21 CFR § 880.6970 - Liquid crystal vein locator.

---
identifier: "/us/cfr/t21/s880.6970"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 880.6970 - Liquid crystal vein locator."
title_number: 21
title_name: "Food and Drugs"
section_number: "880.6970"
section_name: "Liquid crystal vein locator."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "H"
subchapter_name: "MEDICAL DEVICES"
part_number: "880"
part_name: "GENERAL HOSPITAL AND PERSONAL USE DEVICES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 351, 360, 360c, 360e, 360j, 360 371."
regulatory_source: "45 FR 69682, Oct. 21, 1980, unless otherwise noted."
cfr_part: "880"
---


# 880.6970 Liquid crystal vein locator.

(a) *Identification.* A liquid crystal vein locator is a device used to indicate the location of a vein by revealing variations in the surface temperature of the skin by displaying the color changes of heat sensitive liquid crystals (cholesteric esters).

(b) *Classification.* Class I (general controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter, subject to the limitations in § 880.9.

[45 FR 69682, Oct. 21, 1980, as amended at 54 FR 25050, June 12, 1989; 66 FR 38807, July 25, 2001]