RU1813456C - Catheter - Google Patents

Abstract

The invention relates to medical equipment, in particular to catheters used in the training of surgeons in operations on tubular organs. The catheter contains a housing, inside which there are resistive elements, one of which is connected through a resistor to a constant voltage brush, to a common gate, to the inverting input of the comparator, to the mepereverting input of which a reference voltage source is connected, to the input connected to the peak detector shaper, the output of which is connected to one input of an analog-to-digital converter, its other input is connected to a single-shot, and the output to an indicator of the place of damage. The second current-conducting element is connected to the RS-flip-flop installed at the output of the driver and the indicator of damage depth, and the signaling device is turned on at the output associated with the driver, peak detector and comparator of the D-trigger, to which the indicator of the fault location is also connected.

Description

The invention relates to medical equipment and relates to catheters used in abdominal surgery, thoracic surgery, urology, etc.

The purpose of the invention is to enable the use of a catheter for training surgeons.

Figure 1 shows a catheter, a General view; in FIG. 2, 3 — longitudinal section along AA; in FIG. 4 is a schematic diagram of the electronic part of the device.

The catheter contains a housing 1 of elastic insulating material with perforations 2 at the distal end, while at least the distal portion 3 of the catheter contains on its inner surface a current discharge layer 4 and a flexible film resistive layer 5 isolated from each other (Fig. 1, 2) or additionally contains a lead-in layer 6 facing outward and located in an elastic insulating layer 1 (FIG. 3). A current-carrying conductor 7 connected to the outside through the inner surface is connected to the film resistor 5 at the distal end of the distal portion 3, In the first embodiment (Figs. 1, 2), the electrical conductive layer 4, the resistive layer 5, then, under the lead wire 7, respectively, have terminals a, b, d on the outside (Figs. 1,2). In the embodiment of the device shown in FIG. 3, the current supply layer 6 has an outside terminal c. The electronic part of the device contains a constant voltage source of 8 k

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to which a resistor 9 is connected in series, a resistor 5 which is the resistive layer of the catheter, and a resistor 10 connected by a second contact to the common bus 11. The input of the peak detector (PD) 12 is connected between the resistors 9 and 5, and also connected to the inverting input a comparator 13. A reference voltage source (ION) is connected to the inverting input of the comparator 13. 14. A D-trigger 15 with dynamic recording control With a C-input is connected to the output of the comparator 13. The output of the D-trigger is connected to the input of the one-shot 16, to the input of the circuit alarm 17 damaged catheter and to a control input of the display circuit 18 places damaging the catheter. The output of the single-shot 16 is connected to the ST input of an analog-to-digital converter (ADC) 19. A1 - the input of the ADC 19 is connected to the output of the PD 12. The output of the ADC 19 is connected to the fault location indicator circuit 18. Button switch 20 having normally open contacts is connected to the input of the driver 21 of the initial installation signal. The output of the driver 21 is connected to the R and D inputs of the D-trigger 15, with the input of the initial setup PD 12 and the R-input of the RS-trigger 22, recording signals from the conductive layer 4. The output of the RS-trigger 22 is connected to the depth indication circuit catheter injuries 23. No power circuits indicated.

The device operates as follows.

When applying the supply voltage, the driver 21 generates a pulse in the form of a log O. At this pulse, it resets the D-trigger 15, at the output of which a log is established. Oh, the fault location indicator circuitry 18 will turn off, the alarm circuitry 17 will turn off, the PD 12 will be reset. The RS flip-flop 22 is reset, and a log is set at its output. Oh, and the fault depth indication circuit 23 goes into the off state. The divider, consisting of the first resistor 9, the second resistor 5 and the third resistor 10, connected between the constant voltage source 8 and the common bus 11, supplies the inverter input to the comparator 13, a voltage the magnitude of which exceeds the voltage transmitted from the ION 14 to the inverting input of the comparator 13. Therefore, a log is established at the output of the comparator 13. A. If the catheter is damaged by an electrically conductive surgical instrument, the potential of the common bus 11 is applied to the contact point of the surgical instrument with a resistive layer (resistor) 5. For the first embodiment of the device

(Figs. 1, 2), the potential of the common bus 11 is supplied from the contact to through a conductor connected to a surgical instrument. In the second embodiment of the device (Fig. 3), the potential of the common bus 11 is transferred from the current-carrying layer 6 when a surgical instrument passes through it. After that, the resistor 10 and part of the resistive layer (resistor) 5 between the surgical instrument and the resistor 10 become shorted. As a result, the voltage supplied to the input of the PD 12 and the inverting input of the comparator 13 decreases and turns out to be less than the voltage coming from the ION 14 to the inverting the input of the cparator 13. After that, the PD 12 will fix the voltage level present at its input on the entire output, and the log at the output of the comparator 13. 1, a log will be set at the output of the D-flip-flop 15. 1. As a result, the alarm circuit 17 will turn on, the fault location indicator circuit 18 will turn on, and the one-shot 16 will give a pulse in the form of a log to the ST-input of the ADC 19. 1. At this pulse, the ADC 19 will start working and at its output a code will be set corresponding to the voltage value at the output of the PD 12. In accordance with this code, the circuit for indicating the location of damage 18 will display information about the location of damage to the catheter. If the catheter is deeply damaged, the surgical instrument transfers the potential of the common bus 11 to the damaged catheter current supply layer 4. After that, on the terminal a to which the S-input of the RS-flip-flop 22 is connected, the potential of the common bus 11 is connected. This potential is perceived as a log. Oh, which causes the output of the RS flip-flop 22 to log, 1, which is fed to the input of the depth of damage indication circuit 23, which displays information about the depth of damage of the catheter. When you turn on the alarm circuit 17, the surgical instrument is removed from the surgical wound (zone).

In order to resume the operation of the device, it is necessary to close and open the contacts of the push-button switch 20, while a pulse in the form of a log appears at the output of the driver 21. A. At this pulse, the D-trigger 15 is reset at the output of which a log is established. Oh, disabling the fault location indicator circuit 18, disabling the alarm circuit 17, setting the PD 12 to its original state, resetting the RS flip-flop 22, and the log will be sent to its output. О and the indication circuit of the depth of damage 23 goes into the off state. Next, a log is set to the output of the driver 21. 1.

Then the catheter is ready for further work.

Claims (1)

When using a catheter, a multiple indication of the location and depth of damage is provided, which can significantly improve the quality of the surgeon's work. Shadow formula A catheter containing a body of elastic insulating material, inside which resistive elements are placed, and an alarm device, characterized in that, for the purpose of training surgeons, it is equipped with constant and reference voltage sources, a comparator, a peak detector, RS- and D -triggers, one-shot, shaper, analog-to-digital Converter and indicators of the location and depth of damage, and one of the resistive . UL elements through resistors are connected to a constant voltage source, a common bus, to an inverting input of a comparator, to an inverting input of which a reference voltage source is connected; to the input of the peak detector connected to the driver, to the output of which one input of the analog-to-digital converter is connected, and its other input is connected to a single-vibrator, and the output is with a fault location indicator, the second current-conducting element is connected to the RS-flip-flop installed at the shaper output and the damage depth indicator, and the signaling device is turned on at the output of the peak detector connected to the shaper and the D-trigger comparator, to which the location indicator is also connected damage. I-L F # r2 Y-D Fm.4