CN2873222Y

CN2873222Y - Vein dripping warning device

Info

Publication number: CN2873222Y
Application number: CN 200520121582
Authority: CN
Inventors: 肖志军
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-28
Filing date: 2005-12-28
Publication date: 2007-02-28
Anticipated expiration: 2015-12-28

Abstract

The utility model discloses a reliable alarm device for intravenous transfusion and the alarm device comprises a liquid level sensor which can be equipped in a transfusion bottle, a control circuit that is connected with the liquid level sensor and an alarm that is driven by the control circuit. The control circuit is a signal-detecting-amplifying circuit comprising an integrated circuit one input of that is connected with a divider resistor. The divider resistor is a pull-up resistor cross-over connected between the high-voltage input and the positive pole of the integrated circuit. The integrated circuit can also use an integrated chip that can generate sequential pulses. The high-voltage input and the high-voltage output of the integrated chip together form into the input of the signal-detecting-amplifying circuit. The utility model has the advantage of that the utility model is reliable and simple in the structure of circuit and has few affects on medicine liquid, and the detecting energy consumption is low. The utility model is especially suitable to monitor intravenous transfusions of the aged, children and critically ill patients.

Description

A kind of intravenous drip alarm device

Technical field

This utility model relates to medical electric measuring instrument, particularly a kind of intravenous drip auxiliary device.In order to find that in time the medicinal liquid in the infusion bottle drips off, thereby in time change medicinal liquid, the intravenous drip monitoring that this utility model provides a kind of intravenous drip alarm device to be applicable to patients such as hospital, family, the intravenous drip that is specially adapted to old man, child and severe case is monitored.

Background technology

When carrying out intravenous drip in hospital at present, after medicinal liquid drips off, if find untimelyly, blood back can take place, cause a lot of troubles, even have influence on therapeutic effect.

Existing intravenous drip alarm device such as China Patent No. CN02270195.8 disclose a kind of intravenous drip alarm device, form main body by amplification driving circuit, relay, power supply, amplification driving circuit is connecting the outside pair of metal pin that is with tapered medicated cap, and a speaker is arranged between relay and the power supply.The disclosed intravenous injection alarm of China Patent No. CN98219710.1, its major technique feature are that this alarm has housing, and warning electronic circuit, sounding component and source element are installed in it, and are electrically connected.Housing has two leads outward, and an end is connected with the needle-like metal bar electrode, and the other end is electrically connected with the intravital warning electronic circuit of shell.

The defective of prior art is: performance difficulty, and poor reliability, energy consumption is big.

Summary of the invention

The technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part, and a kind of reliable intravenous drip alarm device is provided.

This utility model is to solve the technical problem to adopt following technical scheme:

A kind of intravenous drip alarm device comprises the liquid level sensor that can insert infusion bottle, the control circuit that is electrically connected with liquid level sensor, and the alarm of control circuit promotion.Described control circuit is the signal detection amplifying circuit that contains integrated circuit, and an input of the integrated circuit in this signal detection amplifying circuit is connected with divider resistance.Described divider resistance is the resistance of drawing high that is connected across between integrated circuit high level input and the integrated circuit positive pole.When being low level integrated circuit with input when unsettled, described divider resistance is the resistance that drags down that is connected across between integrated circuit low level input and the integrated circuit negative pole.Described integrated circuit also can use the integrated chip that can produce time sequential pulse, this integrated chip high level input and integrated chip high level outfan constitute the input port of signal detection amplifying circuit jointly, and the outfan of integrated chip is exported the detection pulse at interval.

Liquid level sensor 1 can be selected the concentric bipolar electrode probe that can insert infusion bottle for use, also can select the instillation plug that has bipolar electrode for use.Alarm 3 is automatically controlled pronunciation device, or automatically controlled light-emitting device, or automatically controlled display device, or the combination of aforementioned several devices configuration.

Compare with prior art, use the advantage of a kind of intravenous drip alarm device of this utility model to be:

1. circuit is simple, and it is big that chip is chosen scope, and cost of manufacture is low, and stable performance is low in energy consumption, and volume is little.

2. because divider resistance R resistance is very big, reach mega-ohms, so electric current has only several microampere, the energy consumption that is used to detect is very little.

