A high-pressure injector that automatically shuts down based on bubble sensor monitoring signals

Abstract

This utility model discloses a high-pressure injector with automatic shutdown based on a bubble sensor monitoring signal, relating to medical devices. It addresses the problem of existing technologies relying solely on host software control. The injector comprises a host unit, a bubble sensor, and a pressurizing mechanism. The host unit controls the motor of the pressurizing mechanism, which drives a pressure roller to pressurize the infusion tubing. The bubble sensor acquires the bubble status at the output end of the infusion tubing in real time and feeds it back to the host unit. A shutdown module is also provided, connected in series between the bubble sensor and the pressurizing mechanism. The advantage is that, without affecting the host software's control of the pressurizing mechanism, a parallel shutdown safety branch composed of pure hardware circuitry ensures from both hardware and software perspectives that bubbles exceeding the safety threshold will not enter the human body, thus improving the safety of the medical device.

Description

Technical Field

[0001] This utility model relates to medical devices, and more particularly to a high-pressure injector that automatically stops operation based on a bubble sensor monitoring signal. Background Technology

[0002] Before a radiological examination, contrast agents, saline solution, and other fluids need to be injected into the body using a high-pressure injector. To ensure that air bubbles in the infusion tubing do not exceed a safe threshold, the high-pressure injector has a bubble sensor installed after the tubing is pressurized by the pressurizing mechanism and before it is injected into the body.

[0003] The bubble sensor monitors air bubbles in the infusion tubing. A high-level output indicates the presence of air bubbles; otherwise, it continuously outputs 0. The duration of the high-level signal indicates the length of the bubble; the longer the bubble, the longer the high-level output time. The signal output of the bubble sensor is connected to the main unit of the high-pressure injector. The main unit continuously monitors the high-level status. When the high-level duration exceeds a safety threshold, it immediately stops the pressurization mechanism to prevent air bubbles from entering the body.

[0004] The entire bubble monitoring and pressurization shutdown control process is highly dependent on the host software program, which often has hidden bugs or uncontrollable problems such as channel congestion. Bubbles exceeding the safety threshold entering the human body can cause serious problems such as thrombosis, directly endangering the patient's life. Therefore, a safety mechanism entirely dependent on hardware circuitry needs to be implemented in parallel with the software-dependent solution. Utility Model Content

[0005] The purpose of this invention is to provide a high-pressure injector that automatically stops based on a bubble sensor monitoring signal, so as to solve the problems existing in the prior art.

[0006] The high-pressure injector described in this utility model, which automatically stops based on a bubble sensor monitoring signal, includes a main unit, a bubble sensor, and a pressurizing mechanism. The main unit controls the operation of the motor of the pressurizing mechanism, which drives the pressure roller to pressurize the infusion tubing. The bubble sensor acquires the bubble status at the output end of the infusion tubing in real time and feeds it back to the main unit.

[0007] A shutdown module is also provided, the structure of which is as follows:

[0008] The input terminal of the integrator circuit is connected to the first interface, and the output terminal of the integrator circuit is connected to the non-inverting input terminal of the comparator.

[0009] The inverting input terminal of the comparator is connected to the reference voltage point, and the output terminal of the comparator is connected to the enable terminal of a normally open switch.

[0010] The normally open switch is connected in series between the second interface and ground;

[0011] The first interface is connected to the output terminal of the bubble sensor;

[0012] The second interface is connected to the enable terminal of the motor.

[0013] The first resistor and the first capacitor are connected in parallel to form the integrating circuit.

[0014] The second and third resistors are connected in series between Vcc and ground, and the connection point of the second and third resistors is the reference voltage point. The second and / or third resistors are variable resistors. The variable resistors are rotary variable resistors.

[0015] The high-pressure injector described in this invention, which automatically shuts down based on a bubble sensor monitoring signal, has the advantage of using a parallel stop circuit composed of pure hardware circuitry to ensure that bubbles exceeding the safety threshold do not enter the human body, thus improving the safety of medical devices, without affecting the host software program's control over the pressurization mechanism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the functional modules of the high-pressure injector described in this utility model.

[0017] Figure 2 This is a schematic diagram of the circuit structure of the shutdown module described in this utility model.

