## 5 Conclusions  
Continuous ambulatory peritoneal dialysis treatment is of the utmost importance, as it completely replaces the kidney function in the human body. It was possible to design two connectors that exchange the dialysate liquid, satisfactorily carrying out the treatment procedure with the two commercial brands used in Mexico. Baxter(r) and PISA(r) devices are made of polyvinyl chloride (PVC) and polyetheretherketone (PEEK), while the developed connectors were manufactured using a titanium alloy (medical-grade) and ABS, achieving a satisfactory connection between the elements and establishing a successful connection without leaks. Currently, in Mexico, there is not a tool to enable the use of a combination of the two brands to perform the treatment of CAPD. The BP and PB connectors work as an element to mix the infusion and drainage bags of one brand with the transfer line of the other brand in order to accomplish this treatment. The assembly system in the developed connectors employs a particular thread, avoiding leaks of the fluid once the connection between the commercial devices with the BP and PB connectors is made. Additionally, a mechanical seal was added to ensure the connection was airtight in order to avoid pathological complications. Numerical tests allowed visual studios to analyze the fluid's behavior as it flowed through each connector. The BP connector flow profile patterns for the infusion process reached 3 mm/s at the inlet bag connection, with a controlled behavior of \(2.201\times 10^{-2}\) mm/s at the outlet transfer line flow of \(1.605\times 10^{-3}\) mm/s, which means a decrease in the velocity; in the draining process, maximum velocity profiles is \(1.420\times 10^{-3}\) mm/s at outlet drainage bag connection. The PB connector flow profile patterns in the infusion process are 6 mm/s at the outlet transfer line, which is the highest velocity in both cases; meanwhile, at the inlet bag, the connection decreased to \(1.650\times 10^{-6}\) mm/s  
It is important to mention at the internal duct; the neck flow profiles reach 74 mm/s; in the drain, the process flow reaches \(1.709\times 10^{-4}\) mm/s at the inlet of the transfer line; at the internal duct neck in this connector, the velocity reaches 42 mm/s, and continue to \(1.429\times 10^{-5}\) mm/s to the outlet drainage bag connection. Favorable results were obtained, which allowed developing technical plans for the manufacturing of the connectors. The connectors were manufactured in titanium \"Ti-6 Al-4V-ELI\"; the linking was established through the thread between devices, suiting it successfully. Experimental leak detection evaluations in each connector and results determine the fulfillment of the objectives and the necessity under which they were developed. Thus, melted deposition technology is useful for considerable cost reduction, allowing observational and connection studies, which helped to design a detailed connector. The 3D models obtained in ABS accomplishing the connection and exchange of the fluid between the brands satisfactorily. Additionally, each model (ornament and geometries) was accurately modeled, which is why it was considered a highly efficient method for developing the connectors. The immediate implementation of the BP and PB connectors will benefit a significant amount of Mexico's health sector, which helps around 8000 patients in institutions, as the Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado (ISSSTE) will perform the treatment with the transfer line that they are using. The experimental bench developed can be used to carry out tests with the drainage bags containing the liquid discarded by the human body; these tests would contribute to the research carried out so far. The exchange of fluids between the infusion and drainage bags of one brand with another brand's transfer line was successfully achieved, considering the medical sector's connection criteria. The flow connector patterns show a considerable change due to the diameter geometry and reductions in each connector.