JP7643008B2 - Filter Device - Google Patents

Description

The present invention relates to a filter device for an extracorporeal circulation circuit.

Conventionally, in cardiac surgery, etc., an extracorporeal circulation circuit, which is a blood circulation circuit equipped with an artificial lung, is used to substitute for the extracorporeal circulation function of a patient during surgery. When using the extracorporeal circulation circuit, priming is performed in advance by circulating a priming solution such as physiological saline in the extracorporeal circulation circuit in order to prevent foreign matter or air from being mixed into the blood during operation (see Patent Document 1).
A cleaning filter device is disposed in the extracorporeal circuit to capture foreign matter during priming. The cleaning filter device includes a filter material and a container for storing the filter material. The container is divided into two parts for containing the filter material, and the two parts are connected together after the filter material is placed in the container. An O-ring is disposed at the connecting part to improve airtightness.

JP 2008-246141 A

However, even after priming, air bubbles may remain near the O-ring inside the filter device.

The present invention aims to provide a filter device for an extracorporeal circuit that is less likely to leave air bubbles after priming.

In order to solve the above problems, the present invention provides a filter device used during priming of an extracorporeal circulation circuit, comprising: a first container having a first tubular portion, a first end surface portion covering one end of the first tubular portion, and a first fluid inlet/outlet extending from the first end surface portion in the axial direction of the first tubular portion; a second container having a second tubular portion having one end connected to the other end of the first container, a second end surface portion covering the other end of the second tubular portion, and a second fluid inlet/outlet extending from the second end surface portion in the axial direction of the second tubular portion, and a protrusion portion having a slit provided along the circumference and discontinuously on the outer periphery of the inner surface of the second end surface portion; an O-ring that spans the outer periphery of the protrusion portion and is held between the end surface of the first tubular portion and the inner surface of the second end surface portion; and a filter material that is stored in an internal space formed by connecting the first container and the second container to each other.

It is also preferable that the slits are evenly spaced in the circumferential direction.

It is also preferable that the first cylindrical portion is disposed on the fluid inlet side and the second cylindrical portion is disposed on the fluid outlet side.

The blood circulation circuit may also include an artificial lung.

The present invention provides a filter device for a blood circulation circuit that is less likely to leave air bubbles after priming.

FIG. 2 is a diagram illustrating the configuration of a blood circulation circuit 100. 1 is a cross-sectional view including a cleaning filter device 1 and a part of a tube 101 connected to the cleaning filter device 1. FIG. 3A to 3C are diagrams illustrating a method for manufacturing the filter material 10. FIG. 2 is an exploded perspective view of the cleaning filter device 1. FIG. 3 is a partially enlarged view of FIG. 2 . FIG. 11 is a perspective view of the second container 20B as seen from the inner surface side. 13 is a diagram showing a state in which the operating member 43 is disassembled from the first detachable portion 40A. FIG. 13A to 13C are diagrams illustrating a procedure for attaching the second detachable part 50A of the second detachable member 80 to the first detachable part 40A of the cleaning filter device 1. 1A to 1C are diagrams illustrating a removal procedure of the cleaning filter device 1. 11A to 11C are diagrams illustrating a procedure for removing the second detachable part 50A from the first detachable part 40A.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the embodiment, a washing filter device 1 through which a priming liquid flows will be described as an example of the fluid treatment device, and a blood circulation circuit 100 will be described as an example of the extracorporeal circulation circuit.
However, the fluid flowing through the fluid treatment device is not limited to the priming liquid, and may be blood, other drugs, etc. The fluid treatment device may be an artificial lung, a blood filter, a heat exchanger, a hemoconcentrator, a blood reservoir, a blood pump, etc. The extracorporeal circulation circuit may be a myocardial protection circuit, etc.

