JPH03170160A - Fixed rate blood taking device - Google Patents

Abstract

PURPOSE:To automatically and exactly draw a prescribed amt. of blood from a blood donor by providing an oscillating means, a means for detecting a blood taking amt., and a holding means for holding a part of a blood taking tube in a casing. CONSTITUTION:A receiving base 21 imposed with a blood bag body 2 is coupled via a load cell 17 to an oscillating base 11 and since an eccentric cam 20 is freely fitted to a cam receiving part 18, the oscillating base 11 moves back and forth around a horizontal shaft 8 supported by a supporting bracket 9 when a motor is kept energized during the period of the blood taking operation. A tube 3 is held in a hollow groove 23 of a cap plate 22 and the top end of a casing 5 and the part of the tube 3 extending to the outside of the casing 5 is held static. The distortion of the load cell 17 increases when the weight of the blood ted into the body 2 of the blood bag increases and, therefore, the weight of the blood fed into the body 2 is determined by the signal transmitted from this load cell 17.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a quantitative blood collection device that is installed in a hospital blood center or a mobile blood collection vehicle and used when collecting a certain amount of blood from a blood donor. It's Chino.

[Prior Art] Blood is often required for various treatments, such as for blood transfusions, and such blood is often obtained from hospital blood centers or blood donations on the street.

When blood is collected, a blood collection bag 1 as shown in FIG. 6 is used, and blood is collected from each blood donor into a separate blood bag.

This blood bag 1 includes a main body 2 made into a bag shape from a flexible material 4 such as vinyl chloride, a flexible tube 3 whose proximal end is passed through the main body 2, and a flexible tube 3 whose base end is connected to the main body 2. It consists of a blood collection needle 4 in the form of an injection needle provided at its tip.

The main body 2 is filled with a blood anticoagulant in advance.
The collected blood is prevented from coagulating within the main body 2 before use.

When blood is collected using such a blood bag 1, the blood collection needle 4 at the tip of the tube 3 is punctured into the blood donor's blood vessel, and the blood is pumped into the main body 2 through the tube 3 according to the blood donor's own blood pressure. is normally done.

The amount of blood collected is within 200 cc or 400 cc, which is determined by the donor's wishes, and a blood bag is used accordingly. The error in the amount of blood collected is within +lO% (
(There is no tolerance value on the shortage side.) Therefore, in order to collect blood accurately, workers are currently required to accompany them all the time to collect blood.

[Problems to be Solved by the Invention] However, when collecting a predetermined amount of blood according to the donor's own blood pressure as described above, it takes 5 to 10 minutes (
(There are considerable differences depending on the blood donor's blood and the thickness of the blood vessels.)
A worker must be present throughout the process, which inevitably makes the blood collection work inefficient.

Japanese Utility Model Publication No. 51-3153 discloses that by storing the body of a blood bag in a chamber containing a fixed amount of blood and making the chamber negative and positive, a fixed amount of blood can be stored inside the main body of the blood bag even if the operator is not present. A blood sampling device that can quickly and reliably collect blood has been disclosed. However, this device was not always suitable for use, as it was troublesome to change the amount of blood to be collected, and it was difficult to confirm the amount of blood to be collected during blood collection.

Blood sampling devices that detect the amount of blood collected based on weight rather than volume have been considered for some time, but conventional weight-detecting quantitative blood sampling devices apply the principle of a scale using a tension spring, resulting in poor measurement accuracy. In particular, when blood is collected while shaking the body of the blood bag in order to mix the anticoagulant filled in the body of the blood bag with the blood pumped into the body, reliable measurement cannot be performed.

Furthermore, in the device disclosed in the above-mentioned Japanese Patent Publication No. 51-3153, the blood bag storage section (box) and the swing mechanism storage section are separate, so that the blood bag storage section swings independently. Because of this, the blood collection tube connected to the donor's arm swings a lot during blood collection, and in extreme cases, there is a risk that the blood collection needle may come off the donor's arm, which puts a mental burden on both the donor and the nurse. was forced. Additionally, there was a risk that a worker such as a nurse might get his/her hand caught between the blood bag storage section and the swing mechanism storage section.

An object of the invention is to provide a device that can automatically and accurately collect a predetermined amount of blood from a donor.

