JP2547672B2 - Quantitative blood sampling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quantitative blood sampling device which is installed in a blood center of a hospital or a mobile blood collection vehicle and used when a predetermined amount of blood is collected from a blood donor.

[0002]

2. Description of the Related Art Blood is often required for various treatments such as for blood transfusion, but such blood is often obtained by donating blood at a blood center of a hospital or on the street.

When donating blood, a blood bag 1 as shown in FIG. 7 is used, and blood is collected in separate blood bags for each blood donor.

The blood bag 1 is composed of a bag-like main body 2 made of a flexible material such as vinyl chloride, a flexible tube 3 having the base end portion passed through the main body 2, and a flexible tube 3. It is composed of an injection needle-shaped blood collection needle 4 provided at the tip of the tube 3. An anticoagulant for blood is previously filled in the main body 2 so that the collected blood does not coagulate in the main body 2 before use.

When collecting blood using such a blood bag 1, the blood collecting needle 4 at the tip of the tube 3 is punctured into the blood vessel of the blood donor, and the blood pressure of the blood collecting person himself is used to insert the blood into the main body 2. The work of pumping blood is usually performed.

The amount of blood collected is within 200 cc or 400 cc, which is determined by the donor's request, and a blood bag is used accordingly. Since the error in the amount of collected blood is set within + 10% (there is no allowable value on the insufficient side), the current situation is that the worker performs the blood collection work thoroughly in order to perform accurate blood collection. .

For this reason, for example, in Japanese Utility Model Publication No. 51-3153, the main body of the blood bag is housed in a fixed amount storage chamber and the inside of the storage chamber is set to a negative pressure, so that the blood bag A blood sampling device capable of quickly and reliably collecting a fixed amount of blood in the body is disclosed. However, this device stores the blood bag in the storage chamber, and when the blood bag is inflated by blood collection, the switches provided above and below the storage chamber are activated to automatically stop the blood collection. Since it is detected from the bulge of the blood bag whether or not the blood collection amount is reached, the blood collection amount varies depending on the size and material (hard and soft) of the blood bag.

Further, this device has a problem that it is not possible to perform blood collection suitable for a blood sampler, because blood is collected while keeping a negative pressure in the blood bag storage chamber. That is, since the blood donors have various blood vessel thicknesses, and the blood flow rate varies depending on the blood vessel thickness, when the blood bag storage chamber is kept at a certain negative pressure, the blood flow rate is extremely fast when the blood vessel is thick. Or, when the blood vessel is thin, the needle tip of the blood sampling needle may suck the inner wall of the blood vessel to make it impossible to collect blood.

[0009]

According to the present invention, when a blood bag is stored in a storage chamber and the storage chamber is evacuated to collect blood in the blood bag, the blood collection rate can be adjusted according to the person collecting the blood. In addition, it is an object of the present invention to provide a quantitative blood sampling device capable of accurately measuring the blood sampling amount and reliably stopping the blood sampling when a predetermined amount is reached.

[0010]

[Means for Solving the Problems ] To solve the above problems
The means of the present invention stores a blood bag in a storage chamber,
The storage chamber is evacuated to a predetermined amount in the blood bag.
In the quantitative blood sampling device for collecting blood, the blood bag
Detects the amount of blood collected in the blood bag by means of swinging the
However, the amount of blood collected should be changed at each moment when the detecting means is in the same posture.
Adjusting the negative pressure inside the storage chamber with means for intermittent measurement
And a means for adjusting the blood collection rate and a place inside the blood bag.
When a fixed amount of blood is collected,
Blood collection stopping means which is operated by the signal of .

[0011]

According to the above-mentioned means of the present invention, the blood bag is
When detecting the amount of blood collected while rocking, store in a blood bag
By adjusting the negative pressure in the chamber, the blood bag is connected.
Adjust the suction force of the blood collection needle connected to the tube to collect blood.
By adjusting the speed and outputting a signal when the blood sampling amount detecting means is in a predetermined posture, and measuring the blood sampling amount intermittently, the accurate blood sampling amount is constantly measured under constant conditions, and the predetermined amount of blood is collected. At that time, the blood collection stopping means can be activated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
It will be explained based on. Inside the casing 5 of the quantitative blood sampling apparatus, a storage space 6 is provided which opens to the upper surface of the casing 5. A recess 7 is provided on the bottom surface of the storage space 6, and a mechanism for swinging the pedestal 21 on which the main body of the blood collection container is placed and the weight of the blood collected in the blood bag are provided in the recess 7. A mechanism for detecting