(Blood circulation circuit 100)
1 is a diagram illustrating the configuration of a blood circulation circuit 100. The blood circulation circuit 100 is used in an artificial heart-lung system and includes a blood reservoir 3, a blood pump 4, an artificial lung 5, a blood filter device 6, and a cleaning filter device 1 for cleaning the circuit. Each device is connected by a tube 101 made of flexible polyvinyl chloride or the like.

In the following description, the case where the blood circulation circuit 100 is used as an artificial heart-lung system that collects blood from a patient and pumps the blood is referred to as "normal use." In addition, the operation of circulating a priming liquid (e.g., saline) through the blood circulation circuit 100 before "normal use" to remove foreign objects and air bubbles present in the blood circulation circuit 100 is referred to as "priming."

(Blood storage tank 3)
The blood reservoir 3 stores blood taken from a patient during normal use, and stores a priming solution during priming.

(Blood Pump 4)
The blood pump 4 is disposed downstream of the blood reservoir 3 and circulates the blood or the priming solution. A well-known centrifugal pump or a roller pump is used as the blood pump 4. In this embodiment, a centrifugal pump is used, and a rotor provided therein is driven to apply pressure to the blood or the priming solution, thereby circulating the blood or the priming solution within the blood circulation circuit 100.

(Artificial Lung 5)
The artificial lung 5 is disposed downstream of the blood pump 4. During normal use, the artificial lung 5 adjusts the temperature of blood pumped from the blood reservoir 3 to the patient by the blood pump 4, and performs gas exchange (addition of oxygen, removal of carbon dioxide, etc.) of the blood. Oxygen is supplied, for example, by an oxygen cylinder, and supplies oxygen to be added to the blood.

(Blood filter device 6)
During normal use, the blood filter device 6 filters blood and removes air bubbles from the blood.

(Cleaning filter device 1)
The cleaning filter device 1 is used during priming of the blood circulation circuit 100 and is removed after priming. Fig. 2 is a cross-sectional view including the cleaning filter device 1 and a part of a tube 101 connected to the cleaning filter device 1. The cleaning filter device 1 includes a filter material 10 and a container 20 that contains the filter material 10.

(Filter material 10)
3A and 3B are diagrams illustrating a method for manufacturing the filter material 10. First, as shown in FIG. 3A, a mesh-like spacer 13 is layered on an elongated plate-like core member 12 to form a supported spacer 10A supported by the core member 12. The mesh-like spacer 13 is made of a polyolefin polymer material. It is particularly preferable to use a mesh using fibers made of polypropylene (PP) or polyethylene terephthalate (PET) as the spacer 13. The opening area (hole diameter) of the mesh is 1.5 mm to 2.5 mm, and the fiber diameter is 0.4 mm to 0.6 mm.
In the embodiment, the core member 12 is inserted into the bag-shaped (cylindrical) spacer 13, and the spacer 13 is supported by the core member 12. However, this is not limited to the above, and the front and back surfaces of the core member 12 may be wrapped with the planar spacer 13. Furthermore, the spacer 13 may be disposed so as to overlap only one surface of the core member 12.

Next, as shown in FIG. 3(b), a porous hollow fiber 14 is wound around the outer periphery of the supported spacer 10A.
At this time, the hollow fibers 14 are wound so as to extend in the short-side direction S of the supported spacer 10A. That is, the hollow fibers 14 are wound from one end to the other end in the short-side direction S on one side of the supported spacer 10A, and the direction is changed at the other end in the short-side direction S, and on the other side of the supported spacer 10A, the hollow fibers 14 are wound from the other end in the short-side direction to one end, and the direction is changed at the one end in the short-side direction. This is repeated to wind the hollow fibers 14 around the outer periphery of the supported spacer 10A. At this time, it is preferable to wind the hollow fibers 14 so that adjacent hollow fibers 14 do not overlap each other and without any gaps.
The winding of the hollow fibers 14 is then advanced from one side to the other side in the longitudinal direction L of the supported spacer 10A, until the hollow fibers 14 are wound over substantially the entire supported spacer 10A.

