CN209474619U - Lung function instrument with shake and angle detecting and and its sensor handle - Google Patents

Abstract

The utility model provides a kind of lung function instrument and its sensor handle, including differential pressure pickup, master control borad and 3-axis acceleration sensor, during pulmonary function test (pft), the sensor handle can effectively judge whether handle is located at test orientation, and detect the jitter conditions of sensor handle, to ensure that the test baseline of lung function instrument is accurate, detection error is reduced.Therefore the lung function instrument of band shake described in the utility model and angle detecting function has high application value.

Description

Lung function instrument with shake and angle detecting and and its sensor handle

Technical field

The utility model relates to medical instruments fields, in particular to shake and the lung function instrument of angle detecting and mating Sensor handle.

Background technique

In recent years, develop in pulmonary function detection field and portable hand-held lung function instrument occur.Main measurement With analysis lung capacity, the parameters such as maximal breathing capacity, facilitate bronchial asthma, Chronic Obstructive Pulmonary Disease, chronic cough Etc. the diagnosis, disease classification and curative effect judgement and surgical risk assessment etc. of common respiratory disease, it can be used for community Hospital, the physical examination of school or various big hospital, epidemiological survey, ward bedside inspection and household etc..

The critical component of hand-held electronic lung function instrument changes first is that being used to detect throughput in expiration or breathing process Differential pressure pickup.Silicon materials are generallyd use at present as differential pressure pickup, and working principle is that (elasticity is sensitive in silicon elastic film piece Element) on form the equal diffusion resistance of multiple resistance values, form a resistance bridge, pass through pellosil deformation generate resistance value Variation, to obtain relevant parameter needed for measurement.But the position-sensitivity of this kind of differential pressure pickup is very high.Due to silica gel Film itself has gravity, when the larger position in the handshaking or handle deviation test position that tester holds lung function instrument handle, silica gel Film will deformation occurs.Test front sensor vibration or direction change, can cause differential pressure pickup judge by accident and mistakenly to Pulmonary function test (pft) result out.Or the change of the vibration or direction before this test, it can be caused very big by as test baseline Test error.

How the detection accuracy of lung function instrument using this kind of differential pressure pickup is improved, it has also become current urgently to be solved Problem.

In the market mainstream lung function instrument be based on differential pressure flowmeter principle, differential pressure flowmeter have accuracy it is high, by The advantages that ambient temperature effect is small, and the service life is long, differential pressure flowmeter include flow transmitter and differential pressure pickup two parts, flow Transmitter realizes the linear transformation of gas flow rate and pressure difference, transmitter of different sizes according to the air velocity for flowing through the transmitter Both ends generate corresponding pressure difference, i.e. pressure difference signal, generally use throttle pipe, orifice plate, sieve etc.；Differential pressure pickup again will be with stream Amount has the pressure difference signal of certain relationship to be converted into electric signal, is converted into digital signal after processing, is finally calculated by microprocessor Show various lung function parameters and curve.Such as Chinese patent 201720594878.1,201710538777.7, 201710705110.1 describing the lung function instrument with throttle pipe and differential pressure pickup.

Pressure difference sensor generallys use silicon piezo resistive technology, and integrated pressure effector and laser accurately correct on silicon wafer Film resistor network, when there is pressure difference on effector two sides, effector can generate miniature deformation, cause the impedance phase of resistor network It should change, to realize pressure differential detection.But effector is influenced by gravity, different directions place effector itself and have difference Subtle deformation can also cause resistor network impedance variations although very small, so differential pressure pickup contraposition is equipped with sensitivity Property, mobile or shake can all lead to impedance output variation, subtract as far as possible although many differential pressure pickup manufacturers use various technologies Small position sensing, such as with technologies such as two groups of synistor network building outs, but cannot be completely eliminated position sensing.Pressure difference Formula sensor is typically mounted in lung function instrument sensor handle.For large-scale lung function instrument, sensor handle is fixed on bracket On, the position of differential pressure pickup also immobilizes, and the position sensing problem of differential pressure pickup does not influence detection accuracy.But for hand Formula lung function instrument is held, differential pressure pickup has movement in the detection process, changes sensor orientation, the various situations such as shake, institute With portable lung function instrument usually zero point detection and normal exhalation detection when, it is desirable that keep sensor orientation and test when direction Unanimously, and it is stationary as far as possible.These requirements can solve most of problem, but exist much due to the biography in detection process The phenomenon that reasons such as sensor poor direction or shake cause detection data that pulmonary function test Quality Control requirement is not achieved, it has to increase It aggravates reinspection and surveys number, that is, waste time, multiple forced expiration detection keeps patient more tired out again.

