JP4695703B2 - Chamber for extracorporeal circuit - Google Patents

Description

  The present invention relates to a chamber for an extracorporeal circuit that is installed in the middle of an extracorporeal circuit that circulates and processes a fluid such as blood.

  For example, in an extracorporeal circuit such as a hemodialysis circuit, a cardiopulmonary blood circuit, etc., the pressure of fluid such as blood is detected to control the flow rate, and when returning blood to a patient, air bubbles are separated, A chamber called a drip chamber is arranged to block air, foreign matter, and blood clots in the circuit and prevent inflow into the body.

  As a conventional chamber of this type, in Patent Document 1 below, a chamber body, an inflow port of a liquid such as blood provided upward at the bottom of the chamber body, and a bottom of the chamber body are provided. An extracorporeal circuit chamber having an outlet for fluid such as blood is disclosed. Further, a filter having a substantially triangular pyramid shape in which the bottom portion has a circular shape and the diameter gradually decreases upward is disposed in the chamber body so as to surround the outlet at the bottom portion of the chamber body.

  According to this chamber, blood flows into the chamber body upward from the inlet at the bottom of the chamber body, flows upward to the chamber body, reverses above the chamber body, and changes its direction by 180 degrees. And then flows out of the outlet through the filter. As a result, it is difficult for air bubbles to be mixed into the blood, it is possible to suppress the rise of the blood level due to the air bubbles, and the extracorporeal circulation can be performed stably over a long period of time.

JP 2008-200194 A

  However, in the case of the chamber of Patent Document 1 above, blood that has flowed into the chamber body from the inlet at the bottom of the chamber body flows upward into the chamber body, reverses and flows down, and passes through the filter. Although it flows out from the outflow port, there is a tendency that blood tends to stay in the periphery of the filter at the bottom of the chamber body. Therefore, it has been desired to develop a chamber that can more reliably prevent blood coagulation and plasma separation.

  Therefore, the object of the present invention is to make the flow of liquid such as blood in the chamber body smoother, suppress the retention of the liquid such as blood in the chamber body, and effectively prevent the occurrence of blood clots. An object of the present invention is to provide a chamber for an extracorporeal circuit that can be used.

To achieve the above object, the present invention provides a chamber in an extracorporeal circuit for a fluid such as blood,
A chamber body in which a reservoir for blood or the like is formed below and an air layer is formed above;
An outlet for a liquid such as blood provided at the bottom of the chamber body;
A filter disposed in the center of the chamber body, extending in a cylindrical shape along the vertical direction of the chamber body, and a lower end thereof communicating with the outlet,
On the outer periphery of the filter at the bottom of the chamber body, an inlet for a liquid such as blood provided so as to open in a direction along the circumferential direction of the chamber body;
An extracorporeal circulation circuit chamber comprising an air pressure measurement line connected to an upper portion of the chamber body so as to communicate with the air layer.

  According to the above invention, the liquid such as blood flows out from the inlet opening at the bottom of the chamber body along the circumferential direction of the chamber body, so that the liquid such as blood flows while swirling around the outer periphery of the filter. In the process, it passes through the filter and flows out from the outlet. For this reason, it is difficult for liquid such as blood to stay in the chamber body, and the occurrence of blood clots can be prevented more reliably.

  In addition, by measuring the air pressure supplied through the air pressure measurement line, the pressure in the chamber, in other words, the fluid pressure of blood or the like can be measured, thereby ensuring the safety of the pressure in the circuit. it can. Further, by removing a liquid such as blood through a filter, bubbles mixed in the liquid such as blood can be removed.

  In the present invention, it is preferable that the bottom of the chamber body is provided with an inclined surface that rises spirally from the inlet along the outer periphery of the filter. According to this, since the liquid such as blood flowing in from the inlet at the bottom of the chamber rises while flowing along the spiral inclined surface, the vortex around the outer periphery of the filter can be formed more effectively. It is possible to more effectively prevent the retention of liquid such as blood and the coagulation of blood due to this.

