Method for measuring PICC catheter length and locating its tip based on mixed reality technology

Abstract

The present invention belongs to the field of PICC catheterization technology, and specifically relates to a method for measuring the length and positioning the tip of a PICC catheter based on mixed reality technology. The invention can accurately measure and correct the length of a PICC catheter by combining a three-dimensional vascular model of a patient with multiple control models in a database, thereby improving the accuracy and safety of catheterization. Taking into account the individualized data of the patient's arm circumference, body fat percentage, and vascular elasticity, the length of the PICC catheter is more in line with individual physiological characteristics, improving the treatment effect. Using mixed reality technology, the catheterization position can be obtained and adjusted in real time to avoid errors that may occur in traditional methods. Accurate catheterization length and tip positioning reduce complications that may occur during PICC catheterization. The personalized and accurate catheterization method reduces intrusion on patients and improves patients' comfort and satisfaction. Through automated data processing and model matching, the operation process of medical staff is simplified and work efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of PICC catheterization, and in particular relates to a method for measuring the length of a PICC catheter and locating its tip based on mixed reality technology. Background Art

[0002] In the medical field, peripherally inserted central catheters (PICCs) are an important treatment method and are widely used in patients who require long-term infusion, chemotherapy or nutritional support. However, length measurement and tip positioning during PICC insertion have always been a technical challenge.

[0003] Traditional methods for measuring the length of PICC catheters and locating the tip mainly include surface measurement and X-ray positioning. Although surface measurement methods, such as the horizontal "L" method and the "I" shape measurement method, are easy to operate, they are greatly affected by individual differences in patients and surface landmarks, and the accuracy of the measurement results is difficult to guarantee. Although the X-ray positioning method is accurate in positioning, it requires patients to be exposed to X-rays, which has certain radiation risks, and the operation process is complicated, which increases the patient's pain and medical costs.

[0004] In recent years, with the rapid development of mixed reality technology, its application in the medical field has become increasingly widespread. By integrating the technical features of virtual reality and augmented reality, mixed reality technology can provide users with a more natural and realistic interactive experience. In the process of PICC catheterization, mixed reality technology has been initially applied, but it cannot effectively adapt to the inaccurate measurement and positioning errors of catheter length and tip position caused by the individual characteristics of different patients. Summary of the invention

[0005] The purpose of the present invention is to provide a method for measuring the length of a PICC catheter and locating its tip based on mixed reality technology, which can achieve personalized adjustment of the catheterization process according to the individual characteristics of the patient, thereby improving the treatment effect and patient comfort.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The method for measuring the length and positioning the tip of a PICC catheter based on mixed reality technology includes:

[0008] Collect image data of the superior vena cava from the patient's peripheral arm vein to the heart area, build a three-dimensional vascular model of the patient based on the image data, and mark it as a target three-dimensional vascular model;

[0009] Acquire multiple 3D vascular models of PICC catheters in the database and mark them as control 3D vascular models;

[0010] obtaining blood vessel similarities between a target three-dimensional blood vessel model and a plurality of reference three-dimensional blood vessel models;

[0011] According to the vascular similarity, a control three-dimensional vascular model that meets the preset conditions is obtained and marked as a similar three-dimensional vascular model;

[0012] Acquire a similarity compensation value according to the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model;

[0013] Acquire the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model, and acquire the puncture compensation value according to the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model;

[0014] Obtain the patient's arm circumference data, body fat percentage, and vascular elasticity value, obtain the corresponding arm circumference data, body fat percentage, and vascular elasticity value according to the similar three-dimensional vascular model, and obtain the arm circumference compensation value, body fat compensation value, and vascular elasticity compensation value respectively according to the patient's arm circumference data, body fat percentage, and vascular elasticity value and the arm circumference data, body fat percentage, and vascular elasticity value corresponding to the similar three-dimensional vascular model;

[0015] The length of the corresponding PICC catheter is obtained according to the similar three-dimensional vascular model, and the length of the PICC catheter of the patient is obtained according to the arm circumference compensation value, the body fat compensation value, the vascular elasticity compensation value, the similarity compensation value, the puncture compensation value and the length of the PICC catheter corresponding to the similar three-dimensional vascular model;

[0016] The tip position of the PICC catheter is obtained according to the patient's PICC catheter length and the target three-dimensional vascular model.

[0017] In a preferred embodiment, the step of obtaining a plurality of three-dimensional vascular models of PICC catheters in a database and marking them as reference three-dimensional vascular models comprises:

[0018] Collect patient arm length data;

[0019] Construct arm length assessment intervals based on patients’ arm length data;

[0020] A plurality of three-dimensional vascular models of PICC catheters corresponding to the arm length data within the arm length assessment interval are obtained from the database and marked as control three-dimensional vascular models.

[0021] In a preferred embodiment, the step of obtaining the vascular similarity between the target three-dimensional vascular model and a plurality of reference three-dimensional vascular models, obtaining the reference three-dimensional vascular model that meets the preset conditions according to the vascular similarity, and marking it as a similar three-dimensional vascular model comprises:

[0022] Acquire multiple viewpoint plane model data of the target three-dimensional blood vessel model, construct a plane rectangular coordinate system in each viewpoint plane model data, and acquire coordinate points of the blood vessel contour in the corresponding multiple viewpoint plane model data according to the plane rectangular coordinate system, and mark them as a target blood vessel contour coordinate point set;

[0023] Acquire multiple viewing angle plane model data of each reference three-dimensional blood vessel model, construct a plane rectangular coordinate system in each viewing angle plane model data, and acquire coordinate points of the blood vessel contour in the corresponding multiple viewing angle plane model data according to the plane rectangular coordinate system, and mark them as a reference blood vessel contour coordinate point set;

[0024] According to the target blood vessel contour coordinate point set, the number of the corresponding target view angle, the total number of target view angles, multiple target blood vessel contour coordinate points in each target view angle, the number of the target blood vessel contour coordinate points in each target view angle, and the total number of the target blood vessel contour coordinate points in each target view angle are obtained;

[0025] According to the set of control blood vessel contour coordinate points, the number of the corresponding control viewing angle, the total number of control viewing angles, multiple control blood vessel contour coordinate points in each control viewing angle, the number of the control blood vessel contour coordinate points in each control viewing angle, and the total number of the control blood vessel contour coordinate points in each control viewing angle are obtained;

[0026] The blood vessel similarity between each control three-dimensional blood vessel model and the target three-dimensional blood vessel model is calculated according to the number of the target view angle, the total number of the target view angle, the multiple target blood vessel contour coordinate points in each target view angle, the number of the target blood vessel contour coordinate points in each target view angle, the total number of the target blood vessel contour coordinate points in each target view angle, the number of the control view angle, the total number of the control view angle, the multiple control blood vessel contour coordinate points in each control view angle, the number of the control blood vessel contour coordinate points in each control view angle, and the total number of the control blood vessel contour coordinate points in each control view angle, wherein the calculation formula is:

