CN201346204Y

CN201346204Y - Tidal volume calibration system

Info

Publication number: CN201346204Y
Application number: CNU2008201578837U
Authority: CN
Inventors: 王应华; 宋智广
Original assignee: Shanghai Lishen Scientific Equipment Co Ltd
Current assignee: Shanghai Lishen Scientific Equipment Co Ltd
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2009-11-18
Anticipated expiration: 2018-12-26

Abstract

The utility model relates to a tidal volume calibration system, which comprises a flow input unit, a flow control unit, a tidal volume calculation unit, a tidal volume measurement unit and a flow control valve unit; wherein the flow control valve unit is connected with the flow control unit; the flow input unit sets a corresponding flow range according to an actual requirement; the flow control unit outputs corresponding flow according to the signal of the flow control valve unit; the tidal volume calculation unit converts the received flow information into a tidal volume output; and the flow control valve unit correspondingly rotates according to the tidal volume value measured by the tidal volume measurement unit and has a one-to-one relation with the flow inputted by the flow input unit. The tidal volume calibration system for an anesthesia apparatus thoroughly avoids errors which are caused when the measurement of tidal volume is affected by the dead space volume of the apparatus, the aperture of a conduit, the weight of a bellows and a few outside factors, and has the advantages of high efficiency, high accuracy, convenient operation and the like.

Description

A kind of calibration system of tidal volume

Technical field

This utility model relates to a kind of calibration system, particularly a kind of calibration system that is used for medical anesthesia respirator tidal volume.

Background technology

The tidal volume of existing anesthetic machine generally all adopts operated proportional flow control valve to control, and proportional solenoid is controlled the aperture of the restriction of choke valve or flow speed control valve by input signal PWM, realizes controlling continuously or pari passu the output flow of tidal volume.The opening degree of restriction is by the voltage pwm size decision of the input signal of proportional solenoid, operated proportional flow control valve is mainly used in out circuit controls (open loopcontrol), the output of proportional control valve and the proportional relation of input signal PWM, and the magnetic force that solenoid is produced in proportional control valve size is directly proportional with electric current, thereby the opening degree of control orifice is controlled the size of flow.

The calibration system of the tidal volume of existing anesthetic machine all is to adopt the opening degree of demarcating control valve by changing, controls the flow of flow control valve by opening degree, makes the consistent purpose that reaches the demarcation tidal volume of tidal volume of tidal volume and setting this flow under.

But, because patient expired end and flow-control end exist device dead space amount and pipeline vapour lock, existing calibration system is by increasing proportionality coefficient analog dead space amount and increasing the tidal volume that a gas resistance device simulation pipeline vapour lock is adjusted the end of breathing out at flow control valve, and the own wt and the influence of some extraneous factors of in fact installing dead space amount, pipeline aperture, bellows are very difficult mimic fully, tending to produce very big error, is accurate inadequately so only depend on by increasing proportionality coefficient and gas resistance device.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of calibration system of tidal volume, improves medical anesthetic machine effectively to the accuracy that patient sucks or the exhalation tidal volume is controlled, can visual and accurate control tidal volume.

For solving the problems of the technologies described above, this utility model is taked following technical scheme: a kind of calibration system of tidal volume, described calibration system comprises the flow input equipment that connects successively, volume control device, tidal volume is calculated device, the tidal volume measuring device, also comprise the flow control valve assembly that is connected with described volume control device, corresponding range of flow is set in described flow input equipment according to actual needs, described volume control device is exported corresponding flow according to the signal of described flow control valve assembly, described tidal volume is calculated device the flow information that receives is converted into tidal volume output, the moisture value that described flow control valve assembly is surveyed according to the tidal volume measuring device is done corresponding rotation, and the position of each rotation is corresponding one by one with the flow of flow input equipment input.

The calibration system of anesthesia apparatus tidal volume of the present utility model, improved the degree of accuracy that tidal volume is demarcated, adopt the direct flow control valve assembly of regulating to control flow, thereby adjustment tidal volume, avoided fully because the own wt of device dead space amount, pipeline aperture, bellows and some extraneous factors influences the error that causes when tidal volume is measured, had efficient height, accuracy height and a plurality of advantages such as easy to operate.

Description of drawings

Fig. 1 is the framework sketch map of the calibration system of a kind of tidal volume of the present utility model.

The specific embodiment

For technological means, creation characteristic that this utility model is realized, reach purpose and effect is easy to understand, below in conjunction with accompanying drawing this utility model is further elaborated.

