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Method for constructing hybrid finite element deformation model for gastric cancer endoscopic surgery real-time navigation system

A deformation model, endoscopic surgery technology, applied in the fields of minimally invasive surgery, fluid mechanics, finite element analysis, imaging, can solve the problems of complexity, difficult to achieve real-time simulation response, etc., to reduce postoperative complications The effect of achieving precise treatment of gastric cancer and shortening the learning curve

Inactive Publication Date: 2018-02-16
NANFANG HOSPITAL OF SOUTHERN MEDICAL UNIV
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Problems solved by technology

The finite element model can simulate the biomechanical characteristics of human blood vessels very well, and this method has higher simulation accuracy than other simulation models, but the complexity of this method also makes it difficult to achieve virtual blood vessel following surgery in laparoscopic surgery. Requirements for real-time simulation response of device operation

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  • Method for constructing hybrid finite element deformation model for gastric cancer endoscopic surgery real-time navigation system
  • Method for constructing hybrid finite element deformation model for gastric cancer endoscopic surgery real-time navigation system

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Embodiment Construction

[0020] The construction process of the mixed finite element deformation model of the present invention is as follows figure 1 As shown, the details are as follows:

[0021] 1. Data collection:

[0022] Formulate criteria, such as about patients with (a) pathologically confirmed primary completely resectable gastric cancer patients (b) preoperative clinical stage: T1-4aN0-3M0 (c) abdominal enhanced CT less than 15 days before operation. The influence of other factors on this experiment was excluded.

[0023] 2. Construction of the original 3D model:

[0024] The preoperative CT image is segmented, marked, and modeled to obtain a virtual vascular tissue deformation model.

[0025] (1) CT scan:

[0026] The patient fasted for more than 6 hours, took 500ml warm boiled water orally to fill the intestinal tract half an hour before the scan, and took 500ml warm water to fill the stomach and duodenum 5 minutes before the scan. Conventional plain scan: 0.5×64 rows of detectors are...

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Abstract

The invention relates to a method for constructing a hybrid finite element deformation model for a gastric cancer endoscopic surgery real-time navigation system. The method comprises the following steps of: data acquisition: acquiring a CT image of a pre-operation abdomen enhancement stage film; construction of an original three-dimensional model; construction of the hybrid finite element deformation model: simulating a deformation process by adoption of a finite element model in an incremental form, and establishing a finite element equation; under a small deformation condition, carrying outanalysis by adoption of a finite element organization deformation simulation algorithm; under a large deformation condition; carrying out analysis by adoption of a semi-definite programming augmentation Lagrange viscoelastic model; and registering the hybrid finite element deformation model in an intra-operation laparoscopic image of a gastric cancer endoscopic surgery by utilizing optical tracking equipment, and providing blood vessel information that cannot be displayed by common laparoscopic surgeries in real time. The method is capable of effectively overcoming the matching difficulty of deformation tissues, improving the accuracy of navigation, accurately guiding the surgery process and improving the success rate of the surgeries, and is beneficial for the application and popularization of laparoscopic gastrointestinal surgeries.

Description

technical field [0001] The invention belongs to the fields of minimally invasive surgery, finite element analysis, fluid mechanics, imaging, etc., and relates to a method for constructing a hybrid finite element deformation model used in a real-time navigation system for gastric cancer laparoscopic surgery. Background technique [0002] Gastric cancer is one of the most common tumors in my country, and radical resection is the main treatment. Laparoscopic technique is more and more applied in the field of gastrointestinal surgery because of its less trauma and good postoperative recovery. However, laparoscopy has its own unique limitations such as tubular field of view, lack of tactile sensation and depth sense, and the course of perigastric blood vessels is complex, with many anatomical variations. The vascular injury caused by intraoperative lymph node dissection is one of the serious complications of laparoscopic gastric cancer surgery. It is also an important reason for...

Claims

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Application Information

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IPC IPC(8): G06F17/50A61B34/20G06T17/00
CPCA61B34/20A61B2034/2055G06F30/23G06T17/00
Inventor 李国新陈韬蒋振刚师为礼阮楚茵
Owner NANFANG HOSPITAL OF SOUTHERN MEDICAL UNIV
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