CN204636311U - Medical near-infrared venae subcutaneae detects imager - Google Patents

Abstract

A kind of medical near-infrared venae subcutaneae detects imager, belongs to electronic instrumentation.The purpose of this utility model be to provide a kind of can to venae subcutaneae blood vessel realtime imaging and the real-time medical near-infrared venae subcutaneae be presented at exactly in the position of the venae subcutaneae blood vessel of human body and thickness on the skin of human body detects imager.This utility model is made up of infrared source circuit, image acquisition units circuit, graphics processing unit circuit, image-generating unit circuit.This utility model adopts electronic equipment to carry out image procossing, and final projected image can be made clear, is easy to identify.Effectively the vein blood vessel of sufferer is displayed, facilitate medical personnel to find injection point easily, and reach injection object accurately.

Description

Medical near-infrared venae subcutaneae detects imager

Technical field

This utility model belongs to electronic instrumentation.

Background technology

" extension transfusion bottle ", " having an intravenous drip " can be described as our quotidian thing in hospital usually.As the medical care precess that a kind of wound is minimum, the present majority of intravenous injection is no longer responsible for by doctor, and one of working contents becoming nurse.Nowadays, intravenous injection technology becomes one of modal medical care precess.The inpatient of 80% accepts intravenous medical treatment, and a large amount of medicines is used for the mankind in intravenous mode, and intravenous medical treatment range of application is also more and more wider, even comes into home care.The development course of intravenous injection technology, just modern medicine development epitome for centuries, the monument being therefore called modern medicine development is inundue.But foreign statistic data shows: average adult's intravenous puncture failure first rate is 28%; The rate of puncture failure first of children intravenous injection is 44%; Needing trial puncture more than 3 times just can carry out intravenous ratio in child is 43%; During intravenous injection, the ratio that " dropped stitch " phenomenon occurs is 23-28%; The ratio fallen flat that punctures in cancer patient is 12%; In inpatient, the ratio that puncture difficulty occurs for three days afterwards of being admitted to hospital is 25%; Puncture success rate is low is the maximum reason that many people are reluctant to donate blood.And due to obesity patient in recent years increase and infant increasing of number of times of having an injection often occurs that nurse is owing to can not accurately find patient's arm vein, situation about can not " hit the nail on the head ", very easily causes doctor-patient dispute.

Summary of the invention

The purpose of this utility model be to provide a kind of can to venae subcutaneae blood vessel realtime imaging and the real-time medical near-infrared venae subcutaneae be presented at exactly in the position of the venae subcutaneae blood vessel of human body and thickness on the skin of human body detects imager.

This utility model is made up of infrared source circuit, image acquisition units circuit, graphics processing unit circuit, image-generating unit circuit;

Infrared source circuit: D1-D10 is in series with a resistor, finally in parallel again, power to LED with the power supply of 5V, LED just can send the infrared light that centre wavelength is 850nm, as the radiation source of whole system;

Image acquisition units circuit: adopt OV7620 chip to be used for image acquisition, 1 pin of QV7620 chip is connected with the VCC mouth in TMS320F28335 chip, in QV7620 chip 2,10 pin ground connection, in QV7620 chip 3,4 pins connect with 128 in TMS320F28335 chip, 127 pins respectively, in QV7620 chip 6, the 8 pins 11-18 pin connect respectively in 151,152, the QV7620 chips of DSP connects the 129-135 pin in DSP respectively;

Graphics processing unit circuit, image-generating unit circuit: 10 pins meet VCC, 5 pin ground connection, 1 pin receives 122 pins of dsp chip, 2,3 pins connect with 63,62 pins of dsp chip respectively, 4 pins are received on 116 pins of DSP, 6 pins are corresponding with 119 pins of DSP to connect, and 7,8 pins are corresponding respectively to be received on 124,123 pins of DSP, and 9 pins connect with 115 pins.

This utility model adopts electronic equipment to carry out image procossing, and final projected image can be made clear, is easy to identify.Effectively the vein blood vessel of sufferer is displayed, facilitate medical personnel to find injection point easily, and reach injection object accurately.

