CN103202691B - Method and device for improving electrocardiogram waveform data printing efficiency - Google Patents

Abstract

The invention relates to the processing and controlling field of electrocardiogram signal printing, and particularly relates to a method and device for improving an electrocardiogram waveform data printing efficiency. According to the technical scheme provided by the invention, judgment of the point number for a printed waveform is carried out by setting a threshold value of the printing point number to further realize point extraction process, so that the printing power can be controlled, and a thermo-sensitive head is protected from being overheated due to the printing; and meanwhile, the repeated printing time number can be reduced, and the service life of the printing head can be prolonged.

Description

A method and device for improving the printing efficiency of ECG waveform data

technical field

The invention relates to the field of processing and control of electrocardiographic signal printing, in particular to a method and device for improving the printing efficiency of electrocardiographic waveform data .

Background technique

In the field of medical testing, waveform data is of great significance. By collecting waveform data representing physiological signals in real time, it provides strong support for subsequent data processing, analysis and calculation.

At present, the existing technology uses heat sensitivity to record ECG data, and all the collected data are sent to the thermal head for recording.

Taking the dot density of the thermal print head as 8 dots/mm as an example, the print head generally prints vertically. When the dot density of the thermal head is 8 dots/mm, that is, the thermal report can print up to 8 dots in the longitudinal direction of 1mm, 1mm After printing 8 dots, the printing effect is connected together, and they cannot be distinguished.

The heating point of the thermal print head is evenly heated, and it will be displayed on the paper horizontally due to the paper feeding. In this case, the printing effect is the same as that of the vertical direction. Then the thermal report prints 8 points within 1mm in the horizontal direction. From the printing effect It is also connected together, more than 8 dots will overlap in printing, the printing effect is that these dots cannot be distinguished, but the color will be darker.

Based on this point, we can see that when the prior art records ECG data and the printed data exceeds a certain number of points (for example, 8) within a certain distance (for example, 1mm), there is a situation of repeated recording, which shortens the The life of the thermal head also wastes resources and reduces efficiency.

Therefore, the prior art has deficiencies .

Contents of the invention

In order to overcome the above defects, the object of the present invention is a method and device for improving the printing efficiency of ECG waveform data.

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

A method for improving the printing efficiency of electrocardiographic waveform data, comprising the steps of:

Step 1, storing the collected ECG waveform data into the data buffer;

Step 2, calculate the number of sampling points within the preset duration according to the preset ECG waveform data sampling rate;

Step 3, judging whether the number of effective sampling points within the preset duration exceeds the preset point threshold;

Step 4, if the preset points threshold is exceeded, the valid sampling points within the preset time period are sampled;

Step 5, if the preset dot threshold is not exceeded, the thermal print head prints the ECG waveform data.

Further, the step 4 further includes returning to step 4 after the snapshot processing is completed.

Furthermore, before step 1, a step of preprocessing the collected ECG waveform data is also included.

Furthermore, after the step 2, it also includes the step of establishing a two-dimensional array of ECG waveform data whose column number is the number of sampling points within the preset time length.

Furthermore, the step 3 also includes the step of traversing the two-dimensional array row by row, and judging whether the valid waveform data of each row exceeds a preset point threshold.

Furthermore, the snapping process described in step 4 includes starting from the beginning of the line and counting the effective waveform data point by point until reaching the point threshold range, and the remaining waveform data is deleted without printing.

Furthermore, the sampling processing described in step 4 includes starting from the end of the line and counting the effective waveform data point by point until reaching the point threshold range, and the remaining waveform data is deleted without printing.

Furthermore, the sampling processing described in step 4 includes randomly extracting valid waveform data until reaching the point threshold range, and deleting the remaining waveform data without printing.

A device for improving the printing efficiency of ECG waveform data, comprising:

Waveform data acquisition module, used to collect ECG waveform data;

The waveform data buffer module is connected with the waveform data acquisition module, and is used to store the collected ECG waveform data into the data buffer;

The number of sampling points calculation module is connected with the waveform data buffer module, and is used to calculate the number of sampling points within the preset duration according to the preset ECG waveform data sampling rate;

Points threshold judgment module, connected to the sampling points calculation module, used to judge whether the effective sampling points within the preset duration exceed the preset points threshold;

The waveform data sampling module is connected to the point threshold judgment module, and is used to perform sampling processing on the effective sampling points within the preset time length when the judgment exceeds the preset point threshold;

The thermal printing module is connected with the dot threshold judging module, and is used for printing ECG waveform data by the thermal print head when it is judged that the preset dot threshold is not exceeded.

