WO2015100908A1

WO2015100908A1 - Cardiac output automatic measuring system

Info

Publication number: WO2015100908A1
Application number: PCT/CN2014/077332
Authority: WO
Inventors: 左鹏飞; 岑建
Original assignee: 深圳迈瑞生物医疗电子股份有限公司
Priority date: 2013-12-31
Filing date: 2014-05-13
Publication date: 2015-07-09
Also published as: CN104739400A; CN104739400B

Abstract

A cardiac output automatic measuring system includes a cardiac output measuring device (2), a liquid injection device (3) and a main control device (1). The cardiac output measuring device (2) can be in a signal connection with a temperature sensor at the front end of a floating catheter, cold liquid can be injected to the floating catheter by the liquid injection device (3), and the main control device (1) is in a control connection with the liquid injection device (3). In measurement, the liquid injection device (3) is controlled to start and inject cold liquid according to a set injecting parameter by the main control device (1) and blood temperature is detected through the temperature sensor and the cardiac output is measured by the cardiac output measuring device (2). The uniformity of the liquid injection is ensured by the liquid injection device (3), the accuracy and consistency of the result of the cardiac output measurement are guaranteed, and thus accurate data can be provided to medical personnel.

Description

Cardiac output automatic measurement system

Technical field

The present invention relates to a cardiac output measurement system, and more particularly to a cardiac output measurement system using a thermal dilution method.

Background technique

A widely used method for monitoring cardiac output in clinical practice is the thermodilution method. The thermodilution method is to insert a floating catheter into the pulmonary artery through the right atrium, and then inject cold physiological saline into the right atrium through the catheter. A temperature sensor is placed at the front end of the catheter, and the temperature changes after the cold physiological saline is mixed with the blood, and the mixed When the blood enters the pulmonary artery, it is sensed by the temperature sensor, and the cardiac output is analyzed based on the timing of the cold saline injection and the temperature change after mixing.

In the case of the thermodilution method, the blood and the cold saline are mixed in the right atrium, and the temperature change after mixing the blood and the cold physiological saline is measured at the pulmonary artery (ie, the front end of the floating catheter), thereby measuring the ability of the heart to eject blood. At the same time of mixing, the heart is also ejecting blood. The whole measurement process is a dynamic process, so the injection speed and uniformity directly affect the sufficiency of the mixing of ice physiological saline and blood, so the measurement of cardiac output is directly Impact.

In the existing cardiac output measurement system, cold saline injection is usually performed manually by a medical staff, and the speed and uniformity of the injection rate of the cold physiological saline and the interval and frequency of the injection are completely dependent on the experience of the medical staff. Therefore, the existing cardiac output measurement technology has the following disadvantages: 1) the clinical nurse's injection experience directly affects the cardiac output measurement result; 2) the improper injection of the clinical medical staff may damage the patient's cardiac function.

Summary of the invention

The present invention provides an automatic cardiac output measurement system capable of improving the accuracy and consistency of cardiac output measurement results.

The invention provides an automatic measurement system for cardiac output, comprising a cardiac output measuring device and a liquid injection

And a main control device, wherein the cardiac output measuring device is connectable with a temperature sensor signal at a front end of the floating catheter, the liquid injection device being capable of injecting cold liquid into the floating catheter, the main control device and the liquid injection The device controls the connection, the main control device controls the liquid injection device to start and injects cold liquid according to the set injection parameter, and the cardiac output measuring device detects the blood temperature and performs cardiac output measurement by the temperature sensor. .

The cardiac output measuring device can perform cardiac output measurement based on the blood temperature change curve.

The cardiac output measuring device can automatically measure, that is, it can not receive the control command of the main control device; of course, the cardiac output measurement can also be performed after receiving the control command of the main control device.

The main control device is connected to the cardiac output measuring device to enable the main control device to control the heart

The output measuring device starts the measurement or stops the measurement.

The main control device is directly connected to the cardiac output measuring device and the liquid injection device.

The main control device is controlled to be connected to the liquid injection device by the cardiac output measuring device.

