JP2012011076A - Temperature sensor mounting structure for hemocatharsis system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a sensor for detecting the temperature of a fluid flowing in a liquid circuit of a hemocatharsis system, to the liquid circuit with a simple operation.SOLUTION: A deaeration chamber 32 separating bubbles generated in a dialysate in the hemocatharsis system includes a sensor storage part 48 of bottomed cylinder shape extending into the chamber from the outer wall surface of the chamber. The deaeration chamber 32 is fixed into a predetermined position of an apparatus body 36 storing devices of the system. A sensor support mechanism for supporting a rod-shaped temperature sensor 34 turnably is provided in this fixed position. When mounting the deaeration chamber 32 to the apparatus body, the temperature sensor 34 is inserted into the sensor storage part 48. Mounting of the deaeration chamber 32 and attachment of the temperature sensor 34 are performed by a series of work. Since the temperature sensor 34 is turnably supported, unnatural force is not applied to the temperature sensor 34.

Description

  The present invention relates to a system for taking blood out of the body and purifying it, such as hemodialysis, and in particular, to a mounting structure for temperature sensors such as blood flowing through a liquid circuit of the system and dialysate.

  A treatment method is known in which blood is once taken out of a patient's body, subjected to a predetermined treatment, and then returned to the body. For example, in hemodialysis, the extracted blood and dialysate are supplied to a dialyzer, where the waste in the blood is transferred to the dialysate through the semipermeable membrane, and then the purified blood is returned to the body. In apheresis therapy, pathogenic substances in the extracted blood are removed by a treatment such as adsorption and filtration, and then the purified blood is returned to the body.

  In addition, blood or dialysate is warmed so that the temperature of blood returned to the body does not drop. In order to maintain this temperature appropriately, a temperature sensor is used. Since the circuit through which blood, dialysate and the like flow is exchanged for each treatment, the temperature sensor must be detached from the circuit through which the dialysate flows and the like each time. Patent Document 1 listed below discloses a temperature measuring device that is attached to and detached from a circulating body fluid circuit.

Japanese Patent Publication No. 63-16144

  As described above, the temperature sensor attached to the liquid circuit of the blood purification system is detached for each treatment. Therefore, it is desirable that the temperature sensor can be easily attached and detached.

  An object of this invention is to provide the attachment structure of the temperature sensor which can be easily attached or detached with respect to the circuit for liquids of the blood purification system.

  The blood purification system according to the present invention has a device main body equipped with at least a part of equipment constituting the system, and is a part of a liquid circuit of the blood purification system at a predetermined position on the outer surface of the device main body. The chamber in which the liquid flowing through the liquid circuit temporarily stays is fixed. The blood purification system has a temperature sensor that detects the temperature of the liquid flowing through the liquid circuit. The temperature sensor has a rod shape, and the chamber is provided with a sensor accommodating portion for receiving and accommodating the temperature sensor. The temperature sensor is supported by the sensor support mechanism in a tiltable state at the chamber fixing position of the apparatus main body.

  When the chamber is fixed to the chamber fixing position of the apparatus main body, the position of the bottomed cylindrical portion is aligned with the temperature sensor, the chamber is moved so that the temperature sensor is inserted into the bottomed cylindrical portion, and is attached to the fixing position.

  The sensor support mechanism that supports the temperature sensor can support the temperature sensor via a flexible member. Further, the temperature sensor can be supported so as to be rotatable around one axis. Furthermore, the temperature sensor can be supported via a spherical joint.

  Further, the chamber can be held by being sandwiched between two holding pieces fixed to the apparatus main body and at least one of which has elasticity.

  The chamber and the temperature sensor can be attached and detached in a series of operations, which simplifies the operation. Further, since the temperature sensor is supported to be tiltable, it is possible to prevent an excessive force from being applied to the temperature sensor when the chamber is attached and detached. For this reason, damage to the temperature sensor can be prevented.

