What it is
Implantable devices go inside the body. Pacemaker leads. Neurostimulator wires. Cochlear implant electrodes. Drug delivery ports. Cardiac monitoring loops.
High purity medical titanium wire for implantable devices is made for these applications. Not commercial wire. Not industrial. Medical grade. Extra clean. Extra pure. Extra traceable.
The wire stays in the body for years. Decades sometimes. It cannot corrode. Cannot release ions. Cannot break.
Why purity matters
Commercial titanium wire works for many things. But implantable devices are different.
| Requirement | Commercial wire | Medical implant wire |
| Oxygen control | ±0.10% | ±0.02% (ELI) |
| Iron control | Loose | Tight (≤0.25%) |
| Surface contamination | May exist | None |
| Traceability | Limited | Full heat to implant |
| Biocompatibility testing | No | Yes (per ISO 10993) |
High purity medical titanium wire for implantable devices meets the strictest standards. ASTM F67 for pure titanium. ASTM F136 for alloy. ELI chemistry. Low oxygen. Low iron.
Which grade for implantable devices
| Grade | Material | Purity | Best for |
| Grade 1 CP | Pure titanium | ≥99.5% | Pacemaker leads, neurostimulators |
| Grade 23 ELI | Ti-6Al-4V | ≥98.8% | Structural leads, high strength |
Grade 1 is the purest titanium available. 99.5% minimum. No aluminum. No vanadium. Used for devices where minimal metal ion release is critical.
Grade 23 ELI has higher strength. Used for devices that need both strength and biocompatibility. Still very pure. ELI means Extra Low Interstitial - lower oxygen and iron.
For high purity medical titanium wire for implantable devices, Grade 1 is often chosen for maximum purity. Grade 23 ELI when strength matters more.
Material specifications
Grade 1 CP (ASTM F67)
| Property | Value |
| Purity (min) | 99.5% |
| Tensile (min) | 240 MPa |
| Yield (min) | 170 MPa |
| Elongation | ≥ 24% |
| Density | 4.51 g/cm³ |
| Modulus | 105 GPa |
Grade 23 ELI (ASTM F136)
| Property | Value |
| Tensile (min) | 860 MPa |
| Yield (min) | 795 MPa |
| Elongation | ≥ 10% |
| Density | 4.43 g/cm³ |
| Modulus | 110 GPa |
Chemical composition - Grade 1 (ASTM F67)
| Element | Max limit |
| Oxygen | 0.18% |
| Iron | 0.20% |
| Carbon | 0.08% |
| Nitrogen | 0.03% |
| Hydrogen | 0.012% |
| Titanium | ≥99.5% |
No aluminum. No vanadium. No nickel. Just pure titanium.\
Chemical composition - Grade 23 ELI (ASTM F136)
| Element | Max limit |
| Oxygen | 0.13% |
| Iron | 0.25% |
| Carbon | 0.08% |
| Nitrogen | 0.05% |
| Hydrogen | 0.012% |
| Aluminum | 5.5 – 6.5% |
| Vanadium | 3.5 – 4.5% |
Common diameters for implantable devices
| Diameter (mm) | Device | Application |
| 0.1 – 0.2 | Pacemaker leads | Cardiac pacing |
| 0.2 – 0.3 | Neurostimulator leads | Spinal cord stimulation |
| 0.3 – 0.4 | Cochlear implant electrodes | Inner ear |
| 0.4 – 0.6 | Drug delivery port catheters | Subcutaneous ports |
| 0.6 – 0.8 | Cardiac monitoring loops | Loop recorders |
| 0.8 – 1.2 | Implantable pump components | Drug infusion |
| 1.2 – 2.0 | Structural leads | High strength applications |
| 2.0 – 3.0 | Device housings (wire form) | Custom shapes |
Where it goes
- Pacemaker leads. Wire carries electrical signal from pacemaker to heart. Sits in the bloodstream. Must not corrode. Must not clot. Surface must be ultra-smooth. 0.1mm to 0.2mm diameter. Grade 1. Electropolished.
- Neurostimulator leads. Spinal cord stimulator. Deep brain stimulation. Wire implanted near nerves. Flexes with body movement. Needs good fatigue life. Grade 1 or Grade 23 ELI depending on design.
- Cochlear implant electrodes. Array of wires in the cochlea. Stimulate auditory nerve. Very small. 0.3mm diameter. Grade 1. High purity. No toxic ions.
- Drug delivery port. Catheter from port to vein. Wire reinforced. Small diameter. Grade 1. Smooth surface prevents clotting.
- Cardiac monitoring loop. Loop recorder under skin. Wire loop senses heart rhythm. Grade 1. Biocompatible. Long term.
For high purity medical titanium wire for implantable devices, each application demands ultra-clean surface and tight chemistry control.
Why electropolished surface for implantable devices
Implantable devices touch blood. They touch tissue. Rough surfaces cause clots. Cause inflammation.
| Finish | Ra | Blood contact | Tissue response |
| Electropolished | ≤ 0.05μm | Excellent | Minimal |
| Polished | ≤ 0.1μm | Good | Low |
| Ground | ≤ 0.4μm | Poor | Moderate |
Electropolishing removes surface imperfections. Removes embedded particles. Creates a passive oxide layer. Smoother than mechanical polishing.
