CN104739400B - Automatic cardiac output measuring system - Google Patents

Automatic cardiac output measuring system Download PDF

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Publication number
CN104739400B
CN104739400B CN201310754546.1A CN201310754546A CN104739400B CN 104739400 B CN104739400 B CN 104739400B CN 201310754546 A CN201310754546 A CN 201310754546A CN 104739400 B CN104739400 B CN 104739400B
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China
Prior art keywords
cardiac output
liquid injection
measurement
main control
output measuring
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CN201310754546.1A
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Chinese (zh)
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CN104739400A (en
Inventor
左鹏飞
岑建
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Shenzhen Mindray Scientific Co Ltd
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Shenzhen Mindray Bio Medical Electronics Co Ltd
Shenzhen Mindray Scientific Co Ltd
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Priority to CN201310754546.1A priority Critical patent/CN104739400B/en
Priority to PCT/CN2014/077332 priority patent/WO2015100908A1/en
Publication of CN104739400A publication Critical patent/CN104739400A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/026—Measuring blood flow
    • A61B5/029—Measuring or recording blood output from the heart, e.g. minute volume
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/026—Measuring blood flow
    • A61B5/0275—Measuring blood flow using tracers, e.g. dye dilution
    • A61B5/028—Measuring blood flow using tracers, e.g. dye dilution by thermo-dilution
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
    • A61B5/6852—Catheters

Abstract

The invention discloses an automatic cardiac output measuring system which comprises a cardiac output measuring device, a liquid injection device and a main control device, wherein the cardiac output measuring device can be in signal connection with a temperature sensor at the front end of a floating catheter, the liquid injection device can inject cold liquid into the floating catheter, the main control device is in control connection with the liquid injection device, during measurement, the main control device controls the liquid injection device to be started and inject the cold liquid according to set injection parameters, and the cardiac output measuring device detects blood temperature through the temperature sensor and measures cardiac output. The liquid injection device is adopted to ensure the uniformity of cold liquid injection, and the accuracy and consistency of the cardiac output measurement result are ensured, so that accurate data can be provided for medical staff.