Next, as shown in FIG. 3(c), the core member 12 is removed from one side in the longitudinal direction L of the supported spacer 10A around which the hollow fibers 14 are wound, forming a hollow fiber wound body 10B in which the hollow fibers 14 are wound around the outer periphery of the spacer 13.

Then, as shown in FIG. 3(d), the hollow fiber wound body 10B is wound from one side to the other in the longitudinal direction L to form a cylindrical filter material 10 wound in a roll.

In the filter material 10 manufactured in this manner, when the hollow fibers 14 are wound around the spacer 13 with no overlaps and no gaps, the hollow fibers 14 are evenly arranged on the surface of the spacer 13. Then, even when the filter material 10 is wound into a roll into a cylindrical shape, the hollow fibers 14 are arranged without bias, so no uneven filtering occurs.
Since the hollow fibers 14 are wound around the spacer 13, even when the core member 12 is removed and the hollow fibers 14 are wound into a cylindrical shape by rolling, the hollow fibers 14 maintain their alignment, so that no uneven filtering occurs.
Furthermore, since the hollow fibers 14 are wound around the spacer 13, the hollow fibers 14 are prevented from sticking to each other. And, since the spacer 13 is in a mesh shape, pressure loss during filtering can be suppressed. Furthermore, the amount of hollow fibers 14 corresponding to the spacer 13 can be reduced.

Figure 4 is an exploded perspective view of the cleaning filter device 1. Figure 5 is a partially enlarged view of Figure 2. The container 20 includes a first container 20A arranged on the upstream side (inlet side) of the fluid, and a second container 20B arranged on the downstream side (outlet side) of the fluid.

(First container 20A)
The first container 20A comprises a cylindrical first tubular portion 23, a disk-shaped first end surface portion 24 covering the inlet side, which is one axial end of the first tubular portion 23, and a fluid inlet (first fluid inlet/outlet) 25 extending axially from the center of the first end surface portion 24 upstream.

(First connecting part 30A)
A first connecting portion 30A is provided on the outer surface on the downstream side, which is the other end of the first cylindrical portion 23. The first connecting portion 30A is a portion that is connected to a second connecting portion 30B of the second container 20B, which will be described later.
In this embodiment, the first connecting portion 30A includes, from the downstream side, engaging protrusions 32 provided at eight evenly spaced locations in the circumferential direction, and a ring-shaped protrusion 33 that is provided upstream of the engaging protrusions 32 and extends continuously in the circumferential direction. The number of engaging protrusions 32 is not limited to eight, and may be more or less than eight. Furthermore, the ring-shaped protrusion 33 may be discontinuous and not continuous in the circumferential direction.
The amount of protrusion of the engaging protrusion 32 from the outer surface of the first cylindrical portion 23 increases from the downstream side to the upstream side. That is, a slope 34 that becomes higher from the downstream side to the upstream side is formed on the outer surface of the engaging protrusion 32.

(Second container 20B)
The second container 20B comprises a cylindrical second tubular portion 26, a disk-shaped second end surface portion 27 covering the outlet side, which is the other axial end of the second tubular portion 26, and a fluid outlet (second fluid inlet/outlet) 28 extending axially downstream from the center of the second end surface portion 27.

(Second connecting part 30B)
The second connecting portion 30B is provided at one end of the second cylindrical portion 26 and is connected to the first container 20A.
The second connecting portion 30B includes eight engagement holes 37 provided at equal intervals in the circumferential direction in correspondence with the engagement protrusions 32 of the first cylindrical portion 23, and a tip portion 38 provided upstream of the engagement holes 37. Similarly to the engagement protrusions 32, the number of the engagement holes 37 is not limited to eight.

(Protrusion)
6 is a perspective view of the second container 20B as viewed from the inside. A protrusion 60 having slits 61 formed along the circumference and discontinuously is provided on the outer periphery of the inside surface of the second end surface portion 27 of the second container 20B. The slits 61 are provided at six locations evenly spaced in the circumferential direction. However, the number of locations is not limited to six, and may be more or less than six.

