JPH0558149U - Vacuum blood sampling device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to promptly detect blood leakage from a blood container. A vacuum blood sampling apparatus of the present invention is provided with a vacuum blood sampling chamber 13 in which a blood container 1 made of a soft material is set and which is decompressed by a vacuum pump 17, and a negative pressure generated in the vacuum blood sampling chamber 13. Thus, the vacuum blood sampling apparatus 10 for collecting blood in the blood container 1 includes a blood leakage sensor 71 for detecting blood leakage from the blood container 1.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a vacuum blood collection device for collecting blood in a blood container.

[0002]

[Prior Art]

 Conventionally, a vacuum blood sampling device as described in Japanese Patent Publication No. 51-3153 has been proposed. The vacuum blood collection device is decompressed by a vacuum pump and has a vacuum blood collection chamber in which a blood container is set. Blood is collected in the blood container by the negative pressure generated in the vacuum blood collection chamber.

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

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional vacuum blood sampling apparatus, a large negative pressure is applied to the vacuum blood sampling chamber in order to obtain suction power for blood sampling. Therefore, even if the blood container contained in the vacuum blood collection chamber should be slightly damaged, it will be difficult to see it from the outside and the occurrence of blood leakage from the damaged part will be delayed. In addition, a small amount of blood may be blocked by the blood container and delay detection, leading to a large damage to the container and a large amount of blood leakage.

Therefore, in view of the above problems, it is an object of the present invention to provide a vacuum blood sampling apparatus that can quickly detect and detect blood leakage from a blood container.

[0006]

[Means for Solving the Problems]

 To achieve the above object, a vacuum blood collection chamber is provided which is decompressed by a vacuum pump and in which a blood container formed of a soft material is set, and blood is drawn into the blood container by negative pressure generated in the vacuum blood collection chamber. In the vacuum blood sampling apparatus for performing the above, the vacuum blood sampling apparatus is characterized by including a blood leakage sensor for detecting blood leakage from the blood vessel.

[0007]

[Action]

 According to the vacuum blood sampling device of the present invention, since the blood sampling device has a blood leakage sensor for detecting blood leakage from the blood container, it is possible to detect blood leakage from the blood container without opening the vacuum blood sampling chamber. When a blood leak is detected by the blood leak sensor, a buzzer that sounds the blood leak sounds. With this, the fact of blood leak can be found promptly. Note that the buzzer that informs of blood leakage sounds differently than other buzzers, such as the buzzer for negative pressure or rocking motor error, so the fact of blood leakage and other errors is not confusing.

[0008]

【Example】

 1 is a front view showing a blood collecting device according to an embodiment of the present invention, FIG. 2 is a side view showing a main part of FIG. 1 in a cutaway manner, FIG. 3 is a plan view of FIG. 1, and FIG. FIG. 5 is a plan view showing a main part in a broken manner, FIG. 5 is a vacuum circuit diagram, FIG. 6 is a control block diagram, and FIG. 7 is a diagram showing an open / close control state of an on-off valve and a pressure state of a vacuum blood collection chamber.

As shown in FIGS. 1 to 4, the blood collecting device 10 includes a display panel 12 on the front surface of a housing 11, and a vacuum blood collecting chamber 13 is formed inside the housing 11. Reference numeral 14 is an opening / closing lid of the blood collection chamber 13, 15 is a hinge of the lid 14, and 16 is a 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 connected to an intake port 17 A of a vacuum pump 17 to enable decompression, and a bag tray supporting a blood bag (blood container) 1 made of soft polyvinyl chloride or the like. Equipped with 19. The blood collection device 10 applies a predetermined negative pressure to the blood bag 1 supported by the bag tray 19 to collect blood under the reduced pressure in the vacuum blood collection chamber 13. At this time, the blood collecting apparatus 10 swings the bag tray 19 to stir the anticoagulant such as heparin and the like preloaded in the blood bag 1 and the blood, and to measure the weight of the blood bag 1. The blood collection amount is measured by.

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

First, a pedestal 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 pedestal 20. A swing motor 23 is fixed to the gantry 20 and a driving shaft 24 driven by the swing motor 23 is 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, one end of a link 29 is connected to a half radius of rotation of the crank wheel 28, and the other end of the link 29 is a connecting piece integrated with the swing frame 22. It is connected to 30.

