CN103432653A

CN103432653A - Transfusion droplet detection method

Info

Publication number: CN103432653A
Application number: CN2013104126184A
Authority: CN
Inventors: 李益民
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-06
Filing date: 2013-09-06
Publication date: 2013-12-11

Abstract

The invention discloses a transfusion droplet detection method comprising the following steps: a parallel metal polar plate capacitor is clamped at the outside of a transfusion apparatus drip chamber, and the clamped position of the transfusion apparatus drip chamber is extruded to a special shape, and then, the capacitance of the capacitor is continuously measured and analyzed through a capacitance measuring unit and a microprocessor MCU (Microprogrammed Control Unit), when one droplet penetrates through the two polar plates of the capacitor, the capacitance of the capacitor generates a pulse mutation, one droplet is detected once obtaining the pulse mutation, and the pulse period corresponds to the transfusion dropping speed period. The transfusion droplet detection method disclosed by the invention is safe, reliable, small, low-consumption, anti-interference and suitable for various types of transfusion apparatuses in the whole world, and the following defects of the existing light sensitive detection technology are overcome: susceptibility to external light interference, susceptibility to interference of drip chamber inclination and wall hanging mist, stimulation of irradiation on liquid medicine, non-suitability for shading transfusion, large power consumption, large volume and inconvenience for operation.

Description

The infusion liquid drop detection method

Technical field

The present invention relates to the electron medical treatment technical field, relate in particular to a kind of infusion liquid drop detection method.

Background technology

Venous transfusion is a kind of medical procedure of extensive use, dripping speed is a very important professional parameter in transfusion, a lot of class sufferers have strict requirement as old people, child, cardiovascular lung sufferer, tumor patient and multiple special medicinal liquid to transfusion drip speed, if dripping the speed variation in infusion process exceeds standard, just may bring adverse consequences, even make patient's death of fainting when serious, so that monitoring transfusion drips speed is extremely important, fastly just must be surveyed infusion liquid drop and want monitoring transfusion to drip.

In world wide, current existing infusion liquid drop detection method is mainly that Photoinduction type is surveyed, place a pair of infrared electro T-R tube in the infusion unit titrimeter both sides, utilize in the lower process of drop light is formed to the principle of blocking decay, obtain one group and a fast synperiodic pulse signal, and then monitored dripping speed.But the method has the following disadvantages: the safety of irradiation at short distance medicinal liquid leaves a question open; Dropping funnel is afraid of to rock inclination, because this easily causes drop depart from the flash ranging passage and cause undetected; Be unsuitable for photophobism transfusion, the especially extremely low light proofing infusion apparatus of some light transmittances; Extraneous natural artificial light rays easily disturbs surveying to form; In order to place optoelectronic transceivers, dropping funnel must be wrapped up, this can hinder operation and observe; Because of the continuous emission of light of need, power consumption is larger.

Reference paper 1 (CN102526837A) has disclosed a kind of brand-new non-Photoinduction type drop detection method, the method has overcome many defects of Photoinduction type Detection Techniques described in [0003], but the method has two deficiencies: in the disposable transfusion device of producing in the world, it is that infusion unit titrimeter directly punctures and is connected in the medicine bottle medicated bag that one class is arranged, be that the dropping funnel top does not have flexible pipe, do not have flexible pipe naturally just can't press from both sides attached detecting devices, thereby make the described method of reference paper 1 be difficult to realize; Reference paper 1 need to compare careful extruding adjustment to liquid level in dropping funnel, and this has increased operation easier to a certain extent.

Summary of the invention

Technical problem to be solved by this invention is: a kind of novel infusion liquid drop detection method is provided, and the method should overcome all defect of current Photoinduction type Detection Techniques; Can be applicable to again all kinds of transfusion devices in the world; Operation also must be simple and direct; Also to there are safe and reliable, the characteristics such as accuracy is high, small and exquisite low-power consumption, anti-all kinds of interference.