(O-ring)
As shown in FIGS. 2 and 5, an O-ring 62 (not shown in FIG. 6) is fitted over the outer periphery of the protrusion 60. As shown in FIG.

As described above, the filter material 10 with the hollow fibers 14 wound around the spacer 13 is first housed in the first container 20A. The downstream end of the filter material 10 is then fixed to the first container 20A by bonding with a urethane adhesive. The fixing method can be, for example, centrifugal potting. The downstream opening of the first container 20A is then covered with the second container 20B, and the first connecting portion 30A and the second connecting portion 30B are connected.
At this time, the first connecting portion 30A and the second connecting portion 30B are connected as follows.
As the second tubular portion 26 is inserted around the outer periphery of the first tubular portion 23, the diameter of the tip portion 38 of the second tubular portion 26 expands along the slope 34 of the engaging protrusion 32. Then, when the tip portion 38 of the second tubular portion 26 climbs over the slope 34 of the engaging protrusion 32, the tip portion 38 of the second tubular portion 26 fits into the recess between the ring-shaped protrusion 33 and the engaging protrusion 32. This connects the first connecting portion 30A and the second connecting portion 30B, and the filter material 10 is stored in the internal space of the container 20.

2 and 5, when the first container 20A and the second container 20B are connected, the O-ring 62 is pressed by the end face 23a of the first cylindrical portion 23 and the inner surface 27a of the second end portion, and is in close contact with the end face 23a and the inner surface 27a. This maintains airtightness (liquid-tightness) between the internal space formed by the first container 20A and the second container 20B and the external space.

(Device-side first detachable portion 40A)
2 and 4, an apparatus-side first detachable part 40A is formed on the cylindrical fluid inlet 25 that extends from the center of the first end surface part 24 of the first container 20A to one side, i.e., the upstream side, and has a smaller diameter than the first tube part 23. The apparatus-side first detachable part 40A includes a slot part 41 provided at the tip of the fluid inlet 25, an operating protrusion 42 provided on the outer surface of the fluid inlet 25 on the first end surface part 24 side beyond the slot part 41 and protruding radially outward, and an operating member 43 inserted into the slot part 41 and movable in a radial direction perpendicular to the axial direction P of the apparatus-side first detachable part 40A.

7 is a diagram showing a state in which the operating member 43 is disassembled from the device-side first detachable portion 40A. The operating member 43 includes an insertion portion 44 inserted into the slot portion 41, a pressing portion 45 extending from a part of the outer periphery of the insertion portion 44 in a direction perpendicular to the insertion portion 44 (the axial direction P of the first cylindrical portion 23), and a biasing portion 46 extending from the inner diameter side of the pressing portion 45 in the insertion portion 44 and substantially parallel to the insertion portion 44 at a certain distance from the insertion portion 44.
A substantially elliptical through hole 47 is formed in the insertion portion 44. The minor axis r1 of the through hole 47 is substantially equal to the inner diameter r2 of the fluid inlet 25.
When the operating member 43 is inserted into the slot portion 41, the biasing portion 46 comes into contact with the operating protrusion 42. At this time, of the inner surface of the through hole 47 provided in the insertion portion 44, the surface in the major diameter direction opposite to the side where the biasing portion 46 is provided becomes a locking surface 49 that locks the second detachable member 80 described later.

(Apparatus side second detachable section 50B)
4, an apparatus-side second detachable portion 50B is formed on the cylindrical fluid outlet 28 that extends from the center of the second end surface portion 27 of the second container 20B toward the downstream side, which is the other side, and has a smaller diameter than the second tubular portion 26. The apparatus-side second detachable portion 50B includes a first circumferential groove 51 provided on the outer periphery on the base end side of the fluid outlet 28, and a second circumferential groove 52 provided on the outer periphery on the tip end side of the fluid outlet 28. An O-ring 53 is attached to the second circumferential groove 52.