Accompanying drawing explanation

Fig. 1 is entire system block diagram of the present utility model;

Fig. 2 is infrared source circuit schematic diagram.;

Fig. 3 is image acquisition units circuit theory diagrams;

Fig. 4 is graphics processing unit circuit theory diagrams;

Fig. 5 is image-generating unit circuit theory diagrams;

Fig. 6 is workflow diagram of the present utility model.

Detailed description of the invention

This utility model is made up of infrared source circuit, image acquisition units circuit, graphics processing unit circuit, image-generating unit circuit;

Infrared source circuit: D1-D10 is in series with a resistor, finally in parallel again, power to LED with the power supply of 5V, LED just can send the infrared light that centre wavelength is 850nm, as the radiation source of whole system;

Image acquisition units circuit: adopt OV7620 chip to be used for image acquisition, 1 pin of QV7620 chip is connected with the VCC mouth in TMS320F28335 chip, in QV7620 chip 2,10 pin ground connection, in QV7620 chip 3,4 pins connect with 128 in TMS320F28335 chip, 127 pins respectively, in QV7620 chip 6, the 8 pins 11-18 pin connect respectively in 151,152, the QV7620 chips of DSP connects the 129-135 pin in DSP respectively;

Graphics processing unit circuit, image-generating unit circuit: 10 pins meet VCC, 5 pin ground connection, 1 pin receives 122 pins of dsp chip, 2,3 pins connect with 63,62 pins of dsp chip respectively, 4 pins are received on 116 pins of DSP, 6 pins are corresponding with 119 pins of DSP to connect, and 7,8 pins are corresponding respectively to be received on 124,123 pins of DSP, and 9 pins connect with 115 pins.

Below in conjunction with accompanying drawing, further detailed description is done to this utility model:

In infrared source circuit, by each LED(D1-D10) in series with a resistor, then by each branch circuit parallel connection, power to LED with the power supply of 5V, LED just can send the infrared light that centre wavelength is 850nm, as the radiation source of whole system, see Fig. 2.

In image acquisition units, this utility model has selected the OV7620 of blue cosmos electronics, for image acquisition, this harvester has powerful figure acquisition function, direct integrated LM1881, directly can use output signal, resolution is 640*480, transmission speed is that 30 frames are per second, interlacing is lined by line scan, support VGA and QVGA two kinds of forms, there is automatic gain and AWB control, brightness can be carried out, contrast, saturation, the multiple regulatory functions such as Y correction, built-in 10 8 passage A/D converters, save the step of A/D conversion, there is high definition, prepare, fast, the feature such as small and exquisite.

Image processing module adopts the model of TI company to be the dsp chip of TMS320F28335, this DSP has powerful control and signal handling capacity, improve development efficiency, complicated control algolithm can be realized, simultaneously, which increase floating-point operation kernel, make to perform complicated floating-point operation convenient, and code time of implementation and memory space can be saved, generally speaking, this DSP has that precision is high, at a high speed, power consumption is little, cost is low, peripheral hardware integrated level is high, data and the advantage such as program memory space is large.

The H1 equipment of the Shi Ku road company that image-generating unit is selected, it uses LCD imaging technique, supports highest resolution 1920*1080, and USB interface can direct receiving computer data, can by the image live fluoroscopic after computer disposal.Its volume is little, lightweight, is convenient for carrying, and is also conducive to further simplied system structure.Imaging size is 30-100 inch, adds suitable plus lens, get final product downscaled images before it, be imaged onto human vein detect position, its internal circuit principle and and DSP between carry out the circuit of data transmission as shown in Figure 5.

Circuit connecting mode between image acquisition units with graphics processing unit is: 1 pin of QV7620 chip is connected with the VCC mouth in TMS320F28335 chip, in QV7620 chip 2,10 pin ground connection, in QV7620 chip 3,4 pins connect with 128 in TMS320F28335 chip, 127 pins respectively, in QV7620 chip 6, the 8 pins 11-18 pin connect respectively in 151,152, the QV7620 chips of DSP connects the 129-135 pin in DSP respectively.

