JPH0554994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum blood sampling device for collecting blood into a blood container.

[Prior Art] Conventionally, a vacuum blood sampling device as described in Japanese Patent Publication No. 51-3153 has been proposed. The vacuum blood sampling device is equipped with a vacuum blood sampling chamber in which the pressure is reduced by a vacuum pump and a blood container is set, and blood is drawn into the blood container by the negative pressure generated in the vacuum blood sampling chamber.

Here, the negative pressure generated in the vacuum blood collection chamber and applied to the blood container acts as a blood collection suction force on the donor's blood vessel via the blood collection needle connected to the blood container.

Therefore, the negative pressure needs to be set at an appropriate predetermined level in consideration of the workability of blood collection and the burden on the blood donor.

In order to adjust the pressure in the vacuum blood collection chamber to a predetermined level, a conventional vacuum blood collection device includes a pressure regulating valve in the vacuum piping that connects the vacuum pump and the vacuum blood collection chamber. This pressure regulating valve activates its spring-operated leak mechanism when the pressure in the vacuum blood collection chamber reaches a target level, thereby maintaining the pressure in the vacuum blood collection chamber at a predetermined level.

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

Even after the pressure in the vacuum blood collection chamber reaches the target level, the vacuum pump continues to operate, resulting in inconveniences such as poor electrical efficiency and heat generation.

Due to deterioration of the seal portion and operating spring of the leak mechanism that constitute the pressure regulating valve over time, the control pressure thereby changes, making it difficult to maintain the desired target pressure.

Changing the set pressure is not easy because it is done by adjusting the spring force of the operating spring.

An object of the present invention is to improve electrical efficiency and ensure a stable control state over time when controlling pressure to generate a constant negative pressure state in a vacuum blood collection chamber.

Another object of the present invention is to make it possible to easily change the setting of the level of negative pressure generated in the vacuum blood collection chamber.

[Means for Solving the Problem] The present invention as set forth in claim 1 includes a vacuum blood collection chamber in which the pressure is reduced by a vacuum pump and a blood container is set, and blood is collected by negative pressure generated in the vacuum blood collection chamber. A vacuum blood collection device that collects blood into a container includes a pressure sensor that detects the pressure in a vacuum blood collection chamber, a storage means that stores a set pressure to be generated in the vacuum blood collection chamber, and a detected pressure of the pressure sensor and a set pressure of the storage means. and control means for controlling the vacuum pump on/off so that the detected pressure matches the set pressure.

According to a second aspect of the present invention, the storage means is a nonvolatile memory in which the set pressure can be rewritten.

[Function] According to the present invention as set forth in claim 1, the target level of the negative pressure generated in the vacuum blood collection chamber is stored as a set pressure in the storage means, and the actual pressure in the vacuum blood collection chamber is detected by the pressure sensor. Then, the vacuum pump is controlled on/off by the control means as shown in FIG. 7A so that the detected pressure matches the set pressure. As a result, the negative pressure in the vacuum blood collection chamber changes minutely within a constant range of the set pressure, as shown in FIG. 7B, resulting in a constant pressure state.

Therefore, according to the present invention as set forth in claim 1, the vacuum pump does not operate continuously all the time, the electrical efficiency is good, and there is no problem such as heat generation. In addition, even if the seal of the vacuum piping deteriorates over time, the control means will always generate the target negative pressure in the vacuum blood collection chamber by automatically adjusting the ratio of the on-time and off-time of the vacuum pump. It is possible to maintain a stable control state over time.

Further, according to the second aspect of the present invention, the negative pressure of the vacuum blood collection chamber can be easily set by rewriting the data stored in the storage means. At this time,
Since the storage means is nonvolatile, the set pressure is not erased even if the power is turned off due to a power outage or the like, and the same set pressure is maintained repeatedly unless rewritten.

[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 the first
Fig. 5 is a diagram of the vacuum circuit, Fig. 6 is the control block diagram, and Fig. 7 is the on/off control state of the vacuum pump and the pressure state of the vacuum blood collection chamber. It is a line diagram.