That is, as shown in FIG. 5, a support bracket 9 having one end of a horizontal shaft 8 fixed thereto is fixed to a fixed bracket 10 fixed to the bottom surface of the recess 7 in the recess 7. The horizontal shaft 8 has a rocking table 11 as shown in FIG.
Is pivotally supported. The swing base 11 has a pair of suspending arms 12 and 12 integrally formed on both upper sides of a main portion 14, and the horizontal shaft 8 is rotated to a position where the suspending arms 12 and 12 are aligned with each other. Circular holes 13 and 13 that are freely inserted are formed. The upper surface of one end of the main portion 14 has a supporting base 15 higher than the other portions, and the supporting base 15 is provided with through holes 16 for inserting a screw for fixing the load cell 17. are doing.

Below the one hanging arm 12 of the pair of hanging arms 12, a bifurcated cam receiving portion 18 is formed. An eccentric cam 20 is loosely fitted inside the cam receiving portion 18. The eccentric cam 20 is fixed to the output shaft 19 of a motor (not shown) protruding from the circular hole 34 of the bracket 9. The motor is supported and fixed to the bracket 9. Therefore, when the eccentric cam 20 is rotated about the output shaft 19 by energizing the motor, the swing base 11 reciprocally swings about the horizontal shaft 8.

A load cell 17 for measuring the amount of blood sent into the body 2 of the blood collection bag has one end lower surface abutted on the upper surface of the support base portion 15 of the rocking base 11 so that the through holes 16, 16 are formed.
It is fixed to the rocking base 11 by a screw that is inserted from below. A pedestal 21 on which the main body 2 of the blood sampling bag 1 is placed is fixed to the upper surface of the other end of the load cell 17. In FIG. 2, 40 and 40a are low.
This is a screw for adjusting the distortion of the dosel.

The storage space 6 of the pedestal 21 on which the main body 2 of the blood bag as described above is mounted, the mechanism for swinging the pedestal, and the mechanism for detecting the weight of the blood collected in the main body 2. The provided recess 7 constitutes a continuous integral space as shown in FIG. Then, through a tube (not shown) or the like, the air is introduced into the suction port 42 of the vacuum pump P provided in the casing 5 so that the air in the recess 7 and the storage space 6 can be discharged freely. Can be maintained at. It should be noted that a packing is provided at the upper end opening peripheral portion of the storage space 6 so that the inside and outside of the storage space 6 and the recess 7 can be kept airtight when the lid plate 22 made of acrylic is closed.

Reference numeral 23 is a concave groove which constitutes a holding means for the blood collecting tube 3, and is provided at a position at one end edge of the lower surface of the cover plate 22 so as to align with blood collecting stopping means which will be described later. When the cover plate 22 is closed, the tube 3 is led out of the casing 5 through the groove 23, and the tube 3 is closed.
It is fixed by sandwiching it on the upper edge of the single 5.

The signal from the load cell 17 is used as a controller 50 for obtaining the amount of blood in the body 2 of the blood bag 1 as shown in FIG.
Based on the blood volume in the main body 2 obtained by the controller 50, the vacuum pump P is stopped and the blood collection stopping means 51 is started.

That is, the output signal from the load cell 17 is input to the controller 50 via the amplifier. In the controller 50, each time the load cell 17 is in the same posture, for example, the posture in which the load cell 17 is in the horizontal state (at this time, the rocking table 11 is also in the horizontal state) is mechanical, The load cell 1 is detected electrically or optically and is synchronized with this.
A signal is output from 7 and the blood sampling amount is intermittently measured by an arithmetic circuit. When the amount of collected blood reaches the set amount (200 cc or 400 cc), the controller 50 causes the blood collection stopping means 5 to stop.
An actuation signal is sent to the solenoid 41 forming the solenoid 1 and the solenoid 41 for communicating the storage space with the atmosphere. The swing cycle of the swing base 11 is 2 to 3 seconds in this embodiment.

As shown by the solid line in FIG. 4, the blood collection stopping means 51 crushes the tube 3 of the blood collection bag 1 during operation and supplies blood to the main body 2 through the tube 3. Is configured as follows.

In FIG. 4, reference numeral 24 denotes a receiving member for the tube 3, which has a U-shaped notch that can be inserted without crushing the tube 3. When the blood collection stopping means 51 is activated, the reference numeral 25 is rotated about the shaft 26 so that the above-mentioned tu
It is a restraining piece that squeezes the middle of the bump 3. This restraining piece 25 is provided with an elastic force to rotate clockwise in FIG. 4 by a spring (tensile spring, spiral spring) not shown,
The tube 3 inserted into the notch of the receiving member 24 can be crushed when it is rotated by a spring.

