CN114534017A - Method and system for monitoring contact state of infusion cannula and vein - Google Patents
Method and system for monitoring contact state of infusion cannula and vein Download PDFInfo
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
- A61M5/16836—Monitoring, detecting, signalling or eliminating infusion flow anomalies by sensing tissue properties at the infusion site, e.g. for detecting infiltration
Abstract
The embodiment of the invention provides a method and a system for monitoring a contact state of an infusion cannula and a vein, and relates to the field of medical systems. Aims to solve the problem that the contact state of the transfusion cannula and the vein is observed manually and the monitoring is not timely at present. The method comprises the steps of obtaining a first preset parameter representing the static pulse wave of an infusion object and a second preset parameter representing infusion noise; acquiring a first real-time parameter representing the real-time fluctuation frequency of liquid in the infusion tube; and removing a third real-time parameter representing real-time noise in the infusion process according to the first preset parameter, the second preset parameter and the first real-time parameter to obtain a second real-time parameter representing a real-time static pulse wave in the infusion process. The system for monitoring the contact state of the infusion cannula and the vein comprises a sensor and a controller. And analyzing and processing the first preset parameter, the second preset parameter and the first real-time parameter to obtain a second real-time parameter, and judging the contact state of the infusion cannula and the vein according to the second real-time parameter to realize intelligent monitoring.
Description
Technical Field
The invention relates to the field of medical systems, in particular to a method and a system for monitoring the contact state of an infusion cannula and a vein.
Background
In infusion therapy, the insertion and retention of an infusion cannula/cannula in a venous indwelling needle, and the use of an infusion port present problems such as catheter blockage, penetration of the indwelling needle through the vein causing penetration of commonly penetrating or corrosive drugs into its surrounding tissues, catheter dislocation, detachment of the catheter from the connection with the infusion port, etc. The probability of the occurrence of the problem, as an example of infiltration, was found to account for 8% of 2442 infusion patients who participated in the investigation of tokyo, japan, published in journal of infusion care.
At present, the problems are mainly discovered by the manual observation of medical care personnel and patients, which is often not timely enough, and the risk of the patients is increased.
Disclosure of Invention
The invention aims to provide a method for monitoring the contact state of an infusion cannula and a vein, which can solve the problem that the contact state of the infusion cannula and the vein is not monitored timely by means of manual observation at present.
The invention also aims to provide a system for monitoring the contact state of the infusion cannula and the vein, which can solve the problem that the contact state of the infusion cannula and the vein is not monitored timely by manual observation at present.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a method for monitoring the contact state of an infusion cannula and a vein, which comprises the following steps:
acquiring a first preset parameter representing a static pulse wave of an infusion object and a second preset parameter representing infusion noise;
acquiring a first real-time parameter representing the real-time fluctuation frequency of liquid in the infusion tube;
according to the first preset parameter, the second preset parameter and the first real-time parameter, removing a third real-time parameter representing real-time noise in the infusion process to obtain a second real-time parameter representing real-time static pulse wave in the infusion process;
and judging the contact state of the infusion cannula and the vein according to the second real-time parameter.
In addition, the method for monitoring the contact state of the infusion cannula and the vein provided by the embodiment of the invention can also have the following additional technical characteristics:
optionally: the step of removing the third real-time parameter representing the real-time noise in the infusion process according to the first preset parameter, the second preset parameter and the first real-time parameter to obtain the second real-time parameter representing the real-time static pulse wave in the infusion process comprises the following steps:
and if the difference value between the first preset parameter and the second preset parameter is larger than a first threshold value, filtering the third real-time parameter from the first real-time parameter, and separating the second real-time parameter.
Optionally: if the difference between the first preset parameter and the second preset parameter is greater than a first threshold, filtering the third real-time parameter from the first real-time parameter, and the step of separating the second real-time parameter includes:
and extracting the second real-time parameter from the first real-time parameter by means of digital signal processing filtering.
