CN105214170A - A kind of transfusion drip speed testing circuit - Google Patents
A kind of transfusion drip speed testing circuit Download PDFInfo
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- CN105214170A CN105214170A CN201410226692.1A CN201410226692A CN105214170A CN 105214170 A CN105214170 A CN 105214170A CN 201410226692 A CN201410226692 A CN 201410226692A CN 105214170 A CN105214170 A CN 105214170A
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Abstract
The present invention is applicable to medical domain, provides a kind of transfusion drip speed testing circuit.The infrared transmitter of array arrangement, the infrared remote receiver of array arrangement, transfusion drip tube is arranged between this infrared transmitter and this infrared remote receiver; This infrared transmitter sends infrared signal to detect the drop fallen in transfusion drip tube with assigned frequency to this infrared remote receiver; This infrared remote receiver generates dropping liquid signal when detecting the drop fallen in transfusion drip tube, exports this dropping liquid signal; Demodulation by filter circuit receives this dropping liquid signal, carries out matching demodulation and generates square-wave signal, export this square-wave signal to the dropping liquid signal received with this assigned frequency; The square-wave signal that this demodulation by filter circuit exports is adjusted to the square-wave signal of preset rules by this logic conversion circuit, the square-wave signal of this preset rules is exported, to make this control module according to the square-wave signal determination transfusion drip speed of this preset rules to this control module.Also accurately transfusion drip speed can not be detected by the interference of natural light.
Description
Technical field
The invention belongs to medical domain, particularly relate to a kind of transfusion drip speed testing circuit.
Background technology
At present, medical worker is when applying drop technique treatment patient, usually the liquid droping speed in Murphy type burette is with the naked eye watched, artificial adjustment is positioned at the flow control valve on the tube for transfusion of Murphy type burette lower end, increase or reduce the fluid flow of this tube for transfusion, and then adjust the liquid droping speed in this Murphy type burette.
In addition, prior art also has the liquid droping speed detected by the mode such as to take pictures in Murphy type burette, but these prior aries all cannot the interference of the light such as filtering natural light, causes testing result inaccurate, cannot be applicable to the adverse circumstances such as high light or half-light.
Summary of the invention
The object of the present invention is to provide a kind of transfusion drip speed testing circuit, be intended to solve prior art detect in transfusion drip tube drip speed time, be subject to natural light impact, cause the inaccurate problem of testing result.
On the one hand, a kind of transfusion drip speed testing circuit, the external control module of described transfusion drip speed testing circuit; Described transfusion drip speed testing circuit comprises: the infrared transmitter of array arrangement, the infrared remote receiver of array arrangement, and transfusion drip tube is arranged between described infrared transmitter and described infrared remote receiver;
Described transfusion drip speed testing circuit also comprises demodulation by filter circuit and logic conversion circuit; Described demodulation by filter circuit has infrared input and square wave outfan, and infrared remote receiver described in the infrared input termination of described demodulation by filter circuit, between the square wave outfan that described logic conversion circuit is connected to described demodulation by filter circuit and described control module;
Wherein, described infrared transmitter sends infrared signal with assigned frequency to described infrared remote receiver, to detect the drop fallen in transfusion drip tube;
Wherein, described infrared remote receiver is used for: generating dropping liquid signal when detecting the drop fallen in transfusion drip tube, exporting described dropping liquid signal to described transfusion drip speed testing circuit;
Wherein, described demodulation by filter circuit is used for: receive described dropping liquid signal from described infrared input, carries out matching demodulation and generates square-wave signal, export described square-wave signal from described square wave outfan to the dropping liquid signal received with described assigned frequency;
Wherein, described logic conversion circuit is used for: the square-wave signal square-wave signal that described demodulation by filter circuit exports being adjusted to preset rules, the square-wave signal of described preset rules is exported, to make described control module according to the square-wave signal determination transfusion drip speed of described preset rules to described control module.
