DD230130A3 - CIRCUIT ARRANGEMENT FOR THE ELECTRONIC MEASUREMENT OF THE TOP AND TORQUE VALUES OF THE VENTILATION PRESSURE - Google Patents

Abstract

The invention relates to a circuit arrangement for measuring the peak and instantaneous value of a ventilation pressure and is applicable in connection with the circuit arrangement of an anesthetic or Therapieiebeatmungsgeraetes. It is characterized by a pulse shortening circuit and a subordinate analog-to-digital converter, which converts the applied measured value into a digital signal in the BCD code. The circuit arrangement realizes cost-effective and precise measurement of the peak and instantaneous value.

Description

Circuit arrangement for the electronic measurement of the peak and instantaneous values of the beat pressure

Field of application of the invention:

The invention relates to a circuit arrangement for the electronic measurement of the peak and instantaneous values of the respiratory pressure, which is in particular connected to the control of a ventilator intended for the operation of anesthesia ventilation with automatic and manual ventilation. As a result, the invention also relates to a circuit which controls each control of the ventilator Anesthesia ventilator or short and long-term ventilator is switchable

Characteristic of the known technical, solutions:

There are known electronic ventilation pressure and IPrequensmonitore, which are combined with anesthetic ventilators and measure the ventilation pressure in the patient's breathing system via a special Änfehlußstück (Dräger prospect 6463, 2 # issue, February 1981) · This range 0 to 10 kPa measurable pressure is displayed on a non-inertial analogue display and, in addition, on an analogue display, the one from the

periodic pressure build-up and waste electronically determined respiratory rate shows * These devices offer undoubtedly good measuring 'and monitoring capabilities of ventilation measures in operating rooms and intensive care _t them but are not designed for machine ventilation the peak value and measure the instantaneous value of the ventilation pressure with manual ventilation or "be safeguarded show ·

Furthermore, electronic monitors are known which monitor the ventilation pressure and the ventilation frequency by means of a vascular system based on blocks, but which is provided with functional units for a continuous display of the peak value of the respiratory pressure and with analog measured value outputs, u "a * for the instantaneous value of the respiratory pressure (MLW brochure "Ventiwara 101", print No. III-18-149 Lp 1644 - 78) "These monitors are universally compatible with all pressure, time and volume-controlled ventilators for controlled and assisted short- and long-term ventilation as well as for anesthesia ventilation can be used, have a working range for the mean value of the respiratory pressure of also 0 to 10 kPa and work areas for the peak value of 1 to 10 kPa and for the instantaneous value of -2 to 10 kPa * As already mentioned, takes place in this Monito the pressure - and frequency monitoring of the types of measurement and ranges by self-contained Fun ction units * The same applies to the measurement of the peak value of the respiratory pressure and its storage until the next respiratory cycle. Bs occurs by first converting the instantaneous value of the respiratory pressure into an analogue voltage signal by means of suitable pressure transducers, which then uses a half-wave rectification and charging of a capacitor to determine the peak value is realized * By means of additional circuit expense taken into account in the functional units, the measured value is then stored until the next respiratory cycle * Switching to instantaneous value measurement with manual ventilation does not exist *

The modern ventilation techniques are taking into account special technical features for example, a humidification, Og mixture u · a. constructed so expedient and adaptable that excellent lung ventilation and lung stabilization was made possible and their monitoring by adapting an electronic ventilation pressure and frequency monitor to the control electronics is feasible ·

Such an adaptability is provided by ein · B · a ventilator for harkotic ventilation with automatic and manual ventilation, equipped with a bellow in bottle system for automatic operation and a manual ventilation bag for manual operation (DD-WP A 61 M / 244 800.7). In this ventilator, the circuit provided with a controller for frequency and respiratory time ratio on a switching unit, which is signal-linked via a first and a second U / P converter and a switch-off delay with a designed for multiple functions switch · The Omschalteinheit, which is connected via another U / P converter is also connected to the "bellow in bottle" system and the respiratory gas connection to the anesthetic circuit part, is also connected to a signal delay with the switch-off first OR gate, which has a second ODEH gate with the switch and a The control element downstream of the memory element is connected to the output side. This control element can be adaptively connected to an electronic ventilation pressure monitor and its two units remain autonomous usable with each other ·

Object of the invention:

The aim of the invention is, by taking advantage of known ventilation techniques, especially the existing

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Measuring possibility of the respiratory pressure curve by analog-digital conversion, on the one hand to develop a very cost-effective solution for peak value and instantaneous value measurement with storage of their values, on the other hand to enable switching of the peak value measurement to instantaneous value measurement and vice versa »

Explanation of the essence of the invention:

The object of the invention is to provide the circuit arrangement of an anesthesia or therapy ventilation device with a pulse shortening circuit which is to be interconnected in a complex digital manner and thus places the respectively applied measured value for a defined time on an analog-to-digital converter.