Another object of the present invention is to suppress the swinging of the blood collection tube connected to the blood bag when blood is collected while swinging the blood bag, and furthermore, to ensure safety and avoid mental anxiety for blood donors. It is an object of the present invention to provide a quantitative blood sampling device that is unlike any other.

[Means for Solving the Problems] Means of the present invention for solving the above problems is an apparatus for collecting a predetermined amount of blood, which comprises: a pedestal on which a blood bag is placed; A swinging means for swinging, a detection means for detecting the amount of blood collected in the blood bag placed on the pedestal, and a vacuum structure that houses the pedestal, the swinging means, and the measuring means. A casing having a storage space, a holding means for holding a part of a blood collection tube connected to the blood bag in the casing, and a blood collection stop means for stopping blood collection when a predetermined amount of blood has been collected into the blood bag. It is equipped with the following.

[Operation] A blood bag is placed on a pedestal, and while the inside of the casing is evacuated, blood is introduced into the blood bag while the pedestal is rocked by a swinging means, and the amount of blood to be collected is measured by a blood sampling amount measuring means. Measure. Since the blood collection tube connected to the blood bag is held by the casing, the tube does not swing following the swinging means.

[Example] Next, an example of the present invention will be described based on FIGS. 1 to 5.

This casing 5 is contained in the casing 5 of the quantitative blood sampling device.
A storage space 6 is provided which is open on the top surface. A recess 7 is provided at the bottom of the storage space 6, and a mechanism for swinging the pedestal 2l on which the main body of the blood bag is placed and the weight of the blood collected in the blood bag are installed in the recess 7. A mechanism is provided to detect this.

That is, in the recess 7, there is a horizontal shaft 8 as shown in FIG.
A support bracket 9 having one end fixed thereto is fixed to a fixing bracket 10 fixed to the bottom surface of the recess 7. A rocking table 1l as shown in FIG. 5 is pivotally supported on the horizontal shaft 8. This rocking table 1l has a pair of hanging arms 12.12 integrally formed above both sides of the main part 14, and these hanging arms 1
2 and 12 at mutually aligned positions, the horizontal shafts 8
Circular holes 13, 13 are bored through which the holder is rotatably inserted.

On the upper surface of one end of the main part (4) is a support part 15 which is higher than the other parts, and through holes 16, 16 for inserting the screws for fixing the load cell 17 are bored in this support part 15. ing.

A bifurcated cam receiving portion l8 is formed below one of the pair of hanging arms 12.12. An eccentric cam 20 is loosely fitted inside this cam receiving portion l8. This eccentric cam 20 is fixed to an output shaft 19 of a motor (not shown) that protrudes from a circular hole 34 of the bracket 9. Note that the mork 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 rocking table l1 swings back and forth about the horizontal shaft 8.

The load cell 17, which measures the amount of blood sent into the main body 2 of the blood bag, had the lower surface of one end in contact with the upper surface of the support portion l5 of the rocking table 11, and was inserted through the through holes 16, 16 from below. It is fixed to the rocking table 11 with screws.

Furthermore, a pedestal 21 on which the main body 2 of the blood bag I is placed is fixed to the upper surface of the other end of the load cell 17.

In addition, in FIG. 2, 40 and 40a are screws for adjusting strain of the load cell.

A storage space 6 for a pedestal 21 on which the main body 2 of the blood bag as described above is placed, a side of the machine for swinging this pedestal, and a space 6 for the main body 2.
The recess 7 provided with a mechanism for detecting the weight of blood collected therein constitutes a continuous integral space as shown in FIG. Then, the air in the recess 7 and the storage space 6 can be freely discharged by communicating with the suction port 42 of the vacuum bomb P provided in the casing 5 through a tube (not shown) or the like, so that the space can be maintained in a vacuum state. It has become. A packing is provided around the upper opening of the storage space 6 so that when the cover plate 22 made of acrylic resin is closed, the inside and outside of the storage space 6 and the recess 7 can be kept airtight. Reference numeral 23 denotes a concave groove constituting a holding means for the blood collection tube 3, and is provided at one edge of the lower surface of the lid plate 22 at a position aligned with a blood collection stopping means to be described later. When the cover plate 22 is closed, the tube 3 is guided out of the casing 5 through the groove 23, and the tube 3
is sandwiched and fixed to the upper edge of the casing 5.

The signal from the load cell 17 is input to a controller (not shown) that determines the amount of blood in the main body 2 of the blood bag 1, and based on the amount of blood in the main body 2 determined by this controller, the vacuum bomb is stopped. , the blood collection stop means is activated.

