JP6620002B2 - Fluid concentration measuring device and bubble detecting device - Google Patents

Description

  The present invention relates to a fluid concentration measuring device that measures the concentration of a fluid that flows through a deformable conduit that is light transmissive, and a bubble detector that detects bubbles in the fluid flowing through a deformable conduit.

  As a conventional fluid concentration measuring device, for example, the one described in Patent Document 1 is known, and the measuring method and measuring device here measure the concentration of a processing liquid as a fluid for cleaning a semiconductor wafer, A plurality of measuring bodies are provided in the middle of the processing liquid supply pipe, and a light transmitting part in which the optical path length of the light passing through the processing liquid is different is provided in each measuring body, and the optical path length corresponding to the properties of the processing liquid is provided. The light from the light source is supplied to the light transmission part, the light transmitted through the processing liquid in the light transmission part is received by the photodetector, the intensity of the light is examined, and the Lambert-Beer law is determined from the intensity of the light. Based on this, the concentration of the treatment liquid is obtained.

  However, if the conventional device is applied to measure the concentration of a fluid such as blood or a chemical solution flowing in a light-transmitting conduit such as a resin tube or a glass tube, light is transmitted to the optical path crossing the light-transmitting conduit. Although it is necessary to pass through, it is difficult to actually measure the inner diameter of the pipe and the wall thickness of the pipe as the optical path length, and in particular, in the case of a resin tube that can deform the pipe, the inner diameter may change due to the deformation. Therefore, it is extremely difficult to measure the concentration of blood, chemicals, etc. in such a case, and it has been practically impossible to measure the concentration.

  For this reason, as shown in FIG. 1A of Patent Document 2, the inventor of the present application includes a groove extending in the left-right direction in the upper part of the case, and compressively deforms in the diameter direction with a resin tube interposed therebetween. In this way, two pairs of light emitting / receiving units, which are a pair of a light emitting unit and a light receiving unit fixed so as to face the side wall of the groove of the case, are provided so that the optical path distances are different from each other, and light at the light receiving point at each optical path distance Has proposed a fluid concentration measuring device for obtaining the concentration in a resin tube based on the Lambert-Beer law from the strength of the above.

Japanese Patent Laid-Open No. 10-325797 International Publication No. 2014/170985 Pamphlet

  In this fluid concentration measuring device, it is important to ensure that the light-emitting unit and the light-receiving unit are in close contact with the resin tube for accurate concentration measurement. For this reason, a constriction is formed in advance between the light-emitting unit and the light-receiving unit. Then, the resin tube is pushed into the constricted portion and attached, but at this time, the resin tube is distorted and twisted, which deforms the resin tube over time, resulting in variations in measurement results. There is a fear. Furthermore, since it is necessary to install the resin tube in a narrower groove than this, it has been found that there is still room for improvement because it takes time for installation. The same applies to the case where the measurement is finished and the resin tube is removed from the apparatus, and the resin tube is caught in the constricted portion of the groove, and if it is forcibly pulled, the resin tube may be stretched, which requires care. In addition, such a problem occurs in an apparatus that detects the presence or absence of bubbles by transmitting ultrasonic waves to the surface of a deformable pipe and detecting the difference in transmittance based on the difference in transmittance between liquid and bubbles. Can occur as well.

The present invention advantageously solves the above problems, and the fluid concentration measuring device of the present invention is a fluid concentration measuring device for measuring the concentration of a fluid flowing in a light-transmissive and deformable pipe,
A housing formed with an upwardly opening groove to which the conduit is mounted;
A light-emitting unit disposed on one side of the groove and supplying light onto the surface of the conduit;
A light receiving portion that is disposed opposite to the light emitting portion on the other side surface side of the groove and receives light transmitted through the conduit;
A lid that is openably and closably connected to the housing via a hinge and closes the upper opening of the groove in a closed position;
A pressing member that is held in the casing so as to be movable up and down, and is pushed down by the lid in accordance with the closing operation of the lid;
An operation member that holds the light emitting unit or the light receiving unit and moves the light emitting unit and the light receiving unit facing each other by operating in conjunction with the pressing of the pressing member;
And a stopper member that regulates the operation of the operation member and holds the light emitting unit and the light receiving unit at a predetermined interval.

The bubble detection device of the present invention is a bubble detection device that detects the presence or absence of bubbles in a fluid flowing in a deformable pipe,
A housing formed with an upwardly opening groove to which the conduit is mounted;
A transmitter that is disposed on one side of the groove and transmits ultrasonic waves on the surface of the pipe;
A receiving unit that is disposed opposite to the transmitting unit on the other side surface of the groove and receives the ultrasonic wave transmitted through the conduit;
A lid that is openably and closably connected to the housing via a hinge and closes the upper opening of the groove in a closed position;
A pressing member that is held in the casing so as to be movable up and down, and is pushed down by the lid in accordance with the closing operation of the lid;
An operating member that holds the transmitting unit or the receiving unit and moves the opposing transmitting unit and the receiving unit closer to each other by operating in conjunction with the pressing of the pressing member;
And a stopper member that regulates the operation of the operating member and holds the transmitter and the receiver at a predetermined interval.