The invention has the beneficial effects as follows: use the infrared signal of assigned frequency to detect the drop fallen in transfusion drip tube, the impact of natural light can be avoided; Whether in addition, the dropping liquid signal that demodulation by filter circuit exports for infrared remote receiver carries out matching detection with assigned frequency, can the interference of filtering natural light further, realize receiving the accurate judgement of infrared signal and generate square-wave signal.In addition, judging in transfusion drip tube, whether to there is the drop fallen to improve control module, further by logic conversion circuit, square-wave signal can be adjusted to the square-wave signal of the described preset rules being convenient to control module identification.Like this, not by under the interference of natural light, the number (transfusion drip speed) of the drop fallen in transfusion drip tube in the unit interval can accurately be detected.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the first structure chart of the transfusion drip speed testing circuit that the embodiment of the present invention provides;
Fig. 2 is the first composition structure chart of demodulation by filter circuit 1;
Fig. 3 is the second composition structure chart of demodulation by filter circuit 1;
Fig. 4 is the third composition structure chart of demodulation by filter circuit 1;
Fig. 5 is the second structure chart of the transfusion drip speed testing circuit that the embodiment of the present invention provides;
Fig. 6 is the physical circuit figure comprising matching demodulation circuit 13 and buffer circuit 15;
Fig. 7 is the third structure chart of the transfusion drip speed testing circuit that the embodiment of the present invention provides.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In order to technical solutions according to the invention are described, be described below by specific embodiment.
First, the basic structure composed that the transfusion drip speed testing circuit that illustratively embodiment of the present invention provides has; Wherein, shown the first structure of the transfusion drip speed testing circuit that the embodiment of the present invention provides by Fig. 1, for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
The transfusion drip speed testing circuit that the embodiment of the present invention provides, as shown in Figure 1, the external control module 5 of described transfusion drip speed testing circuit; Described transfusion drip speed testing circuit comprises: the infrared transmitter 4 of array arrangement, the infrared remote receiver 3 of array arrangement, and transfusion drip tube is arranged between described infrared transmitter 4 and described infrared remote receiver 3.In the present embodiment, infrared transmitter 4 described in array arrangement is the emission angles in order to increase infrared signal, and in like manner, infrared remote receiver 3 described in array arrangement is the receiving angles in order to increase infrared signal.Transfusion drip tube is being arranged on after between described infrared transmitter 4 and described infrared remote receiver 3, as long as there is the transmission of liquid droplets intercept infrared signal, the corresponding infrared remote receiver 3 receiving this infrared signal does not just collect infrared signal, completes the detection of dripping a dropping liquid; Like this, continue to use all infrared remote receivers 3 to carry out the collection of infrared signal, as long as certain infrared remote receiver 3 detects drop, this infrared remote receiver 3 will export the low level pulse of a band burr, and this infrared remote receiver 3 can export to transfusion drip speed testing circuit the low level pulse that this treats burr simultaneously; Thus pass through the infrared remote receiver 3 of this array arrangement, the detection range of drop can be increased, even if transfusion drip tube rocks in proper range, also can realize the detection to this drop.Like this, along with the lasting drippage of drop in transfusion drip tube, carry out drop detection by this infrared remote receiver 3, this infrared remote receiver 3 detects the electric described dropping liquid signal containing the pulse signal of band burr to lasting output packet to transfusion drip speed.
Wherein, described infrared transmitter is used for: send infrared signal with assigned frequency to described infrared remote receiver, to detect the drop fallen in transfusion drip tube; Described infrared remote receiver is used for: generating dropping liquid signal when detecting the drop fallen in transfusion drip tube, exporting described dropping liquid signal to described transfusion drip speed testing circuit.In the present embodiment, in order to the drop realized falling in transfusion drip tube accurately detects, avoid the interference of visible ray further, oscillating circuit (as self-maintained circuit) is adopted to generate the signal of assigned frequency, use this assigned frequency to modulate constant infrared signal, generate the infrared signal with this assigned frequency; When the drop fallen in transfusion drip tube detects, the infrared transmitter for array arrangement loads the infrared signal of this assigned frequency, and infrared transmitter launches the infrared signal of this assigned frequency to infrared remote receiver.It should be noted that, select assigned frequency modulated red external signal, be identify infrared signal the signal in order to export from infrared remote receiver better, avoid the interference of visible ray.As a preferred implementation, this assigned frequency selected is 6.7KHZ.