In order to solve the problems of the technologies described above, the present invention has adopted a kind of infusion liquid drop detection method, described method comprises: a parallel metal plates capacitance folder is attached to the infusion unit titrimeter outside, and the quilt of infusion unit titrimeter is pressed from both sides to the crimp of attached position to given shape, then with a capacitance measurement unit and Micro-processor MCV, the appearance value of this electric capacity is carried out to the continuous measurement analysis, in the time of between a dropping liquid drips through the electric capacity two-plate, a kind of pulsed sudden change can occur in the capacitance of described electric capacity, just show to detect a dropping liquid and drip whenever survey obtains once the sudden change of above-mentioned pulsed, and the cycle of pulse just corresponding drip the speed cycle.

Further, in order to make can be under current conditions accurate feasible the realization of this method, the signal to noise ratio (be the intensity of intensifier pulse sudden change) of while in order to improve ranging pulse formula jump signal, this electric capacity is the parallel metal plates capacitance, between two-plate, distance is 6mm, and the capacitor plate size is long is 8mm (this value is preferred value) for 22mm is wide.

Further, described plasticity infusion unit titrimeter is pressed from both sides to attached part sidewall crimp by metal polar plate, make in its rectangle frame scope that enters a spacing 6mm who is surrounded by described metal polar plate.

Further, described capacitance measurement unit is carried out continuous measurement to electric capacity, and the capacitance value data that the series recorded is comprised to pulse characteristics passes to Micro-processor MCV analyzed, judges, processes, every survey obtains a capacitance pulse signal and just shows to have detected a drops physic liquor.

Further, Micro-processor MCV calculates the cycle that extracts pulse from the capacitance value data that comprises pulse characteristics, this pulse period is the cycle of transfusion drip speed namely, this cycle (unit second) is got to inverse and be multiplied by 60 again, just obtains the medical transfusion Common Parameters---drip/minute.

The accompanying drawing explanation

Fig. 1 is circuit theory diagrams of the present invention (drop not yet drips while entering between metal polar plate).

Fig. 2 is circuit theory diagrams of the present invention (when drop falls between metal polar plate).

Fig. 3 is circuit theory diagrams of the present invention (when droplets fall is left between metal polar plate).

Fig. 4 is that capacitance of the present invention constantly drips and produces recurrent pulses formula sudden change schematic diagram with drop.

Fig. 5 is parallel metal plates capacitance schematic diagram of the present invention.

The specific embodiment

The invention provides a kind of infusion liquid drop detection method, taked a less parallel metal plates capacitance folder of polar plate spacing is attached to the infusion unit titrimeter outside, utilize metal polar plate that the quilt of infusion unit titrimeter is pressed from both sides to the crimp of attached position to given shape simultaneously, then with a capacitance measurement unit and Micro-processor MCV, the appearance value of this electric capacity is carried out to the continuous measurement analysis, when a droplets fall is passed between the electric capacity two-plate, a kind of pulsed sudden change can occur in the capacitance of described electric capacity, relies on survey to obtain above-mentioned pulsed sudden change and just can realize the detection to drop.

With reference to figure 1, this figure is circuit theory diagrams of the present invention, comprise a folder be attached to the parallel metal plates capacitance 10 of dropping funnel 41 both sides (polar plate spacing 6mm), be electrically connected on its capacitance of metal polar plate capacitance measurement capacitance measurement unit 20, be electrically connected on capacitance measurement unit 20 and measurement data carried out to the Micro-processor MCV 30 of analyzing and processing.Separately as seen from Figure 1, the top of dropping funnel 41 has been entered in the rectangle frame scope of a wide 6mm by 10 crimps of metal polar plate electric capacity.

With reference to figure 1, reason because of surface tension of liquid, drop 40 also continues to assemble swell and not yet drips at drip 43 places, now the electrolyte between electric capacity 10 pole plates only has dropping funnel wall and the air of two-layer plastic material, and the capacitance that at this moment capacitance measurement unit 20 records is a relatively level and smooth stable value.

