CN102894960A - Transmission-type hand back vein three-dimensional infrared imager - Google Patents

Abstract

The purpose of the present invention is to provide a kind of auxiliary medical equipment capable of obtaining the position and depth information of the veins on the back of the human hand. The equipment involved in the present invention is composed of an infrared light source, a multi-channel camera, a visible light cut-off infrared transmission filter and a calculation processing unit; The technical solution is: the infrared light source emits a near-infrared light and irradiates the area to be detected. The infrared light penetrates the back of the hand and enters the camera through the visible light cut-off infrared filter. The two cameras can collect skin images from different angles. After being processed by the computing processing unit, the position and depth map of the venous blood vessel can be obtained, thereby assisting the doctor to obtain the position and depth information of the blood vessel in the area to be injected, and improving the success rate of injection.

Description

Transmission 3D Infrared Imager of Dorsal Hand Vein

technical field

The present invention is a medical auxiliary instrument, and specifically relates to an infrared vein stereoscopic imaging instrument, which can realize the collection of veins on the back of the patient's hand, and obtain the three-dimensional structure diagram of the veins on the back of the hand through computer processing, and assist the doctor to complete the three-dimensional venipuncture. guide.

Background technique

Venipuncture is a very common and very important medical operation, especially when the critically ill patients are to be rescued quickly in an emergency, it is particularly important to be able to puncture successfully quickly. However, it is not easy to perform venipuncture quickly and accurately: obese patients have thick subcutaneous fat and deep veins, so the tourniquet must be tightly tied during venipuncture; patients with edema are difficult to see due to the cover of tissue edema. When Qinghe touches the blood vessel and tightens the tourniquet, he needs to press the puncture site with his fingers, and the action must be quite fast, otherwise the local edema will make the vein unable to be seen clearly; young and uncooperative children often need to press the blood vessel puncture. Very experienced nurses, and at least 2 tourniquets should be applied; patients with peripheral circulatory failure, especially those with hemorrhagic shock, have submerged superficial veins and collapsed blood vessels, making venipuncture very difficult.

In order to solve the problem that veins are difficult to find, a lot of related research has been done at home and abroad. The main imaging methods include laser scanning, transmission, and infrared reflection-based display imaging and infrared reflection-based imaging. Back projection imaging.

The dual-wavelength laser scanning projection display system researched by the State Key Laboratory of Modern Optical Instruments of Zhejiang University in 2008 uses laser scanning for development. Its working principle is that the infrared laser emitted by the infrared laser is reflected by the dichroic mirror, then reflected by the line scanning galvanometer and the field scanning galvanometer, and finally scans the patient's skin area with a certain trajectory. When the control unit turns on the visible light laser, the visible light passes through optical devices such as dichroic mirrors, line scanning galvanometers, and field scanning galvanometers to irradiate the patient's skin area, thereby displaying the position information of the veins.

my country Nanjing Linkang Medical Technology Co., Ltd. specially designed the vein imaging system on the back of the hand for patients with hidden superficial veins in 2005. It uses a unique spectrum (red light) projection principle to greatly enhance the contrast between blood vessels and surrounding tissues. Clearly visible while preserving the authenticity of the blood vessels.

Reflective infrared imaging projection system is currently researched more in this field. The technicians of Luminetx Company in the United States began to study reflective infrared vein imaging technology in 1999, and successfully developed a vein viewer. Infrared light is projected on the patient's puncture site, and the reflected infrared light containing information about the distribution of subcutaneous veins is imaged by the camera. The computer system performs real-time enhancement processing on this image, and then the projector is projected onto the surface of the patient's arm, making the image of the illuminated area Subcutaneous vein tracks are clearly shown on the skin.

However, the final imaging of these technologies is all two-dimensional information, without the depth information of blood vessels. In addition, blood vessel imaging at different levels will produce virtual intersections on the two-dimensional image, which brings about the problem that it cannot Correctly grasping the depth of puncture and the virtual intersection point will affect the nurse's choice of blood vessels. Moreover, most of the existing dorsal hand vein imaging systems use reflected light for imaging, and the reflected light can only reflect the surface vein information of the back of the hand, and cannot image the deeper veins of the palm. Using the method of active illumination through transmitted light, the light emitted by the light source passes through the entire palm, and images of the veins of each layer of the palm can be obtained. And when it passes through the palm, it is equivalent to a diffuse reflection process, which can make the energy of the imaging beam more uniform and facilitate subsequent processing.

Therefore, this paper proposes a new instrument: using the method of infrared transmitted light active illumination to obtain the image of the dorsal vein, and using binocular stereo vision to process the collected vein image to obtain the three-dimensional information of the dorsal vein.