For high purity medical titanium wire for implantable devices, electropolished is the standard for blood-contacting devices.
Corrosion resistance in the body
Body fluids are corrosive. Saline. Proteins. Cells. pH varies.
Commercial grade titanium may have inclusions. Impurities. These become corrosion sites.
Medical grade high purity titanium has minimal inclusions. No surface contaminants.
| Test | Requirement |
| ASTM F2129 cyclic polarization | Pass |
| ISO 10993-5 cytotoxicity | Pass |
| ISO 10993-10 sensitization | Pass |
| ISO 10993-11 systemic toxicity | Pass |
Our wire passes all standard biocompatibility tests.
Fatigue life for long-term implants
Implantable devices flex. Heart beats. Body moves. Diaphragm contracts.
Pacemaker lead sees 70 million cycles per year. That's 70 million bends.
| Material | Fatigue limit | Suitability for high-cycle implants |
| Grade 1 CP | 200-250 MPa | Good |
| Grade 23 ELI | 500-600 MPa | Excellent |
| Stainless 316L | 300-400 MPa | Fair (nickel) |
For high-cycle applications like pacemaker leads, Grade 1 with smooth surface is proven. For higher stress, Grade 23 ELI.
Surface defects - zero tolerance
Implantable wire cannot have:
| Defect | Acceptance |
| Pits | None |
| Scratches >0.01mm depth | None |
| Embedded particles | None |
| Burrs | None |
| Oxide discoloration | None (must be silver) |
We inspect every lot. Surface analysis report available.
Coating options
Some implantable devices need coatings.
| Coating | Purpose | Application |
| PTFE | Insulation | Pacemaker leads |
| Silicone | Biostable insulation | Neurostimulator |
| Gold | Conductivity | Electrode tips |
| Iridium oxide | Stimulation efficiency | Cochlear implants |
We supply uncoated wire. Coating applied by device manufacturer. Our wire surface is prepared for coating adhesion.
Traceability - full chain
Implantable devices are Class III medical devices. Highest risk. Highest scrutiny.
Every high purity medical titanium wire for implantable devices comes with:
| Document | Provided |
| Heat number | Yes |
| Mill test report | Yes |
| ASTM F67 or F136 cert | Yes |
| Chemical analysis | Yes |
| Mechanical test results | Yes |
| Surface finish report | Yes |
| Biocompatibility test summary | Upon request |
EN 10204 3.1 standard. 3.2 with third-party witness.
We retain samples from every heat for 10+ years.
FAQ
Q: Grade 1 or Grade 23 ELI for pacemaker leads?
A: Grade 1. Pacemaker leads need maximum purity and flexibility. Grade 1 is softer. Better fatigue in bending. No aluminum or vanadium.
Q: What diameter for a pacemaker lead?
A: 0.1mm to 0.2mm. Very thin. Must fit through veins into the heart.
Q: Electropolished or polished for blood contact?
A: Electropolished. Ra ≤ 0.05μm. Smoother surface reduces thrombogenicity. Less clot formation.
Q: What about nickel in Grade 23 ELI?
A: Grade 23 ELI has no nickel. Both grades are nickel-free. Safe for nickel-sensitive patients.
Q: Can you supply wire in continuous coils for automated winding?
A: Yes. Coils up to 10km for fine wire. Spools available. Continuous length means no splices in your device.
Q: Lead time?
A:
| Order type | Lead time |
| Stock diameters (0.1mm – 1.0mm) | 10-14 days |
| Non-stock sizes | 4-6 weeks |
| Electropolished | Add 5-7 days |
Q: Sample wire for qualification?
A: Yes. 5 meter sample. Pay shipping. Material free for evaluation. Credit back on first production order over $20,000.
Q: Packaging for clean room?
A: Straight lengths in ultra-clean sealed tubes. Coils on clean spools in double anti-static bags. Labels show heat number, diameter, length, lot number, ASTM spec.
Q: Do you have ISO 13485 certification?
A: Yes. We are ISO 13485 certified for medical implant wire. Audited annually. Full quality system.
The bottom line
Implantable devices stay in the body for years. The wire must be pure. Clean. Strong. Safe.
High purity medical titanium wire for implantable devices delivers that.
| Feature | Benefit |
| Grade 1 CP | 99.5% pure, no Al/V |
| Grade 23 ELI | High strength, ELI chemistry |
| Electropolished surface | Ultra-smooth, blood compatible |
| No nickel | No allergic reactions |
| Full traceability | Regulatory ready |
| ISO 13485 | Medical device quality system |
For pacemaker leads. For neurostimulators. For cochlear implants. For drug delivery ports.
Pure enough for the heart. Strong enough for the body. Clean enough for long-term implant.
Contact
Need a quote on high purity medical titanium wire for implantable devices? Tell us grade (Grade 1 or Grade 23 ELI), diameter, length (straight or coil), quantity, and surface finish requirements. Include any biocompatibility documentation needs. We'll reply within 24 hours.
Email: kristy@mt-titanium.com
WhatsApp: +86-17391509251
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