JP2754013B2 - Vacuum blood collection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vacuum blood collecting apparatus.

[Prior Art] Conventionally, a blood collecting apparatus as described in JP-B-51-3153 has been proposed. A conventional blood collection device stores a blood bag in a blood collection chamber, detects by a limit switch that the thickness of the blood bag that expands with blood collection reaches a predetermined level, and stops the blood collection operation based on the detection result. As a result, a predetermined volume of blood is collected in the blood bag.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional blood collecting apparatus, since the blood collection amount is measured when the thickness of the blood bag reaches a certain level, the measurement accuracy is poor.

An object of the present invention is to stably improve the accuracy of measuring the amount of blood collected in a blood bag.

Means for Solving the Problems The present invention includes a vacuum blood collection chamber in which a blood container formed of a soft material is set while being depressurized by a vacuum pump, and a negative pressure generated in the vacuum blood collection chamber is reduced. In a vacuum blood collecting apparatus for collecting blood into the blood container while controlling, a switch means for selecting a bag used as the blood container from single, double, triple, and quadruple bags, and the used bag selected by the switch means Display means for displaying the type of blood bag, and the set blood collection amount is calculated based on the type of the used bag selected by the switch means.

[Operation] A blood bag to be used for blood collection can be selected from single, double, triple, and quadruple by the switch means, and the type of the selected blood bag is displayed by the display means, and the selected blood bag is displayed. Since the blood collection amount is calculated according to the type of the measurement, the measurement accuracy of the blood collection amount can be stably improved.

FIG. 1 is a front view showing a blood collecting apparatus according to an embodiment of the present invention, FIG. 2 is a side view showing a main part of FIG.
Fig. 1 is a plan view of Fig. 1, Fig. 4 is a plan view showing a main part of Fig. 1 cut away, Fig. 5 is a vacuum circuit diagram, Fig. 6 is a control block diagram, and Fig. 7 is a scale. FIG. 8 is a side view showing a blood collecting apparatus 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. It is.

As shown in FIGS. 1 to 4, the blood collection apparatus 10 includes a display panel 12 on the front of a housing 11, and forms a vacuum blood collection chamber 13 inside the housing 11. Reference numeral 14 denotes an opening / closing lid of the blood collection chamber 13, reference numeral 15 denotes a hinge of the lid 14, and reference numeral 16 denotes sealing rubber for sealing the blood collection chamber 13. 14A is a handle of the lid 14. Further, the blood collection device 10 has a vacuum pump 17 and a control device 18 built-in below the housing 11.

The vacuum blood collection chamber 13 of the blood collection device 10 is
It is provided with a bag receiving tray 19 which is connected to a blood bag (blood container) 1 made of polyvinyl chloride or the like and is connected to the bag 17A. The blood collection device 10 is a vacuum blood collection room.
Under a reduced pressure of 13, a predetermined negative pressure is applied to the blood bag 1 supported by the bag pan 19 to collect blood. At this time, the blood collection device 10 shakes the bag tray 19 to stir the blood with an anticoagulant such as heparin, which is pre-loaded into the blood bag 1, and measures the weight of the blood bag 1 to collect blood. Measure the amount.

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

First, a gantry 20 is installed at the bottom of the vacuum blood collection chamber 13, and a oscillating frame 22 that is rotatable via a support shaft 21 is supported on the gantry 20. The gantry 20 has a swing motor 23
Is fixed, and is driven by a swing motor 23.
24 are supported. 25 and 26 are toothed pulleys, and 27 is a toothed belt. A crank wheel 28 is fixed to one end of the driving shaft 24, and 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 integrated with the swing frame 22. Are linked.

On the other hand, a pair of scale mounting blocks 31 is fixed to the upper surface of the swing frame 22, and a scale (weight measuring means) 33 is cantilevered on a support plate 32 that is bridged over the ends of the mounting blocks 31. The balance 33 is formed of a substantially rectangular (parallelogram) frame as shown in FIG. The balance 33 is attached to each of two positions on the upper surface and two positions on the lower surface to form a strain gauge 34 as a weight sensor forming a Wheatstone bridge circuit.
The above-mentioned bag tray 19 is fixed to the tip of the scale 33 via a weighing table, 35 and a receiving plate 36. 37 is a stopper for preventing the scale 33 from swaying left and right, and 38 is a weight sensor amplification unit.

