JPH0221873A - Blood collection device which measure weight of collected blood - Google Patents

Abstract

PURPOSE:To stably enhance the accuracy of measurement of the amount of collected blood by providing a control means which receives a result of measurement by a weight measuring means in such a condition that a container support section is once stopped at a specific position during swinging process by a swinging means and which obtains the weight of a blood container from the result of the measurement. CONSTITUTION:A start switch 54 is turned on. A control device 18 controls the drive of a vacuum pump 17 and a swing motor 23 so as to perform blood collection due to depressurization in a vacuum blood collection chamber 13 and to swing a bag receiving pan 19. Further, the control device 18 receives an output from a weight sensor amplifying unit 38 with the timing of temporary stoppage by the bag receiving pan 19 at a lowermost position, and detects an amount of collected blood for measurement in a blood bag 1 while computing an amount (volume) of the remaining collected blood by the formula I with the use of a set collected blood amount, a specific weight of blood and a previously registered weight of the blood bag 1 which are stored in memory 66. Accordingly, the amount of collected blood is measured in accordance with a variation in the weight of the blood bag 1, and accordingly, it is possible to enhance the accuracy for the measurement.

Description

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

[Prior Art] Conventionally, a blood sampling device as described in Japanese Patent Publication No. 51-3153 has been proposed. In conventional blood sampling devices, a blood bag is housed in a blood sampling chamber, and a limit switch detects when the thickness of the blood bag, which expands as blood is drawn, has reached a predetermined level.The blood sampling operation is stopped based on this detection result, and the blood sampling operation is stopped. As a result, a predetermined amount of blood must be collected in the blood bag.

In addition, in conventional blood sampling devices, the blood bag tray is swung while blood is being collected into the blood bag, thereby stirring the blood and an anticoagulant such as heparin that is preloaded in the blood bag. I have to.

[Problem B to be Solved by the Invention] However, in the conventional blood sampling device described above, the amount of blood collected is measured when the thickness of the blood bag reaches a certain level, so the measurement accuracy is poor. .

Therefore, in order to improve the accuracy of measuring the amount of blood to be collected, it may be possible to measure the amount of blood to be collected by measuring changes in the weight of the blood bag during blood collection. However, at this time, when the blood bag and its tray are placed on the weight measuring means while the blood bag being collected is shaken in order to stir the anticoagulant and blood, the blood bag and its tray are shaken. Depending on the moving angular position, the load state of these loads on the measuring means changes significantly, making it impossible to stably measure the weight of blood sampled.

The present invention provides a method for collecting blood while shaking the blood container.
The purpose is to stably improve the measurement accuracy of the amount of blood collected.

[Means for Solving the Problems] The present invention as set forth in claim 1 provides a container support section for supporting a blood container, a swinging means for swinging the container support section during blood collection into the blood container, and a swinging means for swinging the container support section during blood collection into the blood container. A blood sampling device comprising a weight measuring means for measuring the weight of a blood container in
While the container support part is temporarily stopped at a specific position in the rocking process by the rocking means, the measurement results of the weight measuring means are taken in,
The apparatus includes a control means for determining the weight of the blood container based on the measurement results.

In the present invention according to claim 2, the swinging means includes a swinging motor and a swinging stand driven by the swinging motor, and the weight measuring means includes a swinging stand and a container support. The container support part is configured to temporarily stop at the specific position by controlling the stop of the swing motor.

In the present invention according to claim 3, the swinging means includes a swinging motor and a cam that is driven by the swinging motor to lift the container support part, and the weight measuring means includes a cam. It consists of a stopper that is installed at an intermediate position in the swingable range of the container support part determined by and stops the container support part during its descending process, and a scale on which this stopper is placed. The container supporting portion is configured to be temporarily stopped at the specific position.

[Function] According to the present invention as set forth in claim 1, blood can be collected while the blood container is rocked by the rocking means, and the weight of the blood collected can be measured by temporarily stopping the blood container at a specific position during the rocking process. It turns out. Therefore, the amount of blood to be collected is measured based on the measurement of the weight change of the blood container, and the measurement accuracy is high.Also, the blood container and its container support are stopped at a specific position when measuring the weight. , weighing hand,
The loading conditions of these loads on the stages are always the same, ensuring stable measurement of the weight of blood sampled. That is, when blood is collected while rocking the blood container, the accuracy of measuring the amount of blood to be collected can be stably improved.

