CN2086038U

CN2086038U - Exposure controller for medical x-ray chest and abdomen film

Info

Publication number: CN2086038U
Application number: CN 91205027
Authority: CN
Inventors: 李利军
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-03-28
Filing date: 1991-03-28
Publication date: 1991-10-02

Abstract

The utility model relates to an exposure controller for the medical X-ray chest and abdomen film, comprising a thermistor, an amplifier, a sample holding circuit, a comparator, and a monostable interface. Using the thermistor to serve as a probe which is put to the patient's nose and mouth point, the patient deeply inhales or deeply exhales for several times, the corresponding circuits connected with the probe keep the maximum value of the deep inhalation and the deep exhalation. At the time, the operator presses a permitting exposure switch, compared with the maximum breathing signal kept by the sampling circuit and a real time breathing signal, when the real time breathing signal is reached or exceeded the keeping maximum signal, the utility model exposes immediately, so as to shoot the optimum X-ray photograph.

Description

Exposure controller for medical X-ray chest and abdomen film

The utility model relates on the medical diagnosis, claps the exposure automatic control equipment of chest abdominal radiograph.

At present, medical arsis X-ray film, patient and operating personnel are not in a Room, and bat chest belly sheet requires aim at the darkest moment of exhaling or inhaling the time of exposure again.Patient and operating personnel are difficult to cooperate like this, especially to children, deaf-mute etc.Though application number is the breathing situation that the utility model of 89211126.7 " the X ray photographic apparatus is breathed automatic monitoring device " can make the operator monitor patient to a certain extent.But these device for mechanical parts are more, use very inconveniently, still can not reach high-level requirement.

The purpose of this utility model is the deficiency at existing equipment, propose a kind of safe, reliable, highly sensitive, cost is low.Volume is little, exposure automatic control equipment easy to use.

The utility model is achieved in that and utilizes thermosensitive probe, picks up the breath signal of surveying the patient.This signal carries out delivering to compensated amplifier after one-level is amplified through differential amplifier, carry out secondary and amplify because exhale, air-breathing breath is variant to the effect of thermosensitive probe.So the amplification of this level should have different gains to breath signal.This compensated amplifier main line structure is: differential amplifier IC ₁Output through C ₇With amplifier IC ₂, IC ₃In-phase end link to each other; IC ₂Output with exhale/inhale selector switch K ₁The contact link to each other; This K switch ₁Fixed contact A and bidirectional analog K switch ₃Control end link to each other K switch ₃The line at two ends is serially connected with adjustable potentiometer W2 and amplifier IC ₃End of oppisite phase between, K switch ₁In addition fixed contact B and bidirectional analog K switch ₄Control end link to each other.K switch ₄Two ends and adjustable potentiometer W ₃Series connection back and resistance R ₁₀And amplifier IC ₃End of oppisite phase, output parallel connection, this compensator is by the bidirectional analog K switch ₃, K ₄, exhale/inhale selector switch K ₁With transport and placing device IC ₃Can compensate and exhale and inhale the difference of temperature-sensitive being visited the some effect, be divided into two-way through the compensator amplifying signal, one the tunnel removes comparator, peak sampling hold circuit is delivered on another road, and comparator is also delivered in sampling and output, and the output of comparator removes to trigger the interface circuit with monostable holding property, in work beginning a period of time (manually decision), peak value sampling has partly kept the peak signal of this section internal respiration.After allowing exposure, comparator will compare the peak signal of breathing the last period that breath signal and sampling keep, in case, existing breath signal meets or exceeds the signal of sample stage, then trigger interface circuit working immediately makes the exposure of X-ray level, has reached its intended purposes.

Advantage of the present utility model: except that safety, reliable, cost is low, volume little, the one-time success rate that X-ray film is taken improves greatly, shortens interval between diagnosis, avoids the economic loss of secondary film making, reduces patient and operating personnel's X ray damage.

Below in conjunction with description of drawings the utility model most preferred embodiment.

Fig. 1 is a utility model work block diagram.