[0027]

[0028] Where S represents the blood vessel similarity, i represents the number of the target view and the number of the control view, n represents the total number of the target view and the total number of the control view, g represents the number of multiple target blood vessel contour coordinate points in each target view, h represents the total number of multiple target blood vessel contour coordinate points in each target view, and M g Represented as the x-axis coordinate point of the g-th target blood vessel contour within each target viewing angle, M g+1 It is represented by the x-axis coordinate point of the g+1th target blood vessel contour in each target viewing angle, B g It is represented by the y-axis coordinate point of the g-th target blood vessel contour in each target viewing angle, B g+1represents the g+1th target blood vessel contour y-axis coordinate point in each target view, u represents the number of multiple control blood vessel contour coordinate points in each control view, p represents the total number of control blood vessel contour coordinate points in each control view, and D u It is represented by the x-axis coordinate point of the u-th control blood vessel contour in each control view, D u+1 It is represented by the x-axis coordinate point of the u+1th control blood vessel contour in each control view, Z u It is represented by the y-axis coordinate point of the u-th control vessel contour in each control view, Z u+1 It is represented by the y-axis coordinate point of the u+1th control blood vessel contour in each control viewing angle.

[0029] In a preferred embodiment, the step of obtaining a reference three-dimensional vascular model that meets preset conditions according to the vascular similarity and marking it as a similar three-dimensional vascular model includes:

[0030] Obtaining a blood vessel similarity threshold;

[0031] Determine whether the blood vessel similarity exceeds a blood vessel similarity threshold;

[0032] If the vascular similarity exceeds the vascular similarity threshold, the control 3D vascular model is determined to be similar to the target 3D vascular model, and the vascular similarities that meet the similarity criteria are arranged in order from high to low, and the control 3D vascular model corresponding to the highest vascular similarity is selected and marked as a similar 3D vascular model;

[0033] If the blood vessel similarity does not exceed the blood vessel similarity threshold, it is determined whether the reference three-dimensional blood vessel model is similar to the target three-dimensional blood vessel model.

[0034] In a preferred embodiment, the step of obtaining a similarity compensation value according to the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model comprises:

[0035] Obtaining standard blood vessel similarity;

[0036] The similarity compensation value is calculated according to the standard blood vessel similarity and the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model, wherein the calculation formula is:

[0037]

[0038] In the formula, S a Expressed as similarity compensation value, S x Expressed as similarity compensation value, S b Expressed as standard vessel similarity.

[0039] In a preferred embodiment, the step of obtaining the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model, and obtaining the puncture compensation value according to the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model comprises:

[0040] Acquiring a puncture position in a target three-dimensional blood vessel model and a puncture position in a similar three-dimensional blood vessel model;

[0041] Recombining the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model into a combined three-dimensional blood vessel model, wherein the combined three-dimensional blood vessel model includes a puncture position of the similar three-dimensional blood vessel model and a puncture position of the target three-dimensional blood vessel model;

[0042] A linear coordinate system is established in the combined three-dimensional vascular model, wherein the origin of the linear coordinate system is the puncture position of the similar three-dimensional vascular model, and the negative direction of the linear coordinate system is the direction from the vein of the peripheral arm to the superior vena cava of the heart area;

[0043] The puncture compensation value is obtained according to the coordinate point of the puncture position of the target three-dimensional blood vessel model in the linear coordinate system.

[0044] In a preferred embodiment, the step of obtaining the patient's arm circumference data, body fat percentage, and vascular elasticity value, obtaining the corresponding arm circumference data, body fat percentage, and vascular elasticity value according to the similar three-dimensional vascular model, and obtaining the arm circumference compensation value, body fat compensation value, and vascular elasticity compensation value according to the patient's arm circumference data, body fat percentage, and vascular elasticity value and the arm circumference data, body fat percentage, and vascular elasticity value corresponding to the similar three-dimensional vascular model, respectively, includes:

[0045] Obtain the patient's arm circumference data, body fat percentage, and vascular elasticity value, and mark them as target arm circumference data, target body fat percentage, and target vascular elasticity value, respectively;

[0046] According to the similar three-dimensional vascular model, the corresponding arm circumference data, body fat percentage and vascular elasticity value are obtained, and are marked as similar arm circumference data, similar body fat percentage and similar vascular elasticity value respectively;

[0047] According to the target arm circumference data, a plurality of corresponding target arm circumference values, a total number of target arm circumference values ​​and serial numbers of the target arm circumference values ​​are obtained;

[0048] According to the similar arm circumference data, a corresponding plurality of similar arm circumference values, a total number of similar arm circumference values ​​and serial numbers of the similar arm circumference values ​​are obtained;

[0049] The arm circumference compensation value is calculated according to multiple target arm circumference values ​​and multiple similar arm circumference values, wherein the calculation formula is:

[0050]

[0051] Where W ais represented by the arm circumference compensation value, j is represented by the number of the ratio of the target arm circumference value to the similar arm circumference value, j is represented by the total number of the ratio of the target arm circumference value to the similar arm circumference value, W m Expressed as the target arm circumference, W s Expressed as similar arm circumference values, It is expressed as the ratio of the jth target arm circumference value to the similar arm circumference value;

[0052] The body fat compensation value is calculated based on the target body fat percentage and the similar body fat percentage, where the calculation formula is:

[0053]

[0054] Where, T a Expressed as body fat compensation value, T m Expressed as target body fat percentage, T s Expressed as similar body fat percentage;

[0055] The vascular elasticity compensation value is calculated according to the target vascular elasticity value and the similar vascular elasticity value, wherein the calculation formula is:

[0056]

[0057] Where, X a Expressed as vascular elasticity compensation value, X m Expressed as the target vascular elasticity value, X s Expressed as similar vascular elasticity values.

[0058] In a preferred embodiment, the step of obtaining the length of the corresponding PICC catheter according to the similar three-dimensional vascular model, and obtaining the length of the patient's PICC catheter according to the arm circumference compensation value, the body fat compensation value, the vascular elasticity compensation value, the similarity compensation value, the puncture compensation value and the length of the PICC catheter corresponding to the similar three-dimensional vascular model includes:

[0059] The length of the corresponding PICC catheter is obtained according to the similar three-dimensional blood vessel model and marked as the similar PICC catheter length;

[0060] The patient's PICC catheter length is calculated based on the arm circumference compensation value, body fat compensation value, vascular elasticity compensation value, similarity compensation value, puncture compensation value and similar PICC catheter length, where the calculation formula is:

[0061] C h =C s ·(S a +W a ·T a ·X a )+J a ;

[0062] In the formula, Ca Expressed as similar PICC catheter length, S a Expressed as similarity compensation value, W a Expressed as arm circumference compensation value, T a Expressed as body fat compensation value, X a Expressed as vascular elasticity compensation value, J a Expressed as puncture compensation value.

