WO2019008447A1

WO2019008447A1 - Pneumatic blood drawing apparatus and use method therefor

Info

Publication number: WO2019008447A1
Application number: PCT/IB2018/051379
Authority: WO
Inventors: 刘俊彦
Original assignee: 刘俊彦
Priority date: 2017-07-06
Filing date: 2018-03-05
Publication date: 2019-01-10
Also published as: AU2018295510A1; CN108451579B; CN108451579A; AU2018295510A2; TWM572235U; CN209332172U

Abstract

A pneumatic blood drawing apparatus and a use method therefor. The pneumatic blood drawing apparatus comprises a cuff (10), a main control unit (11), and an air inflating unit (12), an air bleeding unit (14), and a timing unit (13) which are connected to the main control unit (11); an air outlet pipe (121) of the air inflating unit (12) is connected to the cuff (10) by means of an air pipe (15); the air bleeding unit (14) is connected to the air outlet pipe (121) of the air inflating unit (12); the air inflating unit (12) is used for inflating the cuff (10) by means of the air pipe (15) according to a default pressure vale in the cuff (10); the timing unit (13) is used for performing timing according to a preset blood drawing time; when the preset blood drawing time is reached, the main control unit (11) controls the air inflating unit (12) to stop running and opens the air bleeding unit (14) to release air in the cuff (10). The blood drawing apparatus is able to reduce labor intensity, solves the problem of ischemia caused when a blood drawing cuff is left on a patient and presses the wrist or the arm for a long time, and is safe and reliable.

Description

-Pneumatic blood drawing device and using method thereof

[Technical Field]

The present invention relates to the field of medical device technology, and in particular to a pneumatic blood drawing device for blood collection and a method of using the same.

【Background technique】

In a hospital or clinic, a venipuncture or venous incision is usually performed on a patient's limb to draw blood. In order to venge puncture, the vein must first be congested by preventing blood from returning from the vein while allowing the artery to flow in. It is currently performed using blood drawn upstream of the limb venipuncture site, as shown in Figure 1. The blood strip 1 is usually a rubber tube or a flat rubber band. When the banding is performed, the patient may be over-tightened, causing discomfort, and the arterial blood flow may be blocked, and if the blood-sucking band is leaked on the patient, it may be caused by a long time. Bundled on the patient's limb, the patient's limb may cause limb damage due to ischemia.

[Summary of the Invention]

The object of the present invention is to overcome the deficiencies of the above techniques and to provide a pneumatic blood drawing device and a method of using the same. A first aspect of the present invention provides a pneumatic blood drawing device including a cuff, further comprising a main control unit, an inflation unit connected to the main control unit, a deflation unit, and a timing unit; the air outlet member of the inflation unit passes through a gas pipe The cuff connection; the deflation unit is coupled to an air outlet component of the inflation unit; the inflation unit is configured to inflate the cuff through the air tube according to a pressure value within a default cuff; The unit is configured to time a predetermined blood collection time. When the predetermined blood collection time arrives, the main control unit controls the inflation unit to stop running, and the air release unit opens to release air in the cuff. Further, an alarm unit connected to the main control unit is further included for alerting the remaining blood collection time.

Further, the alarm unit is a buzzer and/or a warning light, the buzzer is used to emit sounds of different frequencies to alert the remaining blood collection time, and the warning light is used to issue different light warnings to warn the remaining blood collection time.

Further, the air pressure detecting unit is further configured to detect a pressure value in the air pipe; and the air pressure detecting unit is respectively connected to the air outlet component of the main control unit and the airing unit.

Further, the air pressure detecting unit is an air pressure sensor.

Further, a display unit connected to the main control unit is further included for displaying information related to the blood collection process.

Further, the display unit includes a display screen and/or a pressure indicator light.

Further, a manual control unit is further included, and the manual control unit is connected to the main control unit for manual control of the device.

Further, the manual control unit includes a pressure selector and a switch button; the pressure selector is for selecting a preset pressure value, and the switch button is for opening and/or stopping the device.

