A power amplifier circuit for a bubble sensor in a high pressure syringe

Abstract

The utility model discloses a kind of power amplification circuit for bubble sensor in high-pressure injector, it is related to the functional circuit of medical instrument, the present scheme is proposed to the single function of bubble sensor in prior art.The light transmitted through infusion tube is obtained by using photosensitive diode and converted into electrical signal;After first transistor carries out first-stage amplification, then it is output to host computer after synchronous amplification coupling using second transistor and third transistor.It is characterized in that, the only optical device in high-pressure injector can be used as much as possible, the original binary light signal is changed into continuous change analog signal, and finally the maximum information capacity is provided to host computer as reference information for subsequent work.

Description

Technical Field

[0001] This utility model relates to the functional circuits of medical devices, and more particularly to a power amplifier circuit for a bubble sensor in a high-pressure injector. Background Technology

[0002] In the injection tubing of a high-pressure injector, a bubble sensor is installed at the high-pressure output end to detect air bubbles. The bubble sensor captures the transmitted light after it shines light into the tubing, performs binarization processing, and finally uploads the data to the host computer. The host computer analyzes the 1 / 0 signals received from the bubble sensor to determine the presence and size of air bubbles in the tubing. For example, a 1 indicates strong light transmission and the presence of air bubbles, while a 0 indicates weak light transmission and the absence of air bubbles. The system can also analyze the duration of the 1 signal to determine the length of the air bubbles.

[0003] High-pressure injectors are increasingly pursuing miniaturization, resulting in less and less design space on the main unit board. The entire tubing system typically only contains one optical component: a bubble sensor. However, the information that can be obtained from the infusion tubing using optical signals often includes more than just bubbles; for example, determining the concentration and type of the injected medication. Using only binary representation to detect bubbles would be a waste of circuitry.

[0004] Although information such as the concentration and type of drug in the infusion tube is related to light transmittance, it cannot be represented by simple binarization. Therefore, a power amplifier circuit that can reasonably amplify the light signal and send it to the host is needed to cooperate with functional monitoring. Utility Model Content

[0005] The purpose of this invention is to provide a power amplifier circuit for a bubble sensor in a high-pressure injector, so as to solve the problems existing in the prior art.

[0006] The power amplifier circuit for a bubble sensor in a high-pressure injector described in this utility model has the following structure:

[0007] The anode of the photodiode is connected to Vcc through a first resistor; the cathode of the photodiode is grounded through a second resistor and a first capacitor, respectively; the photodiode is used to acquire light transmitted through the infusion tube and convert it into an electrical signal.

[0008] The gate of the first transistor is connected to the cathode of the photodiode through a third resistor, the source of the first transistor is grounded, and the drain of the first transistor is connected to the first common point through a fourth resistor.

[0009] The first bias voltage is connected to the first common point through the sixth resistor;

[0010] The gate of the second transistor is connected to the first common point through the seventh resistor, the source of the second transistor is grounded, and the drain of the second transistor is connected to the second common point through the ninth resistor and the twelfth resistor in sequence.

[0011] The gate of the third transistor is connected to the first common point through the eighth resistor, the source of the third transistor is grounded, and the drain of the third transistor is connected to the second common point through the tenth resistor and the thirteenth resistor in sequence.

[0012] The second bias voltage is connected to the common terminal of the ninth and twelfth resistors through the eleventh resistor;

[0013] The reference potential is connected to the common terminal of the tenth and thirteenth resistors through the fourteenth resistor;

[0014] The second common point is output to the host computer after passing through the sixteenth resistor.

[0015] A fifth resistor and a second capacitor are connected in series between the output terminal of the first bias voltage and ground.

[0016] A fifteenth resistor and a third capacitor are connected in series between the output terminal of the second bias voltage and ground.

[0017] A seventeenth resistor and a fourth capacitor are connected in series between the output terminal of the reference potential and ground.

[0018] The power amplifier circuit for a bubble sensor in a high-pressure injector described in this invention has the advantage of maximizing the utilization of the limited optical components in the high-pressure injector, converting the originally binarized optical signal into a continuously changing analog signal, and ultimately providing the host computer with the maximum information capacity for reference information in subsequent work. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the sensor power amplifier circuit described in this utility model.

[0020] Figure label:

[0021] R01~R17, the first to the seventeenth resistors;

[0022] C1 to C4, the first to fourth capacitors;

[0023] M1 to M3 are the first to third transistors;

[0024] D1 photodiode;

[0025] Vb1~Vb2 First to Second Bias Voltages;

[0026] Fre (reference potential);

[0027] A. First common point;

[0028] B. Second common point. Detailed Implementation

[0029] like Figure 1 As shown, the power amplifier circuit for a bubble sensor in a high-pressure injector described in this utility model has the following structure:

[0030] The anode of photodiode D1 is connected to Vcc via a first resistor R01. The cathode of photodiode D1 is grounded via a second resistor R02 and a first capacitor C1. The photodiode D1 is used to acquire light transmitted through the infusion tube and convert it into an electrical signal.

