JPH0226561A - Blood taking device which measures weight of taking blood - Google Patents

Abstract

PURPOSE:To exactly take blood at a set weight by stopping the blood taking operation to a blood container on condition that the weight of the blood taken in the blood container attains the set weight of blood taking. CONSTITUTION:The weight of the blood container is measured by a frame- shaped balance 33 which supports the blood container during blood taking. This balance 33 has a strain gage 34 to measure the strain change by the weight of the taking blood of the frame body. The output of the strain gage 34 is compared with the set weight of the blood taking previously inputted and stored by an input means and the blood taking operation to the blood container is stopped by a tube clamp when the weight of the blood taken in the blood container attains the set weight of blood taking.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a blood collection station for measuring the weight of blood collection.

[Prior Art] Conventionally, a blood sampling device as described in Japanese Patent Publication No. 51-3153 has been proposed. A circulating blood sampling device stores a blood bag in a blood sampling chamber, uses a limit switch to detect when the thickness of the blood bag that expands as blood is drawn reaches a predetermined level, and stops the blood sampling operation based on this detection result. As a result, a predetermined volume of blood is secured in the serum bag.

[Problems to be Solved by the Invention] However, the conventional blood sampling device described above has the following problems.

■The measurement accuracy is poor because the amount of blood collected is measured when the thickness of the blood bag reaches a certain level.

(2) When changing the target value of the amount of blood to be collected, it is necessary to change the operating point of the limit switch mechanically in order to change the detection level of the limit switch, which deteriorates the workability of measurement.

An object of the present invention is to improve the accuracy of measuring the amount of blood sampled and to improve the workability of the measurement.

[Means for Solving the Problems 1] The present invention as set forth in claim 1 is a blood collection device for collecting a predetermined amount of blood into a blood container, which comprises a frame-like scale that supports the weight of the blood container during blood collection, A weight measuring means equipped with a measurement sensor for measuring the strain change due to the blood sampling weight of the frame body, a blood sampling stopping means for stopping the blood sampling operation to the blood container, and a blood sampling stop means for inputting the set blood sampling amount to the blood container. An input means, a storage means for storing the input set blood sampling amount, and a measurement result of the measurement means and data of the set blood sampling amount stored in the storage means are obtained, and the blood sampling is performed in the blood container. The apparatus further includes a control means for causing the blood collection stop E means to stop the blood collection operation into the blood container on the condition that the blood collection amount reaches the set blood collection amount.

The present invention according to claim 2 is characterized in that the measurement sensors of the weight measuring means are formed from strain gauges that are attached to two positions on the top surface and a second position on the bottom surface of the frame-shaped scale to form a Wheatstone bridge circuit. It was made so that it would become so.

The present invention according to claim 3 is characterized in that the measurement sensor of the weight measuring means is arranged vertically with a light emitting element provided on one of the two opposing inner surfaces of the frame-shaped scale and on the other surface. It is made up of two or more light receiving elements provided.

[Effect]

According to the present invention as set forth in claim 1, the set blood collection amount input by the input means is stored in the storage means, the weight measurement means measures the blood collection amount into the blood container, and the control means adjusts the measured weight. The timing at which the set amount of blood to be collected is reached will be monitored. Then, when the above timing is reached, the control means drives the blood collection stop means to stop the blood collection operation into the blood container.

Therefore, according to the present invention as set forth in claim 1, (1) the amount of blood collected is measured by the change in the weight of the blood container;
The measurement accuracy is high. In particular, since the weight setting means is composed of a frame-shaped scale, changes in strain of the frame can be made to correspond well to changes in the weight of the blood container, and measurement accuracy can be improved. In addition, it is possible to automatically secure a constant amount of blood by simply electrically monitoring the timing when the weight of the blood container reaches the target value of the amount of blood to be collected. It is sufficient to change the timing electrically, and the workability of measurement is good.

In the present invention as set forth in claim 2, since the weight measuring means is composed of a frame-shaped scale equipped with a strain gauge, the strain change of the frame can be made to correspond well to the weight change of the blood container. Measurement accuracy can be improved.

The present invention according to claim 3 is characterized in that the weight measuring means is composed of a frame-shaped scale equipped with a light emitting element and a light receiving element.
The strain change of the frame can be made to correspond well to the weight change of the blood container, and measurement accuracy can be improved. Furthermore, optical elements have advantages over strain gauges, such as less change in characteristics due to humidity and less change in characteristics due to assembly state.

