A breakthrough in medical science could soon change the lives of millions of people who rely on life-saving implantable devices like pacemakers, while also paving the way for tiny, self-charging implants that could revolutionize how technology can transform the human body.
Researchers at Dartmouth College are developing a new biomedical device the size of a dime that will be capable of transforming the heart’s kinetic energy into electricity through thin-film energy conversion materials.
The tiny new device will be capable of maintaining a constant charge for cardiac pacemakers, defibrillators, and other devices that traditionally rely on battery power, and require surgery every five to 10 years to replace depleted batteries.
Lead researcher and Dartmouth engineering professor John Zhang told Advanced Materials Technologies:
“We’re trying to solve the ultimate problem for any implantable biomedical device … How do you create an effective energy source so the device will do its job during the entire life span of the patient, without the need for surgery to replace the battery?”
Such surgeries are typically costly and also carry the risk of complications or deadly infections.
The device would modify existing pacemakers by attaching a lead wire to a beating heart and converting the kinetic energy of the heartbeat into a consistent electrical charge.
The breakthrough material involved is a specialty polymer piezoelectric film called PVDF that, when designed with porous structures such as an array of tiny beams or a flexible cantilever, is capable of transforming small mechanical motions such as a heartbeat into electrical energy.
Research associate Lin Dong added:
“Of equal importance is that the device not interfere with the body’s function … We knew it had to be biocompatible, lightweight, flexible, and low profile, which also makes it not only fit into the current pacemaker structure but also scalable for future multi-functionality.”
In the future, devices based on this technology may include sensors and other implantable biomedical devices that would enable the real-time collection of data for monitoring patients.
Researchers estimate that the self-charging pacemaker could reach patients in about five years, following the completion of pre-clinical trials and approval by regulators.
“We have completed the first round of animal studies with great results which will be published soon,” said Zhang.
Derek Chauvin Found GUILTY of Murdering George Floyd
Former Minneapolis police officer Derek Chauvin has been found guilty on all counts in the murder of George Floyd, the 46-year-old Black man whose death at Chauvin’s hands last May sparked a long period of unrest and major protests against policing and racism in America.
After deliberating for about 10 hours over two days, the jury found Chauvin guilty of second-degree murder, third-degree murder and manslaughter for the killing of Floyd on a street corner last year on Memorial Day.
The second-degree murder charge carries a maximum sentence of 40 years. The third-degree murder charge carries a maximum sentence of 25 years, and second-degree manslaughter can carry up to 10 years.
In harrowing video footage from the May 25, 2020, incident that has been seen billions of times across the globe, Chauvin could be seen kneeling on the neck of Floyd for over nine minutes while fellow Minneapolis officers Tou Thao, J Alexander Kueng, and Thomas Lane stood by. Meanwhile, a horrified crowd of bystanders filmed and pled with officers as the event transpired.
On Monday, the prosecution and defense presented their closing arguments to the jury.
Prosecutors argued that Chauvin’s actions directly led to Floyd dying from low oxygen, or asphyxia. Prosecutor Steve Schleicher said that Chauvin “chose pride over policing,” calling his actions “unnecessary, gratuitous and disproportionate.” He also reminded the jury that Chauvin’s hundreds of hours of training over the course of 19 years with the Minneapolis Police Department should have led to a different outcome than Floyd’s death during a crisis.
The prosecution also focused on the fact that Chauvin knee was on Floyd’s neck for nine minutes and 29 seconds.
The defense, however, argued that Floyd’s use of illegal drugs and a pre-existing heart condition were to blame and that “the totality of the circumstances,” including exposure to carbon monoxide, led to his death in police custody.
38 witnesses were called by prosecutors, including the teenager who recorded the widely seen video that has been played endlessly over the past year. She and other bystanders testified that they remain haunted by Floyd’s death. The defense called seven witnesses, including two experts.
Floyd’s death rekindled a long-seething anger over police brutality and racial oppression in the United States, with cities across the U.S. and the world rising up in protest over his killing and the killings of other victims of law enforcement.
