereafter, when the finger is released from the operation lever 227, the movable ring 220 automatically rotates to the second position, and the pump 700 is attached to the attachment 200 as shown in FIGS. 12A and 12B. Complete. The inner edges of the respective central openings of the upper ring 240 and the auxiliary ring 230 of the attachment 200 align the pump 700 horizontally so that the impeller 720 is coaxial with the drive head 820. The movable claw 221 of the attachment 200 restricts the vertical movement of the pump 700 so that the base 730 of the pump 700 does not come out of the attachment 200. As a result, the driven magnet 725 of the impeller 720 and the drive magnet 825 of the drive head 820 are brought close to a desired distance and magnetically coupled. Therefore, it is possible to feed blood by rotating the impeller 720 following the rotation of the drive head 820.

  Similarly to the first embodiment, in this embodiment, once the base 730 of the pump 700 is inserted into the attachment 200 (see FIG. 11), the mounting of the pump 700 to the attachment 200 is completed (FIGS. 12A and 12B). 12B), it is not necessary to rotate the pump 700 with respect to the attachment 200 and the rotary drive device 800. Further, since the fixing claw 211 of the attachment 200 is fitted into the recess 731 of the base 730, the pump 700 cannot be rotated with respect to the attachment 200. Therefore, unlike the case where the conventional attachment 900 is used, in this embodiment, the tube connected to the inlet port 712 and the outlet port 713 is not twisted or bent in the process of mounting the pump 700 to the attachment 200. A good flow of blood in the tube can be ensured.

  As in the first embodiment, in this embodiment, as long as the movable ring 220 is positioned at the second position with the pedestal 730 inserted into the attachment 200, the state in which the pump 700 is attached to the attachment 200 is as follows. Maintained. Therefore, the movable ring 220 that includes the movable claw 221 and can be rotated constitutes a “lock mechanism” for maintaining the pump 700 properly attached.

  In order to shift to the “locked state” in which the lock mechanism functions effectively, it is necessary to rotate the movable ring 220 from the first position (“unlocked position”) to the second position (“locked position”). In the present embodiment, the movable ring 120 is constantly biased toward the second position by the coil spring 218. Therefore, in order to shift to the locked state, it is only necessary to release the operation lever 227 after inserting the base 730 of the pump 700 into the attachment 200 as shown in FIG. If the hand is released from the operation lever 227 while the movable ring 220 is in the first position, the movable ring 220 automatically moves to the second position automatically and shifts to the locked state (see FIGS. 12A and 12B). For this reason, there is no possibility of an operator's erroneous operation of forgetting to perform an operation of shifting the lock mechanism to the locked state.

  Similarly to the first embodiment, in the attachment 200 of the present embodiment, the operation lever 227 that protrudes outward from the outer peripheral edge of the movable ring 220 can be easily understood by comparing FIG. 11 and FIG. 12A. It is possible to confirm whether or not the lock state is established by the circumferential position. For example, when the radial distance from the rotation center axis of the drive head 820 to the operation lever 227 is 50 mm, the circumferential movement amount when the operation lever 227 is rotated by 15 degrees with respect to the center axis is 13 mm. Become. This is much larger than the amount of movement in the radial direction of the lock pin 910 of the conventional attachment 900 is about 5 mm. Therefore, the attachment 200 of the present embodiment can easily visually recognize whether or not it is in the locked state based on the position of the operation lever 227. Also from this point, in the present embodiment, the possibility of an erroneous operation in which the operator forgets to perform an operation of shifting the lock mechanism to the locked state is reduced.

  Even when the movable ring 220 is in the second position (see FIGS. 12A and 12B), the coil spring 218 is constantly biased so that the movable ring 220 does not rotate to the first position. Thus, the attachment 200 includes a “holding mechanism” that functions to hold the movable ring 220 in the second position (lock position). Thereby, it is possible to prevent the movable ring 220 in the second position (lock position) from unintentionally moving to the first position (non-lock position) and releasing the locked state. .

  In the second embodiment, the holding mechanism includes a coil spring 218 (biasing member) that biases the movable ring 220 toward the second position. The holding mechanism including such a biasing member is advantageous in simplifying the configuration of the holding mechanism. Further, since an independent operation for enabling the holding mechanism is not necessary, the holding mechanism can be reliably functioned.