[Example] Fig. 1 is a front view showing a blood sampling device according to an embodiment of the present invention, Fig. 2 is a side view showing a main part of Fig. 1 cut away, and Fig. 3 is a plan view of Fig. 1. Figure 4 is a cutaway plan view of the main parts of Figure 1, Figure 5 is a vacuum circuit diagram, Figure 6 is a control block diagram, Figure 7 is a side view of the scale, and Figure 8 is a side view of the scale. FIG. 9 is a side view showing a blood sampling device according to another embodiment of the present invention, FIG. 9 is a plan view showing a main part of FIG. 8 cut away, and FIG. 10 is a front view showing a scale.

The blood sampling device 10 includes a display panel 12 on the front side of a housing 11, as shown in FIGS. 1 to 4, and a vacuum blood sampling chamber 13 is formed inside the housing 11. 14 is blood collection room 1
3 is the opening/closing lid, 15 is the hinge of the lid 14, and 16 is the blood collection chamber 13.
It is a sealing rubber for sealing. 14A is a handle of M14. In addition, the blood sampling device IO includes a vacuum pump 17 and a control device 18 in the lower part of the housing 11.

The vacuum blood collection chamber 13 of the blood collection device 10 is communicated with the suction port 17A of the vacuum pump F to be able to reduce the pressure, and is equipped with a bag tray 19 that supports a blood bag (blood container) l made of polyvinyl chloride or the like. . The blood sampling device 10 is
While the vacuum blood collection chamber 13 is depressurized, blood is collected by applying a predetermined negative pressure to the blood bag 1 supported by the bag receiving tray 19. At this time, the blood sampling device 110 receives the bar I
The blood bag 1 is shaken to stir the blood and anticoagulant such as heparin that has been preloaded in the blood bag 1.
The amount of blood collected is determined by measuring the weight of the sample.

The structure for swinging the above-mentioned bag tray 19 and the structure for measuring the weight of the blood bag 1 in the blood collection device 1O are as follows.

First, a pedestal 20 is installed at the bottom of the vacuum blood collection chamber 13,
A swing frame 22 that is rotatable is supported on this pedestal 20 via a support shaft 21 .

Further, a swing motor 23 is fixed to the pedestal 20, and a driving shaft 24 driven by the swing motor 23 is supported. 25 and 26, the toothed pulley 27 is a toothed belt. A crank wheel 28 is fixed to one end of the driving shaft 24,
One end of a link 29 is connected to the rotation radius of the crank wheel 28, and the other end of the link 29 is connected to the swing frame 22.
It is connected to a connecting piece 30 that is integral with the.

On the other hand, a pair of scale mounting blocks 31 are fixed to the upper surface of the swinging frame 22, and a scale (weight measuring means) 33 is cantilever-supported on a support plate 32, which extends over the end of the one-car mounting block 31. . The scale 33 has a substantially rectangular shape (
It consists of a parallelogram frame. The scale 33 is on the top 2
A strain gauge 34 as a weight sensor is attached to each of the two positions on the bottom surface and the bottom surface to form a Wheatstone pulley circuit.
, the aforementioned bag receiving tray 19 is fixed via a receiving plate 36. 37 is a stator that prevents the balance 33 from swinging from side to side.
38 is a weight sensor amplification unit.

That is, the blood sampling device 110 rotates the driving shaft 24 and the crank wheel 28 by the operation of the swing motor 23, thereby swinging the swing frame 22, and attaching the scale 3 to the swing frame 22.
This means that the bag tray 19, which is supported through 3, is swung. In addition, the blood sampling device 10 supports a bag tray 19 on a scale 33 that is cantilever-supported via a mounting block 31 and a support plate 32 on the swing frame 22, and a strain gauge based on the deflection deformation of the scale 33. The weight of the blood bag 1 is measured based on the change in the output of 34, and thus the amount of blood collected is measured.

The amount of blood to be collected 2110 is determined by detecting the rotational position of the detection cam 39 provided at the other end of the driving shaft 24 using the optical sensor 40, and thereby driving and controlling the swing motor 23 to move the bag tray 19 to the lowest point ( The weight of the blood bag 1 is measured as described above while the blood bag 1 is stopped at the bottom dead center (bottom dead center) and maintained under constant posture conditions.

As shown in FIG. 5, the blood sampling device IO connects the inlet port 17A of the vacuum pump 17 and the vacuum blood sampling chamber 13 through a vacuum pipe 41, and connects the vacuum pipe 41 to an intermediate portion thereof, which is closed by turning on an exhaust solenoid 42. , an exhaust valve 43 that opens by gravity when the exhaust solenoid 42 is turned off. Blood sampling device i!
tlo creates a constant negative pressure (degree of vacuum) in the vacuum blood collection chamber 3 by on/off control of the vacuum pump 17, and opens the exhaust valve 43 at the end of blood collection to open the vacuum blood collection chamber 1.
3 is released to the atmosphere.