[0018] Figure label:

[0019] R1 - First resistor, R2 - Second resistor, R3 - Third resistor;

[0020] C1 - First capacitor;

[0021] U1 - Comparator;

[0022] S1 - Normally open switch;

[0023] J1 - First interface, J2 - Second interface. Detailed Implementation

[0024] like Figure 1 As shown, the high-pressure injector of this invention, which automatically stops based on a bubble sensor monitoring signal, comprises a main unit, a bubble sensor, and a pressurizing mechanism. The main unit controls the operation of the motor of the pressurizing mechanism, which drives the pressure roller to pressurize the infusion tubing. The bubble sensor acquires the bubble status at the output end of the infusion tubing in real time and feeds it back to the main unit. A stop module is also provided, connected in series between the bubble sensor and the pressurizing mechanism.

[0025] like Figure 2 As shown, the shutdown module structure is as follows:

[0026] The input terminal of the integrator circuit is connected to the first interface J1, and the output terminal of the integrator circuit is connected to the non-inverting input terminal of comparator U1. The inverting input terminal of comparator U1 is connected to the reference voltage point, and the output terminal of comparator U1 is connected to the enable terminal of normally open switch S1. The normally open switch S1 is connected in series between the second interface J2 and ground. The first interface J1 is connected to the output terminal of the bubble sensor. The second interface J2 is connected to the enable terminal of the motor. The first resistor R1 and the first capacitor C1 are connected in parallel to form the integrator circuit. The second resistor R2 and the third resistor R3 are connected in series between Vcc and ground, and the connection point of the second resistor R2 and the third resistor R3 is the reference voltage point.

[0027] The working principle of the shutdown module described in this utility model is as follows:

[0028] When no bubbles appear, the output signal of the bubble sensor is 0, and the normally open switch S1 keeps the second interface J2 disconnected from the ground, so as not to interfere with the normal operation of the host and the pressurizing mechanism.

[0029] When a bubble appears, the bubble sensor outputs a high-level signal, continuously charging the first capacitor C1. When the voltage of the first capacitor C1 is higher than the reference voltage, the comparator U1 outputs a high-level signal to the enable terminal of the normally open switch S1, causing the normally open switch S1 to close. This directly grounds the motor enable terminal connected to the second interface J2, causing the motor to stop immediately, and the infusion tubing to stop delivering the medication. The charging time of the first capacitor C1 is equivalent to the time it takes for the bubble sensor to monitor the bubble length; that is, the charging time of the first capacitor C1 can be converted into the bubble length. Therefore, the bubble safety threshold can be equivalent to the magnitude of the reference voltage; the larger the reference voltage setting, the longer the allowed bubble length. The reference voltage can be provided by the second resistor R2 and the third resistor R3 connected in series between Vcc and ground.

[0030] In one embodiment, the second resistor R2 and / or the third resistor R3 are variable resistors, preferably rotary variable resistors. Medical staff can use the knob to adjust the voltage drop across the third resistor R3, thereby adjusting the reference voltage, which is equivalent to adjusting the bubble safety threshold.

[0031] 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 high-pressure injector that automatically stops based on a bubble sensor monitoring signal, comprising a main unit, a bubble sensor, and a pressurizing mechanism; the main unit controls the operation of the motor of the pressurizing mechanism, the motor of the pressurizing mechanism drives the pressure roller to pressurize the infusion tubing; the bubble sensor acquires the bubble status at the output end of the infusion tubing in real time and feeds it back to the main unit; Its features are, A shutdown module is also provided, the structure of which is as follows: The input terminal of the integrator circuit is connected to the first interface (J1), and the output terminal of the integrator circuit is connected to the non-inverting input terminal of the comparator (U1). The inverting input of the comparator (U1) is connected to the reference voltage point, and the output of the comparator (U1) is connected to the enable terminal of the normally open switch (S1). The normally open switch (S1) is connected in series between the second interface (J2) and ground; The first interface (J1) is connected to the output terminal of the bubble sensor; The second interface (J2) is connected to the enable terminal of the motor.

2. The high pressure syringe of claim 1, wherein, The first resistor (R1) and the first capacitor (C1) are connected in parallel to form the integrating circuit.

3. The high pressure syringe of claim 1, wherein, The second resistor (R2) and the third resistor (R3) are connected in series between Vcc and ground, and the connection point of the second resistor (R2) and the third resistor (R3) is the reference voltage point.

4. The high pressure syringe of claim 3, wherein, The second resistor (R2) and / or the third resistor (R3) are variable resistors.

5. The high pressure syringe of claim 4, wherein, The variable resistor is a knob-type variable resistor.

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