It should be noted that, because the drop fallen in transfusion drip tube can stop the reception of infrared remote receiver 3 pairs of infrared signals, thus low level pulse signal can be comprised accordingly in dropping liquid signal.Thus the dropping liquid signal that described infrared remote receiver 3 exports has two frequencies, and these two frequencies are the frequency (i.e. transfusion drip speed) that this assigned frequency and dropping liquid fall.
For the drop realized further falling in transfusion drip tube accurately detecting, not only using the infrared signal with assigned frequency to detect drop, also with the addition of demodulation by filter circuit 1 and logic conversion circuit 2 at described transfusion drip speed testing circuit.Particularly, described transfusion drip speed testing circuit also comprises demodulation by filter circuit 1 and logic conversion circuit 2; Described demodulation by filter circuit 1 has infrared input and square wave outfan, infrared remote receiver 3 described in the infrared input termination of described demodulation by filter circuit 1, between the square wave outfan that described logic conversion circuit 2 is connected to described demodulation by filter circuit 1 and described control module 5.Wherein, described demodulation by filter circuit 1 for: receive described dropping liquid signal from described infrared input, with described assigned frequency, matching demodulation carried out to the dropping liquid signal received and generates square-wave signal, exporting described square-wave signal from described square wave outfan; Wherein, described logic conversion circuit 2 is for the square-wave signal that the square-wave signal that described demodulation by filter circuit 1 exports is adjusted to preset rules, the square-wave signal of described preset rules is exported, to make described control module 5 according to the square-wave signal determination transfusion drip speed of described preset rules to described control module 5.
Particularly, described infrared remote receiver 3 continues to detect the drop that falls in transfusion drip tube and generates described dropping liquid signal (this dropping liquid signal has the frequency (i.e. transfusion drip speed) that this assigned frequency and dropping liquid fall), and the dropping liquid signal of generation is exported to demodulation by filter circuit 1.And then when using assigned frequency to carry out matching demodulation, can obtain described square-wave signal, this square-wave signal only has the frequency (i.e. transfusion drip speed) that this dropping liquid falls.In the present invention one preferred implementation, demodulation by filter circuit 1, when carrying out matching demodulation to infrared signal with assigned frequency, carries out attenuation processing to frequency more than this assigned frequency.
For the square-wave signal that described demodulation by filter circuit 1 exports, this square-wave signal only has the frequency (i.e. transfusion drip speed) that dropping liquid falls); But for control module 5 can be accurately identified each square wave in each square-wave signal to identify this transfusion drip speed further, for the described square-wave signal that described demodulation by filter circuit 1 exports from described square wave outfan, adjust the square-wave signal of described demodulation by filter circuit 1 output according to preset rules further by logic conversion circuit 2.Export the square-wave signal meeting preset rules to described control module 5, be convenient to control module 5 and accurately judge whether have drop to fall in transfusion drip tube, control module 5 determines the transfusion drip speed in transfusion drip tube then according to this preset rules.Described transfusion speed is: in the unit interval, the number that in transfusion drip tube, drop falls.
Fig. 2 shows the first composition structure of demodulation by filter circuit 1, for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
As one embodiment of the invention, as shown in Figure 2, described demodulation by filter circuit 1 comprises the block isolating circuit 11, low-pass filter circuit 12 and the matching demodulation circuit 13 that connect successively; Wherein, described block isolating circuit 11 for: filtering from the DC component the dropping liquid signal that described infrared input receives; Wherein, described low-pass filter circuit 12 for: low-pass filtering is carried out with the HF noise signal of filtering higher than described assigned frequency to the dropping liquid signal after filtering DC component; Wherein, described matching demodulation circuit 13 for: the coupling of the dropping liquid signal after low-pass filtering being carried out to described assigned frequency is screened and generates square-wave signal.
