# K970953: E-Type Speed Reducer Contra Angle

- Pathway: 510(k) (Traditional)
- Applicant: Nsk Nakanishi, Inc.
- Decided: Apr 15, 1997 after 29 days
- Product code: KMW (Handpiece, Rotary Bone Cutting)
- Device class: 2
- Regulation: 21 CFR 872.4120
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
6 later devices descend from it; 3 cite it directly.
0 of 7 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- None. FDA lists a 510(k) statement for it but has not posted the file, so its predicates are not known.

## Most influential descendants
- K092214: Chiropro L System (2009), 4 descendants of its own
- K140308: Mastersurg / Expertsurg (2014), 2 descendants of its own
- K213139: SURGmatic S15 L Pro (2021), 0 descendants of its own
- K193341: iCTmotor (WL-1) (2020), 0 descendants of its own
- K171155: Surgical Angle Handpiece, Surgical Straight Handpiece (2017), 0 descendants of its own

Source page: https://510kreport.com/device/K970953
Methodology: https://510kreport.com/methodology