The +11 mounting 2110 is the one on the front side of the housing 11.
A tube holder 44 is provided in a portion adjacent to the vacuum blood collection chamber 13, so that the blood collection tube 2 connected to the blood bag l housed in the vacuum blood collection chamber 13 can be pulled out.

The tube holder 44 is connected to the tube clamp solenoid 4.
Tube clamp (blood collection stop means) driven by 5
46, the tube clamp 46 is provided with a blood collection tube 2.
47 is the clamp release button of the tube clamp 46,
48 is a clamp button that operates the tube clamp 46 in an emergency.

The display panel 12 of the blood sampling device 10 displays “Blood sampling!” /Vacuum degree switching indicator lamp 49. Blood collection amount/vacuum degree selection switch 50.4
0h sentence/200m exchange switching indicator lamp 51, 400m 1
/200m switch 52, stop switch 53. It includes a start switch 54, a used bag display lamp 55, a used bag changeover switch 56, and a blood sampling amount/degree of vacuum display section 57. The blood sampling device 10 includes a power switch 58 and a fuse holder 59 at the lower front of the housing 11, and a power connector 60 at the lower rear of the housing 11.

Next, the control device M18 of the blood sampling device 10 will be explained.

As shown in FIG. 6, the control u4 device 18 mainly includes a main control circuit 61, a drive circuit 62, and a display circuit 63. Note that 64 is a power supply unit.

The main control circuit 61 includes a CPU (central processing unit) [system 221
65, memory (storage means) 66, input/output control section 67, LED (light emitting diode) drive circuit 68, buzzer 69, failsafe circuit 70 has.

In addition, each detection signal of the above-mentioned optical sensor 40 that detects the swinging position of the bag receiving tray 19 and the pond surface sensor 71 that detects blood leakage from the blood bag 1 is transferred to the input/output cull control unit 67. It has become.

The memory 66 is composed of a non-volatile memory such as EA-ROM or EEP-ROM, and can read and rewrite stored data, and can hold stored data even without application of a power supply voltage. The data stored in the memory 66 includes (1) the negative pressure generated in the vacuum blood collection chamber 13, (2) the set amount of blood to be collected into the blood bag 1, (2) the extended period of swinging of the bag tray 19 after the blood collection is completed, etc.

The buzzer 69 sounds in different ways depending on the following: ■ Blood collection completion, ■ Error in the negative pressure formed in the vacuum blood collection chamber I3, ■ Rotation error in the swing motor 23, ■ Detection of the surface of the pond surface sensor 71, etc. It beeps.

The failsafe circuit 70 monitors the occurrence of runaway in the CPU 65 and safely stops the device when the runaway occurs.

The drive circuit 62 is connected to the main control circuit 61, and
/D conversion circuit 72 is provided. The A/D conversion circuit 72 is connected to the ff1ffi sensor amplification unit 38 in which the strain gauge 34 described above is connected, and the pressure sensor 73 that is installed in the vacuum piping 41 and detects the negative pressure in the vacuum blood collection chamber 13 is connected to the pressure It is connected via a sensor amplification circuit 74.

At this time, the CPU 65 of the control device 18 calculates the blood sample weight on the assumption that the output y of the strain gauge 34 constitutes a linear function of measurement blood sample type (y=aw+b for 1w.
The CPU 65 calculates the pressure assuming that the output 2 of the pressure sensor 73 forms a linear function of z=cp+d with respect to the measured pressure p.

The drive circuit 62 also includes: (1) a solenoid drive circuit 75 that controls the tube clamp solenoid 45; (2) a solenoid drive circuit 76 that controls the exhaust valve/id 42;
■Pump drive circuit 78 that turns on/off the power supply switch 77 of the vacuum pump 17, ■Motor drive circuit 80t- that turns on/off the power supply switch 79 of the swing motor 23.
Be prepared.

Note that the CPU 65 of the ffj control device 18 obtains the detected pressure of the pressure sensor 73 and the set pressure of the vacuum blood collection chamber 13, which is data stored in the memory 66, and adjusts the detected pressure so that it matches the hill part set pressure. , the power supply switch 77 of the vacuum pump 17 is controlled on/off as described above. As a result, the negative pressure in the vacuum blood collection chamber 13 changes minutely within a certain range of the set pressure, resulting in a constant pressure state.

