Rhenium in Medical Implants: A New Growth Driver for the Precious Metal?

Imagine a future where medical implants are stronger, last longer, and promote better healing. This future may be closer than we think, thanks to the unique properties of rhenium. While primarily known for its use in high-temperature aerospace applications, rhenium is emerging as a game-changer in the medical implant industry. Could “Rhenium in Medical Implants” be the key to unlocking a new era of growth for this precious metal?

What is Rhenium?

Rhenium (Re) is a rare, silvery-white, heavy transition metal with the atomic number 75. Discovered in 1925, it’s one of the rarest elements on Earth, found in small quantities as a byproduct of copper and molybdenum mining. Rhenium boasts exceptional properties:

High Melting Point: One of the highest of all metals, around 3,180°C (5,756°F), making it useful in high-temperature applications.
Density: Very dense, providing strength and durability.
Corrosion Resistance: Resists corrosion and oxidation, maintaining performance in harsh environments.
Chemical Stability: Highly resistant to corrosion and oxidation, even at high temperatures.
High Tensile Strength: Demonstrates excellent resistance to wear.

These characteristics make rhenium invaluable in aerospace, electronics, and now, increasingly, in the medical field.

Rhenium’s Budding Role in Medicine

Rhenium’s application in medicine is not entirely new. Rhenium isotopes, such as rhenium-188 and rhenium-186, have been used in targeted radiotherapy for cancer treatment. These isotopes can be incorporated into radiopharmaceuticals that deliver localized radiation to tumors, enhancing treatment efficacy and minimizing damage to surrounding healthy tissues. Rhenium is also utilized in radiopharmaceuticals for diagnostic imaging, such as PET scans, creating detailed images of internal body structures for accurate diagnosis and monitoring of various medical conditions.

However, the most promising area for rhenium’s growth lies in its use as a structural component in medical implants.

Molybdenum-Rhenium (MoRe): A Superior Alloy

Rhenium is often alloyed with molybdenum to create a biomaterial known as MoRe. This alloy is garnering attention in the orthopedic market due to its:

Biocompatibility: Demonstrates excellent compatibility with living tissues.
MRI and CT Compatibility: Does not interfere with medical imaging.
Corrosion Resistance: Resists degradation within the body.
High Tensile Strength and Ductility: Allows for the design of low-profile implants.
Osteo-integration Properties: Facilitates bone growth around the implant.
Low Ion Release: Minimizes the risk of adverse reactions.

MoRe offers superior mechanical strength compared to traditional biomaterials like cobalt-chrome, titanium, and stainless steel. In fact, it can be two to three times stronger and four times more durable than cobalt-chrome or titanium, allowing for thinner, less invasive implants.

MiRus, a medical device manufacturer, has been at the forefront of developing and receiving FDA clearances for MoRe-based implants, including spinal implants, cardiovascular stents, and systems for treating structural heart disease.

Advantages of Rhenium-Based Implants

Compared to conventional materials, rhenium-containing implants offer several advantages:

Reduced Breakage: Traditional devices have a breakage rate of up to 10%, requiring replacement. Rhenium implants have shown zero breakage rates in initial testing.
Improved Fatigue Resistance: Rhenium alloys exhibit superior fatigue strength, crucial for implants subjected to cyclic loading.
Smaller Size and Lower Profile: The high strength of MoRe allows for smaller, thinner implants, leading to less soft tissue disruption and faster recovery.
Enhanced Imaging: MoRe stents absorb more radiation than traditional alloys, making them easier to implant precisely and safely. Also, MoRe reduces MRI artifact below that of pure titanium, a major clinical advantage.
Reduced Allergic Reactions: MoRe implants have not shown the allergic reactions associated with nickel, cobalt, or chromium implants.
Better Osseointegration: MoRe was found to have nearly twice the hydrophilicity compared to Titanium, one of the key factors in tissue response in regards to cell adhesion, migration, and replication.

Applications of Rhenium in Medical Implants

MoRe is finding its way into a variety of medical implant applications, including:

Orthopedic Reconstruction: Implants for repairing damaged bones and joints.
Spinal Fixation: Devices for stabilizing the spine after injury or surgery.
Cranial Reconstruction: Implants for repairing skull defects.
Upper and Lower Extremity Fixation: Implants for stabilizing fractures in arms and legs.
Cardiac Stents: Devices for opening blocked arteries.
Dental Implants: Posts for supporting artificial teeth.
Tissue Supporting Scaffolds: Frameworks for tissue regeneration.
Foot and Ankle Implants: Rhenium alloys show promise for the design of a new generation of smaller, stronger and more fatigue-resistant foot and ankle implants, which result in faster recovery and better outcomes for patients.

Challenges and Considerations

Despite its promise, the widespread adoption of rhenium in medical implants faces some hurdles:

Cost: Rhenium is a rare and expensive metal, which can increase the cost of implants.
Limited Supply: The limited availability of rhenium could constrain its use in high-demand applications.
Long Approval Process: It can take many years for new medical devices utilizing new biomaterials to gain regulatory approval.
Competition: Rhenium must compete with well-established materials like titanium, which have a proven clinical history and lower cost.

Market Trends and Future Outlook

The global rhenium market is projected to experience steady growth in the coming years. While aerospace remains a dominant consumer, the rising demand from biomedical applications is expected to create new opportunities.

Market Size and Growth: The Rhenium market is set to grow from USD 0.18 billion in 2025 to USD 0.19 billion in 2026, and is expected to achieve nearly USD 0.23 billion by 2034, advancing at a CAGR of 3.2% during 2025–2034.
Rising Demand: Several molybdenum-rhenium (MoRe) alloy medical devices have been approved by the US Food and Administration (FDA) and demand is growing fast.
China’s Influence: China has been hoovering up much of the global supply of rhenium for its burgeoning aerospace manufacturing industry, potentially creating supply competition.
Recycling: Growing demand for rhenium, driven by megatrends such as medicine, electronics and green hydrogen refining, in addition to Chinese aerospace manufacturing, could lift prices to levels that would spur increased recycling.

Titan International’s chief technical officer, Alex Iasnikov, believes that demand for rhenium in medical applications can grow very substantially, and wouldn’t be surprised if in 10 years it might disrupt markets.

Conclusion

Rhenium’s unique combination of strength, durability, biocompatibility, and imaging compatibility makes it an attractive material for medical implants. While challenges remain, the potential benefits of rhenium-based implants – reduced breakage, improved fatigue resistance, smaller size, and enhanced imaging – could revolutionize orthopedic, cardiovascular, and other surgical fields. As research and development continue, and as more rhenium-based devices receive regulatory approval, this precious metal is poised to become a significant growth driver in the medical implant industry.

Considering the potential of rhenium in medical implants? Contact us today for a consultation and explore how this innovative material can benefit your portfolio.