JPS63174662A - Blood sampler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a blood sampling device for safely and easily collecting blood from a blood donor.

(Prior Art) Conventionally, tourniquets made of rubber tubes have been used to facilitate the collection of blood from victims. The tourniquet is tightened around the patient's limb, and blood is drawn from a blood collection needle inserted into the distended vein between the tourniquet and the end of the arm (leg).

(Problem to be solved by the invention) However, the method using a forward band made of a rubber tube is not recommended for long-term extracorporeal blood circulation treatment because there is a risk that toxins may stagnate in the forward band. The drawback is that it cannot be done.

Furthermore, since there was no conventional device with a function to monitor the condition of the blood donor, there was a drawback that blood collection continued even though the donor's condition was deteriorating, making it impossible to maintain safety.

Therefore, an object of the present invention is to provide a blood sampling device that can improve the efficiency of blood sampling while maintaining the safety of blood donors, and has a function of monitoring the condition of the blood donor without stopping blood sampling.

(Means for Solving the Problems) The device of the present invention is attached to a part of the body of a subject,
A cuff for assisting blood removal that changes the pressure state of the part by air pressure to ensure an ocean current for blood collection; a cuff for blood pressure measurement that is attached to the upper arm of a subject to measure blood pressure; A tube for assisting blood removal, which is connected to a cuff for assisting blood removal and has an exhaust valve attached to a branch, is connected to the cuff for measuring blood pressure.

and a blood pressure measurement tube having an oriice attached to a branch thereof, an air tube in which the two tubes and an air pump are connected via a flow path switching means, and a pressure detection means for detecting the pressure within the air tube.

A microphone attached to the blood pressure measurement cuff detects the Korotkoff sound, which is the sound of blood flowing in the subject's arm, and a microphone that operates a relaxation time setting timer upon receiving a blood removal start signal and switches the flow path. A blood removal assisting means that connects the cuff for assisting in blood removal and an air pump by driving the means, and also drives the air pump to compress the part to which the cuff for assisting blood removal is attached, and the blood removal time setting timer. In response to the blood removal end signal, the exhaust valve is opened, the flow path switching means is driven to connect the blood pressure measurement cuff and the air pump, and the air pump is driven to supply air to the blood pressure measurement cuff. supply.

After detecting Korotkoff sounds with the microphone and measuring blood pressure,
A blood sampling apparatus characterized in that the blood removal assisting means is equipped with a blood pressure measuring means for transmitting a blood removal start signal.

(Function) In the above configuration, when collecting blood, the cuff for assisting dust removal is activated and the part of the body of the subject to which the cuff is attached is pressed with a constant pressure, making it easy to collect blood. After blood collection for a certain period of time, the cuff for blood pressure measurement is first pressurized to measure blood pressure, and immediately after the measurement, the cuff for assisting blood removal is activated again.

Blood can be constantly collected without interrupting blood collection when measuring blood pressure. Additionally, since blood pressure is measured at regular intervals, the donor's condition can be constantly monitored during blood sampling, making it possible to collect blood extremely safely.

(Example) Next, one embodiment of the device of the present invention will be described with reference to the drawings.

Figure 1 shows the cause of blockage in the device of the present invention, which is used to measure blood pressure by tightening around the donor's limbs and tightening around the periodic part and repeatedly inflating and deflating. A cuff 2 for blood pressure measurement, a microphone 3 attached to the cuff 2 for blood pressure measurement to detect Korotkoff sounds, and blood removal from an air tube 4 via a flow path switching means 5. An air pump 11 that sends air through the auxiliary tube 6 or the blood pressure measurement tube 7 to the blood removal assistance or blood pressure measurement cafe 2, and releases the air pressure generated by driving the pump to the outside. An exhaust valve 8 that periodically inflates and deflates a cuff for assisting blood removal by opening and stopping the blood removal, and a cuff 2 for blood pressure measurement that is pressurized to a constant pressure during surface pressure measurement. The orifice 9 for decompressing the blood and the blood removal time setting timer 12 are activated, and the cuff pressure is intermittently maintained for a predetermined period of time while monitoring the pressure from the pressure detection means 13 at the cuff for assisting blood removal. Blood removal assisting means 9 for sending air and blood pressure measuring means 10 for measuring blood pressure by supplying air to the blood pressure measuring cuff 2
The main part is a control device 14 consisting of:

Café VI is an inflatable air bag that can compress the circumference of a blood donor's limbs over a predetermined length to assist in blood removal, and is used as a cuff used in blood pressure monitors.

