CN203898276U - Vein imaging and indicating device - Google Patents

Abstract

The utility model belongs to the field of optical technology and medical optical imaging technology, and specifically relates to a vein imaging indicating device. The array indicates blood vessels in the form of discrete light points, without the need for image processing with a large amount of data, and without image calibration. The technical solution adopted is: including near-infrared LED light source and imaging lens for illuminating blood vessels, a scanning galvanometer is arranged between the imaging lens and its imaging plane, and a sensor capable of sensing near For the linear array photoelectric sensing element of infrared light, a near-infrared interference filter is arranged between the imaging plane where the linear array photoelectric sensing element is located and the optical axis of the reflected light of the scanning galvanometer. The mirror surface of the scanning galvanometer is parallel, the driving end of the signal processing and driving circuit is connected with a visible light LED array, and a projection lens is arranged between the visible light LED array and the near-infrared interference filter.

Description

A vein imaging indicating device

technical field

The utility model belongs to the field of optical technology and medical optical image technology, in particular to a vein imaging indicating device.

Background technique

In clinical medicine, venipuncture is one of the main technical operations for treating and rescuing patients. Since the age, sex, fat and thinness of the patients are different, the thickness, depth, softness, hardness, and curvature of the blood vessels also have their own characteristics, and the difficulty of puncturing should vary from person to person. In recent years, the number of obese patients has been increasing with the improvement of people's living standards. Obese patients and infant patients are difficult to find blood vessels during venipuncture due to thick fat, small blood vessels, and pigmentation. problem. In the future, the premise of seeking automatic venipuncture by machine in a sterile environment is firstly to be able to find blood vessels quickly and efficiently, and to accurately locate and indicate the three-dimensional blood vessels.

Utilizing the principle that the absorption of reduced hemoglobin in blood vessels by near-infrared light with a wavelength in the range of 0.75-1.5 μm is far greater than that of human bones and muscle tissues, currently, the vascular imaging and imaging technologies that are being developed and used mainly It uses near-infrared light source illumination and a camera or video camera that can sense near-infrared light to collect blood vessel images, and then filters the obtained blood vessel images, normalizes image size and gray scale, segments, refines, and extracts features for personal use. Biometric identification, or filter and enhance the obtained vascular images, send them to the projection device, and project them onto the blood vessels in situ, guiding medical staff to use them for venipuncture or vascular image analysis of patients, and to diagnose related vascular diseases.

In the acquisition of blood vessel images, it is mainly to use a camera or a camera that can sense near-infrared light composed of area array CCD or CMOS image sensor devices to collect blood vessel images, and then enhance the obtained blood vessel images through computer software or embedded hardware circuit systems. Filtering and other processing tasks. The processed image is sent to the DLP or LCD micro-projection device composed of LED or semiconductor laser and DMD (digital micro-mirror) or liquid crystal, and the blood vessel image is projected to the original position of the blood vessel on the skin surface to present the image of the blood vessel. During projection, the projected blood vessel image must be calibrated so that it can be accurately projected to the original position of the blood vessel.

Also, in the image acquisition and projection optical path, the camera and the projector are respectively located on both sides of the reflector, symmetrical with respect to the reflector, and form an included angle of 90 degrees to each other. The mirror is completely transparent to visible light (such as green light) and completely reflective to near-infrared light. The camera side is responsible for collecting near-infrared blood vessel images, which are processed by a computer or embedded system and then sent to the projector. , to transmit the image of blood vessels in visible light. Due to the use of reflectors that transmit visible light and reflect infrared light, image acquisition and projection do not affect each other.

The problems in these technologies are: firstly, the acquired image should be filtered to eliminate the influence of optical or electrical noise on the blood vessel image; The third is to calibrate the projection image so that it can be accurately projected to the original position of the blood vessel to guide the medical staff to perform accurate blood vessel positioning and venipuncture; the fourth is that expensive projectors and infrared cameras or video cameras are required for specific implementation , and computers (or embedded systems), which are expensive and bulky, and require specialized image processing software.

Contents of the invention

In order to solve the problems in the prior art, the utility model proposes a method of using linear array photoelectric sensing elements to receive scanning imaging signals, and after analog or digital processing of the photoelectric signals, the visible light LED array is used to indicate blood vessels in the form of discrete light points. , a vein imaging indicating device with low equipment cost, no need for image processing with a large amount of data, and no need for image calibration.

In order to achieve the above purpose, the technical solution adopted by the utility model is: including a near-infrared LED light source for illuminating blood vessels and an imaging lens for linear array imaging of blood vessels, a scanning galvanometer is arranged between the imaging lens and its imaging plane, There is an included angle between the scanning galvanometer and the imaging optical axis of the imaging lens. A linear array photoelectric sensor element is arranged on the image plane reflected by the scanning galvanometer. The imaging plane where the linear array photoelectric sensor element is located and the reflected light of the scanning galvanometer A near-infrared interference filter is arranged between the optical axes, and the near-infrared interference filter is parallel to the mirror surface of the scanning vibrating mirror at rest.

