CN208048715U - A kind of sacculus form high frequency device for dynamically detecting - Google Patents

Abstract

The utility model is related to a kind of sacculus form high frequency device for dynamically detecting, including detection probe and detection circuit；Detection probe is a slender conduit, is disposed with N number of annular electro pole piece above；Detection circuit includes MCU processor, and MCU processor generates a constant current square-wave signal, which is transferred to two exciting electrodes of head and the tail of detection probe by excitation signal converter respectively with certain frequency；Output signal converter by between the adjacent electrode in signal acquisition circuit through uniform treated the potential difference signal of signal, it is transferred to that prefilter is filtered, differential amplification, low-pass filtering, high-precision a/d converter convert analog signal to digital signal and be sent to MCU processor successively, finally carries out serial communication according to fixed communication agreement and host computer by MCU processor；Detection circuit can complete the real-time detection of N-1 sacculus section morphology, and frequency is more than 100Hz.

Description

A kind of sacculus form high frequency device for dynamically detecting

Technical field

The utility model is related to a kind of sacculus form high frequency device for dynamically detecting, belong to the field of medical instrument technology.

Background technology

The foley's tube of one of main instrument as intervention diagnosis and therapy, the importance in intervention diagnosis and therapy are self-evident.Doctor Use sacculus as the core of foley's tube, it can generate metamorphosis because external and internal pressure changes during the work time, this It is both the important feature parameter for the important indicator and disease treatment for evaluating sacculus working performance itself.

It has been widely used in urinary system, digestive system etc. to disease progress diagnosis and treatment using sacculus morphological feature parameter to face In bed intracavitary intervention diagnosis and therapy equipment.The clinical means of conventional real-time monitoring sacculus metamorphosis include endo-luminal ultrasound, DR etc. big Type equipment, the quasi-instrument is mostly expensive and complicated, and has certain restrictions to detection environment and cavity material etc., no Conducive to detecting for a long time.

In the prior art, the relevant technologies US7454244B2, US7479120B2 disclose a kind of impedance area measuring method, In sacculus after exuberant physiological saline acquisition sacculus morphological feature can be calculated by measuring different location resistance characteristic.It will be permanent It flows AC sine waves to import in conduction liquid, then measures its chamber by measuring the potential difference variation in the corresponding section of a pair of electrodes acquisition Body section product variation.This to use bipolar electrode, the mode of AC stimulus signals, circuit is complicated, and formula is detected simultaneously making multi-section There are significant impacts with size to probe compliance for excessive core quantity when probe.In addition when cavity size otherness is excessive When, signal difference is larger, and the single amplifying circuit of fixed amplification factor is difficult to meet measurement request.

Utility model content

For deficiencies of the prior art, it is dynamic that the purpose of this utility model is to provide a kind of sacculus form high frequencies State detection device, it is complicated to solve available circuit, measurement accuracy and is limited in scope and is difficult to meet high-resolution measurement request Problem, realize miniaturization, refine and applied to in tube chamber external morphology Medical Devices.

Realize above-mentioned purpose, the utility model adopts the following technical solution：A kind of sacculus form high frequency device for dynamically detecting, Including detection probe and detection circuit；It is characterized in that, detection probe is a slender conduit, it is disposed with N number of annular electro above Pole piece；

Detection circuit includes MCU processor, excitation signal converter, the uniform device of signal, signal acquisition circuit and output letter Number converter；MCU processor generates a constant current square-wave signal（Frequency:1k~10k；Electric current：50~500uA）, the signal is by exciting Signal adapter passes two exciting electrodes of head and the tail for being transferred to detection probe respectively with certain frequency；Output signal converter will be believed Through uniform treated the potential difference signal of signal between adjacent electrode in number Acquisition Circuit, filtered processing, difference are put successively Greatly, low-pass filtering, high-precision a/d converter convert analog signal to digital signal and are sent to MCU processor, finally by MCU Processor carries out serial communication according to fixed communication agreement and host computer；Detection circuit can complete N-1 sacculus section morphology Detection in real time；

Potential difference signal exports after being handled by detection circuit through serial ports between detection probe adjacent electrode piece, then passes through standard Curve calculates the section volume data for obtaining corresponding section.

Further, the annular electro pole piece is flexible electrical pole piece, except two electrodes of head and the tail and adjacent electrode spacing are 1.5 ~ 2 Outside unit spacing, remaining electrode spacing is a unit spacing；The head and the tail electrode is to have arousal function to have detecting function again Electrode slice.

Compared with prior art, the utility model has the following advantages that：

1, the utility model is handled using shared electrode, and detection electrode quantity is greatly reduced, and saves probe space ruler It is very little, provide condition to improve resolution ratio；And the DC signals directly generated using MCU processor, simplify energizing circuit, and Electrode life is increased using excitation signal converter.

2, it replaces bipolar electrode to save bulk and increase resolution ratio using single electrode, replaces AC signals simple with DC signals Change energizing circuit, by the uniform circuit of signal, analog switch technology and adaptive amplifying technique, expands measurement range, extends electricity Pole service life and simplified amplifying circuit, to realize miniaturization, the purpose of precision.