Optionally: the step of removing the third real-time parameter representing the real-time noise in the infusion process according to the first preset parameter, the second preset parameter and the first real-time parameter to obtain the second real-time parameter representing the real-time static pulse wave in the infusion process comprises the following steps:
and if the difference value between the first preset parameter and the second preset parameter is smaller than a first threshold value, controlling equipment generating noise to be closed, wherein the first real-time parameter is equal to the second real-time parameter.
Optionally: if the difference value between the first preset parameter and the second preset parameter is smaller than a first threshold value, controlling the equipment generating the noise to be closed, wherein the step that the first real-time parameter is equal to the second real-time parameter comprises the following steps:
the device generating the noise is turned off for a preset time and then turned on.
Optionally: the noise-generating device is an infusion pump.
Optionally: the step of obtaining a first preset parameter representing the venous wave of the transfusion object and a second preset parameter representing the transfusion noise comprises the following steps:
and measuring the transfusion object by a first measuring device to obtain the first preset parameter, and measuring a device generating noise by a second measuring device to obtain the second preset parameter.
Optionally: the step of obtaining a first preset parameter representing the venous wave of the transfusion object and a second preset parameter representing the transfusion noise comprises the following steps:
acquiring the first preset parameter through the statistical parameter of the existing transfusion object or the manual measurement of the transfusion object; and calculating and obtaining the second preset parameter through the infusion rate of the model.
Optionally: the step of judging the contact state of the infusion cannula and the vein according to the second real-time parameter comprises the following steps:
if the second real-time parameter is smaller than the third preset parameter, the infusion tube and the vein are in a falling state;
if the second real-time parameter is smaller than the fourth preset parameter, the infusion tube presses or even penetrates through the vein to enter the tissue;
wherein the third preset parameter is smaller than the fourth preset parameter.
The embodiment of the invention also provides a system for monitoring the contact state of the infusion cannula and the vein, which comprises a sensor, a controller and a controller, wherein the sensor is used for detecting a first real-time parameter which represents the real-time fluctuation frequency of the liquid in the infusion cannula;
the controller is communicated with the sensor and used for removing a third real-time parameter representing real-time noise in the infusion process according to a first preset parameter representing a static pulse wave of an infusion object, a second preset parameter representing infusion noise and the first real-time parameter to obtain a second real-time parameter representing the real-time static pulse wave in the infusion process and judging the contact state of the infusion cannula and the vein according to the second real-time parameter.
The method and the system for monitoring the contact state of the infusion cannula and the vein have the advantages that:
the method for monitoring the contact state of the infusion cannula and the vein comprises the steps of analyzing through a first preset parameter and a second preset parameter, removing a third real-time parameter representing real-time noise in the infusion process by combining the first real-time parameter, and obtaining a second real-time parameter representing a real-time static pulse wave in the infusion process; the contact state of the infusion cannula and the vein of the infusion object can be judged according to the second real-time parameter, and intelligent monitoring is realized. For example, if the second real-time parameter is far below the normal parameter so as to be difficult to identify, the infusion tube and the vein are in a falling state; if the second real-time parameter is obviously reduced compared with the normal parameter, the infusion tube presses and even penetrates through the vein wall to enter the tissue.
The system for monitoring the contact state of the infusion cannula and the vein comprises a sensor and a controller, wherein the sensor is used for detecting a first real-time parameter representing the real-time fluctuation frequency of liquid in the infusion cannula, and the controller obtains a second real-time parameter and a third real-time parameter according to the first preset parameter, the second preset parameter and the first real-time parameter, so that the real-time monitoring of the contact state of the infusion cannula and the vein of an infusion object is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a method for monitoring a contact state of an infusion cannula and a vein according to an embodiment of the present invention;
FIG. 2 is an example of a frequency spectrum of an infusion pump provided by an embodiment of the invention;
FIG. 3 is a block diagram of a system for monitoring the contact state of an infusion cannula with a vein according to an embodiment of the present invention;
fig. 4 is a frequency spectrum example of a quiet pulse wave measured by a flow sensor according to an embodiment of the present invention.