  In such a fluid concentration measuring device of the present invention, when the light-transmitting and deformable conduit is mounted in the groove formed in the housing, the light emitting unit or the light receiving unit is in a state where the lid is opened. The actuating member that holds can be moved in a direction that separates the distance between the light emitting unit and the light receiving unit. When the conduit is installed in the groove of the housing and the lid is closed, the actuating member brings the light emitting portion and the light receiving portion closer together in conjunction with the pressing of the pressing member accompanying the closing operation of the lid. Both parts are pressed against the pipeline. At this time, the operation of the operating member is regulated by the stopper member, and the light emitting unit and the light receiving unit are held at a predetermined interval.

  Therefore, according to the fluid concentration measuring device of the present invention, when the lid is opened, the groove width of the portion that becomes the narrowed portion at the time of measurement can be temporarily widened so that the pipe line can be easily installed in the groove. Or it can be removed from the groove. In addition, when the measurement is performed, the actuating member interlocks with the closing operation of the lid to bring the light-emitting part and the light-receiving part closer together, so that both the light-emitting part and the light-receiving part can be reliably brought into pressure contact with the pipe line and actuated by the stopper member. By restricting the operation of the member, a constant optical path distance is always provided between the light emitting unit and the light receiving unit, and distortion and twisting that occur in the conventional pipeline are effectively prevented, and the pipeline generated over time is prevented. Since deformation can be effectively prevented, accurate measurement can be performed.

  The fluid concentration measuring device according to the present invention may include two sets of the groove and the actuating member, and a transmission member that simultaneously operates the two actuating members in conjunction with the depression of the push-down member. By doing so, for example, concentration measurement before and after hemodialysis in hemodialysis therapy can be performed with a single concentration measuring device.

  Moreover, in the fluid concentration measuring apparatus of this invention, you may provide the elastic member interposed between the said press member and the said operation member, and according to this, a some dimension is provided in a press member or an operation member. Even if there is an error, the elastic member can absorb the error, and the light emitting portion and the light receiving portion can be reliably brought into pressure contact with the conduit even when using conduits having different outer diameters.

  Furthermore, the fluid concentration measuring apparatus of the present invention may further include a biasing member that biases the operating member directly or indirectly in a direction in which the light emitting unit and the light receiving unit are separated from each other. According to the above, since the narrowed portion of the groove is always expanded in the state in which the lid is opened, it is possible to attach and detach the conduit to and from the groove without any further load.

  Further, according to the bubble detection device of the present invention, in the state where the lid is opened, the groove width of the portion that becomes the narrowed portion at the time of measurement can be temporarily widened so that the pipe line can be mounted in the groove without difficulty. Can be removed from the groove. In addition, when the measurement is performed, the operating member is operated in conjunction with the closing operation of the lid, and the transmitting unit and the receiving unit are brought close to each other, so that both the transmitting unit and the receiving unit can be reliably brought into pressure contact with the pipeline, and the stopper member Due to the restriction of the operation of the operation member by the above, a constant optical path distance is always provided between the transmission part and the reception part, and the presence or absence of bubbles in the fluid in the pipe line can be accurately detected.

1 shows a fluid concentration measuring apparatus according to an embodiment of the present invention, in which (a) is an external perspective view of the front side, and (b) is an external perspective view of the back side in a state where the lid is opened. FIG. 2 is a plan view of the fluid concentration measuring device shown in FIG. 1 in a state where a lid is opened. It is a schematic diagram explaining the component of the light emission part in the fluid concentration measuring apparatus shown in FIG. 1, and a light-receiving part. (A) is sectional drawing which follows the AA line in FIG. 2, (b) is sectional drawing which shows a mode that the cover body was closed from the state of Fig.4 (a). It is a block diagram which shows an example of an electrical configuration of the fluid concentration measuring apparatus shown in FIG. It is the external appearance perspective view in the state which opened the cover body which shows the fluid concentration measuring apparatus of other embodiment according to this invention. (A) is a right side view of the fluid concentration measuring device shown in FIG. 6, and (b) is a bottom view of the fluid concentration measuring device. (A) is sectional drawing which follows the BB line in FIG. 7, (b) is sectional drawing which shows a mode that the cover body was closed from the state of Fig.8 (a). (A) is a longitudinal cross-sectional view of the bubble detection apparatus of one Embodiment according to this invention, (b) is a mode that a resin tube is pinched | interposed between the transmission part of this bubble detection apparatus, and a bubble is detected It is the cross-sectional view which showed typically.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a fluid concentration measuring apparatus 10 according to an embodiment of the present invention. As shown in this figure, the fluid concentration measuring device 10 includes a housing 12 that houses the main part of the device 10, a lid 16 that is connected to the housing 12 via a hinge 14 so as to be openable and closable, Provided in the center of the front surface of the body 16 (on the opposite side of the hinge 14) is provided with a fastener 18 such as a hook for holding the closed posture of the lid body 16 with respect to the housing 12.

  The housing 12 includes a front wall 12a and a rear wall 12b that face each other, a right side wall 12c and a left side wall 12d that are arranged to face each other and connect between the front wall 12a and the rear wall 12b, and an upper side that connects the upper ends of these walls 12a to 12d. And a wall 12e.

  A groove 20 that opens upward is provided at a substantially central position in the front-rear direction of the upper wall 12e of the housing 12 so that a resin tube (resin tube) is installed as a light-transmissive and deformable conduit. The groove 20 extends linearly between the left and right side walls 12c and 12d of the housing 12. The width of the groove 20 is small at both ends in the longitudinal direction, and is slightly enlarged at an intermediate portion between both ends. The groove width at both ends is preferably the same as or slightly larger than the outer diameter of the resin tube attached to the groove 20.

