Study On Reducing Insertion Resistence In Vascular Intervention Surgery

This topic comes from the national high technology research and development plan“863 Project”.The project name is the research and development of the robot in the Department of neurosurgery.In today’s society,with the continuous improvement of people’s living standards,cardiovascular and cerebrovascular diseases have gradually become a major disease that seriously threatens human health.In the treatment of cardio-cerebral vascular disease,vascular interventional surgery is increasingly accepted by patients and clinicians because it can reduce pain and recover faster than traditional treatment methods,but this requires the equipment with more precision and convenient,and less harmful to patients and doctors.In the process of surgery,blood is an important medium for the operation of the guidewire and is an important factor that affects the success or failure of the operation.As we all know,the blood is very viscous,so the viscosity of the blood inevitably obstructs the operation of the guidewire in vascular intervention surgery,which affects the accuracy of the clinician’s operation,increases the surgical difficulty,which may reduce the success rate of the surgery and effectiveness.Therefore,it must be realized that it is very meaningful to find a new method and design a new type of device to reduce the viscous resistance of blood in blood vessel intervention.In order to solve this problem,this paper proposes a new method to drive the catheter guide wire microvibration to reduce the viscous resistance of the blood to the guide wire of the catheter during surgery.After studying the vibration characteristics of piezoelectric plate and piezoelectric ceramics,we designed a novel devices to conduct the experiment.At first,this paper described the background of the topic,introduced the advantages of vascular interventional surgery compared to traditional open surgery,and the research status of master-slave interventional robotic systems,and elaborated the importance of reserarching the method on reducing the viscous resistence of guidewires in interventional surgery robotic systems,and the shortcomings of current interventional robotic systems in this area,illustrate the purpose and significance of this topic.Then,in order to solve this problem,this paper proposes a method of adding micro-vibration to the guide wire.From the mechanism analysis,it is possible to influence the characteristics of the blood by adding micro-vibration,so as to reduce the viscous resistence of guidewire insertion process in the interventional robotic system.Secondly,we study the vibration characteristics of different vibration sources,including input signal,clamping position and other factors,select the appropriate vibration source(the piezoelectric plate and the piezoelectric ceramics)for the system,and design the clamping device of the vibration source according to this result to ensure that microvibrations can be added during the insertion of the catheter guidewire.Then,a force measuring system was designed to simulate the insertion of guidewire in the vascular interventional surgery.Through design experiments,it was verified whether supplemental microvibration can effectively reduce the viscous force encountered during catheter guidewire insertion.Then a lot of experiments were carried out by changing experimental conditions to explore the influence of input signal frequency,liquid medium viscosity,tube diameter and other factors on the viscous forces encountered during guidewire insertion,and related formulas were deduced using statistical methods.Finally,this paper summarizes and prospects the method,evaluates the advantages and disadvantages of the method,and prospects the application prospect of this method in the vascular interventional surgery robot system in the future.