Further, the cuff is provided with an air inlet, and the air pipe is detachably connected to the air inlet. A second aspect of the present invention provides a method of using a pneumatic blood drawing device, comprising the steps of: attaching a cuff to a limb;

The operation of the inflatable unit is controlled by a main control unit, which is indicated by P according to a default pressure value, and inflates the cuff through the air pipe;

Controlling the deflating unit to be closed by the main control unit;

After the inflating unit is operated and the deflating unit is turned off, the timing unit is controlled to be started by the main control unit to time the predetermined blood collection time; When the predetermined blood collection time arrives, the main control unit controls the inflation unit to stop operating, and the air release unit opens to release air in the cuff.

Further, the method further includes the following steps: after the timing unit is started, the alarm unit is controlled by the main control unit, and the alarm unit issues a warning to the remaining blood collection time.

Further, the alarm unit is a buzzer and/or a warning light that emits a different frequency of sound to alert the remaining blood collection time, the warning light emitting a different light warning to alert the remaining blood collection time.

Further, the method further includes the following steps: after the operation of the inflating unit and the closing of the air release unit, detecting a pressure value in the air pipe by the air pressure detecting unit; the main control unit detects the pressure value and the preset pressure in the air pipe The values are compared and the aeration unit is controlled to operate at different duty cycles based on the comparison.

Further, when the main control unit compares the detected pressure value in the trachea with the preset pressure value, and controls the inflating unit to operate at different duty ratios according to the comparison result, specifically:

If the detected pressure value in the trachea is higher than the preset pressure value of 5 mmHg, the inflating unit operates at a duty ratio of 10%; if the detected pressure value in the trachea is higher than the preset pressure value and is not higher than 5 mmHg at the same time, inflating The unit operates at a duty cycle of 40%; if the pressure value in the detected air pipe is lower than the preset pressure value and is not lower than 5 mmHg at the same time, the aeration unit operates at a duty ratio of 55%; otherwise, the aeration unit is 100% The duty cycle runs.

The pneumatic blood drawing device of the present invention inflates the cuff into the cuff by the inflation unit, so that the cuff is pressed against the limb of the patient, thereby collecting blood, saving time and labor, and simultaneously releasing the air in the cuff through the timing unit and the deflation unit. It also completely solves the limb damage caused by the ischemia caused by the blood-sucking belt in the patient's body and causes the blood-sucking belt to press the wrist or arm for a long time, and realizes intelligent decompression, which is safe and reliable.

[Description of the Drawings] 1 is a schematic view showing the structure of a prior art blood-sucking band tying in the upstream of a limb venipuncture site; FIG. 2 is a schematic structural view of a pneumatic blood-drawing device according to the present invention; FIG. 3 is a schematic block diagram of the pneumatic blood-drawing device shown in FIG. Figure 4 is a schematic diagram of the relationship between diastolic blood pressure and heartbeat.

【Detailed ways】

The invention will now be further described with reference to the drawings and embodiments. Embodiment 1 Referring to FIG. 2 and FIG. 3, the present invention provides a pneumatic blood drawing device for use as an auxiliary tool for blood collection, comprising a cuff 10, a main control unit 11, an inflation unit 12 connected to the main control unit 11, and timing. Unit 13 and deflation unit 14. In the present embodiment, the cuff 10 has a size of 8*43 cm and is suitable for use on the wrist and arm for attachment upstream of the venipuncture site. The specific dimensions of the cuff 10 do not constitute a limitation of the present invention. The front and back sides of the cuff 10 are connected by Velcro or Velcro for easy tie. In other embodiments, the connection manner of the cuff can also be other feasible connection manners. For example, the cuff 10 can also be a loop sleeve, which can be directly sleeved on the wrist or the arm, so the specific connection manner of the cuff does not constitute Limitations of the invention. The inflator unit 12 is provided with an air outlet member. Preferably, the air outlet member is an air outlet tube 121. In other embodiments, the air outlet component may also be an air outlet. In this embodiment, the air outlet pipe 121 is connected to the cuff 10 through a gas pipe 15. Specifically, the cuff 10 is provided with a gas storage space (not shown here), and the cuff 10 is connected to the gas storage space. The air inlet 101, the air tube 15 and the air inlet 101 are detachably connected, for example, by screwing, socketing, etc., so that the cuff 10 can be reused or a disposable item. The inflating unit 12 is used to inflate the cuff 10 through the trachea 15 according to the pressure value in the default cuff 10, so that the air pressure in the air storage space in the cuff 10 is increased to be pressed against the wrist or the arm for blood collection without medical treatment. The staff can tie the wrist or arm to save time and effort. In this embodiment, the inflator unit 12 is an air pump. The charging frequency of the inflating unit 12 may be constant, or may be divided into a plurality of stages according to the instruction of the main control unit 11, such as a two-stage type, a three-stage type, or the like.