Further, the described device for improving the printing efficiency of ECG waveform data also includes:

Waveform data preprocessing module, connected with the waveform data acquisition module and waveform data buffer module, for preprocessing the collected ECG waveform data;

The two-dimensional array establishment module is connected with the sampling points calculation module and the points threshold judgment module, and is used to establish a two-dimensional array of ECG waveform data whose column number is the sampling points within the preset time length.

The technical scheme provided by the present invention can judge the number of printed waveforms by setting the threshold of printing points, and then realize the sampling process, so that the printing power can be controlled, and the thermal head can be protected from overheating due to printing; at the same time, the number of repeated printing can be reduced. Extend print head life.

Description of drawings

For ease of illustration, the present invention is described in detail by the following preferred embodiments and accompanying drawings.

Fig. 1 is a schematic diagram of an embodiment of a method for improving the printing efficiency of ECG waveform data of the present invention;

Fig. 2 is a schematic diagram of another embodiment of a method for improving the printing efficiency of ECG waveform data according to the present invention;

Fig. 3 is a schematic diagram of an embodiment of a device for improving the printing efficiency of ECG waveform data according to the present invention;

Fig. 4 is a schematic diagram of another embodiment of a device for improving the printing efficiency of ECG waveform data according to the present invention;

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The implementation of the technical solution for improving the printing efficiency of waveform data mainly includes the upper computer and the lower computer. The lower computer mainly obtains the signal, and then processes the data through hardware filtering, etc.; the upper computer mainly receives the data from the lower computer and performs preprocessing. , and then stored in the data buffer for sampling processing, and finally output to the thermal print head, the main processing method flow chart is shown in Figure 1:

101. Collect ECG waveform data;

The lower computer collects ECG waveform data within a predetermined period of time, and generally sends the waveform data to the upper computer continuously after processing such as hardware filtering.

102. Store the collected ECG waveform data into the data buffer;

ECG waveform data is stored in the object used by the user front end to store and manipulate data, that is, the data buffer.

103. Calculate the number of sampling points within the preset duration according to the preset ECG waveform data sampling rate;

For example, when the sampling rate of ECG waveform data is 1000 Hz and the preset duration is 50 ms, the number of points collected within the preset duration is 1000*0.05=50 points.

104. Determine whether the number of effective sampling points within the preset duration exceeds the preset point threshold?

The thermal print head generally prints vertically. When the dot density of the thermal head is D (dots/mm), that is, the thermal report can print up to D dots in the longitudinal direction of 1mm; the heat of the thermal print head is evenly heated, because The paper will be displayed horizontally on the paper when it is fed. In this case, the printing effect is the same as that of the vertical direction. Then the printing within 1mm in the horizontal direction of the thermal report can be limited to D dots, and if more than D dots, printing overlap will occur. Therefore, the dot threshold can be obtained from thermal head dot density, preset paper speed and preset time. For example: when the dot density of the thermal head specification is D (Dots/mm), when the paper feeding speed is V (mm/s), the preset time is t (s), then the dot threshold is D*V*t , of course, you can also set the appropriate dot density of the thermal head according to the experimental results and effects, and then determine the dot threshold according to the paper speed and preset time;

For the data generally collected at each sampling point, it can be judged whether it is valid data or invalid data according to the size, type, etc. of the data.

105. If it is judged that the number of points exceeds the preset point threshold, the number of effective sampling points within the preset time period is sampled;

Perform sampling processing to limit the number of valid waveform data within the threshold range of points. There are many methods of sampling processing, for example, extraction from the beginning, extraction from the end, random extraction, extraction with a certain data size threshold range, or The extraction is performed with a threshold range of the difference between adjacent data; after the extraction process is completed, return to step 104 for judgment.

106. If it is judged that the preset point threshold is not exceeded, the thermal print head prints the ECG waveform data;

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. As shown in Figure 2, another embodiment of a method for improving the printing efficiency of ECG waveform data according to the present invention is specifically described as follows:

201. Collect ECG waveform data;

The lower computer collects ECG waveform data within a predetermined period of time, and generally sends the waveform data to the upper computer continuously after processing such as hardware filtering.

202. Preprocessing the collected ECG waveform data;

Perform the following preprocessing on the waveform data: data conversion, high-pass filtering, low-pass filtering, and AC filtering. Waveform data with less interference is obtained through preprocessing.

Of course, there are many preprocessing methods, such as derivation, integration, reference point positioning, and so on.

203. Store the preprocessed ECG waveform data in the data buffer;

ECG waveform data is stored in the object used by the user front end to store and manipulate data, that is, the data buffer.

204. Calculate the number of sampling points within the preset duration according to the preset ECG waveform data sampling rate;

For example, when the sampling rate of ECG waveform data is 1000 Hz and the preset duration is 50 ms, the number of points collected within the preset duration is 1000*0.05=50 points.