In the present embodiment, isolated the flip-flop in the dropping liquid signal of described infrared remote receiver 3 detection output in advance by block isolating circuit 11, be convenient to carry out frequency demodulation to infrared signal.In the present invention one preferred implementation, buffer circuit uses mutual inductor and peripheral circuit to realize.In the present invention one preferred implementation, buffer circuit uses capacitance to be connected between infrared remote receiver 3 and low-pass filter circuit 12 and realizes.In the present invention one preferred implementation, the isolation capacitance of series connection and amplifying circuit is adopted to realize, not only can flip-flop in filtering dropping liquid signal, isolation can also be carried out to the dropping liquid signal of filtering flip-flop to amplify, be convenient to matching demodulation circuit 13 and correctly detect assigned frequency, carry out correct coupling screening with the dropping liquid signal after matching demodulation circuit 13 pairs of low-pass filtering with this assigned frequency.
Another for the object of adding low-pass filter circuit 12 in described demodulation by filter circuit 1, be in order to: filtering is higher than the HF noise signal of described assigned frequency, retain described assigned frequency, and retain the frequency (i.e. transfusion drip speed) fallen lower than this dropping liquid of described assigned frequency.Avoid after carrying out signal amplification to this HF noise signal, this HF noise signal after amplification easily damages electronic devices and components, especially transistor.
Fig. 3 shows the second composition structure of the demodulation by filter circuit 1 that the embodiment of the present invention provides, and for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
In an embodiment of the present invention, in order to ensure that matching demodulation circuit 13 carries out assigned frequency safely and carries out matching demodulation, the HF noise signal higher than described assigned frequency is filtered out in advance; But the signal amplitude of the dropping liquid signal after low-pass filtering is less, therefore signal amplification circuit 14 is added in the described demodulation by filter circuit 1 provided at the present embodiment, as shown in Figure 3, described signal amplification circuit 14 is connected between described low-pass filter circuit 12 and described matching demodulation circuit 13; Wherein, described signal amplification circuit 14 for: to the dropping liquid signal after low-pass filtering carry out preset multiple signal amplify.It should be noted that, described preset multiple desirably goes out the degree of accuracy of transfusion drip speed from dropping liquid signal with assigned frequency matching demodulation and determines.In an embodiment of the present invention, demodulation by filter circuit 1 also comprises a base modules, this base modules provides reference signal for signal amplification circuit 14, dropping liquid signal after described low-pass filtering compares with this reference signal by signal amplification circuit 14, and the signal signal compared being carried out to preset multiple amplifies.It is emphasized that, according to the voltage swing of the dropping liquid signal that infrared remote receiver receives, adjust the voltage swing of the reference signal that this base modules exports, the dropping liquid signal obtained to make signal amplification circuit 14 use this reference signal to compare and enlarge to the dropping liquid signal after described low-pass filtering is stable (namely having the dropping liquid signal of constant amplitude), be convenient to matching demodulation circuit 13 like this and accurately can carry out matching demodulation with described assigned frequency to stable dropping liquid signal, the square-wave signal that matching demodulation goes out also is stable.
In a preferred embodiment, enough can amplify the dropping liquid signal after low-pass filtering to meet signal amplification circuit 14, be amplified to the dropping liquid signal of preset multiple, described signal amplification circuit 14 is one or more levels amplifying circuit.Preferably, between every two-stage amplifying circuit, also added signal isolation circuit, the dropping liquid signal avoiding rear class amplifying circuit to export is counter pours into preamplifying circuit, burns preamplifying circuit.
Fig. 4 shows the third composition structure of the demodulation by filter circuit 1 that the embodiment of the present invention provides, and for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
In a preferred embodiment, as shown in Figure 4, described demodulation by filter circuit 1 also comprises buffer circuit 15, between the matching demodulation circuit 13 that described buffer circuit 15 is connected to described demodulation by filter circuit 1 and described logic conversion circuit 2; Wherein, described buffer circuit 15 for: impedance isolation and/or signal isolation are carried out to the square-wave signal that described matching demodulation circuit 13 exports, export the square-wave signal after isolation to described logic conversion circuit 2.
In the present embodiment, in order to ensure that logic conversion circuit 2 can receive correct square-wave signal, especially in order to isolate the square-wave signal that matching demodulation circuit 13 exports, ensure that the square-wave signal entering logic conversion circuit 2 is undeformed, between the matching demodulation circuit 13 and described logic conversion circuit 2 of described demodulation by filter circuit 1, with the addition of buffer circuit 15.The optimal way of described buffer circuit 15 is: the buffer circuit including current transformer composition, or the buffer circuit etc. including photoelectrical coupler composition.