  Although the holding mechanism of the first embodiment includes an engagement structure (cam shaft 117) that engages the movable ring 120, the holding mechanism of the first embodiment does not include an engagement structure. For this reason, in order to release the locked state, an operation for releasing the engagement is unnecessary, and the operation lever 227 may simply be rotated against the urging force of the coil spring 218. Therefore, it is easy to switch between the locked state and the unlocked state (the state in which the locked state is released).

  In a state where the pedestal 730 of the pump 700 is inserted into the attachment 200, the fixing claw 211 of the fixing ring 210 is fitted into the recess 731 of the pedestal 730. For this reason, the pump 700 cannot be rotated with respect to the attachment 200 and the rotation drive device 800. Therefore, in the locked state (see FIGS. 12A and 12B), the pump 700 does not rotate with respect to the attachment 200 and the movable claw 221 does not come out of the groove 733.

  Similar to the attachment 100 of the first embodiment, the attachment 200 of this embodiment can be used in place of the conventional attachment 900. The rotary drive device 800 (particularly its upper housing 801) and the pump 700 that have been used in the past can be used continuously without any design deformation. Therefore, it is excellent in cost effectiveness.

(Embodiment 3)
FIG. 13 is a perspective view of an attachment 300 according to Embodiment 3 of the present invention. As with the attachments 100 and 200 of the first and second embodiments, the attachment 300 of the third embodiment is replaced with the rotation driving device 800 instead of the above-described conventional attachment 900, and the central axis 800a of the rotation driving device 800 (see FIG. 18). ) And coaxial. And the pump 700 mentioned above can be attached to the attachment 300 so that attachment or detachment is possible. The same members as those shown in FIGS. 1 to 6B relating to the first embodiment and FIGS. Similar to the conventional attachment 900, the attachment 300 has an annular shape with an opening at the center so that the drive head 820 (see FIG. 18) and the head cover 805 of the rotary drive device 800 can be surrounded.

  FIG. 14 is an exploded perspective view of the attachment 300 as viewed from above. The attachment 300 includes a movable ring 320 and a fixed ring 310, both of which have an annular shape, in this order from the upper housing 801 side of the rotary drive device 800.

  In the center of the movable ring 320, a circular opening (through hole) coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is formed. Three movable claws 321 protrude from the inner peripheral surface 322 of the opening toward the inside (that is, the drive head 820). The movable claws 321 are arranged at intervals of 120 degrees. The movable claw 321 is a thin plate-like object parallel to the horizontal surface, and the tip of the movable claw 321 viewed from above has a semicircular shape.

  An operation lever 327 projects outward from the outer peripheral edge of the movable ring 320 along the radial direction.

  Three guide holes 323 are formed in the movable ring 320. The guide hole 323 is a through hole that penetrates the movable ring 320 in the vertical direction. The guide hole 323 extends along an arc that is coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800. One of the three guide holes 323 has a longer circumferential length than the other two. A cylindrical sleeve 326 is inserted into the guide hole 323. Two sleeves 326 are inserted into the long guide hole 323, and one sleeve 326 is inserted into the short guide hole 323.

  A circular opening (through hole) coaxial with the drive head 820 (see FIG. 18) of the rotary drive device 800 is formed in the center of the fixing ring 310. The diameter of the opening is preferably the same as or slightly smaller than the diameter of the opening of the movable ring 320. A guide surface 341 is formed at the edge of the opening on the upper surface of the fixing ring 310. The guide surface 341 is a conical surface (taper surface) that is coaxial with the drive head 820 and descends downward as it approaches the inner side (drive head 820).

  The fixing ring 310 includes a cylindrical spacer cylinder 314 extending downward from the inner edge of the fixing ring 310. Three fixed claws 311 protrude from the inner peripheral surface 312 of the spacer cylinder 314 toward the inside (that is, the drive head 820). The fixed claws 311 are arranged at intervals of 120 degrees. The tip of the fixed claw 311 viewed from above has a semicircular shape having substantially the same radius as the movable claw 321.

  Three notches 315 are formed in the spacer cylinder 314. The notch 315 extends from the lower end of the spacer cylinder 314 upward by a predetermined length. The notches 315 are arranged at intervals of 120 degrees and are positioned approximately in the middle of the fixing claws 311 adjacent in the circumferential direction.

  The four through holes 313 penetrate the fixing ring 310 in the vertical direction.