President Joe Biden had expressed his wish for “the right verdict” without specifying explicitly whether the verdict would be guilty or not guilty. Biden had been careful not to comment on a potential outcome in Chauvin’s trial while urging calm.
Residents, activists and journalists descended on the Hennepin County Courthouse in downtown Minneapolis when the announcement was made at 2:30 pm local time that the verdict has been reached. The crowd greeted the judge’s announcement of Chauvin’s guilty charges with applause and cheers.
Cliffhanger: Mountain Biker Saved From “Imminent Death” After Falling Into Canyon
A Southern California mountain biker is likely counting his blessings after he was rescued from what authorities describe as “imminent death”” after falling from the side of a cliff in the Angeles National Forest.
The mountain biker, described as an older man, fell into the canyon at Mt. Wilson on Thursday morning and was dangling hundreds of feet above the ground before his fellow bikers, and eventually a special team from the Los Angeles County Sheriff’s Department, rescued him.
For some time the man dangled by a thin cord around his ankle that was tied to his bicycle while hanging on for dear life “like a cat,” Capt. Tom Giandomenico of the LASD special enforcement bureau told the Los Angeles Times.
“He knew he was in such a precarious situation. He was just scared to even rotate his head to look at us. He just didn’t want to move a muscle,” LASD Deputy Richard Thomsen told CBSLA.
Additionally, when the helicopter team arrived it wasn’t just a matter of simply hoisting the man to safety, as the air generated by the helicopter’s rotor would have sent the man plummeting to “imminent death,” Giandomenico added.
“Because he was head-down on the rock face there, that dropped probably a good 40 feet before it hit some soft dirt and a boulder,” Sheriff’s Deputy Scott Helbring said. “And beyond that was hundreds of feet down to the bottom of the canyon.”
Instead, one of the members of the special enforcement team composed of former SWAT officers devised a plan to rappel down to the man and move him to a ledge below, from which the two could be airlifted to safety.
However, due to a lack of boulders or trees, there was nothing to tie a rope to – and thus no way to rappel down to anything.
So instead, the special enforcement team used the man’s brother and another friend to be their anchor, a plan that ultimately succeeded.
Giandomenico called the rescue “one of the more significant, courageous maneuvers I’ve seen.”
“Heroic, in my opinion,” he added.
Scientists Create First-Ever Embryos With Monkey and Human Cells
For the first time, scientists have created embryos in a lab that contain the cells of both humans and monkeys.
Scientists hope that by creating chimeric embryos – embryos containing cells from two distinct species – they might be able to create organs for people who desperately need transplants.
Over 100,000 people in the United States lone are currently on a waiting list for organ transplants crucial to saving their lives, but the supply of donor organs has dropped significantly since the pandemic began unfolding.
Researchers have attempted to inject human stem cells into the embryos of pigs and sheep in recent years in hopes of growing organs for transplants, but this hasn’t yielded positive results. Scientists are hoping that by turning to macaque monkeys, which share a greater genetic similarity to humans, they may have more success.
In a study published Thursday in the journal Cell, researchers in the U.S. and China injected 25 pluripotent stem cells from humans into embryos from macaque monkeys.
After one day, the researchers detected human cells beginning to grow in 132 of the embryos. They embryos ultimately survived for 19 days.
However, bioethicists have raised concerns about the potential for abusing medical regulations that currently govern the treatment of animal and human subjects, as well as the possibility that a rogue scientists might potentially spike living creatures with human cells.
“My first question is: Why?” Kirstin Matthews, a science and technology fellow at Rice University’s Baker Institute, told NPR. “I think the public is going to be concerned, and I am as well, that we’re just kind of pushing forward with science without having a proper conversation about what we should or should not do.”
Researchers insist that the study serves purely humanitarian goals that could save countless lives in the future.
“This work is an important step that provides very compelling evidence that someday when we understand fully what the process is we could make them develop into a heart or a kidney or lungs,” said University of Michigan professor Jeffrey Platt, who was not involved in the study.
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