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Atherosclerosis detector with stable deflation system

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Publication number
CN101843479A
CN101843479A CN 201010176129 CN201010176129A CN101843479A CN 101843479 A CN101843479 A CN 101843479A CN 201010176129 CN201010176129 CN 201010176129 CN 201010176129 A CN201010176129 A CN 201010176129A CN 101843479 A CN101843479 A CN 101843479A
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CN
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Prior art keywords
valve
detector
pressure
atherosclerosis
gas
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CN 201010176129
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Chinese (zh)
Inventor
何为
余传祥
姚世平
张孝贤
李永
林海涛
王兴政
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四川宇峰科技发展有限公司
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Abstract

The invention discloses an atherosclerosis detector with a stable deflation system, which comprises a pressurization micro-inflation pump, a blood pressure cuff, a gas pressure sensor, a slow-speed exhaust valve and an electromagnetic gas bleed valve, wherein the pressure gas outputted by the pressurization micro-inflation pump are divided into four lines which are respectively sent to the blood pressure cuff, the gas pressure sensor, the slow-speed exhaust valve and the electromagnetic gas bleed valve, the slow-speed exhaust valve consists of a valve body, a valve inlet connecting pipe and a valve outlet connecting pipe, the valve body is a capillary made of inorganic non-metal material, and the valve inlet connecting pipe and the valve outlet connecting pipe are medical soft pipes. The atherosclerosis detector has the benefits that due to the adoption of the invention, the atherosclerosis detector can solve the problem that the deflation of the deflation system of the atherosclerosis detector is unstable, so that the authenticity and the reliability of the measurement result are greatly improved; and the structure is simple, the production and the processing are easy, and the practicality is strong.

Description

具有稳定放气系统的动脉硬化检测仪 Bleed air system with stable arteriosclerosis detector

技术领域 FIELD

[0001] 本发明涉及一种动脉硬化检测仪,特别涉及一种具有稳定放气系统的动脉硬化检测仪。 [0001] The present invention relates to a detector arteriosclerosis, particularly to a bleed system having a stable arteriosclerosis detector.

背景技术 Background technique

[0002] 现有技术中,动脉硬化检测仪是通过对血压袖套充气到一定压力值,然后缓慢放气,在放气过程中测量人体的脉搏波形,根据心血管流体力学理论、弹性腔模型理论计算出动脉硬化参数,以此来判断人体的动脉硬化的程度。 [0002] In the prior art, arteriosclerosis detector by blood pressure cuff inflated to a certain pressure value, then slowly deflated, the pulse waveform measured in the body during deflation, according to the theory of hydrodynamics cardiovascular, spring cavity model the calculated theoretical atherosclerosis parameters in order to determine the extent of atherosclerosis in humans. 动脉硬化检测仪放气系统的构成包括: 血压袖套、气体压力传感器、加压微型充气泵、慢速排气阀和电磁泄气阀。 Arteriosclerosis detector configuration bleed air system comprising: a blood pressure cuff, gas pressure sensor, micro-pressure air pump, an exhaust valve and slow release valve solenoid. 在测量过程中,由于人体脉搏信号十分微弱,很容易受到干扰,要使所测的整个脉搏波形完整、真实,血压袖套放气时对压力改变就要求勻速稳定,所以对血压袖套放气速度控制精度要求很高,对放气系统中所使用的慢速排气阀放气速度要求一般在气压压力改变速度为4mmHg/s左右,慢速排气阀的放气速度是否稳定,决定了放气系统放气速度的稳定性,将直接影响动脉硬化检测仪测量结果的真实性和精确性。 During the measurement, the pulse signal is very weak because the human body, it is susceptible to interference, to make the pulse waveform measured across a complete, true, blood pressure cuff pressure change when deflated requires uniform stable, so the blood pressure cuff deflation high precision speed control, the slow exhaust valve of the bleed air system used in the exhaust velocity is generally required air pressure changing rate of 4mmHg / s or so, the slow exhaust valve deflation speed is stable, determine stability of bleed air system deflation rate, will directly affect the accuracy of the measurement result of the authenticity and arteriosclerosis detector.