According to the second aspect of the present invention, the container support part is temporarily stopped at a specific position in the swinging process by the stop control of the swing motor, and the stop control can be easily and gently performed by electrical control. realizable. At this time, if the blood container and its container support are slowly decelerated and stopped, the impact on the sensor constituting the weight measuring means will be reduced, and the accuracy of weight measurement can also be improved in this respect.

According to the third aspect of the present invention, mechanically reliable stop control can be achieved by setting the position of the stopper.

[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.

As shown in FIGS. 1 to 4, the blood sampling device 10 includes a display panel 12 on the front of the housing 11.
A vacuum blood collection chamber 13 is formed inside. 14 is the opening/closing lid of the blood collection chamber 13, 15 is the hinge of the lid 14, and 16 is the blood collection chamber 1.
This is a sealing rubber for sealing 3. 14A is a handle of the lid 14. Further, the blood sampling device 10 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 connected to the inlet port 17A of the vacuum pump 17 so as to be able to reduce the pressure, and is equipped with a bag tray 19 that supports a blood bag (blood container) made of polyvinyl chloride or the like. There is. The amount of blood to be collected W110 is determined by the amount of blood collected in the bag tray 19 while the vacuum blood collection chamber 13 is depressurized.
A predetermined proof pressure is applied to the blood bag 1 supported by the blood bag 1 to collect blood. At this time, the blood collecting device 10 shakes the bag tray 19 to stir the blood and an anticoagulant such as heparin that has been preloaded in the blood bag 1, and also collects blood by measuring the weight of the blood bag 1. measure quantity.

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 a connecting piece 30 integral with the swing frame 22. connected.

On the other hand, on the top surface of the swing frame 22, a pair of scales are attached.
A scale (weight measuring means) 33 is supported in a cantilever manner by a support plate 32 to which the remounting block 31 is fixed and which extends over the end of the remounting 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 lower surface and the lower surface to form a Wheatstone bridge circuit.
The aforementioned bar 2 bar receiving tray 19 is fixed via the receiving plate 36. 37 is a stopper that prevents the scale 33 from swinging from side to side, and 38 is a weight sensor amplification unit.

That is, the blood sampling device 10 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 33 to the swing frame 22.
This means that the bang receiving tray 19, which is supported via the bung receiving tray 19, is swung. In addition, the blood sampling device 10 supports a bar two receiving 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 The weight of the blood bag I is measured based on the change in the output of the strain gauge 34, and thus the amount of blood to be collected is measured.

The blood sampling device 10 detects the rotational position of the detection cam 39 provided at the other end of the driving shaft 24 using the optical sensor 4°.
As a result, the swing motor 23 is driven and controlled to stop the bag tray 19 at the lowest point (bottom dead center) and maintain it at a constant posture condition F, and as described above, the blood bag tray 19 is The weight of 1 is to be measured.

As shown in FIG. 5, the blood collection device 10 connects the inlet port 17A of the vacuum pump 17 and the vacuum blood collection 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. , when the exhaust solenoid 42 is turned off, M<exhaust%/<rube 43 is provided by gravity. Blood sampling device
O forms a constant negative pressure (degree of vacuum) in the vacuum blood collection chamber 13 by on/off control of the vacuum pump 17, and opens the vacuum blood collection chamber 13 to the atmosphere by opening the exhaust valve 43 at the end of blood collection.

The blood collection device 10 includes a tube holder 4 in the upper part of the front side of the housing 11 adjacent to the vacuum blood collection chamber 13.
4, so that a blood collection tube 2 connected to a blood bag 1 housed in a vacuum blood collection chamber 13 can be extended. The tube holder 44 includes a tube clamp (blood collection stopping means) 46 driven by a tube clamp solenoid 45, and the tube clamp 46 clamps and closes the blood collection tube 2 to stop the blood collection operation. 47 is a clamp release button for the tube clamp 46, and 48 is a clamp button for operating the tube clamp 46 in an emergency.

The display panel 12 of the blood sampling device 10 includes a blood sampling chamber/vacuum level switching indicator lamp 49 and a blood sampling amount/vacuum level switching switch 50.4.
00sJl / 200+1 +J1 conversion table non-display lamp 5100m! l/200 tumor changeover 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 collection @/vacuum level 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 18 of the blood sampling device IO will be explained.

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

The main control circuit 61 includes a CPU (central processing unit) [device 10
65. Memory (storage means) 66, input/output control section 67, LED (light emitting diode) drive circuit 6
8, a buzzer 69, and a safety circuit 70.

