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Spinal Pedicle Screw-Rod System Torsional Fatigue Testing Machine

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Whats/App: +86 181 0160 0864

Web: gellowen.co.uk

The Spinal Pedicle Screw-Rod System Torsional Fatigue Testing Machine is a specialized device used to evaluate the torsional fatigue performance of spinal implant systems, specifically pedicle screws and connecting rods.

Standards

YY/T 0857. YY/T 1560. ASTM F1717. ASTM F2706

These standards define the materials and methods for static and fatigue testing of spinal implants in vertebral resection models, including cervical and cervicothoracic implant assemblies. Fatigue tests are performed at a frequency of 5 Hz, R = -1. for 5 million cycles or until specimen failure.

Application

The Spinal Pedicle Screw-Rod System Torsional Fatigue Testing Machine is used to evaluate the mechanical durability and torsional fatigue performance of spinal fixation systems under repeated rotational loads. Typical applications include:

Orthopedic implant testing: Assess torsional strength and fatigue life of pedicle screw-rod constructs.

Quality control: Verify consistency and mechanical reliability of manufactured spinal fixation systems.

Research and development: Support design optimization and material selection for spinal implants.

Standards compliance: Conduct tests according to ISO 12189. ASTM F1717. and other international spinal implant testing guidelines.

This machine ensures spinal fixation devices can withstand cyclic torsional loads in vivo, reducing the risk of implant loosening or failure.

Product Features

Equipped with an imported torque motor, providing high servo precision and seamless integration of axial and torsional actuation, delivering up to 5 kN axial load and 20 N·m torque, suitable for various material tests.

Hydraulic assist system allows easy crossbeam lifting, locking, and specimen clamping, making test operations efficient and convenient.

High-precision imported torsion sensors combined with zero-backlash ball screws achieve load and torque measurement accuracy of ±0.5% of reading or ±0.05% of full scale (whichever is better).

Supports single-axis tension/compression, pure torsion, and combined tension-torsion control modes, enabling tensile, compressive, bending, shear, creep, and relaxation tests.

Technical Specifications

Parameter CategoryParameterSpecification
Axial Maximum load peak 4000 N
Dynamic load peak 4000 N
Static load peak 2100 N
Load measurement range 0.4%–100% F.S.
Load measurement accuracy ±0.2% of reading
Maximum loading frequency 2 Hz
Axial stroke 70 mm
Displacement resolution 0.1 μm
Torsion Maximum dynamic torque 30 N·m
Torque measurement range 0.4%–100% F.S.
Torque measurement accuracy ±0.2% of reading
Maximum torsional loading frequency 10 Hz
Rotation angle range unlimited
Maximum rotational speed 150 r/min
Angular resolution 0.018°
General Test space (vertical clamp distance) 0–950 mm
Net weight ~600 kg
Dimensions ~1170 × 700 × 2650 mm
Optional Fixtures Spinal rod/screw torsion fixtures, fusion device torsion fixtures, orthopedic screw tension-torsion fixtures, tapered fit strength test fixtures, femoral head torsion fixtures, etc.
Applications Dynamic and static torsion testing of surgical implants (e.g., intervertebral fusion devices), combined tension-torsion tests, single-axis tension/compression tests.

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