The cardiac output measuring device has an automatic measuring mode in which the special measuring mode is

The cardiac output measurement is automatically performed when the blood temperature changes within a certain period of time exceeds a certain threshold. After the lower temperature cold liquid is mixed with the higher temperature blood, the blood temperature has a range of variation. The range can be calculated through multiple experiments. When the blood temperature change is detected in the range, the system can be considered to have entered. The measurement state, at this time, the cardiac output measurement device can perform cardiac output measurement according to the change in blood temperature.

The main control device has an automatic protection mode, in which the measurement ends

The line protection timing, the main control device keeps the liquid injection device in a stop injection state before the end of the protection timing.

After the main control device receives the measurement result uploaded by the cardiac output measuring device, the measurement can be considered to be completed.

The beneficial effects of the invention are:

1) The use of liquid injection device to ensure the uniformity of cold liquid injection, to ensure the accuracy and consistency of cardiac output measurement results, so as to provide accurate data for medical staff.

2) The main control device has an automatic protection mode, which can effectively avoid the damage caused by continuously injecting cold liquid to the patient.

3) The cardiac output measuring device can have an automatic measuring mode, so that the measurement can be automatically started according to the requirements of the medical staff, and the clinical ease of use is improved.

DRAWINGS

1 is a first structural block diagram of an automatic cardiac output measurement system according to the present embodiment;

2 is a second structural block diagram of the automatic cardiac output measurement system of the present embodiment;

Fig. 3 is a control flow chart of the cardiac output automatic measuring system of the present embodiment.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the cardiac output automatic measuring system of the present embodiment includes a cardiac output measuring device 2, a liquid injection device 3, and a main control device 1. The cardiac output measuring device 2 is capable of detecting blood temperature and performing cardiac output measurement based on a change in blood temperature. The liquid injection device 3 is capable of injecting a cold liquid which is a liquid which can be mixed with blood and whose temperature is lower than blood, such as cold physiological saline, etc., according to a set injection parameter. The main control device 1 is capable of controlling the cardiac output measuring device 2 and the liquid injection device 3.

The main control device can be connected to the liquid injection device by wireless or wired means, and the main control device can read the working state information of the liquid injection device (such as whether it is in the start injection state or stop the injection state), and set the cold liquid injection parameter (such as injection). One or more of speed, injection volume, injection time, injection interval, etc., and can control the liquid injection device to initiate or stop the injection. The main control device can be connected to the cardiac output measuring device signal wirelessly or by wire, and the main control device can control the cardiac output measuring device to start or stop the measurement, and can receive the measurement result and/or work uploaded by the cardiac output measuring device. status information. The cardiac output measuring device is connected to the temperature sensor at the front end of the floating catheter through a temperature sensor interface. The liquid injection device is connected to the rear end of the floating conduit through a liquid line. The floating catheter can be inserted into the pulmonary artery of patient 4 through the right atrium.

The working process of the cardiac output automatic measurement system is as follows:

a) The main control device receives the instruction of the starting cardiac output measurement input by the medical staff or triggers the start of the heart loss

The instruction of the output measurement enters the measurement state; the instruction to trigger the measurement of the cardiac output measurement, and the entry into the measurement state means that the main control device can have an automatic measurement mode, in which the measurement can be automatically entered according to the preset information of the medical staff. status;

b) the main control device notifies the cardiac output measuring device to enter the measurement state;

c) The main control device notifies the liquid injection device to uniformly float according to the set injection speed and the injection amount.

Floating pipe injects cold liquid;

d) The cardiac output measuring device detects the blood temperature according to the temperature sensor at the front end of the floating catheter, and according to the blood

The temperature change is performed to measure the cardiac output, and the measurement result is uploaded to the main control device for display and processing, thereby completing the measurement.

The main control device may have an automatic protection mode. In this mode, after the end of the measurement, the system enters the protection state and counts. Before the end of the protection timing, the cardiac output measurement is prohibited from being activated, and the liquid injection device is kept in the stop injection state. Avoid frequent injections of cold fluids into the patient and cause discomfort and injury to the patient.

The cardiac output measuring device may have an automatic measuring mode in which the cardiac output measuring device detects the blood temperature change value in real time, and automatically outputs the cardiac output according to the blood temperature change when the detected blood temperature change value exceeds the change threshold value. measuring. The value range of the change threshold can be selected according to actual needs, for example, can be selected between 0.05 ° C and 1 ° C.