That is, the blood collection device 10 rotates the driving shaft 24 and the crankshaft 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. The bag tray 19 is swung. Also,
The blood collection device 10 supports the back tray 19 on a balance 33 that is cantilevered via a mounting block 31 and a support plate 32 on a swing frame 22, and a strain gauge 34 based on the bending deformation of the scale 33. The weight of the blood bag 1 is measured based on the output change, and the blood collection amount is measured.

The blood sampling device 10 detects the rotation position of the detection cam 39 provided at the other end of the driving shaft 24 by the optical sensor 40, thereby controlling the driving of the swing motor 23, and moving the bag tray 19 to the lowest point ( In a state where the blood bag 1 is temporarily stopped at the bottom dead center and held under a certain posture condition as described above,
We are going to measure the weight.

As shown in FIG. 5, the blood collection device 10 connects the suction port 17A of the vacuum pump 17 and the vacuum blood collection chamber 13 with a vacuum pipe 41, and is closed at an intermediate portion of the vacuum pipe 41 by turning on an exhaust solenoid 42. An exhaust valve 43 is opened by gravity when the exhaust solenoid 42 is turned off. The blood collection apparatus 10 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 exhaust valve 43 at the end of blood collection to release the vacuum blood collection chamber 13 to the atmosphere.

The blood collecting apparatus 10 includes a tube holder 44 at a portion adjacent to the vacuum blood collecting chamber 13 at an upper portion on the front side of the housing 11 so that the blood collecting tube 2 connected to the blood bag 1 housed in the vacuum blood collecting chamber 13 can be pulled out. Tube holder
44 includes a tube clamp (blood collection stopping means) 46 driven by a tube clamp solenoid 45. The tube clamp 46 closes the blood collection tube 2 by pressure and stops the blood collection operation to the blood bag 1. 47 is a tube clamp
A clamp release button 46 and a clamp button 48 for operating the tube clamp 46 in an emergency.

The display panel 12 of the blood collection device 10 includes a blood collection amount / vacuum degree changeover display lamp 49, a blood collection amount / vacuum degree changeover switch 50, and 400 ml / 20.
0ml switch display lamp 51, 400ml / 200ml switch 52, stop switch 53, start switch 54, used bag display lamp
55, use bag changeover switch 56, blood collection amount / vacuum level display
With 57. The blood collection device 10 includes a power switch 58 provided on a lower front part of the housing 11 and a fuse holder 59, and a power supply connector 60 provided on a lower rear part of the housing 11.

Next, the control device 18 of the blood collection device 10 will be described. The control device 18 mainly includes a main control circuit 6 as shown in FIG.
1, a drive circuit 62 and a display circuit 63. Here, 64 is a power supply unit.

The main control circuit 61 includes a CPU (central processing unit) [including a memory in which a control program for a series of operations of the device 10 is written] 65, a memory (storage means) 66, an input / output control unit 6
7, LED (light emitting diode) drive circuit 68, buzzer 69,
It has a fail-safe circuit 70. The input / output control unit 67
The optical sensor 40 detects the swinging position of the bag tray 19, and the blood leak sensor 71 detects the blood leak from the blood bag 1.
Are transmitted.

The memory 66 is composed of a nonvolatile memory such as an EA-ROM and an EEP-ROM, and can rewrite and read stored data, and can hold stored data without application of a power supply voltage. The data stored in the memory 66 include the negative pressure generated in the vacuum blood collection chamber 13, the set blood collection amount in the blood bag 1, the extended swing time of the back tray 19 after the blood collection is completed, and the like.

The buzzer 69 completes blood collection, a negative pressure error formed in the vacuum blood collection chamber 13, a rotation error of the swing motor 23,
In response to the detection of blood leakage by the blood leakage sensor 71, the sound is generated with different sound dynamics.

The fail-safe circuit 70 monitors the occurrence of runaway of the CPU 65, and stops the apparatus safely when runaway occurs.

