Medical filter device

Abstract

To provide a medical filter device and a medical joint that can suppress damage to the joint due to misalignment. [Solution] The medical filter device 1 comprises a filter 2 having a first joint 11 for connecting a flow path through which the liquid to be filtered flows, a holder 3 having a second joint 12 to which the flow path is connected, and a holding mechanism 33 that holds the tip ends of the first joint 11 and the second joint 12 together when the filter 2 is installed, wherein one of the first and second joints 11, 12 has a guide projection 13 that protrudes toward the tip, and the other of the first and second joints 11, 12 has a guide groove 14 that guides the guide projection 13.

Description

【Technical Field】 【0001】 The present invention relates to a medical filter device and a medical joint. 【Background Art】 【0002】 Patent Document 1 discloses a medical filter device in which a filter can be easily attached to and detached from a holder. In this device, a joint provided on the holder moves toward a joint provided on the filter, and the filter and the holder are connected by pressing them together with a spring in a state where a seal member is sandwiched between them. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2003-320025 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, in the above conventional medical filter device, for example, when the filter is not set at the correct position, or when the positions of the joints are displaced from the normal positions, the tip of the joint may come into contact with a part other than the seal member and be damaged. If the tip of the joint is damaged, even if the joints are connected again at the proper position, liquid leakage may occur due to the damage, and countermeasures are desired. 【0005】 Therefore, an object of the present invention is to provide a medical filter device and a medical joint capable of suppressing damage to the joint due to displacement. 【Means for Solving the Problems】 【0006】 A medical filter device according to one embodiment of the present invention comprises a filter having a first joint for connecting a flow path through which a liquid to be filtered flows, a holder having a second joint to which the flow path is connected, and a holding mechanism for holding the filter in a state in which the tips of the first joint and the second joint are abutted together when the filter is installed, wherein one of the first and second joints has a guide projection that protrudes toward the tip, and the other of the first and second joints has a guide groove that guides the guide projection. 【0007】 Furthermore, a medical joint according to one embodiment of the present invention is a medical joint for connecting fluid-flowing channels, comprising: a first joint portion provided at one end of the channel; a second joint portion provided at the other end of the channel; and a holding mechanism for holding the first joint portion and the second joint portion in a butted position, wherein one of the first and second joint portions has a guide projection protruding toward the tip, and the other of the first and second joint portions has a guide groove that guides the guide projection. [Effects of the Invention] 【0008】 According to the present invention, it is possible to provide a medical filter device and a medical joint that can suppress damage to the joint due to misalignment. [Brief explanation of the drawing] 【0009】 [Figure 1] This is a schematic diagram of a medical filter device according to one embodiment of the present invention. [Figure 2] This is a schematic diagram of a blood purification device using a medical filter device. [Figure 3] This figure shows the first joint and the second joint, where (a) is a perspective view, (b) is a cross-sectional view before connection, and (c) is a cross-sectional view after connection. [Figure 4] Figures (a) and (b) show a modified example of the first joint. [Figure 5] Figures (a) and (b) show a modified example of the first joint. [Figure 6]This figure shows a modified example of the first joint and the second joint. [Modes for carrying out the invention] 【0010】 [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 【0011】 (Outline configuration of medical filter device 1) Figure 1 is a schematic diagram of the medical filter device 1 according to this embodiment. The medical filter device 1 comprises a filter 2 having a first joint 11 for connecting a flow path through which the liquid to be filtered flows, and a holder 3 having a second joint 12 connected to the first joint 11. In this embodiment, the filter 2 is a dialysate filter. Therefore, in this embodiment, the liquid to be filtered is dialysate, and the flow path through which the liquid to be filtered flows is the dialysate flow path in a blood purification device (dialysissate supply path 104 and drainage path 106, which will be described later). The configuration of the blood purification device will be described later. 