A control circuit for an integrated fetal heart rate monitor and fetal heart rate measurement device

Abstract

This invention provides a control circuit for an integrated fetal heart rate monitor and fetal heart rate measurement device, including a power supply, a main control circuit for fetal heart rate monitoring, a signal receiving circuit for fetal heart rate monitoring, a signal command circuit for the monitoring probe, and a fetal heart rate monitoring probe. The power supply is connected to the main control circuit, the signal receiving circuit, and the signal command circuit. The output of the main control circuit is connected to the input of the signal command circuit, and the input of the main control circuit is connected to the output of the signal receiving circuit. The output of the signal command circuit is connected to the fetal heart rate monitoring probe. The fetal heart rate monitoring probe is connected to the input of the signal receiving circuit. The advantages of this invention are: it integrates a fetal heart rate monitor and a fetal heart rate measurement device into one unit, suitable for pregnant women at different stages of pregnancy, including early and late gestational weeks.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, specifically to a control circuit for an integrated fetal heart rate monitor and fetal heart rate measurement device. Background Technology

[0002] Both fetal heart rate monitors and fetal monitors are essential instruments used to detect fetal heart rate during pregnancy. Both utilize ultrasonic Doppler technology. Regarding usage time, fetal heart rate monitors are generally used from week 9 of pregnancy throughout the entire pregnancy, with each handheld session lasting a few minutes. Fetal heart rate monitors are generally used from week 28 of pregnancy until delivery, with each session lasting 20 minutes. If the monitoring results are unsatisfactory, the session may need to be extended to 40 minutes or even longer. During use, a strap should be used to secure the monitor to the abdomen. The ultrasound probes in fetal heart rate monitors and fetal monitors typically employ two operating modes: one is a pulse mode, where the piezoelectric ceramic wafer (chip) works as a transceiver, both emitting and receiving reflected ultrasound echo signals; the other is a continuous mode, where one set of chips continuously emits ultrasonic excitation signals, and another set continuously receives reflected ultrasound echo signals.

[0003] Fetal heart rate monitors and fetal heart rate monitors are used in different scenarios. Although both use the Doppler ultrasound principle, their product forms differ significantly. Fetal heart rate monitors are generally handheld and come in two forms: integrated and separate. Integrated monitors combine the probe and main unit (display and fetal heart rate output) into one unit; separate monitors have the probe and main unit separate, and the user holds the probe against the abdomen to monitor the fetal heart rate. Fetal heart rate monitors, on the other hand, require prolonged monitoring and are usually secured to the abdomen with a strap, and are used simultaneously with a contraction probe to detect the strength of uterine contractions. Due to the different gestational weeks, the operating frequencies of the ultrasound probes in fetal heart rate monitors and fetal heart rate monitors also differ. Fetal heart rate monitors typically operate at 2.5MHz-3MHz with 1-5 chips, while fetal heart rate monitors typically operate at 1MHz-2MHz with 6-16 chips.

[0004] In early pregnancy (e.g., 9 weeks), the fetal heart rate is small and the heartbeat is weak, making it very difficult to locate the heart and requiring considerable patience. Since fetal heart rate monitors are generally used from 9 weeks of pregnancy, and fetal heart rate monitoring devices are generally used from 28 weeks, both are necessary for fetal heart rate monitoring throughout the entire pregnancy. Considering that more and more pregnant women are buying or renting fetal heart rate monitors, it is very inconvenient to hold a fetal heart rate monitor for several minutes to observe the trend of fetal heart rate changes or the STV (Short Time Variability, requiring at least 5 minutes of fetal heart rate data). Furthermore, to reduce the cost of fetal heart rate monitoring (usually fetal heart rate monitors are purchased in early pregnancy; after 28 weeks, renting fetal heart rate monitoring devices is the primary method), combining the two into one device is a user need that needs to be met. Utility Model Content

