CN101856525B - Medical infusion liquid drop speed monitoring method and device - Google Patents
Medical infusion liquid drop speed monitoring method and device Download PDFInfo
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- CN101856525B CN101856525B CN2010101938707A CN201010193870A CN101856525B CN 101856525 B CN101856525 B CN 101856525B CN 2010101938707 A CN2010101938707 A CN 2010101938707A CN 201010193870 A CN201010193870 A CN 201010193870A CN 101856525 B CN101856525 B CN 101856525B
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Abstract
The invention provides a medical infusion liquid drop speed monitoring method and a medical infusion liquid drop speed monitoring device, which relate to the field of medical infusion monitoring application. The device comprises an infrared double-pair hose detection circuit, a differential detection circuit, a control unit circuit and an alarming circuit, wherein the infrared double-pair hose detection circuit comprises a first infrared transmitter, a first infrared receiver, a first impedance isolator, a second infrared transmitter, a second infrared receiver and a second impedance insulator; the differential detection circuit comprises a signal differentiator, a signal rectifier, a signal amplifier and a voltage stabilizing and signal shaper; and the control unit circuit is used for processing the failing edge of an output pulse signal of the differential detection circuit and acquiring the time interval between two adjacent infusion liquid drops to judge if an alarming signal is needed to be generated. In the invention, the anti-interference performance of both the medical infusion liquid drop speed monitoring method and the medical infusion liquid drop speed monitoring device is improved.
Description
Technical field
The present invention relates to a kind of medical infusion liquid drop speed monitoring method and device thereof, belong to medical infusion monitoring application.
Background technology
At present, the monitoring device that is used for medical infusion generally adopts infrared mutual-tube, and promptly infrared light-emitting diode and infrared ray receive the both sides that phototriode is installed on the Murphy type burette wall respectively symmetrically, whether the drop in the Murphy type burette is dripped detect.The operation principle of this drop detection is: adopt infrared detection technology at Murphy type burette wall place transfusion speed to be detected; Be specially infrared light-emitting diode and send infrared light; Light sees through Murphy type burette and shines infrared reception phototriode, and infrared reception phototriode converts the optical signal that receives to photoelectric current output.When not having drop to pass through in the Murphy type burette, light attenuation is little, the more intense photoelectric current of infrared reception phototriode output; When having drop to pass through in the Murphy type burette, because drop absorbs and scattering process light, the optical signal that shines infrared reception phototriode is more weak, causes the more weak photoelectric current of infrared reception phototriode output; Then change in current is converted into the variation of voltage,, just can detect dripless and pass through through detecting the variation of infrared reception phototriode output end voltage.In addition, because the drop two ends are bigger than the middle refraction to infrared light of drop, cause infrared reception phototriode open circuit; Output voltage uprises; So all can receive twice pulse signal during each drop drippage, this pulse signal is sent into microprocessor through signal conditioning circuit, microprocessor then can be according to detected number of pulse signals in the unit interval; Calculate the speed of infusion liquid drop, when liquid drop speed is too slowly or too fast, all send alarm sound.
The shortcoming of this medical infusion monitoring device based on infrared mutual-tube is: 1. when seeing through stray light in the Murphy type burette; The output voltage of infrared reception phototriode is not 0V when having drop to drip, and the amplitude of voltage pulse output is directly proportional with disturbing light intensity; 2. when the Murphy type burette inwall has water smoke, can block a part of infrared light, the output voltage of infrared reception phototriode also is not 0V when drop drips.The dipulse signal that above-mentioned situation all probably causes infrared reception phototriode to be sent seriously distorts; Detected number of pulse signals is inaccurate in unit interval; It is inaccurate finally to cause the fuction monitoring device for infusion liquid drop speed to detect; But do not report when reporting perhaps this warning in the time of should not reporting to the police by mistake, lead to serious malpractice.
Therefore, how improving the anti-interference based on the medical infusion monitoring device of infrared detection technology, is the key technology that medical infusion monitoring application must solve.