The blood sampling device 10, as shown in FIGS. 1 to 4,
A display panel 12 is provided on the front of the housing 11,
A vacuum blood collection chamber 13 is formed inside the housing 11. 14 is the opening/closing lid of the blood collection chamber 13, 15 is the lid 1
Hinge 4 and 16 are sealing rubber for sealing the blood collection chamber 13. 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 communicated with 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) 1 made of polyvinyl chloride or the like. There is. The blood sampling device 10 applies a set negative pressure to the blood bag 1 supported on the bag receiving tray 19 to collect blood while the vacuum blood sampling chamber 13 is depressurized. At this time, the blood collecting device 10 shakes the bag tray 19 to stir the blood and an anticoagulant such as beparin that has been loaded in the blood bag 1 in advance, and also measures the weight of the blood bag 1 to collect the blood. measure quantity.

The structure for swinging the bag receiving tray 19 and the structure for measuring the weight of the blood bag 1 in the blood collecting device 10 are as follows.

First, a pedestal 20 is installed at the bottom of the vacuum blood collection chamber 13, and a swing frame 22 that is rotatable via a support shaft 21 is supported on the pedestal 20.
Further, a swing motor 23 is fixed to the pedestal 20,
and a driving shaft 24 driven by a swing motor 23
is supported. 25 and 26 are toothed pulleys,
27 is a toothed belt. A crank wheel 28 is fixed to one end of the driving shaft 24.
One end of the link 29 is connected to the rotation radius of the
The other end of the link 29 is connected to a connecting piece 30 that is integral with the swing frame 22.

On the other hand, a pair of scale mounting blocks 31 are fixed to the upper surface of the swing frame 22, and both mounting blocks 31
A scale (blood sampling amount measuring means) 33 is supported in a cantilever manner by a support plate 32 that spans the end of the blood sample. The scale 33 is equipped with strain gauges 34 as weight sensors that are attached to two positions on the top surface and two positions on the lower edge to form a Wheatstone bridge circuit, and a weighing platform 35 and a receiving plate 36 are attached to the tip of the scale 33. The above-mentioned bag receiving tray 19 is fixed thereto.
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 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 is supported by the swing frame 22 via the scale 33. This means that the bag receiving tray 19 that is being held in place will be swung. In addition, the blood sampling device 10 has a bag tray 19 supported on a scale 33 that is cantilever-supported via a mounting block 31 and a support plate 32 on the swing frame 22.
The weight of the blood bag 1 is measured by this deflection and deformation of the scale 33, and thus the amount of blood to be collected is measured.

Note that 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 an optical sensor 40.
Under the condition that the bag receiving tray 19 is temporarily stopped at the lowest point (bottom dead center) and held under a constant posture condition, the swing motor 23 is driven and controlled thereby. The weight of the blood bag 1 is measured as described above.

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 with a
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 collection device 10 creates 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 exhaust valve 43 at the end of blood collection to close the vacuum blood collection chamber 1.
3 is released to the atmosphere.

The blood collection device 10 includes a tube holder 44 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 collection bag 1 housed in the vacuum blood collection chamber 13 can be pulled out. The tube holder 44 includes a tube clamp (blood collection stop 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 into the blood bag 1.
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 amount/vacuum degree switching indicator lamp 49, a blood sampling amount/vacuum degree switching switch 50, a 400ml/200ml switching indicator lamp 51,
400ml/200ml changeover switch 52, stop switch 5
3. Start switch 54, usage bug indicator lamp 5
5, a use bag changeover switch 56 and a blood sampling amount/vacuum degree display section 57 are provided. Note that the blood sampling device 10 is
A power switch 58 is located at the lower front of the housing 11.
A fuse holder 59 is provided, and a power connector 60 is provided at the lower rear of the housing 11.

Next, the control device 18 of the blood sampling device 10 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) 65 [including a memory in which a control program for a series of operations of the device 10 is written], a memory (storage means) 66, an input/output control unit 67, an LED ( It has a light emitting diode) drive circuit 68, a buzzer 69, and a failsafe circuit 70. The input/output control unit 67 is configured to transfer detection signals from the aforementioned optical sensor 40 that detects the swinging position of the bag receiving tray 19 and the blood leakage sensor 71 that detects blood leakage from the blood bag 1. It's summery.

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 the negative pressure generated in the vacuum blood collection chamber 13, the set amount of blood to be collected into the blood bag 1, the extended period of swinging of the bag tray 19 after blood collection is completed, and the like.

The buzzer 69 indicates the completion of blood collection, vacuum blood collection chamber 1
Error of negative pressure formed in 3, swing motor 2
3, the detection of blood leakage by the blood leakage sensor 71, etc., the sounds are made in different ways.