The air pump 11 is a small diaphragm pump.

An air pump such as a bellows pump that can obtain a flow of 31/min or more and a pressure of 200 to A valve is used.

As the flow path switching valve 5, a three-way solenoid valve is normally used.

This valve is normally connected to a blood removal assisting tube 6.
When the power is turned on, it switches to Chinny Pro for blood pressure measurement.

The orifice 9 is for removing all the air accumulated in the cuff 2 for blood pressure measurement at a fixed rate, and the orifice used in commercially available blood pressure monitors is used. The microphone 3 is for detecting Korotkoff sounds (blood flow sounds), and is a microphone used in commercially available blood pressure monitors.

The control device 14i'! is a device consisting of a microcomputer, which operates a blood removal time setting timer 12'f in response to an external start signal, drives the flow path switching means 5, and connects the blood removal assisting tube 6 and the air tube 4. A blood removal assisting means 9 is connected to the blood removal assisting means 9 and drives an air pump 1lf to inflate the blood removal assisting cuff pressure, and the blood removal time setting timer 12
Upon receiving the blood removal end signal from the controller, the exhaust valve 8 is opened, the flow path switching means 5 is driven to connect the blood pressure measurement tube 7 and the air tube 4, and the air pump 11 is driven to connect the blood pressure measurement tube 7 and the air tube 4. cuff 2t - after inflating and measuring blood pressure.

FIG. 2 is a block diagram showing a specific configuration of the control device 14, which is equipped with a blood pressure measuring means 10 that sends a blood removal start signal to the blood removal assisting means 9. Width increaser 1
5. Exhaust valve driver 16. Nitrogen pump driver 17. a blood removal control section including blood removal time setting and pressure setting means 18;
Pressure detection means/amplifier for amplifying the signal 15. Filter amplifier 19 for amplifying the signal from the microphone 3. It is composed of a blood pressure measurement control section consisting of a flow path switching means driver 20 and a gust pump driver 17.

Pressure control of the cuff pressure for assisting blood removal is performed by a pressure detection means 13 (
(usually a semiconductor pressure quadrature transducer or the like is used) and an amplifier 1 that amplifies the noise detected by the pressure detection means.
5. Compare the pressure signal (to) with the signal set by the interface 20 and pressure setting means 18 for converting the amplified signal (to) from the amplifier from analog to digital with an A/D converter and importing it into the CPU. The CPU 22 then sends a pump driving signal vJ until the cuff pressure reaches the set pressure, and when the cuff pressure reaches the set pressure, sends a stop signal.

On the other hand, according to the inflation (pressurization) time and air release (deflation) time of the cuff pressure for assisting blood removal set by the blood removal time setting means 20, C)'U22 turns the exhaust valve driver 16 to 0N10FF.
let

Similarly, to control the pressure of the cuff 2 for blood pressure measurement, the CPU issues a pump drive signal until the blood pressure reaches the systolic blood pressure or higher, and stops when the set pressure is reached. When the pump stops, air from cuff 2 is released from orifice 9.

The Korotkov signal (to) which is extracted at a certain rate and passed through the microphone 3 and the filter amplifier circuit 19 is sent to the A/D.
A/DK conversion is performed by the converter 21, and input to the CPU 22, where the systolic blood pressure and diastolic blood pressure are determined.

Next, the operation of the apparatus of the present invention will be explained with reference to the time chart of FIG. 3 and the flow chart of FIG. 4.

First, the pressurization cycle T1 and exhaust cycle T2 during blood removal, the pressure Po of the cuff for assisting blood removal, the blood removal cycle To, the pressure PM of the cuff for blood pressure measurement, and the timer T from the start of blood removal to the end of blood pressure measurement.
When the pressurized exhaust timer To for blood removal is set and the blood removal mode is started, the three-way switching valve 5 is initially closed and the air pump 11 is connected to the blood removal cuff 1. Then, a valve drive signal (0) is periodically transmitted to the exhaust valve driver 16 of the pressurization/exhaust cycle setting means 18 which sets the inflation time (TI) and deflation time (T2) of the cuff pressure.

