Blood purification device

Abstract

To provide a blood purification device including a magnetic sensor capable of improving detection accuracy for a closed state of a blood pump cover while suppressing an increase in the cost of the blood purification device.SOLUTION: An access cover opening and closing detection device 50 in a blood purification device 1 includes: a magnet 51 provided in an access cover 21; a magnetic sensor 54 provided in a body part 15; a base 53 provided in the body part 15 for holding the magnetic sensor 54 on a surface side of a magnet 51 side; a magnetic catch 52 provided in the body part 15 for transmitting magnetic fluxes of the magnet 51 to the magnetic sensor 54; and a back yoke 55 provided on a reverse surface opposite to the magnetic sensor 54 of the base 53 for increasing magnetic flux density guided by the magnetic catch 52.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a blood purification device.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2023-160392 (Patent Document 1) discloses a blood purification device having a blood pump. An opening / closing cover for the blood pump for loading a pump tube is attached to the main body so as to be openable and closable.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When operating the blood purification device, the opening / closing cover needs to be closed at a predetermined position. In the control of the blood purification device, the blood purification device is operated by detecting that the opening / closing cover is in a closed state. A detection sensor using a magnetic sensor is used for the opening / closing cover to detect the closed state. However, in recent years, events have been reported in which the closed state of the opening / closing cover is not detected even when the opening / closing cover is in a closed state.

[0005] In order to reliably detect the closed state of the opening / closing cover of the blood pump, it is conceivable to use a highly accurate magnetic sensor, but this will lead to an increase in the cost of the blood purification device. Also, in existing blood purification devices, it is not easy to replace them with highly accurate magnetic sensors.

[0006] The present disclosure has been made in view of the above problems, and an object thereof is to provide a blood purification device having a magnetic sensor capable of improving the detection accuracy of the closed state of an opening / closing cover of a blood pump while suppressing an increase in the cost of the blood purification device.

Means for Solving the Problems

[0007] [1] A blood purification device according to the present disclosure includes a blood purifier, a blood pump capable of transporting blood in the tube to the blood purifier by attaching a flexible tube connected to the blood purifier, a main body portion that houses the blood pump, an opening / closing cover provided on the main body portion and selectively provided with an open state in which the blood pump is exposed and a closed state in which the blood pump is not exposed, and an opening / closing cover opening / closing detection device for detecting the open state and the closed state of the opening / closing cover is provided between the main body portion and the opening / closing cover. The opening / closing cover opening / closing detection device includes a magnet provided on the opening / closing cover, a magnetic sensor provided on the main body portion, a base provided on the main body portion for holding the magnetic sensor on the surface side on the magnet side, a magnetic catch provided on the main body portion for transmitting the magnetic flux of the magnet to the magnetic sensor, and a back yoke provided on the back surface of the base on the side opposite to the magnetic sensor for increasing the magnetic flux density guided by the magnetic catch.

[0008] [2] The blood purification device according to [1], wherein the back yoke is arranged so as to include at least the magnetic sensor when viewed from the back surface of the base.

[0009] [3] The blood purification device according to [2], wherein the back yoke has an extending portion extending in parallel with the magnetic catch.

Advantages of the Invention

[0010] It is possible to provide a blood purification device having a magnetic sensor capable of improving the detection accuracy of the closed state of an opening / closing cover of a blood pump while suppressing an increase in the cost of the blood purification device.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present technology will be described. The same or corresponding parts may be denoted by the same reference numerals, and the description thereof may not be repeated.

[0013] In each of the embodiments described below, when referring to the number, amount, dimensions, etc., unless otherwise specified, the scope of the present technology is not necessarily limited to such number, amount, dimensions, etc. In the following embodiments, each component is not necessarily essential for the present technology, unless otherwise specified. The same parts and corresponding parts may be denoted by the same reference numerals, and the overlapping description may not be repeated. It is initially planned to use the configurations in the embodiments in appropriate combinations.

[0014] In this specification, the descriptions of "comprise", "include", and "have" are in an open-ended format. That is, when a certain configuration is included, other configurations other than the said configuration may or may not be included. Also, this technology is not necessarily limited to those that necessarily exhibit all the effects mentioned in this embodiment mode.

