CN104510502A - Wireless handheld bladder scanner - Google Patents

Abstract

The invention discloses a wireless handheld bladder scanner. The wireless handheld bladder scanner comprises a wireless ultrasonic probe and a tablet personal computer or a smart phone; the wireless ultrasonic probe is formed by sequentially connecting an ultrasonic array element, a waveform emission controller, a motor driving device, a signal amplifier, an AD sampler, a main controller and a wireless transmission module. The wireless handheld bladder scanner has the characteristics that the volume of urine in bladder can be accurately calculated, and a user can operate conveniently; the wireless handheld bladder scanner is suitable for popularization and application.

Description

A kind of wireless handheld bladder scanner

Technical field

The invention belongs to technical field of medical instruments, relate to a kind of wireless handheld bladder scanner.

Background technology

The remaining urine of patient's bladder number have influence on the infection of urinary system and the exception of renal function, this is for many years for the project that the impaired sufferer nursing of spinal cord injury sufferer, pelvic cavity Post operation or other nervi vesicales inferioreses must be noted that.At present, domestic and international expert unanimously thinks that intermittent urethral catheterization is the prefered method of neurogenic bladder dysfunction process.Desirable intermittent urethral catheterization based on bladder urine capacity, namely within the scope of the safe capacity of patient, should reach maximum bladder capacity as far as possible.Traditional method majority adopts percussion, but poor accuracy, has uncertainty, blindness, and has very large relation with the experience of doctor, patient sign.So bladder scanner is as the inspection apparatus of Noninvasive, the patient of paruria is provided to the high accuracy inspection of Noninvasive, avoiding the urine retention pathological changes that unnecessary urethral catheterization or carelessness urethral catheterization cause, is very important checkout facility.

Existing bladder scanner implementation generally comprises two parts, ultrasonic probe and main frame.Ultrasonic probe realizes scanning the 3 D stereo of bladder, and the signal that host machine part realizes ultrasonic probe obtains amplifies, and AD samples, and imaging and Bladder Volume calculate, the functions such as user operation control.Between ultrasonic probe and main frame, cable is adopted to connect.

In existing bladder scanner actualizing technology, adopt cable to connect, the amplification of signal between ultrasonic probe and main frame, the process such as AD sampling all complete in host side.And the ultrasound echo signal that ultrasonic probe collects very faint (microvolt rank), so faint analogue signal by cable transmission to main frame (general 1 meter to 1.5 meters of length of cable), be very easy to the electromagnetic interference be subject in external environment condition, and the interference of the motor control signal simultaneously to transmit in company with this cable, so that have influence on ultrasonic image quality, finally have influence on the accuracy that Bladder Volume measures.The existence of this connection cord simultaneously makes user in use be restricted, and ultrasonic probe and main frame can not arbitrarily movements, are subject to length of cable restriction.

Summary of the invention

The object of the invention is to the defect overcoming the existence of above-mentioned technology, a kind of wireless handheld bladder scanner is provided, the amplification of ultrasonic signal, AD sampling and circuit for controlling motor are put into ultrasonic probe end; And the ultrasonic digital signal after AD conversion, more wirelessly (Wi-Fi or bluetooth) is transferred to panel computer or smart mobile phone; Panel computer or smart mobile phone complete the process of ultrasonic digital signal, imaging, border detection, volume computing and the function such as display and user operation.The long-distance cable so both having solved ultrasonic faint analogue signal transmits the interference brought, image and the bladder cubing more accurately of more high s/n ratio can be obtained, the operation inconvenience that the connection cord solving again main frame and ultrasonic probe brings, user-friendly.

Its concrete technical scheme is:

A kind of wireless handheld bladder scanner, comprise wireless ultrasound probe and panel computer or smart mobile phone, described wireless ultrasound probe is connected in sequence by ultrasound element, waveform mission controller, motor vertical driver, horizontal motor driver, high pass filter, signal amplifier, band filter, a/d converter, master controller, wireless transport module.

