CN2766857Y

CN2766857Y - Vibration sensing type transfusion alarming device

Info

Publication number: CN2766857Y
Application number: CN 200420066155
Authority: CN
Inventors: 李元章; 白春生
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-22
Filing date: 2004-06-22
Publication date: 2006-03-29
Anticipated expiration: 2014-06-22

Abstract

The utility model relates to a vibration sensing transfusion alarm, the aim of which is to provide a transfusion alarm which can not affect the physicochemical properties of physic liquor for intravenous injection in the use process. The utility model comprises a vibration sensor, vibration signal amplifying circuit, a switching circuit and an audio alarm circuit, wherein the time constant of the switching circuit is jointly determined by an adjustable resistor VR and a capacitor C; the vibration signal amplifying circuit is formed by the combination of two RC coupling amplifiers; a piezoelectric sensor is preferred to be chosen as the vibration sensor. Therefore, the utility model can automatically give alarms when physical liquor is dropped up and transfusion is interrupted. The utility model has the advantages of small size, compact structure, light weight, convenient use, reliable performance, low power consumption, high anti-interference capability, no contact with physic liquor, no radiation, no light ray which penetrates through physic liquor and no influence on ingredients and properties of physic liquor.

Description

The vibration sensing type infusion alarm

Technical field

This utility model relates to medical alarm device, particularly relates to a kind of vibration sensing type infusion alarm.

Background technology

In order to alleviate the burden of medical personnel in the infusion process, once there was Crinis Carbonisatus to understand electrode sensing formula and photoelectric sensing type infusion alarm, but because the former needs electric current by the intravenous injection medicinal liquid, the latter needs light by the intravenous injection medicinal liquid, the both can be to some extent constitutes influence to the physicochemical property of intravenous injection medicinal liquid, therefore, all do not applied.

Summary of the invention

The purpose of this utility model is to overcome the above-mentioned defective of prior art, and the vibration sensing type infusion alarm of the physicochemical property that can not influence the intravenous injection medicinal liquid in a kind of use is provided.

For achieving the above object, this utility model vibration sensing type infusion alarm comprises the vibrating sensor that links to each other successively, the vibration signal amplifying circuit, and time constant is by the on-off circuit of adjustable resistance VR and capacitor C 5 common decisions, audio alarm circuit.Vibrating sensor is in order to receive the vibration wave that produces when droplets fall or bubble rise.When the vibrating sensor of alarm is fixed on the pipkin of transfusion device, in infusion process, medicinal liquid flows in the pipkin of transfusion device through the pipeline of transfusion device, in droplets fall during to the liquid level of pipkin, because action of gravity, produce a vibration wave, this vibration wave reaches the wall of pipkin, the vibrating sensor of being close on the pipkin wall receives, and be converted to the signal of telecommunication, send into on-off circuit after this signal of telecommunication is exaggerated, the output signal of on-off circuit is sent into the audio alarm circuit that is made of LF multivibrator again.When vibrating sensor was fixed on the infusion bottle, the vibration that bubble produced when the received vibration signal of its vibrating sensor is the air inlet pipe air inlet, its vibration were to pass to bottle by the liquid in the infusion bottle.When the liquid level of liquid in the infusion bottle was lower than the aperture position of air inlet pipe syringe needle, because air directly enters a bottle interior space, no bubble produced, thereby did not have vibration signal output, alarm equipment alarm.When a variety of causes causes tube for transfusion to block, because of causing not having bubble, no air admission infusion bottle produces, therefore also produce with regard to vibrating, make alarm equipment alarm.

As optimization, the time constant of on-off circuit is determined jointly by adjustable resistance VR and capacitor C 5.So design has dependable performance and the convenient advantage of setting.

As optimization, on-off circuit is made up of VR, C5, T4, T5, T6, and wherein the drain electrode of T4 links to each other with the base stage of T5, the drain electrode of T5 links to each other with the base stage of T6, and VR and C5 are connected the base stage of T6 jointly.

As optimization, on-off circuit also comprises T6 conducting holding circuit, T6 conducting holding circuit comprises D1, D2, C4 and T3, wherein the N of D1, D2 connects the audio alarm circuit extremely jointly, the P utmost point of D1 connects power cathode by C4, the P utmost point of D1 also connects the base stage of T3, and the source electrode of T3 connects power cathode, and the drain electrode of T3 connects the base stage of T4.

