Mixing stopcock

Abstract

A mixing stopcock (100) comprises: a columnar switching cock (130); and a body cock (110) including a storage chamber that stores the switching cock (130) so as to be rotatable about the rotation axis (Z) of the switching cock (130). The body cock (110) includes a first body pipeline (112), a second body pipeline (114), and a third body pipeline (118) that each penetrate in a direction intersecting the rotation axis (Z) of the switching cock (130). When viewed in a cross-section along a virtual plane including the rotation axis (Z), at least one of a first switching pipeline (130a) and a second switching pipeline (130b) is set to extend in a direction obliquely intersecting the rotation axis (Z), and is in communication with a swirling flow generation chamber (130d).

Description

Mixing stopcock

[0001] The present invention relates to a mixing stopcock.

[0002] For example, Japanese Patent No. 6281050 (Patent Document 1) discloses an invention relating to a mixing device, a mixing tube, an infusion injection system, and a method for mixing infusion liquids.

[0003] The mixing device disclosed in Patent Document 1 comprises a swirling flow generating chamber for generating a swirling flow, a first inlet for introducing a first infusion into the swirling flow generating chamber in a direction parallel to the central axis of the swirling flow, a second inlet for introducing a second infusion into the swirling flow generating chamber so that a swirling flow of the second infusion having a specific gravity lower than that of the first infusion is generated in the swirling flow generating chamber, an outlet from which a mixed infusion of the first infusion and the second infusion flows out, and a narrowing chamber provided between the swirling flow generating chamber and the outlet, having a space that continuously narrows toward the outlet.

[0004] Patent No. 6281050

[0005] According to the mixing device of the above configuration, the first infusion liquid and the second infusion liquid having a specific gravity lower than that of the first infusion liquid can be efficiently mixed by the swirling flow in the swirling flow generating chamber.

[0006] However, since the mixing device does not have a mechanism for switching the flow path, it cannot be used as a stopcock for switching the flow path.

[0007] The object of the present technology is to provide a mixing stopcock that enables efficient mixing when mixing and discharging a first infusion and a second infusion, and that is equipped with a mechanism that can switch flow paths.

[0008] [1] In one aspect of a mixing stopcock according to the present technology, there is provided a mixing stopcock including a cylindrical selector cock and a main cock including a housing chamber that houses the selector cock rotatably around a rotation axis of the selector cock, wherein the main cock includes a first main body conduit, a second main body conduit, and a third main body conduit that respectively penetrate in a direction intersecting the rotation axis of the selector cock. The selector cock includes a swirling flow generating chamber that generates a swirling flow, and a first switching conduit, a second switching conduit, and a third switching conduit that respectively communicate with the swirling flow generating chamber.

[0009] When the switching cock is in a first state, the first main body conduit and the first switching conduit are communicated with each other, the second main body conduit and the second switching conduit are communicated with each other, and the third main body conduit and the third switching conduit are communicated with each other. In a second state in which the switching cock is rotated a predetermined angle around the rotation axis, the first main body conduit is closed by the switching cock, the second main body conduit and the third switching conduit are communicated with each other, the third main body conduit and the first switching conduit are communicated with each other, and the second switching conduit is closed by the main body cock. When the switching cock is in the first state, In a third state, which is different from the second state and rotated a predetermined angle around the rotation axis, the first main body line and the third switching line are connected, the second main body line is blocked by the switching cock, the third main body line and the second switching line are connected, and the first switching line is blocked by the main body cock, and when viewed in a cross section along an imaginary plane including the rotation axis, at least one of the first switching line and the second switching line extends in a direction obliquely intersecting the rotation axis and is connected to the swirling flow generating chamber.

[0010] [2]: In the mixing stopcock described in [1], when viewed in a cross section along an imaginary plane perpendicular to the rotation axis, at least one of the first switching pipe line and the second switching pipe line extends in an oblique direction away from the rotation axis and is connected to the swirling flow generating chamber.