Summary of the invention
The objective of the invention is to deficiency to above-mentioned prior art; A kind of strong medical infusion liquid drop speed monitoring method and device thereof of capacity of resisting disturbance based on infrared ray biconjugate pipe Differential Detection proposed; When liquid drop speed in the Murphy type burette is too slowly or too fast; All report to the police automatically, send the sound clearly, prompting patient or nurse in time handle.
A kind of medical infusion liquid drop speed monitoring method is characterized in that:
1) the first infrared signal collection and the second infrared signal collection are set; Collect first infrared signal and second infrared signal respectively; And first infrared signal and second infrared signal delivered to signal differential and conditioning; Through obtaining pulse signal INT1_1 after signal differential and the conditioning, at last pulse signal INT1_1 is inputed to the interruptive port INT1 of the microprocessor chip of control unit circuit;
2) the outfan s_1 of initialization microprocessor chip output high level; Be that warning circuit does not send alarm signal; When the interruptive port INT1 of microprocessor chip detects the trailing edge of pulse signal INT1_1 signal for the first time; The counter O reset of microprocessor chip, and restart timing, establishing between this enumerator institute timing is t
0
3) compare t
0And the size between the t1, t1 is the time that drop passes through distance between first infrared emission and second infrared emission, t1=0.09～0.11s;
4) if t
0＜t1 then forwards step (3) to;
5) if t
0>=t1 waits for that then the interruptive port INT1 of microprocessor chip detects the trailing edge of pulse signal INT1_1 once more;
6) if the interruptive port INT1 of microprocessor chip detects the trailing edge of pulse signal INT1_1 once more, then with t between the enumerator institute timing of microprocessor chip
0Assignment is given variable temp, i.e. temp=t
0, temp then is the interval between adjacent two drops, liquid drop speed v then for 60/temp drip/minute; And counter O reset with microprocessor chip; Restart timing, if temp≤0.15s, i.e. liquid drop speed v>=400 droplet/minute; The outfan s_1 output low level of microprocessor chip then, the buzzer of warning circuit sends alarm sound; If temp＞0.15s, promptly liquid drop speed v＜400 droplet/minute then forward step (3) to;
7) if the interruptive port INT1 of microprocessor chip does not detect trailing edge and the t of pulse signal INT1_1 once more
0＜6s, promptly liquid drop speed v＞10 droplet/minute then forward step (5) to;
8) if the interruptive port INT1 of microprocessor chip does not detect trailing edge and the t of pulse signal INT1_1 once more
0>=6s, i.e. liquid drop speed v≤10 droplet/minute, the outfan s_1 output low level of microprocessor chip, the buzzer of warning circuit sends alarm sound.
A kind of monitoring device that adopts above-mentioned medical infusion liquid drop speed monitoring method; It is characterized in that; Comprise: infrared ray biconjugate pipe testing circuit, differential detection circuit, control unit circuit and warning circuit, the first infrared ray output terminals A of infrared ray biconjugate pipe testing circuit
1_1The first infrared ray input A with differential detection circuit
1_2Link to each other the second infrared ray output terminals A of infrared ray biconjugate pipe testing circuit
2_1The second infrared ray input A with differential detection circuit
2_2Link to each other, the outfan INT11 of differential detection circuit links to each other with the input INT1 of control unit circuit, and the outfan s_1 of control unit circuit links to each other with the input s_2 of warning circuit,
Said infrared ray biconjugate pipe testing circuit is used to export first infrared signal and second infrared signal through after the impedance isolation; It comprises: first infrared emission, the first infrared reception, first impedance isolation, second infrared emission, the second infrared reception and second impedance are isolated; The isolated input of said first impedance is connected with the first infrared reception, and its output terminals A
1_1As the outfan of infrared ray biconjugate pipe testing circuit and the input A of said differential detection circuit
1_2Connect, the isolated input of said second impedance is connected with the second infrared reception, and its output terminals A
2_1As the outfan of infrared ray biconjugate pipe testing circuit and the input A of said differential detection circuit
2_2Connect;