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 includes an A/D conversion circuit 72. The A/D conversion circuit 72 includes the aforementioned weight sensor amplification unit 38.
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 a solenoid drive circuit 75 that controls the tube clamp solenoid 45, a solenoid drive circuit 76 that controls the exhaust solenoid 42, a pump drive circuit 78 that turns on/off the power supply switch 77 of the vacuum pump 17, and a swing motor. A motor drive circuit 80 is provided to turn on/off the power supply switch 79 of 23.

The CPU 65 of the 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 vacuum so that the detected pressure matches the set pressure. As described above, the power supply switch 77 of the pump 17 is controlled on/off as shown in FIG. 7A. As a result, the negative pressure in the vacuum blood collection chamber 13 changes minutely within a constant range of the set pressure, as shown in FIG. 7B, resulting in a constant pressure state.

The drive circuit 62 also operates a mode changeover switch 81.
The operating mode of the CPU 65 can be changed as appropriate. The modes set by the mode changeover switch 81 include first blood collection mode, second blood collection mode, blood collection amount setting mode, degree of vacuum setting mode, specific gravity setting mode, rocking extension time setting mode, weight detection calibration mode, There are pressure detection calibration modes, etc.

In the first blood sampling mode, a pre-registered value previously stored in the memory 66 as the empty weight of the blood bag 1 to be used this time is called up, and the amount of blood to be collected is measured using this pre-registered value. The empty weight of the blood bag 1 to be used this time is measured this time, and the amount of blood to be collected is measured using this measured value this time.

In addition, the blood collection amount setting mode is for changing the set blood collection amount, the vacuum level setting mode is for changing the set vacuum level (negative pressure), the specific gravity setting mode is for changing the set blood specific gravity, and the rocking extension. The time setting mode is for changing the set swing extension time. To change these settings, turn on the mode changeover switch 81 to display the current set values on the display section 57, then turn on the stop switch 53 to decrease the set values, and turn on the start switch 54 to increase the set values. The changed data is written into the memory 66 by turning on the changeover switch 50, and completion of writing can be confirmed by the sound of the buzzer 69.

Further, the weight detection calibration mode is for calibrating the detection result of the scale 33, and the pressure detection calibration mode is for calibrating the detection result of the pressure sensor 73.

The display circuit 63 is connected to the main control circuit 61 and includes various indicators such as the display lamp 49 provided on the display pulse 12 and the changeover switch 50 as described above.
It is configured with various switches such as.

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

Turn on the power switch 58.

Select the blood collection mode. The mode changeover switch 81 selects either the first blood collection mode or the second blood collection mode described above.

The amount of blood to be collected is set using the 400ml/200ml changeover switch 52. This selection result is shown in the switching display lamp 5.
1 is displayed.

The bag to be used is selected by the bag to be used switch 56. This selection result is displayed on the display lamp 55.
will be displayed. The types of bags used include single S, which has only a parent bag, double D, triple T, and quadruple Q, which also have one or more small bags.

Procedures for the first blood collection mode A blood collection needle provided at the end of the blood collection tube 2 is inserted into the blood donor, and a certain amount of blood is collected.

Blood bag 1 is placed in vacuum blood collection chamber 13 and placed on bag receiving tray 19, and blood collection tube 2 is set in tube holder 44.

Turn on the start switch 54. CPU65
controls the vacuum pump 17 and the swing motor 23 to collect blood by reducing the pressure in the vacuum blood collection chamber 13,
The bag tray 19 is swung. Also,
The CPU 65 obtains the output of the weight sensor amplification unit 38 at the timing when the bag tray 19 temporarily stops at the lowest point, and detects the measured amount of blood collected from the blood bag 1.
Using the set blood collection volume, blood specific gravity, and pre-registered weight of blood bag 1 written in , the remaining blood collection volume (capacity) is calculated using the following equation (1).

Remaining blood collection volume (ml) = [Setting blood collection volume (g) + Pre-registered weight (g) -
Measured blood collection amount (g)]/Specific gravity (g/ml)... (1) The CPU 65 closes the blood collection tube 2 with the tube clamp 46 on the condition that the remaining blood collection amount, which is the result of the above calculation, has reached zero. Blood sampling operation into blood bag 1 is stopped. At this time, the CPU 65 stops the vacuum pump 17,
And open the exhaust valve 43 to open the vacuum blood collection chamber 13.
released to the atmosphere.