As shown by the solid line in FIG. 3, the blood collection stop means is configured to crush the middle of the tube 3 of the blood bag 1 when activated, thereby cutting off the supply of blood to the main body 2 through the tube 3. .

In FIG. 3, 24 is a receiver for the tube 3;
It has a U-shaped notch that allows the tube 3 to be inserted without crushing it. Reference numeral 25 denotes a holding piece that crushes the middle of the tube 3 by rotating about a shaft 26 when the blood collection stop means is activated. This holding piece 25 is given elasticity by a spring (tension spring, helical spring) (not shown) to rotate clockwise in FIG. The inserted tube 3 can be crushed. Further, the intermediate portion of a support lever 27 is fixed to the intermediate portion of the holding piece 25. At the tip of the support lever 27, there is provided an L-shaped rotation blocking piece 29 that rotates about a shaft 28. This rotation prevention piece 29 is given elasticity by a spring (not shown) to rotate clockwise in FIG. It is configured to rotate counterclockwise in FIG.

In addition, in Fig. 1, 30 indicates the amount of blood to be collected as 200cc and 4
The switching button 31 is an indicator light consisting of 5 light emitting diodes for switching between 00cc and 00cc.
One light emitting diode lights up each time 0% blood is collected, and all light emitting diodes light up when blood collection is completed. Further, 32 is a dial for adjusting the opening degree of the throttle valve communicating with the storage space 6, which freely adjusts the negative pressure in the storage space 6 while monitoring the pressure gauge 33 during vacuum bomb operation, and controls the blood sampling speed. Allows adjustments to be made.

When performing blood sampling using the quantitative blood sampling device of the present invention configured as described above, the lid plate 22 is opened, the main body 2 of the blood bag 1 is placed on the top surface of the pedestal 21, and the tube 3 leading to the main body 2 is This tube is passed through the U-shaped notch of the receiver 24 that constitutes the blood collection stopping means (at this time, the outer end of the casing of the support lever 27 is pushed down and the holding piece 25 is in the state shown by the imaginary line in FIG. 3). A blood sampling needle 4 provided at the tip of 3 is punctured into the blood donor's blood vessel.

In this state, blood is pumped into the main body 2 of the blood bag 1 by the blood donor's own blood pressure. However, if it is necessary to quickly collect blood and the blood donor's blood vessels are sufficiently thick that it is safe to collect blood immediately, close the lid plate 22 on the top of the casing 5 and operate the vacuum pump. Then, the inside of the storage space 6 that accommodates the main body 2 of the blood bag 1 is made negative pressure. In this case, the tube 3 is connected to the lid plate 22
Since the air is led out to the outside through the groove 23 formed at the corner of the lower surface of the vacuum bomb, the amount of air sucked into the storage space through the take-out portion of the tube 3 during operation of the vacuum bomb can be extremely small. In this way, when the inside of the accommodation space 6 that accommodates the main body 2 of the blood bag 1 is under negative pressure, due to the differential pressure between the blood pressure and the negative pressure,
Since blood is sent through the tube 3, the amount of blood collected per unit time is greater than when only blood pressure is used, and blood collection can be performed quickly.

When blood is fed into the main body 2 of the blood bag 1 in this manner, the motor fixed to the support bracket 9 is energized, and the eccentric cam 20 fixed to the output shaft 19 of this motor continues to rotate.

A pedestal 21 on which the main body 2 of the blood bag 1 is placed is connected to the rocking table 11 via a load cell 17, and the eccentric cam 20 is connected to a cam receiver formed on the lower side of the rocking table 11. Since the rocking table 1l is loosely connected to the support bracket 9, if the motor is kept energized during the blood sampling operation,
It reciprocates around a horizontal axis 8 supported by
The anti-coagulant contained in the container mixes well, preventing the sampled blood from coagulating. While the pedestal 21 is swinging, the tube 3 is held by the groove 23 of the cover plate 22 and the upper end of the casing 5, so the portion of the tube 3 extending outside the casing 5 remains stationary, and the pedestal 21 remains stationary. stand 21
The entire tube 3 does not swing following the swing of.