Utility model content

To overcome the above disadvantages, one of the purpose of this utility model is to provide a kind of sensor hand for lung function instrument Handle, including differential pressure pickup, master control borad and 3-axis acceleration sensor, 3-axis acceleration sensor and differential pressure pickup are mounted on On master control borad, and it is connect respectively with microprocessor.Shaking and direction of the 3-axis acceleration sensor for detection sensor handle Inclination angle.

Further, sensor handle includes upper cover and lower cover, and upper cover and lower cover are assembled to each other to be formed in one Chamber, it is described to be mounted with 3-axis acceleration sensor and the master control borad of differential pressure pickup is mounted in the inner cavity of sensor handle.

Further, signal conditioning circuit and A/D conversion circuit are additionally provided on master control borad.

Further, differential pressure pickup output pressure difference signal is converted into counting by signal conditioning circuit, A/D conversion circuit Word signal is connect by serial peripheral interface bus with microprocessor circuit, and 3-axis acceleration sensor exports tri- axis of xyz and accelerates Degree digital signal is connect by serial peripheral interface bus with microprocessor circuit.

The utility model additionally provides a kind of lung function instrument, including flow transmitter, differential pressure pickup, microprocessor, biography Sensor handle and 3-axis acceleration sensor, 3-axis acceleration sensor are installed in the handle.

Wherein, 3-axis acceleration sensor and differential pressure pickup are fixed on master control borad, and are connect respectively with microprocessor.

Further, flow transmitter is selected from throttle pipe.

The utility model additionally provides the lung function parameter test macro with shake and angle detecting, including pressure difference sensing Device, signal conditioning circuit, A/D conversion circuit, microprocessor circuit, 3-axis acceleration sensor and electric power management circuit.Pressure difference Sensor exports pressure difference signal and is converted into digital signal and microprocessor circuit company by signal conditioning circuit, A/D conversion circuit It connects, 3-axis acceleration sensor output xyz 3-axis acceleration digital signal is connect with microprocessor circuit, electric power management circuit point It is not connect with signal conditioning circuit, A/D conversion circuit, microprocessor circuit, 3-axis acceleration sensor.

Further, A/D conversion circuit is converted into digital signal and is connect with microprocessor circuit by spi bus.

Further, 3-axis acceleration sensor output xyz 3-axis acceleration digital signal passes through spi bus and micro process Device circuit connection.

The 3-axis acceleration sensor can experience acceleration and be converted into the sensor of usable output signal.Three axis accelerate Degree sensor can detecte the variation at inclination angle up and down, with vibration/shaking width of acceleration transducer detection handheld device Degree, can accurately reflect the kinetic property of object comprehensively.The differential pressure pickup is selected from piezo-resistive silicon pressure sensor.

It is described in the utility model to be the advantages of being mounted with 3-axis acceleration sensor on hand-held lung function instrument: (1) may be used Timely and effectively judge whether the handle with differential pressure pickup is located at test position, it is improper to reduce differential pressure pickup pellosil Deformation bring detection error.(2) in test process, the handshaking situation of tester is detected, if judging, shake is very big, It can stop detecting immediately, ensure that the stability of baseline, the measurement accuracy of guarantee.