On the other hand, a pair of scale mounting blocks 31 are fixed on the upper surface of the swing frame 22, and a scale (blood sampling amount measuring means) 33 is placed on a support plate 32 that is laid across the ends of both mounting blocks 31. Supported. The scale 33 is provided with strain gauges 34 as weight sensors that are attached to the upper surface 2 position and the lower surface 2 position respectively to form a Wheatstone bridge circuit, and a weighing platform 35 and a receiving plate 36 are provided at the tip of the scale 33. The above-mentioned bag tray 19 is fixed via. Reference numeral 37 is a stopper that prevents the balance 33 from swinging left and right, and 38 is a weight sensor amplification unit.

That is, the blood collecting apparatus 10 rotates the driving shaft 24 and the crank wheel 28 by the operation of the rocking motor 23, thereby rocking the rocking frame 22, and the rocking frame 22 via the scale 33. The supported bag tray 19 is swung. The blood collecting device 10 also supports the bag tray 19 on a scale 33 that is cantilevered on the swing frame 22 via a mounting block 31 and a support plate 32. The weight of No. 1 is measured, and the blood collection amount is measured.

The blood collecting device 10 detects the rotational position of the detection cam 39 provided at the other end of the driving shaft 24 by the optical sensor 40, and thereby controls the swing motor 23 to drive the bag. The weight of the blood bag 1 is measured as described above under the condition that the pan 19 is temporarily stopped at the lowest point (bottom dead center) and is held under a constant posture condition.

As shown in FIG. 5, the blood collecting apparatus 10 has a vacuum path extending from the suction port 17A of the vacuum pump 17 to the vacuum blood collecting chamber 13, and in this embodiment, the vacuum pipe 41 is provided with two large and small air inlets 41A and 41B. ing. An on-off valve 4 that opens and closes the air inlets 41A and 41B by turning on and off the solenoids 42A and 42B, and opens the air inlets 41A and 41B by gravity by turning off the opening and closing solenoids 42A and 42B. It is equipped with 3A and 43B. The open / close valves 43A and 43B may be provided with an elastic body that applies a valve opening force between the open / close valves 43A and 43B and the inner wall surface of the vacuum pipe 41. The blood collection device 10 forms a constant negative pressure (vacuum degree) in the vacuum blood collection chamber 13 by controlling the opening / closing valve 43B provided in the small air inlet 41B, and at the end of blood collection, both air inlets 41A, 41B. The vacuum blood collection chamber 13 is exposed to the atmosphere by opening the opening / closing valves 43A and 43B (see FIG. 7).

The blood collection device 10 is provided with a tube holder 44 at a portion adjacent to the vacuum blood collection chamber 13 on the upper part of the front side of the housing 11, and draws out the blood collection tube 2 connected to the blood bag 1 housed in the vacuum blood collection chamber 13. It is possible. The tube holder 44 includes a tube clamp (blood collection stopping means) 46 driven by a tube clamp solenoid 45, and the tube clamp 46 closes the blood collection tube 2 by clamping and stops the blood collection operation in the blood bag 1. Reference numeral 47 is a clamp release button for the tube clamp 46, and 48 is a clamp button for activating the tube clamp 46 in an emergency.

The display panel 12 of the blood collection device 10 includes a blood collection amount / vacuum degree change lamp 49, a blood collection amount / vacuum degree change switch 50, a 400 ml / 200 ml change indication lamp 51, a 400 ml / 200 ml change switch 52, a stop switch 53, A start switch 54, a used bag display lamp 55, a used bag changeover switch 56, and a blood collection / vacuum degree display unit 57 are provided. The blood collection device 10 includes a power switch 58 and a fuse holder 59 in the lower front portion of the housing 11, and a power connector 60 in the lower rear portion of the housing 11.

Next, the control device 18 of the blood collection device 10 will be described. As shown in FIG. 6, the control device 18 mainly includes a main control circuit 61, a drive circuit 62, and a display circuit 63. In addition, 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 67. , An LED (light emitting diode) drive circuit 68, a buzzer 69, and a fail-safe circuit 70. It should be noted that the detection signals of the above-mentioned optical sensor 40 for detecting the swinging position of the bag tray 19 and the blood leak sensor 71 for detecting blood leak from the blood bag 1 are transferred to the input / output control unit 67. Is becoming

The blood leak sensor 71 is provided on the inner bottom surface of the bag tray 19 as is apparent from FIG.

The memory 66 is composed of a non-volatile memory such as an EA-ROM and an EEP-ROM, and can rewrite and read the stored data and can retain the stored data without applying 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 blood collection amount in the blood bag 1, the swing extension time of the bag tray 19 after the blood collection is completed, and the like.