For a cardiac output automatic measurement system, it includes a main control device, a cardiac output measurement device, and a liquid injection device. The main control device can be directly connected to the cardiac output measuring device and the liquid injection device, that is, the main control device 1 can directly notify the cardiac output measuring device 2 to start/stop and notify the liquid injection device 3 to start/stop, as shown in FIG. 1 . Show. The main control device 1 can also indirectly control the connection with the liquid injection device 3 through the cardiac output measuring device 2, that is, the main control device notifies the liquid injection device start/stop and injection parameters through the cardiac output measuring device, as shown in FIG.

For the cardiac output automatic measurement system, the cardiac output measuring device may have an automatic measurement mode that may be automatically initiated by the measuring device or may be initiated by the master device.

For the cardiac output automatic measuring system, the main control device notifies the liquid injection device of the injection parameter, and the selection of the injection parameter can be set by the medical staff according to the specific condition of the patient's age, physical condition, etc. The injection parameter can include the injection volume and the injection speed. One or more of injection time, injection interval, and the like. The uniformity of the injection can be ensured by the structure of the liquid injection device itself, or by closed loop feedback control, or by controlling the advancement speed.

For the cardiac output automatic measuring system, the main control device, the cardiac output measuring device and the liquid injection device can be integrated into one integral device, or can be separately arranged and connected by wireless or wired.

For the cardiac output automatic measurement system, the main control device can also receive setting information including a cardiac output measurement related parameter and/or a cardiac output automatic measurement activation condition input by the user, and control the cardiac output according to the received setting information. Measuring device and / or liquid injection device. Of course, after the master device receives the setting information input by the user, it can also store these.

The above is a further detailed description of the present invention in connection with the specific embodiments, and the specific embodiments of the present invention are not limited to the description. A number of simple derivations or substitutions may be made by those skilled in the art without departing from the inventive concept.

Claims

An automatic cardiac output measuring system, comprising: a cardiac output measuring device, a liquid injection device and a main control device, wherein the cardiac output measuring device is connectable with a temperature sensor signal at a front end of the floating catheter, the liquid injection The device is capable of injecting cold liquid into the floating conduit, and the main control device is in controlled connection with the liquid injection device. When measuring, the main control device controls the liquid injection device to start and inject cold liquid according to a set injection parameter. The cardiac output measuring device detects blood temperature by the temperature sensor and performs cardiac output measurement.
The cardiac output automatic measuring system according to claim 1, wherein said main control device is in control connection with said cardiac output measuring device.
The cardiac output automatic measuring system according to claim 2, wherein the main control device is directly connected to the cardiac output measuring device and the liquid injection device.
The cardiac output automatic measuring system according to claim 2, wherein said main control device is in controlled connection with said liquid injection device by said cardiac output measuring device.
The cardiac output automatic measuring system according to claim 2, wherein the main control device is further configured to:

Controlling the activation or deactivation of the cardiac output measuring device; and/or

Receiving measurement results and/or working state information uploaded by the cardiac output measuring device.
The cardiac output automatic measuring system according to claim 2, wherein the main control device is further configured to:

Controlling the liquid injection device to stop the injection;

Reading the working state information of the liquid injection device; and/or

Set the cold liquid injection parameters.
The cardiac output automatic measuring system according to claim 1, wherein said cardiac output measuring means has an automatic measuring mode, in which said blood temperature changes exceed a certain threshold value within a certain time period , automatic cardiac output measurement.
The cardiac output automatic measuring system according to claim 1, wherein said main control device has an automatic protection mode, wherein in said automatic protection mode, protection timing is performed after the measurement is finished, before the protection timing ends, The master device maintains the liquid injection device in a stop injection state.
The cardiac output automatic measuring system according to claim 1, wherein said main control device is signally connected to said cardiac output measuring device or liquid injecting device by wireless or wired means.
The cardiac output automatic measuring system according to claim 5 or 6, wherein said main control means controls said cardiac output measuring means and/or liquid injecting means based on the received setting information input by the user.