Icon: 10-liquid medicine box; 20-an infusion pump; 30-a sensor; 40-a controller; 50-an infusion tube; 60-external devices; 70-vein.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The following describes in detail the method and system for monitoring the contact state of the infusion cannula with the vein 70 according to the present embodiment with reference to fig. 1 to 4.
Referring to fig. 1, an embodiment of the present invention provides a method for monitoring a contact state of an infusion cannula with a vein 70, including: acquiring a first preset parameter representing a static pulse wave of an infusion object and a second preset parameter representing infusion noise; acquiring a first real-time parameter representing the real-time fluctuation frequency of the liquid in the infusion tube 50; according to the first preset parameter, the second preset parameter and the first real-time parameter, removing a third real-time parameter representing real-time noise in the infusion process to obtain a second real-time parameter representing real-time static pulse wave in the infusion process, and judging the contact state of the infusion cannula and the vein according to the second real-time parameter.
It should be noted that: the first preset parameter, the second preset parameter, the third preset parameter, the fourth preset parameter, the first real-time parameter, the second real-time parameter and the third real-time parameter are not single numbers and refer to characteristic spectral lines. For example, the first preset parameter refers to a characteristic spectrum of the static pulse wave of the infusion subject, and the typical values include a heart rate spectrum (e.g. 1Hz) and a respiration rate spectrum (e.g. 0.2Hz), as shown in fig. 4. Second preset parameter, as shown in fig. 2. The third real-time parameter refers to a characteristic spectral line of noise and is more than 2 Hz.
The first preset parameter and the second preset parameter are used as references for processing the first real-time parameter, the first preset parameter and the second preset parameter have different relations, and the third real-time parameter is removed from the first real-time parameter in different processing modes to obtain the second real-time parameter. The first preset parameter is set differently according to different infusion objects, and the second preset parameter is set differently according to different noise devices of the infusion device adopted in real time. In this embodiment, the noise-generating device is an infusion pump 20.
Specifically, the step of obtaining a first preset parameter representing the venous wave of the transfusion object and a second preset parameter representing the transfusion noise comprises the following steps: the first preset parameter is obtained by measuring the transfusion object through the first measuring device, and the second preset parameter is obtained by measuring the device generating the noise through the second measuring device.
Specifically, the step of obtaining a first preset parameter representing the venous wave of the transfusion object and a second preset parameter representing the transfusion noise comprises the following steps: acquiring a first preset parameter through the statistical parameter of the existing transfusion object or manually measuring the transfusion object; and calculating and obtaining a second preset parameter through the infusion rate of the model.
In particular, the first preset parameters include a respiration rate and a pulse rate (or heart rate) of the infusion subject. The second preset parameter includes a source of noise from the infusion device, such as fluctuations caused by movement (e.g., rotation, compression, peristaltic) of the infusion pump 20. Can be obtained in an online-to-offline manner, as shown in table 1:
TABLE 1
As another example, an approximate range of respiration rates and heart rates can be derived based on the age of the patient, such as adult respiration rates of 12-18 beats per minute (i.e., 0.2-0.3Hz) and heart rates of 59-99 beats per minute (i.e., 1-1.5 Hz). The change in the flow rate or pressure of the liquid generated by the infusion pump 20 when driving the liquid medicine is also fluctuating and is related to the infusion rate. For example, an electrically driven infusion pump 20 may have a motor speed of about 2.8 revolutions per second (2.8Hz) at an infusion rate of 10 mL/h. The fluctuations in the flow rate of the infusion liquid caused by the infusion pump 20 may be detected by the sensor 30 and converted to a frequency domain (the frequency spectrum of a particular infusion pump 20 motor-driven in fig. 2) for recognition by signal processing by the controller 40. Of course, the frequency spectra of several waves are not generally single frequency points, but rather have a set of characteristic spectral lines based on these frequencies and their resonant frequencies. With these features, they can be distinguished by means of digital filtering.