[0005] To address the problems in existing technologies, this utility model provides a control circuit for an integrated fetal heart rate monitor and fetal heart rate measurement device. By incorporating a power supply, a main control circuit, a signal receiving circuit, a signal command circuit, and a fetal heart rate measurement probe within the uterine contraction probe, the main control circuit can control the fetal heart rate measurement probe to select different frequency bands based on control commands from the control buttons via the signal command circuit. Furthermore, the main control circuit can receive the electrical signals detected by the fetal heart rate measurement probe and convert them into fetal heart rate frequencies via the signal receiving circuit. This integration of a fetal heart rate monitor and a fetal heart rate measurement device makes it suitable for pregnant women at different stages of pregnancy, from early to late gestation. It can be used as a fetal heart rate monitor to detect fetal heart rate, and as a fetal heart rate probe for long-term monitoring. In actual use, the main control circuit board automatically selects the strongest signal channel, eliminating the need for manual selection of the operating frequency. When used as a fetal heart rate monitor, it can use continuous wave mode for good fetal heart sound quality, or pulse wave mode for a wider ultrasound sound field. When used as an ultrasound probe for a fetal heart rate monitor, considering the need for the largest possible sound field range for long-term monitoring, it adopts pulse wave mode. This solves the problem of existing technologies where pregnant women at different stages of pregnancy need to use fetal heart rate monitors and fetal heart rate probes separately.

[0006] This utility model provides a control circuit for an integrated fetal heart rate monitor and fetal heart rate instrument, including a power supply, a main control circuit for fetal heart rate monitoring, a fetal heart rate monitoring signal receiving circuit, a monitoring probe signal command circuit, and a fetal heart rate monitoring probe. The power supply is connected to the main control circuit, the fetal heart rate monitoring signal receiving circuit, and the monitoring probe signal command circuit. The output terminal of the main control circuit is connected to the input terminal of the monitoring probe signal command circuit, and the input terminal is connected to the output terminal of the fetal heart rate monitoring signal receiving circuit. The input terminal of the main control circuit is also connected to a control button. The output terminal of the monitoring probe signal command circuit is connected to the fetal heart rate monitoring probe. The fetal heart rate monitoring probe is connected to the input terminal of the fetal heart rate monitoring signal receiving circuit. The main control circuit can control the fetal heart rate monitoring probe to select different frequency bands according to the control commands of the control button through the monitoring probe signal command circuit, and can receive the electrical signals detected by the fetal heart rate monitoring probe through the fetal heart rate monitoring signal receiving circuit and convert them into fetal heart rate frequency.

[0007] This utility model is further improved in that the fetal heart monitoring main control circuit is provided with a main control chip U1 and a capacitor C49. The main control chip U1 has 20 pins. The 8th pin of the main control chip U1 is connected to one end of the capacitor C49 and the output terminal of the power supply. The 14th pin of the main control chip U1 is connected to the input terminal of the monitoring probe signal command circuit. The 1st and 20th pins of the main control chip U1 are connected to the output terminal of the fetal heart monitoring signal receiving circuit. The other end of the capacitor C49 and the 10th pin of the main control chip U1 are grounded.

[0008] This utility model is further improved. The monitoring probe signal command circuit includes resistors R11, R12, and R13, a field-effect transistor Q5, inductors L12 and L13, a fuse resistor B11, and a capacitor C11. The gate of the field-effect transistor Q5 is connected to one end of resistor R12, and the other end of resistor R12 is connected to pin 14 of the main control chip U1. The drain of the field-effect transistor Q5 is connected to one end of inductor L12 and one end of inductor L13. The other end of inductor L12 is connected to one end of resistor R11, and the other end of resistor R11 is connected to the output terminal of the power supply. The other end of inductor L13 is connected to one end of capacitor C11, and the other end of capacitor C11 is connected to one end of fuse resistor B11. The other end of fuse resistor B11 is connected to the fetal heart monitoring probe control connection. The source of the field-effect transistor Q5 is connected to one end of resistor R13, and the other end of resistor R13 is grounded.