  On the upper housing 801 (see FIG. 13) of the rotary drive device 800, the movable ring 320 and the fixed ring 310 are stacked in this order coaxially with the drive head 820. Then, the fixing screw 349 is inserted into the through hole 313. The fixing screw 349 passes through the through hole 313 and the sleeve 326 inserted into the guide hole 323 in order, and is screwed into a screw hole (female screw, not shown) formed in the upper housing 801. Thus, the attachment 300 is attached to the upper housing 801 of the rotary drive device 800 as shown in FIG.

  The spacer cylinder 314 of the fixed ring 310 is inserted into the central opening of the movable ring 320. The lower end of the spacer cylinder 314 is in contact with the upper surface of the upper housing 801. The upper end of the sleeve 326 contacts the lower surface of the fixing ring 310, and the lower end of the sleeve 326 contacts the upper surface of the upper housing 801. Thus, the spacer cylinder 314 and the sleeve 326 maintain a constant vertical distance between the fixing ring 310 and the upper housing 801. For this reason, the movable ring 320 can rotate in the circumferential direction around the central axis 800 a of the rotation driving device 800 with respect to the fixed ring 310. The movable ring 320 can be rotated using an operation lever 327 protruding from the movable ring 320. On the other hand, the fixing ring 310 cannot move with respect to the upper housing 801.

  The movable claw 321 of the movable ring 320 protrudes inward through a notch 315 formed in the spacer cylinder 314. When the movable ring 320 rotates, the movable claw 321 moves in the circumferential direction within the notch 315. In the vertical direction, the fixed claw 311 is located closer to the upper housing 801 than the movable claw 321.

  The rotatable angle range of the movable ring 320 is defined by the circumferential ends of the guide hole 323 coming into contact with the sleeve 326. In the present embodiment, the rotatable angle range of the movable ring 320 is about 15 degrees.

  A method for attaching / detaching the pump 700 to / from the attachment 300 of the present embodiment configured as described above will be described.

  First, as shown in FIG. 15, the pump 700 is opposed to the attachment 300. The pump 700 is the same as that described in FIGS. 19A and 19B. Although not shown, a tube constituting an extracorporeal blood circulation circuit is already connected to the inlet port 712 and the outlet port 713. The rotation driving device 800 is fixed at a predetermined position by a jig (not shown). In the initial state shown in FIG. 15, the movable ring 320 is rotated in the clockwise direction as viewed from above to the maximum of its rotatable angle range. This position of the movable ring 320 is referred to as a “first position”.

  Next, the pump 700 is brought close to the attachment 300. The base 730 of the pump 700 is inserted into the central opening of the fixing ring 310 of the attachment 300. An inclined guide surface 341 guides the pedestal 730 into the opening. The pump 700 is slightly rotated in the circumferential direction, and the movable claw 321 and the fixed claw 311 of the attachment 300 are sequentially fitted into the recess 731 (see FIGS. 19A and 19B) of the base 730 of the pump 700.

  In the present embodiment, the movable claw 321 and the fixed claw 311 are arranged at different positions in the circumferential direction. However, when the movable ring 320 is in the first position, the angle formed by the fixed claw 311 and the movable claw 321 adjacent in the circumferential direction with respect to the central axis 800a is the center of the recess 731 formed in the base 730 of the pump 700. The circumferential positions of the movable claw 321 and the fixed claw 311 are set so as to be an integral multiple of the pitch angle (30 degrees in this embodiment) with respect to the shaft 800a. Therefore, the movable claw 321 and the fixed claw 311 are fitted into different concave portions 731 of the base 730. Since the radius of the semi-cylindrical surface of the dummy recess 732 is smaller than the semicircular radius at the tips of the movable claw 321 and the fixed claw 311, the movable claw 321 and the fixed claw 311 cannot be fitted into the dummy recess 732. . The pedestal 730 can be inserted into the attachment 300 until the lower surface of the pedestal 730 contacts the upper housing 801.

  FIG. 16 is a perspective view showing a state where the base 730 of the pump 700 is inserted into the attachment 300 to the deepest. The operating lever 327 is in the same position as in FIG. 15, so the movable ring 320 is still in the first position. Although not shown, the groove 733 (see FIGS. 19A and 19B) formed in the base 730 coincides with the movable claw 321 in the vertical direction. When the pump 700 is lifted upward in the state of FIG. 16, the pump 700 can be separated from the attachment 300. The inner edge of the central opening of the fixing ring 310 and the inner peripheral surface 312 of the spacer cylinder 314 are in contact with the outer peripheral surface of the base 730 of the pump 700, thereby positioning the pump 700 in the horizontal direction. Therefore, the drive head 820 and the impeller 720 are aligned coaxially.