Next, a blood sampling operation procedure using the blood sampling apparatus 10 will be described.

■Turn on the power switch 58.

The amount of blood to be collected is selected using the 0400m1/200mM changeover switch 52. This selection result is displayed on the switching display lamp 51.

■Select the bag to be used using the bag selection switch 56. This selection result is displayed on the display lamp 55. In addition, as for the type of bag used.

There are single (S) with only a parent bag, double (D) with one or more small bags, triple (T), and quadruple (Q).

■Puncture the blood donor with the blood collection needle provided at the end of the blood collection tube 2, and collect some blood.

■Put the blood bag l into the vacuum blood collection chamber 13 and bag receiver tray 1.
9 and set the blood collection tube 2 in the tube holder 44.

+i) Turn on the start switch 54. The control device M18 drives and controls the vacuum pump 17 and the swing motor 23 to collect blood by reducing the pressure in the vacuum blood collection chamber 13 and swing the bag receiver ff119. At the timing when the system temporarily stops i) due to a decline in quality, the output of the sensor amplification unit 38 is obtained to detect the training blood collection site of the blood bag l, and the setting blood collection written in the memory 66 is , blood specific gravity, and pre-registered blood bar I, the remaining blood collection volume (volume) is calculated using the following equation (1).

Remaining surface positive Cl text) = "Setting seed harvesting loan (g) Juyoto trowel loading (g) - Measurement bare surface 1 (
+c) 1/specific gravity (8/meal sentence)...(1)■Control!
The I device 18 closes the blood collection tube 2 with the tube clamp 46 and stops the bare surface operation to the blood bag ν on the condition that the remaining bare surface amount reaches zero, which is the result of the above calculation. let At this time, the control device 18 stops the vacuum pump 17 and opens the exhaust valve 43 to release the vacuum blood collection chamber 13 to the atmosphere.

■ System 2a equipment W18 continues to extend and drive the swing motor 23 for a certain period of time after the completion of the bare surface described above, and swings the bag. After that, the buzzer will notify you that the blood collection is complete.

(Turn on the clamp release button 47 and close the blood collection tube 2.)
is removed from the tube holder 44, and the self-cleaning blood collection chamber 13 is taken out from the vacuum blood collection chamber 13.

First, the operation of the above embodiment will be explained.

According to the above embodiment, the switch 505 of the display panel 12
2.53.54.56 are stored in the blood collection receiving side memory 66, the amount of blood collected into the blood bag 1 is measured by the scale 33, and the CPU 65 determines the leg side "i? weight". Then, when the above timing is reached, the CPU 85
This causes the tube clamp 46 to move to lK#jI and stops the operation of drawing blood into the blood bag l.

However, according to Example I, the amount of blood collected is measured by the change in the weight of the blood serum knob 1, so the measured value of 111 degrees is high; Just by electrically monitoring the timing related to the eye tank value, you can automatically ensure the amount of blood to be collected.If the amount of blood to be drawn is directly related to the eye tank value, the above monitoring timing can be set electrically. By changing the size, the workability of measurement is improved.

In addition, since the Tk amount measuring means consists of a frame-like member 33 equipped with a strain gauge 34, it is possible to respond to changes in the weight of the blood bag 1 on the strain-changing side of the frame, and the MS
'I can handle my M degree.

The amount of blood collected by the blood sampling device IOO shown in FIGS. 8 and 9 is different from the amount M10 of blood collected in L in that the bag tray 101 is rocked and the weight of the serum bar I0 is measured. Below, the swing line of the blood sampling device 100;
The same parts as the reef 10 are given the same reference numerals.

First, at the bottom of the vacuum blood collection chamber 13, there are 3 scales 102, which will be described later.
9 M, a stopper 103 is attached to this scale 102, and a bag 9 is attached to this scale 103 via the spinal column 104J.
@101 is swingably supported. In addition, a protrusion 105 is installed at the bottom of the X empty blood collection chamber 13, and this one
Is the swing motor 106 responsible for 5? and swing motor 1
A camshaft 107 driven by 06 is supported.

108 and 109 are toothed pulleys, and 110 is a toothed belt. Is cam txt the cause of camshaft 107? has been done. That is, the cam 111 is driven by the swing motor 106 and the bag? It comes into contact with the Sakibe mask of @101, and the bag is rotated around support M104.

