Optimization Of Upper Superior Inferior Vena Cava Blockage Forceps In Liver Transplantation

Liver transplantation refers to a surgical treatment method that implants a healthy liver into a patient by surgery to improve the liver function of patients with end-stage liver disease.With the improvement of liver transplantation technology,liver transplantation has become the only effective treatment for end-stage liver disease.From the whole liver transplantation procedure and the author's interview with many surgical experts,it can be seen that during the removal of the diseased liver and the suture of the donor liver,only the forceps are used to block the blood supply.Once the slippage or blockage fails,the risk is extremely high,which seriously jeopardizes the life safety of the patient.Therefore,it is extremely important to study the clamping reliability of the surgical forceps here.Based on the above medical mechanism,we found that:1.The shape of the jaw tooth shape plays an important role in preventing the tissue from slipping during the clamping process.2.Optimizing the uniformity of the clamping force distribution of the surgical forceps on the tissue plays an important role in improving the stable and reliable clamping performance of the surgical forceps.However,there is no uniform standard for selecting surgical clamps to block the superior hepatic superior vena cava during the current surgical procedure.The reason is because there is still a lack of understanding and understanding of the mechanical and physical behaviors of the interface between the device and the biological soft tissue.During the daily operation,the doctor judges with the experience and experience of the supervisor.There is insufficient awareness of the performance of various devices in the corresponding use environment.It can be said that the existing research on surgical instruments and tissue interfaces,especially the basic theory,is still in the blank.Based on the above reasons,this paper compares the non-slip performance of the commonly used surgical jaws by the surgical clamp on the anti-skid performance simulation of tissue clamping.Several types of tooth shapes commonly used in the market were collected and made into samples.The polyurethane material was used as a simulated inferior vena cava elamp,and the simulated clamping object was laterally loaded by a custom fixture with a force sensing device,and passed through a small range.The tensile tester applies longitudinal force loading to the simulated clamp.Through this method,the friction performance of the surgical jaw jaw tooth shape at the interface between the tissue and the instrument was measured,and the slip performance of different tooth shapes under the same clamping condition was obtained.In the optimization of the uniformity of the clamping force distribution of the surgical forceps on the tissue,this paper uses the I-scan test device to evaluate the uniformity of the clamping force distribution of the most widely used KLINTMALM type surgical forceps,and uses ANSYS software to pass The finite element simulation simulation analyzes the stress and deformation trend of the product under the whole clamping state.It is found that the deformation of the jaw joint connecting beam is the largest during the whole clamping process,so that the relative distance of the whole jaw is two clamps.The distance between the mouths becomes smaller and then increases during the entire clamping process,resulting in uneven clamping force.Based on the above conclusions,by adjusting the stiffness at the connecting beam,the relative deformation of the connecting beam during the whole clamping process is reduced,and the possibility of increasing the distance between the two jaws is reduced,thereby reducing the clamping of the tissue by the surgical forceps.Force unevenness.The feasibility of optimization was verified by sample preparation and clamping force test.After the research and simulation test on the slippage performance and the uniformity of the gripping force distribution were completed,the optimized Sample was subjected to a fixed-point clamping experiment of the living animal.Under the operation of a clinician,three small pigs that had been anesthetized were subjected to inferior vena cava detachment,and the performance of the clamping and slipping performance was evaluated using an optimized surgical forceps.The results showed that the optimized surgical forceps had no risk of vascular slippage,and the clamping force was uniform,the elamping was stable,and the tooth marks were clear,which proved that the optimized surgical forceps for blocking the superior and inferior vena cava of the liver had superior bucking performance.,indicating its good performance and economic and social benefits.