Fig. 5 shows the second structure of the transfusion drip speed testing circuit that the embodiment of the present invention provides, and for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
On the basis of above-described embodiment, as one embodiment of the invention, as shown in Figure 5, described transfusion drip speed testing circuit also comprises gain regulating circuit 6; Described gain regulating circuit 6 has the first regulation and control end ctrl1 and second regulation and control end ctrl2, and described first regulation and control end ctrl1 and described second regulation and control end ctrl2 correspondence connect described matching demodulation circuit 13 and described logic conversion circuit 2; Wherein, described gain regulating circuit 6 for: adjust the amplitude of square-wave signal that described matching demodulation circuit 13 exports, adjust the amplitude of the square-wave signal of the described preset rules that described logic conversion circuit 2 exports.
In the present embodiment, judge to improve buffer circuit further the square-wave signal that matching demodulation circuit 13 exports, the amplitude used during square-wave signal described in the amplitude used when described matching demodulation circuit 13 exports square-wave signal and described isolation circuitry senses all obtains from the first regulation and control end ctrl1 of described gain regulating circuit 6.
In addition, judge the square-wave signal of the described preset rules that described logic conversion circuit 2 exports to improve control module 5, the amplitude that the square-wave signal that described logic conversion circuit 2 exports described preset rules uses obtains from the second regulation and control end ctrl2 of described gain regulating circuit 6.
Fig. 6 shows the physical circuit of matching demodulation circuit 13 and the physical circuit of buffer circuit 15, for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
In a preferred embodiment, as shown in Figure 6, described matching demodulation circuit 13 comprises: matching demodulation chip U1, the first electric capacity C1, the first resistance R1 and described buffer circuit;
The first end of described first electric capacity C1 and the second end correspondence meet the input pin IM of described low-pass filter circuit 12 and described matching demodulation chip U1, the first end of described first resistance R1 and the second end correspondence meet the output pin OUT of the first regulation and control end ctrl1 and described matching demodulation chip U1 of described gain regulating circuit 6, and the output pin OUT of described matching demodulation chip U1 connects described buffer circuit.
In the present embodiment, the mid frequency of matching demodulation chip U1 is preset for this assigned frequency.
Thus, during dropping liquid signal after low-pass filter circuit 12 exports from low-pass filtering to matching demodulation circuit 13, matching demodulation circuit 13 carries out every direct receipts by the first electric capacity C1 to the dropping liquid signal after this low-pass filtering, and matching demodulation chip U1 receives the dropping liquid signal after straight from input pin IM; Dropping liquid signal after straight mates with this assigned frequency that the present embodiment uses by matching demodulation chip U1, as long as match this assigned frequency that the present embodiment uses, then output low level.Because the drop fallen in transfusion drip tube can block the infrared signal that infrared remote receiver 3 receives infrared transmitter 4 transmitting, therefore, this dropping liquid signal also has the frequency (i.e. transfusion drip speed) that dropping liquid falls, the frequency fallen due to this dropping liquid is much smaller than this assigned frequency, matching demodulation chip U1 can not match this assigned frequency, when matching demodulation chip U1 does not match this assigned frequency, matching demodulation chip U1 can export high level.Like this, as long as the drop fallen in transfusion drip tube detected, matching demodulation chip U1 will export the square wave of a high level from output pin OUT.Like this, continue to detect in transfusion drip tube have drop to drip time, matching demodulation chip U1 will export from output pin OUT have the square-wave signal of the frequency (i.e. liquid droping speed) that this drop falls.
It should be noted that, in order to ensure that logic conversion circuit 2 correctly can detect each square wave in the square-wave signal that matching demodulation chip U1 exports, the amplitude of each square wave in the square-wave signal export matching demodulation chip U1 is unified to be set to: the magnitude of voltage that gain regulating circuit 6 is provided from the first regulation and control end ctrl1 by the first resistance R1 (pull-up resistor).
