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A1.1.1 This test method describes methods for static four-point bend testing of intrinsic, structural properties of intramedullary fixation devices (IMFDs) for surgical fixation of the skeletal system. This test method includes bend testing in a variety of planes relative to the major anatomic planes. The purpose is to measure bending strength and bending stiffness intrinsic to the design and materials of IMFDs.

A1.1.2 This test method is designed specifically to test IMFD designs that have a well-defined working length (WL) of uniform open or closed cross section throughout the majority of its length (WL ≥ 10× diameter) and is to be applied to the full length of the diaphysis of a femur, tibia, humerus, radius, or ulna. This is not applicable to IMFDs that are used to fix only a short portion of the diaphysis of any of the long bones or the diaphysis of small bones such as the metacarpals, metatarsals, phalanges, and so forth.

A1.1.3 This test method is not intended to test the extrinsic properties of any IMFD, that is, the interaction of the device with bone or other biologic materials.

A1.1.4 This test method is not intended to define case-specific clinical performance of these devices, as insufficient knowledge to predict the consequences of the use of any of these devices in individual patients is available.

A1.1.5 This test method is not intended to serve as a quality assurance document, and thus, statistical sampling techniques for batches from production of IMFDs are not addressed.

A1.1.6 This test method may not be appropriate for all types of implant applications. The user is cautioned to consider the appropriateness of the method in view of the devices being tested, the material of their manufacture, and their potential applications.

A1.1.7 The values stated in SI units are to be regarded as the standard.

A1.1.8 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.

A2.1.1 This test method covers the test procedure for determining the torsional stiffness of intramedullary fixation devices (IMFDs). The central part of the IMFD, with a straight and uniform cross-section and away from screw holes or other interlocking features, is tested in a static test.

A2.1.2 IMFDs are indicated for surgical fixation of the skeletal system and are typically used in the femur, tibia, humerus, radius, or ulna. Devices that meet the IMFD specifications of Section 4, and other similar devices, are covered by this test method.

A2.1.3 This test method does not intend to test or provide information that will necessarily relate to the properties of fixation that an IMFD may obtain in a bone or any other connection with other devices.

A2.1.4 This test method is not intended to define case-specific clinical performance of these devices, as insufficient knowledge to predict the consequences of the use of any of these devices in individual patients is available.

A2.1.5 This test method is not intended to serve as a quality assurance document. Thus, statistical sampling techniques for batches from the production of IMFDs are not addressed.

A2.1.6 Unless otherwise indicated, the values stated in SI units are to be regarded as the standard. The values in parentheses are given for information only.

A2.1.7 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.

A3.1.1 This test method covers the test procedure for performing cyclic bending fatigue testing of intramedullary fixation devices (IMFDs). The central part of the IMFD, with a straight and uniform cross section and away from screw holes or other interlocking features, is tested in cyclic four-point bending. This method may be used to determine a fatigue life at a specified maximum bending moment or to estimate a fatigue strength for a specified number of cycles.

A3.1.2 IMFDs are indicated for surgical fixation of the skeletal system and are typically used in the femur, tibia, humerus, radius, or ulna. Devices that meet the IMFD specifications of Section 4, and other similar devices, are covered by this test method.

A3.1.3 This test method is not intended to test or provide information that will necessarily relate to the properties of fixation which an IMFD may obtain in a bone, or any other connection with other devices.

A3.1.4 This test method is not intended to define case-specific clinical performance of these devices, as insufficient knowledge to predict the consequences of the use of any of these devices in individual patients is available.

A3.1.5 This test method is not intended to serve as a quality assurance document, and thus, statistical sampling techniques for batches from the production of IMFDs are not addressed.

A3.1.6 Unless otherwise indicated, the values stated in SI units are to be regarded as the standard. The values in parentheses are given for information only.

A3.1.7 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.

A4.1.1 This test method covers the test procedure for performing cyclic bending fatigue testing of locking screws used for the fixation of intramedullary fixation devices (IMFDs). The central part of the screw is tested in cyclic three-point or four-point bending. This method may be used to determine a fatigue life at a specified maximum bending moment or to estimate a fatigue strength for a specified number of cycles.

A4.1.2 This test method is specifically applicable to screws described by Specification F 543, which are used to provide fixation of IMFDs in bone by transversely crossing through the IMFD from one cortex to the other. This test method may or may not be applicable to other types of orthopaedic bone screws.

A4.1.3 This test method does not address the connection between the IMFD and the screw.

A4.1.4 This test method is not intended to define case-specific clinical performance of these devices, as insufficient knowledge to predict the consequences of the use of any of these devices in individual patients is available.

A4.1.5 This test method is not intended to serve as a quality assurance document, and thus, statistical sampling techniques for batches from the production of screws are not addressed.

A4.1.6 Unless otherwise indicated, the values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only.

A4.1.7 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.

Significance and Use

A2.4.1 This test method describes a static torsional test to determine the torsional stiffness of the central and uniform portion of an intramedullary fixation device.

A2.4.2 This test method may not be appropriate for all types of implant applications. The user is cautioned to consider the appropriateness of the method in view of the devices being tested and their potential application.

Keywords

bend testing; definitions; extraction; fatigue test; fracture fixation; implants; intramedullary fixation devices; orthopaedic medical device; performance; surgical devices; terminology; test methods; torsion test; trauma; Intramedullary fixation devices (IMFDs); Mechanical performance considerations; Orthopaedic medical devices--specifications; Performance--surgical materials/applications (specifications); Skeletal system; Static tests--orthopaedic materials/applications; Structural medical applications; Terminology--medical/surgical systems/applications; Torsion testing--medical/surgical devices/applications; ICS Number Code 11.040.40 (Implants for surgery, prothetics and orthotics)

To find similar documents by ASTM Volume:

13.01 (Medical and Surgical Materials and Devices)

To find similar documents by classification:

11.040.40 (Implants for surgery, prosthetics and orthotics Including pacemakers Ophthalmic implants, see 11.040.70)

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