【0012】 The dialysis fluid filter, which is the filtration filter 2, has a cylindrical main body 21 and four first joints 11. First joints 11 (referred to as upper and lower first joints 11a) are provided at both ends of the main body 21 in the axial direction, and two first joints 11 (referred to as lateral first joints 11b) are provided side by side in the axial direction so as to protrude laterally (radially outward) from the main body 21. The specific structure of the first joints 11 will be described later. 【0013】 The holder 3 is configured to allow for easy attachment and detachment of the filtration filter 2. In this embodiment, the second joint portion 12 of the holder 3 is connected to the flow path of the dialysate, and the filtration filter 2 is connected to the flow path of the dialysate by attaching the filtration filter 2 to the holder 3 (i.e., by connecting the second joint portion 12 to the first joint portion 11). The holder 3 has upper and lower insertion ports 31 into which the upper and lower first joint portions 11a are inserted, and a lateral insertion port 32 into which the lateral first joint portion 11b is inserted. The filtration filter 2 is configured to be inserted into the lateral insertion port 32 by rotating it axially while the upper and lower first joint portions 11a are inserted into the upper and lower insertion ports 31. 【0014】 Inside the upper and lower inlet 31, there are second joint sections 12 (referred to as upper and lower second joint sections 12a) that are connected to the upper and lower first joint sections 11a. Inside the lateral inlet 32, there is a second joint section 12 (referred to as lateral second joint section 12b) to which the lateral first joint section 11b is connected. The specific structure of the second joint section 12 will be described later. When the upper and lower first joint sections 11a are inserted into the upper and lower inlet 31 and the lateral first joint section 11b is inserted into the lateral inlet 32 ​​(with the filter 2 installed), the corresponding upper and lower first joint sections 11a and upper and lower second joint sections 12a, and the lateral first joint section 11b and lateral second joint section 12b are configured to face each other. 【0015】 The holder 3 has a holding mechanism 33 that holds the first joint portion 11 and the second joint portion 12 in a butted position when the filtration filter 2 is attached. In this embodiment, the holding mechanism 33 is configured to extend the second joint portion 12 of the holder 3 toward the first joint portion 11 and hold it in the extended position when the lever 33a is operated. Here, the upper lever 33a is used to operate the upper upper and lower second joint portions 12a and the lateral second joint portion 12b, and the lower lever 33a is used to operate the lower upper and lower second joint portions 12a and the lateral second joint portion 12b. However, the specific configuration of the holding mechanism 33 is not particularly limited and can be changed as appropriate. 【0016】 (Blood purification device 10 using medical filter device 1) FIG. 2 is a schematic configuration diagram of a blood purification device using the medical filter device 1. As shown in FIG. 2, the blood purification device 10 includes a blood circuit 101 through which blood from a patient flows, a blood pump 102 provided in the blood circuit 101 for pumping the liquid in the blood circuit 101, and a blood purifier 100 provided in the blood circuit 101. Further, the blood purification device 10 includes a dialysate supply unit 103 for supplying dialysate, a dialysate supply line 104 connecting the dialysate supply unit 103 and the blood purifier 100, a first liquid feeding pump 105 provided in the dialysate supply line 104, a drainage discharge line 106 for discharging the drainage from the blood purifier 100, a second liquid feeding pump 107 provided in the drainage discharge line 106, a water removal flow path 106a provided in the drainage discharge line 106 so as to bypass the second liquid feeding pump 107, and a water removal pump 109 provided in the water removal flow path 106a. The discharge amounts of the first liquid feeding pump 105 and the second liquid feeding pump 107 are controlled to be the same, and by controlling the discharge amount of the water removal pump 109, water removal from the blood is controlled. 【0017】 In the present embodiment, the medical filter device 1 is provided in the dialysate supply line 104. The dialysate filter, which is the filtration filter 2, purifies the dialysate by capturing substances such as endotoxin contained in the dialysate. A bypass line 108 is connected to the medical filter device 1, and through this bypass line 108, dialysate or air with inappropriate concentration or temperature is discharged to the drainage discharge line 106. A valve 108a for opening and closing the bypass line 108 is provided in the bypass line 108, a valve 110a is provided in the dialysate supply line 104 between the dialysate filter 2a and the blood purifier 100, and a valve 110b is provided in the drainage discharge line 106 on the downstream side of the blood purifier 100. When feeding the dialysate to the blood purifier 100 side, the valves 110a and 110b are opened and the valve 108a is closed. When discharging dialysate with inappropriate concentration or temperature, the valves 110a and 110b are closed and the valve 108a is opened. Note that the configuration shown in FIG. 2 is merely an example, and the specific configuration of the blood purification device 10 can be changed as appropriate. 