  As shown in FIG. 1B and FIG. 2, the fluid concentration measuring device 10 is disposed so as to face each other in the width direction of the groove 20, and a light emitting unit 22 and a light receiving unit that respectively form part of the side wall of the groove 20. 24.

  Details of the light emitting unit 22 and the light receiving unit 24 are schematically shown in FIG. The light-emitting unit 22 includes a light-emitting element 25 that emits light when supplied with electricity, such as a light-emitting diode (LED) or a laser diode as a light source, and the light from the light-emitting element 25 is positioned on the surface of the resin tube. Supply from the supply point S into the resin tube. In the illustrated example, the light supply locations S are provided at two locations apart in the longitudinal direction (extending direction) of the resin tube, and from one light emitting element 25 to each light supply location S via two optical fibers 26 and 27. And is configured to propagate light. Ball lenses 29 and 30 serving as the light supply locations S are provided at the ends of the optical fibers 26 and 27, respectively, and collimated light that is larger than the core diameter of the optical fibers 26 and 27 is emitted. In the figure, reference numeral 31 denotes an optical fiber fixing plate, reference numeral 32 denotes a light emitting element holding plate, and both members 31 and 32 are fixed to each other via a screw 33. The insertion hole 32 a of the screw 33 of the light emitting element holding plate 32 is formed as a long hole that is long in the juxtaposition direction of the optical fibers 26 and 27. As a result, the position of the light-emitting element holding plate 32 can be adjusted in the juxtaposition direction with respect to the optical fiber fixing plate 31, and the optical intensities of the two optical fibers 26 and 27 are matched to each other, so Can be.

  The light receiving unit 24 includes a light receiving element that receives light and generates electricity, such as a photodiode or a phototransistor. The light receiving unit 24 receives light supplied from the light emitting unit 22 and transmitted through the resin tube, and receives the light. An electric signal corresponding to the strength is output. In the illustrated example, as the light receiving elements, a large number of light receiving elements that are located on the opposite side of the diameter direction of the resin tube with respect to the light supply location S and that are continuously arranged linearly at equal intervals in the extending direction of the resin tube. A line sensor 35 having 35a is used. The line sensor 35 may include a large number of charge-coupled devices (CCDs), for example, that sequentially output the signals of the light receiving elements 35a and sequentially output them. The many light receiving elements 35a of the line sensor 35 are adjusted to the same sensitivity in advance. The light transmitted through the resin tube is collimated (condensed) by the ball lenses 36 and 37 serving as the light receiving points R, and the line sensor 35 receives the light. In this example, the distances (optical path lengths) L and l from the two light supply locations S to the opposite light receiving locations R are set to be different from each other, but the two optical path lengths L and l are the same. It may be set. The light emitting unit 22 and the light receiving unit 24 emit and receive light having a wavelength near 590 nm, for example, as light having substantially the same absorption rate for both oxygenated hemoglobin of arterial blood and deoxygenated hemoglobin of venous blood. It may be.

  Next, the holding structure of the light emitting unit 22 and the light receiving unit 24 will be described. As shown in FIG. 4A, the fluid concentration measuring device 10 includes a swinging member 38 that holds the light emitting unit 22 as an operating member. Yes. The swing member 38 has a substantially L-shape in which the two leg portions 38a and 38b are integrally connected to each other at the base end when viewed in a longitudinal section along the front-rear direction (FIG. 4A). Via the part 39, it is supported by the housing | casing 12 so that it can rock | fluctuate around the axis line along the extension direction of resin tube TB. Concave portions 41 and 42 for receiving coil springs, which will be described later, are formed on both upper and lower surfaces at the end of one leg portion 38a extending substantially in the horizontal direction. The end portions of the optical fibers 26 and 27 of the light emitting portion 22 are inserted and supported on the other leg portion 38b extending substantially vertically. The wall portion exposing the ball lenses 29 and 30 provided at the ends of the optical fibers 26 and 27 at the upper portion of the leg portion 38b constitutes a part of the side wall portion of the groove 20. The wall portion is formed as an inclined surface that changes the groove width along the longitudinal direction of the groove 20 (see FIG. 3), and the two ball lenses 29 and 30 in the light emitting portion 22 are disposed in the inclined surface. ing. Accordingly, two optical paths L and l having different lengths are formed between the ball lenses 29 and 30 of the light emitting unit 22 and the ball lenses 36 and 37 of the light receiving unit 24. The optical fiber fixing plate 31 and the light emitting element holding plate 32 described above are attached to the lower portion (lower surface) of the leg portion 38b extending in the substantially vertical direction. And swings around the shaft 39.

On the other hand, the line sensor 35 in the light receiving unit 24 is held in a sensor holding member 44 having a substantially U-shaped cross section. The hanging wall 44 a of the sensor holding member 44 constitutes a part of the side wall portion of the groove 20. As shown in FIG. 3, the vertical wall 44a is formed with _two passages (through holes) 44a ₁ and 44a ₂ that allow the light transmitted through the resin tube to pass toward the line sensor (see FIG. 3). The ball lenses 36 and 37 are fixed to the start ends of the passages 44a ₁ and 44a ₂ .

  As shown in FIGS. 4A and 4B, the swing member 38 is held on the upper wall 12 e of the housing 12 between the groove 20 and the hinge 14 so as to be movable up and down, and the head portion of the swinging member 38 is the housing 12. It is swung by a pressing member 46 that protrudes from the upper wall 12e and is pressed by the lid 16. A coil spring 47 as an elastic member is interposed between the pressing member 46 and the swing member 38 and is seated in the concave portion 41 provided on the upper surface of the leg portion 38 a extending substantially horizontally of the swing member 38. The pressing force from the pressing member 46 is transmitted to the swinging member 38 via the coil spring 47, and the swinging member 38 swings clockwise in FIG.