[0009] In a further improvement to this invention, the monitoring probe signal command circuit is further provided with capacitors C12, C13, C14, C15, and C16. One end of capacitor C12 is connected to one end of capacitor C13, one end of capacitor C14, the other end of inductor L12, and one end of resistor R11. One end of capacitor C16 is connected to the drain of field-effect transistor Q5, one end of inductor L12, and one end of inductor L13. One end of capacitor C15 is connected to the other end of capacitor C11 and one end of fuse resistor B11. The other ends of capacitors C12, C13, C14, C15, and C16 are grounded.

[0010] This utility model is further improved by including a resistor R1, a field-effect transistor Q1, an inductor L6, an inductor L7, a transistor Q2, a transistor Q3, an inductor L4, and a capacitor C6 in the fetal heart rate monitoring signal receiving circuit. The gate of the field-effect transistor Q1 is connected to pin 1 of the main control chip U1. The drain of the field-effect transistor Q1 is connected to one end of the inductor L6 and one end of the resistor R1. The other end of the resistor R1 is connected to the output terminal of the power supply. The source of the field-effect transistor Q1 is connected to the other end of the inductor L6 and one end of the inductor L7. The other end of the inductor L7 is connected to the collector of the transistor Q2 and pin 20 of the main control chip U1. The emitter of the transistor Q2 is connected to the collector of the transistor Q3. The base of the transistor Q3 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to one end of the inductor L4. The other end of the inductor L4 is connected to the fetal heart rate monitoring probe.

[0011] This utility model is further improved, and the main control chip U1 is model STCF8F2K08S2.

[0012] Compared with the prior art, the beneficial effects of this utility model are: it provides a control circuit for an integrated fetal heart rate monitor and fetal heart rate instrument. By incorporating a power supply, a main control circuit for fetal heart rate monitoring, a fetal heart rate monitoring signal receiving circuit, a monitoring probe signal command circuit, and a fetal heart rate monitoring probe within the uterine contraction probe, the main control circuit can control the fetal heart rate monitoring probe to select different frequency bands based on control commands from the control buttons via the monitoring probe signal command circuit. Furthermore, it can receive the electrical signals detected by the fetal heart rate monitoring probe and convert them into fetal heart rate frequencies via the fetal heart rate monitoring signal receiving circuit. This allows for the integration of a fetal heart rate monitor and a fetal heart rate instrument into one device, suitable for pregnant women at different stages of pregnancy, from early to late gestation. It can be used as a fetal heart rate monitor to detect fetal heart rate, and as a fetal heart rate probe for long-term monitoring. In actual use, the main control circuit board automatically selects the strongest signal channel, eliminating the need for manual selection of the operating frequency. When used as a fetal heart rate monitor, it can use continuous wave mode for good fetal heart sound quality, or pulse wave mode for a wider ultrasonic sound field. When used as an ultrasonic probe for a fetal heart rate monitor, considering the need for the largest possible sound field range for long-term monitoring, it adopts pulse wave mode. This solves the problem of existing technologies where pregnant women at different stages of pregnancy need to use fetal heart rate monitors and fetal heart rate probes separately. Attached Figure Description

[0013] To more clearly illustrate the solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the control circuit of an integrated fetal heart rate monitor and fetal heart rate measurement device according to the present invention.