Circuit connecting mode between graphics processing unit and image-generating unit is: projector internal circuit board 10 pin meets VCC, 5 pin ground connection, 1 pin receives 122 pins of dsp chip, and 2,3 pins connect with 63,62 pins of dsp chip respectively, and 4 pins are received on 116 pins of DSP, 6 pins are corresponding with 119 pins of DSP to connect, 7,8 pins are corresponding respectively receives on 124,123 pins of DSP, and 9 pins connect with 115 pins, so, carry out data transmission, the allomeric function of realizing circuit.

circuit working principle

OV7620 volume in image acquisition units is little, lightweight, be conducive to whole system miniaturization, equipment is easy to carry, wherein, 1 pin of OV7620 chip meets VCC, for whole chip provides power supply, 2 pin ground connection, 3 pins are IIC clocks, 4 pins are IIC data port, 5 pin VTO are used for carrying out digital video output, this mouth is not needed in this utility model, therefore directly 5 pins are reserved in circuit theory diagrams, 6 pins carry out the row synchronism output of image, 7 pins also with less than, directly reserved, 8 pins carry out the output of entire image---and field synchronization exports, 9 pins carry out pixel synchronism output, 10 pin ground connection, 11-18 pin directly receives the C0-C7 mouth in dsp chip, say that the view data collected passes to DSP and carries out image procossing.

TMS320F28335 in graphics processing unit is integrated with the strong point of DSP and microcontroller, as principal character, the monocycle multiplying of DSP, F28335 can complete the multiplication accumulating operation of 32X32 in one-period, or two 16X16 position multiplication accumulating operations, the common single-chip microcomputer of same 32 then needs more than four cycles just can complete; Have the data-handling capacity of 64, thus enable this processor realize more high-precision Processing tasks.Interrupt response enables F28335 with protecting crucial depositor and quick (less interrupt latency) response external asynchronous event fast.F28335 has 8 grades with the streamline protection mechanism of piplined memory access, therefore, does not need jumbo fast storage during F28335 high-speed cruising.Special branch's redirect (Branch-look-ahead) hardware decreases the response time that conditional order performs, and condition stores the performance that operation further improves F28335.Its each pin function is as follows: 45 pins meet 3.3V, 44 pin ground connection, and 136 pins---129 pins are I/O mouths of TMS320F28335, meet the C0 of photographic head---C7; 128 pins and 127 pins are also I/O mouths, meet A1 and A2 respectively; 151 pins and 152 pins are pins of interrupt function, meet B1 and B2 respectively.62 pins and 63 pins meet TD and RD of projector, and 115 pins meet RI, and 116 pins meet DTR, and 119 pins meet DSR, and 122 pins meet CD, and 124 pins meet RTS, and 123 pins meet CTS.During work, shown in schematic diagram, connect corresponding element in the outside of TMS320F28335 chip, and I/O power pins is connected 3.3V, core power pin is connected the power supply of 1.8V/1.9V, TMS320F28335 just can normally work.Test program can be write by JTAG to TMS320F28335 to debug.In image-generating unit, 1 pin is used for carrier detect, 2 pins receive data, 3 pins send data, 4 pins arrange detection data terminal, and 5 pins connect signal ground, and playing with 10 pins connecing power supply provides running voltage, 6 pins detect data and arrange, 7 pins detect and allow to send request of data, and 8 pins carry out data dump, and 9 pins are used for detecting to bell.

Image procossing, see Fig. 6, by being with handshake and not receiving the data from DSP with handshake mode, projects.During work, 5 pins meet GND, and 10 pins meet+12V, provide running voltage.Wherein 1 pin is connected with the CD mouth of DSP and carries out carrier detect, 2,3 pins and DSP carry out data transmission, the DTR mouth output data terminal that 4 pins meet DSP is good, DSR mouth connects 6 pins output data and sets, RTS connects 7 pins and exports permission transmission data, it is clear to send that CTS connects 8 pin functions, and RI connects 9 pins outputs and detects to bell.

This utility model working-flow is:

First infrared light supply is lighted---LED array, now photographic head just can scan region to be measured, acquisition of image data line number of going forward side by side reportedly is passed, after computer receives data, start to carry out image procossing, view data after process passes to image procossing, region to be measured is projected image onto after image procossing completes, whether the position observing image is correct, if correct, just continue process, if incorrect, process the position of image procossing, also whether detected image position is correct in process again.