Said first infrared emission comprises resistance R 2 and infraluminescence diode D7; The first infrared reception comprises resistance R 18 and phototriode T1; Second infrared emission comprises resistance R 17 and infraluminescence diode D8, and the second infrared reception comprises resistance R 3 and phototriode T2
Said infraluminescence diode D7 and phototriode T1 symmetry respectively are positioned at Murphy type burette wall both sides; Said infraluminescence diode D8 and phototriode T2 symmetry respectively are positioned at Murphy type burette wall both sides; And infraluminescence diode D7 is apart from Murphy type burette top 20mm; Apart from infraluminescence diode D818mm
The colelctor electrode of said phototriode T1 links to each other with the isolated pin 3 of first impedance; The colelctor electrode of said phototriode T2 links to each other with the isolated pin 3 of second impedance; First impedance is isolated and second impedance isolation is emitter follower; Be used to improve signal output impedance, play the isolated effect of impedance;
Said differential detection circuit is used for first infrared signal that receives and second infrared signal are carried out difference, and output is suitable for the pulse signal INT1_1 that above-mentioned control unit circuit is handled after carrying out signal condition,
Said differential detection circuit is formed by connecting signal differential, signal rectification, signal amplification and voltage stabilizing and signal shaping four parts successively, and each junction point is followed successively by B1, C1, D1,
The input A of said signal differential
1_2Output terminals A as the input and the infrared ray biconjugate pipe testing circuit of differential detection circuit
1_1Connect the input A of signal differential
2_2Output terminals A as the input and the infrared ray biconjugate pipe testing circuit of differential detection circuit
2_1Connect, the outfan INT11 of said signal shaping is connected with the input INT1 of said control unit circuit as the outfan of differential detection circuit.
Compared with prior art, medical infusion liquid drop speed monitoring method of the present invention and device thereof have the strong beneficial effect of capacity of resisting disturbance, and be specific as follows:
1) because medical infusion liquid drop speed monitoring device of the present invention has proposed a kind of differential detection circuit based on infrared ray biconjugate pipe Differential Detection; First infrared signal that receives and second infrared signal are carried out output behind the signal condition through signal differential, signal rectification, signal amplification and voltage stabilizing and signal shaping four partial circuits successively, and to be suitable for the low level that control unit circuit handles be 0V; High level is the pulse signal INT1_1 of 5V; Therefore, effectively improved the interference free performance of medical infusion liquid drop speed monitoring device to stray light etc.;
2) because the time t1=0.09～0.11s of drop through distance between first infrared emission and second infrared emission is set, work as t
0During＜t1, microprocessor chip continues relatively timer t
0And the size between the t1; And the present invention is with first trailing edge of the pulse signal INT1_1 of each drop picking up counting the time of drop for this reason; Thereby obtain the interval between each adjacent two infusion liquid drop; Finally judging whether needs to produce alarm signal, therefore, has effectively avoided the influence of various interference pulse signals INT1_1 in time period t 1; Compare the method for generally calculating liquid drop speed, greatly improved the anti-interference of medical infusion liquid drop speed monitoring method through the pulse number of unit of account detected pulse signal INT1_1 in the time.
Description of drawings
Fig. 1 is the theory diagram of medical infusion liquid drop speed monitoring device of the present invention
Fig. 2 is an infrared ray biconjugate pipe scheme of installation
Fig. 3 is an infrared ray biconjugate pipe testing circuit schematic diagram
Fig. 4 is the differential detection circuit schematic diagram
Fig. 5 is each key signal oscillogram in the differential detection circuit
Fig. 6 is control unit circuit and warning circuit schematic diagram
Fig. 7 is a medical infusion liquid drop speed monitoring method flow chart of the present invention
In above each figure, adopted unified label, promptly same signal or object are used same label in each figure.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description, but following embodiment should not be construed as limitation of the present invention.
The content of this embodiment comprises two parts, first medical infusion liquid drop speed monitoring device, and it two is medical infusion liquid drop speed monitoring methods.