During infusion, since the medical fluid in the infusion tube 50 is communicated with the blood in the vein 70, the fluctuation in the blood is transmitted to the infusion tube 50 (the blood itself is not reversely flowed). Thus, the measured first real-time parameter is a composite feedback of the second real-time parameter and the third real-time parameter. According to the first preset parameter, the second preset parameter and the first real-time parameter, the third real-time parameter representing real-time noise in the infusion process is removed, the second real-time parameter representing real-time static pulse wave in the infusion process is obtained, and then the contact state of the infusion cannula and the infusion object vein 70 can be judged.
With reference to fig. 1, in this embodiment, the step of obtaining the contact state of the infusion cannula and the vein 70 according to the first preset parameter, the second preset parameter and the first real-time parameter includes: and if the difference value between the first preset parameter and the second preset parameter is larger than the first threshold value, filtering a third real-time parameter from the first real-time parameter, and separating the second real-time parameter.
In summary, the first preset parameter, the second preset parameter, the first real-time parameter, the second real-time parameter, and the third real-time parameter are not single numbers, and all refer to characteristic spectral lines. If the difference value between the first preset parameter and the second preset parameter is greater than the first threshold value, the third real-time parameter and the second real-time parameter can be effectively separated, and the typical case of effective separation is that the main frequencies of the first real-time parameter and the second real-time parameter are in different frequency intervals. Therefore, the difference between the first preset parameter and the second preset parameter is greater than the first threshold, that is, the frequencies represented by the first preset parameter and the second preset parameter are in different frequency intervals.
Referring to fig. 2, if the frequency spectrum obtained by the first predetermined parameter and the second predetermined parameter can be separated, for example, the second predetermined parameter-the main spectral line of the frequency spectrum of the motor noise at the predetermined infusion rate is above 2Hz, and the main spectral line of the first predetermined parameter-the respiratory rate (e.g. 0.2Hz) and the heart rate (e.g. 1Hz) signal is lower than that. They can now be separated by digital filtering, such as low pass filtering.
That is, if the difference between the first preset parameter and the second preset parameter is greater than the first threshold, the third real-time parameter is filtered from the first real-time parameter, and the step of separating the second real-time parameter includes: and extracting the second real-time parameters from the first real-time parameters in a digital signal processing filtering mode.
In particular, the processing of the first real-time parameters may employ a method of frequency domain analysis, such as Fast Fourier Transform (FFT), or other methods, such as wavelet analysis. The following is mainly explained by frequency domain analysis. In the infusion process, the time domain information of the flow/flow rate acquired by the sensor 30 is converted into frequency domain information through FFT. Then, spectral components (signature lines) of the respiration rate and pulse rate of interest are extracted in the frequency domain information. The extraction method mainly adopts digital signal processing and filtering (such as band-pass, high-pass, low-pass and the like). In addition, more complex digital signal processing methods such as notch filters and the like can be used.
With reference to fig. 1, in this embodiment, the step of obtaining the contact state of the infusion cannula and the vein 70 according to the first preset parameter, the second preset parameter and the first real-time parameter includes: and if the difference value between the first preset parameter and the second preset parameter is smaller than a first threshold value, controlling equipment generating noise to be closed, wherein the first real-time parameter is equal to the second real-time parameter.
The difference between the first preset parameter and the second preset parameter is smaller than the first threshold, that is, the frequency intervals represented by the first preset parameter and the second preset parameter are relatively close to each other, so that the third real-time parameter and the second real-time parameter cannot be effectively separated.
Specifically, if the difference between the first preset parameter and the second preset parameter is smaller than a first threshold, the step of controlling the equipment generating the noise to be closed, wherein the step of setting the first real-time parameter equal to the second real-time parameter comprises: the device generating the noise is turned off for a preset time and then turned on.