It is a figure which shows schematic structure of a hemodialysis system. It is a perspective view which shows the external appearance of the deaeration chamber of the state with which the apparatus main body was mounted | worn, and a temperature sensor support mechanism. It is sectional drawing of a deaeration chamber and a temperature sensor. It is explanatory drawing of the removal | desorption operation of the deaeration chamber shown to FIG. It is a fragmentary sectional view which shows another deaeration chamber and a temperature sensor support mechanism. It is explanatory drawing of the desorption operation of the deaeration chamber shown in FIG. It is a perspective view which shows the support mechanism of another deaeration chamber and a temperature sensor. It is explanatory drawing of attachment / detachment operation of the deaeration chamber shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a hemodialysis system 10 as an example of a blood purification system according to the present invention. The flow indicated by the solid arrow is the blood flow, and the flow indicated by the broken arrow is the dialysate flow. The blood taken out from the patient P is sent to the dialyzer 14 by the blood pump 12, passes through the dialyzer 14, and then returns to the patient's body. The blood circuit is provided with a pressure sensor 16 for detecting the pressure at a predetermined location. In the system shown in the figure, pressure is applied to three places in the middle of the pipe that is taken out from the patient P and flows to the blood pump 12, in the middle of the pipe from the blood pump 12 to the dialyzer 14, and in the middle of the pipe that returns blood from the dialyzer 14 to the patient P. A pressure sensor is disposed on the sensor 16. Further, a syringe 18 for injecting a predetermined drug solution into the blood can be connected between the blood pump 12 and the dialyzer 14 as necessary.

  The dialysate reaches the waste liquid bag 22 from the dialysate bag 20 through the dialyzer 14. In the dialysate circuit, a dialysate pump 24 that sends dialysate to the dialyzer 14 and a water removal pump 26 that sends dialysate from the dialyzer 14 to the waste solution bag 22 are disposed. A pressure sensor 28 is disposed between the dialyzer 14 and the water removal pump 26. The piping sent from the dialysate bag 20 to the dialyzer 14 is provided with a dialysate heater 30 that warms the dialysate so that the dialysate does not cool the blood. A deaeration chamber 32 is provided downstream of the dialysate heater 30, and the dialysate is temporarily stored to separate bubbles generated by heating so that only the liquid portion is sent to the dialyzer 14. A temperature sensor 34 is attached to the deaeration chamber 32 to provide feedback for heating by the dialysate heater 30.

  2 is a perspective view showing the appearance of the deaeration chamber 32, and FIG. 3 is a cross-sectional view. The deaeration chamber 32 shown in the figure is a side surface of the apparatus main body 36 that accommodates some devices of the hemodialysis system such as the blood pump 12, dialysate pump 24, dewatering pump 26, dialysate heater 30, power supply and control device. It is attached to. In the drawing, only a part of the apparatus main body 36 is shown. The deaeration chamber 32 has a substantially cylindrical shape, and is mounted on the side surface of the apparatus main body 36 so that the axis of the cylinder is up and down. In the upper part of the deaeration chamber 32, a dialysate inlet 38 that receives the dialysate that has passed through the dialysate heater 30 and a dialysate outlet 40 through which the dialysate flows toward the dialysate pump 24 are provided. An outlet extension tube 42 extends from the dialysate outlet 40 toward the bottom of the deaeration chamber 32. The dialysate flowing in from the dialysate inlet 38 accumulates in the deaeration chamber 32, and bubbles generated in the dialysate accumulate in the upper part of the deaeration chamber. The dialysate accumulates in the lower part, and the outlet extension pipe 42 extends to the dialysate accumulated in the lower part, from which the dialysate flows out.

  A holding clip 44 is provided on a side surface of the apparatus main body 36, and the deaeration chamber 32 is held by the holding clip 44. The holding clip 44 has two holding pieces 46 that extend substantially perpendicular to the side surface of the apparatus main body and sandwich the side surface of the deaeration chamber 32. The holding piece 46 has elasticity, and has a part along the side shape of the deaeration chamber 32 in part. For example, when the deaeration chamber 32 has a cylindrical shape, the holding piece 46 has an arc-shaped portion, the arc-shaped portion is brought into contact with the deaeration chamber 32, and the deaeration chamber 32 is caused by the elasticity of the holding piece. Pinch. Only one of the holding pieces 46 may be elastic.

  The deaeration chamber 32 has a sensor housing portion 48 for housing the temperature sensor 34 at the bottom thereof. The sensor accommodating portion 48 has a bottomed cylindrical shape extending from the bottom surface of the deaeration chamber 32 to the inside of the deaeration chamber 32, and a rod-shaped temperature sensor fits in this. By configuring the sensor housing portion 48 as described above, the liquid temperature in the chamber can be accurately measured. The temperature sensor 34 is supported by a sensor support mechanism 50 fixed to the side surface of the apparatus main body 36. The sensor support mechanism 50 has a fixed portion 54 that is fixed to the side surface of the apparatus main body and supports the rotation shaft 52, and a rotation portion 56 that is rotatably supported by the rotation shaft 52. The rotating portion 56 holds the temperature sensor 34 so that the temperature sensor 34 protrudes upward from the upper surface of the rotating portion.