On the other hand, the detected cuff pressure is amplified by the amplifier 15, and the amplified pressure signal (d) is converted into a digital signal by the A/D converter 21 and sent to the CPU 2 via the interface 2o.
2. Then, the pressure setting means 18 sends a pump drive signal (c) to the pump driver 17 until the set pressure is reached.

FIG. 3 is a time chart when a cuff with some leakage is used, and a pump drive signal is intermittently transmitted so that the cuff pressure is always maintained at the set pressure during the cuff inflation time (T1).

When the blood pressure measurement cycle (To) has elapsed from the start of blood removal, the three-way switching valve 5 is energized, the air pump 11 is connected to the blood pressure measurement cuff 2, and the blood pressure measurement mode is entered. In this mode, following the operation of a commercially available blood pressure monitor, a pump drive signal (c) is first transmitted to the pump driver 17 until the blood pressure reaches or exceeds the patient's systolic blood pressure. When the blood pressure exceeds the systolic pressure, the air pump 11 stops and the orifice 9 maintains a constant pressure. The Korotkoff sound (blood flow sound) detected by the microphone 3 is amplified by the filter amplification circuit 19 and sent as a Korotkoff signal to the A/D converter 21 and the interface.
The data is taken into the CPU 22 via the process 20, and the blood donor's systolic blood pressure and diastolic blood pressure are measured.

When the diastolic blood pressure is reached, the blood pressure measurement is completed, the blood removal mode is entered again, and the above-mentioned operations are performed again.

The measured blood pressure value is displayed on the display 2 via the display driver 23.
4 and printed on the printer 26 via the printer driver 25. The above series of operations are RO
CPU22 according to the program stored in M27
Executed by Furthermore, it is possible to issue an alarm based on the measured blood pressure value to notify of deterioration of the patient's condition.

In the above embodiment, blood pressure is measured by the Korotkoff method using a microphone, but the Doppler method using an ultrasonic transducer or the oscilloscope method using a pressure transducer may also be used.

(Effects of the Invention) As described above, the device of the present invention is applicable to all cases where blood is collected by venipuncture, and is particularly effective as a plasma collection device for collecting plasma from a blood donor. This device can be constructed by using a blood removal auxiliary device and a conventional blood pressure monitor, and by simply adding an exhaust electromagnetic valve and a three-way cuff switching valve to the blood pressure monitor. Such a device is inexpensive, portable, and allows blood to be collected while monitoring the patient's condition, so it has the advantage of sufficiently maintaining the safety of blood donors.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the blood sampling device of the present invention, and FIG. 2 is a block diagram showing the specific configuration of the control device.
FIG. 3 is a time chart of the apparatus of the present invention, and FIG. 4 is a flow chart.

Claims (1)

[Claims] A blood removal assisting cuff is attached to a part of the subject's body to change the compression state of that part using air pressure to secure blood for blood collection, and a cuff is attached to the subject's upper arm to control blood pressure. a blood pressure measurement cuff for measuring blood pressure, a blood removal support tube connected to the blood removal support cuff and having an exhaust valve attached to a branch, and a blood removal support tube connected to the blood pressure measurement cuff and having an orifice attached to the branch. an air tube connecting the two tubes and the air pump via a flow path switching means; a pressure detection means for detecting the pressure within the air tube; attached to the cuff of
A microphone that detects the Korotkoff sound, which is the sound of blood flowing in the arm of the patient, and a blood removal timer that activates a blood removal time setting timer in response to a blood removal start signal, and drives a flow path switching means to assist blood removal. blood removal assisting means that connects the cuff of the blood removal and the air pump and drives the air pump to compress the part to which the blood removal assistance cuff is attached, and a blood removal end signal from the blood removal time setting timer , opens the exhaust valve, drives the flow path switching means to connect the blood pressure measurement cuff and the air pump, drives the air pump to supply air to the blood pressure measurement cuff, and uses the microphone to connect the blood pressure measurement cuff to the air pump. A blood sampling device comprising a blood pressure measuring means for detecting sound and measuring blood pressure and then transmitting a blood removal start signal to the blood removal assisting means.