Description

Automatic cardiac output measuring system
Technical Field
The invention relates to a cardiac output measuring system, in particular to a cardiac output measuring system adopting a thermodilution method.
Background
A widely used method of monitoring cardiac output in the clinic is the thermodilution method. The thermodilution method is that a floating catheter is inserted into a pulmonary artery through the right atrium, then cold physiological saline is injected into the right atrium through the catheter, a temperature sensor is arranged at the front end of the catheter, when the cold physiological saline is mixed with blood and then changes in temperature, the mixed blood enters the pulmonary artery and is sensed by the temperature sensor, and the cardiac output is analyzed according to the injection time of the cold physiological saline and the change situation of the temperature after mixing.
When the thermodilution method is adopted, because the blood and the cold normal saline are mixed in the right atrium, the temperature change of the mixed blood and the cold normal saline is measured at the pulmonary artery (namely the front end of the floating catheter), and then the capability of shooting blood by the heart is measured. The heart shoots blood while mixing, and the whole measuring process is a dynamic process, so the injection speed and uniformity can directly influence the sufficiency of mixing the ice physiological saline and the blood, and the measuring result of the cardiac output is directly influenced.
In the existing cardiac output measuring system, the cold saline is usually injected manually by the medical staff, and the speed and uniformity of the injection speed of the cold saline and the interval and frequency of the injection are completely dependent on the experience of the medical staff, so the existing cardiac output measuring technology has the following disadvantages: 1) the injection experience of clinical care personnel can directly affect cardiac output measurements; 2) improper injection by clinical care personnel may damage the patient's heart function.
Disclosure of Invention
The invention provides an automatic cardiac output measuring system capable of improving the accuracy and consistency of cardiac output measuring results.
The invention provides an automatic cardiac output measuring system which comprises a cardiac output measuring device, a liquid injection device and a main control device, wherein the cardiac output measuring device can be in signal connection with a temperature sensor at the front end of a floating catheter, the liquid injection device can inject cold liquid into the floating catheter, the main control device is in control connection with the liquid injection device, during measurement, the main control device controls the liquid injection device to be started and injects the cold liquid according to set injection parameters, and the cardiac output measuring device detects blood temperature through the temperature sensor and measures cardiac output.
The cardiac output measuring device can measure cardiac output according to the blood temperature change curve.
The cardiac output measuring device can automatically measure, namely, the cardiac output measuring device does not need to receive the control instruction of the master control device; of course, the cardiac output value may be measured after receiving a control command from the master control device.
The master control device is in control connection with the cardiac output measuring device, so that the master control device can control the cardiac output measuring device to start measuring or stop measuring.
The main control device is directly connected with the cardiac output measuring device and the liquid injection device in a control way.
The main control device is in control connection with the liquid injection device through the cardiac output measuring device.
The cardiac output amount measuring device has an automatic measurement mode in which the cardiac output amount is automatically measured when the blood temperature change exceeds a certain threshold value within a specific time. After the cold liquid of lower temperature and the blood of higher temperature mix, blood temperature has a range of variation, and this scope can be through experimental statistics reachs many times, when detecting that blood temperature changes and is in this scope, can be in order to think that the system has got into measuring state, and at this moment, heart output measurement device can carry out heart output volume according to blood temperature change and measure.
The main control device is provided with an automatic protection mode, in the automatic protection mode, protection timing is carried out after measurement is finished, and before the protection timing is finished, the main control device enables the liquid injection device to be kept in an injection stopping state.
After the master control device receives the measuring result uploaded by the cardiac output measuring device, the measurement can be considered to be finished.
The invention has the beneficial effects that:
1) the liquid injection device is adopted to ensure the uniformity of cold liquid injection, and the accuracy and consistency of the cardiac output measurement result are ensured, so that accurate data can be provided for medical staff.
2) The main control device has an automatic protection mode, and can effectively avoid the injury to the patient caused by continuous repeated injection of cold liquid.
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 medical personnel, and the clinical usability is improved.
Drawings
Fig. 1 is a first block diagram of an automatic cardiac output measurement system according to the present embodiment;
fig. 2 is a block diagram showing a second configuration of the automatic cardiac output measurement system according to the present embodiment;
fig. 3 is a control flowchart of the automatic cardiac output measurement system according to the present embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
As shown in fig. 1 to 3, the automatic cardiac output 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 amount measuring device 2 can detect the blood temperature and measure the cardiac output amount according to the change curve of the blood temperature. The liquid injection device 3 can inject a cold liquid, which is a liquid that can be mixed with blood and has a temperature lower than that of blood, such as cold physiological saline or the like, in accordance with set injection parameters. The main control device 1 can control the cardiac output amount measuring device 2 and the liquid injection device 3.
The main control device can be in signal connection with the liquid injection device in a wireless or wired mode, can read working state information of the liquid injection device (such as whether the liquid injection device is in an injection starting state or an injection stopping state), sets cold liquid injection parameters (such as one or more of injection speed, injection amount, injection time, injection interval and the like), and can control the liquid injection device to start injection or stop injection. The main control device can be in signal connection with the cardiac output measuring device in a wireless or wired mode, and can control the cardiac output measuring device to start measuring or stop measuring and can receive measuring results and/or working state information uploaded by the cardiac output measuring device. The cardiac output measuring device is connected with a temperature sensor at the front end of the floating catheter through a temperature sensor interface. The liquid injection device is connected with the rear end of the floating guide pipe through a liquid pipeline. The floating catheter may be inserted into the pulmonary artery of the patient 4 through the right atrium.
The automatic cardiac output measuring system works as follows:
a) the main control device receives an instruction for starting the cardiac output quantity measurement or an instruction for triggering the cardiac output quantity measurement input by medical personnel and enters a measurement state; the triggering of the instruction for starting the measurement of the heart output quantity and the entering of the measurement state means that: the main control device can have an automatic measurement mode, and under the automatic measurement mode, the main control device can automatically enter a measurement state according to preset information of medical staff;
b) the master control device informs the heart output quantity measuring device to enter a measuring state;
c) the main control device informs the liquid injection device to evenly inject cold liquid into the floating duct according to the set injection speed and the injection amount;
d) the heart output quantity measuring device detects the blood temperature according to the temperature sensor at the front end of the floating catheter, measures the heart output quantity according to the change of the blood temperature, uploads the measuring result to the main control device for displaying and processing, and therefore the measurement is completed.
The main control device can have an automatic protection mode, under the mode, after the measurement is finished, the system enters a protection state and performs timing, before the protection timing is finished, the start-up of the cardiac output quantity measurement is forbidden, the liquid injection device is controlled to be always kept in a stop injection state, and discomfort and injury to the patient caused by frequent injection of cold liquid to the patient are avoided.
The cardiac output amount measuring device may have an automatic measurement mode in which the cardiac output amount measuring device detects a blood temperature change value in real time, and when the detected blood temperature change value exceeds a change threshold, cardiac output amount measurement is automatically performed according to the blood temperature change. The value range of the change threshold can be selected according to actual needs, for example, can be selected between 0.05 ℃ and 1 ℃.
The automatic cardiac output measuring system includes a main controller, a cardiac output measuring device and a liquid injector. The master control device may be directly connected to the cardiac output measuring device and the liquid injection device, that is, the master control device 1 may directly notify the cardiac output measuring device 2 to start/stop and notify the liquid injection device 3 to start/stop, respectively, as shown in fig. 1. The master control device 1 may also be indirectly connected to the liquid injection device 3 through the cardiac output measuring device 2, that is, the master control device notifies the liquid injection device of start/stop and injection parameters through the cardiac output measuring device, as shown in fig. 2.
For an automatic cardiac output measurement system, the cardiac output measurement device may have an automatic measurement mode, which may be automatically activated by the measurement device or may be notified of activation by the main control device.
For an automatic cardiac output measurement system, the master control device informs the liquid injection device of injection parameters, the selection of which can be set by medical personnel according to the age, physical condition and other specific conditions of a patient, and the injection parameters can include one or more of injection amount, injection speed, injection time, injection interval and the like. The uniformity of injection can be ensured by the structure of the liquid injection device itself, can also be ensured by closed-loop feedback control, or by controlling the propulsion speed.
For the automatic cardiac output measuring system, the main control device, the cardiac output measuring device and the liquid injection device may be integrated into a single device, or may be separately disposed and connected in a wireless or wired manner.
For the cardiac output automatic measurement system, the main control device may further receive setting information including cardiac output measurement related parameters and/or cardiac output automatic measurement start conditions, which is input by the user, and control the cardiac output measurement device and/or the liquid injection device according to the received setting information. Of course, after the main control device receives the setting information input by the user, the setting information can be stored.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.