[0011] [3]: In another aspect of the mixing stopcock according to the present technology, there is provided a mixing stopcock including a cylindrical selector cock and a main cock including a housing chamber that houses the selector cock rotatably around a rotation axis of the selector cock, wherein the main cock includes a first main body conduit, a second main body conduit, and a third main body conduit that respectively penetrate in a direction intersecting the rotation axis of the selector cock. The selector cock includes a swirling flow generating chamber that generates a swirling flow, and a first switching conduit, a second switching conduit, and a third switching conduit that respectively communicate with the swirling flow generating chamber.

[0012] When the switching cock is in a first state, the first main body pipe and the first switching pipe are communicated with each other, the second main body pipe and the second switching pipe are communicated with each other, and the third main body pipe and the third switching pipe are communicated with each other, and in a second state in which the switching cock is rotated around the rotation axis by a predetermined angle, the first main body pipe is closed by the switching cock, the second main body pipe and the third switching pipe are communicated with each other, the third main body pipe and the first switching pipe are communicated with each other, and the second switching pipe is closed by the main body cock. Unlike the first state and the second state, in a third state rotated by a predetermined angle around the rotation axis, the first main body line and the third switching line are connected, the second main body line is closed by the switching cock, the third main body line and the second switching line are connected, and the first switching line is closed by the main body cock, and when viewed in a cross section along an imaginary plane perpendicular to the rotation axis, at least one of the first switching line and the second switching line extends in an oblique direction away from the rotation axis and is connected to the swirl flow generating chamber.

[0013] [4]: In the mixing stopcock described in [3], when viewed in a cross section along an imaginary plane including the rotation axis, at least one of the first switching pipe line and the second switching pipe line extends in a direction that intersects obliquely with the rotation axis and is connected to the swirling flow generating chamber.

[0014] According to the present technology, it is possible to provide a mixing stopcock that enables efficient mixing when mixing and discharging the first infusion liquid and the second infusion liquid, and that is equipped with a mechanism that can switch the flow path.

[0015] 1 is a diagram showing a circuit of a kit for introducing an infusion into a patient. FIG. 1 is an overall perspective view of a mixing stopcock of embodiment 1. FIG. 2 is a first partial perspective sectional view of the mixing stopcock of embodiment 1. FIG. 3 is a second partial perspective sectional view of the mixing stopcock of embodiment 1. FIG. 4 is a second partial front sectional view of the mixing stopcock of embodiment 1. FIG. 5 is a plan view showing a first state of the mixing stopcock of embodiment 1. FIG. 6 is a partial plan sectional view showing the first state of the mixing stopcock of embodiment 1. FIG. 7 is a plan view showing a second state of the mixing stopcock of embodiment 1. FIG. 8 is a partial plan sectional view showing the second state of the mixing stopcock of embodiment 1. FIG. 9 is a plan view showing a third state of the mixing stopcock of embodiment 1. FIG. 10 is a partial plan sectional view showing the third state of the mixing stopcock of embodiment 1. FIG. 11 is a partial front sectional view showing the first state of the mixing stopcock of embodiment 1. FIG. 12 is a partial plan sectional view showing the first state of the mixing stopcock of embodiment 1. FIG. 13 is a schematic view showing the stirring state of the infusion in the swirl flow generating chamber of the mixing stopcock of embodiment 1. FIG. 14 is a partial front sectional view of the mixing stopcock of embodiment 2. Fig. 1 is a partial cross-sectional plan view of a mixing stopcock of embodiment 2. Fig. 2 is a partial cross-sectional front view of a mixing stopcock of embodiment 3. Fig. 3 is a partial cross-sectional plan view of a mixing stopcock of embodiment 3. Fig. 4 is a partial cross-sectional front view of a mixing stopcock of embodiment 4. Fig. 5 is a partial cross-sectional plan view of a mixing stopcock of embodiment 4.

[0016] Hereinafter, embodiments of the present technology will be described. The same or corresponding parts will be denoted by the same reference characters, and description thereof will not be repeated in some cases.