  In the present invention, a guide surface that is inclined obliquely downward toward the center of the outlet provided at the bottom of the chamber body is formed on the inner peripheral edge of the inclined surface along the outer periphery of the filter. It is preferable. According to this, a space in which the liquid such as blood flows on the lower outer periphery of the filter is prevented, the retention of the liquid such as blood is prevented, and the liquid such as blood flowing along the inclined surface is guided by the guide surface. While flowing smoothly into the filter.

  In the present invention, it is preferable that the chamber body has a cylindrical shape and the filter has a cylindrical shape. According to this, liquid such as blood flowing in from the inlet at the bottom of the chamber flows along the space between the inner periphery of the cylindrical chamber body and the outer periphery of the cylindrical filter, so that the vortex flow is more effective. Can be formed.

  In the present invention, it is preferable that an anticoagulant injecting portion arranged to allow the anticoagulant to flow down along the inner peripheral surface of the peripheral wall is provided at the upper portion of the chamber body. According to this, since the anticoagulant flows down along the inner peripheral surface of the peripheral wall and is mixed into the liquid such as blood, it is possible to prevent bubbles from being mixed into the liquid such as blood.

In the present invention, the chamber body has a cylindrical peripheral wall, a lower cap attached to the lower opening of the peripheral wall, and an upper cap attached to the upper opening of the peripheral wall,
The lower cap is connected to an inlet pipe portion to which a liquid inflow line such as blood is connected; the inlet port communicating with the inlet pipe portion; and an outlet pipe portion to which an outflow line of fluid such as blood is connected; The outflow port communicating with the outlet pipe portion is provided,
The upper cap is provided with the air pressure measurement line connecting part, an anticoagulant injecting part, and a support part of the filter,
It is preferable that the lower end portion of the filter is supported by the outlet pipe portion of the lower cap, and the upper end portion thereof is supported by the support portion of the upper cap.

  According to this, since the chamber main body is composed of the cylindrical peripheral wall, the lower cap, and the upper cap, each part can be easily molded and the assembly operation can be facilitated. Further, the upper and lower ends of the filter are supported by the upper and lower caps, and the filter can be firmly fixed.

  According to the present invention, a liquid such as blood flows out from the inlet opening at the bottom of the chamber body along the circumferential direction of the chamber body, and the blood or the like rises while flowing around the outer periphery of the filter like a vortex. In this process, the liquid permeates into the filter and flows out from the outlet, so that it is difficult for liquids such as blood to stay in the chamber body, and the generation of blood clots can be prevented more reliably. it can.

It is a disassembled perspective view of the chamber for extracorporeal circulation circuits of this invention. It is a perspective view of the chamber. It is a perspective view at the time of fracture | rupturing a part in the same chamber. The principal part of the chamber is shown, (A) is a cross-sectional perspective view in the AA arrow line of (B), (B) is a top view of the principal part. It is a perspective view which shows the shape of the bottom part of the chamber main body of the chamber. It is a schematic explanatory drawing of the extracorporeal circuit in which the chamber is arrange | positioned.

  Hereinafter, with reference to FIGS. 1-6, one Embodiment of the chamber for extracorporeal circulation circuits of this invention is described.

  The extracorporeal circuit chamber (hereinafter referred to as “chamber”) according to the present invention is disposed in the extracorporeal circuit 1 (hereinafter referred to as “circuit 1”) as shown in FIG. The chambers in this embodiment are arranged at predetermined locations of the extracorporeal circuit 1 as the first chamber 10 and the second chamber 20. Further, the circuit 1 in this embodiment means a circuit that takes out blood from the body, performs a predetermined process, and returns it to the body, such as a hemodialysis circuit, a cardiopulmonary blood circuit, and the like. Furthermore, it is suitable for a continuous blood filtration apparatus that performs dialysis at a slow flow rate over a long period of time.

  First, the circuit 1 will be described. FIG. 6 shows a schematic explanatory diagram when the circuit 1 is applied to a hemodialysis circuit. In the same figure, A is a blood inflow part (blood removal part) into which the blood from a patient flows in, and B is a blood return part (blood return part) which returns the purified blood to a patient.

