Scientists develop tiny, implantable device for treating overactive bladder

Researchers at Washington University, University of Illinois at Urbana-Champaign, and Northwestern University in the US, have developed a tiny, 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 has potential to help people with bladder problems bypass the need for medication or electronic stimulators.

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 incntinence and overactive bladder, but they also can disrupt normal nerve signalling to other organs. “There definitely is benefit to that sort of nerve stimulation,” said Robert W Gereau IV, a professor at Washington University. “But there also are some off-target side effects that result from a lack of specificity with those older devices,” said Gereau.

During a minor surgical procedure, they implant a soft, stretchy belt-like device around the bladder. As the bladder fills and empties, the belt expands and contracts. The researchers also inject 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 allows the researchers to use optogenetics — the use of light to control cell behaviour in living tissue — to activate those cells.

Using blue-tooth 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. This reduces the activity of the sensory neurons and restores normal bladder function,” Gereau said.

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. “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,” said John A Rogers, a professor at Northwestern University.

Closed-loop operation essentially means the device delivers the therapy only when it detects a problem. When the behaviour is normalised, the micro-LEDs are turned off, and therapy can be discontinued.

Researcher 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,” they said.