Preferably, described wireless transport module is wifi or bluetooth radio module.

Master controller carries out waveform emission control, encourages suitable transmitted waveform to ultrasound element.

Master controller controls motor vertical driver and horizontal motor driver simultaneously, and drive ultrasound element completes N number of (being generally 12) the tangent plane scanning imagery to Bladder Volume.

The weak echo signal of ultrasound element through high pass filter, the low-frequency disturbance in filtering echo-signal.

Signal amplifier amplifies the ultrasound echo signal after high-pass filtering.

Band filter carries out filtering to the signal beyond ultrasonic signal effective frequency range, produces signal aliasing to prevent AD conversion.

A/d converter carries out digitized conversion to simulation ultrasound echo signal.In order to avoid the digital signal samples frequency using nyquist sampling theorem to obtain is higher, the present invention uses bandpass sampling mode to reduce sample frequency.Lower data signal rate can be obtained like this, be conducive to wireless transmission.

Master controller receives the digital signal of ultrasonic echo, carries out packing combination, then by wireless transport module, be transferred to panel computer or smart mobile phone to data.

Panel computer or smart mobile phone pass through wifi or bluetooth module, receives ultrasonic echo data, then carry out signal processing, imaging, bladder border detection, finally calculate the volume of bladder, and be presented on panel computer or smart mobile phone screen.

Compared with prior art, beneficial effect of the present invention is:

Because signal amplifier, AD sampler have all been placed on inside ultrasonic probe, very near with the distance of ultrasound element, avoid faint ultrasonic echo analogue signal through the signal disturbing caused by Long line transmission, can obtain the ultrasonoscopy that signal to noise ratio is higher, this is the prerequisite of accurate Calculation bladder urine volume.

Meanwhile, between ultrasonic probe and panel computer/smart mobile phone, adopt wireless connections, avoid the connection cord between other traditional bladder scanner probe and main frames, facilitate the operation of user.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of wireless handheld bladder scanner;

Fig. 2 is three rank high pass filter schematic diagrams;

Fig. 3 is high-pass filtering front signal waveform;

Fig. 4 is signal waveform after high-pass filtering;

Fig. 5 is that five rank bands lead to difference filter schematic diagram;

Fig. 6 is bladder volume estimation schematic diagram.Wherein Fig. 6 a is that function f (x) rotates formation rotary body schematic diagram around y-axis, and Fig. 6 b obtains equally distributed bladder profile schematic diagram by filtering and interpolation after scan conversion, and Fig. 6 c is swept-volume schematic diagram, corresponding rotation angle.

Detailed description of the invention

The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with the drawings and specific embodiments, setting forth the present invention further.

A kind of wireless handheld bladder scanner, comprise wireless ultrasound probe and panel computer or smart mobile phone, described wireless ultrasound probe is connected in sequence by ultrasound element, waveform mission controller, motor vertical driver, horizontal motor driver, high pass filter, signal amplifier, band filter, a/d converter, master controller, wireless transport module.Described wireless transport module is wifi or bluetooth radio module.

Master controller carries out waveform emission control, encourages suitable transmitted waveform to ultrasound element.

Master controller controls motor vertical driver and horizontal motor driver simultaneously, and drive ultrasound element completes N number of (being generally 12) the tangent plane scanning imagery to Bladder Volume.

The weak echo signal of ultrasound element is through high pass filter, and the low-frequency disturbance that filtering transmitted waveform is superimposed upon in echo-signal due to the inductive energy storage effect of coupling transformer, prevents this low-frequency disturbance from causing signal saturated to follow-up signal amplifier.This wave filter adopts 3 rank LC design of filters, as shown in Figure 2.Fig. 3 and Fig. 4 is the echo-signal before and after high-pass filtering respectively.

Signal amplifier amplifies the ultrasound echo signal after high-pass filtering.