205. Establishing a two-dimensional array of ECG waveform data whose column number is the number of sampling points within a preset duration;

Establish a two-dimensional array. The total number of columns of the array is the number of sampling points within a preset time. The total number of rows of the array is preferably less than or equal to the maximum number of points that can be printed vertically by the thermal head. Due to the limitation of the length of the thermal print head, therefore The length of printing in the vertical direction also has its fixed range, and the data to be printed must be within this range to be completely printed; the establishment of a two-dimensional array is more convenient for subsequent data extraction and printout, and improves work efficiency; of course, other storage data and analysis methods, such as through array pointers.

206. Traversing the two-dimensional array row by row, and judging whether the valid waveform data of each row exceeds the preset point threshold?

The thermal print head generally prints vertically. When the dot density of the thermal head is D (dots/mm), that is, the thermal report can print up to D dots in the longitudinal direction of 1mm; the heat of the thermal print head is evenly heated, because The paper will be displayed horizontally on the paper when it is fed. In this case, the printing effect is the same as that of the vertical direction. Then the printing within 1mm in the horizontal direction of the thermal report can be limited to D dots, and if more than D dots, printing overlap will occur. Therefore, the dot threshold can be obtained from thermal head dot density, preset paper speed and preset time. For example: when the dot density of the thermal head specification is D (Dots/mm), when the paper feeding speed is V (mm/s), the preset time is t (s), then the dot threshold is D*V*t , of course, you can also set the appropriate dot density of the thermal head according to the experimental results and effects, and then determine the dot threshold according to the paper speed and preset time;

For the data generally collected at each sampling point, it can be judged whether it is valid data or invalid data according to the size, type, etc. of the data.

207. If it is judged that the threshold value of the number of points exceeds the preset point value, the effective waveform data of each row is sampled;

Traversing the two-dimensional array row by row, when the number of valid waveform data in a certain row exceeds the point threshold, perform sampling processing to limit the number of valid waveform data within the range of the point threshold;

Since the extraction of two-dimensional array elements is carried out in units of rows, the extraction method is as follows:

1) Starting from the beginning of the line, the valid waveform data is counted point by point until it reaches the point threshold range, and the remaining waveform data is deleted and not printed;

2) Starting from the end of the line, count the valid waveform data point by point until it reaches the point threshold range, and delete the remaining waveform data without printing;

3) Randomly extract valid waveform data until it reaches the point threshold range, and delete the remaining waveform data without printing;

The following example is briefly explained:

When the paper feeding speed is 5mm/s, the dot density of the print head is 8 dots/mm, the total number of hot spots of the printed hair is 24 dots (the length printed in the vertical direction of the thermal print head), the sampling rate is 1000Hz, and the preset time is 50ms, the preset The number of time collection points is 1000*0.05=50 points, and a two-dimensional array a[50][24] is established, and the initial value of all elements of the array is 0; the point threshold can be 8*5*0.05=2 points;

The data collected within the preset time is stored in the above-mentioned two-dimensional array. If the data collected in the first (ms) amplitude is 10, then set a[0][9] to 1, which means it is marked as printable;

Traverse the two-dimensional array a[50][24] row by row. When the number of 1 elements in a certain row exceeds 2 points, perform sampling processing to limit the number of 1 elements in each row to 2;

For example, to traverse the elements of the second row, a[0][1], a[1][1], ..., a[49][1], when the total number of elements counted as 1 exceeds the point threshold 2, then Sampling is required, and the total number of elements in this behavior 1 is limited to 2;

The sampling method is as follows:

1) You can set a[0][1], a[1][1] to 1, and set the remaining array elements in the row to 0;

2) You can set a[48][1], a[49][1] to 1, and set the remaining array elements in the row to 0;

3) Randomly select two elements as 1, for example, set a[12][1] and a[26][1] to 1, and set the remaining array elements in the row to 0;

Of course, other snapshot methods are also possible, as described in step 105 .

After the extraction process is completed, return to step 206 for judgment.

208. If it is judged that the preset point threshold is not exceeded, the thermal print head prints the ECG waveform data;

A schematic diagram of an embodiment of a device for improving the printing efficiency of ECG waveform data according to the present invention, as shown in FIG. 3 , and is specifically described as follows:

A device for improving the printing efficiency of ECG waveform data, comprising:

Waveform data acquisition module 301, used for collecting ECG waveform data;

Waveform data buffering module 302, is connected with described waveform data acquisition module 301, is used for storing the electrocardiogram waveform data of collection into data buffer;

The number of sampling points calculation module 303 is connected with the waveform data buffer module 302, and is used to calculate the number of sampling points within the preset time length according to the preset ECG waveform data sampling rate;

Points threshold judgment module 304, connected to the sampling points calculation module 303, for judging whether the valid sampling points within the preset duration exceed the preset points threshold;

The waveform data sampling module 305 is connected with the point threshold judging module 304, and is used to perform sampling processing on the effective sampling points in the preset duration when the judgment exceeds the preset point threshold;

The thermal printing module 306 is connected with the dot threshold judging module 304, and is used for printing ECG waveform data by the thermal print head when it is judged that the preset dot threshold is not exceeded.