  Next, as shown in FIG. 17A, the operation lever 327 is rotated in the counterclockwise direction (arrow R3) as viewed from above to the maximum possible angle range of the movable ring 320. FIG. 17B shows the attachment 300 in which the pump 700 is not shown and is in the same state as FIG. 17A. By rotating the operation lever 327, the movable ring 320 rotates and the movable claw 321 moves in the circumferential direction. At this time, the fixed claw 311 is not displaced. Since the fixed claw 311 is fitted in the recess 731 of the base 730, the pump 700 does not rotate even if the movable ring 320 rotates. Accordingly, the movable claw 321 moves from the recess 731 into the groove 733 (see FIGS. 19A and 19B). This position of the movable ring 320 is referred to as a “second position”. Thus, the mounting of the pump 700 to the attachment 100 is completed.

  In the state of FIGS. 17A and 17B, the movable claw 321 is fitted in the groove 733 of the base 730, so that the pump 700 is positioned in the vertical direction with respect to the attachment 300 and the rotation driving device 800. Therefore, the pump 700 cannot be separated from the attachment 300 even if the pump 700 is lifted upward. The fixing claw 311 is fitted in the recess 731 of the base 730. Therefore, the pump 700 cannot be rotated with respect to the attachment 300 and the rotation driving device 800. The impeller 720 and the drive head 820 are aligned coaxially, and the driven magnet 725 of the impeller 720 is magnetically coupled to the drive magnet 825 of the drive head 820. When the drive head 820 is rotated, the impeller 720 follows and rotates, and blood can flow in from the inlet port 712 and flow out from the outlet port 713.

  In order to separate the pump 700 from the attachment 300 from the state of FIG. 17A and FIG. 17B, it is possible to perform roughly the operation reverse to the above. That is, first, the operation lever 327 is rotated in the clockwise direction as viewed from above to the maximum of the rotatable angle range of the movable ring 320. As a result, the state shown in FIG. 16 is obtained. Thereafter, the pump 700 is lifted upward. Thereby, as shown in FIG. 15, the pump 700 can be separated from the attachment 300.

  As described above, according to the present embodiment, as shown in FIGS. 17A and 17B, if the base 730 of the pump 700 is inserted into the attachment 300 and the movable ring 320 is rotated to the second position. The mounting of the pump 700 to the attachment 300 is completed. The inner edge of the central opening of the fixing ring 310 of the attachment 300 and the inner peripheral surface 312 of the spacer cylinder 314 align the pump 700 in the horizontal direction so that the impeller 720 is coaxial with the drive head 820. The movable claw 321 of the attachment 300 restricts the vertical movement of the pump 700 so that the base 730 of the pump 700 does not come out of the attachment 300. As a result, the driven magnet 725 of the impeller 720 and the drive magnet 825 of the drive head 820 are brought close to a desired distance and magnetically coupled. Therefore, it is possible to feed blood by rotating the impeller 720 following the rotation of the drive head 820.

  When the pump 700 is attached to the attachment 300, once the pedestal 730 of the pump 700 is once inserted into the attachment 300 (see FIG. 16), the attachment of the pump 700 to the attachment 300 is completed (see FIGS. 17A and 17B). In the meantime, it is not necessary to rotate the pump 700 with respect to the attachment 300 and the rotation driving device 800. Further, when the pedestal 730 is inserted into the attachment 300, the fixing claw 311 of the attachment 300 is fitted into the recess 731 of the pedestal 730, so that the pump 700 cannot be rotated with respect to the attachment 300. Therefore, unlike the case where the conventional attachment 900 is used, in this embodiment, the tube connected to the inlet port 712 and the outlet port 713 is not twisted or bent in the process of mounting the pump 700 to the attachment 300. A good flow of blood in the tube can be ensured.

  As long as the movable ring 320 is in the second position with the base 730 inserted into the attachment 300, the state where the pump 700 is attached to the attachment 300 is maintained. Therefore, the movable ring 320 that includes the movable claw 321 and is rotatable constitutes a “lock mechanism” for maintaining the pump 700 properly attached.

