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U.S. Department of Health and Human Services

Recognized Consensus Standards: Medical Devices
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Part B: Supplementary Information Sheet (SIS)
FR Recognition List Number 038 Date of Entry 01/27/2015 
FR Recognition Number 4-136
Standard
ASTM  F2504-05 (Reapproved 2022)
Standard Practice for Describing System Output of Implantable Middle Ear Hearing Devices
Scope/Abstract
1.1 This practice defines means for describing system performance (ex vivo) and, in particular, system output of an implantable middle ear hearing device (IMEHD) by measuring a physical quantity that is relevant to the insertion gain and output level of the IMEHD when implanted in the patient.
1.2 This practice is similar to headphone calibration on an artificial ear in which the sound pressure level (in decibel sound pressure level (SPL)) measured in the artificial ear can be converted to patient hearing level (in decibel hearing level (HL)) using a known transfer function, as defined by ANSI 3.7. These measurements can then be used to predict system parameters relevant for patient benefit such as functional gain, maximum output, and variability. Measurements defined in this practice should be useful for patients, clinicians, manufacturers, investigators, and regulatory agencies in making comparative evaluations of IMEHDs.
1.3 The values given in SI units are to be considered the standard.
Extent of Recognition
Complete standard
Rationale for Recognition
This standard is relevant to medical devices and is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.
Relevant FDA Guidance and/or Supportive Publications*
Guidance for Industry and FDA Staff Implantable Middle Ear Hearing Device Document issued on: August 1, 2003

Appropriate Use of Voluntary Consensus Standards in Premarket Submissions for Medical Devices - Guidance for Industry and Food and Drug Administration Staff, issued September 2018.
FDA Technical Contact
 Vasant Dasika
  FDA/OC/CDRH/OPEQ/OHTI/DHTIB/
  301-796-5365
  Vasant.Dasika@fda.hhs.gov
Standards Development Organization
ASTM ASTM International http://www.astm.org/
FDA Specialty Task Group (STG)
Dental/ENT
*These are provided as examples and others may be applicable.
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