(1) medical infusion liquid drop speed monitoring device
As shown in Figure 1; This medical infusion liquid drop speed monitoring device comprises: infrared ray biconjugate pipe testing circuit 1, differential detection circuit 2, control unit circuit 3 and warning circuit 4; Its middle infrared (Mid-IR) biconjugate pipe testing circuit 1 comprises: the infrared reception of first infrared emission 11, first 12, first impedance are isolated u19,13, the second infrared reception 14 of second infrared emission and second impedance and are isolated u17; The input that u19 is isolated in said first impedance is connected with the first infrared reception 12, and its output terminals A
1_1As the outfan of infrared ray biconjugate pipe testing circuit 1 and the input A of said differential detection circuit 2
1_2Connect, the input that u17 is isolated in said second impedance is connected with the second infrared reception 14, and its output terminals A
2_1As the outfan of infrared ray biconjugate pipe testing circuit 1 and the input A of said differential detection circuit 2
2_2Connect; Said differential detection circuit 2 is used for first infrared signal that receives and second infrared signal are carried out difference; And output is suitable for the pulse signal INT1_1 that said control unit circuit 3 is handled after carrying out signal condition; This differential detection circuit 2 is connected in sequence by signal differential 211, signal rectification 221, signal amplification and voltage stabilizing 231 and signal shaping 241 4 parts, and the input A of signal differential 211
1_2Output terminals A as the input and the infrared ray biconjugate pipe testing circuit 1 of differential detection circuit 2
1_1Connect the input A of signal differential 211
2_2Output terminals A as the input and the infrared ray biconjugate pipe testing circuit 1 of differential detection circuit 2
2_1Connect, the outfan INT11 of said signal shaping 241 is connected with the input INT1 of said control unit circuit 3 as the outfan of differential detection circuit 2; Said control unit circuit 3 is used for obtaining the interval between adjacent two drops after pulse signal INT1_1 to the outfan INT11 of differential detection circuit 2 handles; Thereby judge whether to need to produce alarm signal; Its input INT1 is connected with the outfan INT11 of said differential detection circuit 2, and outfan (s_1) is connected with the input (s_2) of said warning circuit 4; The input of said warning circuit 4 (s_2) is connected with the outfan (s_1) of said control unit circuit 3, and the alarm command that is used to receive control unit circuit 3 sends alarm sound.
As shown in Figure 3; Infrared ray biconjugate pipe testing circuit schematic diagram comprises: the infrared reception of first infrared emission 11, first 12, first impedance are isolated u19,13, the second infrared reception 14 of second infrared emission and second impedance and are isolated u17; Wherein first infrared emission 11 comprises resistance R 2 and infraluminescence diode D7; The first infrared reception 12 comprises resistance R 18 and phototriode T1; Second infrared emission 13 comprises resistance R 17 and infraluminescence diode D8, and the second infrared reception 14 comprises resistance R 3 and phototriode T2, and is as shown in Figure 2; Said infraluminescence diode D7 and phototriode T1 symmetry respectively are positioned at Murphy type burette wall both sides; Said infraluminescence diode D8 and phototriode T2 symmetry respectively are positioned at Murphy type burette wall both sides, and infraluminescence diode D7 is apart from Murphy type burette top 20mm, apart from infraluminescence diode D818mm; The colelctor electrode of said phototriode T1 links to each other with the pin 3 that u19 is isolated in first impedance; The colelctor electrode of said phototriode T2 links to each other with the pin 3 that u17 is isolated in second impedance; U19 is isolated in first impedance and second impedance isolation u17 is emitter follower; Be used to improve signal output impedance, play the isolated effect of impedance.The operation principle of infrared ray biconjugate pipe testing circuit is: as shown in Figure 2; Infrarede emitting diode D7 and D8 all send infrared light; Light sees through Murphy type burette and shines phototriode T1 and T2 respectively, and phototriode T1 and T2 all convert the optical signal that receives to current signal output.When not having drop to pass through in the Murphy type burette, light attenuation is little, the current signal that phototriode output is more intense; When having drop to pass through in the Murphy type burette, because drop absorbs and scattering process light, the optical signal that phototriode receives is more weak, then the more weak current signal of output.