  The blood inflow part A is connected to a tube 4 connected to a blood inflow part 3 a of a filter (dialyzer) 3. In the middle of the tube 4, a pillow 6, a blood pump 7, and a first chamber 10 are arranged from the upstream side. In addition, a syringe pump 5 for adding an anticoagulant or the like into the blood is disposed above the first chamber 10, and this attaches a tube 69 to an anticoagulant injection part 66 of the first chamber 10 described later. (Refer to FIG. 1). Further, a pressure gauge 12 is connected to the first chamber 10 via a protective filter 11, and the pressure of the air layer above the first chamber 10 is measured and the blood pump 7 is controlled to thereby filter the filter 3. The liquid feeding pressure is adjusted.

  The blood that has flowed into the filter 3 through the tube 4 passes through a hollow fiber (not shown) in the filter 3 and is connected to the end of the tube 14 from the blood outflow part 3b. To be sent back to. A second chamber 20 is disposed in the middle of the tube 14. Similar to the first chamber 10, a pressure gauge 22 is connected to the second chamber 20 via a protective filter 21 so that the liquid feeding pressure to the patient can be detected.

  Further, this circuit 1 removes waste products and electrolytes in the blood, and also supplies a dialysate line L1 for supplying dialysate to supplement the electrolyte, and a filtrate containing waste products, electrolytes, water, etc. removed from the blood. A filtrate line L2 for discharging the fluid to the outside of the body and a replacement fluid line L3 for supplying a replacement fluid for replenishing the body fluid component removed from the body.

  The dialysate line L1 has a tube 23, one end of which is connected to a pack 24 filled with dialysate, and the other end is connected to a dialysate inflow portion 3c of the filter 3. And the dialysate which flowed in into the filter 3 through the dialysate inflow part 3c passes the outer space of the hollow fiber in the filter 3, and is mentioned later from the dialysate outflow part 3d of the filter 3 It is taken out through the tube 27 of the filtrate line L2. In the middle of the tube 23, a measuring container 25 for measuring the flow rate of the dialysate and a dialysate pump 26 for feeding the dialysate are attached.

  The filtrate line L2 has a tube 27, one end of which is connected to the dialysate outflow part 3d of the filter 3, and the other end is disposed in the waste liquid container 35. A third chamber 30 is disposed in the middle of the upstream side of the tube 27 (filter 3 side). A pressure gauge 32 is connected to the third chamber 30 via a protective filter 31 so that the drainage pressure of the filtrate can be detected. The filtrate that flows out from the dialysate outflow portion 3d passes through the tube 27 and is collected in the waste liquid container 35. In addition, a measuring container 33 for measuring the flow rate of the filtrate and a filtrate pump 34 for discharging the filtrate are attached in the middle of the downstream side of the tube 27 (the waste liquid container 35 side). .

  The replacement fluid line L3 has a tube 36, one end of which is connected to a pack 37 filled with the replacement fluid, the other end is connected to the upper portion of the second chamber 20, and the replacement fluid passes through the tube 36 to the second chamber. 20 is supplied. A measuring container 38 for measuring the flow rate of the replacement fluid and a replacement fluid pump 39 for feeding the replacement fluid are attached to the tube 36.

  The basic operation of the circuit 1 will be described. Blood taken out from the blood inflow part A of the patient is supplied to the first chamber 10 through the tube 4 by the blood pump 7 and is filtered from the first chamber 10. 3 flows into the hollow fiber.

  On the other hand, the dialysate flows from the pack 24 through the tube 23 and flows into the outer space of the hollow fiber from the lower part of the filter 3 by the dialysate pump 26. And in the filter 3, the waste in blood moves to the dialysate side through a hollow fiber membrane, and blood is purified.

  The blood purified through the filter 3 passes through the tube 14 and flows into the second chamber 20. Also, the replacement fluid supplied from the pack 37 through the tube 36 by the replacement fluid pump 39 flows into the second chamber 20 and the replacement fluid is added to the purified blood. The blood thus purified is returned to the blood return part B of the patient through the tube 14.

