# A skull ultrasound implant that opens the barrier at every cycle

Source: https://onco.cc/ideas/idea-bio2-implanted-ultrasound-repeat-dosing/  
OnCo record `idea-bio2-implanted-ultrasound-repeat-dosing` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

A small ultrasound device implanted in the skull can be switched on at each chemotherapy visit to briefly open the brain barrier, letting drugs in every cycle.

## Summary

Implantable ultrasound emitters have been used in recurrent glioblastoma trials with carboplatin and with albumin-bound paclitaxel, showing repeated safe barrier opening and increased brain drug concentrations. The remaining questions are whether the added exposure translates into survival, and which drug benefits most from repeated opening.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: Repeated implant-mediated barrier opening at least doubles parenchymal drug concentration and improves progression-free survival in recurrent glioblastoma compared with the same drug without sonication.
- Rationale: Concentration is the most plausible reason systemic agents fail in glioma, and repeated opening turns a one-off intervention into a dosing strategy that matches chemotherapy cycles. Human safety across multiple sonications is already reported.
- Proposed test: A randomised trial of drug plus sonication versus drug alone in recurrent glioblastoma, with a pharmacokinetic substudy in patients undergoing subsequent resection.
- Maturity: early-clinical
- Actor: industry

## Sources

- Bottleneck evidence (The brain: barrier and sanctuary): Stupp et al., Radiotherapy plus concomitant and adjuvant temozolomide for glioblastoma (NEJM 2005): https://doi.org/10.1056/NEJMoa043330

## Connected records

- ideas: [Focused-ultrasound BBB opening to deliver ADCs and radioligands to glioma](https://onco.cc/ideas/idea-fus-plus-adc-glioma/)
- cancers: [Glioma & glioblastoma](https://onco.cc/cancers/glioblastoma/)
- technologies: [Cytotoxic chemotherapy](https://onco.cc/technologies/cytotoxic-chemotherapy/), [Focused-ultrasound blood-brain barrier opening](https://onco.cc/technologies/bbb-focused-ultrasound/)
- drugs: [Carboplatin](https://onco.cc/drugs/carboplatin/), [Paclitaxel / nab-paclitaxel](https://onco.cc/drugs/paclitaxel/), [Temozolomide](https://onco.cc/drugs/temozolomide/)
- terms: [Blood-brain barrier (BBB)](https://onco.cc/terms/blood-brain-barrier/)
- trials: [Sonocloud-9 in Association With Carboplatin Versus Standard-of-Care Chemotherapies (CCNU or TMZ) in Recurrent GBM](https://onco.cc/trials/nct05902169/)
- bottlenecks: [The brain: barrier and sanctuary](https://onco.cc/bottlenecks/b-brain-delivery/)
- key papers: [A European randomised controlled trial of the addition of etoposide to standard vincristine and carboplatin induction as part of an 18-month treatment programme for childhood (≤16 years) low grade glioma - A final report](https://onco.cc/key-papers/paper-carboplatin-glioblastoma-eur-j-cancer-2017/), [A randomized, double-blind, placebo-controlled, phase 2 study of RMP-7 in combination with carboplatin administered intravenously for the treatment of recurrent malignant glioma](https://onco.cc/key-papers/paper-carboplatin-glioblastoma-neuro-oncol-2003/), [Randomized phase 2 study of carboplatin and bevacizumab in recurrent glioblastoma](https://onco.cc/key-papers/paper-carboplatin-glioblastoma-neuro-oncol-2015/)

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