[0015] FIG. 1 is a schematic circuit diagram showing an extracorporeal circulation circuit in a blood purification device according to an embodiment mode, and FIG. 2 is a perspective view showing a blood purification device according to the embodiment mode. As shown in FIGS. 1 and 2, the blood purification device 1 according to an embodiment of the present disclosure is specifically a blood purification device used for Continuous Renal Replacement Therapy (CRRT). However, the blood purification device 1 may be a blood purification device used for any one of continuous hemodiafiltration (CHDF), continuous hemofiltration (CHF), continuous hemodialysis (CHD), and Slow Continuous UltraFiltration (SCUF), or may be a blood purification device used for general Renal Replacement Therapy (RRT).

[0016] The blood purification device 1 includes a main body 15, and a blood purifier 10 and a blood pump 20 housed in the main body 15. The blood pump 20 includes an opening / closing cover 21 for the blood pump. The opening / closing cover 21 is provided so that an open state (see FIG. 4) in which the blood pump 20 is exposed and a closed state (see FIG. 3) in which it is not exposed can be selectively set.

[0017] The blood purifier 10 contains, for example, a semipermeable membrane made of a hollow fiber membrane inside. The blood purifier 10 is attached to the main body 15. Flexible tubes 2 are connected to the blood inlet side and the blood outlet side of the blood purifier 10, respectively.

[0018] The main body portion 15 has a front surface 16, an upper surface 17, and a placement surface 18. The upper surface 17 is connected to the front surface 16. Among the upper surface 17, the portion located near the front surface 16 is inclined downward toward the front surface 16. In the present embodiment, the placement surface 18 is constituted by the lower ends of a plurality of casters. The "horizontal plane" in this specification is a plane parallel to the placement surface 18.

[0019] The blood pump 20 is a so-called roller pump. The blood pump 20 can transport the blood in the tube 2 to the blood purifier 10 by attaching a flexible tube 2 (specifically, the tube 2 connected to the blood inlet side of the blood purifier 10) connected to the blood purifier 10.

[0020] The blood pump 20 is provided on the main body portion 15. By opening the opening / closing cover 21 (see FIG. 4), the flexible tube 2 can be attached and detached. When the blood purifier 10 is in operation, the opening / closing cover 21 is in a closed state (see FIG. 3). Specifically, the blood pump 20 is provided on the main body portion 15 straddling the front surface 16 and the upper surface 17. The blood pump 20 is located more than 800 mm away from the placement surface 18 of the main body portion 15 in the vertical direction Y.

[0021] [Opening / Closing Cover Opening / Closing Detection Device 50] Next, with reference to FIGS. 3 to 5, the opening / closing cover opening / closing detection device 50 provided in the blood purification device 1 having the above configuration will be described. FIG. 3 is a perspective view showing the appearance of the opening / closing cover 21, FIG. 4 is a perspective view showing the appearance of the opening / closing cover 21 in an open state (open state), and FIG. 5 is a side view showing the schematic configuration of the opening / closing cover opening / closing detection device 50.

[0022] Referring to FIGS. 3 and 4, the blood purification device 1 includes a resin opening / closing cover 21 provided in the main body 15 (see FIG. 2), and is selectively provided with an open state (see FIG. 4) in which the blood pump 20 is exposed and a closed state (see FIG. 3) in which it is not exposed. Specifically, the opening / closing cover 21 is pivotally supported on the base portion 41 on the main body 15 side about a rotation axis 23, and a support portion 22 pivotally supported on the rotation axis 23 is fixed to the inner surface side of the opening / closing cover 21.

[0023] On the front side (opposite side to the support portion 22) of the inner surface side of the opening / closing cover 21, a magnet base 25 for holding a cylindrical magnet 51 constituting the opening / closing cover opening / closing detection device 50 is provided. A blood pump 20 and a drive portion 42 for driving the blood pump 20 are attached to the base portion 41.

[0024] In a state where the opening / closing cover 21 is closed toward the base portion 41 side (closed state in which the blood pump 20 is not exposed), a magnetic catch 52 constituting the opening / closing cover opening / closing detection device 50 is provided at a position facing the magnet 51. In the present embodiment, the magnetic catch 52 is embedded in the resin base portion 41. The magnetic catch 52 has a cylindrical outer shape and has a function of transmitting the magnetic flux emitted from the magnet 51 to a magnetic sensor 54 described later.

[0025] The magnetic sensor 54 is fixed on the surface of a base 53 having the surface on the magnet 51 side as the front side. The base 53 is fixed to the base portion 41. For the magnetic sensor 54, for example, a Hall element may be used.