For example, when the dominant frequencies of the signal and noise are small or spectrally staggered and difficult to distinguish, the noise source (e.g., infusion pump 20) may be paused for a small time window (e.g., a duty cycle of 1 minute per hour) to leave only a portion of the valid signal (the first real-time parameter) to reach the sensor 30. When the infusion flow stops, the pulse wave will exhibit a bidirectional micro-flow or oscillation at the sensor 30, so that the sensor 30 with bidirectional flow sensing function will be more effective.
Referring to fig. 1, in the present embodiment, after the second real-time parameter and the third real-time parameter are obtained, the contact state between the infusion cannula and the infusion target vein 70 is determined. And timely monitoring of the contact state of the infusion cannula and the vein 70 is realized.
The second real-time parameter includes at least one parameter of both a real-time respiratory rate (respiratory rate) and a pulse rate (or heart rate) of the infusion subject. The pulse wave may be a respiration rate, a pulse rate, or a combined static pulse wave of a respiration rate and a pulse rate. The third real-time parameter is the real-time noise of the infusion system, primarily noise generated by the infusion pump 20.
If the second real-time parameter is smaller than the third preset parameter, the infusion tube 50 and the vein 70 are in a falling state; if the second real-time parameter is less than the fourth preset parameter, the infusion tube 50 compresses or even penetrates the vein 70 to enter the tissue; and the third preset parameter is smaller than the fourth preset parameter.
The "second real-time parameter is smaller than a third preset parameter" means that the second real-time parameter is far lower than a normal parameter so as to be difficult to identify, and the third preset parameter is set according to actual conditions.
The second real-time parameter is smaller than the fourth preset parameter, which means that the second real-time parameter is obviously reduced compared with the normal parameter, the fourth preset parameter is set according to the actual situation, the fourth preset parameter is smaller than the normal parameter, and the fourth preset parameter is larger than the third preset parameter.
Referring to fig. 3, in the present embodiment, the system for monitoring the contact state of the infusion cannula with the vein includes a sensor 30, the sensor 30 being configured to detect a first real-time parameter indicative of the real-time fluctuation frequency of the liquid in the infusion tube 50; the controller 40 is communicated with the sensor 30, and the controller 40 is used for removing a third real-time parameter representing real-time noise in the infusion process according to a first preset parameter representing a static pulse wave of an infusion object, a second preset parameter representing infusion noise and the first real-time parameter to obtain a second real-time parameter representing the real-time static pulse wave in the infusion process, and is used for judging the contact state of the infusion cannula and the vein according to the second real-time parameter.
Referring to fig. 3, in the present embodiment, the system for monitoring the contact state of the infusion cannula with the vein further includes an infusion tube 50, and the sensor 30 is disposed on the infusion tube 50. The sensor 30 needs to be in close proximity to the infusion cannula into the vein 70 so that a resting pulse wave can be detected and sensitivity increased.
Referring to fig. 3, in the present embodiment, the sensor 30 is a pressure sensor 30, the sensing signal is a pressure signal, and the controller 40 is configured to obtain a venous wave signal according to the pressure signal.
In other embodiments, the sensor 30 is a flow sensor 30, the sensing signal is a flow signal, and the controller 40 is configured to derive the venous wave signal according to the flow signal.
Referring to fig. 3, in the present embodiment, the infusion monitoring device further includes an infusion pump 20, and the infusion pump 20 is in communication with the second section and is configured to supply liquid to the second section. The infusion pump 20 may be active or passive (e.g., spring loaded). The infusion monitoring device is also suitable for regular infusions without the infusion pump 20. In other embodiments, gravity-based infusion may also be monitored.
Specifically, the infusion monitoring device further comprises a drug solution tank 10, the drug solution tank 10 being in communication with the infusion pump 20.
