Covidien 313363 Rev L INVOS Cerebral/Somatic System Preamp 3/4

Covidien 313363 Rev L INVOS Cerebral/Somatic System Preamp 3/4

• Model: 313363

The Covidien 313363 Rev L INVOS Preamp 3/4 is a modular amplification unit designed to extend the INVOS cerebral/somatic oximetry system’s channel capacity. In setups where clinicians wish to monitor four separate sites (for example, bilateral cerebral plus bilateral somatic), this preamp module becomes indispensable. Because the INVOS system is built with modular architecture, the 3/4 preamp plugs into or communicates with the main device body, handling signal conditioning for the optical detectors associated with channels 3 and 4. Its “Rev L” revision suggests an iteration that may include improvements in stability, noise reduction, or manufacturing tolerances compared to earlier versions.

In daily clinical use, the preamp is essentially transparent — it does its job in the background, providing clean, amplified signals from photodetectors (via the NIRS sensors) to the INVOS system’s processing electronics. The quality of that amplification and signal integrity is vital, because the INVOS technology depends on small changes in near‑infrared absorption to infer regional oxygen saturation (rSO₂). The system subtracts superficial (scalp, extracerebral) signals from deeper readings to isolate the relevant cerebral or somatic tissue signal, so low-noise amplification is crucial to maintain fidelity.

From a deployment perspective, the 3/4 preamp module enables flexibility and scalability. When a hospital or surgical center already operates a two-channel INVOS setup but later needs to monitor additional sites, adding this preamp allows extension without replacing the entire oximeter. Though the public documentation is light on the electrical and mechanical minutiae, the unit’s listing in regulatory databases (as the “Preamplifier B, Channel 3/4”) confirms its role in certified INVOS systems and underscores that it is not a stand‑alone device but part of a trusted medical monitoring platform.