  In order to shift to the “locked state” in which the locking mechanism has functioned effectively, the operation ring 327 is used to move the movable ring 320 from the first position (“unlocked position”, see FIG. 16) to the second position (“locked”). It is necessary to rotate it to “position”, see FIGS. 17A and 17B). In the present embodiment, as can be easily understood by comparing FIG. 16 and FIG. 17A, is the locked state depending on the circumferential position of the operation lever 327 protruding outward from the outer peripheral edge of the movable ring 320? You can check whether or not. For example, when the radial distance from the rotation center axis of the drive head 820 to the operation lever 327 is 50 mm, the circumferential movement amount when the operation lever 327 is rotated by 15 degrees with respect to the center axis is 13 mm. Become. This is much larger than the amount of movement in the radial direction of the lock pin 910 of the conventional attachment 900 is about 5 mm. Therefore, the attachment 300 according to the present embodiment can easily visually recognize whether or not it is in the locked state based on the position of the operation lever 327. For this reason, the possibility of an erroneous operation in which the operator forgets to perform an operation of shifting the lock mechanism to the locked state is reduced.

  In a state where the pedestal 730 of the pump 700 is inserted into the attachment 300, the fixing claw 311 of the fixing ring 310 is fitted into the recess 731 of the pedestal 730. For this reason, the pump 700 cannot be rotated with respect to the attachment 300 and the rotation drive device 800. Therefore, in the locked state (see FIGS. 17A and 17B), a situation in which the pump 700 rotates with respect to the attachment 300 and the movable claw 321 comes out of the groove 733 does not occur.

  Similar to the fixing lever 247 of the second embodiment, a fixing lever that protrudes outward along the radial direction may be provided on the fixing ring 310. Thereby, the operation of rotating the operation lever 327 is facilitated, and the position of the operation lever 327 can be easily determined.

  Unlike the first and second embodiments, in the third embodiment, the fixed ring 310 is disposed above the movable ring 320 (on the pump 700 side). Therefore, a guide surface 341 for guiding the base 730 of the pump 700 into the attachment 300 can be provided on the fixing ring 310. For this reason, it is not necessary to provide a stationary ring such as the upper rings 140 and 240 of the first and second embodiments separately from the fixing ring 310. Further, the fixing ring 310 can have a function (axis alignment function) for aligning the pump 700 in the horizontal direction so that the impeller 720 of the pump 700 and the drive head 820 of the rotary drive device 800 are coaxial. However, an upper ring having a guide surface 341 and having an axis alignment function may be provided above the fixing ring 310 (on the pump 700 side).

  Similar to the attachments 100 and 200 of the first and second embodiments, the attachment 300 of the present embodiment can also be used in place of the conventional attachment 900. The rotary drive device 800 (particularly its upper housing 801) and the pump 700 that have been used in the past can be used continuously without any design deformation. Therefore, it is excellent in cost effectiveness.

  The above first to third embodiments are merely examples. The present invention is not limited to the first to third embodiments, and can be changed as appropriate.

  The function of aligning the pump 700 in the horizontal direction (axis alignment function) so that the impeller 720 of the pump 700 and the drive head 820 of the rotary drive device 800 are coaxial, in the second embodiment, the opening of the upper ring 240 and the auxiliary ring 233 The inner peripheral edge of However, the axis alignment function may be assigned only to the upper ring 240 as in the first embodiment, or may be assigned only to the auxiliary ring 233. Alternatively, in the first and second embodiments, the above axial alignment function may be performed on the inner peripheral surfaces 112 and 212 of the openings of the fixed rings 110 and 210 or the inner peripheral surfaces 122 and 222 of the openings of the movable rings 120 and 220. Good. In this case, the upper rings 140 and 240 may be omitted. In general, it is preferable that the axis alignment function is carried by a ring (that is, a fixed ring or an upper ring) that does not move with respect to the rotary drive device 800 from the viewpoint of axis alignment accuracy.

  In the second embodiment, the outer diameter of the movable ring 220 may be increased and the guide hole 235 may be formed in the movable ring 220. In this case, the auxiliary ring 230 can be omitted.

  The operation levers 127 and 227 do not need to be separate members from the movable rings 120 and 220. Like the operation lever 327 of the third embodiment, the operation protrusions 125 and 225 provided integrally with the movable rings 120 and 220 may be operation levers. In this case, the operation levers 127 and 227 and the fixing screws 128 and 228 which are separate members from the movable rings 120 and 220 can be omitted.