[0015] Figure 2 This is a circuit diagram of the main control circuit for fetal heart rate monitoring according to this utility model;

[0016] Figure 3 This is a circuit diagram of the monitoring probe signal command circuit of this utility model;

[0017] Figure 4 This is a circuit diagram of the fetal heart rate monitoring signal receiving circuit of this utility model. Detailed Implementation

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0019] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0021] like Figures 1-4 As shown, the present invention provides a control circuit for an integrated fetal heart rate monitor and fetal heart rate instrument, including a power supply, a fetal heart rate monitoring main control circuit, a fetal heart rate monitoring signal receiving circuit, a monitoring probe signal command circuit, and a fetal heart rate monitoring probe. The power supply is connected to the fetal heart rate monitoring main control circuit, the fetal heart rate monitoring signal receiving circuit, and the monitoring probe signal command circuit. The output terminal of the fetal heart rate monitoring main control circuit is connected to the input terminal of the monitoring probe signal command circuit, and the input terminal of the fetal heart rate monitoring main control circuit is connected to the output terminal of the fetal heart rate monitoring signal receiving circuit. The input terminal of the fetal heart rate monitoring main control circuit is also connected to a control button. The output terminal of the monitoring probe signal command circuit is connected to the fetal heart rate monitoring probe for control, and the fetal heart rate monitoring probe is connected to the input terminal of the fetal heart rate monitoring signal receiving circuit for feedback. In this embodiment, the main control circuit for fetal heart rate monitoring can control the fetal heart rate monitoring probe to select different frequency bands according to the control instructions of the control button through the monitoring probe signal instruction circuit. It can also receive the electrical signals detected by the fetal heart rate monitoring probe through the fetal heart rate monitoring signal receiving circuit and convert them into fetal heart rate frequency. This allows the fetal heart rate monitor and fetal heart rate instrument to be combined into one, which is suitable for pregnant women at different stages of pregnancy, both early and late. It can be used as a fetal heart rate monitor to detect fetal heart rate, and as a fetal heart rate monitoring probe to monitor fetal heart rate for a long time. Moreover, in actual use, the main control circuit board automatically selects the strongest signal channel, without the need for manual selection of the operating frequency.

[0022] like Figure 2 As shown, the fetal heart rate monitoring main control circuit includes a main control chip U1 and a capacitor C49. The main control chip U1 is model STCF8F2K08S2 and has 20 pins. Pin 8 of the main control chip U1 is connected to one end of capacitor C49 and the output terminal of the power supply. Pin 14 of the main control chip U1 is connected to the input terminal of the monitoring probe signal command circuit. Pins 1 and 20 of the main control chip U1 are connected to the output terminal of the fetal heart rate monitoring signal receiving circuit. The other end of capacitor C49 and pin 10 of the main control chip U1 are grounded. In this embodiment, the fetal heart rate monitoring main control circuit is used to control the fetal heart rate monitoring probe to select different frequency bands according to the control commands from the control buttons via the monitoring probe signal command circuit, and can receive the electrical signals detected by the fetal heart rate monitoring probe and convert them into fetal heart rate frequency via the fetal heart rate monitoring signal receiving circuit.

[0023] like Figure 3 As shown, the monitoring probe signal command circuit includes resistors R11, R12, and R13, a field-effect transistor Q5, inductors L12 and L13, a fuse resistor B11, and a capacitor C11. The gate of the field-effect transistor Q5 is connected to one end of resistor R12, and the other end of resistor R12 is connected to pin 14 of the main control chip U1. The drain of the field-effect transistor Q5 is connected to one end of inductors L12 and L13. The other end of inductor L12 is connected to one end of resistor R11, and the other end of resistor R11 is connected to the output terminal of the power supply. The other end of inductor L13 is connected to one end of capacitor C11, and the other end of capacitor C11 is connected to one end of fuse resistor B11. The other end of fuse resistor B11 is connected to the fetal heart rate monitoring probe control... The source of the field-effect transistor Q5 is connected to one end of resistor R13, and the other end of resistor R13 is grounded. The monitoring probe signal command circuit also includes capacitors C12, C13, C14, C15, and C16. One end of capacitor C12 is connected to one end of capacitor C13, one end of capacitor C14, the other end of inductor L12, and one end of resistor R11. One end of capacitor C16 is connected to the drain of the field-effect transistor Q5, one end of inductor L12, and one end of inductor L13. One end of capacitor C15 is connected to the other end of capacitor C11 and one end of fuse resistor B11. The other ends of capacitors C12, C13, C14, C15, and C16 are grounded. In this embodiment, the monitoring probe signal command circuit is used to control the fetal heart rate monitoring probe to select different frequency bands according to the control commands of the fetal heart rate monitoring main control circuit.