(Second detachable member 80)
2, an upstream tube 101U is connected to the first device-side detachable part 40A on the inlet side of the cleaning filter device 1. A second detachable member 80 having a tube-side second detachable part 50A having the same structure as the device-side second detachable part 50B on the outlet side of the cleaning filter device 1 is attached to the upstream tube 101U.
The second detachable member 80 comprises an insertion portion 81 that is inserted into the upstream tube 101U, an abutment portion 82 that abuts against the tip of the upstream tube 101U, and a tube side second detachable portion 50A that extends outside the upstream tube 101U from the abutment portion 82.
The tube-side second detachable part 50A has an outer diameter that allows it to be inserted into the inner diameter side of the device-side first detachable part 40A, and includes a first circumferential groove 51 provided on the outer periphery on the upstream side and a second circumferential groove 52 provided on the outer periphery on the downstream side. An O-ring 53 is attached to the second circumferential groove 52. Note that the same reference numerals are used for the same parts of the tube-side second detachable part 50A as those of the device-side second detachable part 50B.
In addition, the locking surface 49 provided on the operating member 43, the pressing portion 45 provided on the operating member 43, and a first circumferential groove 51 of the second device side detachable portion 50B or the second tube side detachable portion 50A described later constitute a locking mechanism that locks and unlocks the second device side detachable portion 50B or the second tube side detachable portion 50A to the first tube side detachable portion 40B or the first device side detachable portion 40A.
That is, in this embodiment, the locking mechanism is capable of locking and unlocking the first tube side detachable part 40B and the second tube side detachable part 50A or the second device side detachable part 50B, and is also capable of locking and unlocking the first device side detachable part 40A and the second tube side detachable part 50A.

(Attaching the device)
The tube side second detachable part 50A provided on the second detachable member 80 of the upstream tube 101U and the device side first detachable part 40A provided on the fluid inlet 25 of the cleaning filter device 1 are attached as follows.
8A to 8C are diagrams illustrating a procedure for mounting the tube-side second detachable part 50A provided on the second detachable member 80 of the upstream tube 101U to the apparatus-side first detachable part 40A of the cleaning filter apparatus 1. FIG.
8(a), when the tube-side second detachable part 50A of the second detachable member 80 is not inserted into the device-side first detachable part 40A of the cleaning filter device 1, the biasing part 46 abuts against the operating protrusion 42. At this time, on the lower side in the figure, the position of the locking surface 49 of the through hole 47 provided in the insertion part 44 is the position P1 shown in the figure.

As shown in FIG. 8(b), when the tube-side second detachable part 50A of the second detachable member 80 is inserted into the device-side first detachable part 40A of the cleaning filter device 1, the tip of the tube-side second detachable part 50A comes into contact with the locking surface 49, pushing the locking surface 49 downward from the position P1 shown in the figure.

As a result, as shown in FIG. 8(c), the tip of the urging portion 46 cannot move downward because it is in contact with the operating protrusion 42, but the base end of the urging portion 46 moves downward as shown by the arrow in the figure, and the urging portion 46 bends. The position of the locking surface 49 then moves from position P1 to position P2 as shown. As a result, the tube side second detachable portion 50A of the second detachable member 80 can be inserted into the device side first detachable portion 40A of the cleaning filter device 1.

As shown in Figure 8 (d), when the tube side second detachable part 50A of the second detachable member 80 is inserted up to the tip of the device side first detachable part 40A of the cleaning filter device 1 and the first circumferential groove 51 of the tube side second detachable part 50A reaches the position of the insertion part 44, the restoring force of the biasing part 46 moves the locking surface 49 from position P2 to position P1 in the figure.
As a result, the locking surface 49 fits into the first circumferential groove 51, creating a locked state in which the first detachable part 40A on the device side and the second detachable part 50A on the tube side are prevented from coming loose, and the cleaning filter device 1 and the upstream tube 101U are connected.
In this way, the second detachable member 80 of the upstream tube 101U and the first detachable device side part 40A of the cleaning filter device 1 can be attached with a single touch by simply inserting the second detachable member 80 of the upstream tube 101U into the first detachable device side part 40A of the cleaning filter device 1. Therefore, the upstream tube 101U and the cleaning filter device 1 can be easily connected.