3. with one heart bipolar electrode probe or bipolar electrode instillation plug can be avoided because the omission phenomenon that the surface tension of medicinal liquid causes, the while is easy to operate, increases work efficiency.

4. when use can produce the IC chip of time sequential pulse, two electrodes of liquid level sensor were connected on high level input and high level outfan respectively, do not have voltage difference between two electrodes at ordinary times, and the influence that medicinal liquid is produced reduces to minimum degree.

Description of drawings

Fig. 1 is the logic block-diagram of a kind of intravenous drip alarm device of this utility model.

Fig. 2 is that the liquid level signal of a kind of intravenous drip alarm device of this utility model detects schematic diagram.

Fig. 3 is the liquid level signal testing circuit figure of a kind of intravenous drip alarm device of this utility model embodiment one.

Fig. 4 is that the liquid level signal of a kind of intravenous drip alarm device of this utility model embodiment one detects equivalent circuit diagram.

Fig. 5 is that the liquid level signal of a kind of intravenous drip alarm device of this utility model embodiment two detects equivalent circuit diagram.

Fig. 6 is the liquid level signal testing circuit figure of a kind of intravenous drip alarm device of this utility model embodiment three.

Fig. 7 is a kind of practical circuit of a kind of intravenous drip alarm device of this utility model embodiment three.

Fig. 8 is the structure chart of the concentric bipolar electrode probe of a kind of intravenous drip alarm device of this utility model.

The specific embodiment

Further specify embodiment of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the logic block-diagram of a kind of intravenous drip alarm device of this utility model, comprises the liquid level sensor 1 that can insert infusion bottle, the control circuit 2 that is electrically connected with liquid level sensor, and the alarm 3 of control circuit 2 promotions.Described control circuit 2 is for containing the signal detection amplifying circuit of IC.

Fig. 2 is that the liquid level signal of a kind of intravenous drip alarm device of this utility model detects schematic diagram, and IC input in is connected with divider resistance R among the figure.An input in of the just IC chip that must use, peripheral circuit need only divider resistance R, and circuit theory is extremely simple, thereby can select IC chip within a large range for use.Those functions are fairly simple when choosing, and in the time of realizing the chip of intravenous drip warning function device minimum requirements, the shared cost of IC can reduce greatly.Owing to adopted integrated circuit, can arbitrarily increase human-machine intelligence's interfaces such as LCD, LED, control key, can also send required various alarm signals by outfan, also have both advantages such as the stable performance that has integrated circuit to have, low in energy consumption, low price, volume be little simultaneously.

Fig. 3 is the liquid level signal testing circuit figure of a kind of intravenous drip alarm device of this utility model embodiment one, and divider resistance R is connected across to draw high resistance R H between the anodal VDD of IC high level input+in and integrated circuit.Its operation principle is such, when two electrodes of the liquid level sensor 1 of inserting infusion bottle during to the contact medicinal liquid, electric current is flowed to by the anodal VDD of IC and draws high resistance R H, and two electrode stream of the liquid level sensor 1 by the contact medicinal liquid are to the common port of IC again.Owing to draw high the resistance of the resistance of resistance R H much larger than medicinal liquid, so draw high most of voltage that resistance R H has divided power supply, at this moment the detected level of the input+in of IC is a low level, thinks that medicinal liquid also has.If the liquid level of medicinal liquid drops to two electrodes of liquid level sensor 1 when leaving medicinal liquid, two electrodes of liquid level sensor 1 are equivalent to open circuit, electric current is no longer drawn high the common port that resistance R H flows to IC by the anodal VDD process of IC, anodal VDD pulls into high level to the input+in of IC by drawing high resistance R H rapidly, at this moment to detect the level of its input+in be high level to IC, thinks that medicinal liquid has not had soon.Signal detection amplifying circuit comes to this by the high and low level variation of the input+in of IC, detects the liquid level of infusion bottle.After adopting such structure, will report to the police at once after the infusion bottle medicinal liquid drips off,, avoid causing unnecessary trouble so that in time change medicinal liquid.

Fig. 4 is that the liquid level signal of a kind of intravenous drip alarm device of this utility model embodiment one detects equivalent circuit diagram.The equivalent resistance R2 of figure herb liquid is connected across between IC high level input+in and the IC common port with after liquid level sensor equivalent switch S1 connects.

