# K962455: Four-Channel Preamplifier

- Pathway: 510(k) (Traditional)
- Applicant: Cadwell Laboratories, Inc.
- Decided: Jan 13, 1997 after 202 days
- Product code: GWF (Stimulator, Electrical, Evoked Response)
- Device class: 2
- Regulation: 21 CFR 882.1870
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 1 generation back to K924723 (1993). 2 ancestors in all.
37 later devices descend from it; 2 cite it directly.
0 of 40 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K924723: Cadwell Sierra, Cadwell Laboratories, Inc. (1993) Summary page 1.
- K931428: Cadwell 6200 a, Cadwell Laboratories, Inc. (1993) Summary page 1.

## Most influential descendants
- K112718: Nuvasive NVM5 System (2012), 35 descendants of its own
- K123307: Nuvasive NVM5 System (2013), 33 descendants of its own
- K132694: Nuvasive NVM5 System (2014), 24 descendants of its own
- K141968: Nuvasive NVM5 System (2014), 23 descendants of its own
- K143641: NuVasive NVM5 System (2015), 22 descendants of its own

## Indications for use
The general purpose of the proposed device is identical to the predicate device: "to perform the measurements needed for electromyography (EMG), nerve conduction velocity (NCV, F wave, and H reflex), and evoked potentials (brainstem, visual, and somatosensory), and repetitive nerve stimulation." The purpose of the proposed device is to allow compatibility with high-impedance electrodes. The proposed device allows electrode inputs to be made closer to the source of the signal for reduced signal noise during procedures requiring high-impedance electrodes.

Source page: https://510kreport.com/device/K962455
Methodology: https://510kreport.com/methodology