(First detachable member 90)
2, a downstream tube 101D is connected to the second device-side detachable part 50B on the outlet side of the cleaning filter device 1. A first detachable member 90 having a tube-side first detachable part 40B having the same structure as the first device-side detachable part 40A on the inlet side of the cleaning filter device 1 is attached to the downstream tube 101D.
As shown in FIGS. 2 and 4, the first detachable member 90 includes an insertion portion 91 that is inserted into the downstream tube 101D, and a first tube detachable portion 40B that extends outward from the tip of the downstream tube 101D.
The tube-side first detachable part 40B has an inner diameter that allows it to be inserted into the outer diameter side of the device-side second detachable part 50B, and similarly to the device-side first detachable part 40A, includes a slot part 41, an operating protrusion 42, and an operating member 43. Note that the same reference numerals are used for the same parts of the tube-side first detachable part 40B as those of the device-side first detachable part 40A.

(Attaching the device)
The attachment on the downstream side between the tube side first detachable part 40B provided on the first detachable member 90 of the downstream tube 101D and the apparatus side second detachable part 50B provided at the fluid outlet 28 of the cleaning filter device 1 is similar to the attachment on the upstream side described above between the tube side second detachable part 50A provided on the second detachable member 80 of the upstream tube 101U and the apparatus side first detachable part 40A provided at the fluid inlet 25 of the cleaning filter device 1, so description thereof will be omitted.
The first tube-side detachable part 40B of the downstream tube 101D and the second apparatus-side detachable part 50B of the cleaning filter device 1 can be attached with a single touch by simply inserting the first tube-side detachable part 40B of the downstream tube 101D into the second apparatus-side detachable part 50B of the cleaning filter device 1. This makes it easy to connect the downstream tube 101D to the cleaning filter device 1.

(Priming)
Returning to FIG. 1, during priming, the blood circulation circuit 100 is constructed as a circulation circuit that does not pass through the patient's body.
First, a tube 102 with a bottle needle 103 attached to its tip is connected to the blood storage tank 3, and the bottle needle 103 is connected to a container (not shown) for priming such as physiological saline. When the blood pump 4 is driven, a priming fluid such as physiological saline flows into the blood storage tank 3. The fluid flowing into the blood storage tank 3 is sucked by the blood pump 4, passes through the flow path L1, and is separated into two directions, flow paths L2 and L3, through the artificial lung 5. The fluid passing through one of the flow paths L2 enters the blood filter device 6. The fluid passing through the other flow path L3 is further separated into two directions, flow paths L4 and L5. The fluid in the flow path L4 enters the blood filter device 6, merges with the fluid in the flow path L2, flows through the flow path L6, and returns to the blood storage tank 3. The fluid in the flow path L5 is further separated into two directions, flow paths L7 and L8. The fluid in the flow path L7 flows through the cleaning filter device 1.
Here, foreign matter in the blood circulation circuit 100 that flows with the fluid is removed in the cleaning filter device 1. The fluid from which the foreign matter has been removed is separated into flow paths L9 and L10, and then merges and flows again through flow path L7, merges with the fluid in flow path L8, flows through flow path L5, and flows into the blood reservoir 3. Air that was present in the blood circulation circuit 100 also flows with the fluid and flows into the blood reservoir 3.

As shown in FIG. 5, when the first container 20A and the second container 20B are connected, the O-ring 62 is pressed by the end face 23a of the first cylindrical portion 23 and the inner surface 27a of the second side end portion, thereby maintaining airtightness (liquid-tightness) between the internal space formed by the first container 20A and the second container 20B and the external space.
In this state, when the priming fluid is flowed, the fluid flows as shown by the arrows in the figure. Here, there is a possibility that air bubbles 70 remain in the small gap generated between the O-ring 62 and the protrusion 60.