Detailed description of the invention

Tri- axis direction acceleration schematic diagram of Fig. 1 3-axis acceleration sensor corresponding x, y, z；

Fig. 2 is equipped with the structural schematic diagram of the wherein one side of the master control borad of differential pressure pickup and 3-axis acceleration sensor；

Fig. 3 is equipped with the structural schematic diagram of the another side of the master control borad of differential pressure pickup and 3-axis acceleration sensor；

Fig. 4 circuit line frame graph；

Fig. 5 is shaken using three-axis sensor detection sensor handle and the test process line frame graph in direction；

The first lung function instrument schematic diagram with three-axis sensor of Fig. 6；

Second of Fig. 7 lung function instrument schematic diagram with three-axis sensor；

The V-T time volume curve diagram and F-T time-discharge curve figure of control group in Fig. 8 embodiment 1；

The V-T time volume curve diagram and F-T time-discharge curve figure of experimental group in Fig. 9 embodiment 1；

The V-T time volume curve diagram and F-T time-discharge curve figure of control group in Figure 10 embodiment 2；

The V-T time volume curve diagram and F-T time-discharge curve figure of experimental group in Figure 11 embodiment 2.

Specific embodiment

Hand-held lung function instrument includes differential pressure flowmeter, microprocessor and sensor handle, is installed in sensor handle There is 3-axis acceleration sensor.Differential pressure flowmeter includes flow transmitter and differential pressure pickup.Flow transmitter can be selected from throttling Pipe, orifice plate, sieve etc. realize the linear transformation of gas flow rate and pressure difference, according to the air velocity size for flowing through the transmitter Difference, transmitter both ends generate corresponding pressure difference, i.e., have the pressure difference signal of certain relationship with flow.Differential pressure pickup again will pressure Difference signal is converted into electric signal, and is converted into digital signal.Microprocessor, which calculates, shows various lung function parameters and curve.

The 3-axis acceleration sensor is used to shaking and the direction inclination angle of detection sensor handle, to examine to zero point It surveys and the sensor handle state of expiration detection process is judged, if sensor handle orientations are incorrect or have shake, Stop detecting and simultaneously prompts to keep correct direction, it is stationary as far as possible, it just can be carried out detection when in the right direction and static.In this way It is possible to prevente effectively from operational mistake causes invalid detection, detection efficiency is substantially increased.

3-axis acceleration sensor as shown in Figure 1, when 3-axis acceleration sensor is in moving condition, corresponding x, y, Tri- axis direction of z has acceleration value variation；When 3-axis acceleration sensor remains static, what is applied thereon is only heavy Power, the acceleration output of three axis are acceleration of gravity respectively in the component of three axial directions.3-axis acceleration sensor is sensing Position is fixed on device handle, when handle be in some direction it is static when, the acceleration output of three axis is that direction gravity adds Speed is respectively in the component of three axial directions, and when handle orientations change, acceleration of gravity also has in the component of three axial directions to be changed Become, therefore may determine that the direction position of handle and the shaking situation of handle.

The shaking detection characteristic value of handle is adjacent moment acceleration difference absolute value, represents the variation of adjacent moment acceleration Rate.The acceleration value at current time and the absolute value of the acceleration value difference of last moment are obtained, if preset continuous When being greater than dithering threshold in number, then determine that handle has shake；When if it is less than dithering threshold, then determine that handle is static.More In specific example, the acceleration value in tri- directions xyz is taken, the variable quantity of these three directional acceleration values of adjacent moment is compared, If the acceleration difference in one or more directions is more than threshold value, illustrate that handle has shake.

Handle orientations position detection characteristic value is 3-axis acceleration component value, represents the angle of three axis directions and gravity direction Size, angle is smaller, and output component of acceleration is bigger.When handle is in different directions, point of the gravity in tri- directions xyz It measures different.Obtain current 3-axis acceleration component value, if any one component value be greater than in preset read-around ratio or When less than direction threshold range, then determine that handle orientations are incorrect；If meeting direction threshold range, determine handle orientations just Really.