Rt ₁, Rt ₂Negative tempperature coefficient thermistor, 1 differential amplifier, 2 compensated amplifiers, 3 peak sampling hold circuits, 4 comparators, 5 monostable interfaces.

Fig. 2 is the utility model circuit theory diagrams.

IC _1-4, IC ₆Transport and placing device (model LM324), IC ₅Transport and placing device (model: CA3140), IC ₇Time-base circuit (model: NE555), W _1-4Trimmer potentiometer, R _1-7Resistance, C _1-7Electric capacity.D _1-4Diode, the AN push-button switch, the J auxiliary relay, the EC power supply (± 12V), K ₁Exhale/inhale selector switch, K ₂Allow exposure switch, K _3,4The bidirectional analog switch (model: CD4066), among Fig. 2, transport and placing device IC ₃Output link to each other with the input of peak holding circuit 3 and the input of comparator 4 respectively; Resistance R ₈Be parallel to transport and placing device IC ₂Positive and negative input; Resistance R ₉, R ₁₁Be parallel to transport and placing device IC respectively ₃Reach the bidirectional analog K switch between end of oppisite phase and the ground ₃Control end and ground between; Exposure switch K ₂Fixed contact C by trimmer potentiometer W ₄Sliding contact and transport and placing device IC ₃Output links to each other, and another fixed contact D links to each other with ground.

In conjunction with above-mentioned accompanying drawing in detail the utility model course of work is described in detail: the work beginning will allow exposure switch K earlier ₂Put D, click push-button switch AN then and make capacitor C ₄Discharge, probe (negative tempperature coefficient thermistor) one (is selected Rt according to the diagnosis needs ₁Be used for clapping and exhale Rt deeply ₂Clap dark the suction) place place, patient nostril, another probe is placed on same indoor getting final product, and at this moment whole device is in sample phase, after at this moment instructing the patient to do periodic deep breathing, estimating several times breathing time, with exposure switch K ₂Put C, from this moment, in case present breathing surpasses the strongest breathing between sampling period, then monostable interface moves immediately, triggers X line machine exposure (condition that exposure requires is still set by former machine) single exposure and finishes.

Claims

1, a kind of medical x-ray machine is clapped the chest and abdomen film exposure control unit, mainly is made up of amplifier, comparator, it is characterized in that described compensated amplifier 2:

A, differential amplifier IC ₁Output through C ₇With transport and placing device IC _2,3In-phase end link to each other;

B, transport and placing device IC ₂Output with exhale/inhale selector switch K ₁Moving contact links to each other;

C, exhale/inhale selector switch K ₁Fixed contact A and bidirectional analog K switch ₃Control end link this K switch ₃The line at two ends is serially connected with trimmer potentiometer W ₂With transport and placing device IC ₃End of oppisite phase between;

D, exhale/inhale selector switch K ₁Fixed contact B and bidirectional analog K switch ₄Control end link to each other this K switch ₄Two ends line and trimmer potentiometer W ₃After the series connection, with resistance R ₁₀And transport and placing device IC ₃End of oppisite phase and output parallel connection.

2, medical x-ray machine according to claim 1 is clapped chest belly sheet exposure control unit, its feature:

Transport and placing device IC ₃Output link to each other with the output of peak holding circuit 3 and the output of comparator 4 respectively.

3, medical x-ray machine according to claim 1 is clapped chest belly sheet exposure automatic controller, its feature:

A, resistance R ₈Be parallel to transport and placing device IC ₂Positive inverting input;

B, resistance R ₉, R ₁₁Be parallel to transport and placing device IC respectively ₃Between end of oppisite phase and the ground and the bidirectional analog K switch ₃Between control end and the ground.

4, medical x-ray machine according to claim 2 is clapped the chest and abdomen film exposure control unit, its feature:

Allow exposure switch K ₂Moving contact C by adjustable potentiometer W ₄Sliding contact and transport and placing device IC ₃Output links to each other, and another fixed contact D links to each other with ground.