Long-term mitigation of the foreign-body response with dexamethasone-eluting cochlear implants in mice

The inflammatory foreign body response that follows cochlear implantation produces intracochlear fibrosis, neo-ossification, and elevated electrode impedances that can compromise implant performance. Dexamethasone-eluting cochlear implants reduce this response, but the durability of their anti-inflammatory effect over long implantation intervals has not been established....

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No immediate clinical change warranted — this is promising mouse-model preprint data; human translation requires further in vivo studies and safety trials before influencing cochlear implant surgical or device selection practice.

If drug-eluting cochlear implants can durably suppress the foreign-body inflammatory response in humans, it could preserve residual hearing and improve long-term electrode performance — a significant advance for the CI field.

1. 01Dexamethasone-eluting cochlear implants reduced intracochlear fibrosis and neo-ossification in a mouse model.
2. 02Elevated electrode impedances — a sign of inflammation and poor device contact — were also mitigated long-term.
3. 03Study used a mouse model; human applicability is not yet established.
4. 04Findings are published as a preprint and have not yet undergone full peer review.
5. 05Drug-eluting CI technology is an active research area with several ongoing development programs.

PMID

42922679

DOI

10.64898/2026.08.26.747195.

Publication type

research_article

Evidence level

4

Population

Mouse model of cochlear implantation

Intervention

Dexamethasone-eluting cochlear implants

Comparator

Standard cochlear implants (no drug elution)