[0017] In each embodiment described below, when referring to numbers, amounts, etc., unless otherwise specified, the scope of the present technology is not necessarily limited to those numbers, amounts, etc. Furthermore, in the following embodiments, each component is not necessarily essential to the present technology unless otherwise specified.

[0018] In this specification, the terms "comprise," "include," and "have" are open-ended. That is, when a certain configuration is included, other configurations may or may not be included. Furthermore, the present technology is not necessarily limited to those that achieve all of the effects mentioned in the present embodiment.

[0019] (Embodiment 1: Infusion circuit 1000) An overview of an infusion circuit 1000 will be described with reference to Fig. 1. Fig. 1 is a diagram showing the circuit of a kit for introducing infusion fluid into a patient.

[0020] The circuit of this kit is connected to a first syringe 10 and a second syringe 20 attached to an injector head (not shown). The first syringe 10 is filled with a contrast medium as a first infusion liquid. The second syringe 20 is filled with saline as a second infusion liquid. The specific gravity of saline differs from that of the contrast medium, with the contrast medium having a higher specific gravity.

[0021] A first syringe 10 is connected to one end of a first infusion line L1, and a first three-way stopcock 100 is connected to the other end. One ends of a third infusion line L3 and a fifth infusion line L5 are connected to the first three-way stopcock 100, and the flow paths are controlled by the first three-way stopcock 100. The switching control of the first three-way stopcock 100 is electrically switched by a control device (not shown). A first drip chamber 30 for connection to a contrast medium bottle or the like is attached to the other end of the third infusion line L3.

[0022] A second syringe 20 is connected to one end of the second infusion line L2, and a second three-way stopcock 200 is connected to the other end. One ends of the fourth infusion line L4 and the sixth infusion line L6 are connected to the second three-way stopcock 200, and the flow paths are controlled by the second three-way stopcock 200. The switching control of the second three-way stopcock 200 is electrically controlled by a control device (not shown) along with the control of the injector head. A second drip chamber 40 for connection to a saline pack or the like is attached to the other end of the third infusion line L3.

[0023] The other end of the fifth infusion line L5 and the other end of the sixth infusion line L6 are connected to the mixing stopcock 100A in this embodiment. The other end of the sixth infusion line L6 is connected to the first main body line 112 of the mixing stopcock 100A, which will be described later, and the other end of the fifth infusion line L5 is connected to the second main body line 114. One end of the seventh infusion line L7 is connected to the third main body line 118 of the mixing stopcock 100A.

[0024] The other end of the seventh infusion line L7 is connected to a third three-way stopcock 300. The third three-way stopcock 300 is connected to an eighth infusion line L8 connected to the patient and a ninth infusion line L9 connected to a blood pressure measuring device (not shown). The switching control of the third three-way stopcock 300 is electrically controlled by a control device (not shown) along with the control of the injector head. The seventh infusion line L7 is provided with a tube clamp CC for opening or closing the conduit of the seventh infusion line L7, and is controlled by the control device.

[0025] (Configuration of mixing stopcock 100A) The configuration of the mixing stopcock 100A will be described with reference to Figures 2 to 5. Figure 2 is an overall perspective view of the mixing stopcock 100A, Figure 3 is a first partial perspective cross-sectional view of the mixing stopcock 100A, and Figure 4 is a second partial perspective cross-sectional view of the mixing stopcock 100A.

[0026] The mixing stopcock 100A includes a cylindrical switching cock 130 and a main cock 110 including a housing chamber 110r with a cylindrical inner wall that houses the switching cock 130 rotatably around a rotation axis Z of the switching cock 130. The switching cock 130 is provided with a switching handle 131 for rotating the switching cock 130 around the rotation axis Z.

[0027] The main body cock 110 includes a first main body pipe 112, a second main body pipe 114, and a third main body pipe 118, each of which penetrates in a direction intersecting the rotation axis Z of the switching cock 130.

[0028] The first main body conduit 112 has a first inlet passage 112a, a first relay passage 112b that communicates with the first inlet passage 112a and narrows toward the storage chamber 110r, and a first outlet passage 112c that communicates with the first relay passage 112b and leads to the storage chamber 110r.