According to the invention the object is achieved in that the control of an anesthesia or therapy ventilator with a memory element and this output side is connected to a pulse shortening circuit, the one hand via a Ansteuerstufe a connection to an acted upon by the p ^ x product of an electronic breathing pressure transducer analog-digital Converter (A / D converter) with a series-connected decoder and display part, on the other hand connected via this drive stage and a negator with the intended manual operation switching stage of a designed for multi-function switch *

In the embodiment of the circuit arrangement according to the invention, in a further advantageous signal connection, the pulse shortening circuit of a via both inputs to the memory element signal-linked first NAND gate, an electronic resistance ^ parallel-connected diode, a capacitor and via the one input to the memory element and the other input with the resistor, the diode and the capacitor signal-linked second NAND gate be made »The control stage in turn can be made of two electronic resistance

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Stands and a transistor be constructed, wherein the one resistor connected to the pulse shortening circuit and the other resistor and the transistor connected to the A / D converter and is applied to the voltage U ₃ . Bs can also be suitably summarized the pulse shortening circuit and the associated with their signal functional units of the circuit arrangement as a module of a block system j connected to the controller for frequency and Atemzeitverhältnis directly or via a device output «

EMBODIMENT

An exemplary embodiment of the invention will be described below with reference to a figure and its mode of operation will be explained below. In the figure, the exemplary embodiment is shown in the diagram. Therein, the reference numeral 1 designates a pulse reduction circuit consisting of a first NAND gate of a diode 3, an electronic resistor 4, a capacitor 5 and a second NAND gate 6. The pulse shortening circuit 1 is connected with its NAND gate 2 directly or via a device output 7 with a control element 10 for frequency and respiratory time ratio 8 of an anesthesia or therapy device 9 downstream memory element. On the other hand, the pulse shortening circuit 1 with its NAND gate 6 is connected to a drive stage 11 and via this to an analog-to-digital converter 13 whose second input has a connection to an electronic clock generator 14 / D converter 13 is the output side connected to a decoder 15 and via this with a display part 16. In the connection between the consisting of two electronic resistors 11, 20 and a transistor 12 Ansteuerstufe 19 and the A / D converter is a terminal of an inverter 17 which is signal-linked to the switching stage of a multi-stage switch 18 intended for manual operation.

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The pulse shortening circuit 1 and the signal-linked with them "functional units control stage 19" A / D converter 13, inverter 17, etc. "can be summarized as an assembly of a block system» whose connection would be made via the device output 7 and a signal output 21 · The breathing pressure generator 14 in turn for example connected to the circulation part (not shown) *

With this invention, which presupposes the feeding of the measured Atemdruckyerlaufes ρ • *% with the electronic breathing pressure generator 14 as known, is guided by him as P (^) - product to the A / D converter 13 measuring signal and the digital output possibility of the decoded measured value used by the display part 16 "that means" when there is a defined potential at the input of the A / MM in "fast mode" the applied measured value about 80 times per second into a digital signal in the BGD-Gode and convert to a 7-segment display , so the display part to transfer 16 »This so connected analog-to-digital converter has the further advantage that when a different defined potential at the same input of the A / D converter 13 this operates in" hold mode ", ie #, the last recorded measured value is stored, there is no further conversion · This mode of operation is preceded by the fact that the control pulse resulting from the end of the inspiration s of the anesthesia or therapy ventilator 9 (developed, for example, according to DD-WP A 61 M / 244 800.7) at the output of the memory element 10 and is converted by the pulse shortening circuit 1 in a Rechteokiinpuls of 10 ms width, After this conversion, the rectangular pulse on the Drive stage 19 to the A / D converter 13 out, so that the inlet side of the A / D converter 13, the required potential for "fast mode" is created while in the remaining time of the A / D converter 13 in "hoId operation" According to the invention, it is thus achieved that the peak value of the respiratory pressure pending at the end of inspiration is measured for 10 ms, but the remaining time is stored and displayed.

The advantage of the circuit arrangement described here lies in the exact detection of the peak value, since 10 ms are small compared to the switching times of the pneumatic inspiration and expiration signals. A further advantage results from the circuit design, which is kept to a minimum and still allows any change in the subsequent one Breathing, instantaneous and complete detection · The instantaneous value of the ventilation pressure is also obtained by taking advantage of the characteristic of the A / D converter 13 with a third defined potential for "slow operation" at its input Switch 18 in the switch position "manual ventilation" coming signal used, which is supplied as a Η signal to the igniter 17 of the circuit arrangement according to the invention · By the inverter 17, the signal is first negated before it reaches the A / D converter 13 · This receives so an L signal and thus the defined potential for lan gsames, continuous measurement and display · This displays the respective instantaneous value with constantly slower change.

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Claims (3)

Brfindungsanspruchi 1. Circuit arrangement for the electronic measurement of the peak and instantaneous values of the respiratory pressure, with a connection for controlling an anesthesia or therapy ventilator, which is switched on or off in dependence on its automatic or manual operation by means of a multi-stage switch, characterized in that the controller ( 8) with a memory element (10) and this output side with a pulse shortening circuit (1) is connected via a control stage (19) on the one hand a connection to a p ^ -Produkt an electronic breathing pressure generator (14) acted upon analog-digital Wandleis ( 13) with series-connected decoder (15) and display part (16), on the other hand via this drive stage (19) and an inverter (17) with the for. manual operation specific switching stage of the switch (18) is connected · 2 «circuit arrangement according to item 1, characterized in that the pulse shortening circuit (1) consists of a via both inputs to the memory element (10) signal-connected first NAND gate (2), an electronic resistor (4) with parallel-connected diode (3), a capacitor (5) and a via the one input to the memory element (10) and via the other input to the resistor (4), the diode (3) and the capacitor (5) signal-linked - second NAND gate (6) . 3 «circuit arrangement according to item 1, characterized in that the drive stage (19) consists of two electronic resistors (11, 20) and a transistor (12) whose one resistor (11) to the pulse shortening circuit (1) connected and the other resistor (20) and transistor (12) connected to the A / D- ^ orler (13) and, is applied to the voltage Ug · 4 _β circuit arrangement according to item 1 to 3, characterized in that the pulse shortening circuit (1) and the signal-linked with their functional units of the circuit arrangement are summarized as an assembly of a modular system, with the interposition of the memory element (10) to the controller for frequency and breath « * Time ratio (8) is connected directly or via a device output (7) and to the switch (18) directly or via a signal output (21) * For this -1 page drawing nuwg