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A 2004 report described an experimental way to put proteins into polymethyl methacrylate (PMMA), a material used in bone-replacement implants: expose protein-coated PMMA to supercritical carbon dioxide. The researchers proposed that an implant could then replace missing bone while acting as a local drug reservoir. The report did not establish that the approach was ready for surgery or that embedded drugs remained effective.
How the carbon-dioxide method worked
In the work reported by Stuart Nathan in Chemistry World on May 1, 2004, David Tomasko’s team at Ohio State University applied a protein solution to a coin-sized PMMA disc and exposed it to supercritical carbon dioxide in a glass tank.
The report says the protein penetrated 30 micrometres into the PMMA surface. The researchers described the carbon dioxide as lubricating the polymer chains, helping protein move into the material.
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The disc’s interior also developed small voids as it foamed. According to the report, the amount of foaming could be controlled by changing how quickly the carbon dioxide was released. Tomasko suggested the voids might provide additional spaces to hold drugs.
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Why researchers considered an implant that releases drugs
PMMA can serve as a bone-replacement material. The proposed extension was to make an implant deliver medicine near the surgical site as well as provide structural replacement. The report mentioned drugs intended to help prevent inflammation or infection after surgery, and local delivery of anticancer drugs after cancer-related bone removal. These were prospective applications, not demonstrated clinical benefits or established uses.
How sterilisation fits into the proposal
The Chemistry World report said supercritical carbon dioxide also sterilised the polymer surface. It contrasted that approach with heat, radiation and chemical sterilisation, which it said can alter the structure of drug active ingredients. This was part of the reported rationale for exploring the method; it does not establish that the resulting material met clinical sterilisation requirements.
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What remained unresolved in 2004
The report stated that more work was needed before the materials could be used in surgery. The team was still investigating whether drug molecules retained their effectiveness after embedding and was also looking at biodegradable materials that could release drugs after implantation.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThe article does not establish what happened to the work after 2004, whether the method progressed to clinical testing, or whether any such implant is available today. It should be understood as an early research concept, not an approved treatment, validated drug-delivery system or product recommendation.
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