FDA warning letter · Medical Devices

King Systems Corp. dba Ambu, Inc.

Issued · Posted by FDA

FDA published a close-out letter on Jun 16, 2025. The passages below are from the original warning letter.

Selected passages from the FDA letter

Quoted FDA text from the published dataset. These selected excerpts are not the complete letter.

Passage 1

the King LTS-D branded supraglottic airway with gastric access lumen is adulterated under section 501(f)(1)(B) of the Act, 21 U.S.C. § 351(f)(1)(B), because your firm does not have an approved application for premarket approval (PMA) in effect pursuant to section 515(a) of the Act, 21 U.S.C. § 360e(a), or an approved application for an investigational device exemption under section 520(g) of the Act, 21 U.S.C. § 360j(g).

Passage 2

The device is also misbranded under section 502(o) the Act, 21 U.S.C. § 352(o), because your firm did not notify the agency of its intent to introduce the device into commercial distribution, as required by section 510(k) of the Act, 21 U.S.C. § 360(k).

Passage 3

Statements on your website (https://www.ambuusa.com/airway-management-andanaesthesia/laryngeal-tubes/product/ambu-king-lts-d-disposable-laryngeal-tube) promote the device with an intended use for pediatric populations weighing less than 5 kg, 5-12kg, 12-25kg, and 25-35 kg. However, the cleared indication for use for your device is for adult patients (K033189.pdf (fda.gov); K033186.pdf (fda.gov); K021634.pdf (fda.gov), and not for pediatric sizes.

Citations in the original letter

As cited in this historical letter, not a statement of current regulatory requirements.

  • 21 CFR 807.81(b)