Fig. 5 is that the signal liquid level signal of a kind of intravenous drip alarm device of this utility model embodiment two detects equivalent circuit diagram.Using this connection, divider resistance R when level is low integrated circuit when selecting for use input unsettled is to be connected across to drag down resistance R L between IC low level input-in and the IC negative pole VSS.

Fig. 6 is the liquid level signal testing circuit figure of a kind of intravenous drip alarm device of this utility model embodiment three, and integrated circuit is for producing the integrated chip U of time sequential pulse.High level input+in of this integrated chip U and high level outfan+out of integrated chip U constitute the input port of signal detection amplifying circuit jointly, and outfan+out of integrated chip U exports the detection pulse at interval.Its operation principle is such, when two electrodes of the liquid level sensor 1 of inserting infusion bottle contact medicinal liquids, the outfan of integrated chip U+out output is high level at ordinary times, because two input terminal voltages of signal detection amplifying circuit all are high, at this moment do not have voltage difference between two of liquid level sensor 1 electrodes, do not have electric current yet.Periodically output low level pulse of outfan+out of integrated chip U, integrated chip U detects the level of its input+in then.In the low level pulse valid period, if two electrodes of liquid level sensor 1 all contact medicinal liquid, electric current just can flow to from the anodal VDD of integrated chip U draw high resistance R H, and two electrode stream of the liquid level sensor 1 by the contact medicinal liquid are to outfan+out of integrated chip U again.Owing to draw high the resistance of the resistance of resistance R H much larger than medicinal liquid, (drawing high the resistance big order of magnitude of the resistance of resistance R H) than medicinal liquid, so draw high that resistance R H divides but most of voltage of power supply, at this moment the detected level of input+in of integrated chip U is a low level, thinks that medicinal liquid also has.If the liquid level of medicinal liquid drops to two electrodes of liquid level sensor 1 when leaving medicinal liquid, two electrodes of liquid level sensor 1 are equivalent to open circuit, and at this moment to detect the level of its input+in be high level to integrated chip U, just can think that medicinal liquid has not had soon.

Be connected on the high level input+in of integrated chip U of signal detection amplifying circuit and high level outfan+out of integrated chip U when two electrodes of liquid level sensor 1 respectively, do not have voltage difference between two electrodes at ordinary times, can not cause the electrolysis behavior of medicinal liquid.When having only cycle (generally be ten seconds, can arbitrarily set as required) at certain time intervals, between two electrodes of liquid level sensor 1 voltage difference is arranged, current flowing is just arranged by the pulse of outfan+Millisecond of out output of integrated chip U.Because to draw high resistance R H resistance very big, reach mega-ohms, medicinal liquid the pulse current of Millisecond by the time electric current that takes place have only several microamperes, so electric current is very little to the influence that medicinal liquid produces, the energy consumption that is used to detect is also very little.

Fig. 7 is a kind of practical circuit of a kind of intravenous drip alarm device of this utility model embodiment three, be 4 single-chip microcomputer U1 that adopt Taiwan winbond company, the IMP809R voltage checking chip U2 of IMP company and 2 intelligent intravenous drip alarms that LCD module U3 makes with monitoring running status and display power supply electric weight.Comprise start stop switch S2 among the figure, silence switch S3, buzzer SP.4 single-chip microcomputer U1 start to control to make and use, it is by the detection pulse signal of outfan RA0 output certain hour gap periods, liquid level signal input RC0 detects the signal of medicinal liquid equivalent resistance R2 and liquid level sensor equivalent switch S1, power supply signal input RC1 detects the voltage signal from voltage checking chip U2, start stop signal input RC2 detects the push button signalling of start stop switch S2, and mute signal input RC3 detects the push button signalling of silence switch S3.Comprise also among the figure that liquid level signal draws high resistance R H, power supply signal is drawn high resistance R 3, and start stop signal is drawn high resistance R 4, and mute signal is drawn high resistance R 5.Single-chip microcomputer U1 can directly drive LCD module U3 by the LCD pin and show after receiving various signals, can directly drive the chimes of doom that buzzer SP sends different frequency by the MFP pin.Voltage checking chip U2 plays voltage monitoring effect, and it can give the power supply signal input RC1 of single-chip microcomputer U1 by RESET foot output low level signal when supply voltage is lower than 2.63V.The equivalent resistance R2 that draws high resistance R H, medicinal liquid is with after liquid level sensor equivalent switch S1 connects, and is connected across between the outfan RA0 of the anodal VDD of single-chip microcomputer U1 and single-chip microcomputer U1.Because the resistance ratio of medicinal liquid is big (contact area of electrode and medicinal liquid is all relevant for the kind of resistance and medicinal liquid, the distance of two electrodes, and the upper limit is 300K Europe in the example of this alarm), draws high resistance R H and adopt 3M Europe.