[0029] The second main body conduit 114 has a second inlet passage 114a, a second relay passage 114b that communicates with the second inlet passage 114a and narrows toward the storage chamber 110r, and a second outlet passage 114c that communicates with the second relay passage 114b and leads to the storage chamber 110r.

[0030] The third main body conduit 118 has a third inlet passage 118a (see Figure 7), a third relay passage 118b that communicates with the third inlet passage 118a and narrows toward the storage chamber 110r, and a third outlet passage 118c that communicates with the third relay passage 118b and leads to the storage chamber 110r.

[0031] The third main body conduit 118 is provided with a swivel nut 120 and a connecting conduit 122 for connecting one end of the seventh infusion line L7.

[0032] The switching cock 130 includes a swirl flow generating chamber 130d that generates a swirl flow, and a first switching pipe 130a, a second switching pipe 130b, and a third switching pipe 130c that are respectively connected to the swirl flow generating chamber 130d.

[0033] In the swirl flow generating chamber 130d, the axis X1 along which the first switching conduit 130a extends, the axis X2 along which the second switching conduit 130b extends, the axis Y along which the third switching conduit 130c extends, and the rotation axis Z are preferably arranged to intersect at an intersection P1 within the swirl flow generating chamber 130d. In this embodiment, the axis X1 and the axis X2 are coaxial, and the axis X1, the axis X2, and the axis Y are orthogonal to each other and are included in the same imaginary plane H1 (see FIG. 3). Furthermore, the axis X1, the axis X2, and the rotation axis Z are orthogonal to each other and are included in the same imaginary plane H2 (see FIG. 4), but this is not limiting. Note that, although not shown in the following drawings, the imaginary planes H1 and H2 refer to the imaginary planes shown in FIGS. 3 and 4.

[0034] 4 and 5, when viewed in a cross section taken along an imaginary plane H2 including the rotation axis Z, the first switching pipe 130a and the second switching pipe 130b extend in a direction obliquely intersecting the rotation axis Z and communicate with the swirl flow generating chamber 130d.

[0035] Specifically, the first switching pipe 130a is inclined from the upper right to the lower left in the drawing as indicated by the arrow FX1 in the drawing, and is connected to the swirl flow generating chamber 130d. The second switching pipe 130b is inclined from the lower left to the upper right in the drawing as indicated by the arrow FX2 in the drawing, and is connected to the swirl flow generating chamber 130d.

[0036] (Switching states) Next, the switching states of the mixing stopcock 100A will be described with reference to Figures 6 to 11. Figure 6 is a plan view showing the first state of the mixing stopcock 100A, Figure 7 is a partial cross-sectional plan view showing the first state of the mixing stopcock 100A, Figure 8 is a plan view showing the second state of the mixing stopcock 100A, Figure 9 is a partial cross-sectional plan view showing the second state of the mixing stopcock 100A, Figure 10 is a plan view showing the third state of the mixing stopcock 100A, and Figure 11 is a partial cross-sectional plan view showing the third state of the mixing stopcock 100A.

[0037] 6 and 7, when the mixing stopcock 100A is in the first state, the switching cock 130 is positioned so that the first main body conduit 112 and the first switching conduit 130a are connected, the second main body conduit 114 and the second switching conduit 130b are connected, and the third main body conduit 118 and the third switching conduit 130c are connected. In this first state, as shown in Fig. 7, the first infusion solution introduced from the first main body conduit 112 (flow indicated by arrow FX1) and the second infusion solution introduced from the second main body conduit 114 (flow indicated by arrow FX2) are mixed in the swirl flow generating chamber 130d and sent out from the third main body conduit 118 as a mixed infusion solution (flow indicated by arrow FY1).