[0003] 目前动脉硬化检测仪放气系统中所采用的慢速排气阀为机械式慢速排气阀,也称为橡胶排气阀,俗称“气芯”其结构如图1所示;它包括:塑料外壳1、橡胶套管2、带螺纹头金属管3和金属螺母4,橡胶套管2上有一放气孔5。 [0003] It arteriosclerosis detector employed in the bleed air system slow slow exhaust valve is a mechanical exhaust valve, the exhaust valve is also known as rubber, commonly known as "air core" structure shown in Figure 1; it comprises: a housing 1 of plastic, rubber sleeve 2, the metal pipe 3 and the first metal threaded nut 4, the rubber sleeve 5 there is a discharge hole 2. 经过反复验证,发现它存在以下不足: After repeated verification, it was found the following deficiencies:

[0004] ①.机械式慢速排气阀的不稳定性(结构性缺陷),故测量结果有时会不稳定。 [0004] ①. Mechanical instability of the slow exhaust valve (structural defects), so that measurement results may be unstable.

[0005] ②.机械式慢速排气阀所使用的材料是塑料、橡胶和金属,而阀体中的放气孔的大小决定了其放气速度,但是放气孔的大小在产品出厂前已经设定好了,使用者无法改变; 由于阀体材料的线热膨胀系数大、容易氧化等原因,致使放气孔大小发生变化,使得放气速度很不稳定,故整个动脉硬化检测仪放气系统的放气速度难以掌控,致使整个脉搏波形发生变化,导致动脉硬化参数不真实、不精确,甚至无法测量。 [0005] ②. Slow mechanical exhaust valve material used is plastics, rubber and metal, and the size of the bleed hole in the valve body determines its gassing rate, but the bleed hole size has been set in the factory before well set, the user can not change; reasons since the linear thermal expansion coefficient of the valve body material is large, and so is easily oxidized, resulting in a change in the size of the discharge hole, such that the gassing rate is unstable, so that the whole detector arteriosclerosis discharge bleed air system difficult to control the speed of the gas, causing the entire pulse waveform changes, resulting in atherosclerosis parameters untrue, inaccurate, or even can not be measured.

[0006] 在图2中,显示了在温度分别为10°C和50°C时,现有技术中放气系统的放气曲线, 表明了这种机械式慢速排气阀的放气速度受环境温度等影响较大,有时会成倍变化,当通过100°C高温老化后几乎无法使用,使用寿命短。 [0006] In FIG. 2, the deflation curve at each temperature in 10 ° C and 50 ° C, the prior art bleed air system, indicating that the slow speed deflation mechanical exhaust valves influenced by the environmental temperature, the change may be multiplied, when the aging temperature through 100 ° C is almost impossible to use, short service life.

[0007] ③.机械式慢速排气阀的生产成本较高,产品出厂后维护费用较高,同类产品都不同程度的受到上述问题的干扰。 [0007] ③. High mechanical exhaust valve slow production costs, higher cost products manufactured after maintenance, similar products have different degrees of interference problems described above.

发明内容 SUMMARY

[0008] 本发明的目的旨在克服现有技术中的不足,提供一种具有稳定放气系统的动脉硬化检测仪。 [0008] The object of the present invention is intended to overcome the deficiencies of the prior art, to provide a stable gas discharge system having a detector atherosclerosis.

[0009] 本发明的技术方案是: [0009] aspect of the present invention is:

[0010] 一种具有稳定放气系统的动脉硬化检测仪,包括加压微型充气泵、血压袖套、气体压力传感器、慢速排气阀和电磁泄气阀;所述加压微型充气泵输出的压力气体分四路分别送往血压袖套、气体压力传感器、慢速排气阀和电磁泄气阀,所述慢速排气阀由阀体、阀进口连接管和阀出口连接管组成,所述阀体是无机非金属材料制成的毛细管,所述阀进口连接管、阀出口连接管是医用软管。 [0010] bleed air system having a stability detector arteriosclerosis, including a micro air pump pressure, blood pressure cuff, gas pressure sensor, the slow leak valve and a solenoid exhaust valve; pressurizing the micro-output inflator four partial pressure of the gas sent to the blood pressure cuff, respectively, the gas pressure sensor, the slow leak valve and a solenoid exhaust valve, said slow exhaust valve by the valve body, a valve inlet and a valve outlet connection pipe connecting pipe, the the valve body is made of a capillary inorganic material, the inlet valve connection pipe, the valve outlet pipe is connected to medical tubing.

[0011] 所述无机非金属材料是玻璃或陶瓷。 The [0011] inorganic non-metallic material is glass or ceramic.

[0012] 所述玻璃是高硼硅玻璃或石英玻璃。 [0012] The glass is a borosilicate glass or Shi Ying glass.

[0013] 所述医用软管是乳胶管或硅胶管。 The [0013] The medical tube hose latex or silicone tubing.

[0014] 所述慢速排气阀的出口连有电磁泄气阀。 [0014] The slow vent valve outlet is connected with a solenoid release valve.