The default read-around ratio can be several times, such as continuous ten times, can also be with other numbers.

In design scheme as shown in Figures 2 and 3,3-axis acceleration sensor 1 and differential pressure pickup 2 are mounted on master control borad On 3, and it is connect respectively with microprocessor circuit 91.The master control borad 3 is mounted in the sensor handle of lung function instrument.Throttle pipe It is plugged on attachment base 4 and is connect by gas-guide tube 5 with differential pressure pickup, realize the linear transformation of gas flow rate and pressure difference, root Of different sizes according to the air velocity for flowing through throttle pipe, throttle pipe both ends generate corresponding pressure difference, form pressure difference signal.Pressure difference passes The pressure difference signal for having certain relationship with flow is converted into electric signal by sensor, is converted into digital signal after processing, and by micro- It manages device and calculates the various lung function data of display.According to the difference of throttle pipe, the number of differential pressure pickup is unlimited.Such as pressure difference sensing Device can be two of one or as shown in Figure 2.A/D conversion circuit 92 and signal conditioning circuit 93 are also equipped on master control borad.

Fig. 4 is the associated circuit theory line frame graph of sensor, including differential pressure pickup, signal conditioning circuit, A/D are converted Circuit, microprocessor circuit, 3-axis acceleration sensor and electric power management circuit.When unlatching power supply starts pulmonary function detection, Tested people blows into flow transmitter, and the signal that differential pressure pickup measures is sent after digital-to-analogue conversion to micro process by amplification Device.The signal that 3-axis acceleration sensor measures simultaneously is sent to microprocessor, to provide the shaking of sensor handle and direction The data parameters of inclination angle situation.

Test process line frame graph as shown in connection with fig. 5 further illustrates and judges sensor hand using three axis acceleration sensors A kind of method of handle direction position and jitter conditions, comprising the following steps: (1) 3-axis acceleration being installed in sensor handle Sensor electrification reset.(2) 3-axis acceleration value is initialized.(3) the 3-axis acceleration value at current time is obtained.(4) three are calculated The absolute value of axle acceleration value and upper adjacent moment acceleration value difference.(5) by the absolute difference with preset Dithering threshold compare.If more than dithering threshold, then further judge in preset read-around ratio (such as continuous ten times), it is poor It is worth whether absolute value is both greater than dithering threshold, if it is not, step 3 is then turned again to, if so, being judged as that handle is shaken.If small In dithering threshold, then judge that handle is static.(6) when judging that handle is static, calculate acceleration component values, and by component value with Preset angle threshold range compares.If component value judges handle orientations without departing from preset angle threshold Correctly.If component value exceeds angle threshold range, (such as continuous ten times) are further judged in preset read-around ratio, Whether component value is more than angle threshold range, if it is not, step 3 is turned again to, if so, judging that handle orientations are incorrect.

Sensor handle is excessively sensitive for shake and incorrect direction in order to prevent, increases during the test In preset read-around ratio, whether absolute difference be both greater than dithering threshold or component value more than angle threshold range Step.According to the situation of system entirety, this is a selectable step.

Lung function parameter test macro with shake and angle detecting, including differential pressure pickup, signal conditioning circuit, A/D Conversion circuit, microprocessor circuit, 3-axis acceleration sensor and electric power management circuit.It is logical that differential pressure pickup exports pressure difference signal Cross signal conditioning circuit, A/D conversion circuit is converted into digital signal, pass through Serial Peripheral Interface (SPI) (Serial Peripheral Interface, SPI) bus connect with microprocessor circuit, and 3-axis acceleration sensor exports xyz 3-axis acceleration number letter Number connect with microprocessor circuit by spi bus, electric power management circuit respectively with signal conditioning circuit, A/D conversion circuit, micro- Processor circuit, 3-axis acceleration sensor connection.

