A Research Of Modeling An Elastic Vascular And Guidewire For Minimally Invasive Vascular Surgery

Minimally invasive vascular interventional surgery(MIVS)is one of the most effective ways to treat cardiovascular disease.Compared with traditional open surgery,it has the advantages of less trauma,quicker recovery,and less pain.During the interventional procedure,the doctor threads the guidewire and stent to the lesion site using digital silhouette angiography(DSA).Practicers need to learn through a large number of clinical observations and surgical exercises based on live animals.Expensive surgical costs and radiation from long-term exposure to the operating room under X-ray,have limited the location and frequency of training.In order to solve the drawbacks of the traditional surgical training methods,and with the development of virtual reality technology,surgical simulators based on virtual reality technology have emerged.In order to provide an efficient and realistic training platform for vascular interventional surgeons,this article has developed a research on virtual vascular interventional surgery training system.First of all,according to the drawbacks of traditional surgical training methods,a surgical simulator based on virtual reality technology was designed.Based on the Open GL rendering engine,a surgical scene consisting of flexible blood vessels and a flexible surgical guide wire was constructed.The X-ray fusion technology was enhanced.The fidelity of the virtual surgery scene improves doctor's immersion.Secondly,flexible blood vessel model is proposed in this paper to solve the problem that rigid blood vessels can't satisfy reality and fidelity in the current virtual training system.This paper builds a flexible blood vessel model based on the improved mass-spring model,and brings about the body spring.For the problem of low fidelity,stretching constraint and bending constraint were proposed to correct the position of the particles.Then,we modeled the important surgical instruments in surgery.Based on the theory of Cosserat elastic rods,we proposed a virtual surgical guidewire model.We proposed a length constraint to improve the stability of the guidewire.Finally,the real-time,stable collision detection and collision response module is an important environment for the interventional surgery training system.This paper uses the collision detection algorithm of the AABBs bounding box and finally completes the collision response of the guide wire and blood vessel based on Bullet.At the end of the article,the research content and research results of the subject were summarized,and the work that the subject still needs to be further developed is anticipated.