The linear array photoelectric sensing element is connected to the signal input end of the signal processing and driving circuit, the driving end of the signal processing and driving circuit is connected with a visible light LED array, and a visible light LED array and a near-infrared interference filter are also provided with The projection lens is used to image the visible light LED array on the imaging plane reflected by the near-infrared interference filter.

The visible light LED array is arranged in a longitudinal zigzag shape.

The visible light LED array is visible red light or green light LED.

The near-infrared LED light source is a plurality of near-infrared LEDs, and surrounds around or on the same side of the imaging lens.

A dodging plate is arranged at the near-infrared LED light source.

The angle between the scanning galvanometer and the imaging optical axis of the imaging lens is 45°.

The linear array photoelectric sensing element is a linear array photodiode array or a linear CCD array or a linear CMOS array.

The signal processing and driving circuit is a multi-channel amplification driving circuit, and each channel corresponds to each LED of the visible light LED array.

Compared with the prior art, in the device of the present invention, blood vessel imaging and indication share the same scanning mirror and optical path, and the linear array photoelectric sensing element is located at the transmission imaging plane after the imaging lens passes through the near-infrared interference filter, indicating the blood vessel The visible light LED array light source is imaged by the projection lens on the imaging plane reflected by the near-infrared interference filter, and the scanning galvanometer ensures that the imaging and the light projection indication are synchronized when swinging; and the linear array photoelectric sensing element is photosensitive The imaging length is the same as the imaging length of the visible light LED array indicating blood vessels, and there is no problem that the size of the imaging and projection is inconsistent and needs to be adjusted. The utility model uses a synchronous line scan and a light projection indicating device to indicate blood vessels on the skin surface with dense discrete light points instead of image display. The signal collected and converted by the linear array photoelectric sensing element is processed by an analog or digital circuit, and the shape and direction of the blood vessel are indicated with visible light at the original position of the blood vessel. The imaging and projection share the same optical path in the device of the utility model, without calibration and image processing with a large amount of data, and has the characteristics of simplicity and practicability.

Furthermore, the visible light LED array of the utility model device is arranged in a longitudinal zigzag shape, and the visible light LED array light source arranged in a zigzag linear array is imaged on the image plane reflected by the near-infrared interference filter through the projection lens to form a reduced image. . When imaging with the lens, it has a certain depth of field. The longitudinal dimension of the zigzag is within the depth of field of the projection lens, which can ensure that each LED light source can be clearly imaged, and then projected to the Blood vessels are indicated on the surface of the skin, ensuring sufficient image points and sufficiently small spacing.

Furthermore, the signal processing and driving circuit of the utility model device is a multi-channel amplification driving circuit, and the photoelectric signal output by each photoelectric element of the linear array photoelectric sensing element can be multi-channel amplified, compared and driven in parallel by an analog or digital circuit. , corresponding to each LED of the visible light LED array one by one, not in the form of venous blood vessel images, and does not require corresponding software or image processing problems of embedded systems.

Furthermore, the device of the present invention is provided with a uniform light plate at the near-infrared LED light source, which can uniformly treat the near-infrared LED light source and then irradiate the human skin surface at the blood vessel to be indicated.

Description of drawings

Fig. 1 is the structural representation of the utility model device;

Among them, 1 is near-infrared LED light source, 2 is imaging lens, 3 is scanning galvanometer, 4 is projection lens, 5 is visible light LED array, 6 is signal processing and driving circuit, 7 is linear array photoelectric sensing element, 8 is Near Infrared Interference Filters.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Referring to Fig. 1, the technical scheme adopted by the device of the present utility model is: comprising a near-infrared LED light source 1 for illuminating blood vessels and an imaging lens 2 for linear array imaging of blood vessels, the near-infrared LED light source 1 is several near-infrared LEDs, Around or on the same side of the imaging lens 2, and near-infrared LED light source 1 is provided with a homogeneous plate, and a scanning galvanometer 3 is provided between the imaging lens 2 and its imaging plane, and the imaging light of the scanning galvanometer 3 and the imaging lens 2 There is an included angle of 45° between the axes, and a linear array photoelectric sensing element 7 is arranged on the image plane reflected by the scanning galvanometer 3, and the linear array photoelectric sensing element 7 is a linear array photodiode array or a linear array CCD array or a linear array CMOS Array, near-infrared interference filter 8 is arranged between the imaging plane of line array photoelectric sensing element 7 and the optical axis of the reflected light of scanning galvanometer 3, and the scanning galvanometer 3 when near-infrared interference filter 8 is stationary The mirror surfaces are parallel; the linear array photoelectric sensing element 7 is connected to the signal input end of the signal processing and driving circuit 6, and the driving end of the signal processing and driving circuit 6 is connected to a visible light LED array 5, and the visible light LED array 5 is arranged in a zigzag longitudinal direction visible red or green LED, the light source imaging length of the visible light LED array 5 is the same as the photosensitive imaging length of the linear array photoelectric sensing element 7, and a projection The lens 4 and the projection lens 4 are used to image the light source of the visible light LED array 5 on the image plane reflected by the near-infrared interference filter 8 , and the signal processing and driving circuit 6 is a multi-channel amplification driving circuit.

