CN104014050B - A kind of on-line monitoring system - Google Patents

Abstract

The invention relates to an online monitoring system, which adopts a pulse counting method to monitor patients' infusion status online. The monitoring system includes an infusion pulse counting device, a drip speed online monitoring device, and an infusion monitoring terminal. The infusion pulse counting device and the drip speed The on-line monitoring device is connected, and the drip speed on-line monitoring device is connected with the infusion monitoring terminal through a wireless communication network; The signal is converted into an electrical signal and transmitted to the infusion monitoring terminal through the wireless communication network. The infusion monitoring terminal receives the electrical signal and compares it with the pre-stored standard drip rate to determine whether it is normal. Compared with the prior art, the invention has the advantages of safety, reliability, low power consumption and the like.

Description

An online monitoring system

technical field

The invention relates to the field of on-line monitoring, in particular to an on-line monitoring system.

Background technique

At present, intravenous infusion therapy is the most important way in terms of clinical medication. A survey shows that more than 90% of hospitalized patients need to adopt intravenous infusion therapy. In recent years, the medical problems caused by clinical infusion have attracted extensive attention of professionals.

If there is an online monitoring system for infusion status, which can give an alarm when the infusion is abnormal, and transmit the alarm information to the duty room of medical staff through signal transmission, then the safety of infusion therapy can be relatively improved. In addition, the use of online monitoring technology can greatly save manpower and time, enhance the scientificity and initiative of nurses' work, and at the same time realize full-time monitoring and provide timely assistance to infusion patients.

The existing infusion monitoring methods are as follows:

1. Probe-type monitoring: The infusion monitoring method used in the early days is: insert the probe into the infusion bottle, and because the liquid medicine is conductive, it will form a current loop with the probe. This current loop is broken when the liquid level drops below the probe tip level. The corresponding alarm mechanism will start and cut off the infusion. This is the probe monitoring method. The problem in the application of this method is the contradiction between cost and medical hygiene standards. From the perspective of cost reduction, the probe needs to be used multiple times, which does not meet the medical and health standards. So now this method is rarely used to monitor the infusion status.

2. Capacitive liquid level detection method: Capacitive liquid level detection method can be used to detect the height of the liquid level in the infusion bottle. The realization principle of this method is to use a signal of a certain frequency to excite the capacitive bridge. Since the capacitance value of the capacitive sensor will change with the change of the liquid level in the infusion bottle, the medical staff can output the signal through the capacitive bridge. The amplitude change judges the height of the remaining liquid level. The disadvantage of using the capacitive liquid level detection method is that the monitoring device needs to be installed around the infusion bottle, which is inconvenient for patients to move around during the infusion.

3. Gravimetric method: The gravimetric method is to use gravity sensors or springs to measure the overall weight of the infusion bottle and medicines. During the infusion process, due to the input of medicines into the human body, the weight of the infusion bottles and medicines will gradually decrease. The control circuit will be switched on when the specified weight is reached. However, due to the different sizes and materials of the infusion bottles and the density of the infusion medicines, judging the progress of the infusion only by the weight often leads to large errors.

4. Ultrasonic detection method: Ultrasonic detection method has high reliability. Its realization method is to install ultrasonic sensors at both ends of the infusion tube, and calculate the flow rate by calculating the transmission time difference of the sound beam in the two directions of forward flow and reverse flow, and then Calculates the infusion rate and volume of fluid infused. The disadvantage of ultrasonic detection method is that the cost of use is too high, and the economic benefit of using this method is low for hospitals.

Contents of the invention

The object of the present invention is to provide a safe, reliable and low-power on-line monitoring system in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

An online monitoring system, which adopts a pulse counting method to monitor the patient's infusion status online, and the monitoring system includes an infusion pulse counting device, a drip speed online monitoring device and an infusion monitoring terminal, and the infusion pulse counting device and the drip speed online monitoring device connected, the drip speed online monitoring device is connected to the infusion monitoring terminal through a wireless communication network, and the infusion monitoring terminal includes a connected drip speed acquisition device and a drip speed alarm device;

The infusion pulse counting device collects the dripping speed by means of pulse counting, and the drip speed online monitoring device converts the collected signal of the infusion pulse counting device into an electrical signal, and transmits it to the infusion monitoring terminal through the wireless communication network, and the infusion monitoring terminal receives the said Electrical signal, and compare it with the pre-stored standard drop rate to judge whether it is normal, if not, an alarm will be issued.