The main control unit 11 is a microprocessor, and the microprocessor mainly controls other components of the device by transmitting different PWM (Pulse Width Modulation), for example, controlling the operation and stop of the inflator 12, and the air release unit 14 is turned on. And close the action.

The deflation unit 14 is connected to the air outlet pipe 121 of the plenum unit 12, and the deflation unit 14 can be, for example, a solenoid valve or a group of solenoid valves. In this embodiment, the deflation unit is a solenoid valve. The specific type and number of solenoid valves do not constitute a limitation of the present invention.

The timing unit 13 is for counting a predetermined blood collection time, and the timing unit 13 can be, for example, a timer or a group of timers. The specific model number, brand and number of timers do not constitute a limitation of the present invention. When the predetermined blood collection time has elapsed, the main control unit 11 controls the inflation unit 12 to stop operating, and the deflation unit 14 is opened to release the air in the cuff 10. After clinical testing, the venipuncture blood draw time is generally completed within 3 minutes. In this embodiment, the predetermined blood collection time is generally 3 minutes, and the timing unit 13 counts the time of 3 minutes of blood collection. If the blood draw is not completed within 3 minutes, you can press the start/reset unit 13 before the end time to regain another 3 minutes. When the 3 minute time has elapsed, the main control unit 11 controls the inflating unit 12 to stop running, and the air release unit 14 is opened to release the air in the cuff 10, so that the cuff 10 is no longer pressed against the wrist or the arm, and the cuff 10 can be prevented from being long. Time oppresses the wrist or arm to cause limb damage caused by ischemia, and achieve intelligent decompression. The cuff 10 can be removed from the wrist or arm after the air in the cuff 10 is released. The specific blood collection time will be adjusted according to actual medical needs and does not constitute a limitation of the present invention. The timing mode can also be changed depending on the change in the air pressure value in the cuff 10. For example, when the air pressure value in the cuff 10 is higher than 5 mmHg, the timing unit 13 starts to operate until a predetermined time; or when the air pressure in the cuff 10 is less than 5 mmHg, the timing unit 13 stops operating. This This is because when the air pressure in the cuff is less than 5 mmHg, the pressure of the cuff cannot effectively compress the limb of the patient, so that there is no need for timing.

In order to alert the medical staff or patient to the remaining blood collection time, preferably, the present invention is provided with an alarm unit 16, which is coupled to the main control unit 11 for alerting the current remaining blood collection time. The remaining blood collection time, i.e., the remaining time from the main control unit 11 to control the inflating unit 12 to stop operating and the air release unit 14 to open to release the air in the cuff 10 is released. The alarm unit 16 can audibly alert the medical staff or the patient, for example, the alarm unit 16 can be a buzzer 161 for emitting sounds of different frequencies to alert the remaining time. For example, the timing unit 13 sets the blood collection time of 3 minutes. After the timing unit 13 is started, the buzzer 161 indicates the length of the remaining time in different sound combinations: when the remaining time is more than 1 minute, the buzzer 161 is every two The frequency of one second emits a sound; when the remaining time is more than 30 seconds but less than 60 seconds, the buzzer 161 emits sound at a frequency of once per second; when the remaining time is less than 30 seconds, the buzzer 161 is twice per second. The frequency of the sound makes a reminder to the medical staff. The specific combination of sound frequencies does not constitute a limitation of the present invention, and may be, for example, a combination of two different sound frequencies. The alarm unit 16 can also visually alert the medical staff or the patient, for example, the alarm unit 16 can be a warning light 162 for issuing different light warnings to alert the remaining time. For example, the timing unit 13 sets the blood collection time of 3 minutes. After the timing unit 13 is activated, when the remaining time is more than 1 minute, the warning light 162 emits light at a frequency of once every two seconds; when the remaining time is more than 30 seconds but less than 60 In the second hour, the warning light 162 emits light at a frequency of once per second; when the remaining time is less than 30 seconds, the warning light 162 emits light at a frequency of twice per second, thereby visually reminding the medical staff. Of course, in order to better show the medical staff police, a variety of warning methods can be taken at the same time, for example, while using the auditory and visual reminder of the remaining blood collection time, for example, the alarm unit 16 can be a combination of the buzzer 161 and the warning light 162. Further strengthen the role of warning and reminding.