Claims (9)

1. An automatic cardiac output measuring system is characterized by comprising a cardiac output measuring device, a liquid injection device and a main control device, wherein the cardiac output measuring device can be in signal connection with a temperature sensor at the front end of a floating catheter inserted into pulmonary artery of a patient, the liquid injection device can inject cold liquid into the floating catheter, the cold liquid can be mixed with blood and has a temperature lower than that of the blood, the main control device is in control connection with the liquid injection device, during measurement, the main control device controls the liquid injection device to start and inject the cold liquid according to set injection parameters, and the cardiac output measuring device detects the blood temperature through the temperature sensor and measures the cardiac output; the main control device is provided with an automatic protection mode, in the automatic protection mode, protection timing is carried out after measurement is finished, and before the protection timing is finished, the main control device enables the liquid injection device to be kept in an injection stopping state.
2. The automated cardiac output measurement system of claim 1, wherein the host device is in control communication with the cardiac output measurement device.
3. The system of claim 2, wherein the master device is directly connected to the cardiac output measuring device and the fluid injector.
4. The system of claim 2, wherein the master device is in control connection with the fluid injection device via the cardiac output measurement device.
5. The automated cardiac output measurement system of claim 2, wherein the master device is further configured to:
controlling the starting or stopping of the cardiac output measuring device; and/or
And receiving the measuring result and/or the working state information uploaded by the cardiac output measuring device.
6. The automated cardiac output measurement system of claim 2, wherein the master device is further configured to:
controlling the liquid injection device to stop injecting;
reading the working state information of the liquid injection device; and/or
Cold liquid injection parameters were set.
7. The system of claim 1, wherein the cardiac output measuring device has an automatic measurement mode in which the cardiac output measurement is automatically performed when the blood temperature changes over a certain threshold within a certain time.
8. The system of claim 1, wherein the host device is connected to the cardiac output measuring device or the fluid injection device via wireless or wired signal connection.
9. An automated cardiac output measurement system according to claim 5 or 6, wherein the master control device controls the cardiac output measurement device and/or the fluid injection device according to the received setting information input by the user.
CN201310754546.1A 2013-12-31 2013-12-31 Automatic cardiac output measuring system Active CN104739400B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201310754546.1A CN104739400B (en) 2013-12-31 2013-12-31 Automatic cardiac output measuring system
PCT/CN2014/077332 WO2015100908A1 (en) 2013-12-31 2014-05-13 Cardiac output automatic measuring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310754546.1A CN104739400B (en) 2013-12-31 2013-12-31 Automatic cardiac output measuring system

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CN104739400B true CN104739400B (en) 2020-09-15

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3364867B1 (en) * 2015-10-21 2023-03-22 Edwards Lifesciences Corporation Thermodilution injectate measurement and control
CN110507882A (en) * 2019-09-27 2019-11-29 四川省肿瘤医院 A kind of system of automatic conveying physiological saline

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4476877A (en) * 1982-08-16 1984-10-16 Gould Inc. Fluid temperature sensor
US4819655A (en) * 1987-08-04 1989-04-11 Webler William E Injectateless thermal cardiac output determination method and apparatus
US5037396A (en) * 1989-03-02 1991-08-06 Becton, Dickinson And Company Thermoelectric chiller and automatic syringe
ATE266962T1 (en) * 2001-03-01 2004-06-15 Pulsion Medical Sys Ag DEVICE, COMPUTER PROGRAM AND CENTRAL VENONY CATHETER FOR HEMODYNAMIC MONITORING
AU2003220474A1 (en) * 2002-03-21 2003-10-08 Radiant Medical, Inc. Measuring blood flow rate or cardiac output
US7630747B2 (en) * 2003-09-09 2009-12-08 Keimar, Inc. Apparatus for ascertaining blood characteristics and probe for use therewith
EP2062528B1 (en) * 2007-11-23 2012-03-14 Pulsion Medical Systems AG Central venous sensor assembly for measuring physiological data for cardiac output determination and method of determining cardiac output
DE102011114666A1 (en) * 2011-09-30 2013-04-04 Pulsion Medical Systems Se Device for hemodynamic monitoring

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WO2015100908A1 (en) 2015-07-09

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