CN210871694U - Fetal monitoring device - Google Patents
Fetal monitoring device Download PDFInfo
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- CN210871694U CN210871694U CN201822006647.1U CN201822006647U CN210871694U CN 210871694 U CN210871694 U CN 210871694U CN 201822006647 U CN201822006647 U CN 201822006647U CN 210871694 U CN210871694 U CN 210871694U
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Abstract
The utility model relates to a fetal monitoring device, which comprises a receiving unit, a receiving unit and a control unit, wherein the receiving unit is configured to obtain a sample signal segment of an ultrasonic signal acquired from a fetus; a comparison unit configured to compare a magnitude of a sample signal in the sample signal segment with a predetermined first threshold and a second threshold, the first threshold being greater than the second threshold; wherein the fetal monitoring device further comprises a signal processing unit configured to keep the sample signal in the sample signal segment unchanged when the magnitude is greater than the first threshold or less than the second threshold; and amplifying the sample signal in the sample signal segment when the magnitude is between the first threshold and the second threshold. Thereby, different ultrasound signal samples can be processed differently, such that a relatively strong ultrasound signal representing a fetal heartbeat is not saturated by the amplification while a relatively weak ultrasound signal representing a fetal heartbeat is amplified.
Description
Technical Field
The utility model relates to a medical science guardianship field especially relates to the guardianship of going on the foetus.
Background
Fetal heart monitoring is one of the monitoring methods commonly used in obstetrics and gynecology. Usually, when starting fetal heart monitoring, a doctor places the ultrasound probe at different positions of the abdomen of the pregnant woman, and the fetal heart monitoring apparatus is able to generate sound signals from the ultrasound signals collected from the fetus at the respective positions, which are played to the doctor through the loudspeaker, the intensity of which is related to the distance between the ultrasound probe and the heart of the fetus at the current position. The physician determines from the strength of the heard sound signal whether the current position better corresponds to the heart of the fetus. If it is determined that the current position corresponds to the heart of the fetus, the positioning of the ultrasound probe is complete and the heartbeat of the fetus can continue to be monitored at that position.
In the above positioning process, the doctor wants to be able to clearly hear the sound signal representing the fetal heartbeat, especially in the case that the ultrasonic probe is relatively far away from the fetal heart and thus the sound signal is relatively weak, which is beneficial for the doctor to position the ultrasonic probe according to the sound signal and know the current fetal heartbeat.
Generally, the intensity of the sound signal can be increased by performing amplification processing based on one amplification constant on all the ultrasonic signals, but this may cause some ultrasonic signals to be saturated and make it difficult to obtain a satisfactory sound signal.
SUMMERY OF THE UTILITY MODEL
It would be desirable to provide a fetal monitoring device that is capable of differently processing different samples of ultrasound signals so that the relatively strong ultrasound signals representing the fetal heartbeat are not saturated by amplification while the relatively weak ultrasound signals representing the fetal heartbeat are amplified.
According to an embodiment of the present invention, there is provided a fetal monitoring device, comprising a receiving unit configured to obtain one sample signal segment of an ultrasound signal acquired from a fetus; a comparison unit configured to compare a magnitude of a sample signal in the sample signal segment with a predetermined first threshold and a second threshold, the first threshold being greater than the second threshold; wherein the fetal monitoring device further comprises a signal processing unit configured to keep the sample signal in the sample signal segment unchanged when the magnitude is greater than the first threshold or less than the second threshold; and amplifying the sample signal in the sample signal segment when the magnitude is between the first threshold and the second threshold.
According to the fetal monitoring device of the embodiments of the present invention, the ultrasound sample signal is compared with the first threshold and the second threshold, only the sample signal with the magnitude between the first threshold and the second threshold is amplified, and those sample signals with the magnitude larger than the first threshold or smaller than the second threshold are not amplified, thereby avoiding amplifying the background noise, and the relatively weak ultrasound signal representing the fetal heartbeat is amplified while the relatively strong ultrasound signal is not saturated due to the amplification.
According to a further embodiment, the signal processing unit further comprises an amplification factor determination unit configured to determine an amplification factor for the sample signal inversely related to the magnitude when the magnitude is between the first threshold and the second threshold; and a signal amplification unit configured to amplify the sample signal in the sample signal segment based on the amplification factor.