  Next, the extracorporeal circuit chamber of the present invention disposed in the middle of the circuit 1 having the above structure will be described with reference to FIGS. In this embodiment, the first chamber 10 and the second chamber 20 through which blood passes form a chamber according to the present invention. That is, since these chambers 10 and 20 are portions through which blood passes, adopting the structure described below makes it difficult for blood to stay and prevent the occurrence of blood clots and the like. . Since the first chamber 10 and the second chamber 20 have substantially the same structure, the first chamber 10 will be described in detail here.

  As shown in FIGS. 1 and 2, the first chamber 10 (hereinafter simply referred to as “chamber 10”) has a reservoir E for liquid such as blood formed in the lower part and an air layer F formed in the upper part (see FIG. 1). 2), and has a substantially cylindrical chamber body 40 whose upper and lower portions are closed. The chamber main body 40 includes a cylindrical peripheral wall 41, a lower cap 50 attached to a lower opening 43 (see FIG. 4A) of the peripheral wall 41, and an upper opening 45 of the peripheral wall 41 (FIG. A) and an upper cap 60 to be mounted.

  As shown in FIGS. 4 and 5, the lower cap 50 is provided with a disc-shaped bottom 51 covering the lower opening 43 and an upper outer periphery of the peripheral wall 41. And a cylindrical lead-out pipe portion 54 protruding from the center of the bottom surface of the bottom portion 51. The outlet pipe portion 54 communicates with a circular outlet 53 that opens at the center of the inner surface of the bottom portion 51. In addition, a circular inlet 55 for allowing a liquid such as blood to flow into the chamber body 40 is formed at one location around the outlet 53, and a cylindrical introduction pipe is formed in the inlet 55. The part 56 is connected so as to protrude from the bottom surface of the lower cap 50. The inflow port 55 connected to the introduction pipe portion 56 is formed such that a lower opening 55a is opened vertically and an upper opening 55b is opened in a direction along the circumferential direction in the chamber body 40.

  As shown in FIGS. 2 and 3, a tube 4 a constituting an outflow line of blood or the like is connected to the outlet pipe portion 54, and a tube constituting an inflow line of blood or the like is connected to the introduction pipe portion 56. 4b is connected.

  A filter support cylinder 15 that supports a lower end portion of a filter 70 to be described later is attached to the upper end portion of the tube 4 a connected to the outlet pipe portion 54. The filter support cylinder 15 includes a base portion 15a attached to the outer periphery of the upper end of the tube 14a, and a support portion 15b having a diameter smaller than that of the base portion 15a.

  As shown in FIGS. 3 to 5, the bottom 51 of the lower cap 50 is spirally formed from the inflow port 55 along the outer periphery of a cylindrical filter 70 described later disposed at the center of the chamber body 40. An inclined surface 57 is provided.

  In this embodiment, the inclined surface 57 has a lowest surface located in front of the upper opening 55b of the inflow port 55, and gradually protrudes higher from the front of the upper opening 55b along the circumferential direction of the outflow port 53. The shape is a spiral (see FIGS. 4B and 5). The upper opening 55b is opened on an end surface 58 formed by a step between the highest projecting surface and the lowest surface.

  By providing such an inclined surface 57, the liquid such as blood flowing into the chamber body 40 from the upper opening 55b of the inflow port 55 is allowed to pass through the inner periphery of the peripheral wall 41 as shown by the arrow in FIG. It rises while flowing spirally along the surface and the inclined surface 57.

  Further, as shown in FIGS. 1 to 5, the inner peripheral edge of the inclined surface 57 along the outer periphery of the filter 70 is directed toward the center of the outlet 53 of the bottom 51 of the lower cap 50 constituting the chamber body 40. Thus, a guide surface 57a inclined obliquely downward is formed. In this embodiment, the guide surface 57a has a shape (conical shape) that is notched in an obliquely downward direction so as to reach the outer peripheral edge of the outflow port 53 from the inner peripheral edge of the inclined surface 57 that rises spirally. (See FIGS. 4A and 5). This guide surface 57a secures a space for blood or the like to flow into the lower outer periphery of the filter 70, prevents blood or the like from staying in the gap between the filter 70 and the inclined surface 57, and is inclined. A liquid such as blood flowing along the surface 57 can be guided to easily flow into the filter 70.