3, with the uniform circuit of unique signal, analog switch technology and adaptive amplifying technique, expand measurement range, letter Change amplifying circuit, can really realize modularization and miniaturization.

The utility model proposes sacculus multi-section form device for dynamically detecting, be suitable for inside the different sap cavity of conductivity Morphology observation, the real-time form high frequency dynamic detection especially suitable for brine sacculus.

Description of the drawings

Fig. 1 the utility model sacculus form high frequency device for dynamically detecting example structure schematic diagrams；

Detection circuit functional block diagram in Fig. 2 the utility model；

Fig. 3 embodiment amplifying circuit schematic diagrams；

Fig. 4 embodiment amplifying circuit fundamental diagrams；

Fig. 5 embodiment detection method flow charts；

The uniform design sketch of Fig. 6 embodiment signals；

Fig. 7 embodiment standard curve diagrams；

The another embodiment device application schematic diagrams of Fig. 8；

The another embodiment device application testing result figures of Fig. 9.

In figure, 1- detection probes, the uniform device of 2- signals, 3- output signal converters, 4- amplifying circuits, 5- excitation signals Converter, 6- high-precision a/d converters and MCU processor, 7- sacculus.

Specific implementation mode

In order to illustrate more clearly of utility model, brief introduction is done to the attached drawing used in embodiment below, it is aobvious and easy Insight, the accompanying drawings in the following description are only some embodiments of the utility model, for those of ordinary skill in the art, Under the premise of not making the creative labor, other accompanying drawings are can also be obtained according to these attached drawings.

A very simple electrical principles are utilized according to Ohm's law in impedance area measuring method, by measuring resistance Resist and carrys out technology cross-sectional area.Each channel that impedance is surveyed in plane system includes to stimulate part and signal processing two parts, Moderate stimulation part is made of sine-wave generator and alternating current generator, and signal processing is then by amplifier, rectifier It is constituted with several parts of filter.Sine-wave generator generates low harmonic distortion sine voltage, and signal is fed back to alternation electricity In flow-generator, and then it is converted into constant alternating current.This electric current is respectively input on two stimulating electrodes, and in two electricity Interpolar generates electric field.Current potential between two detection electrodes is amplified, filters, A/D is converted, and is finally transported in host computer.It is this to make With bipolar electrode, the mode of AC stimulus signals, circuit is complicated, the excessive core quantity when making multi-section and detecting formula probe simultaneously To probe compliance, there are significant impacts with size.In addition when cavity size otherness is excessive, signal difference is larger, fixed The single amplifying circuit of amplification factor is difficult to meet measurement request.

For the above technical problem, the utility model uses single electrode to replace bipolar electrode to save bulk and increase point Resolution replaces AC signals to simplify energizing circuit with DC signals, is expanded by the uniform circuit of signal and analog switch technology and measures model It encloses, extend electrode life and simplify amplifying circuit, to realize miniaturization, the purpose of precision.

With reference to figure 1, a kind of typical structure of sacculus form high frequency device for dynamically detecting of the utility model, by detection probe 1 It is formed with detection circuit.Detection probe 1 is a slender conduit（1 ~ 8mm of diameter, length>4cm）, it is disposed with 9 annulars above Electrode slice, except two electrodes of head and the tail and adjacent electrode spacing are 1.5 ~ 2 unit spacing（Unit cross-sectional area is 2 ~ 10mm）Outside, remaining Electrode spacing is a unit spacing, can complete the conductive sap cavity Morphology observation in 8 sections.Detection circuit includes excitation electricity Road, the uniform circuit 2 of signal, signal acquisition circuit, excitation signal converter 3, output signal converter, prefilter, difference Amplifying circuit 4, low-pass filter, high-precision A/D convert 6 devices and MCU processor.

Detection circuit operation principle（Such as Fig. 2）：MCU processor generates a constant current square-wave signal（Frequency:1k~10k；Electric current： 50~500uA）, the signal is by excitation signal converter with certain frequency（10~100Hz）It is transferred to two excitation electricity of head and the tail respectively Pole.For all annular electro pole pieces all with the capacitor in parallel in the uniform circuit of signal, the uniform circuit of the signal is several resistance strings Connection.Output signal converter（Output signal converter is made of several groups signal adapter, and every group of signal adapter includes two Multiplexer.）Potential difference signal between adjacent electrode in signal acquisition circuit is transferred to prefilter successively to carry out It is filtered, then carries out differential amplification, amplified voltage signal is turned after low-pass filtering treatment by high-precision A/D Parallel operation converts analog signal to digital signal and is sent to MCU processor, finally by MCU processor according to fixed communication agreement with Host computer carries out serial communication.