When the sample signals representing the fetal heartbeat are amplified, the amplification factors are determined in a manner of being inversely related to the magnitude of the sample signals, so that the small amplification factors can be set for the sample signals with large magnitude, the large amplification factors can be set for the sample signals with small magnitude, weak signals can be amplified based on the large amplification factors, and strong signals can be amplified based on the small amplification factors, and therefore, originally weak heart sound signals can be clearer, and relatively strong heart sound signals cannot be saturated.
According to a further embodiment, the comparison unit is further configured to determine a maximum value of the amplitude of each sample signal in the sample signal segment as the magnitude of the sample signal in the sample signal segment.
In this way, the amplification factor for the entire sample signal segment can be determined based on the sample signal with the largest amplitude, i.e. the amplification factor is constant for all sample signals in each sample signal segment, thereby reducing the computational complexity, reducing the delay caused by processing the sample signals, and easily maintaining the strength relationship between the individual sample signals in the sample signal segment, i.e. after amplification, a relatively weak signal is still relatively weak, while a relatively strong signal is still relatively strong.
According to a further embodiment, the amplification factor determination unit determines the amplification factor based on the following formula:
V＝(A-T2)/(T1-T2)*(T1-g*T2)+g*T2
K＝V/A
wherein A represents the maximum value, T1 represents the first threshold value, T2 represents the second threshold value, g represents a gain factor, and K represents the amplification factor.
According to a further embodiment, the gain factor represents a value between 1 and T1/T2.
According to the above-described embodiments, a specific implementation for determining the amplification factor is provided, which can ensure that the sample signals are amplified in inverse correlation with their magnitudes, while maintaining the magnitude-relative relationship of the sample signals.
According to a further embodiment, the signal processing unit is further configured to keep the relation between the individual sample signals unchanged when amplifying the sample signals in the sample signal section.
Since the intensity of each sample signal is inversely proportional to the distance between the ultrasound probe and the fetal heart, the distance between the ultrasound probe and the fetal heart is small when the intensity of the sample signal is high. In performing the amplification of the sample signals, it would be beneficial to maintain the relationship between the individual sample signals, in particular the relative relationship of the magnitude, for positioning the ultrasound probe by the fetal heart sound signal.
According to a still further embodiment, the amplification factor determination unit is further configured to adjust the amplification factor determined for the current sample signal segment based on the amplification factor determined for an adjacent sample signal segment preceding the current sample signal segment.
In this way, the amplification factor of the current sample signal segment can be adjusted based on the amplification factor determined for the previous sample signal segment, thereby ensuring that when adjacent sample signal segments are amplified, no sharp change in the amplification factor occurs between the sample signal segments.
According to a still further embodiment, the signal processing unit further comprises an interpolation unit configured to interpolate a predetermined number of adjacent amplified sample signals in the current sample signal segment and the adjacent sample signal segment. This can avoid sharp amplitude variations after amplification between adjacent sample signals between adjacent sample signal segments, making the sample signals smoother.
According to a still further embodiment, the fetal monitoring device further comprises a user interface configured to receive a control signal from a user; wherein the signal processing unit is further configured to process the sample signal segment based on the control signal. This enables the user to enable or disable the signal processing function according to the invention.
Drawings
Fig. 1 shows a block diagram of a fetal monitoring device according to an embodiment of the present invention;
fig. 2 shows a block diagram of a fetal monitoring device according to another embodiment of the present invention;
fig. 3 shows a schematic diagram of an ultrasound signal before processing, an ultrasound signal after processing, an amplitude before processing, an amplitude after processing, and a gain factor using a fetal monitoring device according to an embodiment of the present invention.
Various aspects and features of the present invention are described with reference to the above-identified figures. The drawings described above are only schematic and are non-limiting. The size, shape, reference numerals, or appearance of the respective elements in the above-described drawings may be changed without departing from the gist of the present invention, and are not limited to only those shown in the drawings of the specification.