[0024] like Figure 4As shown, the fetal heart rate monitoring signal receiving circuit includes a resistor R1, a field-effect transistor Q1, an inductor L6, an inductor L7, a transistor Q2, a transistor Q3, an inductor L4, and a capacitor C6. The gate of the field-effect transistor Q1 is connected to pin 1 of the main control chip U1. The drain of the field-effect transistor Q1 is connected to one end of the inductor L6 and one end of the resistor R1. The other end of the resistor R1 is connected to the output terminal of the power supply. The source of the field-effect transistor Q1 is connected to the other end of the inductor L6 and one end of the inductor L7. The other end of the inductor L7 is connected to the collector of the transistor Q2 and pin 20 of the main control chip U1. The emitter of the transistor Q2 is connected to the collector of the transistor Q3. The base of the transistor Q3 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to one end of the inductor L4. The other end of the inductor L4 is connected to the fetal heart rate monitoring probe. In this embodiment, the fetal heart rate monitoring signal receiving circuit is used to receive the electrical signal detected by the fetal heart rate monitoring probe and feed it back to the fetal heart rate monitoring main control circuit to convert it into fetal heart rate frequency.

[0025] As can be seen from the above, this utility model provides a control circuit for an integrated fetal heart rate monitor and fetal heart rate instrument. By incorporating a power supply, a main control circuit for fetal heart rate monitoring, a fetal heart rate monitoring signal receiving circuit, a monitoring probe signal command circuit, and a fetal heart rate monitoring probe within the uterine contraction probe, the main control circuit can control the fetal heart rate monitoring probe to select different frequency bands based on control commands from the control buttons via the monitoring probe signal command circuit. Furthermore, it can receive the electrical signals detected by the fetal heart rate monitoring probe through the fetal heart rate monitoring signal receiving circuit and convert them into fetal heart rate frequency. This allows for the integration of a fetal heart rate monitor and a fetal heart rate instrument into one device, suitable for pregnant women at different stages of pregnancy, including early and late gestational weeks. It can be used as a fetal heart rate monitor to detect fetal heart rate, and also as a fetal heart rate probe for long-term monitoring. In actual use, the main control circuit board automatically selects the strongest signal channel, eliminating the need for manual selection of the operating frequency. When used as a fetal heart rate monitor, it can use continuous wave mode for good fetal heart sound quality, or pulse wave mode for a wider ultrasound sound field. When used as an ultrasound probe for a fetal heart rate monitor, considering the need for the largest possible sound field range for long-term monitoring, it adopts pulse wave mode. This solves the problem of existing technologies where pregnant women at different stages of pregnancy need to use fetal heart rate monitors and fetal heart rate probes separately.

[0026] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A control circuit for an integrated fetal heart rate monitor and fetal heart rate measurement device, characterized in that: The device includes a power supply, a fetal heart rate monitoring main control circuit, a fetal heart rate monitoring signal receiving circuit, a monitoring probe signal command circuit, and a fetal heart rate monitoring probe. The power supply is connected to the fetal heart rate monitoring main control circuit, the fetal heart rate monitoring signal receiving circuit, and the monitoring probe signal command circuit. The output terminal of the fetal heart rate monitoring main control circuit is connected to the input terminal of the monitoring probe signal command circuit, and the input terminal of the fetal heart rate monitoring main control circuit is connected to the output terminal of the fetal heart rate monitoring signal receiving circuit. The input terminal of the fetal heart rate monitoring main control circuit is also connected to a control button. The output terminal of the monitoring probe signal command circuit is connected to the fetal heart rate monitoring probe for control. The fetal heart rate monitoring probe is connected to the input terminal of the fetal heart rate monitoring signal receiving circuit for feedback. The fetal heart rate monitoring main control circuit can control the fetal heart rate monitoring probe to select different frequency bands according to the control commands of the control button through the monitoring probe signal command circuit, and can receive the electrical signals detected by the fetal heart rate monitoring probe through the fetal heart rate monitoring signal receiving circuit and convert them into fetal heart rate frequency.

