# K003928: Townley Transfacetpedicular Screw Fixation System

- Pathway: 510(k) (Special)
- Applicant: Medtronic Sofamor Danek, Inc.
- Decided: Jan 17, 2001 after 28 days
- Product code: MRW (System, Facet Screw Spinal Device)
- Device class: U
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
166 later devices descend from it; 5 cite it directly.
0 of 167 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- None. FDA has not posted a summary or statement for it, so its predicates are not known.

## Most influential descendants
- K012773: Discovery Facet Screw Fixation System (2001), 158 descendants of its own
- K071420: Chameleon Fixation System (2008), 153 descendants of its own
- K131417: Facet Fixx (2013), 130 descendants of its own
- K141376: Inertia Pedicle Screw System, Honour Spacer System, Facet Fixx, Struxxure Anterior Cervical Plate and Screws (2014), 106 descendants of its own
- K181435: ATEC Cervical Spacer System (2018), 100 descendants of its own

Source page: https://510kreport.com/device/K003928
Methodology: https://510kreport.com/methodology