Fig. 3 is amplifying circuit embodiment schematic diagram, and embodiment is that a section sacculus form captures system, and R10 uses number Word potentiometer can realize that amplification factor adaptively adjusts by program dynamic adjustment amplification factor using closed control circuit.It is real Apply an operation principle（Such as Fig. 4）：The value of digital regulation resistance R10 is exported by MCU and is controlled, amplifier magnification ratio=R13/R10, just It is maximum value that R10 is arranged under beginning state.When conduit is in the minimum sandards tube chamber of target range, acquisition is current in real time by MCU Amplifier output voltage value AN0, with setting target voltage values AP（Maximum voltage value）And AE（Fault-tolerant voltage value）It compares, such as AN0>AE, then MCU controls improve digital regulation resistance value, reduce amplification factor；Such as AP<AN0<AE then retains Contemporary Digital current potential Device value.Switch 8 paths, recycle above-mentioned steps, obtains 8 digital potential values, retain maximum value as end value.Using adaptive Control mode should be amplified, it is ensured that under different measuring conditions（Such as salt water solubility, measurement range）, device can obtain high score Resolution output signal, to improve measurement accuracy.

Application process flow such as Fig. 5 collects the target conductance liquid in sap cavity to be measured, then according to performance to close first Several nominal diameter points are selected on the basis of the measurement range of reason（>3）, target conduction liquid is poured into cavity, and detection is visited Head is inserted into cavity, and the resistor resistance value in the uniform circuit of Regulate signal is to ensure the signal acquired by detection electrode in system It can be in process range（Such as Fig. 6）, the calibration value in each section is read, respective standard curve is obtained by fitting（Such as Fig. 7）.It will visit Probing head is inserted into the cavity to be measured containing target conduction liquid, reads the real-time electrical potential difference signal that each adjacent electrode corresponds to section, It is calculated by standard curve and obtains section morphology characteristic parameter.Signal sampling frequencies can reach 100Hz or more, therefore work as cavity shape When state changes, system can complete the high frequency dynamic detection to the metamorphosis.

Sacculus forces out experiment as one of important diagnosis and treatment means of anorectal disease, is that sacculus is placed in subject's rectum pot Abdomen injects warm water 50ml, advises the defecation posture that subject takes custom that sacculus is discharged as early as possible, help to judge rectum and basin bottom The dysfunction of flesh, evaluation index are subject's efflux time.But the technology cannot provide morphological data, if you need to obtain phase Closing data then needs ultrasound and defecation in progress anus to shine shadow.Fig. 8 and Fig. 9 is a kind of anus made using the utility model technology Door sphincter Morphology observation conduit, conduit diameter 5mm, its exterior is equipped with a 10cm long sacculus, maximum exuberant a diameter of 40mm.It leads 19 detection electrodes are disposed on pipe, the high speed dynamic that can be completed at the same time 18 sacculus changes of section captures, at host computer It can get the real-time morphological Simulation figure of sacculus after reason, morphologic basis provided for anorectal function evaluation.

Finally illustrate, above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng The utility model is described in detail according to preferred embodiment, it will be understood by those of ordinary skill in the art that, it can be to this The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model It encloses, should all cover in the right of the utility model.

Claims (5)

1. a kind of sacculus form high frequency device for dynamically detecting, including detection probe and detection circuit；It is characterized in that, detection probe It is a slender conduit, is disposed with N number of annular electro pole piece above；

Detection circuit includes that MCU processor, excitation signal converter, the uniform device of signal, signal acquisition circuit and output signal turn Parallel operation；MCU processor generates a constant current square-wave signal, which is passed by excitation signal converter and be transferred to respectively with certain frequency Two exciting electrodes of head and the tail of detection probe；Output signal converter will be equal through signal between the adjacent electrode in signal acquisition circuit One treated potential difference signal, filtered processing, differential amplification, low-pass filtering, high-precision a/d converter will simulate successively Signal is converted into digital signal and is sent to MCU processor, is finally carried out according to fixed communication agreement and host computer by MCU processor Serial communication；Detection circuit can complete the real-time detection of N-1 sacculus section morphology；

Potential difference signal exports after being handled by detection circuit through serial ports between detection probe adjacent electrode piece, then passes through standard curve Calculate the section volume data for obtaining corresponding section.

2. sacculus form high frequency device for dynamically detecting according to claim 1, which is characterized in that the annular electro pole piece is soft Property electrode slice, in addition to head and the tail two electrodes and adjacent electrode spacing are 1.5 ~ 2 unit spacing, remaining electrode spacing is a list Column pitch；Two electrode of the head and the tail is to have arousal function again to have the electrode slice of detecting function.

3. sacculus form high frequency device for dynamically detecting according to claim 1, which is characterized in that the annular electro pole piece and letter Capacitor in parallel in number uniform device；The uniform device of signal is that several resistance are composed in series, and resistor is adjustable resistor.

4. sacculus form high frequency device for dynamically detecting according to claim 1, which is characterized in that the output signal converter It is made of several groups signal adapter, every group of signal adapter includes two multiplexers.

5. sacculus form high frequency device for dynamically detecting according to claim 1, which is characterized in that the differential amplification is by amplifying Circuit is completed, which is closed control circuit, and amplification factor can be adjusted adaptively.