As shown in Figure 4; Differential detection circuit 2 is used for first infrared signal that receives and second infrared signal are carried out difference; And output is suitable for the pulse signal INT1_1 that control unit circuit 3 is handled after carrying out signal condition, and this differential detection circuit 2 is formed by connecting signal differential 211, signal rectification 221, signal amplification and voltage stabilizing 231 and signal shaping 241 4 parts successively, and each junction point is followed successively by B1, C1, D1; As shown in Figure 5; Because the infusion liquid drop two ends are bigger to the refraction of infrared light than drop mid portion, cause the phototriode tube open circuit, output voltage uprises; So each drop during through Murphy type burette phototriode T1 and T2 all can receive twice pulse signal, so first infrared signal that differential detection circuit receives and second infrared signal are respectively like A among Fig. 5
1And A
2Shown in waveform, A
1And A
2The low level of waveform part is not 0V all, is respectively 1V and 0.8V, is that the influence owing to stray light causes infrared signal A
1And A
2Low level partly be elevated two-way infrared signal A
1And A
2The signal waveform of process signal differential 211 back outfan B1 is shown in B among Fig. 5, and the signal waveform of passing through signal rectification 221 back outfan C1 again is shown in C among Fig. 5, and the low level of signal C has been lower than 0.38V obviously than signal A
1And A
2The low level part much lower, visible because the effect of difference has greatly been eliminated stray light to signal A
1Or A
2The lifting effect of low level part, but because difference causes the high level of signal C partly than signal A
1Or A
2Reduce to some extent, and the amount that is reduced is the A that stray light causes
1Or A
2Low level part from the voltage of 0V lifting; Therefore; Be to eliminate the weakening effect of stray light to signal C high level part, special signal C is amplified with voltage stabilizing 231 through signal amplified 4 times and after 4.7V Zener diode D100 voltage stabilizing, obtain the output signal D of signal amplification and voltage stabilizing 231, shown in D among Fig. 5; The high level of signal D partly surpasses 3.495V, than signal A
1Or A
2All much bigger, then stray light not only by full remuneration, and has effectively strengthened its high level part to the weakening effect of signal C high level part; Signal D is through signal shaping 241; Promptly behind 555 timer circuits, obtaining low level as shown in Figure 5 is 0V, and high level is the digit pulse waveform E of 5V; Be the pulse signal INT1_1 of differential detection circuit 2 outputs, the first infrared signal A of the visible strong influence of light intensity that is interfered
1With the second infrared signal A
2, eliminated fully through these differential detection circuit 2 back stray lights.
As shown in Figure 6; Control unit circuit 3 is made up of microprocessor chip 33, crystal oscillating circuit 32 and watchdog reset circuit 31 3 parts; Be used for obtaining the interval between adjacent two drops after pulse signal INT1_1 to differential detection circuit 2 output handles; Thereby judging whether needs to produce alarm signal, and its outfan s_1 is connected with the input s_2 of said warning circuit 4, and present embodiment adopts microprocessor chip ATmegal16; The alarm command that said warning circuit 4 is used to receive control unit circuit 3 sends alarm sound, is formed by connecting U5A, U4 and buzzer LS2 three parts successively, and wherein U5A adopts phase inverter chip 74LS04, and U4 adopts chip for driving ULN2003.
(2) medical infusion liquid drop speed monitoring method
The practical implementation step of present embodiment monitoring method is:
1) first infrared signal is set and gathers 51 and second infrared signal collection 52; Collect first infrared signal and second infrared signal respectively; And first infrared signal and second infrared signal delivered to signal differential and nurse one's health 53; Obtain pulse signal INT1_1 through signal differential and after nursing one's health 53, at last pulse signal INT1_1 is inputed to the interruptive port INT1 of the microprocessor chip 33 of control unit circuit 3;
2) the outfan s_1 of initialization microprocessor chip 33 output high level; Be that warning circuit 4 does not send alarm signal; When the interruptive port INT1 of microprocessor chip 33 detects the trailing edge of pulse signal INT1_1 signal for the first time; The counter O reset of microprocessor chip 33, and restart timing, establishing between this enumerator institute timing is t
0
3) compare t
0And the size between the t1, t1 is the time that drop passes through distance between first infrared emission 11 and second infrared emission 13, t1=0.1s in the present embodiment;
4) if t
0＜t1 then forwards step (3) to;
5) if t
0>=t1 waits for that then the interruptive port INT1 of microprocessor chip 33 detects the trailing edge of pulse signal INT1_1 once more;
6) if the interruptive port INT1 of microprocessor chip 33 detects the trailing edge of pulse signal INT1_1 once more, then with t between the enumerator institute timing of microprocessor chip 33
0Assignment is given variable temp, i.e. temp=t
0, temp then is the interval between adjacent two drops, liquid drop speed v then for 60/temp drip/minute; And counter O reset with microprocessor chip 33; Restart timing, if temp≤0.15s, i.e. liquid drop speed v>=400 droplet/minute; The outfan s_1 output low level of microprocessor chip 33 then, the buzzer LS2 of warning circuit 4 sends alarm sound; If temp＞0.15s, promptly liquid drop speed v＜400 droplet/minute then forward step (3) to;
7) if the interruptive port INT1 of microprocessor chip 33 does not detect trailing edge and the t0＜6s of pulse signal INT1_1 once more, promptly liquid drop speed v＞10 droplet/minute then forward step (5) to;
8) if the interruptive port INT1 of microprocessor chip 33 does not detect trailing edge and the t of pulse signal INT1_1 once more
0>=6s, i.e. liquid drop speed v≤10 droplet/minute, the outfan s_1 output low level of microprocessor chip 33, the buzzer LS2 of warning circuit 4 sends alarm sound.