In the present invention one preferred implementation, select LM567 as matching demodulation chip U1.In advance by the resistance of LM567 periphery and the mid frequency of capacitance settings LM567, the mid frequency set is as this assigned frequency.Like this, as long as the drop fallen in transfusion drip tube detected, LM567 will not detect infrared signal suddenly, exports the square wave of a high level from output pin OUT.Like this, continue to detect in transfusion drip tube have drop to drip time, LM567 will export from output pin OUT have the square-wave signal of the frequency (i.e. liquid droping speed) that this drop falls.
In a preferred embodiment, as shown in Figure 6, described buffer circuit 15 comprises: optical coupling chip U2, the second resistance R2 and the 3rd resistance R3;
The high level input of described optical coupling chip U2, low level input, high level output end and low level output end correspondence connects second end of described second resistance R2, the output pin of described matching demodulation chip U1, described logic conversion circuit 2 and ground, first regulation and control end ctrl1 of gain regulating circuit 6 described in first termination of described second resistance R2, the first end of described 3rd resistance R3 and the second end correspondence connect the high level output end of the first regulation and control end ctrl1 and optical coupling chip U2 of described gain regulating circuit 6.
In the present embodiment, in order to ensure that optical coupling chip U2 only realizes impedance isolation and signal isolation, and one or more square waves that can not increase or remove in square-wave signal (square-wave signal that matching demodulation chip U1 exports), the high level input of optical coupling chip U2 meets the first regulation and control end ctrl1 of gain regulating circuit 6 by the second resistance R2, meanwhile, the high level output end of optical coupling chip U2 meets the first regulation and control end ctrl1 of gain regulating circuit 6 by the 3rd resistance R3.
Fig. 7 shows the third composition structure of the transfusion drip speed testing circuit that the embodiment of the present invention provides, and for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
In an embodiment of the present invention, as shown in Figure 7, described transfusion drip speed testing circuit also comprises motor, and described motor is electrically connected with described control module 5; Described control module 5 for: determine the described transfusion drip speed in described transfusion drip tube according to the square-wave signal of described preset rules, the speed calculating described transfusion drip speed and described default speed is poor, generate flow adjustment instruction according to described speed difference, export described flow adjustment instruction to described motor; Described motor is used for: the flow adjustment instruction adjustment flow control valve exported according to described control module 5, with the fluid flow flow through in tube for transfusion by the adjustment of described flow control valve.
In the present embodiment, because transfusion drip speed (the drop number fallen within the unit interval in transfusion drip tube) and the fluid flow flowing through tube for transfusion are positively related.Therefore, whether suitable in order to judge the fluid flow (for patient infusion) flow through in tube for transfusion, by judge transfusion drip speed whether with carry out described presetting and drip a fast equal realization, can find out, describedly to determine when to preset that to drip speed be fluid flow in tube for transfusion be suitable.If transfusion drip speed is greater than described presetting drip speed, then represent the fluid flow flowing through tube for transfusion excessive, then control module 5 generates the flow adjustment instruction (the flow adjustment instruction of this reduction flow is dripped the dripping speed difference of speed according to described transfusion drip speed and described presetting and determined) reducing flow, adjusts by the flow of this reduction flow the step motion control that instruction control step motor carries out small step-length; Because flow control valve is driven by this motor, flow control valve is driven to reduce the fluid flow flow through in tube for transfusion when motor receives the flow adjustment instruction reducing flow.In like manner, if transfusion drip speed is less than described presetting drip speed, then represent the fluid flow flowing through tube for transfusion too small, the flow adjustment instruction (the flow adjustment instruction of this augmented flow is dripped the dripping speed difference of speed according to described transfusion drip speed and described presetting and determined) that then control module 5 generates augmented flow and sends to motor, and when the flow that motor receives augmented flow adjusts instruction, drive flow control valve increases the fluid flow flow through in tube for transfusion.
In an embodiment of the present invention, described control module 5 also for: when the described transfusion drip speed in the described transfusion drip tube determined according to the square-wave signal of described preset rules is zero, export out code to described motor; Described motor is used for: when receiving the out code that described control module 5 exports, control the liquid flow in tube for transfusion described in described flow-control valve breakdown.