The hand-held lung function instrument of sensor handle, including sensor handle 6, throttle pipe are had as shown in Fig. 2,3 and 6 7 and host 8.Sensor handle 6 includes upper cover 61 and lower cover 62, and upper cover and lower cover mutually snap together to form an inner cavity, The master control borad 3 for being mounted with 3-axis acceleration sensor 1 and differential pressure pickup 2 is mounted in the inner cavity of sensor handle.Sensor The top of handle is connect with 4 bottom of throttle pipe attachment base.In embodiment as shown in Figures 2 and 3, attachment base 4 is equipped with and throttling The hole post jack 41 of the pressure hole post cooperation of pipe, is equipped with air guide interface tube 42 on hole post jack.One end of gas-guide tube and air guide Interface tube connection.The other end is connect with differential pressure pickup.In use, throttle pipe 7 is mounted on throttle pipe attachment base 4, and pass through Gas-guide tube is connect with differential pressure pickup, realizes the linear transformation of gas flow rate and pressure difference.On host 8 it is mountable have data storage and Output system, such as memory, display screen 81, audio frequency apparatus etc..Sensor handle will test data by data transmission system It is transmitted on host, data transmission system can be selected from the modes such as data line, Bluetooth transmission.

Pressure hole post there are three setting on throttle pipe, is that low pressure pressure hole post, the first high pressure pressure hole post and second are high respectively The hand-held lung function instrument of pressure hole post is pressed, attachment base is also set accordingly there are three hole post jack.Is arranged on master control borad One differential pressure pickup, the second differential pressure pickup and 3-axis acceleration sensor.After throttle pipe is inserted into throttle pipe attachment base, first is high Pressure hole post is pressed to pass through the positive press bond of gas-guide tube 5 and the first differential pressure pickup, the second high pressure pressure hole post passes through gas-guide tube 5 With the positive press bond of the second differential pressure pickup, the low-pressure ends of two differential pressure pickups by tee tube 43 respectively with low pressure pressure Hole post connection.

Another hand-held lung function instrument with sensor handle as shown in Figure 7, the biography including having display screen 81 Sensor handle 6 and throttle pipe 7.It is mounted with the master control borad installation sensor handle of 3-axis acceleration sensor and differential pressure pickup It is interior, it further include microprocessor in sensor handle.Throttle pipe 7 is mounted on sensor handle, and is passed by gas-guide tube and pressure difference Sensor connection.Throttle pipe includes a high pressure pressure hole post and a low pressure pressure hole post, and the hole post jack of attachment base is also therewith Hole post jack there are two setting accordingly.

The method for measuring lung function parameter using the lung function instrument described in the utility model with 3-axis acceleration sensor, The following steps are included:

(1) a kind of hand-held lung function instrument is provided, the lung function instrument includes that differential pressure flowmeter, microprocessor and three axis add Velocity sensor, differential pressure flowmeter include flow transmitter and differential pressure pickup, 3-axis acceleration sensor and differential pressure pickup It is installed in sensor handle.

(2) testee exhales against flow transmitter (such as throttle pipe).

(3) direction position and the jitter conditions of sensor handle are judged using 3-axis acceleration sensor and preceding method, If judging, sensor handle is in dither state and/or handle orientations not in test position, provides signal prompt, or directly stop Only detection (such as stopping detecting and prompting to keep correct direction, stationary as far as possible)；If judging, handle is located at correctly detection Position and state then detect continuation.

(4) when judging that handle is located at correctly detection position and does not shake, differential pressure pickup will have certain pass with flow The pressure difference signal of system is converted into electric signal, is converted into digital signal after processing, is finally calculated by microprocessor and shows various lungs Functional parameter and curve.