Detailed Description
Fig. 1 shows a block diagram of a fetal monitoring device 10 according to an embodiment of the present invention. The fetal monitoring device 10 comprises a receiving unit 11, a comparing unit 12 and a signal processing unit 13. The receiving unit 11 obtains one sample signal segment of the ultrasound signal acquired by the ultrasound transducer (not shown). The sample signal segment can comprise a predetermined number or a predetermined length of time of sample signals, which may be one or more sample signals. The number of sample signals contained in the sample signal segment can be determined by multiplying the predetermined time length by the sampling rate of the ultrasound signal, whereas the time length of the sample signal segment can also be determined from the number of sample signals and the sampling rate of the ultrasound signal. The sample signal segment can be obtained and stored in a buffer for further processing.
In one embodiment, the size of the sample signal segment, i.e. the predetermined number or the predetermined length of time, can be selected such that the processing of the ultrasound signal in the sample signal segment is near real-time. This ensures that the processed ultrasound signal can also reflect the real-time localization between the ultrasound probe and the fetal heart, facilitating the localization of the ultrasound probe by the physician according to the processed ultrasound signal.
The comparison unit 12 is capable of determining a magnitude of the sample signal in the obtained ultrasound sample signal segment and comparing the determined magnitude of the sample signal with a predetermined first threshold value and a second threshold value, the first threshold value being larger than the second threshold value. It is contemplated that the magnitude is any value capable of representing the energy of the sample signal, including but not limited to amplitude. In one embodiment, the first threshold is an expected maximum value of the ultrasound sample signal representing the fetal heartbeat. The first threshold can also be determined by the user from an expected maximum value of the ultrasound sample signal representing the fetal heartbeat and/or the magnitude of the saturated ultrasound sample signal. In one embodiment, the second threshold is determined from an expected minimum of the ultrasound sample signal representing the fetal heartbeat.
The signal processing unit 13 processes the sample signal segments based on the comparison result from the comparing unit 12. Specifically, when the magnitude of the sample signal in the sample signal segment is greater than a first threshold value or less than a second threshold value, the sample signal in the sample signal segment is kept unchanged; and amplifying the sample signal in the sample signal segment when the magnitude is between the first threshold and the second threshold. Thus, only sample signals having a magnitude, in particular an amplitude, between a first threshold and a second threshold are amplified without any processing of sample signals having a magnitude above the first threshold or below the second threshold, thus avoiding amplification of background noise signals, enabling amplification of weaker signals representing the fetal heartbeat, without saturating some of the sample signals.
In a preferred embodiment, the signal processing unit 13 keeps the relationship, in particular the magnitude relative relationship, between the individual sample signals unchanged when amplifying the individual sample signals in a sample signal segment. For example, a sample signal having a relatively large magnitude is still relatively large in magnitude after amplification, and a sample signal having a relatively small magnitude is still relatively small in magnitude after amplification. This facilitates the localization of the ultrasound probe from the processed ultrasound signals.
In one embodiment, the signal processing unit 13 specifically includes an amplification factor determination unit 131 and a signal amplification unit 131. Fig. 2 shows a block diagram of a fetal monitoring device according to this embodiment. When the signal processing unit 13 determines that the amplification processing of the sample signal in the sample signal segment is required based on the comparison result, the two units are used in common to perform amplification of the sample signal.
The amplification factor determination unit 131 is configured to determine the amplification factor for the sample signal in a negative correlation with the magnitude of the sample signal when the magnitude of the sample signal in the sample signal segment is between a first threshold and a second threshold, i.e. the determined magnitude of the amplification factor is in a negative correlation with the magnitude of the sample signal, the amplification factor being smaller when the magnitude of the sample signal is large; and when the magnitude of the sample signal is small, the amplification factor is large. The signal amplification unit 132 is configured to amplify the respective sample signal in the sample signal segment based on the amplification factor. Typically, the sample signal segment comprises a plurality of sample signals. In one embodiment, an amplification factor that is inversely related to its magnitude can be determined for each sample signal. In this case, the amplification factor for the sample signal segment may be a vector comprising a plurality of amplification factor samples.
By determining the amplification factor in a manner of inversely correlating with the magnitude of the sample signal, it can be ensured that a smaller amplification factor is set for a sample signal having a larger magnitude, and a larger amplification factor is set for a sample signal having a smaller magnitude, so that a weak signal can be amplified based on the larger amplification factor, and a strong signal can be amplified based on the smaller amplification factor, and thus, an originally weak heart sound signal can be made clearer, and a relatively strong heart sound signal can not be saturated.