Band filter carries out filtering to the signal beyond ultrasonic signal effective frequency range, produces signal aliasing to prevent AD conversion.This band filter center frequency designations is at the mid frequency of transmitted waveform, and bandwidth is the effective bandwidth B of ultrasound echo signal, as shown in Figure 5.

A/d converter carries out digitized conversion to simulation ultrasound echo signal.In order to avoid the digital signal samples frequency using nyquist sampling theorem to obtain is higher, the present invention uses bandpass sampling mode to reduce sample frequency.Lower data signal rate can be obtained like this, be conducive to wireless transmission.The sample frequency f of bandpass sampling _sobtained by following formulae discovery

$\frac{{2f}_H}{m+1}\≤f_s\≤\frac{{2f}_L}{m},0\≤m\≤N-1$

Wherein f _hfor upper cut off frequency, f _lfor lower limiting frequency, B=f _h-f _l, N is for being not more than f _hthe maximum positive integer of/B.

Master controller receives the digital signal of ultrasonic echo, carries out packing combination, then by wireless transport module, be transferred to panel computer or smart mobile phone to data.

Panel computer or smart mobile phone pass through wifi or bluetooth module, receives ultrasonic echo data, then carry out signal processing, imaging, bladder border detection, finally calculate the volume of bladder, and be presented on panel computer or smart mobile phone screen.The calculating traditional method of Bladder Volume is carried out on two dimensional surface.The present invention, in order to reduce amount of calculation, adopts the mode of one dimension to carry out border detection and calculating

First the scanning line at horizontal center position place is carried out to the up-and-down boundary detection of one dimension.Derivative due to signal is affected by noise comparatively large, needs gaussian filtering restraint speckle on the impact of gradient

Afterwards, along left and right both direction, before current scan line, the result of a border detection searches for boundary point as a reference in its neighborhood, and according to the distance of up-and-down boundary point and the difference of the area grayscale cut-off condition as boundary search.

On this basis according to the principle of angularly scan conversion, coordinate transform is carried out to all boundary points, respectively to the smoothing process of up-and-down boundary point, obtain a smooth closed contour curve, then carry out interpolation processing, boundary point is uniformly distributed in the horizontal direction.

The estimation of bladder volume adopts the method for rotor shell integration, as shown in Figure 6.The infinitesimal of the overwhelming majority adopts trapezoid formula reference area, and the infinitesimal of marginal portion is because the asymmetric employing Triangle Formula of up-and-down boundary calculates volume.

$V=2\mathrm{\π}{\∫}_0^a\mathrm{xf}\left(x\right)\mathrm{dx}$

V＝ΣV _shell

The above, be only best mode for carrying out the invention, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, and the simple change of the technical scheme that can obtain apparently or equivalence are replaced and all fallen within the scope of protection of the present invention.

Claims (3)

1. a wireless handheld bladder scanner, it is characterized in that, comprise wireless ultrasound probe and panel computer or smart mobile phone, described wireless ultrasound probe is connected in sequence by ultrasound element, waveform mission controller, motor vertical driver, horizontal motor driver, high pass filter, signal amplifier, band filter, a/d converter, master controller, wireless transport module.

2. wireless handheld bladder scanner according to claim 1, is characterized in that, described wireless transport module is wifi or bluetooth radio module.

3. wireless handheld bladder scanner according to claim 1, is characterized in that, during its operation, the border detection of bladder is upwards carried out at one-dimensional square, comprises the following steps:

A) first the scanning line at horizontal center position place is carried out to the up-and-down boundary detection of one dimension;

B) after, along left and right both direction, before current scan line, the result of a border detection searches for boundary point as a reference in its neighborhood, and according to the distance of up-and-down boundary point and the difference of the area grayscale cut-off condition as boundary search;

C) on this basis according to the principle of angularly scan conversion, coordinate transform is carried out to all boundary points, respectively to the smoothing process of up-and-down boundary point, obtain a smooth closed contour curve, then carry out interpolation processing, boundary point is uniformly distributed in the horizontal direction;

D) estimation of bladder volume adopts the method for rotor shell integration.