The Permobil seat back cushion part number 1826168 (which is frequently cross-referenced with updated manufacturing sequences like 330818) is an OEM medical-grade positioning component designed explicitly for Permobil's premier seating systems. 
Physical Cushion Dimensions
  • Width: 18 inches (approx. 455 mm) measured horizontally across the torso support zone.
  • Height/Length: 18 inches (approx. 455 mm) vertically.
  • Contour Thickness: Built with a varying profile ranging between 2.75 to 4.25 inches thick. It utilizes an intentional ergonomic dip down the spine to encourage postural centering while maintaining thick, supportive guidance on the lateral sides of the trunk. 
Detailed Product Description
  • Material Cover Type: This specific part number represents a Leatherette (medical vinyl) cover finish. The surface material is non-porous, fluid-resistant, and designed for rigorous wipe-down sanitization protocol in clinical or daily settings. 
  • Internal Composition: It relies on an anatomically molded, dual-density polyurethane foam core. This design provides soft pressure distribution across the thoracic vertebrae and high-density, firmer structural foam along the base edges to prevent pelvic and spinal slouching.
Seat Size Compatibility
To guarantee safe clinical utilization, this cushion must map perfectly to the underlying seating dimensions:
  • Seating Framework Footprint: This cushion fits a Standard 18" x 18" adult backrest layout.
  • Backrest Pan Profile: It requires an 18" wide metal backrest pan shell. Using this on narrower 14"–16" frames or wider 20"–22" frames will leave critical support gaps or cause unsafe material overhang. 
Permobil Power Wheelchair Model Compatibility
This backrest cushion belongs to the globally utilized Corpus Seating System infrastructure (including Corpus 3G, Ergo, and VS seating configurations). It natively mounts to the following Permobil wheelchair bases: 
  • F-Series (Front-Wheel Drive): Permobil F3 Corpus and F5 Corpus / F5 VS.
  • M-Series (Mid-Wheel Drive): Permobil M3 Corpus and M5 Corpus.
  • Heavy Duty & Legacy Platforms: Permobil M300 Corpus HD as well as traditional C300 and C500 wheelchair bases running an adult-sized Corpus seating assembly. 


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Used items for sale have been cleaned and sanitized and have been tested - items listed are in good working order unless otherwise specified. Please refer to your owner's manual for compatibility.

 

Shipping - Items are shipped within 3 business days after receipt of payment. 

No warranty - items are used and there is no way to be certain how long they will last.

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