The drive circuit 62 is connected to the main control circuit 61, and the A / D
The conversion circuit 72 is provided. The A / D conversion circuit 72 is connected to the weight sensor amplification unit 38 in which the above-described strain gauge 34 is connected, and a pressure sensor 73 provided in the above-described vacuum pipe 41 and detecting a negative pressure of the vacuum blood collection chamber 13 is provided with a pressure Sensor amplifier circuit 74
Connected via

At this time, the CPU 65 of the control device 18 outputs the output y of the strain gauge 34.
Calculates a blood collection weight assuming that a linear function of y = aw + b is formed with respect to the measured blood collection weight w. Also, the CPU 65
The pressure is calculated assuming that the output z of the pressure sensor 73 forms a linear function of Z = cp + d with respect to the measured pressure p.

The drive circuit 62 includes a tube clamp solenoid.
45, a solenoid drive circuit 76 for controlling the exhaust solenoid 42, a pump drive circuit 78 for turning on / off a power supply switch 77 of the vacuum pump 17, and a power supply switch 79 for the swing motor 23. The motor drive circuit 80 is provided.

Note that 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 that is the data stored in the memory 66, and performs vacuum control so that the detected pressure matches the set pressure. The power supply switch 77 of the pump 17 is turned on / off as described above. As a result, the negative pressure in the vacuum blood collection chamber 13 slightly changes within a certain range of the set pressure, and as a result, a constant pressure state is obtained.

Next, a blood collecting operation procedure by the blood collecting apparatus 10 will be described.

The power switch 58 is turned on.

The blood collection amount is selected by the 400 ml / 200 ml changeover switch 52. This selection result is displayed on the switching display lamp 51.

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

A blood collection needle provided at the end of the blood collection tube 2 is punctured by a blood donor to collect blood to some extent.

The blood bag 1 is placed in the vacuum blood collection chamber 13, placed on the bag pan 19, and the blood collection tube 2 is set in the tube holder 44.

The start switch 54 is turned on. Controller 18 is a vacuum pump
17. The drive of the swing motor 23 is controlled to perform blood collection by decompression of the vacuum blood collection chamber 13 and swing of the bag tray 19. Further, the controller 18 obtains the output of the weight sensor amplifying unit 38 at the timing when the bag pan 19 temporarily stops at the lowest point, detects the measured blood collection amount of the blood bag 1 and
Using the set blood collection amount, the blood specific gravity, and the pre-registered weight of the blood bag 1 written in, the remaining blood collection amount (volume) is subtracted by the following equation (1).

Remaining blood collection volume (ml) = [set blood collection volume (g) + pre-registered weight (g) −measured blood collection volume (g)] / specific gravity (g / ml) (1) The controller 18 calculates the above calculation result. Under the condition that the residual blood collection amount has reached zero, the blood collection tube 2 is closed by the tube clamp 46 and the blood collection operation to the blood bag 1 is stopped. 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 end of the blood collection, the control device 18 drives the swing motor 23 by extending it for a certain period of time, and swings the bag tray 19. Then, the buzzer 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 removed from the vacuum blood collection chamber 13.
Take out from.

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

According to the above embodiment, blood can be collected while the blood bag 1 is rocked by the rocking motor 23, and the blood bag 1 is temporarily stopped at a specific position in the rocking process, and the weight of the blood collected is measured. Therefore, the blood collection amount is measured based on the measurement of the weight change of the blood bag 1, and the measurement accuracy is high. In addition, the blood bag 1 and its bag pan 19
Is stopped at a specific position during weight measurement,
The load state of those loads on the balance 33 is always the same,
A stable measurement of the blood collection weight is ensured. That is, when blood is collected while swinging the blood bag 1, the measurement accuracy of the blood collection amount can be stably improved.

According to the above embodiment, the stop control of the swing motor 23 causes the bag tray 19 to be temporarily stopped at a specific position in the swing process, and the electrical control can easily and gently realize the stop control. At this time, if the blood bag 1 and the bag pan 19 thereof are gradually decelerated and stopped, the impact of the scale 33 on the strain gauge 34 is reduced, and the accuracy of weight measurement can be improved in this respect as well.