Embodiment 1

Using the hand-held lung function instrument (experimental group) described in the utility model for opening 3-axis acceleration sensor and close Forced vital capacity (the forced vital of lung function instrument (control group) the detection testee of 3-axis acceleration sensor Capacity, FVC).The lung function instrument of experimental group and control group other than 3-axis acceleration sensor unlatching/closing, other It is identical.Contrived experiment process is that sensor handle has shake before the end, and the practical FVC value of experimental design is 1.74L.

Experimental result is as shown in FIG. 8 and 9, since sensor handle is shaken, differential pressure pickup offset output is caused to fluctuate.It is right It is 1.80L according to the FVC value that group measures, it is bigger than normal compared to actual FVC testing result.The FVC value 1.74L that experimental group measures, with Actual FVC is consistent.The experimental results showed that since control group is not turned on acceleration transducer, it can not be to handle jitter conditions It judges, causes control group FVC detection bigger than normal, provide error result.And 3-axis acceleration sensor is opened in experimental group The step of detecting handle jitter conditions effectively judges the case where handle is shaken, avoids error detection, provide accurate result.

Embodiment 2

Using the hand-held lung function instrument (experimental group) described in the utility model for opening 3-axis acceleration sensor and close The forced vital capacity (FVC) of lung function instrument (control group) the detection testee of 3-axis acceleration sensor.Experimental group and control The lung function instrument of group is other same other than 3-axis acceleration sensor unlatching/closing.Contrived experiment process is before the end Handle orientations change, and the practical FVC value of experimental design is 3.19L.

Experimental result is as shown in FIG. 10 and 11, since handle orientations change, differential pressure pickup offset output is caused to become larger.It is right It is bigger than normal compared to actual FVC testing result according to the FVC value 3.65L that group measures.The FVC value that experimental group measures is 3.19L, with Actual FVC is consistent.The experimental results showed that since control group is not turned on 3-axis acceleration sensor, it can not be to handle orientations Change situation to judge, control group FVC is caused to detect bigger than normal, the result mistake provided.And unlatching three is increased in experimental group Axle acceleration sensor detects the step of handle orientations change situation, effectively judges that handle orientations change, and avoid mistake Detection, the accurate result provided.

Claims (8)

1. a kind of sensor handle for lung function instrument, including differential pressure pickup and master control borad, which is characterized in that further include using In the shaking of detection sensor handle and the 3-axis acceleration sensor at direction inclination angle, 3-axis acceleration sensor and pressure difference sensing Device is mounted on master control borad, and is connect respectively with microprocessor.

2. sensor handle according to claim 1, which is characterized in that sensor handle includes upper cover and lower cover, upper cover It is assembled to each other to form an inner cavity with lower cover, the master control for being mounted with 3-axis acceleration sensor and differential pressure pickup Plate is installed in the lumen.

3. sensor handle according to claim 1, which is characterized in that be additionally provided with signal conditioning circuit and A/ on master control borad D conversion circuit.

4. sensor handle according to claim 3, which is characterized in that differential pressure pickup output pressure difference signal passes through signal Conditioning circuit, A/D conversion circuit are converted into digital signal, are connect by serial peripheral interface bus with microprocessor circuit, three Axle acceleration sensor exports xyz 3-axis acceleration digital signal and is connected by serial peripheral interface bus and microprocessor circuit It connects.

5. a kind of lung function instrument, including flow transmitter, differential pressure pickup, microprocessor and sensor handle, which is characterized in that It further include the 3-axis acceleration sensor of the shaking and direction inclination angle for detection sensor handle, 3-axis acceleration sensor peace Dress is in the handle.

6. lung function instrument according to claim 5, which is characterized in that 3-axis acceleration sensor and differential pressure pickup installation It is connect on master control borad, and respectively with microprocessor, the master control borad is mounted in sensor handle.

7. lung function instrument according to claim 5, which is characterized in that the flow transmitter is throttle pipe.

8. lung function instrument according to claim 7, which is characterized in that throttle pipe is connected by gas-guide tube and differential pressure pickup It connects.