High pressure syringe with differential alarm function

Abstract

This invention discloses a high-pressure injector with a differential speed alarm function, relating to medical devices. It addresses the lack of effective monitoring of the actual rotational speed of the roller pressing mechanism in existing technologies. A laser sensor is installed on the top of the roller pressing mechanism; the laser sensor inputs the movement signal f0 of the pressing roller to the differential speed alarm circuit; the differential speed alarm circuit acquires the output voltage V1 of the host to the drive motor and obtains a reference voltage Vfer; based on the reference voltage Vfer, the output voltage V1 is converted into an upper and lower speed limit; the actual rotational speed corresponding to the movement signal f0 is compared with the upper and lower speed limits respectively, and an alarm is triggered when the actual rotational speed exceeds the upper and / or lower speed limits. The advantage is that by monitoring the actual rotational speed of the roller pressing mechanism through hardware circuitry, it can promptly detect sudden situations such as shutdown, as well as differential speed issues caused by aging, temperature drift, and other daily environmental factors. In daily operation, it can promptly detect differential speed exceeding the threshold and remind equipment maintenance, improving safety.

Description

Technical Field

[0001] This invention relates to medical devices, and more particularly to a high-pressure injector with a differential speed alarm function. Background Technology

[0002] High-pressure injectors are used to inject contrast agents and other medications directly into the human body by pressurizing the infusion tubing through a roller pressure mechanism, such as CN117563078A.

[0003] The infusion rate is controlled by the host computer's software program, primarily by controlling the speed of the drive motor in the wheel pressure mechanism. However, with increased usage time (e.g., after 1000 hours), uncontrollable issues such as drive shaft wear, aging / temperature drift of control circuit components, etc., may cause speed differences in the motor's transmission to the wheel pressure mechanism that go undetected by the main control program. For example, if the host computer's software program deems an infusion rate of φ1, it will output voltage V1 to the drive motor. However, when a speed difference occurs, the motor, under the control of voltage V1, may cause the actual output rate of the wheel pressure mechanism to the infusion tubing to be ω2. ω1 relative to ω2 could be a positive Δω or a negative Δω, and it is unpredictable. Since the software program only monitors the output voltage V1 and does not monitor the actual speed ω2 of the wheel pressure mechanism, this can lead to unknowingly infusions at a deviated rate. If Δω exceeds a certain range, it will certainly have adverse effects on the patient.

[0004] On the other hand, because the contact between the roller pressure mechanism and the infusion tubing is very tight, and in actual operation, the main unit's panel is covered by a flip-top door. If the tube jams and the roller stops rotating (actual speed ω2 = 0), medical staff can usually only open the flip-top door to check after hearing an abnormal noise, and cannot directly detect the stoppage. Some high-pressure injector models monitor the stoppage situation, while others do not have a stoppage monitoring function. Even if a stoppage monitoring function is provided, it relies entirely on the main unit's software program. The reliability of software programs is generally lower than that of pure hardware circuits. Therefore, there is currently no equipment that can monitor the actual rotation speed of the roller pressure mechanism in hardware. Summary of the Invention

[0005] The purpose of this invention is to provide a high-pressure injector with a differential speed alarm function to solve the problems existing in the prior art.

[0006] The high-pressure injector with differential alarm function described in this invention has a laser sensor on the top of the pressure wheel mechanism; the laser sensor inputs the movement signal f0 of the pressure wheel to the differential alarm circuit;

[0007] The differential alarm circuit acquires the output voltage V1 of the host to the drive motor and acquires the reference voltage Vfer; it converts the output voltage V1 into an upper speed limit and a lower speed limit based on the reference voltage Vfer; it compares the actual speed corresponding to the movement signal f0 with the upper speed limit and the lower speed limit respectively, and alarms when the actual speed exceeds the upper speed limit and / or the lower speed limit.

[0008] The specific structure of the differential speed alarm circuit is as follows:

[0009] The input terminal of the square wave generator is connected to the signal output terminal L1 of the laser sensor. The output terminal of the square wave generator is input to the first input terminal of the first digital comparator and the first input terminal of the second digital comparator after passing through the third counter.