In a further embodiment, the comparison unit 12 determines the maximum value of the amplitude of each sample signal in the obtained sample signal segment as the magnitude of the sample signal in the sample signal segment. In this embodiment, the first threshold and the second threshold can be thresholds related to the magnitude of the sample signal.
When the comparing unit 12 determines the maximum value of the amplitude of each sample signal in the obtained sample signal segment as the magnitude of the sample signal in the sample signal segment, the amplification factor determining unit 131 can determine the amplification factor in negative correlation with the maximum value, that is, the amplification factor can be in negative correlation with the maximum value, and the signal amplifying unit 132 can amplify all the sample signals in the obtained sample signal segment based on the amplification factor determined for the maximum value. In this way, the same amplification factor can be used for all sample signals in a sample signal segment, which not only simplifies the calculation, but also maintains the relationship, especially the amplitude relative relationship, between the sample signals in the sample signal segment. That is, the relatively large sample signal is still relatively large after amplification, and the relatively small sample signal is still relatively small after amplification, so that the user can conveniently perform probe positioning according to the ultrasonic signal.
In a specific embodiment, the amplification factor determination unit 131 determines the amplification factor based on the following formula:
V＝(A-T2)/(T1-T2)*(T1-g*T2)+g*T2
K＝V/A
where a denotes a maximum value of the amplitude of each sample signal in the sample signal segment, T1 denotes the first threshold, T2 denotes the second threshold, g denotes a gain factor, and K denotes the amplification factor. After the above-mentioned amplification factor K has been determined, all sample signals in the sample signal segment can be amplified on the basis of this amplification factor.
In the above formula, the gain factor g is adjustable, being any value between 1 and T1/T2, although it is of course also possible to have g take one value for each sample signal segment, or a fixed value for all sample signal segments. Fig. 3 shows a schematic diagram of an ultrasound signal before processing, an ultrasound signal after processing, an amplitude before processing, an amplitude after processing and a gain factor possibly used with a fetal monitoring device according to an embodiment of the invention.
Although the use of the above formula to determine the amplification factor has been described with reference to the maximum value of the sample signal amplitude in the sample signal segment, it is contemplated that this is not limiting. A in the above formula may also represent the amplitude of one of the sample signals in one sample signal segment. In this case, the above formula can be used to determine the amplification factor for each sample signal in the sample signal segment, resulting in an amplification factor represented in vector form. In this case, the relative magnitude relationship between the sample signals can be guaranteed to be constant by adjusting the gain factor.
In a preferred embodiment, after determining the amplification factor for the current sample signal segment, the amplification factor determination unit 131 is further capable of adjusting the amplification factor determined for the current sample signal segment based on the amplification factor determined for the neighboring sample signal segment before the current sample signal segment.
For example, the amplification factor determination unit 131 can store the amplification factor of each sample signal segment after determining the amplification factor; after the amplification factor is determined for the current sample signal segment, the amplification factor of an adjacent sample signal segment before the current sample signal segment can be extracted; and judging whether the amplification factor of the current sample signal segment is out of a predetermined range compared with the amplification factor of the adjacent sample signal segment, for example, whether the amplification factor of the current sample signal segment is out of 0.75 times and 1.5 times of the amplification factor of the adjacent sample signal segment, namely, whether the amplification factor of the current sample signal segment is less than 0.75 times of the amplification factor of the adjacent sample signal segment or more than 1.5 times of the amplification factor of the adjacent sample signal segment, and if so, correspondingly adjusting the amplification factor of the current sample signal segment to be 0.75 times or 1.5 times of the amplification factor of the adjacent sample signal segment. Such an adjustment can avoid sharp variations in amplification factor between adjacent sample signal segments. It is contemplated that other multiples are possible and can be set by the user as desired and/or practical.
In a further preferred embodiment, as shown in fig. 2, the signal processing unit 13 further comprises an interpolation unit 133 configured to interpolate a predetermined number of adjacent amplified sample signals in the current sample signal segment and the adjacent sample signal segment. This can avoid sharp amplitude variations after amplification after adjacent sample signals between different sample signal segments, smoothing the variations of the sample signals.
After the above-mentioned processing of the ultrasound sample signals, the processed ultrasound sample signals can be sent to the audio driver to drive the speaker to play a sound signal of a corresponding volume based on the sample signals, so that the user can monitor the heartbeat of the fetus and/or position the ultrasound probe according to the sound signal.