[0063] In a preferred embodiment, the step of acquiring the tip position of the PICC catheter according to the patient's PICC catheter length and the target three-dimensional blood vessel model comprises:

[0064] Obtain the length and tip position of the PICC catheter in a similar three-dimensional vascular model;

[0065] A spatial coordinate system is constructed according to the position of the PICC catheter tip in the similar three-dimensional blood vessel model, wherein the origin of the spatial coordinate system is the position of the PICC catheter tip in the similar three-dimensional blood vessel model;

[0066] The PICC tip difference is obtained based on the patient's PICC length and the PICC length and tip position in a similar three-dimensional vascular model;

[0067] The coordinate point is obtained in the spatial coordinate system according to the difference of the PICC catheter tip, and the position of the PICC catheter tip of the target patient is obtained in the spatial coordinate system according to the coordinate point in the similar three-dimensional blood vessel model.

[0068] And, a terminal for measuring the length and positioning the tip of a PICC catheter based on mixed reality technology, comprising:

[0069] one or more processors;

[0070] a storage device having one or more programs stored thereon;

[0071] When the one or more programs are executed by the one or more processors, the one or more processors implement the method of PICC catheter length measurement and tip positioning based on mixed reality technology.

[0072] The technical effects achieved by the present invention are:

[0073] The present invention can accurately measure and correct the length of the PICC catheter by combining the patient's three-dimensional vascular model with multiple control models in the database, thereby improving the accuracy and safety of the catheter. Taking into account the patient's individualized data such as arm circumference, body fat percentage and vascular elasticity, the PICC catheter length is more in line with individual physiological characteristics, thereby improving the treatment effect. By using mixed reality technology, the catheter position can be acquired and adjusted in real time, avoiding errors that may occur in traditional methods. Accurate catheter length and tip positioning reduce possible complications during PICC catheterization, such as vascular puncture and thrombosis. The personalized and precise catheterization method reduces the intrusion on the patient and improves the patient's comfort and satisfaction. Through automated data processing and model matching, the operation process of medical staff is simplified and work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 It is a flow chart of the method provided by the present invention. DETAILED DESCRIPTION

[0075] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0076] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0077] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0078] Secondly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the schematic diagrams are only examples and should not limit the scope of protection of the present invention.

[0079] Please see attached Figure 1 As shown, a method for measuring the length of a PICC catheter and positioning its tip based on mixed reality technology is provided, including:

[0080] S1, collecting image data of the superior vena cava from the vein of the patient's peripheral arm to the heart area, constructing a three-dimensional vascular model of the patient according to the image data, and marking it as a target three-dimensional vascular model;

[0081] S2, obtaining three-dimensional vascular models of multiple PICC catheters in the database and marking them as control three-dimensional vascular models;

[0082] S3, obtaining blood vessel similarity between the target three-dimensional blood vessel model and multiple reference three-dimensional blood vessel models;

[0083] S4, obtaining a control three-dimensional vascular model that meets preset conditions according to the vascular similarity, and marking it as a similar three-dimensional vascular model;

[0084] S5, obtaining a similarity compensation value according to the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model;

[0085] S6, obtaining a puncture position in the target three-dimensional blood vessel model and a puncture position in a similar three-dimensional blood vessel model, and obtaining a puncture compensation value according to the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model;

[0086] S7, obtaining the patient's arm circumference data, body fat percentage, and vascular elasticity value, obtaining the corresponding arm circumference data, body fat percentage, and vascular elasticity value according to the similar three-dimensional vascular model, and obtaining the arm circumference compensation value, body fat compensation value, and vascular elasticity compensation value respectively according to the patient's arm circumference data, body fat percentage, and vascular elasticity value and the arm circumference data, body fat percentage, and vascular elasticity value corresponding to the similar three-dimensional vascular model;

[0087] S8, obtaining the corresponding PICC catheter length according to the similar three-dimensional vascular model, and obtaining the patient's PICC catheter length according to the arm circumference compensation value, the body fat compensation value, the vascular elasticity compensation value, the similarity compensation value, the puncture compensation value, and the PICC catheter length corresponding to the similar three-dimensional vascular model;

[0088] S9. Obtain the tip position of the PICC catheter according to the patient's PICC catheter length and the target three-dimensional vascular model.

[0089] As in the above steps S1 to S9, an imaging technique (such as CT, MRI or ultrasound) is used to obtain the patient's venous image, and a three-dimensional vascular model is constructed to accurately describe the morphology and position of the blood vessels. Existing PICC catheter three-dimensional vascular models are extracted from the database. These models are used as controls for comparison with the patient's target three-dimensional vascular model. By calculating the similarity between the target three-dimensional vascular model and the control three-dimensional vascular model, it is determined which control models are most similar to the patient's vascular model, and the control models with high similarity to the target three-dimensional vascular model are screened out as similar three-dimensional vascular models. The difference between the target model and the similar model is calculated to obtain a compensation value for adjusting the catheter length. The puncture positions in the target model and the similar model are compared, the position difference is calculated, and the puncture compensation value is obtained. The patient's arm circumference, body fat percentage, and vascular elasticity value are measured and compared with the data of the similar three-dimensional vascular model to obtain the corresponding compensation value. The similar model is adjusted based on the various compensation values. The final catheter length of the patient is obtained by calculating the final calculated catheter length and the target three-dimensional vascular model, and the tip position of the catheter is determined by combining the patient's three-dimensional vascular model with multiple control models in the database. The length of the PICC catheter can be accurately measured and corrected, thereby improving the accuracy and safety of the catheter. Taking into account the patient's individualized data such as arm circumference, body fat percentage, and vascular elasticity, the PICC catheter length is more in line with individual physiological characteristics, improving the treatment effect. Using mixed reality technology, the catheter position can be obtained and adjusted in real time to avoid errors that may occur in traditional methods. Accurate catheter length and tip positioning reduce possible complications during PICC catheterization, such as vascular puncture and thrombosis. The personalized and precise catheterization method reduces the intrusion on patients and improves their comfort and satisfaction. Through automated data processing and model matching, the operation process of medical staff is simplified and work efficiency is improved.

[0090] In a preferred embodiment, the step of obtaining a plurality of three-dimensional vascular models of PICC catheters in a database and marking them as reference three-dimensional vascular models includes:

[0091] S201, collecting patient arm length data;

[0092] S202, constructing an arm length assessment interval according to the patient's arm length data;

[0093] S203, obtaining from the database a plurality of three-dimensional vascular models of PICC catheters corresponding to the arm length data within the arm length assessment interval, and marking them as control three-dimensional vascular models.