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

The L 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 manners depending on: ■ blood collection completion, ■ error in the negative pressure formed in the vacuum blood collection chamber 13, ■ rotation error in the swing motor 23, ■ detection of the pond surface by the shallow dish sensor 71, etc. It rings.

The fail-safe circuit 70 monitors the occurrence of runaway in the CPU 65, and safely stops the device in the event of runaway.

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 includes a weight sensor amplification unit 38 to which the aforementioned strain gauge 34 is connected.
At the same time, a pressure sensor 73 provided in the vacuum piping 41 and detecting the negative pressure of the vacuum blood collection chamber 13 is connected via a pressure 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 forms a linear function of y=aw+b with respect to the measured blood sample weight w. Also, C
The PU 65 calculates the pressure assuming that the output 2 of the pressure sensor 73 constitutes 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 solenoid 42;
, (2) a pump drive circuit 78 that turns on/off the power supply switch 77 of the vacuum pump 17, and (2) a motor drive circuit 80 that turns on/off the power supply switch 79 of the swing motor 23.

Note that the CPU 85 of the control device 18 controls the pressure sensor 7.
3 and the set pressure of the vacuum blood collection chamber 13 which is the data stored in the memory 66, and set the power supply switch 77 of the vacuum pump 17 as described above so that the detected pressure matches the set pressure. On/off control. 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, the blood sampling operation procedure based on the blood sampling amount MIO will be explained.

■Turn on the power switch 58.

■ Select the amount of blood to be collected using the changeover switch 52 for 400 and 7200 m1. 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, ) ripple (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 1 into the vacuum blood collection chamber 13 and the bag tray 1
9 and set the blood collection tube 2 in the tube holder 44.

■Turn on the start switch 54. The control device 18 drives and controls the vacuum pump 17 and the swing motor 23, and controls the vacuum blood collection chamber 1.
The control device 18 performs the blood collection by reducing the pressure in step 3 and swings the bag tray 19. Furthermore, the control device 18 controls the weight sensor amplification unit 3 at the timing when the bag tray 19 pauses at the lowest point.
8 is obtained, the measured blood collection amount of blood bag l is detected, and the following (+) Calculate the remaining blood collection amount (volume) using the formula.

Remaining blood sampling amount (l); [Setting blood sampling amount (g) Juyo registration weight (g) - Measured blood sampling amount (
g)] /Specific Gravity/Layered Text)...(1)■The control device 18 controls the blood collection tube 2 by the tube clamp 46 on the condition that the remaining blood collection amount, which is the result of the above calculation, has reached zero.
, and stop the blood collection operation into the blood bag L. 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.

After the blood collection is completed, the Φ control device 18 extends and drives the swing motor 23 for a certain period of time to swing the bag tray 19. After that, a buzzer notifies you that blood collection is complete.

(2) Turn on the clamp release button 47, remove the blood collection tube 2 from the tube holder 44, and take out the blood bag 1 from the vacuum blood collection chamber 13.

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

According to the embodiment described above, blood can be collected while the blood bag 1 is being rocked by the rocking motor 23, and the weight of the blood to be collected can be measured by temporarily stopping the blood bag 1 at a specific position during the rocking process. Therefore, the amount of blood to be collected is measured based on the measurement of the weight change of the blood bag 1, and the measurement accuracy is high.
Since the scale 9 is stopped at a specific position during one weight measurement, the load state of these loads on the scale 33 is always the same, and stable measurement of the blood sample weight is ensured. That is,
When blood is collected while swinging the blood bag 1, the accuracy of measuring the amount of blood to be collected can be stably improved.

Further, according to the above embodiment, the bag tray 19 is temporarily stopped at a specific position in the swinging process by the stop control of the swing motor 23, and the stop control can be easily and gently achieved by electrical control. At this time, if the blood bag 1 and its bag tray 19 are slowly decelerated and stopped, the impact on the strain gauge 34 of the scale 33 will be reduced, and the accuracy of weight measurement can also be improved in this respect.

The blood sampling device 100 shown in FIGS. 8 and 9 differs from the blood sampling device 10 described above in the structure for swinging the bag tray 101 and the structure for measuring the weight of the blood bag 1. Below is the amount of blood collected! The swinging structure and weight measuring structure of 100 will be explained, and the same parts in blood sampling device 1100 as in blood sampling device 10 are given the same reference numerals.