As shown in Figure 1, a kind of calibration system of tidal volume, described calibration system comprises the flow input equipment 1 that connects successively, volume control device 2, tidal volume is calculated device 3, tidal volume measuring device 4, also comprise the flow control valve assembly 5 that is connected with described volume control device 2, corresponding range of flow is set in described flow input equipment 1 according to actual needs, described volume control device 2 is exported corresponding flow according to the signal of described flow control valve assembly 5, described tidal volume is calculated device 3 flow information that receives is converted into tidal volume output, the moisture value that described flow control valve assembly 5 is surveyed according to tidal volume measuring device 4 is done corresponding rotation, and the position of each rotation is corresponding one by one with the flow of flow input equipment 1 input.

Concretely, respiratory frequency and respiratory quotient are set in described flow input equipment 1, such as setting respiratory frequency is 20 times/minute, inspiratory/expiratory (I: E) be 1: 2, and calibrational capacity scope according to actual needs, choose several flow points arbitrarily as fixed point, preferable, we choose starting point and intermediary several flow as fixed point, such as range of flow is 1980～72000mL/min, we choose 1980L/min, 6000mL/min, 12000mL/min, 18000mL/min, 30000mL/min, 48000mL/min, the flow of 72000mL/min this some, calculate the value of tidal volume by formula V=FT, wherein, the unit of tidal volume V is mL, the unit of inspiratory flow F is mL/min, the unit of inspiratory duration T is min, under the situation of respiratory frequency of determining and inspiratory/expiratory, such as inspiratory flow is 18000mL/min, inspiratory duration be 1/ (20 times/min) * 1/ (1+2)=1/60min/ time, then tidal volume is V=18000L/min * 1/60min=300mL, the tidal volume of above-mentioned like this each flow correspondence of choosing just can be calculated, and is respectively 33mL, 100mL, 200mL, 300mL, 500mL, 800mL, 1200mL;

The opening degree of the described flow control valve assembly 5 of manual adjustments, tidal volume by 4 pairs of above-mentioned fixed points of described tidal volume measuring device is searched for one by one, and the location records that flow control valve 5 knobs that search tidal volume are forwarded to and preserving, the tidal volume that measures such as tidal volume measuring device 4 is 33ml, regulate the location records position such as the A1 at this moment of the knob of flow control valve assembly 5, the ascending then tidal volume 100mL that searches for other one by one, 200mL, 300mL, 500mL, 800mL, 1200mL, the position that obtains is A2 respectively, A3, A4, A5, A6, A7, obtain a flow like this and be respectively 1980L/min, 6000mL/min, 12000mL/min, 18000mL/min, 30000mL/min, 48000mL/min, 72000mL/min and flow control valve knob position are respectively A1, A2, A3, A4, A5, A6, the curve one to one of A7, so just set up the matched curve figure of a flow and flow control valve knob position, under respiratory frequency of setting and inspiratory/expiratory, the tidal volume of setting just can be calculated flow value, extrapolate the flow control valve knob position A of this moment according to matched curve figure again and control flow, realized the manual demarcation of tidal volume.

The manual calibration system of anesthesia apparatus tidal volume of the present utility model, by the corresponding relation between tidal volume and the flow, i.e. V=F*T obtains the corresponding curve chart of a flow and flow control valve position of rotation, has improved the degree of accuracy that tidal volume is demarcated.This utility model also proposes tidal volume measuring device 4 directly is connected with patient expired end, make the machine that adopts this utility model calibration system in running order following time, adjust the position of flow control valve knob by the tidal volume of the patient expired end of real-time measurement, any owing to not existing between flow control valve and the exhalation end because device dead space amount and vapour lock cause the measurement error of tidal volume, improved the tidal volume certainty of measurement greatly.

Ultimate principle of the present utility model and principal character and advantage thereof have more than been described.The technical staff of the industry should understand, and this utility model is not restricted to the described embodiments, and under the prerequisite that does not break away from this utility model spirit and scope, various changes and modifications all fall in claimed this utility model scope.

Claims

1, a kind of calibration system of tidal volume, it is characterized in that: described calibration system comprises the flow input equipment that connects successively, volume control device, tidal volume is calculated device, the tidal volume measuring device, also comprise the flow control valve assembly that is connected with described volume control device, corresponding range of flow is set in described flow input equipment according to actual needs, described volume control device is exported corresponding flow according to the signal of described flow control valve assembly, described tidal volume is calculated device the flow information that receives is converted into tidal volume output, the moisture value that described flow control valve assembly is surveyed according to the tidal volume measuring device is done corresponding rotation, and the position of each rotation is corresponding one by one with the flow of flow input equipment input.

2, the calibration system of a kind of tidal volume according to claim 1 is characterized in that: described tidal volume measuring device is connected with patient expired end.