As optimization, the audio alarm circuit comprises multivibrator.

As optimization, multivibrator preferably is made up of T7, T8, C6, C7, C8, R15, R16, R17 and buzzer BZ2, wherein the source electrode of T7 connects positive source, base stage connects power cathode by source electrode, the drain electrode that R17 connects T6 by R15, the source electrode of T8 connects positive source, base stage connects power cathode by source electrode, the drain electrode that R16 connects T6 by buzzer BZ2, and the drain electrode of T7 connects base stage, the T7 of T8 by C6 base stage connects the drain electrode of T8 by C7, and C8 connects drain electrode and the power cathode of T8.

As optimization, the audio alarm circuit also comprises filter capacitor C9.

As optimization, the vibration signal amplifying circuit is combined by two RC coupling amplifiers.

As optimization, the preferred piezoelectric transducer of vibrating sensor.Preferred piezoquartz of its vibrating sensor or piezoelectric ceramics.

As optimization, on and off switch K is the discharge switch of double as capacitor C 5 also, the preferred DC3V of power supply.When on and off switch K disconnected, its movable contact 2 was connected with stationary contact 1, can thoroughly be capacitor C 5 discharges, guaranteed that next time spent of this static alarm can work reliably; When on and off switch K closed, movable contact 2 was connected with contact 3.

Its operation principle is: when transfusion is normally carried out, the blanking time of twice vibration wave that pipkin produces is consistent with the interval that the drop of transfusion falls, the time constant of on-off circuit is determined jointly by adjustable resistance VR and capacitor C 5, when twice time of vibration shorter at interval, when the anodal voltage of C5 does not also rise to the required voltage of T6 conducting, the positive half cycle of the vibration signal after being exaggerated of signal amplification circuit T4 output is sent into the base stage of T5, make the T5 saturation conduction, voltage on the C5 positive pole is bled off by T5, the T6 base stage can not get bias voltage and ends, LF multivibrator is not worked, and buzzer is not reported to the police.

When the speed of transfusion is lower than the flow of setting, the vibration signal of telecommunication of signal amplification circuit output is extended blanking time, voltage on the C5 positive pole rises rapidly, the voltage of T6 base stage also rises, when the voltage on the C5 positive pole rises to when being enough to make the T6 conducting, the T6 conducting, the audio oscillator that T7, T8 form is started working, and buzzer sends alternate sound and reports to the police.Thereby notify the nursing staff to come to handle.

When transfusion finishes, the output of vibration signal amplifying circuit no signal, T5 ends, voltage on the C5 positive pole rises rapidly, and the T6 base voltage also rises, when the voltage on the C5 positive pole rises to when being enough to make the T6 conducting, the T6 conducting, the LF multivibrator that T7, T8 form is started working, and buzzer sends alternate chimes of doom, notifies medical personnel to come to handle.

When warning circuit is worked, the T8 collector voltage is cyclically-varying, when buzzer is sounded, the T8 saturation conduction, its collector voltage is near zero volt, this moment diode D1, D2 is in the forward bias state, the cathode voltage of C4 and the base voltage of T5 are D1, the saturation voltage drop sum of the forward drop of D2 and T8 colelctor electrode, the transistor T 3 approaching saturated T4 that cause are also near saturation conduction, T5 is reliably ended, and T6 maintains conducting state, thereby guarantees the alarm circuit operate as normal, the effect of diode D2 is to make T5 maintain cut-off state more reliably, to guarantee the steady operation of warning circuit.

After adopting technique scheme, this utility model vibration sensing type infusion alarm can and be infused when medicine liquid droplet is most and be reported to the police automatically when interrupting, have that volume is little, compact conformation, in light weight, easy to use, dependable performance, low in energy consumption, capacity of resisting disturbance is strong, does not contact, radiationless, dull thread passes medicinal liquid the advantage that the composition and the character of medicinal liquid are not had influence with medicinal liquid.

Description of drawings

Fig. 1 is the circuit theory diagrams of this utility model vibration sensing type infusion alarm.