  The swing angle of the swing member 38 is regulated by a stopper member 48 provided between the sensor holding member 44 and the swing member 38. The stopper member 48 keeps the distance between the swinging member 38 and the sensor holding member 44 in the groove 20, and thus the distance between the light supply location S and the light reception location R constant, and the light supply location S and the light reception location. It has a function of positioning the rocking member 38 in a state where R is aligned (the optical axis is coincident).

  Further, in the fluid concentration measuring apparatus 10 of this embodiment, the swinging member 38 is pressed between the concave portion 42 formed on the lower surface of the substantially horizontal leg 38 a of the swinging member 38 and the housing 12. Another coil spring 49 is provided that swings in a direction opposite to the swinging direction when 46 is pressed (counterclockwise in FIG. 4A). This coil spring 49 urges the swinging member 38 upward in a direction in which the swinging member 38 and the sensor holding member 44 are separated from each other in the groove 20, and provides sufficient space for the resin tube to be attached to and detached from the groove 20. Functions as a biasing member.

  In the fluid concentration measuring apparatus 10 having such a configuration example, as shown in FIG. 4A, when the lid 16 is opened, the swing member 38 as the operating member is replaced with the light supply location in the groove 20. S (in this example, the ball lenses 29 and 30 of the light emitting unit 22) and the light receiving portion R (in this example, the ball lenses 36 and 37 of the light receiving unit 24) are swung in a direction to separate the resin tube TB. 20 can be easily inserted. In particular, when the coil spring 49 is provided as a biasing member that biases the swing member 38 in a direction in which the light supply point S and the light receiving point R in the groove 20 are separated from each other, the lid 16 is opened. In this state, the narrowed portion of the groove 20 (the gap between the light supply point S and the light receiving point R) is always widened, so that the resin tube TB can be attached to and detached from the groove 20 without much load. Become.

  Then, as shown in FIG. 4B, when the resin tube TB is mounted in the groove 20 of the housing 12 and the lid body 16 is closed, the elastic force is interlocked with the depression of the pressing member 46 accompanying the closing operation of the lid body 16. The coil spring 47 as a member is compressed, and the coil spring 47 swings the swinging member 38 in a direction in which the light supply point S and the light receiving point R in the groove 20 approach each other. The light receiving portion R of the light receiving unit 24 is pressed against the surface of the resin tube TB. At this time, the swinging of the swinging member 38 is regulated by the stopper member 48, and the space between the light supply point S and the light receiving point R on the surface of the resin tube TB is always maintained at a constant interval.

  Therefore, according to this fluid concentration measuring apparatus 10, in the state where the lid 16 is opened, the groove width (distance between the light supply point R and the light receiving point S) of the portion that becomes the narrowed portion at the time of measurement is temporarily set. Thus, the resin tube TB can be mounted or removed from the groove 20 without difficulty. On the other hand, at the time of measurement, the swinging member 38 swings in conjunction with the closing operation of the lid body 16, and the light supply point R of the light emitting unit 22 and the light receiving point R of the light receiving unit 24 come close to each other. In addition, both the light receiving portion R and the light receiving portion R can be surely brought into pressure contact with the resin tube TB, and a constant optical path length is always provided between the light supply portion S and the light receiving portion R by restricting the swinging member 38 by the stopper member 48. It is possible to accurately measure the concentration because it can effectively prevent distortion and torsion that occur in the conventional resin tube and effectively prevent the deformation of the pipe line that occurs over time. Become.

  Furthermore, in the fluid concentration measuring apparatus 10 of this embodiment, since the pressing member 46 is disposed close to the hinge 14 between the hinge 14 and the groove 20, a large moment arm having the pressing member 46 as an action point is provided. Therefore, the pressing member 46 can be pushed down by the lid 16 and the swinging member 38 can be swung with a smaller force. Similarly, since the pressing force from the pressing member 46 is received by the end portion (concave portion 41) of the leg portion 38a of the swinging member 38 away from the shaft portion 39, the force is applied to the shaft portion 39 as a fulcrum. A large moment arm can be secured between the end portion and the pressing member 46 can be pushed down by the lid body 16 and the swinging member 38 can be swung with a smaller force.

  FIG. 5 is a block diagram collectively showing an example of the electrical configuration of the fluid concentration measuring apparatus 10 of the above embodiment. In the apparatus shown in FIGS. 1 to 4, light emitted from the light emitting element 25 driven by the light emitting element driver is transmitted with the same light intensity through the two optical fibers 26 and 27, and the resin tube TB The tube wall on the side close to the light emitting part 22, the blood BT flowing inside the resin tube TB, and the tube wall far from the light emitting part (opposite side), that is, on the side close to the light receiving part 24, are fixed differently. The light is received by a plurality of light receiving elements 35a of the line sensor 35 through optical paths of distances L and l. The line sensor 35 has, for example, 128 light receiving elements 35a with a pitch of 8 μm, and these light receiving elements 35a are adjusted in advance so that the light receiving intensities are equal to each other, and an electric signal having a level corresponding to the intensity of the received light. The CCD (Charge Coupled Device) arranges these electrical signals over time and outputs them as analog signals.

