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Summary: Researchers have developed a new implantable device that can “cool” nerves and provide on-demand pain relief for those suffering from neuropathic or chronic pain.

An implantable device designed to “cool” nerves can provide targeted, on-demand pain relief, researchers report. When tested on rats with neuropathic pain, the device produced highly localized cooling.

“An implantable cooling device with on-demand local analgesia will be a game changer for long-term pain management,” write Shan Jiang and Guosong Hong in a related Perspective. It offers a promising path toward creating a class of analgesic devices for long-term, nonopioid pain management.

Pain management is a pressing health issue for many, who often must turn to effective yet highly addictive and sometimes deadly opioid pain medications. This has made the development of localized, nonopioid, and nonaddictive alternatives highly attractive.

One such approach is analgesic nerve cooling, which holds promise as an effective and reversible way to alleviate pain, including after amputations, nerve grafts, or spinal decompression surgeries, as examples. Like putting ice on a sore joint or muscle, targeted application of cold temperature directly to nerves can block the conduction of pain signals, providing temporary relief.

However, conventional nerve cooling devices are bulky and rigid with non-specific cooling and high power requirements – qualities that prevent practical clinical use.

To address this, Jonathan Reeder and colleagues developed a soft, miniaturized, and implantable nerve cooling system based on state-of-the-art microfluidic and flexible electronic technologies.

Borrowing from electrical nerve cuffs, Reeder et al. use a liquid-to-gas phase transition within microfluidic channels in an elastic band that wraps around peripheral nerves to provide targeted cooling. An integrated thermal thin film sensor in the device provides real-time temperature monitoring and control.

Since the device is made from water-soluble and biocompatible materials, it is bioresorbable (meaning it degrades), reducing necessary surgery risk.

To demonstrate the device’s ability, the authors performed in vivo experiments in rat models of neuropathic pain, rapidly and precisely cooling peripheral nerves to provide local and on-demand pain relief.

“Besides the demonstrated strengths of the miniaturized flexible cooling device for pain mitigation,” write Jiang and Hong in the related Perspective, “the technology presents further opportunities for neuroscience research and neurological practice.”

Author: Press Office Source: AAAS Contact: Press Office – AAAS Image: The image is in the public domain

Original Research: Closed access. “Soft, bioresorbable coolers for reversible conduction block of peripheral nerves” by Jonathan T. Reeder et al. Science

Soft, bioresorbable coolers for reversible conduction block of peripheral nerves

Implantable devices capable of targeted and reversible blocking of peripheral nerve activity may provide alternatives to opioids for treating pain. Local cooling represents an attractive means for on-demand elimination of pain signals, but traditional technologies are limited by rigid, bulky form factors; imprecise cooling; and requirements for extraction surgeries.

Here, we introduce soft, bioresorbable, microfluidic devices that enable delivery of focused, minimally invasive cooling power at arbitrary depths in living tissues with real-time temperature feedback control. Construction with water-soluble, biocompatible materials leads to dissolution and bioresorption as a mechanism to eliminate unnecessary device load and risk to the patient without additional surgeries.

Multiweek in vivo trials demonstrate the ability to rapidly and precisely cool peripheral nerves to provide local, on-demand analgesia in rat models for neuropathic pain.

Is this available ow? If so where? What is the success of this?

I would love to try it for this pain I’m constantly in after having a laminectomy 6 years ago.

For a forum such as this, I expect language to say what it means. Repeatedly referring to micro-dosing – something that has potential negative health impacts! – as “cooling” sounds cavalier and like something straight out of the marketing department of a device manufacturer or patent developer. Oh, but it is serious, I understand, with all the money or reputation on the line, so I guess that justifies the use of cute words to obfuscate what might happen to patients. Regardless of the technology, it is disappointing (to put it politely) to encounter marketing miscommunication (sorry, “reaching out to the masses”) in a paper purporting to describe scientific investigation and technological development in medical care.

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