JPH0221874A - Blood collection device which measure weight of collected blood - Google Patents

Abstract

PURPOSE:To precisely measure 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 at a certain 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 staying of the bag receiving pan at a certain position during swinging thereof, and detects an amount of collected blood for measurement in a blood bag 1 while computing an amount (volume) of the remaining collected blood 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, it is possible to precisely measure the amount of collected blood which increases moment by moment, under such an condition that the blood collection is carried out while swinging the blood bag 1.

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. A conventional 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 stretched during blood sampling 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 blood bag.

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

In addition, in the blood sampling device, it is necessary to shake the blood bag tray while blood is being collected into the blood bag, thereby sufficiently stirring the blood and the anticoagulant such as heparin that is preloaded in the blood bag. There is.

In addition, when measuring the amount of blood collected by weight, if the weight measuring means (especially the sensor) is fixed in the blood sampling chamber and is brought into contact with the swinging container support at one point, the weight measuring means will be affected by the impact of the contact. In order to obtain an accurate value, the sensor changes over time.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to precisely measure the amount of blood collected under conditions in which blood is collected while swinging a blood container.

Furthermore, it is an object of the present invention to prevent direct impact of rocking from being applied to the weight measuring means (particularly the sensor).

[Means for Solving the Problems] The present invention provides a container support section that supports a blood container, a swinging means that swings the container support section during blood collection into the blood container, and a device that reduces the weight of the blood container during blood collection. In the blood sampling device comprising a weight measuring means for measuring, the swinging means includes:
The weight measuring means is composed of a scale fixed to the lower part of the container support, and the weight measuring means is comprised of a scale fixed to the lower part of the container support. At any position in the swinging process, ff
(The apparatus is equipped with a control means that takes in the measurement results of the gate M determination means and determines the weight of the blood container based on the measurement results.

[Function] According to the present invention, the rocking table that constitutes the rocking means supports the container support section through the scale that constitutes the weight measuring means while being rocked by the power generation mechanism. Therefore, while the blood container supported by the container support section is being swung to increase the amount of blood to be collected, the change in weight of the blood container can be measured with a scale at every timing of blood collection.

As a result, the control means takes in the measurement results of the scale when the container support part is at any position of its rocking iM, in other words, at all timings of blood sampling, and ultimately determines the weight of the blood container. . That is, according to the present invention, it is possible to precisely measure the amount of blood to be collected, which increases moment by moment, while blood is being collected while the blood container is being rocked.

Furthermore, the scale constituting the weight measuring means is similarly swung,
Since the scale does not come into contact with the container support, the scale is not affected by this contact and accurate measurements are possible.

[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. 4 is a plan view showing a main part of FIG. 1 broken away, FIG. 5 is a vacuum circuit diagram, FIG. 6 is a control block diagram, and FIG. 7 is a side view showing the 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 M14. The blood sampling device i10 also includes a vacuum pump 17. and a built-in control device M18.

The vacuum blood collection chamber 13 of the blood collection device IO is communicated with the inlet port 17A of the vacuum pump 17 to be able to reduce the pressure, and is equipped with a bag tray 19 that supports a blood bag (blood container) 1 made of polyvinyl chloride or the like. There is. The blood sampling device 10 is
While the pressure in the vacuum blood collection chamber 13 is reduced, a predetermined negative pressure is applied to the blood bag l supported on the bag receiving tray 19 to collect blood. At this time, the blood collecting device 19 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 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. N33 is 2 on the top
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 Bully circuit.
．． The bag receiving tray 19 described above is fixed via the receiving plate 36. 37 is a stopper that prevents the balance 33 from swinging from side to side;
38 is a weight sensor amplification unit.

That is, the blood sampling amount MIO is determined by rotating the driving shaft 24 and the crank wheel 28 by the operation of the swing motor 23, thereby swinging the swing frame 22, and placing the scale 33 on the swing frame 22.
This means that the bag tray 19, which is supported through the bag tray 19, is swung. In addition, the blood sampling amount FIllO is determined by the swing frame 22
A bag tray 19 is supported on a scale 33 which is cantilever-supported via a mounting block 31 and a support plate 32.
Based on the change in the output of the strain gauge 34 based on the deflection deformation of the scale 33, the weight of the blood bag 1I7) is measured, and thus the amount of blood collected is 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 with a vacuum pipe 41, and connects the vacuum pipe 41 to the middle part thereof.

The exhaust valve 43 is closed when the exhaust solenoid 42 is turned on and opened by gravity when the exhaust solenoid 42 is turned off. The blood sampling device) 10 maintains a constant negative pressure (degree of vacuum) in the vacuum blood sampling chamber 13 by on/off control of the vacuum pump 17.
When the blood collection is completed, the exhaust valve 43 is opened to release the vacuum blood collection chamber 13 to the atmosphere.

Blood collection? The tube holder 44 is provided in the upper part of the front side of the housing 11 adjacent to the vacuum blood collection chamber 13, so that the blood collection tube 2 connected to the blood bag 1 housed in the vacuum blood collection chamber 13 can be pulled out. The tube holder 44 is.

