Tiny, implantable device uses light to treat bladder problems
Device has potential to replace electronic stimulators, drugs for pain and incontinence
A team of neuroscientists and engineers has developed a tiny, implantable device that has potential to help people with bladder problems bypass the need for medication or electronic stimulators.
The team — from Northwestern University, Washington University in St. Louis and the University of Illinois in Urbana-Champaign — developed a soft, implantable device that can detect overactivity in the bladder and then use light from tiny, biointegrated LEDs to tamp down the urge to urinate
The device works in laboratory rats and one day may help people who suffer incontinence or frequently feel the need to urinate.
The new strategy is outlined in a paper published today (Jan. 2) in the journal Nature. Northwestern’s John A. Rogers and Washington University’s Robert W. Gereau IV led the research.
Overactive bladder, pain, burning and a frequent need to urinate are common and distressing problems. For about 30 years, many with severe bladder problems have been treated with stimulators that send an electric current to the nerve that controls the bladder. Such implants improve incontinence and overactive bladder, but they also can disrupt normal nerve signaling to other organs.
“There definitely is benefit to that sort of nerve stimulation,” said Gereau, the Dr. Seymour and Rose T. Brown Professor of Anesthesiology at Washington University School of Medicine. “But there also are some off-target side effects that result from a lack of specificity with those older devices.”
Rogers, Gereau and their colleagues developed the new device in hopes of preventing such side effects.
During a minor surgical procedure, the team implanted a soft, stretchy belt-like device around the bladder. As the bladder fills and empties, the belt expands and contracts. The researchers also injected proteins called opsins into the animals’ bladders. The opsins are carried by a virus that binds to nerve cells in the bladder, making those cells sensitive to light signals. This allowed the researchers to use optogenetics — the use of light to control cell behavior in living tissue — to activate those cells.
Using bluetooth communication to signal an external hand-held device, the scientists can read information in real time and, using a simple algorithm, detect when the bladder is full, when the animal has emptied its bladder and when bladder emptying is occurring too frequently.
“When the bladder is emptying too often, the external device sends a signal that activates micro-LEDs on the bladder band device, and the lights then shine on sensory neurons in the bladder,” Gereau said. “This reduces the activity of the sensory neurons and restores normal bladder function.”
The researchers believe a similar strategy could work in people. Devices for people likely would be larger than the ones used in rats, and could be implanted without surgery, using catheters to place them through the urethra into the bladder.
“We’re excited about these results,” said Rogers, the Louis Simpson and Kimberly Querrey Professor of Materials Science and Engineering, Biomedical Engineering and Neurological Surgery at Northwestern. “This example brings together the key elements of an autonomous, implantable system that can operate in synchrony with the body to improve health: a precision biophysical sensor of organ activity; a noninvasive means to modulate that activity; a soft, battery-free module for wireless communication and control; and data analytics algorithms for closed-loop operation.”
Rogers has appointments in Northwestern’s McCormick School of Engineering and Feinberg School of Medicine, directs the Center for Bio-integrated Electronics and is a member of the Simpson Querrey Institute.
Closed-loop operation essentially means the device delivers the therapy only when it detects a problem. When the behavior is normalized, the micro-LEDs are turned off, and therapy can be discontinued.
Gereau and Rogers expect to test similar devices in larger animals. The researchers also believe the strategy could be used in other parts of the body — treating chronic pain, for example, or using light to stimulate cells in the pancreas to secrete insulin. One hurdle, however, involves the viruses used to get light-sensitive proteins to bind to cells in organs.
“We don’t yet know whether we can achieve stable expression of the opsins using the viral approach and, more importantly, whether this will be safe over the long term,” Gereau said. “That issue needs to be tested in preclinical models and early clinical trials to make sure the strategy is completely safe.”
This article was written by Jim Dryden of Washington University School of Medicine in St. Louis.