[0038] 8 and 9, in a second state in which the selector cock 130 is rotated 90 degrees clockwise (in the direction of arrow R1 in the figures) around the rotation axis Z using the selector handle 131 from the state shown in Fig. 6, the first main body conduit 112 is closed by the selector cock 130, the second main body conduit 114 and the third switching conduit 130c are connected, the third main body conduit 118 and the first switching conduit 130a are connected, and the second switching conduit 130b is closed by the main body cock 110. In this second state, as shown in Fig. 9, the second infusion solution introduced from the second main body conduit 114 (flow indicated by arrow FX1) is sent out from the third main body conduit 118.

[0039] 10 and 11, in a third state in which the selector cock 130 is rotated 90 degrees clockwise (in the direction of arrow R2 in the figures) around the rotation axis Z using the selector handle 131 from the state shown in Fig. 6, the first main body conduit 112 and the third switching conduit 130c are connected, the second main body conduit 114 is closed by the selector cock 130, the third main body conduit 118 and the second switching conduit 130b are connected, and the first switching conduit 130a is closed by the main body cock 110. In this third state, as shown in Fig. 11, the first infusion solution introduced from the first main body conduit 112 (flow indicated by arrow FX1) is sent out from the third main body conduit 118.

[0040] Here, the flow of the first infusion fluid and the second infusion fluid in the first state will be described with reference to Figures 12 to 14. Figure 12 is a partial front cross-sectional view showing the mixing stopcock 100A in the first state, Figure 13 is a partial top cross-sectional view showing the mixing stopcock 100A in the first state, and Figure 14 is a schematic diagram showing the stirring state of the infusion fluid in the swirl flow generating chamber 130d of the mixing stopcock 100A.

[0041] As shown in Fig. 12, in the mixing stopcock 100A of this embodiment, the first switching conduit 130a is inclined from the upper right to the lower left in the figure, as indicated by arrow FX1 in the figure, and communicates with the swirl flow generating chamber 130d. The second switching conduit 130b is inclined from the lower left to the upper right in the figure, as indicated by arrow FX2 in the figure, and communicates with the swirl flow generating chamber 130d. Note that, as shown in Fig. 13, when viewed in a cross section along an imaginary plane perpendicular to the rotation axis Z, both the first switching conduit 130a and the second switching conduit 130b extend perpendicular to the rotation axis Z.

[0042] 14, the first infusion flow (flow indicated by arrow FX1) and the second infusion flow (flow indicated by arrow FX1) flowing into the swirl flow generating chamber 130d from the first switching conduit 130a and the second switching conduit 130b configured as described above form a swirling flow without colliding in the swirl flow generating chamber 130d. As a result, even if the specific gravities of the first and second infusions are significantly different, the vortex formed in the swirl flow generating chamber 130d allows the first and second infusions to be sufficiently stirred and mixed before being sent from the third switching conduit 130c to the third main conduit 118. Furthermore, the flow paths through which the first and second infusions flow can be switched between the second and third states as needed.

[0043] (Embodiment 2: Mixing stopcock 100B) The configuration of the mixing stopcock 100B in embodiment 2 will be described with reference to Figures 15 and 16. Figure 15 is a partial front cross-sectional view of the mixing stopcock 100B, and Figure 16 is a partial plan cross-sectional view of the mixing stopcock 100B. The basic configuration of this mixing stopcock 100B is the same as that of the mixing stopcock 100A in embodiment 1 above.

[0044] In this mixing stopcock 100B, the second switching line 130b is the same as the configuration of the mixing stopcock 100A, but the first switching line 130a is arranged to extend in a perpendicular direction both when viewed in a cross section along an imaginary plane including the rotation axis Z and when viewed in a cross section along an imaginary plane perpendicular to the rotation axis Z.

[0045] In this way, even if only the second switching conduit 130b is provided so as to extend in a direction that intersects obliquely with the rotation axis Z when viewed in a cross section along an imaginary plane including the rotation axis Z, the vortex formed in the swirl flow generating chamber 130d can promote mixing of the first infusion liquid and the second infusion liquid, and it is expected to achieve the same effect as in Embodiment 1. The same applies even if the configurations of the first switching conduit 130a and the second switching conduit 130b are interchanged.