Furthermore, the fetal monitoring device may further comprise a user interface capable of receiving a control signal from a user, based on which the signal processing unit 13 is capable of determining whether to perform the processing of the sample signal segments. In this way, the user can enable or disable the processing of various embodiments of the present invention by inputting control signals.
While various embodiments of the present invention have been described above with reference to fetal monitoring device 10, it is contemplated that one or more of the elements thereof can be deleted/merged/split/modified to delete/alter and/or modify the corresponding functionality. Various embodiments can be combined, or individual features of different embodiments can be combined into other embodiments to achieve a better result.
While aspects of the present invention have been described with reference to the details shown in fig. 1-3, it will be apparent to those skilled in the art that the present invention is not limited to the details shown in fig. 1-3. Any of the components of the fetal monitoring device of the present invention can be implemented in any form in the prior art without departing from the spirit and essential characteristics of the present invention. In addition, the specific embodiments are to be considered in all respects as illustrative and not restrictive. The word "comprising" in the description and in the claims does not exclude the presence of other elements or steps. The functions of the respective elements described in the specification or recited in the claims may be divided or combined into plural corresponding elements or may be implemented by a single element.
Claims (8)
1. A fetal monitoring device comprising
A receiving unit configured to obtain one sample signal segment of an ultrasound signal acquired from a fetus;
a comparison unit configured to compare the amplitude of the sample signal in the sample signal segment with a predetermined first threshold and a second threshold, the first threshold being greater than the second threshold;
characterized in that the fetal monitoring device further comprises
A signal processing unit configured to keep a sample signal in the sample signal segment unchanged when the amplitude is greater than the first threshold or less than the second threshold; and amplifying a sample signal in the sample signal segment when the amplitude is between the first threshold and the second threshold;
an audio driver configured to receive the sample signal segment processed by the signal processing unit to drive the speaker to play a sound signal of a corresponding volume based on the processed sample signal segment; and
the speaker configured to play the sound signal of the corresponding volume,
wherein the signal processing unit comprises
An amplification factor determination unit configured to determine an amplification factor for the sample signal in negative correlation with the amplitude when the amplitude is between the first threshold and the second threshold; and
a signal amplification unit configured to amplify the sample signal in the sample signal segment based on the amplification factor.
2. The fetal monitoring device of claim 1, wherein the comparison unit is further configured to determine a maximum of the amplitudes of the sample signals in the sample signal segment as the amplitude of the sample signal in the sample signal segment.
3. The fetal monitoring device of claim 2, wherein the amplification factor determination unit determines the amplification factor based on the formula:
V＝(A-T2)/(T1-T2)*(T1-g*T2)+g*T2
K＝V/A
wherein A represents the maximum value, T1 represents the first threshold value, T2 represents the second threshold value, g represents a gain factor, and K represents the amplification factor.
4. The fetal monitoring device of claim 3, wherein the gain factor represents a value between 1 and T1/T2.
5. The fetal monitoring device of any one of claims 1-4, wherein the signal processing unit is further configured to keep the relationship between the sample signals unchanged when amplifying the sample signals in the sample signal segment.
6. The fetal monitoring device of any one of claims 1-4, wherein the amplification factor determination unit is further configured to adjust the amplification factor determined for a current sample signal segment based on the amplification factor determined for an adjacent sample signal segment preceding the current sample signal segment.
7. The fetal monitoring device of claim 6,
the signal processing unit further includes an interpolation unit configured to interpolate a predetermined number of adjacent amplified sample signals in the current sample signal segment and the adjacent sample signal segment.
8. The fetal monitoring device of any one of claims 1-4, wherein the fetal monitoring device further comprises
A user interface configured to receive a control signal from a user;
wherein the signal processing unit is further configured to process the sample signal segment based on the control signal.
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| CN201822006647.1U CN210871694U (en) | 2018-11-30 | 2018-11-30 | Fetal monitoring device |
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| CN201822006647.1U CN210871694U (en) | 2018-11-30 | 2018-11-30 | Fetal monitoring device |
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| CN210871694U true CN210871694U (en) | 2020-06-30 |
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| CN201822006647.1U Active CN210871694U (en) | 2018-11-30 | 2018-11-30 | Fetal monitoring device |
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