Preferably, the infusion pulse counting device includes a convex lens, an infusion set with a Murphy dropper and a photoresistor, the convex lens is arranged on one side of the Murphy dropper, and the photoresistor is provided with two , installed close to the other side of the Murphy dropper with the convex lens.

Preferably, the focal length of the convex lens matches the diameter of the Murphy dropper.

Preferably, the drip speed online monitoring device includes a photosensitive sensor channel, a differential amplifier circuit, a band-pass filter circuit, a voltage comparison circuit and a wireless signal sending circuit, and the photosensitive sensor channel, a differential amplifier circuit, and a band-pass filter circuit , the voltage comparison circuit and the wireless signal sending circuit are sequentially connected.

Preferably, the band-pass filter circuit includes a high-pass filter and a low-pass filter, and the high-pass filter and the low-pass filter are connected in series.

Preferably, the filter pass frequency of the band-pass filter circuit is 10-34Hz.

Preferably, both the high-pass filter and the low-pass filter are fourth-order filters.

Preferably, the wireless communication network is a ZigBee communication network.

Preferably, the wireless signal sending circuit is a ZigBee sending circuit.

Preferably, there are multiple infusion pulse counting devices and drip rate on-line monitoring devices.

Compared with the prior art, the present invention has the following advantages:

(1) The present invention uses natural light and light as a light source, and gathers light from the outside through a convex lens. When no liquid drops fall, the focus of light falls on the photosensitive element, so that no photoelectric emission is involved, and the inherent power consumption can be greatly reduced. And it has applicability in different light intensity environments;

(2) The present invention adopts photoresistor, photoresistor is sheet structure, is convenient to fix, photoresistor only one side photosensitive layer is affected by light intensity, has reduced the shielding requirement of terminal structure to external light source, directly photosensitive layer is close to dropper, with black Adhesive tape can be fixed;

(3) The present invention introduces a differential amplifier circuit in the drip speed online monitoring device, which greatly reduces the interference of external light intensity changes on the signal, and is safe and reliable;

(4) The band-pass filter circuit of the present invention adopts a fourth-order filter, which can further amplify the signal, so the amplitude of the voltage change is also more obvious when the droplet is dripping;

(5) The present invention adopts the ZigBee communication network, which has the advantages of low power consumption, high safety and reliability.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic structural diagram of an infusion pulse counting device;

Fig. 3 is the structural representation of drop speed on-line monitoring device;

4 is a schematic diagram of a circuit principle of a differential amplifier circuit;

FIG. 5 is a schematic diagram of the circuit principle of the voltage comparison circuit.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

As shown in Figure 1, an online monitoring system adopts the pulse counting method to monitor the patient's infusion status online, including an infusion pulse counting device 1, a drip speed online monitoring device 2, and an infusion monitoring terminal 3. The infusion pulse counting device 1 and the drip speed online The monitoring device 2 is connected, and the drip speed online monitoring device 2 is connected with the infusion monitoring terminal 3 through a wireless communication network. The infusion monitoring terminal 3 is a computer, and the wireless communication network may be a ZigBee communication network. The infusion pulse counting device 1 collects the dripping speed by pulse counting, and the drop speed online monitoring device 2 converts the signal collected by the infusion pulse counting device 1 into an electrical signal, and transmits it to the infusion monitoring terminal 3 through the wireless communication network. The terminal 3 receives the electrical signal and compares it with the pre-stored standard dripping speed to determine whether it is normal, and if not, an alarm is issued.

Multiple infusion pulse counting devices 1 and on-line drip rate monitoring devices 2 are provided, and the multiple on-line drip rate monitoring devices are respectively connected to the infusion monitoring terminal 3 through the ZigBee communication network to realize simultaneous monitoring of multiple monitoring points.

As shown in Figure 2, the infusion pulse counting device 1 includes a convex lens 11, an infusion set with a Murphy dropper 12, and a photosensitive resistor 13. The convex lens 11 is arranged on one side of the Murphy dropper 12, and the photosensitive Resistor 13 is provided with 2, arranges up and down, is close to and is installed on the opposite side of Murphy dropper 12 with convex lens 11, and the photosensitive layer of photoresistor 13 is close to dropper, is fixed with black adhesive tape. The convex lens 11 is irradiated with natural light and light as the light source, and the convex lens 11 gathers light from the outside. When a droplet passes through, the light intensity received by the photoresistor 13 will change due to the scattering of the light by the droplet, and then it is equivalent to the pulse counting method, counting the dripping droplets, thereby monitoring the dripping Condition.