[0015] 与现有技术相比,本发明的有益效果是: [0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1).采用了本发明的动脉硬化检测仪,其放气系统的放气速度十分稳定,在满足性能和功能的前提下,大大提高了测量结果的真实性和可靠性,同时降低了生产和维护成本,提高了产品的使用寿命; [0016] (1) using a detector according to the present invention is arteriosclerosis, which bleed air bleed system speed is very stable, while meeting performance and functionality, greatly improving the reliability and the authenticity of the measurement results, and reduce production and maintenance costs, improve the life of the product;

[0017] (2).本发明中在慢速排气阀的出口增接了一个电磁泄气阀,能够更精确地控制整个动脉硬化检测仪的工作过程,使得测出的数据更精确和可靠; [0017] (2) In the present invention, the slow exhaust valve outlet connected by a solenoid release valve, to more accurately control operation of the whole process of atherosclerosis detector, such that the measured data more accurate and reliable;

[0018] (3).结构简单,生产加工容易,实用性强。 [0018] (3) of simple structure, easy production and processing, practical.

附图说明 BRIEF DESCRIPTION

[0019] 图1是现有技术中慢速速排气阀结构图; [0019] FIG. 1 is a prior art block diagram of the slow-speed exhaust valve;

[0020] 图2是现有技术中放气系统在10°C和50°C时的放气曲线图; [0020] FIG. 2 is a graph showing a deflated prior art bleed air system at 10 ° C and at 50 ° C;

[0021] 图3是本发明实施例放气系统框图; [0021] FIG. 3 is a system block diagram of an embodiment of the present invention, the discharge gas;

[0022] 图4是本发明中慢速排气阀剖面结构图; [0022] FIG. 4 is a slow exhaust valve of the present invention, a cross-sectional structural view;

[0023] 图5是同等条件下本发明中放气系统的放气曲线与理想的放气曲线比较图; [0023] FIG. 5 is placed in the present invention under the same conditions deflated graph comparing FIG deflation curve over the gas system;

[0024] 图6是本发明中放气系统在10°C、50°C和100°C高温老化24小时后放气曲线图。 [0024] FIG. 6 is a bleed air system of the present invention at 10 ° C, graph deflated after 24 hours 50 ° C and 100 ° C high temperature aging.

[0025] 图中代号含义:1-塑料外壳,2-橡胶套管,3-带螺纹头金属管,4-金属螺母,5-放气孔,6-加压微型充气泵,7-气体压力传感器,8-电磁泄气阀,9-血压袖套,10-慢速排气阀,11-电磁泄气阀,12-阀进口连接管,13-阀体,14-阀出口连接管。 [0025] FIG Code Meaning: 1- plastic, rubber bushing 2-, 3- threaded head of the metal pipe, a metal nut 4-, 5- bleed hole Miniature pressure inflator 6-, 7- gas pressure sensor , the solenoid valve discouraged 8-, 9- blood pressure cuff, 10 slow exhaust valve, the solenoid valve discouraged 11-, 12- valve inlet connection pipe, 13 body, 14 the valve outlet connection pipe.

具体实施方式 detailed description

[0026] 下面结合附图对本发明做进_步的描述。 [0026] The following drawings The present invention will be described in conjunction with steps into _.

[0027] 参见图3、图4 :本具有稳定放气系统的动脉硬化检测仪,包括加压微型充气泵6、 血压袖套9、气体压力传感器7、慢速排气阀10和电磁泄气阀8 ;所述加压微型充气泵6输出的压力气体分四路分别送往血压袖套9、气体压力传感器7、慢速排气阀10和电磁泄气阀8,所述慢速排气阀10由阀体13、阀进口连接管12和阀出口连接管14组成,所述阀体13是用线热膨胀系数很小的高硼硅玻璃制成的玻璃毛细管,所述阀进口连接管12、阀出口连接管14是硅胶管;所述的慢速排气阀10的出口连有电磁泄气阀11。 [0027] Referring to FIG 3, FIG 4: This bleed air system with stable arteriosclerosis detector, including a micro air pump 6 pressure, blood pressure cuff 9, the gas pressure sensor 7, the exhaust valve 10 and slow release valve solenoid 8; the pressurized output of the pump 6 micro inflator gas partial pressure of the blood pressure cuff 9 were sent to four, gas pressure sensor 7, the exhaust valve 10 and the slow leak valve solenoid 8, the slow exhaust valve 10 from the valve body 13, valve inlet and a valve outlet connecting pipe 12 connected to pipe 14 composed of a glass capillary tube of the valve body 13 is a small linear thermal expansion coefficient of borosilicate glass is made, the valve inlet connection pipe 12, the valve outlet tube 14 is connected to silicone tube; outlet of the slow exhaust valve 10 is connected with a solenoid release valve 11.