In addition, the above-mentioned stash bar 103 is connected to the cam 11 as described in h.
Umaru bag depending on 1? It is installed at the middle position of the swingable WL enclosure of @101, and the bag 9 dish 101 is stopped at its lower culm. 103A is a stop engaging portion. Scale 1
02 consists of a substantially rectangular (parallelogram) frame as shown in the StO diagram, and an arm 102A extending from one of the two opposing inner surfaces of the scale 102 has one end. A light emitting element 113 is provided, and on the ugly side of the scale 102 there are 241 fluorescent elements 114A lined up below.

114B is provided.

Note that 115 is a plate cam provided on the output shaft of the swing motor 106 for confirming the original position, and 1161 is an optical sensor operated by the plate cam 115.

That is, in this blood collection 911100, the bag+ff1LIO11 is swung by the swinging action of the cam 111 rotated by the W4h motor 106, and this bag... @l OI I @ At the descending culm of the culm, the strainer 103 is temporarily stopped, and the weight change of 111 + baggage 1 supported by the bag tray 101 is calculated by calculating the fluorescence ratio of the light receiving elements 114A and 114B based on the deflection deformation of the scale 102 ( Due to changes in the amount of light (specific gravity), the angle of view changes, and as a result, the angle of view changes. Measurement of the amount of bare surface based on the output of the fluorescent elements 114A and 114B and control of the root surface operation are performed in step 1.
This is carried out by a control device similar to the control device 18 of the IilI device.

I wrote my own story! According to vsttoo, since the two weight measurement tools are made up of a rod-shaped scale 102 equipped with a light-emitting element 113 and fluorescent elements 114A and 114B, changes in the strain of the rod can be measured by changes in the weight of the white liquor bag 1. (It can be made to correspond, and the measurement end +t can be redirected.) In addition, optical elements 113.11
4A and 1148 have advantages over strain gauges, such as less change in performance due to humidity and less change in characteristics due to one assembled state.

In addition, in the important role of the present invention, other sensors such as a capacitance type pressure sensor can also be used as the measurement sensor constituting the TT measurement tip.

``Effects of the Invention'' As described above, according to the great invention, it is possible to improve the efficiency of measuring the amount of blood sampled and to improve the workability of the measurement.

[Brief explanation of the drawing]

11 is an underwater front view of a blood sampling device according to an embodiment of the present invention, FIG. 2 is a side view showing a main part cut away from FIG.
The figure is a plan view of Fig. 1, Fig. 4 is a plan view showing the main parts of Fig. 1 broken away. Fig. 1w45 is a vacuum circuit diagram, Fig. 6 is a control block diagram, and Fig. @7 is a side view showing the scale. , FIG. 8 is a side view showing a naked face grilled according to another embodiment of the great invention, FIG. 9 is an underwater plan view with the main part of FIG. 8 cut away, and FIG. 10 is a front view showing a review. It is. 1...Serum bag (self-service device), 10...Blood collection #place. 33... Scale (weight measuring hand). 34... Strain gauge, 46... Tube clamp (blood collection stop hand), 50.
52.53.54.56 ...Switch (input hand). 65...CPU (control half-dead) 66...Memory (memory note). 100...11iIl1g snow. 102... Scale, 113... Light emitting element. 114A, 114B... Light receiving elements.

Claims (3)

[Claims] (1) In a blood collection device that collects a predetermined amount of blood into a blood container, it consists of a frame-shaped scale that supports the weight of the blood container during blood collection, and a measurement sensor that measures strain changes in the frame due to the weight of blood collection. a weight measuring means comprising: a blood collection stop means for stopping the operation of blood collection into the blood container; an input means for inputting a set amount of blood to be collected into the blood container; and a storage means for storing the input set amount of blood to be collected. , after obtaining the measurement result of the weight measuring means and the set blood collection amount data stored in the storage means, and on condition that the blood collection amount to the blood container reaches the set blood collection amount, the blood collection stop means transfers the blood to the blood container. 1. A blood sampling device for measuring the weight of blood sampled, comprising a control means for stopping the blood sampling operation. (2) The blood collection weight according to claim 1, wherein the measuring sensor of the weight measuring means comprises a strain gauge attached to each of two positions on the upper surface and two positions on the lower surface of the frame-like scale to form a Wheatstone bridge circuit. A blood sampling device that measures blood. (3) The measurement sensor of the weight measuring means includes a light emitting element provided on one of the two opposing inner surfaces of the frame-shaped scale and two or more light receiving elements provided vertically in line on the other surface. 2. A blood sampling device for measuring the weight of blood sampled according to claim 1, comprising: an element;