  FIG. 4 is an explanatory diagram of a process of attaching the deaeration chamber 32 to the apparatus main body 36 and a process of attaching the temperature sensor 34 to the deaeration chamber 32. In order to attach the deaeration chamber 32 to the apparatus main body 36, first, the sensor accommodating portion 48 provided at the bottom of the deaeration chamber is aligned with the tip of the temperature sensor 34. At this time, the deaeration chamber 32 is arranged obliquely so as not to interfere with the holding clip 44. The axial directions of the cylindrical sensor housing 48 and the rod-shaped temperature sensor 34 are aligned, and the deaeration chamber 32 is moved in the direction of arrow A in FIG. 34 is inserted. At this time, the temperature sensor 34 rotates around the center line (axis) of the rotation shaft 52 because the rotation portion 56 that holds the temperature sensor 34 is supported so as to be rotatable in the direction of arrow B in FIG. And can tilt. As a result, in the process of inserting the temperature sensor 34 into the deaeration chamber 32, a moment that acts to bend the temperature sensor 34 is released so that no load is applied to the temperature sensor itself.

  After the temperature sensor 34 is inserted to the base, the deaeration chamber 32 is rotated from the oblique position shown in FIG. 4 toward the holding clip 44 so as to be raised, and between the two holding pieces 46 of the holding clip 44. Push in. The two holding pieces 46 are bent and spread to each other, and when the deaeration chamber 32 is pushed to a position corresponding to the arc portion of the holding piece, it is closed again and the deaeration chamber 32 is sandwiched. The removal of the deaeration chamber 32 is performed by an operation reverse to the mounting. Even during the removal process, the temperature sensor 34 tilts to reduce the load on the temperature sensor and prevent the temperature sensor from being damaged.

  As described above, since the attachment of the deaeration chamber 32 to the apparatus main body 36 and the attachment of the temperature sensor 34 to the deaeration chamber 32 can be performed in a series of operations, workability is improved. Further, since the temperature sensor 34 is supported so as to be tiltable, damage is prevented by preventing a load from being applied to the temperature sensor 34. Further, not only the deaeration chamber 32 but also another chamber-like member can be provided with an accommodating portion capable of accommodating a rod-shaped sensor.

  Further, although the sensor support mechanism 50 is provided so as to protrude from the side surface of the apparatus main body 36, it may be provided on a surface facing the upper side of the apparatus main body 36. In this case, a structure for supporting the rotating shaft may be provided in the apparatus main body 36 instead of protruding the fixed portion 54 from the surface. Moreover, although the temperature sensor 34 is arranged to extend upward, it may be directed to the side. In this case, the deaeration chamber has a sensor accommodating portion on the side surface of the chamber as in the configuration example shown in FIGS.

  5 and 6 are diagrams showing another configuration example of the sensor support mechanism. The sensor support mechanism 58 is a spherical joint provided on the side surface of the apparatus main body 36. The spherical joint includes a receiving portion 60 formed in the apparatus main body 36 and a sphere 62 supported on the inner surface of the receiving portion 60. The receiving portion 60 holds the sphere 62 so that the sphere 62 allows rotation at that position but cannot move. The spherical body 62 has a through-hole (not shown) penetrating through the center thereof, and a rod-shaped temperature sensor 34 and a cable extending therefrom pass through the spherical body 62 through the through-hole. The temperature sensor 34 protrudes laterally from the side surface of the apparatus main body 36, and the direction of the tip can be freely changed up and down and left and right by the function of the spherical joint. For the arrangement of the temperature sensor 34, the deaeration chamber 64 is provided with a sensor accommodating portion 66 extending from the side surface of the cylinder toward the inside of the chamber. Similarly to the sensor housing portion 48 described above, the sensor housing portion 66 also has a bottomed cylindrical shape, and fits snugly when the rod-shaped temperature sensor 34 is inserted. Since the configuration of the deaeration chamber 64 other than the sensor housing portion 66 is the same as that of the deaeration chamber 32 described above, the description thereof is omitted.

  When the deaeration chamber 64 is attached to the apparatus main body 36, the tip of the temperature sensor 34 is aligned with the opening of the sensor housing portion 66, and the rod-shaped temperature sensor 34 and the cylindrical sensor housing portion 66 are mutually connected. With the axes aligned, the deaeration chamber 62 is pushed toward the apparatus main body 36 along the direction of arrow C in FIG. At this time, the temperature sensor 34 supported by the spherical joint can be tilted with two degrees of freedom, up, down, left, and right, and the bending applied to the temperature sensor 34 in the process of inserting the temperature sensor 34 into the deaeration chamber 62. The moment is missing. The same applies to the removal.

  Although omitted in FIGS. 5 and 6, means for holding the deaeration chamber 62 is provided at a predetermined position of the apparatus main body 36. This means can be, for example, the holding clip 44 described above.

