# K921441: Interferential Stimulator Model Inf 4150/a

- Pathway: 510(k) (Traditional)
- Applicant: Biomedical Life Systems, Inc.
- Decided: May 8, 1992 after 44 days
- Product code: LIH (Interferential Current Therapy)
- Device class: 2
- Regulation: 21 CFR 882.5890
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
34 later devices descend from it; 1 cites it directly.
0 of 35 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
- K952683: Apex Medical Corp. Portable Interferential Stimulation Device (1997), 33 descendants of its own
- K060246: Infrex (2006), 14 descendants of its own
- K072123: Homewave Neuromodulations Pain Therapy Device (2008), 11 descendants of its own
- K161154: Smartpatch PNS MicroLead and Accessories, Smartpatch PNS Stimulator, Pads, and Accessories, Smartpatch PNS MicroLead and Introducer, Smartpatch PNS Pads, 4 Packs (2016), 9 descendants of its own
- K170902: Sprint System, Single Procedure Kit, Sprint System with Pad II, Single Procedure Kit, Sprint System, Multi-Procedure Kit, Sprint System, Sterile Components Kit, Sprint System, Stimulator Kit (2017), 7 descendants of its own

Source page: https://510kreport.com/device/K921441
Methodology: https://510kreport.com/methodology