Researchers at the Shiga Medical Center for Adults in Japan have developed biodegradable plastic stents for implantation in humans suffering from coronary artery stenosis, or constriction. The development was led by Hideo Tamai, who was searching for an alternative to the metallic stents currently used. While metallic stents have been used effectively for nearly 15 years, they can occasionally damage blood vessels. When used in children, they can come loose as the repaired vessel increases in size as the child grows. The stent developed by Tamai and his colleagues is made of a poly-l-lactic acid (PLLA) monopolymer that is 0.17-mm thick formed into a zigzag helical coil. The 12-mm long PLLA stent comes in three diameter sizes: 3, 3.5, and 4 mm. Lactic acid polymer is already used in other medical applications, such as binding broken bones and surgical sutures. Tamai says that stents are typically needed for only 6 months after implantation because the blood vessel strengthens naturally. The new stent is absorbed by the body in 18 to 24 months. In studies conducted at the center, patients with the plastic stents had a lower rate of restenosis than patients with metallic stents. "We expect that the PLLA stents will become another alternative for heart patients," says Keiji Igaki of Igaki Medical Planning Co., Ltd., which manufactures the PLLA stents. For more information, call Hideo Tamai at +81 77 582 5031, or fax at +81 77 582 5426; or contact Keiji Igaki at +81 75 594 5595.
What makes this movie stand out from the typical high school sports story is that the teenagers are undocumented immigrants, and the big game is a NASA-sponsored marine robotics competition. Like many other Hollywood movies, however, Spare Parts only tells part of the story. What the film shows -- and doesn’t show -- raises important issues affecting STEM education in the US.
Instead of sifting through huge amounts of technical data looking for answers to assembly problems, engineers can now benefit from 3M's new initiative -- 3M Assembly Solutions. The company has organized its wealth of adhesive and tape solutions into six typical application areas, making it easier to find the best products to solve their real-world assembly and bonding problems.
Load dump occurs when a discharged battery is disconnected while the alternator is generating current and other loads remain on the alternator circuit. If left alone, the electrical spikes and transients will be transmitted along the power line, leading to malfunctions in individual electronics/sensors or permanent damage to the vehicle’s electronic system. Bottom line: An uncontrolled load dump threatens the overall safety and reliability of the vehicle.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.