[0094] As in the above steps S201 to S203, the patient's arm length data is measured or obtained from the patient's electronic health record, and a reasonable evaluation interval is constructed based on the patient's arm length data. This evaluation interval can be a specific range (for example, arm length ± a certain value) or an interval determined by a statistical method (such as standard deviation). A plurality of PICC catheterization three-dimensional vascular models whose arm length data conform to the evaluation interval are screened out from the database, and these screened out three-dimensional vascular models are marked as control three-dimensional vascular models. By screening the control model based on the arm length data, it can be ensured that the selected control three-dimensional vascular model is closer to the patient's actual physiological condition, thereby improving the accuracy of subsequent analysis and matching. Arm length is an important individual Characteristics. By considering this data, personalized medical treatment can be better achieved, and the accuracy and effect of catheterization can be improved. The construction and application of arm length assessment intervals can help exclude models that are significantly different from the patient's arm length and reduce errors caused by individual differences, thereby improving the accuracy of PICC catheter length measurement. By constructing arm length assessment intervals, existing data in the database can be more effectively utilized, the application value of data can be improved, and the development of medical technology based on big data can be promoted. By accurately matching control models with similar arm lengths, potential risks can be better predicted and avoided, and the safety and effectiveness of PICC catheterization can be improved. Through the collection and evaluation of arm length data, scientific and precise medical decisions can be made, which helps to improve the overall medical level.

[0095] In a preferred embodiment, the step of obtaining the vascular similarity between the target three-dimensional vascular model and a plurality of reference three-dimensional vascular models, obtaining the reference three-dimensional vascular model that meets the preset conditions according to the vascular similarity, and marking it as a similar three-dimensional vascular model comprises:

[0096] S301, acquiring multiple viewpoint plane model data of a target three-dimensional blood vessel model, constructing a plane rectangular coordinate system in each viewpoint plane model data, and acquiring coordinate points of blood vessel contours in the corresponding multiple viewpoint plane model data according to the plane rectangular coordinate system, and marking them as a target blood vessel contour coordinate point set;

[0097] S302, obtaining multiple viewing angle plane model data of each reference three-dimensional blood vessel model, constructing a plane rectangular coordinate system in each viewing angle plane model data, and obtaining coordinate points of the blood vessel contour in the corresponding multiple viewing angle plane model data according to the plane rectangular coordinate system, and marking them as a reference blood vessel contour coordinate point set;

[0098] S303, acquiring, according to the target blood vessel contour coordinate point set, the number of the corresponding target view angle, the total number of target view angles, multiple target blood vessel contour coordinate points in each target view angle, the number of the target blood vessel contour coordinate points in each target view angle, and the total number of the target blood vessel contour coordinate points in each target view angle;

[0099] S304, acquiring, according to the set of control blood vessel contour coordinate points, the number of the corresponding control viewing angle, the total number of control viewing angles, a plurality of control blood vessel contour coordinate points in each control viewing angle, the number of the control blood vessel contour coordinate points in each control viewing angle, and the total number of the control blood vessel contour coordinate points in each control viewing angle;

[0100] S305, calculating the blood vessel similarity between each reference 3D blood vessel model and the target 3D blood vessel model according to the number of the target view angle, the total number of the target view angles, the multiple target blood vessel contour coordinate points in each target view angle, the number of the target blood vessel contour coordinate points in each target view angle, the total number of the target blood vessel contour coordinate points in each target view angle, the number of the control view angle, the total number of the control view angle, the multiple control blood vessel contour coordinate points in each control view angle, the number of the control blood vessel contour coordinate points in each control view angle, and the total number of the control blood vessel contour coordinate points in each control view angle, wherein the calculation formula is:

[0101]

[0102] Where S represents the blood vessel similarity, i represents the number of the target view and the number of the control view, n represents the total number of the target view and the total number of the control view, g represents the number of multiple target blood vessel contour coordinate points in each target view, h represents the total number of multiple target blood vessel contour coordinate points in each target view, and M g Represented as the x-axis coordinate point of the g-th target blood vessel contour within each target viewing angle, M g+1 It is represented by the x-axis coordinate point of the g+1th target blood vessel contour in each target viewing angle, B g It is represented by the y-axis coordinate point of the g-th target blood vessel contour in each target viewing angle, B g+1 represents the g+1th target blood vessel contour y-axis coordinate point in each target view, u represents the number of multiple control blood vessel contour coordinate points in each control view, p represents the total number of control blood vessel contour coordinate points in each control view, and D u It is represented by the x-axis coordinate point of the u-th control blood vessel contour in each control view, D u+1 It is represented by the x-axis coordinate point of the u+1th control blood vessel contour in each control view, Z u It is represented by the y-axis coordinate point of the u-th control vessel contour in each control view, Z u+1 It is represented by the y-axis coordinate point of the u+1th control blood vessel contour in each control viewing angle.

[0103] As in the above steps S301 to S305, multiple viewpoint plane model data of the target three-dimensional vascular model are obtained, a plane rectangular coordinate system is constructed in each viewpoint plane model data, coordinate points of the vascular contour in the multiple viewpoint plane model data are obtained according to the plane rectangular coordinate system, and are marked as a set of target vascular contour coordinate points, multiple viewpoint plane model data of each control three-dimensional vascular model are obtained, a plane rectangular coordinate system is constructed in each viewpoint plane model data, coordinate points of the vascular contour in the multiple viewpoint plane model data are obtained according to the plane rectangular coordinate system, and are marked as a set of control vascular contour coordinate points, the number of the target viewpoint, the total number of target viewpoints, multiple target vascular contour coordinate points in each target viewpoint, the number of the target vascular contour coordinate points in each target viewpoint, and the total number of the target vascular contour coordinate points in each target viewpoint, the number of the control viewpoint, the total number of the control viewpoints, multiple control vascular contour coordinate points in each control viewpoint, the number of the control vascular contour coordinate points in each control viewpoint, and the number of the control vascular contour coordinate points in each control viewpoint. The total number of coordinate points of the reference vascular contour within the viewing angle is compared with the corresponding information of the reference view according to the number and total number of the target view, the multiple vascular contour coordinate points in each view and their numbers and total number, and the vascular similarity between each reference 3D vascular model and the target 3D vascular model is calculated. By acquiring multi-view plane model data and extracting accurate coordinate points, the morphological characteristics of the blood vessels can be described in detail, thereby providing more accurate basic data for similarity calculation. When calculating the similarity, the vascular contour data of multiple views are comprehensively considered, which can fully reflect the similarity of vascular structure and avoid errors caused by a single view. Through detailed view number and coordinate point number information, the vascular contour can be accurately matched and compared, and the accuracy of screening similar vascular models can be improved to ensure the high similarity between the selected reference model and the target model. The accurate vascular similarity calculation and screening mechanism can provide a reliable basis for subsequent PICC catheter length measurement and tip positioning, reduce operational risks, and enhance the reliability and safety of the catheterization process.