[0031] The gate of the first transistor M1 is connected to the cathode of the photodiode D1 through the third resistor R03, the source of the first transistor M1 is grounded, and the drain of the first transistor M1 is connected to the first common point through the fourth resistor R04.

[0032] The first bias voltage is connected to the first common point through the sixth resistor R06. A fifth resistor R05 and a second capacitor C2 are also connected in series between the output terminal of the first bias voltage and ground.

[0033] The gate of the second transistor M2 is connected to the first common point through the seventh resistor R07, the source of the second transistor M2 is grounded, and the drain of the second transistor M2 is connected to the second common point through the ninth resistor R09 and the twelfth resistor R12 in sequence.

[0034] The gate of the third transistor M3 is connected to the first common point through the eighth resistor R08, the source of the third transistor M3 is grounded, and the drain of the third transistor M3 is connected to the second common point through the tenth resistor R10 and the thirteenth resistor R13 in sequence.

[0035] The second bias voltage is connected to the common terminal of the ninth resistor R09 and the twelfth resistor R12 via the eleventh resistor R11. A fifteenth resistor R15 and a third capacitor C3 are also connected in series between the output terminal of the second bias voltage and ground.

[0036] The reference potential is connected to the common terminal of the tenth resistor R10 and the thirteenth resistor R13 via the fourteenth resistor R14. A seventeenth resistor R17 and a fourth capacitor C4 are also connected in series between the output terminal of the reference potential and ground.

[0037] The second common point is output to the host computer via the sixteenth resistor R16. The host computer is the main unit of the high-pressure injector.

[0038] The working principle of the power amplifier circuit for a bubble sensor in a high-pressure injector described in this utility model is as follows: Light from the bubble sensor passes through the infusion tube and falls on a photodiode D1. Different concentrations and types of medications passing through the infusion tube cause changes in the transmitted light intensity. The photodiode D1 detects these changes in light intensity and converts them into an electrical signal that affects the cathode potential. This electrical signal is amplified by the first transistor M1 and then output. The second transistor M2 and the third transistor M3 simultaneously act as the subsequent amplification stage, further amplifying the output signal from the first transistor M1 before outputting it. The second transistor M2 and the third transistor M3, through two-way amplification, are coupled to a second common point for output, which reduces amplification errors and results in a smoother output signal.

[0039] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model.

Claims

1. A power amplifier circuit for a bubble sensor in a high-pressure injector, characterized in that, It has the following structure: The anode of the photodiode (D1) is connected to Vcc through a first resistor (R01); the cathode of the photodiode (D1) is grounded through a second resistor (R02) and a first capacitor (C1); the photodiode (D1) is used to acquire the light transmitted through the infusion tube and convert it into an electrical signal. The gate of the first transistor (M1) is connected to the cathode of the photodiode (D1) through the third resistor (R03), the source of the first transistor (M1) is grounded, and the drain of the first transistor (M1) is connected to the first common point through the fourth resistor (R04). The first bias voltage is connected to the first common point through the sixth resistor (R06); The gate of the second transistor (M2) is connected to the first common point through the seventh resistor (R07), the source of the second transistor (M2) is grounded, and the drain of the second transistor (M2) is connected to the second common point through the ninth resistor (R09) and the twelfth resistor (R12) in sequence. The gate of the third transistor (M3) is connected to the first common point through the eighth resistor (R08), ​​the source of the third transistor (M3) is grounded, and the drain of the third transistor (M3) is connected to the second common point through the tenth resistor (R10) and the thirteenth resistor (R13) in sequence. The second bias voltage is connected to the common terminal of the ninth resistor (R09) and the twelfth resistor (R12) through the eleventh resistor (R11); The reference potential is connected to the common terminal of the tenth resistor (R10) and the thirteenth resistor (R13) through the fourteenth resistor (R14); The second common point is output to the host computer after passing through the sixteenth resistor (R16).

2. The power amplifier circuit for a bubble sensor in a high-pressure injector according to claim 1, characterized in that, A fifth resistor (R05) and a second capacitor (C2) are connected in series between the output terminal of the first bias voltage and ground.

3. The power amplifier circuit for a bubble sensor in a high-pressure injector according to claim 1, characterized in that, A fifteenth resistor (R15) and a third capacitor (C3) are connected in series between the output terminal of the second bias voltage and ground.

4. The power amplifier circuit for a bubble sensor in a high-pressure injector according to claim 1, characterized in that, A seventeenth resistor (R17) and a fourth capacitor (C4) are connected in series between the output terminal of the reference potential and ground.

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