# K032956: Accusonic a-Scan  Model, 24-4000

- Pathway: 510(k) (Traditional)
- Applicant: Accutome, Inc.
- Decided: Oct 10, 2003 after 18 days
- Product code: IYO (System, Imaging, Pulsed Echo, Ultrasonic)
- Device class: 2
- Regulation: 21 CFR 892.1560
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 2 generations back to K871536 (1987). 5 ancestors in all.
17 later devices descend from it; 2 cite it directly.
0 of 23 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K960765: Mentor Advent a/B System, Mentor Ophthalmics, Inc. (1996) Summary page 1.
- K860757: Ophthasonic a-Scan, Teknar, Inc. (1986) Summary page 1.
- K903666: Ophthasonic a/P Iii, Teknar, Inc. (1990) Summary page 1.
- K872726: DGH-3000A  a-Scan, Dgh Technology, Inc. (1987) Summary page 1.

## Cited in the summary but kept off the family tree
- K991306: DGH 4000 A-ScanFach. Not matched in our reading of the summary (scans can blur digits), so it is kept off the family tree

## Most influential descendants
- K082891: Lenstar, Model LS900 (2009), 14 descendants of its own
- K101182: Iolmaster 500 (2010), 10 descendants of its own
- K122418: Iolmaster 500 (2013), 9 descendants of its own
- K143275: IOLMaster700 (2015), 4 descendants of its own
- K170171: IOLMaster 700 (2017), 3 descendants of its own

## Indications for use
The instrument is used for measuring the axial length, anterior chamber depth and lens thickness of the eye. It also is used for calculating the optical power of the IOL to be implanted during cataract surgery.

Source page: https://510kreport.com/device/K032956
Methodology: https://510kreport.com/methodology