With reference to figure 2, because surface tension of liquid is ball gravitation insuperably finally, now drop 40 drips rapidly and enters between electric capacity 10 pole plates downwards, electrolyte between this electric capacity 10 pole plates has increased again by a drop of liquid moment except the dropping funnel wall of original two-layer plastic material and air, this change can make the capacitance of electric capacity 10 that a kind of pulsed sudden change (relatively becoming large) occurs, a kind of pulsed sudden change now also can synchronously occur in capacitance measurement unit 20 measured values accordingly, as long as Measurement and analysis goes out this pulsed sudden change, just can carry out real-time detection accurately to drop.

With reference to figure 3, now drop 40 continues fall and leave between electric capacity 10 pole plates, situation got back to again with Fig. 1 in similar, be dropping funnel wall and the air that electrolyte between electric capacity 10 pole plates only has two-layer plastic material, the capacitance that at this moment capacitance measurement unit 20 records is a relatively level and smooth stable value.

With reference to figure 4, along with drop constantly repeats drippage, capacitance measurement unit 20 can measure one group of capacitance curve as shown in Figure 4, a pulse in this capacitance curve is a just corresponding drop drippage, interval T between adjacent pulse is exactly to drip the fast cycle, T gets inverse and is multiplied by 60 again and just can obtains transfusion drip speed (drip/minute), and capacitance measurement unit 20 and Micro-processor MCV 30 these data of continuous measurement analytical calculation, just can survey also and can obtain real-time transfusion drip speed drop.

With reference to figure 2, Fig. 5, because the volume of a drop is very little, when it, to enter the electric capacity sudden change value caused between capacitor plate also very little, if this sudden change value approaches environment and interference noise, that scheme just at all can't be practical.For the present invention can be realized in practice accurately and effectively, the present invention has adopted the parallel metal plates capacitance 10 that a kind of polar plate spacing is less, shape is fixing, its polar plate spacing 6mm, the wide 8mm of the long 22mm of pole plate, the distortion of the upper compressive of infusion unit titrimeter is inserted in this rectangle frame surrounded by the parallel metal pole plate simultaneously, just can be caused also better electric capacity sudden change value of a more obvious more greatly signal to noise ratio at drop 40 through time between pole plate like this.In order to differentiate better entering and leaving of drop, the top edge 11 of metal polar plate should be greater than 6mm apart from transfusion device drip 43 in addition, and in dropping funnel, liquid level 42 should be lower than the lower limb 12 of metal polar plate.

The above is the specific embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvement, amplification and retouching; such as the metal polar plate size value to definition in [0022], change among a small circle etc., these improvement, amplification and retouching also are considered as protection scope of the present invention.

Claims

1. an infusion liquid drop detection method, described method comprises: a parallel metal plates capacitance folder is attached to the infusion unit titrimeter outside, and the quilt of infusion unit titrimeter is pressed from both sides to the crimp of attached position to given shape, then with a capacitance measurement unit and Micro-processor MCV, the appearance value of this electric capacity is carried out to the continuous measurement analysis, in the time of between a dropping liquid drips through the electric capacity two-plate, a kind of pulsed sudden change can occur in the capacitance of described electric capacity, just show to detect a dropping liquid and drip whenever survey obtains once the sudden change of above-mentioned pulsed, and the cycle of pulse just corresponding drip the speed cycle.

2. the method for claim 1, it is characterized in that, for this method can be realized under current conditions, the signal to noise ratio (be the intensity of intensifier pulse sudden change) of while in order to improve ranging pulse formula jump signal, described electric capacity is the parallel metal plates capacitance, and between two-plate, distance is 6mm.

3. the method for claim 1, is characterized in that, described infusion unit titrimeter is pressed from both sides to attached part sidewall crimp by metal polar plate, makes in its rectangle frame scope that enters a spacing 6mm who is surrounded by described metal polar plate.

4. the method for claim 1, is characterized in that, described capacitor plate size is long is 22mm, and wide is 8mm.

5. the method for claim 1, is characterized in that, the top edge of metal polar plate is greater than 6mm apart from the transfusion device drip.

6. the method for claim 1, is characterized in that, in dropping funnel, liquid level should be lower than the lower limb of metal polar plate.