Preferably, the present invention may also include a display unit 19 coupled to the main control unit 11. This embodiment The middle display unit 19 is an LCD display for displaying information about the blood collection process or device, such as the current blood draw time, the selected pressure level, the current pressure value within the trachea 15, the current diastolic pressure, and the like. The specifically displayed content can be adjusted according to the needs of the user, and thus the specifically displayed content does not constitute a limitation of the present invention. More preferably, the device of the present invention can also be provided with a pressure indicator 163, with different pressure indicators 163 indicating the pressure value of the current cuff 10, so that the medical staff does not need to constantly check the LCD unit 19 to know whether the pressure value of the current cuff 10 is Suitable for patients. For example, the preset pressure values are 70mmHg, 80 mmHg and 90mmHg. Accordingly, the three pressure indicators 163 are correspondingly set to different pressure values, and when the different pressure indicator lights 163 are lit, the current cuff 10 is correspondingly preset. Pressure value. The number of specific pressure indicator lights 163 does not constitute a limitation of the present invention. For example, if the preset pressure value in the cuff 10 is only divided into low pressure and high pressure, only two pressure indicator lights 163 are required.

Preferably, the present invention may further include a manual control unit, specifically a pressure selector 20, a start/restart control button 21, and a stop button 22 in this embodiment. The pressure selector 20 is used to select a preset pressure value within the appropriate cuff 10, and the preset pressure value in the cuff 10 can be plural. In the present embodiment, the preset pressure values in the cuff 10 are three, specifically 70 mmHg, 80 mmHg, and 90 mmHg. The specific number and value of the preset pressure values do not constitute a limitation of the present invention. When a preset pressure value is selected, the main control unit 1 1 can control the inflation unit 12 to inflate the cuff 10 through the air tube 15 according to the default pressure value. The start/restart control button 21 is used for start/restart, that is, when the start/restart control button 21 is pressed, the apparatus of the present invention starts to operate; when the blood draw is not completed within the blood collection time set by the timing unit 13 , press the start/restart control button 21 to retime the blood collection time. If the blood draw is completed ahead of time in the blood collection time set by the timing unit 13, the stop button 22 can also be selected, and the main control unit 11 controls the inflation unit 12 to stop inflating, and the deflation unit 14 deflates to release the air in the cuff 10. .

The present invention may also include a power supply unit 23. This embodiment uses a standard USB 5V power supply for charging power supply. The specific power supply mode does not constitute a limitation of the present invention.

The invention inflates the cuff into the cuff by the inflation unit, so that the cuff is pressed against the limb of the patient, thereby collecting blood, saving time and labor, and simultaneously releasing the air in the cuff through the timing unit and the deflation unit, which can completely solve the blood drawing. With the leakage of the blood on the patient, the blood pressure of the wrist or arm for a long time causes limb damage caused by ischemia, and realizes intelligent decompression, which is safe and reliable. Embodiment 2