However, in the embodiment, as shown in Fig. 6, a slit 61 is formed in the protrusion 60. Therefore, as shown by the arrow in Fig. 6, a part of the fluid that has flowed to the inner surface side of the second container 20B can pass through the slit 61 and flow through the gap generated between the O-ring 62 and the protrusion 60. Therefore, the air bubbles 70 between the O-ring 62 and the protrusion 60 can also flow out together with the fluid and flow into the blood reservoir 3.
Once the priming is completed, the blood pump 4 is stopped.

(Removal of cleaning filter device 1)
9A and 9B are diagrams illustrating the procedure for removing the cleaning filter device 1. After priming is completed, as shown in Fig. 9A, first, the cleaning filter device 1 is clamped from above and below. Then, the tube-side second detachable part 50A of the upstream tube 101U on the upstream side is removed from the device-side first detachable part 40A of the cleaning filter device 1.
FIG. 10 is a diagram for explaining the procedure for removing the second tube-side detachable part 50A from the first apparatus-side detachable part 40A.
First, when the pressing portion 45 is pressed in the direction of the arrow shown in Fig. 10(a), the insertion portion 44 moves downward in the figure. This causes the locking surface 49 of the through hole 47 provided in the insertion portion 44 to separate from the bottom surface of the first circumferential groove 51, and the lock between the first device-side detachable portion 40A and the second tube-side detachable portion 50A is released, resulting in an unlocked state. Then, as shown in Fig. 10(b), it becomes possible to pull out the second tube-side detachable portion 50A from the first device-side detachable portion 40A.

As described above, the tube-side second detachable portion 50A of the second detachable member 80 of the upstream tube 101U can be removed from the device-side first detachable portion 40A of the cleaning filter device 1 with a single touch by simply pressing the pressing portion 45 and pulling the second detachable member 80 of the upstream tube 101U out of the device-side first detachable portion 40A of the cleaning filter device 1. Therefore, the upstream tube 101U can be easily removed from the cleaning filter device 1.

In addition, the removal of the first tube-side detachable part 40B of the downstream tube 101D from the second device-side detachable part 50B of the cleaning filter device 1 can be achieved in a single touch operation, similar to the removal of the second detachable member 80 of the upstream tube 101U from the first device-side detachable part 40A of the cleaning filter device 1, by pressing the pressing part 45 and pulling the first tube-side detachable part 40B of the downstream tube 101D out of the second device-side detachable part 50B of the cleaning filter device 1. This makes it easy to remove the downstream tube 101D from the cleaning filter device 1.

Then, as shown in Figure 9 (b), the cleaning filter device 1 detached from the tube side second detachable part 50A of the second detachable member 80 inserted into the upstream tube 101U and the tube side first detachable part 40B of the first detachable member 90 inserted into the downstream tube 101D is removed from the blood circulation circuit 100.
9(c), the second tube-side detachable portion 50A of the second detachable member 80 of the upstream tube 101U is connected to the first tube-side detachable portion 40B of the downstream tube 101D. At this time, the second tube-side detachable portion 50A and the first tube-side detachable portion 40B can be connected with one touch as described above. Therefore, the upstream tube 101U and the downstream tube 101D can be easily connected.

After connecting the tubes, the flow paths L9 and L10 shown in FIG. 1 are cut midway and a catheter is connected to the cut sections, so that the blood circulation circuit 100 becomes an artificial heart-lung system in which foreign matter has been removed and no air bubbles remain.

Furthermore, when the fluid treatment device is an artificial lung, the fluid treatment device may become clogged during use, in which case it may be necessary to replace the clogged fluid treatment device or the entire blood circuit including the fluid treatment device other than the artificial lung.
In this case too, it is possible to easily remove a clogged fluid treatment device from between the upstream tube 101U and the downstream tube 101D and to install a different fluid treatment device, which further has the effect of reducing the cost of replacing the entire extracorporeal circulatory system including the circuit.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be embodied in various forms.
For example, the structure of the locking mechanism is not limited to the locking surface 49 and the operating member 43 as in the embodiment, but may be other structures as long as they are detachable with a single touch.