  The sensor support mechanism 58 is provided on the side surface of the apparatus main body 36, but may be provided on a surface facing the upper side of the apparatus main body 36, or a shelf-like portion provided so as to protrude from the side surface of the apparatus main body. You may arrange | position on the upper surface of. In this case, the temperature sensor is arranged so as to extend upward, and the sensor accommodating portion of the deaeration chamber is arranged on the bottom surface of the cylinder as in the example shown in FIGS.

  7 and 8 are diagrams showing still another configuration example of the sensor support mechanism. The sensor support mechanism 68 is provided on the upper surface of the apparatus main body 36 and has a flexible support member 70. The support member 70 may be an elastic member, for example, rubber. The support member 70 has a through-hole inside, and the temperature sensor 34 and its cable 72 pass through the through-hole. The support member 70 has, for example, a circular tube shape, and the internal through hole can be a stepped hole including two portions having different diameters. The temperature sensor 34 is inserted and held in a portion with a small diameter of the through-hole, and a cable 72 is accommodated with a gap in the portion with a large diameter. A groove is formed in the outer periphery of the pipe at a position far from the diameter of the through hole, particularly a portion having a small diameter, and a panel constituting the surface of the apparatus main body 36 is fitted into the groove, and the support member 70 is fixed. Since the support member 70 is flexible, the temperature sensor 34 is supported to be tiltable with two degrees of freedom in the front-rear direction and the left-right direction. The deaeration chamber has the same configuration as the deaeration chamber 32 described above, and a description thereof will be omitted.

  When the deaeration chamber 32 is attached to the apparatus main body 36, the position of the tip of the temperature sensor 34 is aligned with the opening of the sensor accommodation part 48 of the deaeration chamber 32, and the cylindrical sensor accommodation part 48 and the rod-shaped sensor 34 are aligned. With the axes aligned, the deaeration chamber 32 is pushed toward the apparatus main body 36 along the direction of arrow E in FIG. At this time, the temperature sensor 34 supported by the flexible support member 70 can be tilted with two degrees of freedom, front, rear, left, and right. In the process of inserting the temperature sensor 34 into the deaeration chamber 32, the temperature sensor 34. The bending moment applied to is released. The same applies when the deaeration chamber 32 is removed.

  The sensor support mechanism 68 has been described as being provided on the upper surface of the apparatus main body 36, but may be provided on another surface facing upward. For example, a shelf-like portion protruding from the side surface may be provided on the side surface of the apparatus main body, and the sensor support mechanism 68 may be provided on the upper surface of this portion. Further, a stepped portion may be provided in the apparatus main body 36, and the sensor support mechanism 68 may be provided on a surface corresponding to the stepped surface. 5 and 6, a sensor support mechanism 68 may be provided on the side surface of the apparatus main body 36 so that the temperature sensor extends laterally. In this case, the sensor accommodating portion of the deaeration chamber is disposed on the side surface of the cylinder as in the examples of FIGS.

  In the above, embodiment of this invention was described using the hemodialysis system. However, the present invention is not limited to a hemodialysis system, and can be applied to other systems such as apheresis therapy, which take blood out of the body, process it, and return it to the body.

  DESCRIPTION OF SYMBOLS 10 Hemodialysis system, 32 Deaeration chamber, 34 Temperature sensor, 36 Apparatus main body, 44 Holding clip, 48,66 Sensor accommodating part, 50,58,68 Sensor support mechanism.

Claims (5)

An apparatus main body equipped with at least a part of equipment constituting the blood purification system;
A chamber that is a part of a circuit for liquid of the blood purification system, in which the liquid temporarily stays and is fixed at a predetermined position on the outer surface of the apparatus body;
A rod-shaped temperature sensor for detecting the temperature of the liquid flowing in the liquid circuit;
A sensor support mechanism for supporting the temperature sensor in a tiltable manner at a chamber fixing position of the apparatus body;
Have
The chamber is provided with a sensor accommodating portion that accommodates a rod-shaped temperature sensor when the chamber is fixed at a fixed position.
Mounting structure of blood purification system temperature sensor.   The temperature sensor mounting structure according to claim 1, wherein the sensor support mechanism supports the temperature sensor via a flexible member.   The temperature sensor mounting structure according to claim 1, wherein the sensor support mechanism supports the temperature sensor so as to be rotatable about one axis.   The temperature sensor mounting structure according to claim 1, wherein the sensor support mechanism supports the temperature sensor via a spherical joint.   The temperature sensor mounting structure according to any one of claims 1 to 4, wherein the chamber is sandwiched and held between two holding pieces that are fixed to the apparatus main body and at least one of which is elastic. Temperature sensor mounting structure.

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