  In this example, the light emitting element driver causes the light emitting element 25 to emit light, and the line sensor driver reads from the line sensor 35 analog signals lined up over time of a large number of light emitting elements 35a and outputs analog signals as analog data. D), and A / D converts the analog data into digital data and outputs it to a central processing unit (CPU) as fluid concentration output means.

  Based on a program stored in advance in a memory (not shown), the CPU matches the optical axis with the light from the two light emission supply points S among the many light receiving elements 35a of the line sensor 35 from the digital data output by the A / D. The intensity of light received by each of the plurality of light receiving elements 35a at a predetermined position including the two light receiving elements 35a is obtained. For example, the intensity of the received light and the length of the optical path from the light supply point S to the light receiving point R From L and l, based on the Lambert-Beer law, a concentration measurement value is obtained under two kinds of conditions with different optical path lengths. In addition, about the specific calculation method based on the Law of Lambert-Beer, PCT / JP2013 / 54664 international application (WO2014 / 050162 international publication pamphlet) and PCT / JP2013 / 61486 international application which the present applicant applied earlier. It is described in detail in the application (WO2014 / 170985 international publication pamphlet).

  Next, another embodiment of the fluid concentration measuring apparatus according to the present invention will be described with reference to FIGS. The fluid concentration measuring device 50 of this embodiment is different from the fluid concentration measuring device 10 of the previous embodiment in that it includes two sets of measuring units each including a light emitting unit and a light receiving unit.

  As shown in FIGS. 6 and 7, the fluid concentration measuring device 50 includes a housing 52 that houses a main part of the device 50, and a lid 56 that is connected to the housing 52 through a hinge 54 so as to be opened and closed. And a fastening tool 58 such as a hook which is provided on the opposite side of the hinge 54 and holds the closed posture of the lid body 56 with respect to the housing 52.

  The housing 52 includes a front wall 52a and a rear wall 52b that face each other, a right wall 52c and a left wall 52d that are arranged to face each other and connect the front wall 52a and the rear wall 52b, and an upper portion that connects the upper ends of these walls 52a to 52d. And a wall 52e.

  On the upper wall 52e of the housing 52, two grooves 60A and 60B opened upward in which a resin tube (resin tube) as a light-transmissive and deformable conduit is mounted are separated from each other in the front-rear direction. These grooves 60 </ b> A and 60 </ b> B extend linearly between the left and right side walls 52 c and 52 d of the casing 52. The width of each groove 60A, 60B is small at both ends in the longitudinal direction, and is slightly enlarged at the intermediate portion between both ends. The groove width at both ends is preferably the same as or slightly larger than the outer diameter of the resin tube attached to the grooves 60A and 60B.

  As shown in FIG. 8A, the fluid concentration measuring device 50 includes two light emitting portions 62A and 62B and two light receiving portions 64A and 64B, and is disposed facing each other in the width direction of the grooves 60A and 60B. The light emitting unit 62A and the light receiving unit 64A, and the light emitting unit 62B and the light receiving unit 64B make a pair. Note that the configurations of the light emitting units 62A and 62B and the light receiving units 64A and 64B are the same as those of the light emitting unit 22 and the light receiving unit 24 in the apparatus of the previous embodiment. Is also omitted.

  The holding structure of the light emitting parts 62A and 62B and the light receiving parts 64A and 64B will be described. The fluid concentration measuring device 50 includes two swinging members 68A and 68B as operating members for holding the light emitting parts 62A and 62B, respectively. . Each of the swinging members 68A and 68B has a substantially I-shape in which the two leg portions 68Aa, 68Ab, 68Ba, and 68Bb are integrally connected to each other at the base end when viewed in a longitudinal section (FIG. 8A) along the front-rear direction. In the vicinity of the connecting portion, the casing 52 is supported by the casing 52 so as to be swingable about an axis along the extending direction of the resin tube TB via the shaft portions 70A and 70B. Concave portions 72A and 72B for receiving coil springs, which will be described later, are formed at the end portions of the one leg portions 68Aa and 68Ba extending downward from the shaft portions 70A and 70B so that the bottom surfaces thereof face rearward. End portions of two optical fibers (not shown) of the light emitting portions 62A and 62B are inserted and supported above the other leg portions 68Ab and 68Bb extending above the shaft portions 70A and 70B. The wall portions exposing the ball lenses 74A and 74B provided at the ends of the respective optical fibers at the upper portions of the upper leg portions 68Ab and 68Bb constitute a part of the side walls of the grooves 60A and 60B. Optical fiber fixing plates 75A and 75B and light emitting element holding plates 76A and 76B similar to those described in the previous embodiment are attached to the lower portions (lower surfaces) of the upper legs 68Ab and 68Bb, and these optical fiber fixing plates 75A. 75B and the light emitting element holding plates 76A and 76B swing together with the swinging members 68A and 68B.

  On the other hand, the line sensors 78A and 78B in the light receiving portions 64A and 64B are held in sensor holding members 79A and 79B having a substantially U-shaped cross section. The vertical walls of the sensor holding members 79A and 79B constitute part of the side walls of the grooves 60A and 60B. These vertical walls are formed with two passages (through holes) (not shown) that allow the light transmitted through the resin tube TB to pass toward the line sensors 78A and 78B. Ball lenses 80A and 80B are formed at the start ends of the respective passages. Is fixed.