[0028] 图5中,显示了在同等条件下本发明中放气系统的放气曲线与理想的放气曲线比较图。 [0028] FIG. 5, the bleed air system of the present invention under the same conditions in the gas discharge curve from an ideal curve is relatively deflated FIG. 在具体实施中,所使用的慢速排气阀10的阀体13是通过筛选实验查找到的,即由无机非金属材料_高硼硅玻璃制成的毛细管。 In a particular embodiment, the valve body used in the slow exhaust valve 10, 13 is found by screening experiments, i.e., non-metal inorganic material _ made of borosilicate glass capillary. 由于高硼硅玻璃具有材质稳定,线热膨胀系数很小(接近零),对温度不敏感的特点,非常适用于高精度稳定控制的要求,将这种材质的玻璃毛细管运用到现有的动脉硬化检测仪的放气系统中,使得动脉硬化检测仪的放气系统的放气速度十分稳定,放气曲线受环境温度影响小,放气压力曲线接近理想状态,且十分平滑,没有任何干扰。 Since the borosilicate glass having a high material stability, low coefficient of linear thermal expansion (near zero), not sensitive to temperature characteristics, applications that require very accurate stable control of the glass capillary to the conventional use of this material arteriosclerosis detector bleed air system, the air speed such that the discharge bleed air system of the detector is very stable arteriosclerosis, deflation curve little influence by ambient temperature, the bleed air pressure curve approaches the ideal state, and very smooth, without any interference.

[0029] 图6中,显示本发明中的放气系统在10°C、50°C和100°C高温老化24小时后放气曲线,表明由于高硼硅玻璃毛细管的材料热膨胀系数小,故整个动脉硬化检测仪的放气系统的放气速度变化很微弱,排气气流稳定,温度对测量结果的影响可以忽略不计。 In [0029] Figure 6, in the present invention is the bleed air system at 10 ° C, 50 ° C and 100 ° C high temperature deflation curve aged for 24 hours showed that due to the small thermal expansion coefficient of borosilicate glass capillary tube, so that deflation rate of change throughout the bleed air system arteriosclerosis detector is weak, the exhaust gas flow stability, the effect of temperature on the measurement results can be ignored. [0030] 在测定动脉硬化指标时,首先要求是对一定容积的血压袖套充气,设定压力为ISOmmHg,放气速度要求控制在4mmHg/s左右,根据流体力学中气体在光滑的玻璃毛细管里所受到的沿程阻力与其长度成正比的关系,并通过实验选择内径为0. 03mm,外径为6mm,长度为IOmm的玻璃毛细管做为阀体,选择两节硅胶管做为阀进口连接管12、阀出口连接管14 套在玻璃毛细管的两端。 [0030] In the measurement of arteriosclerosis index, blood pressure cuff is inflated first requirement of a certain volume, set pressure ISOmmHg, controlling deflation speed requirements at 4mmHg / s or so, from hydrodynamic gas in the smooth glass capillary proportional to the relationship between the resistance along the length of the subject, and by selecting the inner diameter of the experiment 0. 03mm, an outer diameter of 6mm, a length of glass capillary IOmm as a valve to select two inlet valve connected to silicone tube as the tube 12, the valve outlet pipe 14 connected to both ends of the sleeve in a glass capillary tube. 毛细玻璃管加工技术非常成熟,故使用玻璃毛细管构成的慢速排气阀10加工也就很容易实现。 Capillary glass tube processing technology is mature, it is processed using a slow exhaust valve 10 of the glass capillary tube constituting it is easy to implement.

[0031 ] 另外,为了更精确控制动脉硬化检测仪的放气,在慢速排气阀的出口连有电磁泄气阀11。 [0031] Further, in order to more precisely control the discharge gas detector arteriosclerosis, in the slow exhaust valve outlet 11 is connected with a solenoid release valve.

[0032] 本发明的工作原理:首先将电磁泄气阀8、电磁泄气阀11关闭,微型充气泵6对血压袖套9充气到一定压力值后停止充气,然后打开电磁泄气阀11,血压袖套9内的气体通过慢速排气阀10和电磁泄气阀11缓慢放出,同时气体压力传感器7采集信号,等到放气到一定压力值时数据采集完成,打开电磁泄气阀8,放掉血压袖套9里面的尾气,工作完毕。 [0032] The working principle of the invention: the first solenoid valve 8 discouraged, the solenoid release valve 11 is closed, the micro pump 6 inflator blood pressure cuff inflated to a certain pressure value 9 to stop inflation, deflation and then opens the solenoid valve 11, the blood pressure cuff 9 by the slow gas in the exhaust solenoid valve 10 and release valve 11 slowly released while the gas pressure sensor signal acquisition 7, until the bleed air pressure to a certain value when data acquisition is completed, opening the electromagnetic valve 8 is discouraged, let go of the blood pressure cuff 9 inside the exhaust, the work is completed.