Further, the intermediate portion of the support lever 27 is fixed to the intermediate portion of the pressing piece 25. This support lever-2
At the tip position of 7, there is provided a rotation blocking piece 29 which is L-shaped and rotates around the shaft 28. This rotation blocking piece 29
4 is given an elastic force to rotate clockwise in FIG. 4 by a spring (not shown), and is also counterclockwise in FIG. 4 against the elastic force of the spring only when energized by a solenoid (not shown). It is configured to rotate.

In FIG. 1, reference numeral 30 denotes a blood collection amount of 20.
Switch button for switching between 0cc and 400cc, 31 is 5
It is an indicator light consisting of one light emitting diode, and one light emitting diode lights up each time 20% of the required amount of blood is collected, and all light emitting diodes are turned on when blood collection is completed. Acts to light up.

Reference numeral 32 is a dial for adjusting the opening of a throttle valve which communicates with the storage space 6, and freely adjusts the negative pressure in the storage space 6 during operation of the vacuum pump P while monitoring the pressure gauge 33. , The blood collection speed can be adjusted. This blood collection rate is, in other words, the rate of increase in blood introduced into the blood bag body 2. Therefore, if necessary, the controller 50 can calculate the blood increase rate and adjust the throttle valve of the vacuum pump P so as to obtain a predetermined increase rate.

When collecting blood by the quantitative blood collecting apparatus of the present invention having the above-described structure, the lid plate 22 is opened and the main body 2 of the blood bag 1 is placed on the upper surface of the pedestal 21.
Through the U-shaped notch of the receiving member 24 that constitutes the blood sampling stopping means 51 (at this time, the support lever 27).
The outer side end portion of the casing is pushed down to keep the restraining piece 25 in the state shown by the phantom line in FIG. 4), and the blood collecting needle 4 provided at the tip of the tube 3 is punctured into the blood vessel of the blood donor.

After that, when the lid plate 22 on the upper part of the casing 5 is closed and the blood sampling start switch is pushed, the previous blood sampling amount measurement value is automatically initialized, and then the vacuum pump P is activated to start the blood sampling bag. The accommodating space 6 accommodating the main body 2 and the concave portion 7 are adjusted to a predetermined negative pressure.

In this case, the tube 3 has a cover plate 22.
Since it is led out to the outside through the recessed groove 23 formed in the lower corner of the, the amount of air sucked into the storage space through the take-out portion of the tube 3 during operation of the vacuum pump P is very small. When the accommodation space 6 accommodating the main body 2 of the blood bag 1 has a negative pressure, blood is sent through the tube 3 due to the differential pressure between the blood pressure and the negative pressure. Compared with the case of using only blood pressure, the blood pressure will increase and quick blood collection work can be performed.

When blood is sent into the body 2 of the blood bag 1, the motor fixed to the support bracket 9 is energized and the eccentric cam 20 fixed to the output shaft 19 of this motor is kept rotating. That is, the pedestal 21 on which the main body 2 of the blood bag 1 is placed is connected to the oscillating base 11 via the load cell 17, and the eccentric cam 20 is provided below the oscillating base 11. Since it is loosely engaged with the formed cam receiving portion 18, if the motor continues to be energized during the blood collecting operation, the rocking base 11 reciprocates about the horizontal shaft 8 supported by the support bracket 9. Then, the blood sent into the main body 2 of the blood collection bag 1 and the anticoagulant previously filled in the main body 2 are mixed well, and the blood collected can be prevented from coagulating.

While the receiving table 21 swings, the tube 3 is held by the concave groove 23 of the cover plate 22 and the upper end of the casing 5, so that the casing 5 of the tube 3 can be held. The portion extended to the outside is in a stationary state, and the entire tube 3 does not swing following the swing of the pedestal 21.

When the weight of the blood sent into the main body 2 of the blood bag 1 is increased by performing the blood collection work in this way, the load cell 17 connecting the pedestal 21 to the rocking pedestal 11 is connected. Since the distortion becomes large, this load cell 1
The weight of the blood sent into the main body 2 can be obtained from the signal sent from 7. The specific gravity of the blood of the donor is measured before starting the blood collection work, and blood is collected only when the specific gravity is within a certain range.Therefore, even when determining the blood collection volume by weight measurement, it is well within the allowable range. What can be paid is as described above.