The main factors to consider when selecting a convex lens are the focal length and the diameter of its outer circle. The focal length of the convex lens 11 matches the diameter of the Murphy dropper. For example, the diameter of the Murphy dropper used in the experiment is about 1.5cm, and the focal length can be selected at 1.5cm. -2cm convex lens, the outer diameter of the convex lens is also selected between 1.5-2cm.

As shown in Figure 3, drip speed on-line monitoring device 2 comprises photosensitive sensor channel 21, differential amplifier circuit 22, band-pass filter circuit 23, voltage comparison circuit 24 and wireless signal transmission circuit 25, described photosensitive sensor channel 21, differential amplifier The circuit 22, the band-pass filter circuit 23, the voltage comparison circuit 24 and the wireless signal sending circuit 25 are connected in sequence, and the wireless signal sending circuit 25 can be a ZigBee sending circuit.

The differential amplifier circuit 22 used in this embodiment is shown in FIG. 4 , and the circuit amplification factor of the differential amplifier circuit is 51kΩ/10kΩ, that is, 5.1 times.

The band-pass filter circuit 23 includes a high-pass filter and a low-pass filter, and the high-pass filter and the low-pass filter are connected in series. The filter pass frequency of the band-pass filter circuit 23 is 10-34 Hz. Both high-pass filter and low-pass filter are fourth-order filters.

The voltage comparator circuit 24 used in this embodiment is shown in FIG. 5 , and is designed based on the single-limit comparator circuit LM339. When Uin>UREF, the output of Uout is high level, that is, VCC=3.3V. When Uin<UREF, Uout output is low level, ie 0V.

Claims (9)

1. an on-line monitoring system, it is characterized in that, adopt step-by-step counting mode on-line monitoring patient fluid infusion's state, described monitoring system includes transfusion pulse counting equipment (1), drips speed on-Line Monitor Device (2) and infusion monitoring terminal (3), described transfusion pulse counting equipment (1) is connected with dripping speed on-Line Monitor Device (2), and described speed on-Line Monitor Device (2) of dripping is connected with infusion monitoring terminal (3) by cordless communication network；

Described transfusion pulse counting equipment (1) includes convex lens (11), transfusion device and photoconductive resistance (13) with murphy's dropper (12), described convex lens (11) is arranged on the side of murphy's dropper (12), described photoconductive resistance (13) is provided with 2, snugly fit to convex lens (11) opposite side just to murphy's dropper (12), with natural light with light for light source irradiation convex lens (11), convex lens (11) light to external world carries out optically focused, during dripless drippage, optically focused focus drops in photoconductive resistance (13)；

Transfusion pulse counting equipment (1) gathers drips speed in step-by-step counting mode, drip speed on-Line Monitor Device (2) and the collection signal of transfusion pulse counting equipment (1) is converted into the signal of telecommunication, and it is transferred to infusion monitoring terminal (3) by cordless communication network, infusion monitoring terminal (3) receives the described signal of telecommunication, and it is dripped speed with the standard prestored compare, judge whether normal, if it is not, then send warning.

2. a kind of on-line monitoring system according to claim 1, it is characterised in that the described focal length of convex lens (11) and the diameter of murphy's dropper match.

3. a kind of on-line monitoring system according to claim 1, it is characterized in that, a described speed on-Line Monitor Device (2) of dripping includes light sensor passage (21), differential amplifier circuit (22), bandwidth-limited circuit (23), voltage comparator circuit (24) and wireless signal transtation mission circuit (25), and described light sensor passage (21), differential amplifier circuit (22), bandwidth-limited circuit (23), voltage comparator circuit (24) and wireless signal transtation mission circuit (25) are sequentially connected with.

4. a kind of on-line monitoring system according to claim 3, it is characterised in that described bandwidth-limited circuit (23) includes high pass filter and low pass filter, described high pass filter and low pass filter series connection.

5. a kind of on-line monitoring system according to claim 3, it is characterised in that the filtering passband of described bandwidth-limited circuit (23) is 10-34Hz.

6. a kind of on-line monitoring system according to claim 4, it is characterised in that described high pass filter and low pass filter are four-step filter.

7. a kind of on-line monitoring system according to claim 1, it is characterised in that described cordless communication network is ZigBee communication network.

8. a kind of on-line monitoring system according to claim 3, it is characterised in that described wireless signal transtation mission circuit (25) is ZigBee transtation mission circuit.

9. a kind of on-line monitoring system according to claim 1, it is characterised in that described transfusion pulse counting equipment (1) and speed on-Line Monitor Device (2) are equipped with multiple.