The usage method of the utility model specifically includes: a light source composed of several near-infrared LEDs surrounds the imaging lens 2 or on the same side, irradiates the surface of the human skin at the blood vessel to be indicated after being uniformly processed by a uniform light plate; the scanning vibrating mirror 3 is placed The imaging lens 2 and its imaging plane form an included angle of 45° with the imaging optical axis when stationary, and under the action of the driving current of the signal processing and driving circuit 6, swing around an angle of 45° to reflect the focused imaging light and then transmit it. The near-infrared interference filter 8 is focused on the linear array photoelectric sensing element 7; the near-infrared interference filter 8 is placed between the optical axis of the reflected light of the scanning galvanometer 3 and the imaging plane of the linear array photoelectric sensing element 7, It forms an included angle of 45° with the optical axis and is parallel to the reflective surface of the scanning galvanometer 3 at rest, allowing only near-infrared light to transmit to the image plane, avoiding the interference of external light sources on the vein imaging light; linear array photoelectric sensing element 7 is placed on the image plane reflected by the scanning galvanometer 3, and the vein imaging optical signal is converted into multiple electrical signals in the form of a linear array, and output in parallel; the electrical signals output in parallel are processed by multiple parallel amplification and filter circuits, After voltage comparison, it is sent to the driving circuit to control the lighting and extinguishing of the visible red or green LED. Visible monochromatic red or green LED light sources arranged in a zigzag linear array are imaged on the image plane reflected by the near-infrared interference filter 8 through the projection lens 4. The zigzag arrangement is to increase the number of imaging points to improve resolution, and at the same time Using the depth of field of the projection lens 4, each LED light source can be clearly imaged on the image plane. The near-infrared interference filter 8, the scanning galvanometer 3 and the imaging lens 2 are projected onto the skin surface to complete the working process.

The imaging and projection of the utility model share the same optical path, and through synchronous line scanning and light projection indication, dense discrete light points are used to indicate blood vessels on the skin surface, and the signal collected and converted by the linear array photoelectric sensor element 7 is passed through an analog or digital circuit Processing, using visible light to indicate the shape and direction of the blood vessel at the original position of the blood vessel, no need for calibration, no need for image processing with a large amount of data, simple and practical, and low cost.

Claims (8)

1. A vein imaging indicating device, characterized in that: comprising a near-infrared LED light source (1) for illuminating blood vessels and an imaging lens (2) for blood vessel line array imaging, between the imaging lens (2) and its imaging plane A scanning galvanometer (3) is arranged between them, and there is an angle between the scanning galvanometer (3) and the imaging optical axis of the imaging lens (2), and a linear array photoelectric sensor is arranged on the image plane reflected by the scanning galvanometer (3) Component (7), a near-infrared interference filter (8) is arranged between the imaging plane where the line array photoelectric sensing element (7) is located and the optical axis of the reflected light of the scanning galvanometer (3), the near-infrared interference filter (8) parallel to the mirror surface of the scanning vibrating mirror (3) when stationary; The linear array photoelectric sensing element (7) is connected to the signal input end of the signal processing and driving circuit (6), and the driving end of the signal processing and driving circuit (6) is connected with a visible light LED array (5), and the visible light LED array A projection lens (4) is also arranged between (5) and the near-infrared interference filter (8), and the projection lens (4) is used to image the visible light LED array (5) on the reflection of the near-infrared interference filter (8). on the rear imaging plane. 2 . The vein imaging indicating device according to claim 1 , characterized in that: the visible light LED array ( 5 ) is arranged in a longitudinal zigzag shape. 3 . 3. The vein imaging indicating device according to claim 2, characterized in that: said visible light LED array (5) is visible red light or green light LED. 4. The vein imaging indicating device according to claim 1, characterized in that: the near-infrared LED light source (1) is a plurality of near-infrared LEDs, and surrounds around or on the same side of the imaging lens (2). 5. The vein imaging indicating device according to claim 4, characterized in that: said near-infrared LED light source (1) is provided with a uniform light plate. 6. The vein imaging indicating device according to claim 1, characterized in that the angle between the imaging optical axis of the scanning galvanometer (3) and the imaging lens (2) is 45°. 7. The vein imaging indicating device according to claim 1, characterized in that: said linear photoelectric sensing element (7) is a linear photodiode array or a linear CCD array or a linear CMOS array. 8. The vein imaging indicating device according to claim 1, characterized in that: said signal processing and driving circuit (6) is a multi-channel amplification driving circuit, and each channel is connected with each LED of the visible light LED array (5) One to one correspondence.