[0104] In a preferred embodiment, the step of obtaining a reference three-dimensional vascular model that meets preset conditions according to the vascular similarity and marking it as a similar three-dimensional vascular model includes:

[0105] S401, obtaining a blood vessel similarity threshold;

[0106] S402, determining whether the blood vessel similarity exceeds a blood vessel similarity threshold;

[0107] If the vascular similarity exceeds the vascular similarity threshold, the control 3D vascular model is determined to be similar to the target 3D vascular model, and the vascular similarities that meet the similarity criteria are arranged in order from high to low, and the control 3D vascular model corresponding to the highest vascular similarity is selected and marked as a similar 3D vascular model;

[0108] If the blood vessel similarity does not exceed the blood vessel similarity threshold, it is determined whether the reference three-dimensional blood vessel model is similar to the target three-dimensional blood vessel model.

[0109] As in the above steps S401 to S402, a threshold for judging the similarity of the vascular models is determined. The threshold is a preset value used to measure the degree of similarity between the two vascular models in morphology. The calculated vascular similarity is compared with the preset vascular similarity threshold. If the vascular similarity exceeds the preset vascular similarity threshold, the reference 3D vascular model is judged to be similar to the target 3D vascular model. All vascular similarities that meet the similarity criteria are arranged in descending order, and the reference 3D vascular model corresponding to the highest vascular similarity is selected and marked as a similar 3D vascular model. If the vascular similarity does not exceed the preset vascular similarity threshold, the reference 3D vascular model is judged to be similar to the target 3D vascular model. By setting the vascular similarity threshold, the control 3D vascular model that is highly similar to the target 3D vascular model can be effectively screened out, thereby improving the accuracy and reliability of the screening process. By sorting the similarities of the blood vessels that meet the similarity criteria, the most similar control 3D vascular model can be quickly identified, providing the best reference model for subsequent catheterization operations. It can help medical staff quickly find a model that is highly similar to the patient's vascular structure in a complex clinical environment, thereby making more accurate catheterization decisions and improving the success rate and safety of clinical operations. Accurate similarity model screening can reduce the operational risks caused by model mismatch, reduce potential complications during catheterization, and ensure patient safety.

[0110] In a preferred embodiment, the step of obtaining a similarity compensation value according to the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model comprises:

[0111] S501, obtaining standard blood vessel similarity;

[0112] S502, calculating a similarity compensation value according to the standard blood vessel similarity and the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model, wherein the calculation formula is:

[0113]

[0114] In the formula, S a Expressed as similarity compensation value, S x Expressed as similarity compensation value, S b Expressed as standard vessel similarity.

[0115] As in the above steps S501 to S502, the standard vascular similarity is determined, which is a pre-set reference value used to measure the similarity of two vascular models under ideal conditions, obtain the actual vascular similarity between the target three-dimensional vascular model and the similar three-dimensional vascular model, and calculate the similarity compensation value according to the above formula. This calculation method is used to measure the difference between the actual vascular model and other patients or clinical vascular models, thereby obtaining the similarity compensation value. By comparing the standard vascular similarity with the actual vascular similarity, the difference between the target three-dimensional vascular model and the similar three-dimensional vascular model can be accurately measured to provide a scientific basis. The calculated similarity compensation value can quantify the difference between the models and provide specific data support for the subsequent PICC catheter length and position adjustment. Through the calculation of the similarity compensation value, personalized adjustments can be made according to the specific situation of each patient to ensure the accuracy and safety of PICC catheterization. The introduction of the similarity compensation value enables the catheterization process to better adapt to individual differences, reduce errors caused by model mismatch, and improve the accuracy of catheterization.

[0116] In a preferred embodiment, the step of obtaining the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model, and obtaining the puncture compensation value according to the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model comprises:

[0117] S601, obtaining a puncture position in a target three-dimensional blood vessel model and a puncture position in a similar three-dimensional blood vessel model;

[0118] S602, recombining the target 3D blood vessel model and the similar 3D blood vessel model into a combined 3D blood vessel model, wherein the combined 3D blood vessel model includes the puncture position of the similar 3D blood vessel model and the puncture position of the target 3D blood vessel model;

[0119] S603, establishing a linear coordinate system in the combined three-dimensional blood vessel model, wherein the origin of the linear coordinate system is the puncture position of the similar three-dimensional blood vessel model, and the negative direction of the linear coordinate system is the direction from the vein of the peripheral arm to the superior vena cava of the heart area;

[0120] S604: Obtain a puncture compensation value according to the coordinate point of the puncture position of the target three-dimensional blood vessel model in the linear coordinate system.

[0121] As in the above steps S601 to S604, the puncture positions in the target three-dimensional vascular model and the similar three-dimensional vascular model are obtained, and the target three-dimensional vascular model and the similar three-dimensional vascular model are recombined into a combined three-dimensional vascular model, which includes the puncture position of the similar three-dimensional vascular model and the puncture position of the target three-dimensional vascular model. A linear coordinate system is established, and the origin of the linear coordinate system is set to the puncture position of the similar three-dimensional vascular model. The negative direction of the linear coordinate system is defined as the direction from the peripheral arm vein to the superior vena cava of the heart area. According to the coordinate point of the puncture position of the target three-dimensional vascular model in the linear coordinate system, its compensation value relative to the puncture position of the similar three-dimensional vascular model is calculated. By obtaining and comparing the puncture positions of the target three-dimensional vascular model and the similar three-dimensional vascular model, it is possible to accurately Identify subtle differences in puncture positions and ensure the accuracy of puncture operations. The reorganized combined three-dimensional vascular model provides an intuitive reference framework, allowing medical staff to clearly see the similarities and differences between the two models, facilitating decision-making. By establishing a linear coordinate system with the puncture position of similar three-dimensional vascular models as the origin, a standardized reference system is provided to facilitate precise calculations and comparisons. By calculating the coordinate point of the target puncture position in the linear coordinate system, a clear puncture compensation value can be obtained, providing a specific adjustment basis for clinical operations. Accurate puncture compensation values ​​can help medical staff make more detailed adjustments during PICC catheterization, reduce complications caused by improper puncture positions, and improve the success rate of catheterization and patient safety.

[0122] In a preferred embodiment, the step of obtaining the patient's arm circumference data, body fat percentage, and vascular elasticity value, obtaining the corresponding arm circumference data, body fat percentage, and vascular elasticity value according to the similar three-dimensional vascular model, and obtaining the arm circumference compensation value, body fat compensation value, and vascular elasticity compensation value according to the patient's arm circumference data, body fat percentage, and vascular elasticity value and the arm circumference data, body fat percentage, and vascular elasticity value corresponding to the similar three-dimensional vascular model, respectively, includes:

[0123] S701, obtaining the patient's arm circumference data, body fat percentage, and vascular elasticity value, and marking them as target arm circumference data, target body fat percentage, and target vascular elasticity value, respectively;

[0124] S702, obtaining corresponding arm circumference data, body fat percentage, and vascular elasticity value according to the similar three-dimensional vascular model, and marking them as similar arm circumference data, similar body fat percentage, and similar vascular elasticity value, respectively;

[0125] S703, acquiring a plurality of corresponding target arm circumference values, a total number of target arm circumference values, and numbers of the target arm circumference values ​​according to the target arm circumference data;