By performing the blood collection operation in this way, when the weight of the blood sent into the main body 2 of the blood bag 1 increases,
Since the strain on the load cell 17 that connects the pedestal 21 to the rocking table 1l becomes large, the weight of the blood sent into the main body 2 can be determined by the signal sent from the load cell 17. The specific gravity of the donor's blood is measured before blood collection begins, and blood is collected only if the specific gravity is within a certain range, so even when determining the amount of blood to be collected by weight measurement, it is well within the acceptable range. What can be paid is as mentioned above.

The attitude of the load cell 17 changes as the rocking table 11 is captured, and the acceleration associated with the rocking is also applied to the load cell l7, so the weight detected by the load cell l7 is slightly different from the actual blood volume. Incidentally, the blood volume can also be measured intermittently by extracting the signal from this port cell 17 every moment the load cell 17 is in the same posture. The rocking cycle of the 1L rocking table is 2 to 3 seconds, which is much shorter than the time required to collect blood, so even when measuring blood volume intermittently, measurement results can be obtained with sufficient practical measurement accuracy. .

As the amount of blood collected into the main body 2 increases, the casing 5
A light emitting diode constituting an indicator light 31 provided on the front side of the device lights up, allowing the amount of blood to be collected to be visually confirmed. Furthermore, by incorporating a voice IC into the controller, the amount of blood to be collected (and furthermore, the end of blood collection) can be notified by voice.

The amount of blood sent into the main body 2 of the blood bag 1 is a predetermined amount (200 cc or 400 cc)
When the amount of blood is reached, the controller sends a signal to the blood collection stop means to stop blood collection based on the signal from the load cell 17. Based on this signal, the solenoid constituting the blood sampling stop means is activated to rotate the rotation blocking piece 29 counterclockwise in FIG. 3.

As the rotation prevention piece 29 rotates counterclockwise, the holding piece 25, which had been prevented from rotating counterclockwise by the rotation prevention piece 29, rotates counterclockwise in FIG. Then, the tube 3, which is passed through the notch of the receiver 24 and leads to the main body of the blood bag 1, is crushed. As a result, the internal measurement passage of the tube 3 is blocked, and blood is no longer sent into the main body 2. When the vacuum bomb P is operated to create a negative pressure in the storage space 6 surrounding the main body when blood sampling is performed, the vacuum bomb P is stopped at the same time as the blood sampling stop means is activated, and the solenoid valve 41 is opened to The storage space 6 and the recess 7 are communicated with the atmosphere.

The quantitative blood sampling device of the present invention detects the amount of blood collected by weight, so by appropriately setting the program of the controller, it is possible to estimate the end time of blood sampling based on the increase in weight per unit time. If the specified weight is not reached (or even if the weight does not increase at all),
It will now be possible for children to stop blood collection after determining that the device is malfunctioning.

[Effects of the Invention] According to the quantitative blood sampling device of the present invention as described above, a predetermined amount of blood can be automatically collected, so there is no need for nurses etc. Work efficiency improves.

Further, according to the present invention, since the blood collection tube connected to the blood bag does not swing following the swinging means, there is no fear that the blood collection needle will fall out of the donor's arm, resulting in safety. Furthermore, since the rocking mechanism is located inside the casing, the rocking state cannot be visually seen from the outside, reducing the mental burden on the donor.Furthermore, the rocking mechanism is not exposed to the outside, improving operational safety. .

Furthermore, since the swing motor and the like are driven in a vacuum chamber, the load is reduced and the entire apparatus can be made more compact.

[Brief explanation of the drawing]

Fig. 2 is a perspective view showing the overall configuration of the quantitative blood sampling device of the present invention, Fig. 2 is a vertical cross-sectional view of the part that swings the pedestal and detects the weight, and Fig. 3 is a front view of the blood sampling stop means part. 4 is a perspective view of the bracket supporting the horizontal shaft, FIG. 5 is a perspective view of the rocking table, and FIG. 6 is a perspective view of the blood bag.

Claims (1)

[Scope of Claims] An apparatus for collecting a predetermined amount of blood, comprising: a pedestal on which a blood bag is placed; a rocking means for rocking the pedestal; a detection means for detecting the amount of blood collected into the blood bag; a casing having an integral storage space with a vacuum structure for housing the pedestal, the swinging means, and the measuring means; and a blood collection tube connected to the blood bag. A quantitative blood sampling device comprising: holding means for holding the blood sample in the casing; and blood sampling stopping means for stopping blood sampling when a predetermined amount of blood has been sampled into the blood bag.