Claims (4)
1. medical infusion liquid drop speed monitoring method is characterized in that:
1) the first infrared signal collection (51) and the second infrared signal collection (52) are set; Collect first infrared signal and second infrared signal respectively; And first infrared signal and second infrared signal delivered to signal differential and conditioning (53); Through obtaining pulse signal INT1_1 after signal differential and the conditioning (53), at last pulse signal INT1_1 is inputed to the interruptive port INT1 of the microprocessor chip (33) of control unit circuit (3);
2) outfan (s_1) of initialization microprocessor chip (33) output high level; Be that warning circuit (4) does not send alarm signal; When the interruptive port INT1 of microprocessor chip (33) detects the trailing edge of pulse signal INT1_1 signal for the first time; The counter O reset of microprocessor chip (33), and restart timing, establishing between this enumerator institute timing is t
0
3) compare t
0And the size between the t1, t1 is the time that drop passes through distance between first infrared emission (11) and second infrared emission (13), t1=0.09～0.11s;
4) if t
0＜t1 then forwards step (3) to;
5) if t
0>=t1 waits for that then the interruptive port INT1 of microprocessor chip (33) detects the trailing edge of pulse signal INT1_1 once more;
6) if the interruptive port INT1 of microprocessor chip (33) detects the trailing edge of pulse signal INT1_1 once more, then with t between the enumerator institute timing of microprocessor chip (33)
0Assignment is given variable temp, i.e. temp=t
0, temp then is the interval between adjacent two drops, liquid drop speed v then for 60/temp drip/minute; And counter O reset with microprocessor chip (33); Restart timing, if temp≤0.15s, i.e. liquid drop speed v>=400 droplet/minute; The outfan of microprocessor chip 33 (s_1) output low level then, the buzzer (LS2) of warning circuit (4) sends alarm sound; If temp＞0.15s, promptly liquid drop speed v＜400 droplet/minute then forward step (3) to;
7) if the interruptive port INT1 of microprocessor chip (33) does not detect trailing edge and the t of pulse signal INT1_1 once more
0＜6s, promptly liquid drop speed v＞10 droplet/minute then forward step (5) to;
8) if the interruptive port INT1 of microprocessor chip (33) does not detect trailing edge and the t of pulse signal INT1_1 once more
0>=6s, i.e. liquid drop speed v≤10 droplet/minute, outfan (s_1) output low level of microprocessor chip (33), the buzzer (LS2) of warning circuit (4) sends alarm sound.