The specific embodiment

Do further explanation below in conjunction with accompanying drawing and instantiation:

As shown in the figure, this utility model vibration sensing type infusion alarm involving vibrations pick off, vibration signal amplifying circuit, on-off circuit, audio alarm circuit and DC3V power supply.The time constant of on-off circuit is determined jointly by adjustable resistance VR and capacitor C 5.On-off circuit is made up of delay circuit and T6 conducting holding circuit, and delay circuit is made up of VR, C5, T4, T5, T6, and T6 conducting holding circuit is made up of D1, D2, C4 and T3.The audio alarm circuit is made up of LF multivibrator and filter capacitor C9.LF multivibrator is made up of T7, T8, C6, C7, C8, R15, R16, R17 and buzzer BZ2.The vibration signal amplifying circuit is combined by two RC coupling amplifiers, specifically is made up of T1, T2, C1, C2, R1, R2, R3, R4, R5, R6 and R7.Vibrating sensor is piezoelectric transducer BZ1.On and off switch K is the discharge switch of double as capacitor C 5 also.The parameter of each electronic original part is R17, the R18 of 220K Ω of R16,100K Ω of R15,100K Ω of VR, 10K Ω of R13,3M Ω of R11,51K Ω of R9,2K Ω of R8,47K Ω of R7,1K Ω of R6,470K Ω of R5,20 Ω of R4,10K Ω of R3,1.8M Ω of R2,10 Ω of R1, the 12K Ω of 1.8M Ω; The C9 of the C8 of the C7 of the C6 of the C5 of the C4 of the C3 of the C2 of the C1 of 1 μ F, 4.7 μ F, 22 μ F, 47 μ F, 22 μ F, 10 μ F, 4.7 μ F, 47 μ F, 100 μ F; D1, D2 are 1N4148.

Claims

1, a kind of vibration sensing type infusion alarm is characterized in that comprising the vibrating sensor that links to each other successively, the vibration signal amplifying circuit, and time constant is by the on-off circuit of adjustable resistance VR and capacitor C 5 common decisions, audio alarm circuit.

2, vibration sensing type infusion alarm according to claim 1, it is characterized in that on-off circuit is made up of VR, C5, T4, T5, T6, wherein the drain electrode of T4 links to each other with the base stage of T5, the drain electrode of T5 links to each other with the base stage of T6, and VR and C5 are connected the base stage of T6 jointly.

3, vibration sensing type infusion alarm according to claim 2, it is characterized in that on-off circuit also comprises T6 conducting holding circuit, T6 conducting holding circuit comprises D1, D2, C4 and T3, wherein the N of D1, D2 connects the audio alarm circuit extremely jointly, the P utmost point of D1 connects power cathode by C4, the P utmost point of D1 also connects the base stage of T3, and the source electrode of T3 connects power cathode, and the drain electrode of T3 connects the base stage of T4.

4, vibration sensing type infusion alarm according to claim 1 is characterized in that the audio alarm circuit comprises multivibrator.

5, vibration sensing type infusion alarm according to claim 4, it is characterized in that multivibrator is preferably by T7, T8, C6, C7, C8, R15, R16, R17 and buzzer BZ2 form, wherein the source electrode of T7 connects positive source, base stage connects the source electrode of T6 by R17, drain electrode connects power cathode by R15, the source electrode of T8 connects positive source, base stage connects the source electrode of T6 by R16, drain electrode connects power cathode by buzzer BZ2, and the drain electrode of T7 connects the base stage of T8 by C6, the base stage of T7 is by the drain electrode of C7 connection T8, and C8 connects drain electrode and the power cathode of T8.

6, vibration sensing type infusion alarm according to claim 5 is characterized in that the audio alarm circuit also comprises filter capacitor C9.

7, vibration sensing type infusion alarm according to claim 1 is characterized in that the vibration signal amplifying circuit is combined by two RC coupling amplifiers.

8, according to claim 1,2,3,4,5,6 or 7 described vibration sensing type infusion alarms, it is characterized in that the preferred piezoelectric transducer of vibrating sensor.

9, according to claim or 2,3,4,5,6 or 7 described vibration sensing type infusion alarms, it is characterized in that the also discharge switch of double as capacitor C 5 of on and off switch K, the preferred DC3V of power supply.