【0018】 (First joint part 11 and second joint part 12) FIG. 3 is a view showing the first joint part 11 and the second joint part 12. FIG. 3(a) is a perspective view, FIG. 3(b) is a cross-sectional view before connection, and FIG. 3(c) is a cross-sectional view after connection. As shown in FIGS. 3(a) to 3(c), the first joint part 11 has an insertion part 111 into which the tip part of the second joint part 12 is inserted, and a seal member (gasket) 112 provided at the bottom of the insertion part 111 and against which the tip part of the second joint part 12 abuts. That is, in the present embodiment, the first joint part 11 serves as the female joint, and the second joint part 12 serves as the male joint. Note that the male-female relationship may be reversed. However, it is preferably provided on the side of the filter 2, which is a consumable item (replaced approximately every three months), from a maintenance perspective. It can be said that it is more preferable that the first joint part 11 is the female side and the second joint part 12 is the male side. The seal member 112 is made of, for example, silicone rubber. 【0019】 In the medical filter device 1 according to the present embodiment, the second joint part 12 has a guide protrusion 13 protruding toward the tip side, and the first joint part 11 has a guide groove 14 for guiding the guide protrusion 13. Conversely, the first joint part 11 may have the guide protrusion 13 and the second joint part 12 may have the guide groove 14. That is, as long as one of the first and second joint parts 11, 12 has a guide protrusion 13 protruding toward the tip side, and the other of the first and second joint parts 11, 12 has a guide groove 14 for guiding the guide protrusion 13. 【0020】 In this embodiment, the guide groove 14 is formed in the insertion portion 111 and is provided to penetrate the insertion portion 111 radially. The second joint portion 12 has a cylindrical main body portion 121. The guide projection 13 protrudes radially outward from the outer circumferential surface of the main body portion 121 and is provided to protrude forward in the insertion direction beyond the tip of the main body portion 121. Because the second joint portion 12 has the guide projection 13, if there is a misalignment between the first joint portion 11 and the second joint portion 12, the guide projection 13 will collide with the first joint portion 11 before the main body portion 121 collides with the first joint portion 11, thereby preventing damage to the tip of the second joint portion 12. When the first joint portion 11 and the second joint portion 12 are in the correct position, the guide projection 13 will be inserted into the guide groove 14, and by sliding the guide projection 13 along the guide groove 14, the first joint portion 11 and the second joint portion 12 will be smoothly engaged. 【0021】 In this embodiment, the guide groove 14 is formed in a straight line to match the shape of the guide projection 13. However, it is not limited to this, and as shown in Figure 4(a), the guide groove 14 may be formed in a tapered shape such that its width increases towards the tip of the first joint portion 11. Also, although not shown, the guide projection 13 may be formed in a tapered shape such that its width decreases towards the tip. This makes it possible to guide the guide projection 13 to the guide groove 14 even if the relative positions of the first joint portion 11 and the second joint portion 12 are shifted by a small amount. 【0022】 Furthermore, as shown in Figure 4(b), a seal member retaining wall 113 may be provided so as to cover the outer circumferential surface of the seal member 112. If a part of the outer circumferential surface of the seal member 112 is exposed by the guide groove 14, there is a risk of sealing failure due to deformation of the seal member 112. By providing the seal member retaining wall 113, deformation and displacement of the seal member 112 can be suppressed, thereby suppressing sealing failure when connecting the first joint 11 and the second joint 12, and preventing liquid leakage caused by sealing failure. 【0023】 Furthermore, guide grooves 14 may be formed so as not to penetrate the insertion portion 111. More specifically, as shown in Figure 5(a), the guide grooves 14 may be formed on the inner circumferential surface of the insertion portion 111. Also, as shown in Figure 5(b), the guide grooves 14 may be formed on the inner circumferential surface of the insertion portion 111. This makes the insertion portion 111 a continuous cylindrical shape, thereby increasing the strength of the insertion portion 111. 【0024】 Furthermore, although this embodiment shows a case where two guide protrusions 13 are provided facing each other on either side of the central axis of the main body 121, the number of guide protrusions 13 is not limited to this, and one or more are sufficient. The guide protrusions 13 may be made of the same material as the main body 121, or they may be made of a different material (for example, a material harder than the main body 121). 