With continued reference to fig. 3, in the present embodiment, the infusion pump 20 is in communication with a controller 40, the controller 40 being configured to control the infusion pump 20 based on the sensor signals. The controller 40 controls the infusion pump 20 to be disconnected, and the fluctuation signal of the sensor 30 is mainly pulse wave. When the off time is up (e.g., seconds), the infusion pump 20 is turned on. The specific disconnection time is determined by the sampling requirement of the pulse wave, and in the case of fast Fourier transform, when the upper limit of the heart rate is considered to be times/minute (Hz), the number of sampling points and the sampling frequency are Hz, the required measurement time is about 6.4 seconds, and 10 seconds can be selected by adding redundancy.
After the respiration rate signal and the heart rate signal are taken out, the effectiveness is judged through the preset threshold values of frequency and amplitude, and whether the contact state of the infusion catheter/cannula and the vein 70 is normal or not is derived.
In addition, to further optimize information processing, data from other medical devices outside the infusion device, such as the respiratory rate obtained by a heart rate monitor and the heart rate obtained by an electrocardiograph, may be used to verify the accuracy and validity of the venous waves obtained by the controller 40.
Referring to fig. 3, an embodiment of the present invention further provides a system for monitoring a contact state of an infusion cannula with a vein, where the system for monitoring a contact state of an infusion cannula with a vein includes an external device 60 and an infusion monitoring apparatus, the external device 60 is in communication with the controller 40, and the external device 60 is configured to detect a respiration rate signal or a heart rate signal and output the signal to the controller 40.
Specifically, the external device 60 includes a heart rate monitor for detecting a heart rate signal, the heart rate monitor being in communication with the controller 40. Heart rate is extracted from the heart rate monitor for correlation with the heart rate measured in venous fluctuations.
In particular, the external device 60 also includes an electrocardiograph, which can detect the respiration rate signal.
In this embodiment, the system for monitoring the contact state of the infusion cannula and the vein further comprises a user terminal, which is in communication with the controller 40 and is used for displaying the monitoring state sent by the controller 40. Specifically, the user terminal includes a handheld device or console for nursing, and the handheld device and the console can display the monitoring status sent from the controller 40.
Referring to fig. 1, in the present embodiment, the user terminal further includes a display, the display is in communication with the controller 40, and the display is used for displaying the infusion state or the alarm signal. The controller 40 concludes by analyzing the state of the static pulse wave that the infusion tube 50 is connected, and then alerts and intervenes (e.g., pauses the infusion pump 20) locally or sends a message to a remote monitoring system.
The method and system for monitoring the contact state between the infusion cannula and the vein 70 provided by the embodiment at least have the following advantages:
the method of monitoring the contact status of the infusion cannula with the vein 70 changes the existing manual-based monitoring into real-time and intelligent. The time for manually discovering the infusion cannula loss of continuity or penetration is counted as minutes or even hours. The method for monitoring the contact state of the infusion cannula and the vein 70 can instantly find that the second real-time parameter is far lower than the normal parameter so as to be difficult to identify; in the case of infiltration, particularly when the infusion tube 50 is compressing or even penetrating the vein 70 into the tissue, rapid discovery can be achieved because the amplitude of the static pulse wave reaching the flow sensor 30 is significantly reduced.
The sensor 30 may be a flow sensor 30 or a pressure sensor 30. The application range is wide.
The external device 60 is introduced to obtain the first preset parameter and the second preset parameter, and the first real-time parameter is processed in a filtering mode or in a mode of closing the device generating noise as a judgment, so that the second real-time parameter is easier to obtain, and the intelligent monitoring of the contact state of the infusion cannula and the vein 70 is facilitated.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for monitoring the contact state of an infusion cannula and a vein is characterized by comprising the following steps:
acquiring a first preset parameter representing a static pulse wave of an infusion object and a second preset parameter representing infusion noise;
acquiring a first real-time parameter representing the real-time fluctuation frequency of liquid in the infusion tube (50);
according to the first preset parameter, the second preset parameter and the first real-time parameter, removing a third real-time parameter representing real-time noise in the infusion process to obtain a second real-time parameter representing real-time static pulse wave in the infusion process;
and judging the contact state of the infusion cannula and the vein according to the second real-time parameter.