First, a scale 102 (described later) is installed at the bottom of the vacuum blood collection chamber 13, and a stopper 103 is placed on this scale 102.
1 is swingably supported. In addition, vacuum blood collection chamber 13
A mount 105 is installed at the bottom of the mount 105, a swing motor 106 is fixed to the mount 105, and a camshaft 107 driven by the swing motor 106 is supported. 108
．． 109 is a toothed pulley, and 110 is a toothed peltch. A cam 111 is fixed to the camshaft 107. That is, the cam 111 is driven by the swing motor 106 and comes into contact with the bottom back surface of the bag tray 101 to lift it up.
A bag tray 101 is made swingable around a support shaft 104.

Further, the above-mentioned stop/pa 103 is connected to the cam I as mentioned above.
The bag is installed at an intermediate position in the swingable range of the bag and tray lot determined by ll, and the bag tray lot is stopped in its descending process. 103A is a stop engaging portion. The scale 102 consists of a substantially rectangular (parallelogram) frame as shown in FIG. is 1
A light emitting element 113 is provided, and two light receiving elements 114A and 114B arranged vertically are provided on the other surface of the scale 102.

Note that 115 is a plate cam provided on the output shaft of the swing motor lO6 for confirming the original position, and 116 is an optical sensor operated by the plate cam 115.

That is, for this blood collection amount M100, the bag tray lot is swung by the lifting action of the cam 111 rotated by the swing motor 106, and the bag tray 101 is
is temporarily stopped by the stopper 103 during the downward swinging process, and the light receiving element 114A detects the weight change of the blood bag l supported by the bar two receiving tray 101 based on the deflection deformation of the scale 102.
It is measured by the change in the light reception ratio (ratio of the amount of light received) of and 114B, and in turn, the amount of blood collected. Measurement of the amount of blood to be collected based on the outputs of the light receiving elements 114A and 114B and control of the blood collection operation are executed by a control device similar to the control device 18 of the blood sampling device.

According to the blood sampling device 100, by setting the position of the stopper 103, it is possible to mechanically and reliably control the bag tray lot to stop at a specific position in its swinging process.

[Effects of the Invention] As described above, according to the present invention, when blood is collected while rocking the blood container, the accuracy of measuring the amount of blood to be collected can be stably improved.

[Brief explanation of the drawing]

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 broken away, FIG. The figure is a plan view showing the main part of FIG. 1 broken away, FIG. 5 is a vacuum circuit diagram, FIG. 6 is a control block diagram, FIG. 7 is a side view showing the scale, and FIG. 9 is a side view showing the blood sampling device according to the embodiment, FIG. 9 is a plan view showing the main part of FIG. 8 in a cutaway manner, and FIG. 10 is a front view showing the scale. ■...Blood bag (blood container), 10...Blood collection device, 19...Bag tray (container support part), 22...Swing frame (swing table), 23...Swing motor , 33... Scale (weight measurement means), 65... CPU (control means), 100... Blood collection device, 101... Bag tray (container support part), 102...
Scale (weight measuring means) 103... Stopper, 106... Swing motor, 111... Cam.

Claims (3)

[Claims] (1) It has a container support part that supports the blood container, a swinging means for swinging the container support part during blood collection into the blood container, and a weight measurement means for measuring the weight of the blood container during blood collection. In the blood sampling device, the measurement result of the weight measuring means is taken in while the container support part is temporarily stopped at a specific position in the rocking process by the rocking means, and the weight of the blood container is determined based on this measurement result. A blood sampling device for measuring the weight of collected blood, characterized by comprising a control means. (2) The rocking means includes a rocking motor and a rocking table driven by the rocking motor, and the weight measuring means is interposed between the rocking table and the container support. 2. The blood sampling device for measuring the weight of blood sampled according to claim 1, further comprising a scale configured to temporarily stop the container supporting portion at the specific position by controlling the stop of the swing motor. (3) The swinging means includes a swinging motor and a cam that is driven by the swinging motor to lift the container support, and the weight measuring means swings the container support determined by the cam. It consists of a stopper that is installed at an intermediate position of the movable range and stops the container support part during its lowering process, and a scale on which this stopper is placed, and the container support part is moved to the specific position by setting the position of the stopper. 2. A blood sampling device for measuring the weight of blood sampled according to claim 1, wherein said blood sampling device is configured to temporarily stop said blood sampling device.