In the present embodiment, if transfusion drip speed described in the volume that when not having liquid to fall in described transfusion drip tube, aerial module is determined is zero, represents the transfusion that is near completion, need timely stopping infusion.Thus control module 5 exports out code to described motor, to make this motor timely control flow check control valve turn off described tube for transfusion, stops the liquid flow in described tube for transfusion.
In an embodiment of the present invention, control module 5 can adopt the realizations such as PLD, single-chip microcomputer, arm processor.
In an embodiment of the present invention, in order to ensure that in transfusion drip speed testing circuit, each circuit is (as demodulation by filter circuit 1, for another example logic conversion circuit 2, especially gain regulating circuit 6) all can obtain burning voltage to ensure the amplitude stability of dropping liquid signal, square-wave signal, transfusion drip speed testing circuit also includes mu balanced circuit, is that in transfusion drip speed testing circuit, each circuit is powered by this mu balanced circuit.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make some equivalent alternative or obvious modification without departing from the inventive concept of the premise; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by submitted to claims.
Claims (10)
1. a transfusion drip speed testing circuit, is characterized in that, the external control module of described transfusion drip speed testing circuit; Described transfusion drip speed testing circuit comprises: the infrared transmitter of array arrangement, the infrared remote receiver of array arrangement, and transfusion drip tube is arranged between described infrared transmitter and described infrared remote receiver;
Described transfusion drip speed testing circuit also comprises demodulation by filter circuit and logic conversion circuit; Described demodulation by filter circuit has infrared input and square wave outfan, and infrared remote receiver described in the infrared input termination of described demodulation by filter circuit, between the square wave outfan that described logic conversion circuit is connected to described demodulation by filter circuit and described control module;
Wherein, described infrared transmitter is used for: send infrared signal with assigned frequency to described infrared remote receiver, to detect the drop fallen in transfusion drip tube;
Wherein, described infrared remote receiver is used for: generating dropping liquid signal when detecting the drop fallen in transfusion drip tube, exporting described dropping liquid signal to described transfusion drip speed testing circuit;
Wherein, described demodulation by filter circuit is used for: receive described dropping liquid signal from described infrared input, carries out matching demodulation and generates square-wave signal, export described square-wave signal from described square wave outfan to the dropping liquid signal received with described assigned frequency;
Wherein, described logic conversion circuit is used for: the square-wave signal square-wave signal that described demodulation by filter circuit exports being adjusted to preset rules, the square-wave signal of described preset rules is exported, to make described control module according to the square-wave signal determination transfusion drip speed of described preset rules to described control module.
2. transfusion drip speed testing circuit as claimed in claim 1, it is characterized in that, described demodulation by filter circuit comprises the block isolating circuit, low-pass filter circuit and the matching demodulation circuit that connect successively;
Described block isolating circuit is used for: filtering is from the DC component the dropping liquid signal that described infrared input receives;
Described low-pass filter circuit is used for: carry out low-pass filtering with the HF noise signal of filtering higher than described assigned frequency to the dropping liquid signal after filtering DC component;
Described matching demodulation circuit is used for: the coupling of the dropping liquid signal after low-pass filtering being carried out to described assigned frequency is screened and generates square-wave signal.
3. transfusion drip speed testing circuit as claimed in claim 2, it is characterized in that, described demodulation by filter circuit also comprises signal amplification circuit, and described signal amplification circuit is connected between described low-pass filter circuit and described matching demodulation circuit;
Described signal amplification circuit is used for: the signal dropping liquid signal after low-pass filtering being carried out to preset multiple amplifies.
4. transfusion drip speed testing circuit as claimed in claim 3, it is characterized in that, described signal amplification circuit is one or more levels amplifying circuit.
5. transfusion drip speed testing circuit as claimed in claim 2, it is characterized in that, described demodulation by filter circuit also comprises buffer circuit, between the matching demodulation circuit that described buffer circuit is connected to described demodulation by filter circuit and described logic conversion circuit;
Described buffer circuit is used for: carry out impedance isolation and/or signal isolation to the square-wave signal that described matching demodulation circuit exports, export the square-wave signal after isolation to described logic conversion circuit.