[0026] Referring to FIG. 5, the magnet 51, the magnetic catch 52, the base 53, and the magnetic sensor 54 described above constitute the opening / closing cover opening / closing detection device 50. Further, in the opening / closing cover opening / closing detection device 50 of the present embodiment, a back yoke 55 for increasing the magnetic flux density guided by the magnetic catch 52 is provided on the back surface of the base 53 opposite to the magnetic sensor 54.

[0027] The back yoke 55 is provided so as to cover the entire back surface of the base 53 so as to include the magnetic sensor 54 when viewed from the back surface of the base 53. For the back yoke 55, for example, a cold-rolled steel sheet (SPCC) with a plate thickness of 0.10 mm to 3.2 mm can be used. Alternatively, an equivalent steel sheet may be used.

[0028] In this way, by providing the back yoke 55 on the back surface of the magnetic sensor 54, the magnetic flux from the magnetic catch 52 can be corrected, and the magnetic flux density reaching the magnetic sensor 54 can be increased.

[0029] As a result, it becomes possible to accurately detect the closed state of the opening / closing cover 21 by the opening / closing cover opening / closing detection device 50, and while suppressing an increase in the cost of the blood purification device 1, it is possible to improve the detection accuracy of the closed state of the opening / closing cover 21 of the blood pump 20.

[0030] (Other embodiments) With reference to FIGS. 6 and 7, the configuration of the opening / closing cover opening / closing detection device according to another embodiment will be described. FIG. 6 is a side view showing a schematic configuration of an opening / closing cover opening / closing detection device 50A according to another embodiment, and FIG. 7 is a side view showing a schematic configuration of an opening / closing cover opening / closing detection device 50B according to still another embodiment.

[0031] In the opening / closing cover opening / closing detection device 50A shown in FIG. 6, the back yoke 55A is arranged so as to include at least the magnetic sensor 54 when viewed from the back surface of the base 53, and the back yoke 55A is not provided so as to cover the entire back surface of the base 53. Even with this configuration, it can be expected that the magnetic flux from the magnetic catch 52 is corrected, the magnetic flux density reaching the magnetic sensor 54 is increased, and the closed state of the opening / closing cover 21 is accurately detected by the opening / closing cover opening / closing detection device 50.

[0032] In the opening / closing cover opening / closing detection device 50B shown in FIG. 7, the back yoke 55B includes a first back yoke 55a arranged so as to include at least the magnetic sensor 54 when viewed from the back surface of the base 53, and a second back yoke 55b constituting an extending portion extending in parallel with the magnetic catch 52.

[0033] Even with this configuration, it is possible to expect that the magnetic flux from the magnetic catch 52 is corrected by the first back yoke 55a and the second back yoke 55b, the magnetic flux density reaching the magnetic sensor 54 is increased, and the closed state of the opening / closing cover 21 is accurately detected by the opening / closing cover opening / closing detection device 50.

[0034] The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0035] 1 Blood purification device, 2 Tube, 10 Blood purifier, 15 Main body, 16 Front surface, 17 Upper surface, 18 Placing surface, 20 Blood pump, 21 Opening / closing cover, 22 Support portion, 23 Rotation axis, 25 Magnet base, 41 Base portion, 42 Driving portion, 50, 50A, 50B Opening / closing cover opening / closing detection device, 51 Magnet, 52 Magnetic catch, 53 Base, 54 Magnetic sensor, 55, 55A, 55B Back yoke, 55a First back yoke, 55b Second back yoke.

Claims

1. A blood purifier, a blood pump capable of transporting the blood in the tube to the blood purifier by attaching a flexible tube connected to the blood purifier, a main body portion that houses the blood pump, an opening / closing cover provided on the main body portion and selectively provided with an open state in which the blood pump is exposed and a closed state in which the blood pump is not exposed, A blood purification device comprising: An opening / closing cover opening / closing detection device for detecting the open state and the closed state of the opening / closing cover is provided between the main body portion and the opening / closing cover, The opening / closing cover opening / closing detection device, a magnet provided on the opening / closing cover, a magnetic sensor provided on the main body portion, a base provided on the main body portion and holding the magnetic sensor on the surface side on the magnet side, a magnetic catch provided on the main body portion and transmitting the magnetic flux of the magnet to the magnetic sensor, a back yoke provided on the back surface of the base opposite to the magnetic sensor and increasing the magnetic flux density guided by the magnetic catch, including A blood purification device.

2. The back yoke is arranged so as to include at least the magnetic sensor when viewed from the back surface of the base, The blood purification device according to claim 1.

3. The back yoke, has an extending portion extending in parallel with the magnetic catch, The blood purification device according to claim 2.

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