The present embodiment is based on the first embodiment, and the same or similar parts as those in the first embodiment will not be described again. The present invention may further include a gas pressure detecting unit 18 connected to the main control unit 11 and the gas outlet pipe 121 of the gas inflating unit 12 for detecting the pressure value in the gas pipe 15 so that the main control unit 11 will pressurize the pressure value and the gas pressure in the gas pipe 15. The pressure values are compared and the aeration unit 12 is controlled to operate at a corresponding duty cycle (Duty Cycle) based on the comparison. Since the inflator unit 12 may leak when it is stationary or slow, the inflator unit 12 needs to maintain an appropriate rotational speed to fix the pressure value in the air tube 15 to a certain air pressure. For example, if the pressure value in the air tube 15 is higher than the preset pressure value by 5 mmHg, the inflating unit 12 operates at a duty ratio of 10% (although theoretically, the inflating unit does not need to be inflated, but in order to make the user feel comfortable, for example Will not feel the sudden change of air pressure on the arm, the aeration unit 12 will run at the slowest 10% duty cycle); if the pressure value in the air pipe is higher than the preset pressure value, and at the same time not higher than 5mmHg, due to The air pressure is not high, and the aeration unit operates at a duty ratio of 40%; if the pressure value in the air pipe is lower than the preset pressure value and not lower than 5 mmHg at the same time, since the difference between the preset pressure values is small, The aeration unit operates at a faster duty cycle of 55%; otherwise, the aeration unit operates at a maximum speed of 100% duty cycle due to the large difference in distance from the preset pressure value. Operating in a segmented duty cycle, the user does not feel obvious discomfort during use, which facilitates the smooth progress of the blood collection process. The above list is a preferred embodiment of the present invention, and the specific number of segment segments and the operating ratio of the duty cycle do not constitute a limitation of the present invention. Since one end of the trachea 15 is connected to the cuff 10, The pressure loss from the air outlet pipe 121 to the air inlet port 101 is almost negligible, so the pressure value of the air pipe 15 can also be regarded as the pressure value in the cuff 10. At the same time, the setting of the air pressure detecting unit 18 does not require changing the structure of the cuff 10, thereby facilitating the replacement of the cuff 10. In this embodiment, the air pressure detecting unit 18 is an air pressure sensor.

The normal human body has a diastolic blood pressure of 60-90 mmHg. Preferably, the preset pressure value is the patient's diastolic pressure and should be greater than 50 mm Hg. A suitable default pressure value can reduce the potential discomfort of the user during the blood collection process. In the present embodiment, the detection of the diastolic pressure is performed by the air pressure detecting unit 18, that is, the air pressure sensor, and the noise filtering is combined with the oscillating amplitude method by the Low Average filter (Low Pass Filter) 24 (Moving Average). l lometric method) or FFT (Fast Fourier Transformation) analysis. Here, the oscillometric amplitude method will be described as an example. The air pump inflates into the cuff and slowly exhausts after reaching a certain pressure value. During the deflation process, the pressure sensor converts the pressure signal in the cuff into an electrical signal and sends it to the main control unit 11 for filtering and algorithm calculation. See Figure 4 for the relationship between diastolic blood pressure and heartbeat. The time-pressure diagram shown above in Figure 4, the cuff pressure is 70-130 mmHg, does not mean that the cuff pressure can extend infinitely upwards or downwards, only to indicate that the cuff 10 will have pressure changes during the exhaust process. . Set the initial preset pressure value to lOOmmHg. If the air pressure detecting unit 18 detects the oscillation of the pulse, the main control unit 11 adjusts the default pressure value, which is adjusted to 5 mmHg as follows. The magnitude of the default pressure value adjustment does not constitute a limitation of the present invention. The above detection process is repeated until the air pressure detecting unit 18 does not detect the pulse oscillation. At this time, the pressure in the cuff is the patient's diastolic pressure. The main control unit 11 can use the measured diastolic pressure as the preset pressure value, and the blood strip will complete the whole blood drawing process under the pressure value of the diastolic pressure, thereby completing the blood collection process better. Embodiment 3

The invention also provides a method for using a pneumatic blood drawing device, comprising the following steps 5101: Attaching the cuff 10 to the limb;

The limb can be any position such as a wrist or an arm that requires venipuncture;

5102: The inflation unit 12 is controlled to operate by the main control unit 11, and the inflation unit 12 inflates the cuff 10 through the air tube 15 according to the default pressure value;

When the inflating unit 12 is operated, the pressure in the cuff 10 is gradually increased, thereby pressing the limb to facilitate blood collection;

