SU1644967A1 - Automatic injector - Google Patents

Abstract

The invention relates to medical technology and can be used to automatically administer radiopaque drugs. The purpose of the invention is to improve the safety of the injection by introducing the fractional dosage control unit, the gas embolism protection unit, the air bubble sensor, the medium temperature sensor and the parameter control unit. 1 il.

Description

The invention relates to medical technology and can be used for the automatic introduction of medicinal or X-ray contrast agents into the patient’s vascular system.

The purpose of the invention is to increase the safety of the injection.

The drawing shows the structural scheme of the proposed automatic injector.

The automatic injector contains a switch 1 leads, indicat, p 2, driver 3 sync pulses, synchronized dosing control unit 4, variable delay unit 5, divider 6, remote control 7, fractional dosing control unit 8, single dosing control unit 9, OPF), X-ray machine control unit (PA) 11, switch 12 modes, block; 3 drive controls, drive 14, mechanical load regulator 15, sprmts 16, drug quantity sensor 17 in the syringe, gas embolism protection unit 18 (B GE), air bubble sensor 19, unit 20 avtopodogreva, heating

element 21, the sensor 22 of the temperature of the syringe, the sensor 23 of the ambient temperature and the setting device 24 of the injected drug.

The injector can operate in one of three modes - continuous, single injection, when the dose of the drug is administered at one time; fractional injection, when the drug is administered in two portions, the second dose of the drug is administered at a predetermined time interval, and a cardiosynchronized injection, when the drug is administered in portions between the R-teeth of the ECG. and the interval between these portions is also determined based on the individual characteristics of the patient and his ECG. The mode of injection is selected through a mode switch.

Consider the mode of a single continuous injection.

After turning on the power from the remote control unit 7, the Dose and Va signals are output to the control unit 9 by a single dosage, which determine the magnitude of the total dose of the drug and the speed of its administration, and in block 11, a signal is given that determines the activation time of the RA relative to the start of injection.

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repair, at the same time RA at the request of the operator can be included both to, and in rem or after an injection. From the setting device 24, a signal is given to the autoheating unit 20, which indicates the temperature of the injected preparation, and the sensor 19 and the BZGE 18, gives a signal about the presence or absence of air bubbles in the preparation.

In the auto-heating unit 20, a mutual comparison of a predetermined temperature of the injected drug, an indication of the temperature sensor of the drug in the syringe and an ambient temperature is made, and a comparison results in a signal that the heating element 21 heats the drug in the syringe to a predetermined temperature.

Signals about the compliance of parameters set from block 20, to BZGE 18, and also the signal from sensor 17 of the amount of the drug in the syringe are sent to the BKP 10. A signal up to a given dose is compared to the block with the signal of the amount of the drug in the syringe If Dsh Up was carried out with the program parameters in the normal state, the BKP 10 issues a signal for permitting the injection to the control unit 13 and the signal for enabling the X-ray unit to be turned on to the control unit 11 of the RA.

The signal from the remote control (RC) unit 11 generates the activation signal PA and the start signal (DIR) of the unit 9 of the single dosage control, by which the latter generates the start signal of the drive control unit 13. The ZI signal in block 9 starts integrating the speed signal V3, which is compared with the dose signal Do.

The drive control unit 13 accelerates the drive motor to a predetermined speed V3 set from the console 1. The rotation of the engine is converted by means of a screw gearbox into a translational motion of the syringe piston, as a result of which the drug is injected

At the time when the signal / Uz dt reaches the value of D0, block 9 outputs to the drive control unit a signal that the latter uses to output the drive 14 to a motor braking signal. The adjustment of the load on the engine axles is carried out by the mechanical load controller 15.

Maintaining a given engine speed is accomplished by comparing, in the drive control unit 13, a given speed V3 with the current engine rotational speed, the signal of which is removed from the tachogenerator of the drive 14, overt

is given to the drive control unit 13 via the feedback circuit (OC).

If, during the injection process, the air bubble or temperature of the drug in the syringe goes beyond these limits during injection, the BCP 10 issues a drive control unit 13 and, on the PA control unit 11, a signal to switch them off, at which He10 will stop the authorized injection. unnecessary exposure of the patient in order to ensure his safety.

The operation of the injector in the mode of conducting fractional injection is similar. The difference is that in addition to the signals Pre and V3 from the control unit 7, the fractional dosing control unit 8 sends signals that determine the value of the first portion D1 and the delay between the first and second (D2 Do - DCH) portions. At the same time, I sent a signal f V3 with t. compared with the GH signal. In the case of equality of their values, drug administration is stopped, integration of the V3 signal also ceases. wherein the previous integration result is remembered.