  The swinging members 68A and 68B are held between the grooves 60A and 60B and the hinge 54 so as to be movable up and down on the upper wall 52e of the casing 52, and the head projects from the upper wall 52e of the casing 52 by the lid body 56. The pressing member 82 that is pressed down and the transmission member 84 that converts the lowering motion of the pressing member 82 into a horizontal motion and simultaneously transmits the horizontal motion to the two swinging members 68A and 68B are swung.

  The transmission member 84 is formed in a plate shape as shown in FIG. 7 (b), and as shown in FIG. 7 (a), a guide 85 made up of a roller 85a and a long hole 85b at the lower side of the casing 52 at its side. Is supported so as to be movable in the front-rear direction. The transmission member 84 is formed with window holes 84a and 84b corresponding to the lower leg portions 68Aa and 68Ba of the swinging members 68A and 68B. The recesses 72A and 72B of the leg portions 68Aa and 68Ba and the window holes 84a and 84b are formed. Between the two, coil springs 86A and 86B as elastic members are interposed. Further, as shown in FIG. 8A, the transmission member 84 abuts a roller 82a provided at the lower end of the pressing member 82 at the rear end and converts the descending operation of the pressing member 82 into a horizontal operation. Surface). As a result, when the pressing member 82 is pushed down, the transmission member 84 moves forward (leftward in FIG. 8A) via the cam surface 84c, and the transmission member 84 compresses the two coil springs 86A and 86B simultaneously. The compressed coil springs 86A and 86B cause the swinging members 68A and 68B to swing clockwise in FIG. 8A around the shaft portions 70A and 70B.

  The swing angles of the swing members 68A and 68B are regulated by stopper members 88A and 88B provided between the sensor holding members 79A and 79B and the swing members 68A and 68B, respectively. The stopper members 88A and 88B hold the distance between the swinging members 68A and 68B and the sensor holding members 79A and 79B in the grooves 60A and 60B, and thus the distance between the light supply point S and the light receiving point R constant. The light supply point S and the light receiving point R have a function of positioning the swinging members 68A and 68B in a state where the light receiving points R are aligned (the optical axes are coincident).

  Further, in the fluid concentration measurement device 50 of this embodiment, another coil spring 90 that urges the transmission member 84 rearward is provided between the front end of the transmission member 84 and the lower portion of the housing 52. When the cover 56 is opened, the coil spring 90 moves the transmission member 84 rearward, and the front edge portions of the window holes 84a and 84b of the transmission member 84 are lower leg portions of the swinging members 68A and 68B. 68Aa and 68Ba are pressed backward to swing counterclockwise in FIG. 8A around the shaft portions 70A and 70B. The coil spring 90 indirectly biases the swinging members 68A and 68B in the direction in which the swinging members 68A and 68B and the sensor holding members 79A and 79B are separated in the grooves 60A and 60B. It functions as an urging member that forms a sufficient space for attaching and detaching the resin tube TB.

  In the fluid concentration measuring apparatus 50 having such a configuration example, as shown in FIG. 8A, when the lid 56 is opened, the swinging members 68A and 68B are placed in the light supply locations in the grooves 60A and 60B. By swinging S (ball lenses 74A and 74B of the light emitting portions 62A and 62B in this example) and the light receiving portion R (ball lenses 80A and 80B of the light receiving portions 64A and 64B in this example) in a direction to separate them, The tube TB can be easily inserted into the grooves 60A and 60B. In particular, when the coil spring 90 that urges the swinging members 68A and 68B via the transmission member 84 in the direction in which the light supply point S and the light receiving point R in the grooves 60A and 60B are separated from each other, In the state where the lid 56 is opened, the narrowed portions (gap between the light supply point S and the light receiving point R) of the grooves 60A and 60B are always widened, so that the resin tube TB can be attached to and detached from the grooves 60A and 60B. It becomes possible to carry out without much load.

  Then, as shown in FIG. 8B, when the resin tube TB is mounted in the grooves 60A and 60B of the housing 52 and the lid body 56 is closed, the push-down member 82 is pushed down as the lid body 56 is closed. Thus, the transmission member 84 horizontally moves forward under the guidance of the guide 85, and the two coil springs 86A, 86B disposed in the window holes 84a, 84b of the transmission member 84 are compressed. The two compressed coil springs 86A and 86B cause the swinging members 68A and 68B to swing in the direction in which the light supply point S and the light receiving point R in the grooves 60A and 60B approach each other, and light is emitted in each groove 60A and 60B. The light supply locations S of the portions 62A and 62B and the light receiving locations R of the light receiving portions 64A and 64B are both pressed against the surface of the resin tube TB. At this time, the swinging of the swinging members 68A and 68B is restricted by the stopper members 88A and 88B, and the space between the light supply point S and the light receiving point R on the surface of the resin tube TB is always maintained at a constant interval.

  Therefore, according to the fluid concentration measuring device 50, when the lid 56 is opened, the groove width (gap between the light supply point S and the light receiving point R) of the portion that becomes the narrowed portion at the time of measurement is temporarily set. Thus, the resin tube TB can be mounted in or removed from the grooves 60A and 60B without difficulty. Further, at the time of measurement, the swinging members 68A and 68B swing in conjunction with the closing operation of the lid 56, and the light supply location S of the light emitting portions 62A and 62B and the light receiving location R of the light receiving portions 64A and 64B approach each other. Both the light supply point S and the light receiving point R can be surely brought into pressure contact with the resin tube TB, and the light supply point R and the light receiving point are controlled by restricting the swinging members 68A and 68B by the stopper members 88A and 88B. It is possible to always provide a constant optical path distance between S, and to effectively prevent distortion and torsion that occur in a conventional resin tube and effectively prevent deformation of the pipe that occurs over time. Therefore, accurate concentration measurement is possible. Further, since the fluid concentration measuring device 50 has two measuring units, for example, blood concentration measurement before and after hemodialysis in hemodialysis therapy can be performed by one fluid concentration measuring device.