5103: controlling the air release unit 14 to be closed by the main control unit 11;

The steps of S102 and S103 are not in the same order, and they can also be performed simultaneously. When the air release unit 14 is turned off, the gas is basically only inaccessible, so that the pressure required for blood collection can be reached in a short time; S104: After the gas unit 12 is operated and the air release unit 14 is turned off, the main control unit 11 is passed. The control timing unit 13 is activated to time the predetermined blood collection time;

S105: After the predetermined blood collection time has elapsed, the main control unit 11 controls the inflation unit 12 to stop running, and the air release unit 14 is opened to release the air in the cuff 10.

By using the use method of the invention, the labor intensity of the medical staff can be effectively reduced, the time and labor can be effectively saved, and the limb damage caused by the ischemia of the wrist or the arm caused by the long-term compression of the blood drawn band on the patient is also completely solved. , to achieve intelligent decompression, safe and reliable. Actual ^ <example four

The present embodiment is based on the third embodiment, and the same or similar parts as those in the third embodiment will not be described again. The embodiment may further include the following steps: after the timing unit 13 is started, the alarm unit 16 is controlled to be activated by the main control unit 11, and the alarm unit 16 issues a warning to the remaining blood collection time. Specifically, the alarm unit 16 is a buzzer 161, and the buzzer 161 emits sounds of different frequencies to warn the remaining blood collection time, which serves as a warning reminder to the medical staff. The alarm unit 16 can also be a warning light 162, a warning light 162 sends out different light or frequency warnings to warn the remaining blood collection time, which is a visual reminder to the medical staff. Of course, the alarm unit 16 can also be a buzzer 161 and a warning light 162 at the same time, which respectively alert the medical staff to the sense of hearing and visually, and strengthen the warning function. In this embodiment, the warning light 162 is one, and lights of different frequencies can be respectively emitted for warning.

Preferably, the embodiment may further include the steps of: detecting the pressure value in the air tube 15 by the air pressure detecting unit 18 after the air unit 12 is operated and the air unit 14 is closed, and the main control unit 11 will detect the pressure in the air tube 15 The value is compared to a preset pressure value and the aeration unit 12 is controlled to operate at a corresponding duty cycle to maintain a constant pressure within the trachea 15 based on the comparison. Specifically, if the detected pressure value in the trachea is higher than the preset pressure value of 5 mmHg, the inflating unit operates at a duty ratio of 10%; if the detected pressure value in the trachea is higher than the preset pressure value, and is not higher than 5mmHg, the aeration unit operates at a 40% duty cycle; if the detected pressure in the air pipe is lower than the preset pressure value and not lower than 5 legs Hg at the same time, the aeration unit operates at a duty cycle of 55%; The aeration unit operates at a 100% duty cycle.

Preferably, the present invention may further comprise the steps of: detecting the cuff pressure by the air pressure detecting unit 18 after the operation of the inflating unit 12 and closing of the air release unit 14, and calculating the diastolic pressure in combination with the main control unit 1 1 and applying the diastolic pressure The value replaces the original preset pressure value. Specifically, when the inflating unit 12 inflates into the cuff 10 to a certain pressure value, the cuff is exhausted. If the air pressure detecting unit 18 detects the oscillation of the pulse, the main control unit 1 1 adjusts the default pressure value, which is adjusted to 5 mmHg as follows. The above detection process is repeated until the air pressure detecting unit 18 does not detect the pulse oscillation.

Preferably, the present invention may further comprise the following steps: after the cuff 10 is attached to the limb, the start button 21 is pressed to start, the air release unit 14 is closed; if the pressure selector 20 is pressed, the preset pressure value may be selected; When the stop button 22 is pressed, the deflation unit is opened to release the air in the cuff, and the blood collection process ends. The above embodiments are merely illustrative of the preferred embodiments of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the inventive concept, such as combining different features in the various embodiments. The scope of protection of the present invention.