The buzzer 69 sounds differently depending on the completion of blood collection, an error in the negative pressure formed in the vacuum blood collection chamber 13, the rocking motor 23, the blood leak detection by the blood leak sensor 71, and the like.

The fail-safe circuit 70 monitors the occurrence of runaway of the CPU 65 and stops the device on the safe side 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 above-mentioned weight sensor amplification unit 38 is connected to the A / D conversion circuit 72, and the pressure sensor 73, which is provided in the above-mentioned vacuum pipe 41 and detects the negative pressure of the vacuum blood collection chamber 13, connects the pressure sensor amplification circuit 74. Connected through.

The drive circuit 62 includes a solenoid drive circuit 75 that controls the tube clamp solenoid 45, a solenoid drive circuit 76 that controls the open / close solenoids 42A and 42B, and a pump that turns on / off the power supply switch 77 of the vacuum pump 17. A drive circuit 78 and a motor drive circuit 80 for turning on / off the power supply switch 79 of the swing motor 23 are provided.

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 the stored data of the memory 66, and the detected pressure matches the above set pressure. As described above, the on / off solenoid 42B of the on-off valve 43B is on / off controlled as shown in FIG. As a result, the negative pressure force in the vacuum blood collection chamber 13 slightly changes within a fixed range of the set pressure as shown in FIG. 7C, resulting in a constant pressure state.

The set pressure of the vacuum blood collection chamber 13 can be changed by rewriting the data stored in the memory 66.

The display circuit 63 is connected to the main control circuit 61, and has various indicators such as the display lamp 49 and the like provided on the display panel 12 as described above, and various switches such as the changeover switch 50. Consists of

Next, a blood collection operation procedure by the blood collection device 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. The selection result is displayed on the switching display lamp 51.

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

The blood collecting needle provided at the end of the blood collecting tube 2 is punctured by the donor to collect blood to some extent.

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

The start switch 54 is turned on. The controller 18 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. Further, the control device 18 obtains the output of the weight sensor amplification unit 38 to detect the measured blood collection amount of the blood bag 1 at the time when the bag tray 19 temporarily stops at the lowest point, and at the same time, writes it in the memory 66. Using the set blood collection amount, the specific gravity of blood, and the preregistered weight of the blood bag 1, the remaining blood collection amount (volume) is calculated by the following equation (1).

Remaining blood collection amount (ml) = [set blood collection amount (g) + pre-registered weight (g) -measured blood collection amount (g)] / specific gravity (g / ml) (1) The controller 18 calculates the above. On condition that the resulting residual blood collection amount has reached zero, the blood collection tube 2 is closed by the tube clamp 46 and the blood collection operation for the blood bag 1 is stopped. At this time, the controller 18 stops the vacuum pump 17 and opens the open / close valves 43A and 43B as described above to open the vacuum blood collection chamber 13 to the atmosphere.

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, 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 taken out from the vacuum blood collection chamber 13.

Next, the operation of the above embodiment will be described with reference to FIG.

According to the above-described embodiment, the signal detected by the blood leak sensor 71 is input to the input / output control unit 67, and a predetermined signal is output to the buzzer 69 to warn that blood is leaking. The buzzer 69 makes a predetermined sound.

[0042]

[Effect of the device]

 According to the vacuum blood sampling apparatus of the present invention, it is possible to quickly detect and detect blood leakage from the blood container housed in the vacuum blood sampling chamber during blood sampling without opening the vacuum blood sampling chamber.

[Brief description of drawings]

FIG. 1 is a front view showing a blood collecting device according to an embodiment of the present invention.

FIG. 2 is a side view showing a main part of FIG. 1 in a cutaway manner.

FIG. 3 is a plan view of FIG. 1.

FIG. 4 is a plan view showing a main part of FIG. 1 in a cutaway manner.

FIG. 5 is a vacuum circuit diagram.

FIG. 6 is a control block diagram.

FIG. 7 is a diagram showing an open / close control state of an open / close valve and a pressure state of a vacuum blood collection chamber.

[Explanation of symbols]

 1 ... Blood Bag (Blood Container) 10 ... Blood Collection Device 13 ... Vacuum Blood Collection Room 17 ... Vacuum Pump 71 ... Leakage Sensor

Claims (1)

[Scope of utility model registration request] 1. A vacuum for depressurizing by a vacuum pump and having a vacuum blood collection chamber in which a blood container formed of a soft material is set, and for collecting blood in the blood container by negative pressure generated in the vacuum blood collection chamber. A blood sampling device, comprising: a blood leakage sensor for detecting blood leakage from the blood container.