  Further, in the fluid concentration measuring apparatus 50 of this embodiment, the pressing member 82 is provided close to the hinge 54 between the hinge 54 and the rear groove 60A. Since the arm can be secured, the pressing member 82 can be pushed down by the lid 56 with a smaller force, and the swinging members 68A and 68B can be swung. Similarly, since the pressing force from the transmission member 84 is received by the leg portions 68Aa and 68Ba (recess portions 72A and 72B) of the swinging members 68A and 68B apart from the shaft portions 70A and 70B, A large moment arm can be secured between the shafts 70A and 70B and the pressing points by the coil springs 86A and 86B, which are the power points, and the pressing member 82 is pushed down by the lid 56 with a smaller force, and thus swings. The members 68A and 68B can be swung.

  As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned example, It can change suitably in the description range of a claim. For example, in the devices 10 and 50 according to the above-described embodiments, the swing members 38, 68A, and 68B hold the light-emitting portions 22, 62A, and 62B and the light-emitting portions 22, 62A, and 62B with respect to the light-receiving portions 24, 64A, and 64B. Although the example which makes it approach and separate was shown, it replaces with this, and rocking | fluctuation member 38,68A, 68B hold | maintains the light-receiving part 24,64A, 64B, and light-receiving part 24,64A, 64B is light-emitting part 22,62A, 62B. You may make it approach and separate. Alternatively, two oscillating members are provided in the grooves 20, 60A, 60B so as to face each other, the light emitting units 22, 62A, 62B are held by one oscillating member, and the light receiving unit 24, 64A and 64B may be held, and the light emitting units 22, 62A and 62B and the light receiving units 24, 64A and 64B may be moved close to and away from each other.

  In the devices 10 and 50 of the above embodiment, the coil springs 47, 49, 86A, 86B, and 90 are used as the elastic member and the urging member, respectively. A type of spring or rubber may be used.

  Furthermore, in the apparatus 10 and 50 of the said embodiment, although it provided with the rocking | swiveling member 38, 68A, 68B which can rock | fluctuate around the axis line along the extension direction of the groove | channel 20, 60A, 60B as an operation member, However, the present invention is not limited to this, and a cam mechanism or a link mechanism that transmits the downward movement of the pressing members 46 and 82 and moves the light emitting unit 22 and the light receiving unit 24 closer to or away from each other may be used.

  Furthermore, in the apparatus 10 and 50 of the said embodiment, although the two light supply locations S were provided in each groove | channel 20, 60A, 60B, the light supply location S should just be at least one. Alternatively, light is supplied from three or more light supply locations S, the light is received by the line sensors 35, 78A, 78B, the light intensity is obtained, and the fluid concentration is obtained with higher accuracy from the light intensity. May be. Furthermore, the light supply means to the light supply locations S is not limited to the illustrated example, and the light emitting elements may be directly arranged at the respective light supply locations S.

  Furthermore, in the apparatus 10 and 50 of the said embodiment, although demonstrated using the line sensors 35, 78A, and 78B which have many light receiving elements for light reception, not only this but a single light receiving element in each light receiving position. It may be arranged. In addition, a plurality of line sensors may be arranged in parallel in the extending direction of the pipeline, or a two-dimensional optical sensor having a large number of pixels aligned at least in the extending direction of the pipeline may be substituted. In this case, it is possible to cope with the deviation of the optical axis in the circumferential direction or tangential direction of the pipe.

  Furthermore, in the apparatus of the above embodiment, the concentration of blood as a liquid can be measured, but it can also be used for measuring the concentration of other liquids. In this case, the light supplied from the light source is absorbed by the liquid. It is preferable to select light of a wavelength with a high rate.

  In the apparatus of the above embodiment, the CPU performs a calculation process based on the intensity of the light output from the light receiving element to obtain the blood concentration and outputs it, but instead, a predetermined range of the line sensor is output. For each of the multiple types of fluid concentrations obtained in advance and stored in the memory or the like, the areas of the regions surrounded by the multiple types of distribution patterns of the light intensity output from the light receiving element or the distribution pattern of the predetermined range are stored. In comparison with the shape or area of the distribution pattern, if they do not match, the data concentration may be complemented to obtain the fluid concentration. In this way, the light intensity received by the many light receiving elements is reduced. The concentration of the fluid can be easily obtained and output in time.

  The pressure contact and release of the light emitting part and the light receiving part to the resin tube in conjunction with the opening and closing of the lid described above are not limited to the fluid concentration measuring device, but bubbles in the liquid flowing in the resin tube as a deformable conduit It can also be used for a device that detects (including microbubbles). 9A and 9B show a bubble detection device according to an embodiment of the present invention, in which FIG. 9A is a longitudinal sectional view, and FIG. 9B is a view of the bubble formed by sandwiching a resin tube between the transmission portion and the reception portion of the bubble detection device. It is the cross-sectional view which showed typically a mode that detection was performed. In addition, the same code | symbol is attached | subjected to the element similar to the element in the fluid concentration measuring apparatus of embodiment shown in FIGS. 1-4, and detailed description is abbreviate | omitted.