8 and 9 are different from the above-described blood collecting apparatus 10 in the structure for swinging the bag receiving tray 101 and the structure for measuring the weight of the blood bag 1. Less than,
The swinging structure and the weight measuring structure of the blood collecting apparatus 100 will be described. In the blood collecting apparatus 100, the same portions as those of the blood collecting apparatus 10 are denoted by the same reference numerals.

First, a scale 102 described below is installed at the bottom of the vacuum blood collection chamber 13, a stopper 103 is mounted on the scale 102, and the bag tray 101 is swingably supported by the stopper 103 via a support shaft 104. I have. At the bottom of the vacuum blood collection chamber 13,
A rocking motor 106 is fixed to the gantry 105, and a cam shaft 107 driven by the rocking motor 106 is supported. 108 and 109 are toothed pulleys, and 110 is a toothed belt. A cam 111 is fixed to the cam shaft 107. That is, the cam 111 is driven by the rocking motor 106, abuts against and lifts the bottom rear surface of the bag tray 101, and makes the bag tray 101 rockable around the support shaft 104.

The stopper 103 described above is installed at an intermediate position of the swingable range of the bag tray 101 determined by the cam 111 as described above, and stops the bag tray 101 during its descending process. 103A is a stationary engagement portion. The balance 102 is formed of a substantially rectangular (parallelogram) frame as shown in FIG.
One light emitting element 113 is provided at the end of the arm 102A extending from one of the two opposite inner surfaces,
On the other surface of the scale 102, two light receiving elements 114A, 1
14B is provided.

Reference numeral 115 denotes a plate cam provided on the output shaft of the swing motor 106 for confirming the original position, and reference numeral 116 denotes an optical sensor operated by the plate cam 115.

That is, in the blood collection device 100, the swing motor 1
06, the bag pan 101 is swung by the lifting action of the rotating cam 111, and the bag pan 101 is temporarily stopped by the stopper 103 in the process of lowering the swing.
A change in the weight of the blood bag 1 supported by 01 is measured by a change in the light receiving ratio (ratio of the amount of received light) between the light receiving elements 114A and 114B based on the bending deformation of the scale 102, and the blood collection amount is measured. Measurement of the blood collection amount based on the outputs of the light receiving elements 114A and 114B,
The control of the blood collection operation is executed by a control device similar to the control device 18 of the blood collection device.

According to the blood collection device 100, the stop of the bag tray 101 can be mechanically and reliably stopped at a specific position in the swinging process by setting the position of the stopper 103.

[Effects of the Invention] As described above, according to the present invention, the type of the selected blood bag is displayed, and the blood collection amount is calculated according to the type of the selected blood bag. It can be stably improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a blood collecting apparatus according to one embodiment of the present invention, FIG. 2 is a side view showing a main part of FIG.
Fig. 1 is a plan view of Fig. 1, Fig. 4 is a plan view showing a main part of Fig. 1 cut away, Fig. 5 is a vacuum circuit diagram, Fig. 6 is a control block diagram, and Fig. 7 is a scale. FIG. 8 is a side view showing a blood collecting apparatus 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. It is. 1 ... blood bag (blood container), 10 ... blood collection device, 19 ... bag tray (container support), 22 ... swing frame (swing table), 23 ... swing motor, 33 ... scale (Weight measuring means), 65: CPU (control means), 100: blood collecting device, 101: bag pan (container support), 102: scale (weight measuring means), 103: stopper, 106: Swing motor, 111… Cam.

Claims (1)

(57) [Claims] 1. A vacuum blood collection chamber, which is decompressed by a vacuum pump and in which a blood container formed of a soft material is set, and controls a negative pressure generated in the vacuum blood collection chamber while controlling the negative pressure. In a vacuum blood collecting apparatus for collecting blood, a switch means for selecting a bag to be used as the blood container from single, double, triple, and quadruple bags, and a display means for displaying a type of the used bag selected by the switch means. A vacuum blood collecting apparatus, comprising: calculating a set blood collection amount based on a type of the used bag selected by the switch means.