Edge Welded Bellows for Medical Technology
In medical technology, the margin for error is zero. From the rotating gantry of a CT scanner spinning at 0.3 seconds per revolution to the sub-millimeter precision of a robotic surgery system, edge welded bellows serve as the hermetic barrier between patient safety and system reliability. Alpha Technology manufactures bellows that meet the unique intersection of requirements in medical devices: biocompatibility, cleanroom manufacturing, precise spring rates, and absolute leak integrity — all backed by full traceability documentation.
Medical imaging and treatment systems operate under demanding mechanical conditions. A CT scanner’s rotating assembly may accumulate over 50 million cycles during its service life while maintaining precise balance and vacuum integrity. Our Long Travel Motion Control Bellows are designed for exactly this profile — high cycle life with stable spring characteristics that don’t drift over time.
Medical Applications
- CT & MRI Scanner Rotating Assemblies: The vacuum envelope of an X-ray tube or the rotating gantry of a CT demands bellows that can handle high-speed rotation without generating particulates. Our edge welded bellows are assembled in Class 10,000 cleanrooms, ensuring zero organic contamination. Non-magnetic Inconel configurations are available for MRI-proximity applications where even ppm-level magnetic materials are unacceptable.
- Radiotherapy Beam Positioning: Linear accelerators for cancer treatment require precise, backlash-free motion of the beam collimator and patient positioning table. Our Short Stroke Precision Bellows provide smooth, repeatable actuation with spring rates controlled to ±5%, enabling sub-millimeter beam targeting accuracy.
- Surgical Robotics: Robotic-assisted surgical platforms use bellows for instrument drive seals that must withstand repeated sterilization cycles. Edge welded bellows with electropolished surfaces prevent bacterial adhesion and facilitate validated cleaning protocols.
Regulatory-Ready Manufacturing
We support medical device manufacturers’ quality systems with comprehensive documentation packages. Every lot includes:
- Full material certifications with heat lot traceability
- Helium leak test reports (1×10⁻¹⁰ atm·cc/sec sensitivity)
- Dimensional inspection data
- Surface finish measurements where specified
Material options — including SS316L for general medical vacuum, AM350 for high-cycle dynamic seals, and Inconel for MRI-compatible non-magnetic applications — are compared in detail on our Material Selection Guide. For design integration support, our engineering team offers complimentary drawing review to ensure your bellows specification matches your device’s regulatory and performance requirements.