2. device of realizing the described medical infusion liquid drop speed monitoring method of claim 1; It is characterized in that; Comprise: infrared ray biconjugate pipe testing circuit (1), differential detection circuit (2), control unit circuit (3) and warning circuit (4), the first infrared ray output terminals A of infrared ray biconjugate pipe testing circuit (1)
1_1The first infrared ray input A with differential detection circuit (2)
1_2Link to each other the second infrared ray output terminals A of infrared ray biconjugate pipe testing circuit (1)
2_1The second infrared ray input A with differential detection circuit (2)
2_2Link to each other, the outfan INT11 of differential detection circuit (2) links to each other with the interruptive port INT1 of the microprocessor chip (33) of control unit circuit (3), and the outfan (s_1) of control unit circuit (3) links to each other with the input (s_2) of warning circuit (4),
Said control unit circuit (3) obtains the interval between adjacent two drops after being used for the output end signal of differential detection circuit (2) handled; Thereby judge whether to need to produce alarm signal; Its input INT1 is connected with the outfan INT11 of said differential detection circuit (2), and outfan (s_1) is connected with the input (s_2) of said warning circuit (4);
The input (s_2) of said warning circuit (4) is connected with the outfan (s_1) of said control unit circuit (3), and the alarm command that is used to receive control unit circuit (3) sends alarm sound.
3. device according to claim 2; It is characterized in that; Said infrared ray biconjugate pipe testing circuit (1) is used to export first infrared signal and second infrared signal through after the impedance isolation; It comprises: first infrared emission (11), the first infrared reception (12), first impedance are isolated (u19), second infrared emission (13), the second infrared reception (14) and second impedance and are isolated (u17); The input that (u19) isolated in said first impedance is connected with the first infrared reception (12), and its output terminals A
1_1As the outfan of infrared ray biconjugate pipe testing circuit (1) and the input A of said differential detection circuit (2)
1_2Connect, the input that (u17) isolated in said second impedance is connected with the second infrared reception (14), and its output terminals A
2_1As the outfan of infrared ray biconjugate pipe testing circuit (1) and the input A of said differential detection circuit (2)
2_2Connect;
Said first infrared emission (11) comprises resistance (R2) and infraluminescence diode (D7); The first infrared reception (12) comprises resistance (R18) and phototriode (T1); Second infrared emission (13) comprises resistance (R17) and infraluminescence diode (D8); The second infrared reception (14) comprises resistance (R3) and phototriode (T2)
Said first infrared emission; (11) infraluminescence diode; (D7) and the said first infrared reception; (12) phototriode; (T1) symmetry is positioned at Murphy type burette wall both sides respectively; Said second infrared emission; (13) infraluminescence diode; (D8) and the said second infrared reception; (14) phototriode; (T2) symmetry is positioned at Murphy type burette wall both sides respectively; And said first infrared emission; (11) infraluminescence diode; (D7) apart from Murphy type burette top 20mm; Said second infrared emission of distance; (13) infraluminescence diode; (D8) 18mm
The colelctor electrode of said phototriode (T1) links to each other with the pin 3 that (u19) isolated in first impedance; The colelctor electrode of said phototriode (T2) links to each other with the pin 3 that (u17) isolated in second impedance; (u19) isolated in first impedance and second impedance isolation (u17) is emitter follower; Be used to improve signal output impedance, play the isolated effect of impedance.
4. device according to claim 2; It is characterized in that; Said differential detection circuit (2) is used for first infrared signal that receives and second infrared signal are carried out difference, and output is suitable for the pulse signal INT1_1 that above-mentioned control unit circuit (3) is handled after carrying out signal condition
Said differential detection circuit (2) is formed by connecting signal differential (211), signal rectification (221), signal amplification and voltage stabilizing (231) and signal shaping (241) four parts successively, and each junction point is followed successively by B1, C1, D1,
The input A of said signal differential (211)
1_2Output terminals A as the input and the infrared ray biconjugate pipe testing circuit (1) of differential detection circuit (2)
1_1Connect the input A of signal differential (211)
2_2Output terminals A as the input and the infrared ray biconjugate pipe testing circuit (1) of differential detection circuit (2)
2_1Connect, the outfan INT11 of said signal shaping (241) is connected with the input INT1 of said control unit circuit (3) as the outfan of differential detection circuit (2).
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|---|---|---|---|
| CN2010101938707A CN101856525B (en) | 2010-06-07 | 2010-06-07 | Medical infusion liquid drop speed monitoring method and device |
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| EP4092391A4 (en) * | 2021-03-15 | 2024-03-06 | P&M Co., Ltd. | Detecting device |
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