Simulation method for soft tissue pressing and deformation recovery

Abstract

The invention discloses a simulation method for soft tissue pressing and deformation recovery. The method is used for simulating a pressing troubleshooting process of a liver in a virtual operation. The method comprises the following steps: constructing a surface model of a liver surface by using a mass point spring model with a bending spring, optimizing model parameters by using a particle swarm algorithm, then constructing a liver internal construct model by using internal mass point domain constraints based on stratification, and connecting stratification mass point domains by using constraint spring elements. According to the method, the deformation recovery capability and calculation efficiency of the mass point spring model during large deformation are improved, the deformation accuracy and authenticity of the mass point spring model are enhanced, the difficulty that a traditional mass point spring model cannot simulate the internal volume force is solved, and the viscoelastic characteristic of the soft tissue deformation process is simulated.

Description

technical field [0001] The invention relates to a soft tissue force-tactile simulation method, in particular to a simulation method for simulating soft tissue pressing and deformation recovery. Background technique [0002] In the process of performing surgery on human soft tissues, such as the liver, it is first necessary to sense the pressure of the liver to determine the lesion area. In the prior art, it is mentioned that the virtual surgery training system is used to provide surgeons with the conditions and platform for surgical training and learning. An important technical difficulty in realizing the virtual surgery system is the high-precision simulation of the virtual liver or other soft tissues. [0003] In the existing virtual soft tissue simulation method, the finite element model divides the problem solving domain into several non-overlapping units, and establishes the stiffness matrix through the unit shape function and node interpolation function to construct an...

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Problems solved by technology

[0004] Purpose of the invention: In view of the above problems, the present invention proposes a soft tissue simulation method for virtual surgery system, which simulates the deformation of soft tissue under the action of external force and after the external force is removed This method can not only meet the real-time requirements of simulation, but also improve the simulation accuracy of soft tissue deformation and deformation recovery ability, solve the simulation problem of soft tissue deformation recovery after removing the external force, and solve the problem of using surface model simulation. The inability to characterize soft tissue volumetric properties in the presence of deformation

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