6. the transfusion drip speed testing circuit as described in as arbitrary in claim 2 to 5, it is characterized in that, described transfusion drip speed testing circuit also comprises gain regulating circuit; Described gain regulating circuit has the first regulation and control end and the second regulation and control end, and described first regulation and control end and described second regulation and control end correspondence connect described matching demodulation circuit and described logic conversion circuit;
Described gain regulating circuit is used for: the amplitude adjusting the square-wave signal that described matching demodulation circuit exports, and adjusts the amplitude of the square-wave signal of the described preset rules that described logic conversion circuit exports.
7. transfusion drip speed testing circuit as claimed in claim 6, it is characterized in that, described matching demodulation circuit comprises: matching demodulation chip, the first electric capacity, the first resistance and described buffer circuit;
The first end of described first electric capacity and the second end correspondence connect the input pin of described low-pass filter circuit and described matching demodulation chip, the first end of described first resistance and the second end correspondence connect the first regulation and control end of described gain regulating circuit and the output pin of described matching demodulation chip, and the output pin of described matching demodulation chip connects described buffer circuit.
8. transfusion drip speed testing circuit as claimed in claim 7, it is characterized in that, described buffer circuit comprises: optical coupling chip, the second resistance and the 3rd resistance;
The high level input of described optical coupling chip, low level input, high level output end and low level output end correspondence connects the second end of described second resistance, the output pin of described matching demodulation chip, described logic conversion circuit and ground, first regulation and control end of gain regulating circuit described in the first termination of described second resistance, the first end of described 3rd resistance and the second end correspondence connect the first regulation and control end of described gain regulating circuit and the high level output end of described optical coupling chip.
9. transfusion drip speed testing circuit as claimed in claim 1, it is characterized in that, described transfusion drip speed testing circuit also comprises motor, and described motor is electrically connected with described control module;
Described control module is used for: determine the described transfusion drip speed in described transfusion drip tube according to the square-wave signal of described preset rules, the speed calculating described transfusion drip speed and described default speed is poor, generate flow adjustment instruction according to described speed difference, export described flow adjustment instruction to described motor;
Described motor is used for: the flow adjustment instruction adjustment flow control valve exported according to described control module, with the fluid flow flow through in tube for transfusion by the adjustment of described flow control valve.
10. transfusion drip speed testing circuit as claimed in claim 9, it is characterized in that, described control module also for: when the described transfusion drip speed in the described transfusion drip tube determined according to the square-wave signal of described preset rules is zero, export out code to described motor;
Described motor is used for: when receiving the out code that described control module exports, control the liquid flow in tube for transfusion described in described flow-control valve breakdown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410226692.1A CN105214170A (en) | 2014-05-27 | 2014-05-27 | A kind of transfusion drip speed testing circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109031453A (en) * | 2018-07-25 | 2018-12-18 | 江苏雅凯医疗科技有限公司 | A kind of infusion apparatus drop measuring device |
| CN109443400A (en) * | 2018-10-18 | 2019-03-08 | 广州智颜科技有限公司 | Squeeze bottle dropping liquid condition checkout gear and its detection method |
| WO2019085278A1 (en) * | 2017-11-03 | 2019-05-09 | 深圳市前海安测信息技术有限公司 | System and method for controlling infusion notification robot on the basis of infrared scanning |
| CN111632227A (en) * | 2020-04-23 | 2020-09-08 | 罗云汉 | Infusion monitoring control system and device |
| CN111870775A (en) * | 2020-07-23 | 2020-11-03 | 深圳圣诺医疗设备股份有限公司 | Infusion detection and identification method and device and infusion equipment |
| CN113952546A (en) * | 2021-11-22 | 2022-01-21 | 江苏爱朋医疗科技股份有限公司 | Method for acquiring infusion dropping speed, method for regulating infusion dropping speed, device, equipment and storage medium |
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| WO2019085278A1 (en) * | 2017-11-03 | 2019-05-09 | 深圳市前海安测信息技术有限公司 | System and method for controlling infusion notification robot on the basis of infrared scanning |
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| CN113952546A (en) * | 2021-11-22 | 2022-01-21 | 江苏爱朋医疗科技股份有限公司 | Method for acquiring infusion dropping speed, method for regulating infusion dropping speed, device, equipment and storage medium |
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