  On the other hand, the upper cap 60 attached to the upper opening 45 of the peripheral wall 41 is provided so as to hang downward from the disk-shaped ceiling 61 covering the upper opening 45 and the outer peripheral edge of the ceiling 61, and 41 and a cover portion 62 covering the upper outer periphery of 41. A cylindrical filter support portion 63 for supporting the upper end portion of the filter 70 is suspended from the center of the lower surface of the ceiling portion 61.

  In addition, as shown in FIGS. 2 and 3, at a position along the peripheral edge of the disk-shaped ceiling portion 61, a cylindrical replacement fluid line connecting portion 64, an air pressure measuring line connecting portion 65, an anticoagulant The injection part 66 is connected so as to protrude from the upper surface of the ceiling part 61. The lower end portions of the replacement fluid line connecting portion 64, the air pressure measuring line connecting portion 65, and the anticoagulant injecting portion 66 penetrate the ceiling portion 61 of the upper cap 60 and communicate with the chamber body 40. The replacement fluid line connecting part 64, the air pressure measuring line connecting part 65, and the anticoagulant injecting part 66 can be formed integrally with the upper cap 60.

  A tube 8 is connected to the replacement fluid line connecting portion 64 so that a replacement fluid can be supplied into the chamber body 40 as needed. If it is not necessary to supply the replacement fluid from the tube 8, the tube 8 may be closed. In addition, a tube 67 to which the protective filter 11 and the pressure gauge 12 are connected is connected to the air pressure measurement line connecting portion 65. The tube 67 is provided with a three-way valve 68. One opening 68a is connected to the pressure gauge 12, and the other opening 68b is connected to a syringe or the like (not shown) so that the chamber main body 40 is connected. Air or the like can be injected into the inside.

  On the other hand, a tube 69 is connected to the anticoagulant injecting section 66, and the syringe pump 5 shown in FIG. 6 is connected to the tube 69, so that an anticoagulant such as heparin or fusan is injected into the chamber body 40. Can be injected into.

  Further, since the replacement fluid line connecting portion 64 and the anticoagulant injection portion 66 are provided at positions along the periphery of the disk-shaped ceiling portion 61, the replacement fluid and the anticoagulant are contained in the peripheral wall 41. It is designed to flow down the circumference.

  At the center of the chamber body 40 having the above-described structure, a cylindrical filter 70 that extends in a cylindrical shape along the vertical direction of the chamber body 40 and whose lower end communicates with the outlet 53 is disposed. A filter frame 71 is attached to the lower end of the filter 70 (see FIG. 1). As shown in FIG. 3, the upper end portion of the filter 70 is supported by the filter support portion 63 of the upper cap 60, and the filter frame 71 is located at the upper end of the tube 4 a fitted in the outlet tube portion 54. The filter support cylinder 15 is received and supported in the support portion 15b. As a result, the upper and lower ends of the filter 70 are supported and can be firmly fixed in the chamber body 40. At this time, as shown in FIG. 3, the filter support cylinder 15 is fitted into the outlet pipe portion 54 so that the upper end portion of the support portion 15 b matches the upper end surface of the bottom portion 51 of the lower cap 50. It has become. In this embodiment, the lower end portion of the filter 70 is connected to the filter support tube 15 at the upper end of the tube 14a, and the filter support tube 15 is inserted and supported in the outlet tube portion 54 of the lower cap 50. The lower end portion of 70 may be directly connected to the outlet tube portion 54 and supported.

  Further, the chamber body 40 having the above-described structure is composed of three parts including the cylindrical peripheral wall 41, the lower cap 50, and the upper cap 60, so that each part can be molded relatively easily. For example, a spiral inclined surface 57 having a complicated bent shape can be integrally formed with the lower cap 50. Further, the chamber body 40 can be assembled by simply attaching the lower cap 50 to the lower opening 43 of the cylindrical peripheral wall 41 and attaching the upper cap 60 to the upper opening 45 of the peripheral wall 41. Assembly workability can be improved.