A tube clamp (blood collection stop means) 46 is provided which is 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 into the blood bag l. 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 ffi/X empty level switching display lamp 49 and a blood sampling amount/vacuum level switching switch 50.
, 400■ exchange / 200m sentence switching indicator lamp 51.40
0■ Exchange/200m viewing changeover switch 52, stop switch 5
3. Start switch 54, used bag display lamp 55, used bag selection switch 56. Blood collection amount/vacuum level display section 57
Equipped with. 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 t18 for controlling the blood sampling amount M10 will be explained. As shown in FIG. 6, the control section fi18 mainly includes a main control circuit 61. It is composed of 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 N) [system M10
65, memory (storage means) 66, input/output control unit 67, LED (light emitting diode) drive circuit 6
8, a buzzer 69, and a fail-safe circuit 70. In addition.

A detection signal from a sensor 71 that detects blood leakage from the blood bag 1 is transferred to the input/output control section 67 .

4; The memory 66 is composed of a nonvolatile 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 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 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.

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;
(1) A pump drive circuit 78 that turns on/off the power supply switch 77 of the vacuum pump 17; (2) A motor drive circuit 80 that turns on/off the power supply switch 79 of the swing motor 23.

Note that the CPU 65 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 turn on the power supply switch 77 of the vacuum pump 17 as described above so that the detected pressure matches the set pressure. /Off control. This results in
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 1110 will be described.

■Turn on the power switch 58.

■400 servings/2o0■ Selecting the amount of blood to be collected using the sentence 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. The types of bags used are single (S) with only a parent bag, double (D) with one or more small bags,
) There are ripples (T) and quadruples (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 ff118 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 tray 19. At a timing at an arbitrary position during the movement process, the output of the weight sensor amplification unit 38 is obtained to detect the measured blood collection amount of the blood bag 1, and also to detect the set blood collection amount, blood specific gravity, and blood density written in the memory 66. Using the pre-registered weight of the blood bag 1, the remaining blood collection amount (indication) is calculated by the following equation (1).

Remaining blood sampling amount (- sentence) = [Setting blood sampling amount (g) Juyo registration weight (g) - Measured blood sampling amount (
g)] /Specific Gravity/Otori 1)... (1)■ The control device 18 controls the blood sampling tube 2 by the tube clamp 46 on the condition that the remaining blood sampling tube, which is the result of the above calculation, has reached zero.
, and the operation of collecting blood into the blood bag 1 is stopped. At this time, the control device 2!18 stops the vacuum pump 17 and opens the exhaust valve 43 to release the vacuum blood collection chamber 13 to the atmosphere.

(2) After the blood collection is completed, the 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 l from the vacuum blood collection chamber 13.

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

According to the above embodiment, the swinging frame 22 (swinging table) constituting the swinging means is swung by the swinging motor 23 while the bag receiving tray 19 (container supporting part). Therefore, the blood bag supported on the bag tray 19! (Blood container) is rocked to increase the amount of blood collected, and the weight change can be measured by the scale 33 at all timings of blood collection.

As a result, the CPU 65 (control means) takes in the measurement results of the scale 33 when the bag tray 19 is at any position during its swinging process, in other words, at all the timings of blood sampling, and ultimately calculates the weight of the blood bag l. I will ask for it. That is, according to the above embodiment, it is possible to precisely measure the amount of blood to be collected, which increases moment by moment, under the condition that blood is collected while the blood bag is being rocked.

In addition, a scale 33 is fixed at its tip end via a weighing stand 35 and a receiving plate 36 to the lower part of the bag receiving tray 19, and the scale 33 is fixed to the swinging frame 22 via a support plate 32, so that it cannot swing. Due to the operation of the motor 23, the swing frame 22
, the scale 33, and the bag tray 19 will swing together.

Therefore, unlike the case where the scale 33 is fixed to another part without swinging and the weight is measured by contacting with the bag receiving tray, accurate measurement can be performed without the impact of contact.

Note that in carrying out the present invention, the power generating mechanism is not limited to the swing motor.

[Effects of the Invention] As described above, according to the present invention, the amount of blood collected can be precisely measured while blood is collected while shaking the blood container. Moreover, the weight measuring means can perform accurate measurements without being subjected to impact.

[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 drawings are a plan view showing a main part of FIG. 1 broken away, FIG. 5 a vacuum circuit diagram, FIG. 6 a control block diagram, and FIG. 7 a side view showing the scale. l...Blood bag (blood container), 10...Blood sampling device. 19... Bag tray (container support part), 22... Swinging frame (swinging table), 23... Swinging motor (power generation mechanism), 33... Scale (weight measuring means). 65...CPU (control means). Figure 1

Claims (1)

[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 rocking means includes a power generating mechanism and a rocking table driven by the power generating mechanism, and the weight measuring means includes a scale fixed to a lower part of the container support. and a control means for taking in the measurement result of the weight measuring means when the container support part is at any position during the rocking process by the rocking means, and determining the weight of the blood container based on this measurement result. A blood sampling device for measuring the weight of blood sampled.