Claims

Claim

A pneumatic blood drawing device, comprising a cuff, further comprising: a main control unit, an inflating unit connected to the main control unit, a deflating unit and a timing unit; and an air outlet part of the inflating unit passes through a gas pipe and a a cuff connection; the deflation unit is coupled to an air outlet component of the inflation unit; the inflation unit is configured to inflate the cuff through the air tube according to a pressure value within a default cuff; For counting a predetermined blood collection time, after the predetermined blood collection time arrives, the main control unit controls the inflation unit to stop running, and the air release unit opens to release air in the cuff.

The pneumatic blood drawing device according to claim 1, further comprising an alarm unit connected to said main control unit for alerting the remaining blood collection time.

3. The pneumatic blood drawing device according to claim 2, wherein the alarm unit is a buzzer and/or a warning light, and the buzzer is configured to emit sounds of different frequencies to alert the remaining blood collection time. The warning light is used to emit different lights to alert the remaining blood collection time.

4. The pneumatic blood drawing device according to claim 1, further comprising: a gas pressure detecting unit configured to detect a pressure value in the air tube; the air pressure detecting unit and the main control unit respectively The air outlet components of the inflatable unit are connected.

The pneumatic blood drawing device according to claim 4, wherein the air pressure detecting unit comprises an air pressure sensor.

The pneumatic blood drawing device according to claim 4, further comprising a display unit for displaying related information of the blood collection process; and the display unit is connected to the main control unit.

The pneumatic blood drawing device according to claim 6, wherein the display unit comprises a display screen and/or a pressure indicator light.

8. The pneumatic blood drawing device according to claim 6, further comprising a manual control unit, the manual control unit being coupled to the main control unit for manual control of the device.

9. The pneumatic blood drawing device according to claim 8, wherein the manual control unit comprises a pressure selector and a switch button; the pressure selector is for selecting a preset pressure value, and the switch button is for opening And / or stop the device.

10. The pneumatic blood drawing device according to claim 9, wherein the cuff is provided with an air inlet, and the air tube is detachably coupled to the air inlet.

11. A method of using a pneumatic blood drawing device according to any of claims 1-10, characterized in that it comprises the steps of:

Attach the cuff to the limb;

The operation of the inflatable unit is controlled by a main control unit that inflates the cuff through the trachea according to a default pressure value;

Controlling the deflating unit to be closed by the main control unit;

After the inflating unit is operated and the deflating unit is turned off, the timing unit is controlled to be started by the main control unit to time the predetermined blood collection time;

When the predetermined blood collection time has elapsed, the main control unit controls the inflation unit to stop operating, and the deflation unit opens to release air in the cuff.

The method of using a pneumatic blood drawing device according to claim 11, further comprising the steps of: after the timing unit is started, controlling the alarm unit to be activated by the main control unit, the alarm unit pair The remaining blood collection time is issued a warning.

The method of using a pneumatic blood drawing device according to claim 12, wherein the alarm unit is a buzzer and/or a warning light, and the buzzer emits sounds of different frequencies to alert the remaining blood collection. At the time, the warning light emits a different light warning to alert the remaining blood collection time.

The method of using a pneumatic blood drawing device according to claim 12, further comprising the steps of: after the operation of the inflating unit and the closing of the deflating unit, detecting by the air pressure detecting unit Measuring the pressure value in the trachea; the main control unit compares the detected pressure value in the trachea with a preset pressure value, and controls the inflating unit to operate at different duty cycles according to the comparison result.

The method of using a pneumatic blood drawing device according to claim 14, wherein the main control unit compares the detected pressure value in the trachea with a preset pressure value, and controls the according to the comparison result. The aeration unit operates at different duty cycles as follows:

If the pressure value in the air pipe is higher than the preset pressure value of 5 mmHg, the aeration unit operates at a duty ratio of 10%; if the pressure value in the air pipe is higher than the preset pressure value and not higher than 5 mmHg at the same time, the aeration unit is 40% Duty cycle operation;

If the pressure value in the air pipe is lower than the preset pressure value and not lower than 5mmHg at the same time, the aeration unit operates at a duty ratio of 55%; otherwise, the aeration unit operates at a duty ratio of 100%.

The method of using a pneumatic blood drawing device according to claim 15, wherein the predetermined pressure value is a diastolic pressure.