The attitude of the load cell 17 changes as the rocking base 11 rocks, and the acceleration accompanying the rocking also affects the load cell 1.
7, the weight detected by the load cell 17 is slightly different from the actual blood volume, but since this difference is very small, it need not be particularly considered. However, each time the load cell 17 is in the same posture, this load cell 17
As described above, the signal of is taken out and the blood volume is intermittently measured.

As the amount of blood collected in the main body 2 increases,
The light-emitting diode that constitutes the indicator lamp 31 provided on the front surface of the casing 5 is turned on, and the blood collection amount can be visually confirmed. Further, by incorporating a voice IC 52 in the controller 50, it is possible to give a voice notification of the amount of collected blood (and further, the end of blood collection).

The amount of blood sent into the body 2 of the blood bag 1 is a predetermined amount (200cc or 400c).
When the condition (c) is reached, the controller 50 sends a signal to the blood collection stopping means 51 based on the signal from the load cell 17 to stop blood collection. Based on this signal, the blood collection stopping means 5
The solenoid constituting 1 is activated, and the rotation blocking piece 29 is rotated counterclockwise in FIG.

When the rotation blocking piece 29 rotates counterclockwise, the pressing piece 25, which has been prevented from rotating counterclockwise by the rotation blocking piece 29, moves counterclockwise in FIG. The tube 3 is rotated, passed through the notch of the receiving member 24, and the tube 3 leading to the main body of the blood bag 1 is crushed. As a result, the inner passage of the tube 3 is blocked, and blood is no longer fed into the main body 2. Simultaneously with the activation of the blood collection stopping means 51, the vacuum pump P is stopped by a signal from the controller 50, the electromagnetic valve 41 is opened, and the storage space 6 and the recess 7 are communicated with the atmosphere.

Since the quantitative blood sampling apparatus of the present invention detects the blood sampling amount by weight, it is possible to estimate the end time of blood sampling operation by increasing the weight per unit time by appropriately setting the program of the controller 50. If the predetermined weight is not reached within the time (or if the weight does not increase at all), it is possible to judge that the device is out of order and stop the blood collection.

[0036]

According to the quantitative blood sampling apparatus of the present invention described above, when a blood bag is stored in the storage chamber and the storage chamber is evacuated to collect blood in the blood bag, a negative pressure in the storage chamber is obtained. The blood collection rate can be adjusted according to the person who collected the blood. In addition, it is possible to accurately measure the blood sampling amount and reliably stop the blood sampling when a predetermined amount is reached.

[0037]

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of a quantitative blood sampling device of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

FIG. 3 is a block diagram for explaining the operation of the present invention.

FIG. 4 is a partial front view of a blood sampling stopping means that constitutes an embodiment of the present invention.

FIG. 5 is a perspective view of a bracket which constitutes an embodiment of the present invention.

FIG. 6 is a perspective view of a rocking base that constitutes an embodiment of the present invention.

FIG. 7 is a perspective view of a general blood bag.

[Explanation of symbols]

 1 Blood Bag 2 Main Body 3 Tube 4 Blood Collection Needle 5 Case 6 Storage Space 7 Recess 8 Horizontal Axis 9 Support Bracket 10 Fixed Bracket 11 Swing Platform 12 Suspended Arm 13 Circular Hole 14 Main Part 15 Support Stand 16 Through Hole 17 Load cell 18 Cam receiving portion 19 Output shaft 20 Eccentric cam 21 Cradle 22 Cover plate 23 Recessed groove 24 Receiving tool 25 Suppressing piece 26 Shaft 27 Support lever 28 Shaft 29 Rotation blocking piece 30 Notch button 31 Indicator light 32 Dial 33 Pressure gauge 34 Circular hole

Claims (1)

(57) [Claims] 1. A blood bag is stored in a storage chamber and the storage is performed.
The chamber is evacuated and a predetermined amount of blood is placed in the blood bag.
In the quantitative blood collecting device for collecting the blood bag, the means for swinging the blood bag and the blood sampling amount in the blood bag are detected, and the detection means is the same.
Means for intermittently measuring the amount of blood collected at each moment of posture
And a hand that adjusts the negative pressure in the storage chamber to adjust the blood sampling rate.
Step and when a predetermined amount of blood is collected in the blood bag
Blood sampling stop hand operated by a signal from the blood sampling amount measuring means.
A quantitative blood sampling device having a step .