Invasive artery waveform simulator circuit

Abstract

The invention discloses an invasive artery waveform simulator circuit. Although a signal generator in the current market can generate waveforms, the waveforms cannot be directly displayed on a medical monitor, and many problems exist in an invasive arterial blood pressure measurement scene, for example, self-inspection cannot be performed when a new sterile pressure sensor package is not opened, the size is large, the cost is high, and time and labor are wasted. Meanwhile, fault misjudgment is easily caused by water inlet corrosion of a lead wire of an existing arterial pressure sensor. The STC8A8K32S4 single-chip microcomputer is used as a master control operation CPU, a 16-bit DA chip DAC8830 is combined, display of analog waveforms at a monitor end is achieved, and the self-checking problem is solved. Meanwhile, a charging circuit, a warning circuit, an invasive arterial blood pressure value conversion circuit and the like are designed, medical staff can be reminded, continuous operation of the instrument is guaranteed, blood pressure values are accurately converted and displayed, clinical requirements are met, economic cost is reduced, and instrument performance is improved.

Description

Technical Field

[0001] The invention belongs to the field of medical devices, and in particular relates to an invasive arterial waveform simulator circuit. Background Art

[0002] At present, the instruments that can simulate waveforms on the market are mainly signal generators, whose common waveforms include sine waves, triangle waves and square waves, which are often used in the maintenance or development of electronic products. For example, Shengli Instrument Signal Generator and Uni-T Signal Generator have different frequency characteristics and parameters, and the output wires are mostly 2-wire, with dual-channel and multi-channel outputs. However, signal generators have many limitations and cannot meet the needs of medical scenarios.

[0003] When measuring invasive arterial blood pressure in the surgical anesthesia department, there are many consumables and wires to connect, and the instrument cannot perform invasive blood pressure self-test without opening the new sterile pressure sensor package. In addition, although the signal generator can generate waveforms, it cannot directly display on the medical monitor. It is large in size, expensive, and needs to be connected to a power source to work properly.

[0004] At the same time, the existing arterial pressure sensor lead wire has design defects. Some lead ends are too close to each other, which is easy to contact with physiological saline, causing internal water corrosion and short circuit, which makes the connected arterial consumables unable to display waveforms. Clinicians may misjudge it as a consumable problem, resulting in a new set of consumables, which not only triggers unnecessary clinical events, but also increases the economic burden of departments or patients. Summary of the invention

[0005] The purpose of the present invention is to provide an invasive arterial waveform simulator circuit, aiming to solve the problems existing in the above-mentioned background technology. To achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0006] An invasive arterial waveform simulator circuit includes a main control chip and a digital-to-analog chip. The main control chip is connected to the numerical-to-analog chip. The numerical-to-analog chip is used to convert the specific numerical value of invasive arterial blood pressure into an electrical signal and transmit it to the main control chip. The main control chip converts the electrical signal transmitted by the numerical-to-analog chip into a specific numerical value and displays it on a display screen. The main control chip is provided with a plurality of PW_CD pins for connecting external wires to a monitor. The main control chip is electrically connected to an alarm circuit, and the alarm circuit is used to remind medical staff. The main control chip is electrically connected to a charging circuit. The numerical-analog chip is electrically connected to an invasive arterial blood pressure numerical conversion circuit. The invasive arterial blood pressure numerical conversion circuit converts the specific numerical value of the patient's invasive arterial blood pressure into an electrical signal and then into a numerical value through the numerical-analog chip and displays it on an invasive arterial waveform simulator or a monitor.

[0007] Preferably, the main control chip is a STC8A8K32S4 single chip microcomputer.

[0008] Preferably, the digital-to-analog chip is a DAC8830 chip.

[0009] Preferably, the charging circuit includes capacitors C1, C8, and C9. One end of capacitors C1, C8, and C9 is connected to VCC, and the other end is connected to the ground wire.

[0010] Preferably, the warning circuit includes light-emitting diodes LEDD5, LEDD6, resistors R19, and R20. One end of resistor R19 and resistor R20 is respectively connected to pin 1 and pin 23 of the main control chip. The other end of resistor R19 and resistor R20 is respectively connected to light-emitting diode LEDD5 and light-emitting diode LEDD6. After being connected, light-emitting diode LEDD5 and light-emitting diode LEDD6 are connected to the ground wire.

[0011] Preferably, the invasive arterial blood pressure numerical conversion circuit includes port J2, capacitors C3, C4, resistors R4, R5, R9, R10, R11, and chip DA28830. Pin 1 and pin 4 of port J2 are respectively connected to pin VDD and pin DGND of chip DA28830. A capacitor C3 is provided between pin VDD and pin DGND of chip DA28830. One end of capacitor C4 is connected to pin VREF of chip DA28830, and the other end is connected to the ground wire. One end of resistor R10 is connected to VCC, the other end of resistor R10 is connected to R9. One end of resistor R11 is connected to the ground wire, the other end of resistor R11 is connected to resistor R9. The other end of resistor R9 is connected to POA, the other end of POA is connected to resistor R4, the other end of resistor R4 is connected to POB, the other end of POB is connected to resistor R5, and the other end of the resistor is connected to pin VOUT of chip DA28830.