In the embodiment, the first device side detachable part 40A and the first tube side detachable part 40B are provided at the fluid inlet 25 of the cleaning filter device 1 and the end of the downstream tube 101D, and the second tube side detachable part 50A and the second device side detachable part 50B are provided at the end of the upstream tube 101U and the fluid outlet 28 of the cleaning filter device 1.
However, without being limited to this, the second tube side detachable part 50A and the second device side detachable part 50B may be provided at the end of the downstream tube 101D and the fluid inlet 25 of the cleaning filter device 1, and the first device side detachable part 40A and the first tube side detachable part 40B may be provided at the fluid outlet 28 of the cleaning filter device 1 and the end of the upstream tube 101U.

1. Cleaning filter device (fluid treatment device)
5 Oxygenator 10 Filter material 10A Supported spacer 10B Hollow fiber wound body 11 Urethane resin 12 Core member 13 Spacer 14 Hollow fiber 20 Container 20A First container 20B Second container 23 First cylindrical portion 23a End surface 24 First end surface portion 25 Fluid inlet (first fluid inlet/outlet)
26 Second cylindrical portion 27 Second end surface portion 27a Inner surface 28 Fluid outlet (second fluid inlet/outlet)
30A First connecting portion 30B Second connecting portion 32 Engagement protrusion 33 Ring-shaped protrusion 34 Slope 37 Engagement hole 38 Tip portion 40A Device-side first detachable portion 40B Tube-side first detachable portion 41 Slot portion 42 Operation protrusion 43 Operation member (lock mechanism)
44 Insertion part (locking mechanism)
45 Pressing portion 46 Pressing portion 47 Through hole 49 Locking surface (locking mechanism)
50A: Tube side second detachable portion 50B: Device side second detachable portion 51: First circumferential groove (locking mechanism)
60: protrusion 61: slit 62: O-ring 70: air bubble 80: second detachable member 81: insertion portion 82: abutment portion 90: first detachable member 91: insertion portion 100: blood circulation circuit (extracorporeal circulation circuit)
101U Upstream tube (second tube)
101D downstream tube (first tube)

Claims (5)

A filter device used during priming of an extracorporeal circulation circuit,
a first container including a first cylindrical portion, a first end surface portion covering one end of the first cylindrical portion, and a first fluid inlet/outlet extending from the first end surface portion in an axial direction of the first cylindrical portion;
a second container having a second cylindrical portion, one end of which is connected to the other end of the first container, a second end surface portion covering the other end of the second cylindrical portion, and a second fluid inlet/outlet extending from the second end surface portion in the axial direction of the second cylindrical portion, and a protrusion portion having a slit provided circumferentially and discontinuously on the outer periphery of an inner surface of the second end surface portion;
an O-ring that is bridged over an outer periphery of the protrusion and is held between an end face of the first cylindrical portion and an inner face of the second end face portion;
A filter material is contained in an internal space formed by connecting the first container and the second container to each other,
The slits are formed in a plurality of positions evenly spaced in the circumferential direction ,
Air bubbles between the O-ring and the protrusion can flow out through the slit together with the fluid flowing into the inner surface side of the second container.
Filter device. a portion of the inner surface of the second end surface portion, the portion of the slit, and a portion of the inner surface of the second end surface portion where the O-ring is held are flush with each other without any step being formed;
The filter device of claim 1 . The slit does not communicate with the outside of the second cylindrical portion when the O-ring is not held.
3. A filter device according to claim 1 or 2. The first cylindrical portion is disposed on a fluid inlet side,
The second cylindrical portion is disposed on the fluid outlet side.
The filter device according to any one of claims 1 to 3 . The extracorporeal circuit includes an oxygenator.
The filter device according to any one of claims 1 to 4 .

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