【0025】 Furthermore, in this embodiment, the sealing member 112 is configured to be sandwiched between the first joint portion 11 and the second joint portion 12. However, as shown in Figure 6, the sealing member 112, which is made of an O-ring, may be provided on the inner circumferential surface of the insertion portion 111 of the first joint portion 11, thereby sealing the space between the inner circumferential surface of the insertion portion 111 and the outer circumferential surface of the main body portion 121 of the second joint portion 12. However, in this case, it is necessary to provide a groove for the sealing member 112, which would require a process for machining the groove or result in a complex mold shape and increased costs. Therefore, it is more desirable to configure the sealing member 112 to be sandwiched between the first joint portion 11 and the second joint portion 12, as in this embodiment. Note that the sealing member 112, which is made of an O-ring, may also be provided on the outer circumferential surface of the main body portion 121 of the second joint portion 12. 【0026】 Furthermore, although this embodiment describes a case where the filtration filter 2 is a dialysate filter, the embodiment is not limited to this, and the filtration filter 2 may be, for example, a blood purifier 100 (dialyzer). 【0027】 Furthermore, although this embodiment describes the case where the structure of the present invention is applied to all four first and second joint portions 11 and 12, it is sufficient if at least one of the first and second joint portions 11 and 12 has the structure of the present invention. In this case, it is more desirable to apply the structure of the present invention to the lateral first and second joint portions 11b and 12b, which are prone to misalignment due to axial dimensional errors of the filtration filter 2. 【0028】 (Medical fittings) Furthermore, the present invention is applicable not only to the medical filter device 1 described above, but also to medical joints that connect fluid-flowing channels. The medical joint may include a first joint portion 11 provided at the end of one channel, a second joint portion 12 provided at the end of the other channel, and a holding mechanism 33 that holds the tips of the first joint portion 11 and the second joint portion 12 in a butted position. Preferably, one of the first and second joint portions 11, 12 has a guide projection 13 that protrudes toward the tip, and the other of the first and second joint portions 11, 12 has a guide groove 14 that guides the guide projection 13. This prevents the tip of the second joint portion 12 from colliding with and damaging the first joint portion 11. The specific structure of the holding mechanism 33 is not particularly limited, and any structure that can hold the tips of the first joint portion 11 and the second joint portion 12 in a butted position is acceptable. The flow path through which the medical fittings are installed is not particularly limited as long as it is a flow path through which liquids pass; for example, it can be applied to blood circuits, infusion circuits, etc. 【0029】 (Operation and Effects of the Embodiment) As described above, the medical filter device 1 according to this embodiment comprises a filter 2 having a first joint portion 11 for connecting a flow path through which the liquid to be filtered flows, and a holder 3 having a second joint portion 12 to which the flow path is connected, and a holding mechanism 33 that holds the tip portions of the first joint portion 11 and the second joint portion 12 together when the filter 2 is attached, wherein one of the first and second joint portions 11, 12 has a guide projection 13 that protrudes toward the tip, and the other of the first and second joint portions 11, 12 has a guide groove 14 that guides the guide projection 13. 【0030】 By having the guide projection 13, even if the relative positions of the first joint 11 and the second joint 12 are shifted from their normal positions, for example, when the filtration filter 2 is not set in the correct position, it is possible to prevent the tip of the second joint 12 from colliding with the first joint 11, thereby suppressing damage to the joint (second joint 12) due to misalignment. As a result, it becomes possible to suppress liquid leakage caused by damage. 【0031】 (Summary of the embodiments) Next, the technical concept understood from the embodiments described above will be described using the reference numerals and other symbols from the embodiments. However, the reference numerals and other symbols in the following description are not limited to the components in the claims that are specifically shown in the embodiments. 