2 results about "Tissues types" patented technology

A surgical instrument, system and method for adjusting a compression force applied by a surgical instrument are disclosed. The method includes determining tissue impedance of tissue in contact with an end effector of the surgical instrument, determining a tissue type based on the tissue impedance, selecting a first energy modality to deliver to the surgical instrument, generating a first signal waveform based on the first energy modality, selecting a second energy modality to deliver to the surgical instrument, generating a second signal waveform based on the second energy modality, outputting the first and second signal waveform to deliver energy to the end effector, and adjusting a compression force applied by the end effector by changing a size of a gap between the tissue and the clamp arm based on a proportion of the first signal waveform to the second signal waveform.

The application relates to a simulation breast ultrasound scanning method and system based on force tactile feedback, the method comprising: acquiring a patient breast image, constructing a three-dimensional geometric model of a breast and internal structures thereof, and giving corresponding physical parameters to different tissue types; in the dynamic deformation process of the simulation breast soft tissue under external force, an implicit Euler time integral scheme is used to convert a dynamic problem into an energy minimization problem about node positions at the next time, wherein deformation energy of the breast tissue is divided into a stretching energy item and a volume change item, the stretching energy item is accurately solved through an optimization integrator, and the volume change item is approximately solved using a compliance constraint method and a Gauss-Seidel iteration method; and the solved deformation energy is converted into tactile information to simulate pressure changes and tissue rebounding feelings when a probe contacts with tissue in a real ultrasound examination. Compared with the prior art, the application can provide strong force and tactile feedback, enhances immersion and training effects.