[0046] (Embodiment 3: Mixing stopcock 100C) The configuration of the mixing stopcock 100C in embodiment 3 will be described with reference to Figures 17 and 18. Figure 17 is a partial front cross-sectional view of the mixing stopcock 100C, and Figure 18 is a partial plan cross-sectional view of the mixing stopcock 100C. The basic configuration of this mixing stopcock 100C is the same as that of the mixing stopcock 100A in embodiment 1 above.

[0047] In this mixing stopcock 100C, as shown in Figure 17, compared to the configuration of the mixing stopcock 100A, the first switching line 130a and the second switching line 130b are arranged to extend in directions perpendicular to each other when viewed in a cross section along an imaginary plane including the rotation axis Z.

[0048] On the other hand, as shown in Figure 18, when viewed in a cross section along an imaginary plane perpendicular to the rotation axis Z, both the first switching pipe line 130a and the second switching pipe line 130b are arranged to extend in an oblique direction away from the rotation axis Z.

[0049] Specifically, the first switching pipe 130a is inclined from the upper right to the lower left in the drawing as indicated by the arrow FX1 in the drawing, and is connected to the swirl flow generating chamber 130d. The second switching pipe 130b is inclined from the lower left to the upper right in the drawing as indicated by the arrow FX2 in the drawing, and is connected to the swirl flow generating chamber 130d.

[0050] In this configuration of the mixing stopcock 100C, the formation of a vortex in the swirl flow generating chamber 130d can promote mixing of the first infusion liquid and the second infusion liquid, and it is expected to achieve the same effects as in embodiment 1. The same applies even if the inclination directions of the first switching conduit 130a and the second switching conduit 130b are reversed.

[0051] (Embodiment 4: Mixing stopcock 100D) The configuration of mixing stopcock 100D in embodiment 4 will be described with reference to Figures 19 and 20. Figure 19 is a partial front cross-sectional view of mixing stopcock 100D, and Figure 20 is a partial plan cross-sectional view of mixing stopcock 100D. The basic configuration of this mixing stopcock 100D is the same as that of mixing stopcock 100A in embodiment 1 above.

[0052] As shown in Figure 19, when viewed in a cross section along an imaginary plane including the rotation axis Z, the shapes of the first switching line 130a and the second switching line 130b are the same as those of the mixing stopcock 100A. However, as shown in Figure 20, when viewed in a cross section along an imaginary plane perpendicular to the rotation axis Z, both the first switching line 130a and the second switching line 130b are arranged to extend in an oblique direction away from the rotation axis Z.

[0053] Specifically, the first switching pipe 130a is inclined from the lower right to the upper left in the drawing as indicated by the arrow FX1 in the drawing, and is connected to the swirl flow generating chamber 130d. The second switching pipe 130b is inclined from the lower left to the upper right in the drawing as indicated by the arrow FX2 in the drawing, and is connected to the swirl flow generating chamber 130d.

[0054] In this configuration of the mixing stopcock 100D, the formation of a vortex in the swirl flow generating chamber 130d can also promote mixing of the first infusion liquid and the second infusion liquid, and it is expected to achieve the same effect as in embodiment 1. The same applies even if the inclination direction of the first switching conduit 130a and the second switching conduit 130b is inclined toward the third main body conduit 118 in the figure.

[0055] Although the embodiments of the present technology have been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present technology is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims.

[0056] 100A, 100B, 100C, 100D Mixing stopcock, 10 First syringe, 20 Second syringe, 30 First drip chamber, 40 Second drip chamber, 100 First three-way stopcock, 110 Main body cock, 110r Storage chamber, 112 First main body conduit, 112a First inlet channel, 112b First relay channel, 112c First outlet channel, 114 Second main body conduit, 114a Second inlet channel, 114b Second relay channel, 114c Second outlet channel, 118 Third main body conduit, 118a Third inlet channel, 118b Third relay channel, 118c Third outlet channel, 120 Swivel nut, 122 Connecting conduit, 130 Switching cock, 130a First switching conduit, 130b Second switching conduit, 130c Third switching pipeline, 130d swirl flow generating chamber, 131 switching handle, 200 second three-way stopcock, 300 third three-way stopcock, 1000 infusion injection circuit, H1, H2 imaginary plane, L1 first infusion line, L2 second infusion line, L3 third infusion line, L4 fourth infusion line, L5 fifth infusion line, L6 sixth infusion line, L7 seventh infusion line, L8 eighth infusion line, L9 ninth infusion line.