2. The method for monitoring the contact state of an infusion cannula with a vein as claimed in claim 1, wherein:
the step of removing the third real-time parameter representing the real-time noise in the infusion process according to the first preset parameter, the second preset parameter and the first real-time parameter to obtain the second real-time parameter representing the real-time static pulse wave in the infusion process comprises the following steps:
and if the difference value between the first preset parameter and the second preset parameter is larger than a first threshold value, filtering the third real-time parameter from the first real-time parameter, and separating the second real-time parameter.
3. The method for monitoring the contact state of an infusion cannula with a vein as claimed in claim 2, wherein:
if the difference between the first preset parameter and the second preset parameter is greater than a first threshold, filtering the third real-time parameter from the first real-time parameter, and separating the second real-time parameter includes:
and extracting the second real-time parameter from the first real-time parameter by means of digital signal processing filtering.
4. The method for monitoring the contact state of an infusion cannula with a vein as claimed in claim 2, wherein:
the step of removing the third real-time parameter representing the real-time noise in the infusion process according to the first preset parameter, the second preset parameter and the first real-time parameter to obtain the second real-time parameter representing the real-time static pulse wave in the infusion process comprises the following steps:
and if the difference value between the first preset parameter and the second preset parameter is smaller than a first threshold value, controlling equipment generating noise to be closed, wherein the first real-time parameter is equal to the second real-time parameter.
5. The method for monitoring the contact state of an infusion cannula with a vein as claimed in claim 4, wherein:
if the difference value between the first preset parameter and the second preset parameter is smaller than a first threshold value, controlling the equipment generating the noise to be closed, wherein the step that the first real-time parameter is equal to the second real-time parameter comprises the following steps:
and the equipment generating the noise is started after being closed for a preset time.
6. The method for monitoring the contact state of an infusion cannula with a vein as claimed in claim 4, wherein:
the noise-producing device is an infusion pump (20).
7. The method for monitoring the contact state of the infusion cannula and the vein according to any one of claims 1 to 6, wherein:
the step of obtaining a first preset parameter representing the venous wave of the transfusion object and a second preset parameter representing the transfusion noise comprises the following steps:
and measuring the transfusion object by a first measuring device to obtain the first preset parameter, and measuring a device generating noise by a second measuring device to obtain the second preset parameter.
8. The method for monitoring the contact state of an infusion cannula with a vein according to any one of claims 1 to 6, wherein:
the step of obtaining a first preset parameter representing the venous wave of the transfusion object and a second preset parameter representing the transfusion noise comprises the following steps:
acquiring the first preset parameter through the statistical parameter of the existing transfusion object or the manual measurement of the transfusion object; and calculating and obtaining the second preset parameter through the infusion rate of the model.
9. The method for monitoring the contact state of an infusion cannula with a vein as claimed in claim 1, wherein:
the step of judging the contact state of the infusion cannula and the vein according to the second real-time parameter comprises the following steps:
if the second real-time parameter is smaller than the third preset parameter, the infusion tube and the vein are in a falling state;
if the second real-time parameter is smaller than the fourth preset parameter, the infusion tube presses or even penetrates through the vein to enter the tissue;
wherein the third preset parameter is smaller than the fourth preset parameter.
10. A contact state monitoring system of an infusion cannula and a vein is characterized by comprising:
a sensor (30), the sensor (30) for detecting a first real-time parameter indicative of a real-time fluctuation frequency of liquid within the infusion tube (50);
the controller (40) is communicated with the sensor (30), and the controller (40) is used for removing a third real-time parameter representing real-time noise in the infusion process according to a first preset parameter representing a static pulse wave of an infusion object, a second preset parameter representing infusion noise and the first real-time parameter to obtain a second real-time parameter representing the real-time static pulse wave in the infusion process, and is used for judging the contact state of the infusion cannula and the vein according to the second real-time parameter.
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