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The requirements apply to sterile and nonpyrogenic assemblies or devices in contact directly or indirectly with the cardiovascular system, the lymphatic system, or cerebrospinal fluid. This includes, but is not limited to, solution administration sets, extension sets, transfer sets, blood administration sets, intravenous catheters, implants extracorporeal oxygenator tubings and accessories, dialysers and dialysis tubing and accessories, heart valves, vascular grafts, intramuscular drug delivery catheters, and transfusion and infusion assemblies. These requirements do not apply to orthopedic products, latex gloves, or wound dressings.

Proceed as directed for Sterilized Devices under Sterility Tests 71.

Bacterial Endotoxins—
Proceed as directed under Bacterial Endotoxins Test 85.
For medical devices, the endotoxin limit is not more than 20.0 USP Endotoxin Units per device except that for those medical devices in contact with the cerebrospinal fluid the limit is not more than 2.15 USP Endotoxin Units per device.
A device that fails this test can be retested once by another Bacterial Endotoxins test. For devices that cannot be tested by the Bacterial Endotoxins Test 85 because of nonremovable inhibition or enhancement, the Pyrogen Test 151 is applied.
Preparation of Devices— Select not less than 3 and not more than 10 devices. Rinse or soak the devices with LAL Reagent Water. The volume of rinsing or extracting solution may be adjusted for the size and configuration of the device.
For devices labeled “nonpyrogenic fluid pathway,” flush the fluid pathway with extracting fluid that has been heated to 37 ± 1.0, keeping the extracting fluid in contact with the relevant pathway for not less than 1 hour at controlled room temperature. Extracts may be combined, where appropriate. The endotoxin limit for the rinsing or extracting solution is calculated by the formula:
(K × N) / (V)
where K is equal to the amount of endotoxin allowed per device, N is equal to the number of devices tested, and V is equal to the total volume of the extract or rinse. If the undiluted rinsing or extracting solution is unsuitable for the Bacterial Endotoxins Test 85, repeat the inhibition or enhancement test after neutralization and removal of the interfering substances or after the solution has been diluted by a factor not exceeding the Maximum Valid Dilution. The Maximum Valid Dilution for devices is calculated by dividing the endotoxin limit by the labeled sensitivity of the LAL reagent used.

For samples that cannot be tested by the Bacterial Endotoxins Test because of nonremovable inhibition or enhancement of the test, the Pyrogen Test 151 is applied. Select 10 devices, and obtain a pooled effluent, utilizing preparation methods appropriate to the device as directed for Bacterial Endotoxins, but with volumes of rinse or extraction fluid not to exceed 40 mL of sterile saline TS per device. The requirements of the Pyrogen Test 151 are met.

Other Requirements—
The portions of medical devices that are made of plastics or other polymers meet the requirements specified for Biological Tests—Plastics and Other Polymers under Containers—Plastics 661; those made of elastomers meet the requirements under Elastomeric Closures for Injections 381. If a class designation for elastomers, plastics, or other polymers is needed, perform the appropriate in vivo tests indicated in the general test chapter Biological Reactivity Tests, In Vivo 88.

Auxiliary Information—
Staff Liaison : Radhakrishna S Tirumalai, Ph.D., Scientist
Expert Committee : (GTMDB05) General Toxicology and Medical Device Biocompatibility
USP31–NF26 Page 124
Phone Number : 1-301-816-8339