One group of researchers from the Massachusetts Worcester Polytechnic Institute (WPI) written an article entitled "Green sea turtle design buoyancy compensation devices and prosthetic flippers," the paper tells them how to use the 3D printer to Help the Green Turtle to regain the dream of swimming. Green turtle is an endangered species. The biggest impact on green turtles is fishing. The large trawling industry, with lead strips on the bottom of the net, is in addition to the high-value fish species that humans love to eat. The shrimps and crabs on the seabed and the green turtles swimming in the sea are all spared. In the case of mixed fishing activities, a large amount of excessive waste of marine resources has been caused, and many living things have died. Loki, who lives in the Key West Aquarium in Florida, was hit by a ship, causing him to lose his right front fin and suffer spinal damage, which in turn caused the buoyancy on the right side of his back shell to be obstructed. Make it difficult for him to breathe normally, dive food, and swim straight. In order to continue his normal life, he needed a new buoyancy compensator and a prosthetic flipper, and WPI researchers decided to help it. The abstract of the paper is: "The purpose of this project is to develop a floating device to offset the buoyancy barrier of Loki and a prosthetic fin that mimics his healthy flipper. Using a 3D printer and molding process to create fins The limbs. Based on the calculations from previous projects, a flipper that works like a healthy fin has been developed. The attachment mechanism was designed by the project team and will be developed in collaboration with Hanger Prosthetics in Orlando, Florida. The team also created a A versatile process, presented in teaching brochures and videos, can be used to assist in making prosthetics for other turtles." In addition to creating buoyancy compensators and prosthetic fins, the team wanted to ensure that others could benefit from future work. Therefore, they also developed a versatile process to create prosthetic fins by taking photos and videos of their work, and then documenting the steps they took to create the flippers. The researchers learned about the kinematics behind the turtle's land and aquatic forms of motion in order to create the best prosthetic fins. The turtle's flippers are made up of dense connective tissue, which accounts for less than 6% of the animal's body weight, but they are necessary to help the turtles stay alive. “In the water sports of swimming turtles, four things are known to be true,†the team wrote. The first is that the swimming speed increases as the stroke rate increases. Second, the stroke amplitude and force produced by each stroke is proportional. Third, in the upper and lower stages of the stroke, the tortoise still produces forward thrust in the front. Finally, the maximum thrust of the stroke is reached at the end of the lower stroke cycle. Because the aquarium is unable to provide researchers with a CT scan of the Rocky stump, it makes it difficult to create debris that attaches the prosthesis to the turtle. Therefore, the team used the previous CAD design to make a smaller turtle to design an improved prototype fin, then split it into two parts for 3D printing, glue together, and use the mold to make the final restoration. . In this project, the team found that prosthetic fins could be built from data collected by any aquarium worker; the researchers wrote that the quality of the prosthesis is much lower than the quality of manufacturing using industrial grade equipment such as MRI machines and 3D printers. . The researchers worked with the aquarium to brainstorm the Rocky's buoyancy compensator. The final design was a modification of the team's third idea, connecting a weighted, adjustable strap to the shell of the turtle and weighting the right rear side of the shell. Made from FDA-approved neoprene material, the design is resistant to salt water and contains pockets, so it can disperse and exchange up to 3.5 pounds, depending on the gas position at the time. “The team faced some challenges when trying to find the right weight for the device and finding a way to stitch the fabric together to create a pocket,†the paper pointed out. These problems are solved by using weight in the aerobic exercise in the water and using a quick stitching sewing cone. Using these methods, you can easily copy the design if you need additional equipment. The device will be attached to the rocky shell using cement putty, which is currently used in aquariums and buoyancy devices. Putty is semi-permanent, so you can remove the device if needed. Now, Orlando's Hanger Prosthetics will test and assemble 3D printed prosthetic fins, and Rocky's buoyancy compensator has been mounted on the turtles, thanks to the students who worked hard to save the turtle swimming dreams.
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