  The bubble detection device 100 includes a transmission unit 102 that transmits ultrasonic waves to the surface of the resin tube TB in place of the light emitting unit 22 in the fluid concentration measurement device 10 illustrated in FIGS. Instead, a receiving unit 104 that receives the ultrasonic wave transmitted through the resin tube TB is provided. The transmitter 102 is held by a swing member 38 as an operating member. When the resin tube TB is mounted in the groove 20 of the apparatus 100 having such a configuration and the lid body 16 is closed, the pressing member 46 is pushed down by the lid body 16 and the swinging member 38 swings via the coil spring 47 as an elastic member. The resin tube TB is sandwiched between the transmitter 102 and the receiver 104 under a predetermined pressure. Thereby, the ultrasonic wave transmitted from the transmitter 102 can be reliably transmitted to the resin tube TB, and the ultrasonic wave transmitted through the resin tube TB and the fluid therein can be reliably received by the receiver 104. The ultrasonic wave transmitted through the resin tube TB and the fluid inside thereof is received by the receiving unit 104, and a calculation unit (not shown) such as a CPU is based on the ultrasonic wave reception intensity and / or required from the transmission to the reception of the ultrasonic wave. Based on the measured time, the presence or absence of bubbles in the resin tube TB is detected.

  In the bubble detection device of the present invention, as with the fluid concentration measurement device shown in FIGS. 5 to 8, two sets of grooves and swinging members are provided, and two swinging members are interlocked with the depression of the pressing member. It is also possible to provide a transmission member that swings simultaneously. In this case, a biasing member that biases the transmission member and swings the swinging member in a direction in which the transmitting unit and the receiving unit are separated from each other may be provided.

  Thus, according to the fluid concentration measuring device of the present invention, it is easy to attach and detach the conduit to the device, and it is possible to accurately measure the concentration by securely bringing the light emitting portion and the light receiving portion into close contact with the conduit. Is possible. Further, according to the bubble detection device of the present invention, it is easy to attach and detach the pipeline to the device, and accurate bubble detection is performed by reliably bringing the ultrasonic wave transmitting and receiving portions into close contact with the pipeline. It is possible.

DESCRIPTION OF SYMBOLS 10,50 Fluid concentration measuring device 12,52 Case 14,54 Hinge 16,56 Lid 18,58 Fastener 20,60A, 60B Groove 22,62A, 62B Light emitting part 24,64A, 64B Light receiving part 25 Light emitting element 26 27 Optical fiber 29, 30, 74A, 74B Ball lens, light supply location 31, 75A, 75B Optical fiber fixing plate 32, 76A, 76B Light emitting element holding plate 35, 78A, 78B Line sensor 36, 37, 80A, 80B Ball lens, Light receiving point 38, 68A, 68B Oscillating member (actuating member)
39, 70A, 70B Shaft 44, 79A, 79B Sensor holding member 46, 82 Depressing member 47, 86A, 86B Coil spring (elastic member)
48, 88A, 88B Stopper member 49, 90 Coil spring (biasing member)
84 Transmission member 84c Cam surface 85 Guide 100 Bubble detection device 102 Transmitter 104 Receiver

Claims (5)

A fluid concentration measuring device for measuring the concentration of a fluid flowing in a light transmissive and deformable pipe,
A housing formed with an upwardly opening groove to which the conduit is mounted;
A light-emitting unit disposed on one side of the groove and supplying light onto the surface of the conduit;
A light receiving portion that is disposed opposite to the light emitting portion on the other side surface side of the groove and receives light transmitted through the conduit;
A lid that is openably and closably connected to the housing via a hinge, and closes the upper opening of the groove in a closed position;
A pressing member that is held by the casing so as to be movable up and down, and is pushed down by the lid in accordance with a closing operation of the lid;
An operation member that holds the light emitting unit or the light receiving unit and moves the light emitting unit and the light receiving unit facing each other by operating in conjunction with the pressing of the pressing member;
A fluid concentration measuring device comprising: a stopper member that regulates the operation of the operating member and holds the light emitting unit and the light receiving unit at a predetermined interval. Two sets of the groove and the actuating member;
The fluid concentration measuring apparatus according to claim 1, further comprising a transmission member that simultaneously operates two operating members in conjunction with the pressing of the pressing member.   The fluid concentration measuring device according to claim 1, further comprising an elastic member interposed between the pressing member and the operating member.   The fluid concentration measuring device according to any one of claims 1 to 3, further comprising a biasing member that biases the actuation member in a direction in which the light emitting unit and the light receiving unit are spaced apart from each other. . A bubble detection device for detecting the presence or absence of bubbles in a fluid flowing in a deformable pipe,
A housing formed with an upwardly opening groove to which the conduit is mounted;
A transmitter that is disposed on one side of the groove and transmits ultrasonic waves on the surface of the pipe;
A receiving unit that is disposed opposite to the transmitting unit on the other side surface of the groove and receives the ultrasonic wave transmitted through the conduit;
A lid that is openably and closably connected to the housing via a hinge and closes the upper opening of the groove in a closed position;
A pressing member that is held in the casing so as to be movable up and down, and is pushed down by the lid in accordance with the closing operation of the lid;
An operating member that holds the transmitting unit or the receiving unit and moves the opposing transmitting unit and the receiving unit closer to each other by operating in conjunction with the pressing of the pressing member;
A bubble detection device comprising: a stopper member that regulates the operation of the operation member and holds the transmission unit and the reception unit at a predetermined interval.

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