  In the present invention, the configuration of the holding mechanism for maintaining the locked state is not limited to the first and second embodiments. For example, when the movable rings 120 and 220 are in the second position (lock position), they are engaged with each other (for example, a convex portion and a concave portion into which the convex portion is inserted, or a convex shape that can be engaged with each other). And the convex portion) may be provided on the rotatable member (that is, the movable rings 120 and 220, the auxiliary ring 230) and the fixed member (that is, the fixed rings 110 and 210, the upper rings 140 and 240). When the movable rings 120 and 220 are rotated to reach the second position, the engagement shape is engaged, and the rotation of the movable rings 120 and 220 to the first position is restricted. Such a holding mechanism is advantageous for reducing the number of parts constituting the attachment and for simplifying the structure of the attachment.

  The attachment 300 of Embodiment 3 can be provided with a holding mechanism for maintaining the locked state. In this case, the structure of the holding mechanism is arbitrary. For example, the holding mechanism may have an engaging member that engages with the movable ring as in the first embodiment, and the movable ring is in the second position as in the second embodiment. You may have the biasing member biased toward, or you may have said engagement shape.

  Alternatively, in the first and second embodiments, a holding mechanism for maintaining the locked state may be omitted. Even if the holding mechanism is omitted, the locked state is maintained unless an external force that rotates the movable rings 120 and 220 from the second position to the first position acts on the operation levers 127 and 227.

  In the second embodiment, the urging force of the coil spring 218 is applied to the movable ring 220 via the slider 216. However, one end of the coil spring 218 may be brought into direct contact with the movable ring 220 without using the slider 216. The number of coil springs 218 and sliders 216 need not be three as in the second embodiment, but may be two or less (for example, one), or may be four or more. The coil spring 216 may be a tension coil spring instead of a compression coil spring.

  The number of the fixed claws 111, 211, 311 and the number of the movable claws 121, 221, 321 need not be three as in the first to third embodiments. Further, the number of the fixed claws 111, 211, 311 and the number of the movable claws 121, 221, 321 do not have to be the same. The number of the fixed claws 111, 211, 311 and / or the number of the movable claws 121, 221, 321 may be two or less, or may be four or more. However, in order to position the pump 700 at a predetermined position in the vertical direction without tilting the rotating shaft 721 of the impeller 720, the number of the movable claws 121, 221 and 321 is preferably three. When the number of the fixed claws 111, 211, 311 and / or the number of the movable claws 121, 221, 321 is plural, the fixed claws 111, 211, 311 and / or the movable claws 121, 221, 321 are in relation to the central axis 800a. Are preferably arranged at equiangular intervals.

  In the first and second embodiments, when the movable rings 120 and 220 are in the first position, the fixed claws 111 and 211 and the movable claws 121 and 221 overlap each other in the vertical direction. This is advantageous in that the attachments 100 and 200 can be easily designed and assembled. However, the present invention is not limited to this. If the fixed claws 111, 211 and the movable claws 121, 221 can be fitted into the different recesses 731 of the pedestal 730 when the movable rings 120, 220 are in the first position, the pedestal 730 is inserted into the attachment. Can do. For example, as in the third embodiment, when the movable rings 120 and 220 are in the first position, the movable claws 121 and 221 have a pitch angle of the recess 731 with respect to the fixed claws 111 and 211 (the first embodiment described above). The position may be shifted by an integer multiple of 30 degrees in 2).

  In the third embodiment, when the movable ring 320 is in the first position, the fixed claw 311 and the movable claw 321 may be configured to overlap in the vertical direction as in the first and second embodiments.

  In the first to third embodiments, the dummy recess 732 is formed in the pedestal 730 of the pump 700. However, the attachment of the present invention can be mounted with a pump in which the dummy recess 732 is not formed.

  In the first to third embodiments, the case where the liquid feeding pump is a turbo blood pump in which the impeller (rotor) rotates in the pump chamber has been described. However, the attachment of the present invention can be applied to any liquid feeding pump other than the turbo blood pump. For example, the present invention can also be applied to a so-called roller pump in which a rotor including a plurality of rollers that move while rolling on a tube while compressing a flexible tube is driven by a drive head. The liquid sent by the liquid feeding pump is not limited to blood, but may be a liquid or a chemical solution containing a nutrient (for example, enteral nutrient).