[0012] Preferably, a blood pressure conversion electrical signal circuit is provided between POA and POA.

[0013] Preferably, the blood pressure conversion electrical signal circuit includes resistors, VCC, POA, POB, and RES1. It is connected to VCC. The other ends of POA and POB are connected to RES1. POA and POB are not connected to each other. Resistors are provided between VCC, POA, POB, and RES1 in pairs. The voltage of the resistor between POA and POB and RES1 is a fixed voltage, and the voltage of the resistor between POA and POB and VCC is a variable voltage. When the resistor between VCC and POA increases, the resistor between VCC and POB decreases, and vice versa.

[0014] Advantages of the present invention:

[0015] Realize the self-test function: Use STC8A8K32S4 MCU as the main control CPU, with 16-bit DA chip DAC8830, to realize the display of analog waveform on the monitor end, solve the problem of unable to self-test when the new sterile pressure sensor package is not opened, help medical staff quickly determine whether there is a fault in the monitor, monitor wire or arterial sensor, reduce the waste of consumables caused by misjudgment, and reduce the economic cost of departments and patients.

[0016] Adaptable to medical monitors: It breaks through the technical bottleneck that the signal generator cannot directly allow the medical monitor to display the waveform, so that the simulated invasive arterial waveform can be intuitively presented on the monitor, meeting the actual needs of clinical monitoring and providing an effective tool for doctors to accurately judge the patient's condition.

[0017] Optimized circuit design: The functionality and practicality of the instrument are enhanced by designing charging circuits, warning circuits, and invasive arterial blood pressure value conversion circuits. For example, the warning circuit can remind medical staff of the working status of the instrument, the charging circuit ensures the continuous operation of the instrument, and the invasive arterial blood pressure value conversion circuit can accurately convert and display the patient's invasive arterial blood pressure value, thus improving the overall performance of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall circuit schematic diagram provided for the embodiment of the present invention;

[0019] Figure 2 A pin diagram provided for an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of a charging circuit provided by an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of a warning circuit according to an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of an invasive arterial blood pressure value conversion circuit according to an embodiment of the present invention;

[0023] Figure 6 FIG. 4 is a schematic diagram of a blood pressure conversion electrical signal circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. The terms "upper end", "lower end", "left side", "right side", "front end", "rear end" and similar expressions used herein are positional relationships with reference to the accompanying drawings.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0028] like Figures 1 to 4 As shown, an embodiment of the present invention provides an invasive arterial waveform simulator circuit, a main control chip and a digital-to-analog chip, the main control chip is connected to the numerical-to-analog chip, the numerical-to-analog chip is used to convert the specific numerical value of the invasive arterial blood pressure into an electrical signal and transmit it to the main control chip, the main control chip converts the electrical signal transmitted by the numerical-to-analog chip into a specific numerical value and displays it on a display screen, the main control chip is provided with a plurality of PW_CD pins for connecting external wires to a monitor, the main control chip is electrically connected to an alarm circuit, the alarm circuit is used to remind medical staff, the main control chip is electrically connected to a charging circuit, the numerical simulation chip is electrically connected to an invasive arterial blood pressure numerical conversion circuit, the invasive arterial blood pressure numerical conversion circuit converts the specific numerical value of the patient's invasive arterial blood pressure into an electrical signal and then into a numerical value through the numerical simulation chip and displays it in an invasive arterial waveform simulator or a monitor.

[0029] In the embodiment, the main control chip is a STC8A8K32S4 single chip microcomputer.

[0030] In the embodiment, the digital-to-analog chip is a DAC8830 chip.

[0031] In the embodiment, the charging circuit includes capacitors C1, C8 and C9, one end of the capacitors C1, C8 and C9 is connected to VCC, and the other end of the capacitors C1, C8 and C9 is connected to the ground line.

[0032] In the embodiment, the warning circuit includes light-emitting diodes LEDD5, LEDD6, resistors R19 and R20, one end of the resistor R19 and the resistor R20 are respectively connected to pin 1 and pin 23 of the main control chip, the other end of the resistor R19 and the resistor R20 are respectively connected to the light-emitting diode LEDD5 and the light-emitting diode LEDD6, and the light-emitting diode LEDD5 and the light-emitting diode LEDD6 are connected to the ground wire.