[0033] 本发明解决了现有动脉硬化检测仪放气系统放气不稳定的问题,使得测量结果的精确性有了很大提高,使得产品的使用寿命也有了很大提高。 [0033] The present invention solves the problems of the prior arteriosclerosis detector deflated bleed air system unstable, so that the accuracy of the measurement results greatly improved, so that the product life has been greatly improved. 本放气系统也适用于示波法测量血压的电子血压计。 This bleed air system is also applicable to electronic sphygmomanometer oscillometric blood pressure measuring method.

Claims (5)

  1. 一种具有稳定放气系统的动脉硬化检测仪,包括加压微型充气泵(6)、血压袖套(9)、气体压力传感器(7)、慢速排气阀(10)和电磁泄气阀(8);所述加压微型充气泵(6)输出的压力气体分四路分别送往血压袖套(9)、气体压力传感器(7)、慢速排气阀(10)和电磁泄气阀(8),其特征在于:所述慢速排气阀(10)由阀体(13)、阀进口连接管(12)和阀出口连接管(14)组成,所述阀体(13)是无机非金属材料制成的毛细管,所述阀进口连接管(12)、阀出口连接管(14)是医用软管。 Bleed air system having a stable arteriosclerosis detector comprises a micro pressure inflator (6), blood pressure cuff (9), a gas pressure sensor (7), the slow exhaust valve (10) and the electromagnetic release valve ( 8); pressurizing the micro inflator (6) the output pressure of the gas sent to the blood pressure cuff, respectively, four points (9), a gas pressure sensor (7), the slow exhaust valve (10) and the electromagnetic release valve ( 8), wherein: the slow exhaust valve (10) by the valve body (13), a valve inlet connection pipe (12) connected to an outlet pipe and a valve (14), with the valve body (13) is an inorganic capillaries are made of non-metallic material, the inlet valve connection pipe (12), connected to the valve outlet pipe (14) is a medical tubing.
  2. 2.根据权利要求1所述的具有稳定放气系统的动脉硬化检测仪,其特征在于:所述无机非金属材料制成的毛细管是玻璃毛细管或陶瓷毛细管。 According to claim bleed air system with stable arteriosclerosis detector of claim 1, wherein: said capillary made of inorganic non-metallic material or a ceramic capillary is a glass capillary.
  3. 3.根据权利要求2所述的具有稳定放气系统的动脉硬化检测仪,其特征在于:所述玻璃毛细管是高硼硅玻璃毛细管或石英玻璃毛细管。 3. The bleed air system with stable arteriosclerosis detector according to claim 2, wherein: said glass capillary tube is a borosilicate glass or Shi Ying glass capillary capillaries.
  4. 4.根据权利要求1所述的具有稳定放气系统的动脉硬化检测仪,其特征在于:所述医用软管是乳胶管或硅胶管。 4. The bleed air system with stable arteriosclerosis detector according to claim 1, wherein: the medical tube hose latex or silicone tubing.
  5. 5.根据权利要求1所述的具有稳定放气系统的动脉硬化检测仪,其特征在于:所述慢速排气阀(10)的出口连有电磁泄气阀(11)。 5. The detector of claim 1 arteriosclerosis stable bleed system according to claim, wherein: the slow exhaust valve (10) outlet is connected with a solenoid release valve (11).
CN 201010176129 2010-05-14 2010-05-14 Atherosclerosis detector with stable deflation system CN101843479A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102564619A (en) * 2011-11-23 2012-07-11 南京化工职业技术学院 Reducing and corrosive gas temperature measurement device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567899A (en) * 1984-07-30 1986-02-04 Healthcheck Corporation Cuff pressure controller for blood pressure measurement apparatus
JP2615858B2 (en) * 1988-06-06 1997-06-04 オムロン株式会社 Electronic sphygmomanometer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567899A (en) * 1984-07-30 1986-02-04 Healthcheck Corporation Cuff pressure controller for blood pressure measurement apparatus
JP2615858B2 (en) * 1988-06-06 1997-06-04 オムロン株式会社 Electronic sphygmomanometer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102564619A (en) * 2011-11-23 2012-07-11 南京化工职业技术学院 Reducing and corrosive gas temperature measurement device

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