  INDUSTRIAL APPLICABILITY The present invention can be used as an attachment for detachably mounting a liquid feed pump on a rotary drive device. The type of the liquid feeding pump is not limited, but a pump used for medical use is preferable, and a blood pump for feeding blood is particularly preferable.

100, 200, 300 Attachment 110, 210, 310 Fixed ring 111, 211, 311 Fixed claw 120, 220, 320 Movable ring 121, 221, 321 Movable claw 127, 227, 327 Operation lever 140, 240 Upper ring (axis alignment member) )
117 Cam shaft (engaging member)
218 Coil spring (biasing member)
700 Liquid feed pump (turbo blood pump)
711 Pump chamber 720 Impeller (rotor)
722 Vane 730 Pedestal 731 Recess 733 Groove 800 Rotation drive device 800a Center axis 820 of the rotation drive device Drive head

Claims (18)

An attachment that can be attached to a rotational drive device having a drive head for rotationally driving a liquid feed pump,
The pump includes an annular pedestal at its lower end, and the outer peripheral surface of the pedestal is a cylindrical surface coaxial with a rotor built in the pump,
A concave portion and a groove connected to the concave portion are formed on the outer peripheral surface of the pedestal,
The recess extends in parallel with the rotation axis direction of the rotor,
The groove extends along a circumferential direction of the pedestal,
The pump can be detachably attached to the attachment,
The attachment has an annular shape surrounding the drive head;
The attachment includes a fixed ring and a movable ring arranged coaxially,
The fixing ring includes a fixing claw protruding inward from an inner peripheral surface of the fixing ring,
The movable ring includes a movable claw projecting inward from an inner peripheral surface of the movable ring, and an operation lever projecting outward from an outer peripheral edge of the movable ring,
The movable ring can be rotated with respect to the fixed ring between a first position and a second position by operating the operation lever ,
When the movable ring is in the first position, the pedestal can be fitted into the attachment, and the fixed claw and the movable claw can be fitted into the recess of the pedestal,
When the movable ring is rotated to the second position in a state where the pedestal is fitted in the attachment, the movable claw is fitted in the groove .   The attachment according to claim 1, further comprising a holding mechanism for holding the movable ring in the second position.   3. The holding mechanism includes an engaging member that engages with the movable ring at the second position so that the movable ring at the second position cannot be rotated to the first position. Attachment described in.   The engagement member engages with the movable ring so that the movable ring cannot be rotated as soon as the movable ring rotates from the first position to the second position. Attachment.   The attachment according to claim 2, wherein the holding mechanism includes a biasing member that biases the movable ring toward the second position.   When the movable ring is in the first position, the movable claw overlaps the fixed claw in the vertical direction, and when the movable ring is in the second position, the movable claw is circumferential with respect to the fixed claw. The attachment according to any one of claims 1 to 5, wherein the attachment is displaced.   The attachment according to any one of claims 1 to 6, further comprising an axis alignment member that aligns the pump so that a rotor of the pump is coaxial with the drive head.   The attachment according to claim 7, wherein the shaft alignment member is an upper ring disposed on a side opposite to the rotation driving device with respect to the fixed ring and the movable ring.   The attachment according to claim 7, wherein the shaft alignment member is the fixing ring.   The attachment according to any one of claims 1 to 9, wherein the fixed claw is disposed closer to the rotation driving device than the movable claw.   The attachment according to any one of claims 1 to 10, wherein the fixed ring is disposed closer to the rotary drive device than the movable ring.   The attachment according to any one of claims 1 to 10, wherein the movable ring is disposed closer to the rotation drive device than the fixed ring. The attachment according to any one of claims 1 to 12, wherein the number of the fixed claws and the number of the movable claws are the same.   The attachment according to any one of claims 1 to 13, wherein the number of the movable claws is three. The outer peripheral surface of the front Symbol pedestal attachment according to any one of 請 Motomeko 1 to 14 and a plurality of said recesses and said grooves of several are formed at equal angular intervals with respect to the rotational axis of the rotor . The attachment according to any one of claims 1 to 15, wherein when the fixed claw is fitted in the recess of the pedestal, the fixed claw restricts the pedestal from rotating with respect to the attachment. The attachment according to any one of claims 1 to 16, wherein when the movable claw is fitted in the groove, the movable claw restricts the pedestal from coming out of the attachment.   The attachment according to any one of claims 1 to 17, wherein the pump is a turbo blood pump in which an impeller provided with a plurality of vanes rotates in a pump chamber.

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