  The structure of the first chamber 10 has been described above. In the case of the second chamber 20, the anticoagulant injecting portion 66 is not provided, and the tube 36 constituting the replacement fluid line L3 is connected to the replacement fluid connection portion 64. The replacement fluid can be supplied into the chamber main body 40, and the tube 4a in the outflow line becomes the tube 14a, and the tube 4b in the inflow line becomes the tube 14b.

  Next, the operation of the chamber 10 will be described.

  That is, the blood pumped out by the blood pump 7 flows from the lower opening 55a of the inflow port 55 through the tube 4b of the inflow line, and flows into the chamber body 40 from the upper opening 55b of the inflow port 55. At this time, as shown in FIG. 4B, the upper opening 55b of the inflow port 55 opens in the direction along the circumferential direction of the chamber body 40, so that blood flows along the circumferential direction of the chamber body 40. Inflow. The blood that has flowed in rises while flowing along the outer periphery of the filter 70 like a vortex along the spiral inclined surface 57 provided on the bottom 51 of the chamber body 40 (see FIGS. 4 and 5). In the process, it flows into the inside through the filter 70. Further, a guide surface 57 a having a tapered shape (conical shape) is formed on the inner periphery of the inclined surface 57 so as to reach the outer peripheral edge of the outlet port 53 obliquely downward. On the outer periphery of the lower portion, a space for blood or the like to flow in is ensured, and the liquid such as blood or the like is prevented from staying in the gap between the filter 70 and the inclined surface 57. Can be guided to facilitate the flow into the filter 70.

  The fluid such as blood flowing into the filter 70 flows through the tube 4a of the outflow line to the filter 3 in the circuit 1 shown in FIG. 2, and further passes through the second chamber 20 to finally become the blood of the patient. Returned to return unit B. As a result, a reservoir E for blood or the like is formed in the lower part of the chamber body 40, and an air layer F is formed in the upper part (see FIG. 2).

  As described above, in the chamber 10, the upper opening 55 b of the inflow port 55 is provided so as to open in the direction along the circumferential direction of the chamber main body 40, so that liquid such as blood can be introduced in the circumferential direction of the chamber main body 40. Accordingly, the liquid such as blood flows like a vortex around the outer periphery of the filter 70, so that the blood is less likely to stay in the chamber body 40 and the occurrence of blood clots can be prevented.

  Further, since the inclined surface 57 that rises in a spiral shape is provided at the bottom 51 of the chamber body 40, the blood rises while flowing along the inclined surface 57 when the blood flows in the chamber body 40. Further, the vortex flow around the outer periphery of the filter 70 can be formed more effectively, and the retention of blood and the coagulation caused thereby can be more effectively prevented.

  In addition, by measuring the air pressure supplied through the air pressure measurement line provided in the chamber 10, the pressure in the chamber 10, in other words, the fluid pressure of blood or the like can be measured, and thereby the pressure in the circuit 1 can be measured. Safety can be ensured. Further, by removing a liquid such as blood through the filter 70, bubbles mixed in the liquid such as blood can be removed.

  In addition, the chamber body 40 has a substantially cylindrical shape, and the filter 70 also has a cylindrical shape. Therefore, the blood flowing in from the inlet 55 has the same cylindrical filter 70 as the inner periphery of the cylindrical chamber body 40. Since it flows smoothly along the space between the outer periphery of the vortex, the vortex can be more effectively formed.

  Further, the upper cap 60 of the chamber 10 is provided with an anticoagulant injecting portion 66, to which a tube 69 and a syringe pump 5 are connected. Therefore, an anticoagulant such as heparin or fusan can be injected into the chamber body 40 from the syringe pump 5 through the tube 69 and the anticoagulant injection part 66. In this case, since the anticoagulant flows down along the inner peripheral surface of the peripheral wall 41 and is mixed into the liquid such as blood, it is possible to prevent bubbles from being mixed into the liquid such as blood.

  Conventionally, the syringe pump, the tube, and the anticoagulant injecting portion are provided on the upstream side of the pump 7 of the tube 4b. In such an embodiment, the syringe pump is operated by the action of the pulsating flow generated by the pump 7. This causes a phenomenon in which a liquid such as blood stops or moves at the outlet of the liquid, and thus becomes in a state close to a stagnation, and the anticoagulant reacts with the electrolyte in the blood and tends to cause white turbidity.