[0126] S704, acquiring a plurality of corresponding similar arm circumference values, a total number of similar arm circumference values ​​and serial numbers of similar arm circumference values ​​according to the similar arm circumference data;

[0127] S705, calculating an arm circumference compensation value according to a plurality of target arm circumference values ​​and a plurality of similar arm circumference values, wherein the calculation formula is:

[0128]

[0129] Where W a is represented by the arm circumference compensation value, j is represented by the number of the ratio of the target arm circumference value to the similar arm circumference value, j is represented by the total number of the ratio of the target arm circumference value to the similar arm circumference value, W m Expressed as the target arm circumference, W s Expressed as similar arm circumference values, It is expressed as the ratio of the jth target arm circumference value to the similar arm circumference value;

[0130] S706: Calculate the body fat compensation value according to the target body fat percentage and the similar body fat percentage, wherein the calculation formula is:

[0131]

[0132] Where, T a Expressed as body fat compensation value, T m Expressed as target body fat percentage, T s Expressed as similar body fat percentage;

[0133] S707, calculating a vascular elasticity compensation value according to the target vascular elasticity value and the similar vascular elasticity value, wherein the calculation formula is:

[0134]

[0135] Where, X a Expressed as vascular elasticity compensation value, X m Expressed as the target vascular elasticity value, X s Expressed as similar vascular elasticity values.

[0136] As in the above steps S701 to S707, the patient's arm circumference data, body fat percentage and vascular elasticity value are obtained, and are marked as target arm circumference data, target body fat percentage and target vascular elasticity value, respectively; the corresponding arm circumference data, body fat percentage and vascular elasticity value are obtained according to the similar three-dimensional vascular model, and are marked as similar arm circumference data, similar body fat percentage and similar vascular elasticity value, respectively; according to the target arm circumference data, multiple target arm circumference values, the total number of target arm circumference values ​​and the serial numbers of the target arm circumference values ​​are extracted; according to the similar arm circumference data, multiple similar arm circumference values, the total number of similar arm circumference values ​​and the serial numbers of the similar arm circumference values ​​are extracted; according to the multiple target arm circumference values ​​and the multiple similar arm circumference values, the arm circumference compensation value is calculated; according to the target body fat percentage and the similar body fat percentage, the body fat compensation value is calculated; based on the The vascular elasticity compensation value is calculated based on the target vascular elasticity value and similar vascular elasticity values. By refining the extraction and comparison process of target and similar data, the calculation of each compensation value is ensured to be accurate and reliable, providing a specific adjustment basis for subsequent operations. Data in multiple dimensions such as arm circumference, body fat percentage and vascular elasticity value are taken into consideration, and the individual differences of patients are comprehensively evaluated to ensure the comprehensiveness and accuracy of the compensation value. By calculating the compensation value, personalized adjustments can be made to the specific physiological parameters of each patient, the length and position of the PICC catheter can be optimized, and the success rate and safety of the operation can be improved. Accurate compensation values ​​can help medical staff make more detailed adjustments during the PICC catheterization process, reduce errors caused by physiological differences, and improve the accuracy of catheterization.

[0137] In a preferred embodiment, the step of obtaining the length of the corresponding PICC catheter according to the similar three-dimensional vascular model, and obtaining the length of the patient's PICC catheter according to the arm circumference compensation value, the body fat compensation value, the vascular elasticity compensation value, the similarity compensation value, the puncture compensation value and the length of the PICC catheter corresponding to the similar three-dimensional vascular model includes:

[0138] S801, obtaining the corresponding PICC catheter length according to the similar three-dimensional blood vessel model, and marking it as a similar PICC catheter length;

[0139] S802, calculating the patient's PICC catheter length according to the arm circumference compensation value, body fat compensation value, vascular elasticity compensation value, similarity compensation value, puncture compensation value and similar PICC catheter length, wherein the calculation formula is:

[0140] C h =C s ·(S a +W a ·T a ·X a )+J a ;

[0141] In the formula, C a Expressed as similar PICC catheter length, S aExpressed as similarity compensation value, W a Expressed as arm circumference compensation value, T a Expressed as body fat compensation value, X a Expressed as vascular elasticity compensation value, J a Expressed as puncture compensation value.

[0142] As in the above steps S801 to S802, the corresponding PICC catheter length is obtained according to the similar three-dimensional vascular model and marked as the similar PICC catheter length, and the arm circumference compensation value, body fat compensation value, vascular elasticity compensation value, similarity compensation value and puncture compensation value are used to adjust the similar PICC catheter length to obtain the patient's PICC catheter length. By considering the patient's individual characteristics (such as arm circumference, body fat percentage, vascular elasticity, etc.) and various compensation factors during the operation, a PICC catheter length that is closer to the patient's actual situation is obtained, thereby improving the accuracy and safety of catheterization. Based on the similar PICC catheter length and combined with a variety of compensation values ​​for adjustment, it can be more scientific. The final catheter length can be scientifically determined to avoid relying solely on a single measurement or estimation method. Accurate catheter length calculation can reduce the risk of complications caused by too long or too short catheterization, such as thrombosis, improper catheterization position, etc., improve treatment effects and patient comfort, and provide standardized calculation processes and compensation value application methods, so that medical staff can adjust the length more quickly and accurately in actual operations, improve work efficiency and catheterization success rate. Through the application of unified calculation standards and compensation values, it can ensure that the patient's PICC catheter length remains consistent under different medical environments and medical staff operations, which is conducive to the stability of treatment results and the realization of expected effects.

[0143] In a preferred embodiment, the step of obtaining the tip position of the PICC catheter according to the patient's PICC catheter length and the target three-dimensional blood vessel model includes:

[0144] S901, obtaining the length and tip position of the PICC catheter in a similar three-dimensional blood vessel model;

[0145] S902, constructing a spatial coordinate system according to the position of the PICC catheter tip in the similar three-dimensional blood vessel model, wherein the origin of the spatial coordinate system is the position of the PICC catheter tip in the similar three-dimensional blood vessel model;

[0146] S903, obtaining a PICC catheter tip difference according to the patient's PICC catheter length and the PICC catheter length and tip position in a similar three-dimensional blood vessel model;

[0147] S904, obtaining a coordinate point in a spatial coordinate system according to the PICC catheter tip difference, and obtaining a position of the PICC catheter tip of the target patient in a spatial coordinate system according to the coordinate point in a similar three-dimensional blood vessel model.

