ASTM F1497-99a

This test method determines a uniform and repeatable measurement of the laser resistance of the shaft of a tracheal tube. Most of the variables involved in laser ignition of a tracheal tube have been fixed in order to establish a basis for comparison. This measurement can be used to compare tracheal tubes having differing designs of laser protection.

There are a large number and range of variables involved in laser ignition of a tracheal tube. A change in one variable may affect the outcome of the test. Caution should be observed since the direct applicability of the results of this test method to the clinical situation has not been fully established.

Since it is conceivable that an oxygen enriched atmosphere may be encountered in the clinical situation, either intentionally or unintentionally, the test is performed in an environment of 98 (±2 %) oxygen.

A flow rate of 1 L/min in a 6.0-mm inner diameter tube was chosen as the best condition for tube ignition and establishment of a fire.

Opportunities for Development—Variations of this test method can be applied to study the effect of changing the test conditions but are outside the scope of this test method. For example, variation of the respiratory gas flow rate or different breathing gas mixtures may affect the laser resistance of the tracheal tube. Use of modes of laser energy delivery other than continuous, (for example, pulsed, superpulse, q-switched, and ultrapulsed), may alter the tracheal tube’ignition characteristics. Also, tubes of different diameter will have laser resistance different from that defined in this test method.

1.1 This test method covers a standard means of testing the laser resistance of the shaft of a tracheal tube.

1.2 This test method addresses the laser resistance of the shaft of the tracheal tube. Other components of the system, such as the inflation system and cuff, are outside the scope of this test method.

1.3 Caution should be observed since the direct applicability of the results of this test method to the clinical situation has not been fully established.

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 This test method should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment that takes into account all of the factors that are pertinent to an assessment of the fire hazard of a particular end use.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Notes 1 through 6.