2. The control circuit of the fetal heart monitor and fetal heart monitor all-in-one machine according to claim 1, characterized in that: The fetal heart rate monitoring main control circuit includes a main control chip U1 and a capacitor C49. The main control chip U1 has 20 pins. Pin 8 of the main control chip U1 is connected to one end of the capacitor C49 and the output terminal of the power supply. Pin 14 of the main control chip U1 is connected to the input terminal of the monitoring probe signal command circuit. Pins 1 and 20 of the main control chip U1 are connected to the output terminal of the fetal heart rate monitoring signal receiving circuit. The other end of the capacitor C49 and pin 10 of the main control chip U1 are grounded.

3. The control circuit of the tocometer and the integrated machine of the fetal heart monitor according to claim 2, characterized in that: The monitoring probe signal command circuit includes resistors R11, R12, and R13, a field-effect transistor Q5, inductors L12 and L13, a fuse resistor B11, and a capacitor C11. The gate of the field-effect transistor Q5 is connected to one end of resistor R12, and the other end of resistor R12 is connected to pin 14 of the main control chip U1. The drain of the field-effect transistor Q5 is connected to one end of inductor L12 and one end of inductor L13. The other end of inductor L12 is connected to one end of resistor R11, and the other end of resistor R11 is connected to the output terminal of the power supply. The other end of inductor L13 is connected to one end of capacitor C11, and the other end of capacitor C11 is connected to one end of fuse resistor B11, which is connected to the fetal heart rate monitoring probe control. The source of the field-effect transistor Q5 is connected to one end of resistor R13, and the other end of resistor R13 is grounded.

4. The control circuit of the tocometer and the integrated machine of the fetal heart monitor according to claim 3, characterized in that: The monitoring probe signal command circuit also includes capacitors C12, C13, C14, C15, and C16. One end of capacitor C12 is connected to one end of capacitor C13, one end of capacitor C14, the other end of inductor L12, and one end of resistor R11. One end of capacitor C16 is connected to the drain of field-effect transistor Q5, one end of inductor L12, and one end of inductor L13. One end of capacitor C15 is connected to the other end of capacitor C11 and one end of fuse resistor B11. The other ends of capacitors C12, C13, C14, C15, and C16 are grounded.

5. The control circuit of the tocometer and the integrated machine of the fetal heart monitor according to claim 4, characterized in that: The fetal heart rate monitoring signal receiving circuit includes a resistor R1, a field-effect transistor Q1, an inductor L6, an inductor L7, a transistor Q2, a transistor Q3, an inductor L4, and a capacitor C6. The gate of the field-effect transistor Q1 is connected to pin 1 of the main control chip U1. The drain of the field-effect transistor Q1 is connected to one end of the inductor L6 and one end of the resistor R1. The other end of the resistor R1 is connected to the output terminal of the power supply. The source of the field-effect transistor Q1 is connected to the other end of the inductor L6 and one end of the inductor L7. The other end of the inductor L7 is connected to the collector of the transistor Q2 and pin 20 of the main control chip U1. The emitter of the transistor Q2 is connected to the collector of the transistor Q3. The base of the transistor Q3 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to one end of the inductor L4. The other end of the inductor L4 is connected to the fetal heart rate monitoring probe.

6. The control circuit of the tocometer and the integrated machine of the fetal heart monitor according to claim 5, characterized in that: The main control chip U1 is model STCF8F2K08S2.

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