[0148] As in steps S901 to S904 above, the known PICC catheter length and its tip position are obtained from the similar three-dimensional vascular model. In the similar three-dimensional vascular model, a spatial coordinate system is established with the similar PICC catheter tip position as the origin. The length difference is calculated based on the patient's PICC catheter length and the PICC catheter length in the similar three-dimensional vascular model. The length difference is used to adjust the PICC catheter tip position in the similar three-dimensional vascular model to obtain a new tip position. The tip difference is obtained based on the new tip position and the original tip position. According to the calculated tip difference, the corresponding coordinate point is obtained in the spatial coordinate system, and the coordinate point is mapped back to the spatial coordinate system of the similar three-dimensional vascular model to obtain the target patient's PICC catheter tip position. Based on the catheter length and tip position of the similar three-dimensional vascular model, combined with the actual The patient's catheter length information can be used to accurately calculate the patient's actual PICC catheter tip position, avoid the risk of complications caused by too deep or too shallow catheterization, adjust the tip position according to the patient's individual characteristics and specific circumstances, ensure that the PICC catheter is properly positioned in the blood vessel, and help improve the treatment effect and patient comfort. By accurately determining the PICC catheter tip position, the need for reoperation or adjustment due to inaccurate catheter position can be reduced, saving medical resources and patient time. Determining the appropriate PICC catheter tip position can reduce the risk of complications such as thrombosis and phlebitis, thereby improving the safety and success rate of the treatment process. It provides standardized calculation methods and coordinate system settings, allowing medical staff to determine the PICC catheter tip position more quickly and accurately in actual operations, thereby improving work efficiency and patient satisfaction.

[0149] And, a terminal for measuring the length and positioning the tip of a PICC catheter based on mixed reality technology, comprising:

[0150] one or more processors;

[0151] a storage device having one or more programs stored thereon;

[0152] When the one or more programs are executed by the one or more processors, the one or more processors implement the method of PICC catheter length measurement and tip positioning based on mixed reality technology.

[0153] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A terminal for measuring the length of a PICC catheter and locating its tip based on mixed reality technology, characterized in that: include: one or more processors; a storage device having one or more programs stored thereon; When the one or more programs are executed by the one or more processors, the one or more processors implement a method for measuring the length of a PICC catheter and locating its tip based on mixed reality technology, including: Collect image data of the superior vena cava from the patient's peripheral arm vein to the heart area, build a three-dimensional vascular model of the patient based on the image data, and mark it as a target three-dimensional vascular model; Acquire multiple 3D vascular models of PICC catheters in the database and mark them as control 3D vascular models; obtaining blood vessel similarities between a target three-dimensional blood vessel model and a plurality of reference three-dimensional blood vessel models; According to the vascular similarity, a control three-dimensional vascular model that meets the preset conditions is obtained and marked as a similar three-dimensional vascular model; Acquire a similarity compensation value according to the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model; Acquire the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model, and acquire the puncture compensation value according to the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model; Obtain the patient's arm circumference data, body fat percentage, and vascular elasticity value, obtain the corresponding arm circumference data, body fat percentage, and vascular elasticity value according to the similar three-dimensional vascular model, and obtain the arm circumference compensation value, body fat compensation value, and vascular elasticity compensation value respectively according to the patient's arm circumference data, body fat percentage, and vascular elasticity value and the arm circumference data, body fat percentage, and vascular elasticity value corresponding to the similar three-dimensional vascular model; The length of the corresponding PICC catheter is obtained according to the similar three-dimensional vascular model, and the length of the PICC catheter of the patient is obtained according to the arm circumference compensation value, the body fat compensation value, the vascular elasticity compensation value, the similarity compensation value, the puncture compensation value and the length of the PICC catheter corresponding to the similar three-dimensional vascular model; The tip position of the PICC catheter is obtained based on the patient's PICC catheter length and the target three-dimensional vascular model; The step of obtaining the vascular similarity between the target three-dimensional vascular model and a plurality of reference three-dimensional vascular models, obtaining a reference three-dimensional vascular model that meets preset conditions according to the vascular similarity, and marking the model as a similar three-dimensional vascular model includes: Acquire multiple viewpoint plane model data of the target three-dimensional blood vessel model, construct a plane rectangular coordinate system in each viewpoint plane model data, and acquire coordinate points of the blood vessel contour in the corresponding multiple viewpoint plane model data according to the plane rectangular coordinate system, and mark them as a target blood vessel contour coordinate point set; Acquire multiple viewing angle plane model data of each reference three-dimensional blood vessel model, construct a plane rectangular coordinate system in each viewing angle plane model data, and acquire coordinate points of the blood vessel contour in the corresponding multiple viewing angle plane model data according to the plane rectangular coordinate system, and mark them as a reference blood vessel contour coordinate point set; According to the target blood vessel contour coordinate point set, the number of the corresponding target view angle, the total number of target view angles, multiple target blood vessel contour coordinate points in each target view angle, the number of the target blood vessel contour coordinate points in each target view angle, and the total number of the target blood vessel contour coordinate points in each target view angle are obtained; According to the set of control blood vessel contour coordinate points, the number of the corresponding control viewing angle, the total number of control viewing angles, multiple control blood vessel contour coordinate points in each control viewing angle, the number of the control blood vessel contour coordinate points in each control viewing angle, and the total number of the control blood vessel contour coordinate points in each control viewing angle are obtained; The blood vessel similarity between each control three-dimensional blood vessel model and the target three-dimensional blood vessel model is calculated according to the number of the target view angle, the total number of the target view angle, the multiple target blood vessel contour coordinate points in each target view angle, the number of the target blood vessel contour coordinate points in each target view angle, the total number of the target blood vessel contour coordinate points in each target view angle, the number of the control view angle, the total number of the control view angle, the multiple control blood vessel contour coordinate points in each control view angle, the number of the control blood vessel contour coordinate points in each control view angle, and the total number of the control blood vessel contour coordinate points in each control view angle, wherein the calculation formula is: ； Where S represents the blood vessel similarity, i represents the number of the target view and the number of the control view, n represents the total number of the target view and the total number of the control view, g represents the number of multiple target blood vessel contour coordinate points in each target view, h represents the total number of multiple target blood vessel contour coordinate points in each target view, It is represented by the x-axis coordinate point of the g-th target blood vessel contour in each target viewing angle, It is represented by the x-axis coordinate point of the g+1th target blood vessel contour in each target viewing angle, It is represented by the y-axis coordinate point of the g-th target blood vessel contour in each target viewing angle, represents the g+1th target blood vessel contour y-axis coordinate point in each target view, u represents the number of multiple control blood vessel contour coordinate points in each control view, and p represents the total number of control blood vessel contour coordinate points in each control view. It is represented by the x-axis coordinate point of the u-th control blood vessel contour in each control viewing angle, It is represented by the x-axis coordinate point of the u+1th control blood vessel contour in each control viewing angle, It is represented by the y-axis coordinate point of the u-th control blood vessel contour in each control viewing angle, It is represented by the y-axis coordinate point of the u+1th control blood vessel contour in each control viewing angle.

2. The terminal for measuring the length of PICC catheter and locating the tip based on mixed reality technology according to claim 1, characterized in that: The step of obtaining a plurality of three-dimensional vascular models of PICC catheters in a database and marking them as reference three-dimensional vascular models includes: Collect patient arm length data; Construct arm length assessment intervals based on patients’ arm length data; A plurality of three-dimensional vascular models of PICC catheters corresponding to the arm length data within the arm length assessment interval are obtained from the database and marked as control three-dimensional vascular models.

