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Method for intelligent blood pricking of terminal of fingertip
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An intelligent, fingertip technology, applied in the field of medical image processing, can solve the problems of different lengths, angles and strengths of lancet insertion, poor blood collection experience, infection of medical staff and patients with infectious diseases, etc.
Pending Publication Date: 2020-10-23
CHONGQING UNIV OF POSTS & TELECOMM
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[0002] It is a very common way to collect blood by taking blood from the tip of the fingertip during the blood test. The blood collection from the tip of the fingertip requires the medical staff to adjust the length of the lancet and the strength of the struggle according to the condition of the finger of the person being collected, and then prick the finger to collect blood and prick the needle. The length and strength of the blood will directly affect the pain of the blood-collected person. The medical staff need long-term experience to sum up a relatively suitable method, which is inefficient. The medical staff are also easily infected by patients with infectious diseases during the blood lancing process. Artificial blood lancing It is not good for the blood sampler and the medical staff
[0003] Traditional lancets are used for automatic fingertip lancets. Different blood collectors have large differences in finger thickness and shape. The length, angle and force of lancet insertion are different, and blood collection cannot be performed quickly and accurately. Some blood collection methods using machines also cannot accurately find a better blood collection point, and the depth and strength of the blood collection needle are not well controlled, resulting in a poor blood collection experience
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Embodiment 1
[0045] This embodiment provides a specific implementation solution.
[0046] The binocular camera needs to select the appropriate left and right camera distance and camera angle according to the fixed position of the finger. Before collecting the image, the binocular positioning and calibration of the camera is performed to obtain the internal and external parameter matrix. Then, the coordinates of the object are calculated by means of coordinate transformation; the system includes four coordinate systems: the world coordinate system, the camera coordinate system, the image coordinate system and the pixel coordinate system. In different coordinate systems, the coordinates are different, in order to transform all point matrix R and translation vector T to achieve.
[0047] Each frame of image captured by the camera is a pixel image composed of pixels, which has no practical significance in coordinate calculation, so coordinate transformation is required to convert pixel coordin...
Embodiment 2
[0061] On the basis of Embodiment 1, this embodiment provides a method for obtaining coordinate points of lancet pricking.
[0062] First of all, the fingertip contour of the image needs to be obtained, and the present invention adopts mean value iterative segmentation to obtain, specifically including the following steps:
[0063] Initialize a threshold T, which takes the average gray value of the image;
[0064] Segment the grayscale image according to the threshold, separate it into a finger image and a background image, and calculate the grayscale mean of the two images respectively;
[0065] Update the threshold T so that the mean value of the gray value of the finger plus the mean value of the gray value of the background image is equal to T;
[0066] The grayscale image is binarized and segmented using a threshold value to obtain a fingertip contour map.
[0067] For the obtained fingertip contour map, calculate the center distance of the fingertip contour, expressed ...
Embodiment 3
[0074] In this embodiment, on the basis of Embodiment 1, the optimal angle, power and needle insertion length of the lancet for blood lancing operation are obtained.
[0075] The present invention adopts the mass point-spring method to establish the deformation model in the process of the lancet piercing the fingertip, which is expressed as:
[0076]
[0077] Among them, ε is the deformation rate; n is the number of model particles; L is the length of the elastic body before deformation; ΔL is the elongation after deformation under the action of external force.
[0078] According to the deformation rate calculation formula, the deformation rate of the i-th layer spring tangential surface spring can be obtained, which is denoted as ε i , then the needle length Z for lancing blood 0 ,Expressed as:
[0079]
[0080] Among them, l 1 is the deformation of the virtual body spring in the normal direction of the l layer particle, ε i is the deformation rate of the tangential...
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Abstract
The invention relates to the field of medical image processing, in particular to a method for intelligent blood pricking of a terminal of a fingertip. The method comprises the steps of taking a binocular photo of a finger with a binocular camera, acquiring image three-dimensional point cloud data according to a binocular stereo matching algorithm, and storing the point cloud data in a storage module; acquiring a fingertip outline map by employing averaging iteration segmentation and calculating an outline central moment, and intelligently identifying a puncture coordinate point of a lancet bycombining with the outline central moment; establishing a deformation model in the process of puncturing the fingertip by the lancet by employing a mass-spring method, and establishing a force feedback model in the blood pricking process by employing a spring-damper model; and working out the optimal lancet angle, force and lancet insertion length according to the fingertip deformation model and the force feedback model by combining with a fingertip three-dimensional reconstructed image. The method can effectively reduce the workload of a medical worker, and avoids contact between the medicalworker and a blood sampled person for fear of being infected with an infectious disease, and compared with an existing blood sampling method, the method can perform blood sampling more accurately, andprovides more comfortable blood sampling experience to a user.
Description
technical field [0001] The invention relates to the field of medical image processing, in particular to a method for intelligent blood pricking at the tip of a fingertip. Background technique [0002] It is a very common way to collect blood by taking blood from the tip of the fingertip during the blood test. The blood collection from the tip of the fingertip requires the medical staff to adjust the length of the lancet and the strength of the struggle according to the condition of the finger of the person being collected, and then prick the finger to collect blood and prick the needle. The length and strength of the blood will directly affect the pain of the blood-collected person. The medical staff need long-term experience to sum up a relatively suitable method, which is inefficient. The medical staff are also easily infected by patients with infectious diseases during the blood lancing process. Artificial blood lancing It is not good for the blood sampler and the medical...
Claims
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