[0010] The output voltage V1 is connected to the first input terminal of the first adder, and the reference voltage Vfer is connected to the second input terminal of the first adder via an inverter; the output terminal of the first adder is connected to the second input terminal of the first digital comparator via a first integrator circuit and a first counter in sequence; the input terminal of the first flip-flop is connected to the output terminal of the first integrator circuit, and the output terminal of the first flip-flop is connected to the reset terminal of the first integrator circuit.

[0011] The output voltage V1 is connected to the first input terminal of the second adder, and the reference voltage Vfer is connected to the second input terminal of the second adder; the output terminal of the second adder is connected to the second input terminal of the second digital comparator after passing through the second integrator circuit and the second counter in sequence; the input terminal of the second flip-flop is connected to the output terminal of the second integrator circuit, and the output terminal of the second flip-flop is connected to the reset terminal of the second integrator circuit.

[0012] The output of the first digital comparator is connected to the first input of the NAND gate, the output of the second digital comparator is connected to the second input of the NAND gate, and the output of the NAND gate is connected to an alarm bell.

[0013] The first digital comparator compares the result of the first counter with the result of the third counter. When the result of the first counter is less than the result of the third counter, it outputs 1 to the NAND gate; otherwise, it outputs 0. The second digital comparator compares the result of the second counter with the result of the third counter. When the result of the second counter is greater than the result of the third counter, it outputs 1 to the NAND gate; otherwise, it outputs 0.

[0014] The high-pressure injector with differential speed alarm function described in this invention has the advantage of monitoring the actual rotational speed of the roller pressure mechanism through hardware circuitry. This allows for timely detection of sudden situations such as shutdowns, as well as monitoring of differential speed caused by daily environmental factors such as aging and temperature drift. In daily operation, it can promptly detect differential speed exceeding the threshold, prompting equipment maintenance and improving safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the high-pressure injector described in this invention.

[0016] Figure 2 yes Figure 1 A magnified view of the top of the intermediate roller pressing mechanism.

[0017] Figure 3 This is a circuit diagram of the differential alarm circuit described in this invention.

[0018] Figure label:

[0019] 10-Pressing mechanism, 11-Pressing roller, 20-Laser sensor. Detailed Implementation

[0020] like Figure 1 , Figure 2 As shown, the high-pressure injector with differential speed alarm function described in this invention has a laser sensor on top of the pressure roller mechanism. The laser sensor inputs the movement signal f0 of the pressure roller to the differential speed alarm circuit.

[0021] The differential alarm circuit acquires the output voltage V1 of the host to the drive motor and obtains a reference voltage Vfer. Based on the reference voltage Vfer, the output voltage V1 is converted into an upper speed limit and a lower speed limit. The actual speed corresponding to the movement signal f0 is compared with the upper speed limit and the lower speed limit respectively. An alarm is triggered when the actual speed exceeds the upper speed limit and / or the lower speed limit.

[0022] like Figure 3 As shown, the specific structure of the differential alarm circuit is as follows:

[0023] The input terminal of the square wave generator is connected to the signal output terminal L1 of the laser sensor. The output terminal of the square wave generator is input to the first input terminal of the first digital comparator and the first input terminal of the second digital comparator after passing through the third counter.

[0024] The output voltage V1 is connected to the first input terminal of the first adder, and the reference voltage Vfer is connected to the second input terminal of the first adder via an inverter. The output terminal of the first adder is connected to the second input terminal of the first digital comparator via a first integrator circuit and a first counter. The input terminal of the first flip-flop is connected to the output terminal of the first integrator circuit, and the output terminal of the first flip-flop is connected to the reset terminal of the first integrator circuit.

[0025] The output voltage V1 is connected to the first input terminal of the second adder, and the reference voltage Vfer is connected to the second input terminal of the second adder. The output terminal of the second adder is connected to the second input terminal of the second digital comparator after passing through the second integrator circuit and the second counter in sequence. The input terminal of the second flip-flop is connected to the output terminal of the second integrator circuit, and the output terminal of the second flip-flop is connected to the reset terminal of the second integrator circuit.

[0026] The output of the first digital comparator is connected to the first input of the NAND gate, the output of the second digital comparator is connected to the second input of the NAND gate, and the output of the NAND gate is connected to an alarm bell.

[0027] The first digital comparator compares the result of the first counter with the result of the third counter. When the result of the first counter is less than the result of the third counter, it outputs 1 to the NAND gate; otherwise, it outputs 0. The second digital comparator compares the result of the second counter with the result of the third counter. When the result of the second counter is greater than the result of the third counter, it outputs 1 to the NAND gate; otherwise, it outputs 0.