[0033] In the embodiment, the invasive arterial blood pressure numerical conversion circuit includes a port J2, capacitors C3, C4, resistors R4, R5, R9, R10, R11 and a chip DA28830. Pin 1 and pin 4 of the port J2 are respectively connected to the VDD pin and the DGND pin of the chip DA28830. A capacitor C3 is arranged between the VDD pin and the DGND pin of the chip DA28830. One end of the capacitor C4 is connected to the VREF pin of the chip DA28830, and the other end of the capacitor C4 is connected to the ground line. One end of the resistor R10 is connected to VCC, and the other end of the resistor R10 is connected to R9. One end of the resistor R11 is connected to the ground line, and the other end of the resistor R11 is connected to the resistor R9. The other end of the resistor R9 is connected to POA, and the other end of POA is connected to the resistor R4. The other end of the resistor R4 is connected to POB, and the other end of POB is connected to the resistor R5. The other end of the resistor is connected to the VOUT pin of the chip DA28830.

[0034] In the embodiment, a blood pressure conversion electrical signal circuit is provided between the POAs.

[0035] In the embodiment, the blood pressure conversion electrical signal circuit includes a resistor, VCC, POA, POB and RES1, which is connected to VCC. The other ends RES1 of POA and POB are connected, and POA and POB are not connected. Resistors are arranged between VCC, POA, POB and RES1. The voltage of the resistor between POA and POB and RES1 is a fixed voltage, and the voltage of the resistor between POA and POB and VCC is a variable voltage. When the resistor between VCC and POA increases, the resistor between VCC and POB decreases, and vice versa.

[0036] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. An invasive arterial waveform simulator circuit, characterized in that: A main control chip and a digital-to-analog chip, wherein the main control chip is connected to the numerical-to-analog chip, the numerical-to-analog chip is used to convert the specific numerical value of the invasive arterial blood pressure into an electrical signal and transmit it to the main control chip, the main control chip converts the electrical signal transmitted by the numerical-to-analog chip into a specific numerical value and displays it on a display screen, the main control chip is provided with a plurality of PW_CD pins for connecting external wires to a monitor, the main control chip is electrically connected to an alarm circuit, the alarm circuit is used to remind medical staff, the main control chip is electrically connected to a charging circuit, the numerical analog chip is electrically connected to an invasive arterial blood pressure numerical conversion circuit, the invasive arterial blood pressure numerical conversion circuit converts the specific numerical value of the patient's invasive arterial blood pressure into an electrical signal and then into a numerical value through the numerical analog chip and displays it in an invasive arterial waveform simulator or monitor.

2. The invasive arterial waveform simulator circuit according to claim 1, characterized in that: The main control chip is a STC8A8K32S4 single chip microcomputer.

3. The invasive arterial waveform simulator circuit according to claim 2, characterized in that: The digital-to-analog chip is a DAC8830 chip.

4. The invasive arterial waveform simulator circuit according to claim 3, characterized in that: The charging circuit includes capacitors C1, C8 and C9, one end of the capacitors C1, C8 and C9 is connected to VCC, and the other end of the capacitors C1, C8 and C9 is connected to the ground line.

5. The invasive arterial waveform simulator circuit according to claim 4, characterized in that: The warning circuit includes light-emitting diodes LEDD5, LEDD6, resistors R19 and R20, one end of the resistor R19 and the resistor R20 are respectively connected to pin 1 and pin 23 of the main control chip, the other end of the resistor R19 and the resistor R20 are respectively connected to the light-emitting diode LEDD5 and the light-emitting diode LEDD6, and the light-emitting diode LEDD5 and the light-emitting diode LEDD6 are connected to the ground wire.

6. The invasive arterial waveform simulator circuit according to claim 5, characterized in that: The invasive arterial blood pressure numerical conversion circuit comprises a port J2, capacitors C3 and C4, resistors R4, R5, R9, R10 and R11 and a chip DA28830, wherein pins 1 and 4 of the port J2 are respectively connected to pins VDD and DGND of the chip DA28830, the capacitor C3 is arranged between pins VDD and DGND of the chip DA28830, one end of the capacitor C4 is connected to pin VREF of the chip DA28830, and the other end of the capacitor C4 is connected to the ground line. One end of the resistor R10 is connected to VCC, the other end of the resistor R10 is connected to R9, one end of the resistor R11 is connected to the ground line, the other end of the resistor R11 is connected to the resistor R9, the other end of the resistor R9 is connected to POA, the other end of POA is connected to the resistor R4, the other end of the resistor R4 is connected to POB, the other end of POB is connected to the resistor R5, and the other end of the resistor is connected to the VOUT pin of the chip DA28830.

7. An invasive arterial waveform simulator circuit according to claim 5 or 6, characterized in that: A blood pressure conversion electrical signal circuit is provided between the POA and the POA.

8. The invasive arterial waveform simulator circuit according to claim 7, characterized in that: The blood pressure conversion electrical signal circuit includes a resistor, VCC, POA, POB and RES1, which is connected to the VCC. The other ends of the POA and POB are connected to the RES1, and the POA is not connected to the POB. Resistors are arranged between the VCC, POA, POB and RES1. The voltage of the resistor between the POA and POB and RES1 is a fixed voltage, and the voltage of the resistor between the POA and POB and the VCC is a variable voltage. When the resistor between the VCC and the POA increases, the resistor between the VCC and the POB decreases, and vice versa.

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