Claims

1. A mixing stopcock comprising: a cylindrical switching cock; and a main cock including a storage chamber that stores the switching cock rotatably around a rotation axis of the switching cock, wherein the main cock includes a first main body conduit, a second main body conduit, and a third main body conduit that each penetrate in a direction intersecting the rotation axis of the switching cock, the switching cock includes a swirling flow generating chamber that generates a swirling flow, and a first switching conduit, a second switching conduit, and a third switching conduit that each communicate with the swirling flow generating chamber, wherein when the switching cock is in a first state, the first main body conduit and the first switching conduit are connected, the second main body conduit and the second switching conduit are connected, and the third main body conduit and the third switching conduit are connected, and in a second state in which the switching cock has rotated a predetermined angle around the rotation axis, the first main body conduit is blocked by the switching cock, a mixing stopcock in which the second main body conduit and the third switching conduit are connected, the third main body conduit and the first switching conduit are connected, and the second switching conduit is blocked by the main body cock; in a third state in which the switching cock is rotated a predetermined angle around the rotation axis different from the first and second states, the first main body conduit and the third switching conduit are connected, the second main body conduit is blocked by the switching cock, the third main body conduit and the second switching conduit are connected, and the first switching conduit is blocked by the main body cock; and when viewed in a cross section along an imaginary plane including the rotation axis, at least one of the first switching conduit and the second switching conduit extends in a direction obliquely intersecting the rotation axis and is connected to the swirl flow generating chamber.

2. A mixing stopcock as described in claim 1, wherein, when viewed in a cross section along an imaginary plane perpendicular to the rotation axis, at least one of the first switching pipe and the second switching pipe extends in an oblique direction away from the rotation axis and communicates with the swirling flow generating chamber.

3. A mixing stopcock comprising: a cylindrical switching cock; and a main cock including a storage chamber that stores the switching cock rotatably around a rotation axis of the switching cock, wherein the main cock includes a first main body pipe, a second main body pipe, and a third main body pipe, each of which penetrates in a direction intersecting the rotation axis of the switching cock, the switching cock includes a swirling flow generating chamber that generates a swirling flow, and a first switching pipe, a second switching pipe, and a third switching pipe, each of which communicates with the swirling flow generating chamber, wherein when the switching cock is in a first state, the first main body pipe and the first switching pipe are connected, the second main body pipe and the second switching pipe are connected, and the third main body pipe and the third switching pipe are connected, and in a second state in which the switching cock has rotated a predetermined angle around the rotation axis, the first main body pipe is blocked by the switching cock, a mixing stopcock in which the second main body conduit and the third switching conduit are connected, the third main body conduit and the first switching conduit are connected, and the second switching conduit is blocked by the main body cock; in a third state in which the switching cock is rotated a predetermined angle around the rotation axis different from the first and second states, the first main body conduit and the third switching conduit are connected, the second main body conduit is blocked by the switching cock, the third main body conduit and the second switching conduit are connected, and the first switching conduit is blocked by the main body cock; and when viewed in a cross section along an imaginary plane perpendicular to the rotation axis, at least one of the first switching conduit and the second switching conduit extends in an oblique direction away from the rotation axis and is connected to the swirling flow generating chamber.

4. A mixing stopcock as described in claim 3, wherein, when viewed in a cross section along an imaginary plane including the rotation axis, at least one of the first switching pipe and the second switching pipe extends in a direction obliquely intersecting the rotation axis and communicates with the swirling flow generating chamber.

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