Then, after a predetermined chauze t, the injection is turned on again and at the same time the signal Uz is to be integrated, 2 the integration result is already matched with a signal corresponding to the full dose of Do. At the moment when the signal / Uz d t reaches the value, the injection stops

35 in the manner described

Fractional injection is carried out in the study of parenchymal organs to assess the condition of both the arteries and the capillary system of these organs.

40 Consider the mode where the injection is synchronized with an ECG signal.

In this case, the switch 12 modes is connected to the electrodes that are installed in the ne-0 tient. Using the switch of the tel 1 and the indicator 2 connected to its output, the ECG signal with the most pronounced R-wave is selected from the input signals, which is fed to the sync pulse generator, where for each R-wave

50, a sync pulse Ci / h normalized in amplitude and duration is formed,

The correctness of its formation is monitored by indicator 2 by comparing its temporary position with the temporary position of the R-wave ECG,

The SR pulses are supplied by a synchronized dosing block 4 control and from the variable delay unit 5, which delays them for the time set from the console. The delay time is selected based on

The location of the SIT is outside the phase of the cardiac cycle system. The delayed SR pulses are fed to the divider 6, which divides the frequency i / .x of the repetition by the coefficient entered from the control panel 7.

The division factor is selected by the operator, based on the individual characteristics of the patient's ECG. The pulse pulses from the divider b are also fed to the indicator 2 in order to check the correctness of their temporary position, and also go to the synchronized dosage unit 4, where the control panel 7 also sends signals that determine the value of the total dose of the drug. its introduction v3. The block 4, in the intervals between the pulses CI2 - Ct4i, sends to the block 13 of the drive controls the injection resolution signal, and in the gaps CHi - CI2 blocks its conduction,

The integration of the V3 signal is carried out only in the intervals between CI2 - CI1.

The synchronized injection process is terminated when the signal / Uz d t reaches the value of the signal Do.

In all the examined modes, in the event of a failure of any of the BGs, or the exit of the given parameters beyond the specified limits, the patient's fluoroscopy is stopped in order to avoid undesirable consequences for it.

Claims (1)

Invention Formula The automatic switch containing the lead switch, whose inputs are the inputs of the injector electrocardiogram, "its output is connected to the input of the clock generator and to the first indicator output, the output of the clock generator is connected to the second input of the synchronized dosage controller v through a serially connected variable delay unit and a divider with the third input of the indicator and with the second input of the control unit The third and fourth inputs of which are connected respectively to the outputs of a given speed and dose of the console and to the inputs of the single dose control unit, the trigger inputs of the synchronized and single dose control units are connected to the output output of the X-ray unit control unit, and the outputs of these blocks are connected through a mode switch with an enable input of the drive control unit, the signal input of which is connected to the input of a given speed of the console, a shutdown input of the control drive m is connected to the shutdown input of the control unit of the x-ray apparatus, and its two control outputs are connected to the drive inputs, the output of which is connected to the feedback input of the drive control unit, the drive is kinematically connected to the mechanical load controller, to the syringe piston and to the quantity sensor the drug in the syringe, the sensor of the drug is connected to the first input of the PTA unit, another input of which is connected to the input of the setpoint for the drug being injected, the first output of the heating unit is connected to the first information output of the console, and its second output is connected to the input of the heating element, the outputs for controlling the delay and the division ratio of the console are connected respectively to the inputs of the variable delay and divider unit, and its clock output and output for controlling the delay of activation are connected to the corresponding inputs of the X-ray unit control unit, wherein the control input and the output of the said unit are connected respectively to the input of the remote control and the output to turn on the x-ray apparatus a different in that. In order to improve the safety of the injection, a fractional dosage control unit is inserted into it, four inputs of which are connected respectively to the outputs of a given speed, the dose of the first portion and the setting of the console pause, the fifth input is connected to the output output of the X-ray control unit, and the output of the unit fractional dosing control through a mode switch is connected to the enable input of the drive control unit, the gas embolism protection unit is also inserted into the injector with the air sensor connected to its inputs holes, an ambient temperature sensor connected to the third input of the autoheating unit, and a parameter control unit connected by the first input to the output of the gas embolism protection unit and to the second information input of the console, the second and third inputs of the parameter control unit are connected respectively to the output of the preparation amount sensor e the syringe and the first output of the autoheating unit; the fourth input of the parameter control unit is connected to the dose output of the console; its first output is connected to the shutdown inputs of the drive and rent control units enovskogo apparatus, and its second output is connected to the third data input console.