This intravenous drip alarm device is work like this: when connecting with the mains, start stop switch S2 is effective, play opening and closing, medical personnel are used for starting and closing this alarm device, at any time can both the opening and closing alarm device under the competent situation of power supply.Silence switch S3 is to invalid, and patient can be chimes of doom by stopping after alarm device sends chimes of doom, but do not trigger report to the police before (being under the competent situation of medicinal liquid) be inoperative.Silence switch S3 can move patient on hand by lead-in wire, allow patient hear that chimes of doom is known the medicinal liquid deficiency after, can own chimes of doom be stopped, chimes of doom does not disturb others with regard to not understanding more like this, can also reach energy-conservation effect.LCD module U3 has 2 points, a bit is the operation indication.When the power supply abundance of alarm device, two electrodes of liquid level sensor 1 all contact medicinal liquid, and medical personnel just light after opening alarm device, show that alarm device begins operate as normal.The not enough indication of the on the other hand electric weight of LCD module U3, when voltage checking chip U2 detects undertension, can send the power supply signal input RC1 of a pulse by the RESET port to single-chip microcomputer U1, single-chip microcomputer U1 just lights the electric weight of LCD module U3 deficiency after knowing undertension, medical personnel just can know to be needed to have changed battery, and this alarm device just can be worked reliably like this.

Liquid level sensor 1 can be selected the concentric bipolar electrode probe that can insert infusion bottle for use, and the structure of bipolar electrode probe is seen Fig. 8 with one heart, comprises the interior metal electrode 11 of probe, the insulating barrier 12 of probe, the outer metal electrode 13 of probe.The medicinal liquid that has adopted concentric bipolar electrode probe can well avoid the surface tension owing to medicinal liquid to cause drips off the omission phenomenon that two electrodes also have the medicinal liquid short circuit, and two probes that in contrast to prior art simultaneously can also handled easily, increases work efficiency.

The workflow of this intravenous drip alarm device is as follows:

Claims

1. an intravenous drip alarm device comprises the liquid level sensor (1) that can insert infusion bottle, the control circuit (2) that is electrically connected with liquid level sensor (1), and the alarm (3) of control circuit (2) promotion; It is characterized in that: described control circuit (2) is for containing the signal detection amplifying circuit of integrated circuit.

2. alarm device according to claim 1 is characterized in that: an input of the integrated circuit in the described signal detection amplifying circuit is connected with divider resistance (R).

3. alarm device according to claim 2 is characterized in that: described divider resistance (R) for be connected across integrated circuit high level input (+draw high resistance (RH) in) and between the integrated circuit positive pole (VDD).

4. alarm device according to claim 2 is characterized in that: described divider resistance (R) (drags down resistance (RL) in) and between the integrated circuit negative pole (VSS) for being connected across integrated circuit low level input.

5. alarm device according to claim 2 is characterized in that: the integrated circuit in the described signal detection amplifying circuit is for producing the integrated chip (U) of time sequential pulse.

6. alarm device according to claim 5 is characterized in that: described integrated chip (U) high level input (+in) with integrated chip (U) high level outfan (+out) be the input port of signal detection amplifying circuit.

7. alarm device according to claim 2 is characterized in that: described liquid level sensor (1) is for inserting the concentric bipolar electrode probe of infusion bottle.

8. alarm device according to claim 2 is characterized in that: described liquid level sensor (1) is for inserting the instillation plug that has bipolar electrode of infusion bottle.

9. alarm device according to claim 2 is characterized in that: described alarm (3) is automatically controlled pronunciation device, or automatically controlled light-emitting device, or automatically controlled display device, or the combination of aforementioned means.