3. The terminal for measuring the length of PICC catheter and locating the tip based on mixed reality technology according to claim 1, characterized in that: The step of obtaining a reference three-dimensional blood vessel model that meets preset conditions according to the blood vessel similarity and marking it as a similar three-dimensional blood vessel model includes: Obtaining a blood vessel similarity threshold; Determine whether the blood vessel similarity exceeds a blood vessel similarity threshold; If the vascular similarity exceeds the vascular similarity threshold, the control 3D vascular model is determined to be similar to the target 3D vascular model, and the vascular similarities that meet the similarity criteria are arranged in order from high to low, and the control 3D vascular model corresponding to the highest vascular similarity is selected and marked as a similar 3D vascular model; If the blood vessel similarity does not exceed the blood vessel similarity threshold, it is determined whether the reference three-dimensional blood vessel model is similar to the target three-dimensional blood vessel model.

4. The terminal for measuring the length of PICC catheter and locating the tip based on mixed reality technology according to claim 1, characterized in that: The step of obtaining a similarity compensation value according to the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model comprises: Obtaining standard blood vessel similarity; The similarity compensation value is calculated according to the standard blood vessel similarity and the blood vessel similarity between the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model, wherein the calculation formula is: ； In the formula, Expressed as a similarity compensation value, Expressed as a similarity compensation value, Expressed as standard vessel similarity.

5. The terminal for measuring the length of PICC catheter and locating the tip based on mixed reality technology according to claim 1, characterized in that: The step of obtaining the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model, and obtaining the puncture compensation value according to the puncture position in the target three-dimensional blood vessel model and the puncture position in the similar three-dimensional blood vessel model comprises: Acquiring a puncture position in a target three-dimensional blood vessel model and a puncture position in a similar three-dimensional blood vessel model; Recombining the target three-dimensional blood vessel model and the similar three-dimensional blood vessel model into a combined three-dimensional blood vessel model, wherein the combined three-dimensional blood vessel model includes a puncture position of the similar three-dimensional blood vessel model and a puncture position of the target three-dimensional blood vessel model; A linear coordinate system is established in the combined three-dimensional vascular model, wherein the origin of the linear coordinate system is the puncture position of the similar three-dimensional vascular model, and the negative direction of the linear coordinate system is the direction from the vein of the peripheral arm to the superior vena cava of the heart area; The puncture compensation value is obtained according to the coordinate point of the puncture position of the target three-dimensional blood vessel model in the linear coordinate system.

6. The terminal for measuring the length of PICC catheter and locating the tip based on mixed reality technology according to claim 1, characterized in that: The steps of obtaining the patient's arm circumference data, body fat percentage, and vascular elasticity value, obtaining the corresponding arm circumference data, body fat percentage, and vascular elasticity value according to the similar three-dimensional vascular model, and respectively obtaining the arm circumference compensation value, body fat compensation value, and vascular elasticity compensation value according to the patient's arm circumference data, body fat percentage, and vascular elasticity value and the arm circumference data, body fat percentage, and vascular elasticity value corresponding to the similar three-dimensional vascular model include: Obtain the patient's arm circumference data, body fat percentage, and vascular elasticity value, and mark them as target arm circumference data, target body fat percentage, and target vascular elasticity value, respectively; According to the similar three-dimensional vascular model, the corresponding arm circumference data, body fat percentage and vascular elasticity value are obtained, and are marked as similar arm circumference data, similar body fat percentage and similar vascular elasticity value respectively; According to the target arm circumference data, a plurality of corresponding target arm circumference values, a total number of target arm circumference values ​​and serial numbers of the target arm circumference values ​​are obtained; According to the similar arm circumference data, a corresponding plurality of similar arm circumference values, a total number of similar arm circumference values ​​and serial numbers of the similar arm circumference values ​​are obtained; The arm circumference compensation value is calculated according to multiple target arm circumference values ​​and multiple similar arm circumference values, wherein the calculation formula is: ； In the formula, is represented by the arm circumference compensation value, j is represented by the number of the ratio of the target arm circumference value to the similar arm circumference value, j is represented by the total number of the ratio of the target arm circumference value to the similar arm circumference value, Expressed as the target arm circumference value, Expressed as similar arm circumference values, It is expressed as the ratio of the jth target arm circumference value to the similar arm circumference value; The body fat compensation value is calculated based on the target body fat percentage and the similar body fat percentage, where the calculation formula is: ； In the formula, Expressed as body fat compensation value, Expressed as target body fat percentage, Expressed as similar body fat percentage; The vascular elasticity compensation value is calculated according to the target vascular elasticity value and the similar vascular elasticity value, wherein the calculation formula is: ； In the formula, Expressed as the vascular elasticity compensation value, Expressed as the target vascular elasticity value, Expressed as similar vascular elasticity values.

7. The terminal for measuring the length of PICC catheter and locating the tip based on mixed reality technology according to claim 1, characterized in that: The step of obtaining the length of the corresponding PICC catheter according to the similar three-dimensional vascular model, and obtaining the length of the patient's PICC catheter according to the arm circumference compensation value, the body fat compensation value, the vascular elasticity compensation value, the similarity compensation value, the puncture compensation value and the length of the PICC catheter corresponding to the similar three-dimensional vascular model includes: The length of the corresponding PICC catheter is obtained according to the similar three-dimensional blood vessel model and marked as the similar PICC catheter length; The patient's PICC catheter length is calculated based on the arm circumference compensation value, body fat compensation value, vascular elasticity compensation value, similarity compensation value, puncture compensation value and similar PICC catheter length, where the calculation formula is: ； In the formula, Expressed as similar PICC catheter length, Expressed as a similarity compensation value, Expressed as arm circumference compensation value, Expressed as body fat compensation value, Expressed as the vascular elasticity compensation value, Expressed as puncture compensation value.

8. The terminal for measuring the length of PICC catheter and locating the tip based on mixed reality technology according to claim 1, characterized in that: The step of obtaining the tip position of the PICC catheter according to the patient's PICC catheter length and the target three-dimensional blood vessel model includes: Obtain the length and tip position of the PICC catheter in a similar three-dimensional vascular model; A spatial coordinate system is constructed according to the position of the PICC catheter tip in the similar three-dimensional blood vessel model, wherein the origin of the spatial coordinate system is the position of the PICC catheter tip in the similar three-dimensional blood vessel model; The PICC tip difference is obtained based on the patient's PICC length and the PICC length and tip position in a similar three-dimensional vascular model; The coordinate point is obtained in the spatial coordinate system according to the difference of the PICC catheter tip, and the position of the PICC catheter tip of the target patient is obtained in the spatial coordinate system according to the coordinate point in the similar three-dimensional blood vessel model.

Images