【0032】 [1] A medical filter device (1) comprising: a filter (2) having a first joint (11) for connecting a flow path through which the liquid to be filtered flows; a holder (3) having a second joint (12) to which the flow path is connected; and a holding mechanism (33) for holding the filter (2) in a state in which the tips of the first joint (11) and the second joint (12) are abutted against each other when the filter (2) is installed, wherein one of the first and second joints (11, 12) has a guide projection (13) that protrudes toward the tip, and the other of the first and second joints (11, 12) has a guide groove (14) that guides the guide projection (13). 【0033】 [2] The medical filter device (1) according to [1], wherein the first joint portion (11) has an insertion portion (111) into which the tip of the second joint portion (12) is inserted, and a sealing member (112) provided at the bottom of the insertion portion (111) against which the tip of the second joint portion (12) abuts, the second joint portion (12) has a guide projection (13) that protrudes forward in the insertion direction from the tip, and the first joint portion (11) has the guide groove (13) in the insertion portion (111). 【0034】 [3] The medical filter device (1) according to [2], wherein the guide groove (14) is provided to penetrate the insertion portion (111) in the radial direction. 【0035】 [4] The guide groove (14) is tapered so that it becomes wider towards the tip of the first joint (11), as described in [2], medical filter device (1). 【0036】 [5] The medical filter device (1) according to [2], wherein the guide groove (14) is formed on the inner circumferential surface of the insertion portion (111) and does not penetrate the insertion portion (111) in the radial direction. 【0037】 [6] The medical filter device (1) according to [2], wherein the guide groove (14) is formed on the outer circumferential surface of the insertion portion (111) and does not penetrate the insertion portion (111) in the radial direction. 【0038】 [7] The medical filter device (1) according to [1], wherein the liquid to be filtered is a dialysate and the filter (2) is a dialysate filter. 【0039】 [8] A medical joint for connecting two fluid-carrying channels, comprising: a first joint portion (11) provided at one end of the channel; a second joint portion (12) provided at the other end of the channel; and a holding mechanism (33) for holding the tips of the first joint portion (11) and the second joint portion (12) in a butted position, wherein one of the first and second joint portions (11, 12) has a guide projection (13) protruding toward the tip, and the other of the first and second joint portions (11, 12) has a guide groove (14) that guides the guide projection (13). 【0040】 Although embodiments of the present invention have been described above, the embodiments described above do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention. In addition, the present invention can be implemented with appropriate modifications without departing from its spirit. [Explanation of Symbols] 【0041】 1…Medical filter device 2… Filtration filter 3…Holder 33...Retention mechanism 11…First joint section 111... Inserted part 112...Sealing material 12...Second joint section 13… Guide projection 14… Guide groove

Claims

[Claim 1] A filtration filter having a first joint for connecting a flow path through which the liquid to be filtered flows, The holder comprises a second joint portion to which the flow path is connected, and a holding mechanism that holds the first joint portion and the second joint portion in a state where their tips are abutted together when the filter is attached. The first joint portion has an insertion portion into which the tip of the second joint portion is inserted, and a sealing member provided at the bottom of the insertion portion against which the tip of the second joint portion abuts. The second joint portion has a guide projection that protrudes forward in the insertion direction from its tip portion, The first joint portion has a guide groove that guides the guide projection in the portion to be inserted. Medical filter device. [Claim 2] The guide groove is formed in the insertion portion so as to be aligned with its axial direction, The guide projection is slid along the guide groove, and the tip of the second joint is inserted into the insertion portion of the first joint, thereby fitting the first joint and the second joint together. A medical filter device according to claim 1. [Claim 3] The guide groove is provided so as to penetrate the insertion portion radially. A medical filter device according to claim 1. [Claim 4] The guide groove is tapered so that its width increases towards the tip of the first joint. A medical filter device according to claim 1. [Claim 5] The guide groove is formed on the inner circumferential surface of the portion to be inserted and does not penetrate the portion to be inserted in the radial direction. A medical filter device according to claim 1. [Claim 6] The guide groove is formed on the outer circumferential surface of the portion to be inserted and does not penetrate the portion to be inserted in the radial direction. A medical filter device according to claim 1. [Claim 7] The liquid to be filtered is a dialysate. The aforementioned filtration filter is a dialysate filter. A medical filter device according to claim 1.

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