  In this embodiment, as described above, the anticoagulant injecting portion 66 is provided in the chamber 10 and the tube 69 and the syringe pump 5 are connected to the chamber 10. Can be solved.

1 Extracorporeal circuit (circuit)
DESCRIPTION OF SYMBOLS 3 Filter 3a Blood inflow part 3b Blood outflow part 3c Dialysate inflow part 3d Dialysate outflow part 4 Tube 4a Tube 4b Tube 5 Syringe pump 6 Pillow 7 Blood pump 8 Tube 10 First chamber 11 Protection filter 12 Pressure gauge 14 Tube 14a Tube 14b Tube 15 Filter support cylinder 15a Base 15b Support 20 Second chamber 21 Protection filter 22 Pressure gauge 23 Tube 24 Pack 25 Metering container 26 Dialysate pump 27 Tube 30 Third chamber 31 Protection filter 32 Pressure gauge 33 Metering container 34 Filter Liquid pump 35 Waste liquid container 36 Tube 37 Pack 38 Metering container 39 Fluid replacement pump 40 Chamber body 41 Surrounding wall 43 Lower opening 45 Upper opening 50 Lower cap 51 Bottom 52 Cover 53 Outlet 54 Outlet pipe 55 Inlet 55a Below Port 55b Upper opening 56 Introduction pipe part 57 Inclined surface 58 Wall surface 60 Upper cap 61 Ceiling part 62 Cover part 63 Filter support part 64 Fluid replacement line connection part 65 Air pressure measurement line connection part 66 Anticoagulant injection part 67 Tube 68 Three-way valve 68a Opening 68b Opening 69 Tube 70 Filter 71 Filter frame A Blood inflow part B Blood return part E Reservoir F Air layer L1 Dialysate line L2 Filtrate line L3 Fluid replacement line

Claims (6)

In a chamber in an extracorporeal circuit for fluid such as blood,
A chamber body in which a reservoir for blood or the like is formed below and an air layer is formed above;
An outlet for a liquid such as blood provided at the bottom of the chamber body;
A filter disposed in the center of the chamber body, extending in a cylindrical shape along the vertical direction of the chamber body, and a lower end thereof communicating with the outlet,
On the outer periphery of the filter at the bottom of the chamber body, an inlet for a liquid such as blood provided so as to open in a direction along the circumferential direction of the chamber body;
An extracorporeal circulation circuit chamber comprising an air pressure measurement line connected to an upper portion of the chamber main body so as to communicate with the air layer.   The chamber for an extracorporeal circuit according to claim 1, wherein an inclined surface that spirally rises along the outer periphery of the filter from the inlet is provided at the bottom of the chamber body.   The guide surface which inclines diagonally downward toward the center of the outflow port provided in the bottom part of the said chamber main body is formed in the inner peripheral part along the said filter outer periphery of the said inclined surface. Chamber for extracorporeal circuit.   The chamber for an extracorporeal circuit according to any one of claims 1 to 3, wherein the chamber body has a cylindrical shape, and the filter also has a cylindrical shape.   The anticoagulant injection part arrange | positioned so that an anticoagulant may flow down the inner peripheral surface of the said surrounding wall may be provided in the upper part of the said chamber main body. Chamber for extracorporeal circulation circuit. The chamber body has a cylindrical peripheral wall, a lower cap attached to the lower opening of the peripheral wall, and an upper cap attached to the upper opening of the peripheral wall,
The lower cap is connected to an inlet pipe portion to which a liquid inflow line such as blood is connected; the inlet port communicating with the inlet pipe portion; and an outlet pipe portion to which an outflow line of fluid such as blood is connected; The outflow port communicating with the outlet pipe portion is provided,
The upper cap is provided with the air pressure measurement line connecting part, an anticoagulant injecting part, and a support part of the filter,
The extracorporeal circuit according to any one of claims 1 to 5, wherein a lower end portion of the filter is supported by a lead-out pipe portion of the lower cap, and an upper end portion thereof is supported by a support portion of the upper cap. Chamber.