The conveniently convergence of birefringence light, adopts optical texture unit (The Optical Structure Unit) to form primarily of infrared light supply, lens, infrared fileter and heat mirror.Deoxyhemoglobin in venous blood has obvious Absorption to the near infrared light that wavelength is about 760nm and 850nm, therefore the quality of the wavelength chooses of LED light source more close to these two absorption peaks then infrared imaging is better, on market, the LED of 760nm wavelength is little, usual needs are customized, price is also higher, and wavelength is 850nm, 880nm, the LED of 940nm is more common, therefore centre wavelength is selected to be that the LED of 850nm is arranged in plane annular array as infrared radiation light source, the uniform light sent is dispersed with the absorption being beneficial to tissue, the contrast of image can well be improved, the details of reflection object, lens are for collecting the infrared light of reflection, converge to photographic head, make imaging more clear, infrared fileter can filter the visible ray of below wavelength 700nm, and it is high to the near infrared light transmitance of more than 700nm, the interference of extraneous visible ray can be prevented, reduce background noise, greatly enhance the quality gathering image, heat mirror can through visible ray, and near infrared light is reflected, can projecting light path and collection light path be converged in same light path, thus ensure that vein image original position is reproduced.

What described image acquisition units (Camera Image Acquisition Unit) was selected is that the DLC130 image capture device of patriot company production is for image acquisition, its resolution is 1280*1024, there are 1,300,000 pixel black and white CMOS progressive scanning picture sensors, without compression, without interpolation, can professional application in collecting image of computer, high speed USB 2.0 interface, transmission speed can reach 480Mb/s, support dynamic image capture, the view data of collection can be real-time transmitted to computer, carry out post-processed, plug and play, without the need to external power supply, simple and convenient.

Computer Image Processing unit (Computer image processing unit): the data of collection are directly sent to computer by image acquisition units in real time, carry out the post-processed of image on computers, post-processed comprises Image semantic classification and image characteristics extraction.Pretreatment can make vein blood vessel structure more outstanding, image enchancing method has image gray processing, image filtering (mean filter, morphology operations, high cap filtering, low cap filtering), dynamically determines area-of-interest (image binaryzation, determine area-of-interest, compressed image), gray scale normalization, hand back vein segmentation (Dynamic global threshold method) etc., feature extraction adopts the method based on wavelet decomposition and mean absolute deviation, well retains hand vein information.

The H1 equipment of the Shi Ku road company that described projector image-generating unit (Projector Imaging Unit) is selected, it uses LCD imaging technique, support highest resolution 1920*1080, USB interface can direct receiving computer data, the image after computer disposal can be shown in real time.Its volume is little, lightweight, is convenient for carrying, and is also conducive to further simplied system structure.Imaging size is 30-100 inch, adds suitable plus lens, get final product downscaled images before it, is imaged onto human vein and detects position.

Claims (1)

1. medical near-infrared venae subcutaneae detects an imager, it is characterized in that: be made up of infrared source circuit, image acquisition units circuit, graphics processing unit circuit, image-generating unit circuit;

Infrared source circuit: D1-D10 is in series with a resistor, finally in parallel again, power to LED with the power supply of 5V, LED just can send the infrared light that centre wavelength is 850nm, as the radiation source of whole system;

Image acquisition units circuit: adopt OV7620 chip to be used for image acquisition, 1 pin of QV7620 chip is connected with the VCC mouth in TMS320F28335 chip, in QV7620 chip 2,10 pin ground connection, in QV7620 chip 3,4 pins connect with 128 in TMS320F28335 chip, 127 pins respectively, in QV7620 chip 6, the 8 pins 11-18 pin connect respectively in 151,152, the QV7620 chips of DSP connects the 129-135 pin in DSP respectively;

Graphics processing unit circuit, image-generating unit circuit: 10 pins meet VCC, 5 pin ground connection, 1 pin receives 122 pins of dsp chip, 2,3 pins connect with 63,62 pins of dsp chip respectively, 4 pins are received on 116 pins of DSP, 6 pins are corresponding with 119 pins of DSP to connect, and 7,8 pins are corresponding respectively to be received on 124,123 pins of DSP, and 9 pins connect with 115 pins.