Contents of the invention

The purpose of the present invention is to solve the problem that veins are difficult to find due to obesity, dark skin color, anemia, hypotension, polycythemia, poor quality of veins and peripheral vasoconstriction, etc., so as to improve the success rate of venipuncture and reduce the burden of patients. Pain, fight for rescue time.

The present invention utilizes that the absorption of infrared rays by blood is stronger than that of surrounding tissues, and the image formed by infrared rays irradiating the skin area through an infrared camera, the blood vessels are obviously darker than the surrounding tissues, thus, a clear contrast image can be obtained image.

The invention consists of an infrared light source (1), an infrared camera (4) (two or more), a visible light cut-off infrared transmission color filter (3) and a computer processor (5). Wherein the infrared light source (1) is an LED light source with a wavelength of 850nm (or other wavelengths); the visible light cut-off infrared transmission color filter (3) is arranged at the front end of the infrared camera (4), and its characteristic is that it can effectively filter out visible light and only transmit In order to ensure the imaging quality of the image collected by the infrared camera; two or more infrared cameras (4) are placed on both sides of the patient’s area to be detected (2) at a certain distance, and then the two images are transmitted to The calculation and processing unit (5) forms a three-dimensional structure diagram of the vein with depth information after processing.

The present invention may also include:

1. The infrared light source (1) used in the present invention is designed in the shape of a disc, so as to obtain uniform light intensity in the irradiation area.

2. The present invention can use the method of increasing the power of the infrared light source in order to obtain a clear image, and can also adopt the method of improving the light intensity performance of the camera, for example: apply water or vaseline to the measured skin area to reduce the skin's exposure to infrared light. Direct reflection; setting the angle of the infrared camera and light source; adding optical lenses in front of the infrared camera, etc.

3. The visible light cut-off infrared transmission color filter (2) adopted in the present invention is to filter out the influence of visible light, but in fact the light filter can not completely filter out visible light, thus it is necessary to process the collected image, the commonly used method Such as histogram equalization enhancement method and image enhancement method based on wavelet transform.

4. The result of the present invention is to collect vein images in real time and use binocular stereo vision to process the collected vein images to obtain three-dimensional information of veins on the back of the hand. The obtained three-dimensional information is a pseudo-color image containing vein depth information, and different colors or gray scales can represent tissue structures at different depths.

The main contribution and features of the present invention are: solving the problem of low contrast and difficult imaging of veins in special patients, and providing depth information for veins at different levels, reducing the difficulty of venipuncture.

Description of drawings

Figure 1 is a block diagram of the system. Among them, 1 is an infrared light source, 2 is an area of a patient to be detected, 3 is a visible light cut-off infrared filter, 4 is an infrared camera, and 5 is a calculation processing unit.

Figure 2 is a flow chart of the algorithm of the system.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

As shown in Figure 1, the patient's area to be detected (2) is placed in the middle of the binocular or multi-eye infrared camera (4) and the infrared light source (1), and the infrared image of the vein on the back of the hand is collected by the infrared camera, and the calculation processing unit ( 5) According to the image captured by the binocular or multi-eye infrared camera (4), the noise is removed through image filtering, and the vein image is stereo-matched to realize the calculation of the three-dimensional information of the vein blood vessel, and the vein blood vessel is represented by grayscale and pseudo-color information depth information.

Claims (4)

1. the three-dimensional infreared imaging device of transmission-type hand back vein is characterized in that system comprises following part: patient zone to be detected (2), infrared light filter (3), video camera (4), infrared light supply (1), the calculation processing unit (5) of seeing through of visible light cut-off.Its mid-infrared light source (1) is the led light source of 850nm wavelength (or other wavelength), the active illumination of feasible system; The infrared visible light information that sees through the filtering natural environment light of light filter (3) of visible light cut-off; Video camera (4) gathers the skin image under the diverse location, proposes to comprise after treatment the vein image of depth information, and assist personnel is finished the puncture of vein.

2. the three-dimensional infreared imaging device of transmission-type hand back vein as claimed in claim 1, it is characterized by: infrared multispectral light source (4) can be distributed on the disk by the infrared light supply light emitting diode; The porose throw light that projection is sent in lamp source disc center passes through, during work lamp source disc be in tested the back of the hand zone under.

3. the three-dimensional infreared imaging device of transmission-type hand back vein as claimed in claim 1 is characterized by: the responsive video cameras of two or more infrared lights be positioned over tested the back of the hand zone directly over, make through the Infrared of the back of the hand being accepted by thermal camera as much as possible.

4. the three-dimensional infreared imaging device of transmission-type hand back vein as claimed in claim 1, it is characterized by: utilize calculation processing unit (5) that binocular or multi-lens camera (4) are carried out vessel extraction and Stereo matching, calculate the three dimensional local information that obtains blood vessel, its depth information represents by pseudo-color or gray scale.

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