In order to make the purpose, technical solution and advantages of the present invention clearer, a schematic diagram of another embodiment of a device for improving the printing efficiency of ECG waveform data in the present invention, as shown in Figure 4, is specifically described as follows:

A device for improving the printing efficiency of ECG waveform data, further comprising:

The waveform data preprocessing module 307 is connected with the waveform data acquisition module 301 and the waveform data buffer module 302, and is used for preprocessing the collected ECG waveform data;

The two-dimensional array building module 308 is connected with the sampling points calculation module 303 and the points threshold judgment module 304, and is used to establish a two-dimensional array of ECG waveform data whose column number is the sampling points in the preset duration;

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. For example, the ECG waveform data described in the present invention can also be ECG waveform data, blood oxygen waveform data, blood pressure waveform data, etc. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention .

Claims (9)

1. a method that improves EGC waveform data printing effect, is characterized in that, comprises the steps:

Step 1, stores the EGC waveform data of collection into data buffer zone;

Step 2, calculates the sampling number in default duration according to the EGC waveform data sample rate presetting;

Step 3, the efficiently sampling in the default duration of judgement counts whether exceed the default threshold value of counting;

Step 4, if exceed the default threshold value of counting, counts and takes out a processing the efficiently sampling in default duration, takes out after a little finishing dealing with and returns to step 3;

Step 5, if do not exceed the default threshold value of counting, thermal printing head is printed EGC waveform data.

2. a kind of method that improves EGC waveform data printing effect according to claim 1, is characterized in that, before described step 1, also comprises that the EGC waveform data to collecting is carried out pretreated step.

3. a kind of method that improves EGC waveform data printing effect according to claim 1, is characterized in that, after described step 2, also comprises and sets up the step that columns is the EGC waveform data two-dimensional array of the sampling number in default duration.

4. a kind of method that improves EGC waveform data printing effect according to claim 3, it is characterized in that, described step 3 also comprises, two-dimensional array is traveled through by row, judges whether the significant wave graphic data of each row exceedes the step of the default threshold value of counting.

5. a kind of method that improves EGC waveform data printing effect according to claim 4, it is characterized in that, described in described step 4, take out a processing, comprise from row and first open the beginning, carry out pointwise counting until reach the threshold range of counting for significant wave graphic data, remaining Wave data is deleted and is not printed.

6. a kind of method that improves EGC waveform data printing effect according to claim 4, it is characterized in that, described in described step 4, take out a processing, comprise from end of line, carry out pointwise counting until reach the threshold range of counting for significant wave graphic data, remaining Wave data is deleted and is not printed.

7. a kind of method that improves EGC waveform data printing effect according to claim 4, it is characterized in that, described in described step 4, take out a processing, comprise and randomly draw significant wave graphic data until reach the threshold range of counting, remaining Wave data is deleted and is not printed.

8. a device that improves EGC waveform data printing effect, is characterized in that, comprising:

Wave data acquisition module, for gathering EGC waveform data;

Wave data buffer module, is connected with described Wave data acquisition module, for storing the EGC waveform data of collection into data buffer zone;

Sampling number computing module, is connected with described Wave data buffer module, for calculate the sampling number in default duration according to the EGC waveform data sample rate presetting;

The threshold decision of counting module, is connected with described sampling number computing module, for judging the efficiently sampling in default duration counts whether exceed the default threshold value of counting;

Wave data is taken out point module, is connected with the described threshold decision module of counting, and for exceed default counting when threshold value when judgement, the efficiently sampling in default duration is counted and is taken out a processing;

Thermal printing module, is connected with the described threshold decision module of counting, and for do not exceed default counting when threshold value when judgement, thermal printing head is printed EGC waveform data.

9. a kind of device that improves EGC waveform data printing effect according to claim 8, is characterized in that, also comprises:

Wave data pretreatment module, is connected with Wave data buffer module with described Wave data acquisition module, for the EGC waveform data collecting is carried out to pretreatment;

Two-dimensional array is set up module, is connected, for setting up the EGC waveform data two-dimensional array that columns is the sampling number in default duration with described sampling number computing module with the threshold decision module of counting.