After the blood collection is completed, the CPU 65 extends and drives the swing motor 23 for a certain period of time.
Swing the bag tray 19. Thereafter, the buzzer 69 notifies the end of blood collection.

The clamp release button 47 is turned on, the blood collection tube 2 is removed from the tube holder 44, and the blood bag 1 is taken out from the vacuum blood collection chamber 13.

Procedure for second blood collection mode Blood bag 1 is placed in vacuum blood collection chamber 13 and placed on bag receiving tray 19, and blood collection tube 2 is set in tube holder 44.

A blood collection needle provided at the end of the blood collection tube 2 is inserted into the blood donor.

Turn on the start switch 54. CPU65
obtains the output of the weight sensor amplification unit 38, measures the empty weight of the blood bag 1, and writes this to the memory 66 (or the internal memory of the CPU 65).

Turn on the start switch 54 again. As a result, the CPU 65 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. The CPU 65 obtains the output of the weight sensor amplification unit 38 at the timing when the bag tray 19 temporarily stops at the lowest point, detects the measured blood collection amount of the blood bag 1, and detects the blood collection settings written in the memory 66. Using the amount, blood specific gravity, and currently measured weight of blood bag 1, the remaining blood collection amount (volume) is calculated using the following equation (2).

Remaining blood collection volume (ml) = [Set blood collection volume (g) + current measured weight (g)
- Measured blood collection amount (g)]/Specific gravity (g/ml)...(2) Same as above.

Same as above.

Same as above.

In both cases, the amount of blood to be collected and the degree of vacuum during blood collection can be displayed on the display section 57 to monitor the progress of the measurement. The display amount is selected by the changeover switch 50.

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

According to the above embodiment, the target level of the negative pressure generated in the vacuum blood collection chamber 13 is set as the set pressure in the memory 6.
6, the actual pressure in the vacuum blood collection chamber 13 is detected by the pressure sensor 73, and the CPU 6
5, the vacuum pump 17 is controlled on/off as shown in FIG. 7A so that the detected pressure matches the set pressure. As a result, the negative pressure in the vacuum blood collection chamber 13 changes minutely within a constant range of the set pressure, as shown in FIG. 7B, resulting in a constant pressure state.

Therefore, according to the embodiment described above, the vacuum pump 17 is not constantly operated, the electrical efficiency is good, and there is no problem such as heat generation. In addition, even if the seals of the vacuum piping deteriorate over time, the CPU 65 automatically adjusts the ratio of the on time and off time of the vacuum pump 17 to maintain the target negative pressure in the vacuum blood collection chamber 13.
It is possible to generate a stable control state over time.

Furthermore, according to the embodiment described above, the negative pressure in the vacuum blood collection chamber 13 can be easily set by rewriting the data stored in the memory 66. At this time, since the memory 66 is nonvolatile, the set pressure is not erased even if the power is turned off due to a power outage or the like, and the same set pressure is maintained repeatedly unless rewritten.

[Effects of the Invention] As described above, according to the present invention, when controlling the pressure to generate a constant negative pressure state in the vacuum blood collection chamber, it is possible to improve electrical efficiency and maintain a stable control state over time. can be secured.

Further, according to the present invention, the level of negative pressure generated in the vacuum blood collection chamber can be easily changed.

[Brief explanation of drawings]

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 the first
Fig. 5 is a diagram of the vacuum circuit, Fig. 6 is the control block diagram, and Fig. 7 is the on/off control state of the vacuum pump and the pressure state of the vacuum blood collection chamber. It is a line diagram. 1...Blood bag (blood container), 10...Blood collection device, 13...Vacuum blood collection chamber, 17...Vacuum pump, 65...CPU (control means), 66...Memory (storage means), 73... pressure sensor.

Claims (1)

[Scope of Claims] 1. A vacuum blood collection device that is equipped with a vacuum blood collection chamber that is depressurized by a vacuum pump and in which a blood container is set, and that collects blood into the blood container using negative pressure generated in the vacuum blood collection chamber. A pressure sensor detects the pressure in the blood collection chamber, a storage means stores a set pressure to be generated in the vacuum blood collection chamber, and the detected pressure of the pressure sensor and the set pressure of the storage means are obtained, and the detected pressure is set as the set pressure. 1. A vacuum blood sampling device comprising: a control means for controlling a vacuum pump on/off in accordance with the above. 2. The vacuum blood sampling device according to claim 1, wherein the storage means is a nonvolatile memory in which the set pressure can be rewritten.