Fixation Mechanism: Torque Range 0.2-4.5 Nm

Component Specifications

Definition

A fixation mechanism in medical implants is a specialized component designed to achieve stable attachment between an implant and biological tissue, typically bone. It functions through mechanical interlocking, biological integration, or a combination of both, ensuring proper positioning, load distribution, and long-term stability of orthopedic, dental, or cranial implants. These mechanisms prevent micromotion that could lead to implant loosening, fibrous tissue formation, or failure.

Working Principle

Fixation mechanisms work by creating a stable interface between implant and tissue through mechanical engagement (threads, press-fit, hooks), biological integration (osseointegration with porous surfaces), or adhesive bonding. They transfer physiological loads from the implant to surrounding structures while maintaining alignment. Common principles include friction fit, screw fixation with torque control, cement interdigitation, and surface coatings that promote bone ingrowth.

Materials

Titanium alloys (Ti-6Al-4V ELI), cobalt-chromium alloys (CoCrMo), stainless steel (316L), PEEK polymers, hydroxyapatite coatings, porous tantalum, bioresorbable polymers (PLA/PGA). Surface treatments include plasma spraying, grit blasting, and anodization.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Porosity	30-70% for porous structures
Thread Pitch	0.8-2.0 mm
Torque Range	0.2-4.5 Nm
Pull Out Strength	>500 N
Corrosion Resistance	ASTM F2129 compliant
Surface Roughness (Ra)	3-50 μm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 13485, ISO 14630, ISO 5832, ASTM F382, ASTM F543

Parent Products

This component is used in the following industrial products

Medical Implants

Medical devices surgically placed inside the body to replace, support, or enhance biological structures.

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Engineering Analysis

Risks & Mitigation

Aseptic loosening
Infection at implant site
Stress shielding
Corrosion fatigue
Allergic reactions to materials

FMEA Triads

Trigger: Insufficient torque during screw insertion
Failure: Implant loosening and migration
Mitigation: Use torque-limiting drivers and follow surgical protocols; design self-locking threads

Trigger: Poor bone quality or osteoporosis
Failure: Reduced pull-out strength and early failure
Mitigation: Design with larger surface area, use cement augmentation, or select bioactive coatings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm for critical dimensions, thread profile within ISO 5855-1 limits

Test Method

ASTM F543 for screw testing, ISO 7206 for implant fixation, fatigue testing per ISO 14801

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Fixation Mechanism

Manufacturer profiles associated with Fixation Mechanism.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What are the main types of fixation mechanisms in medical implants?

Primary types include threaded screws, press-fit stems, cementless porous coatings, bone plates with locking screws, and adhesive-based systems. Selection depends on implant location, bone quality, and load requirements.

How does osseointegration improve fixation?

Osseointegration involves bone growth into porous or roughened implant surfaces, creating a biological bond that enhances long-term stability and reduces micromotion compared to purely mechanical fixation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Fixation Mechanism