[0028] The working principle of the high-pressure injector with differential speed alarm function described in this invention is as follows:

[0029] The signal output terminal L1 outputs a movement signal f0 to the square wave generator as an analog signal. Each time the pressure roller passes the laser sensor, a wave peak is generated, and the square wave generator converts this analog signal into a square wave signal. The third counter counts the converted square wave signal to obtain N0, which is equivalent to the actual rotational speed ω2 of the pressure roller mechanism. The first adder subtracts the reference voltage Vfer from the output voltage V1, and the first integrator circuit rearranges it into a triangular wave in the time domain. The first calculator counts the triangular wave from the first integrator circuit to obtain N2, which is equivalent to the acceptable lower limit ωmin centered on the control rotational speed ω1 output by the host software program. Similarly, the second adder adds the reference voltage Vfer to the output voltage V1, and the second integrator circuit rearranges it into another triangular wave in the time domain. The second calculator counts the triangular wave from the second integrator circuit to obtain N1, which is equivalent to the acceptable upper limit ωmax centered on the control rotational speed ω1 output by the host software program. The first and second flip-flops function the same way: to reset the integrator circuit when its output voltage reaches a threshold, thus achieving periodic integration and generating a triangular wave. Because the voltage at the output of the second adder is higher, the integration period of the second integrator circuit is shorter, resulting in a larger count N1.

[0030] The first digital comparator compares N2 with N0. When N2 is less than N0, it outputs 1 to the NAND gate; otherwise, it outputs 0. The second digital comparator compares N1 with N0. When N1 is greater than N0, it outputs 1 to the NAND gate; otherwise, it outputs 0. Under the control of the NAND gate, the alarm will not work only when N0 is within its upper and lower limits; otherwise, the alarm will sound.

[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 invention.

Claims

1. A high-pressure injector with differential speed alarm function, characterized in that, A laser sensor is installed on the top of the wheel pressing mechanism; the laser sensor inputs the movement signal f0 of the pressing wheel to the differential alarm circuit; The differential alarm circuit acquires the output voltage V1 of the host to the drive motor and acquires the reference voltage Vfer; it converts the output voltage V1 into an upper speed limit and a lower speed limit based on the reference voltage Vfer; it compares the actual speed corresponding to the movement signal f0 with the upper speed limit and the lower speed limit respectively, and alarms when the actual speed exceeds the upper speed limit and / or the lower speed limit.

2. The high-pressure injector with differential speed alarm function according to claim 1, characterized in that, The specific structure of the differential speed alarm circuit is as follows: The input terminal of the square wave generator is connected to the signal output terminal L1 of the laser sensor. The output terminal of the square wave generator is input to the first input terminal of the first digital comparator and the first input terminal of the second digital comparator after passing through the third counter. The output voltage V1 is connected to the first input terminal of the first adder, and the reference voltage Vfer is connected to the second input terminal of the first adder via an inverter; the output terminal of the first adder is connected to the second input terminal of the first digital comparator via a first integrator circuit and a first counter in sequence. The input terminal of the first flip-flop is connected to the output terminal of the first integrator circuit, and the output terminal of the first flip-flop is connected to the reset terminal of the first integrator circuit. The output voltage V1 is connected to the first input terminal of the second adder, and the reference voltage Vfer is connected to the second input terminal of the second adder; the output terminal of the second adder is connected to the second input terminal of the second digital comparator after passing through the second integrator circuit and the second counter in sequence. The input terminal of the second flip-flop is connected to the output terminal of the second integrator circuit, and the output terminal of the second flip-flop is connected to the reset terminal of the second integrator circuit. The output of the first digital comparator is connected to the first input of the NAND gate, the output of the second digital comparator is connected to the second input of the NAND gate, and the output of the NAND gate is connected to an alarm bell. The first digital comparator compares the result of the first counter with the result of the third counter. When the result of the first counter is less than the result of the third counter, it outputs 1 to the NAND gate; otherwise, it outputs 0. The second digital comparator compares the result of the second counter with the result of the third counter. When the result of the second counter is greater than the result of the third counter, it outputs 1 to the NAND gate; otherwise, it outputs 0.

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