Standard Practice for Characterization of Particles

SIGNIFICANCE AND USE
The biological response to materials in the form of small particles, as from wear debris, often is significantly different from that to the same materials as larger implant components. The size and shape (morphology) of the particles may have a major effect on the biological response; therefore, this practice provides a standardized nomenclature for describing particles. Such a unified nomenclature will be of value in interpretation of biological tests of responses to particles, in that it will facilitate separation of biological responses associated with shape from those associated with the chemical composition of debris.
The quantity, size, and morphology of particles released as wear debris from implants in vivo may produce an adverse biological response which will affect the long term survival of the device. Characterization of such debris will provide valuable information regarding the effectiveness of device designs or methods of processing components and the mechanisms of wear.
The morphology of particles produced in laboratory tests of wear and abrasion often is affected by the test conditions, such as the magnitude and rate of load application, device configuration, and test environment. Comparison of the morphology and size of particles produced in vitro with those produced in vivo will provide valuable information regarding the degree to which the method simulates the in vivo condition being modeled.
SCOPE
1.1 This practice covers a series of procedures for characterization of the morphology, number, size, and size distribution of particles. The methods utilized include sieves, optical, SEM, and electrooptical.
1.2 These methods are appropriate for particles produced by a number of different methods. These include wear test machines (Test Method F732), total joint simulation systems (Guides F1714 and F1715), abrasion testing, methods for producing particulates, such as shatter boxes or pulverizors, commercially available particles, and particles harvested from tissues in animal or clinical studies.
1.3 The debris may include metallic, polymeric, ceramic, or any combination of these.
1.4 The digestion procedures to be used and issues of sterilization of retrieved particles are not the subject of this practice.
1.5 A classification scheme for description of particle morphology is included in Appendix X3.
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.7 As a precautionary measure, removed debris from implant tissues should be sterilized or minimally disinfected by an appropriate means that does not adversely affect the particulate material. 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.

General Information

Status
Historical
Publication Date
31-May-2010
Current Stage
Ref Project

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F1877 − 05(Reapproved 2010)
Standard Practice for
1
Characterization of Particles
This standard is issued under the fixed designation F1877; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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1.1 This practice covers a series of procedures for charac- 2.1 ASTM Standards:
terization of the morphology, number, size, and size distribu- C242 Terminology of Ceramic Whitewares and Related
tion of particles. The methods utilized include sieves, optical, Products
SEM, and electrooptical. C678 Test Method for Determination of Particle Size Distri-
bution of Alumina or Quartz Using Centrifugal Sedimen-
1.2 Thesemethodsareappropriateforparticlesproducedby
3
tation (Withdrawn 1995)
a number of different methods. These include wear test
E11 Specification for Woven Wire Test Sieve Cloth and Test
machines (Test Method F732), total joint simulation systems
Sieves
(Guides F1714 and F1715), abrasion testing, methods for
E161 Specification for Precision Electroformed Sieves
producing particulates, such as shatter boxes or pulverizors,
E766 Practice for Calibrating the Magnification of a Scan-
commercially available particles, and particles harvested from
ning Electron Microscope
tissues in animal or clinical studies.
E1617 Practice for Reporting Particle Size Characterization
1.3 The debris may include metallic, polymeric, ceramic, or
Data
any combination of these.
F561 Practice for Retrieval and Analysis of Medical
Devices, and Associated Tissues and Fluids
1.4 The digestion procedures to be used and issues of
sterilization of retrieved particles are not the subject of this F660 Practice for Comparing Particle Size in the Use of
Alternative Types of Particle Counters
practice.
F661 Practice for Particle Count and Size Distribution Mea-
1.5 A classification scheme for description of particle mor-
surement in Batch Samples for Filter Evaluation Using an
phology is included in Appendix X3.
Optical Particle Counter (Discontinued 2000) (Withdrawn
3
1.6 The values stated in SI units are to be regarded as
2000)
standard. No other units of measurement are included in this
F662 Test Method for Measurement of Particle Count and
standard.
Size Distribution in Batch Samples for Filter Evaluation
1.7 As a precautionary measure, removed debris from Using an Electrical Resistance Particle Counter (Discon-
3
implanttissuesshouldbesterilizedorminimallydisinfectedby tinued 2002) (Withdrawn 2002)
an appropriate means that does not adversely affect the F732 Test Method for Wear Testing of Polymeric Materials
particulate material. This standard does not purport to address Used in Total Joint Prostheses
all of the safety concerns, if any, associated with its use. It is F1714 GuideforGravimetricWearAssessmentofProsthetic
the responsibility of the user of this standard to establish Hip Designs in Simulator Devices
appropriate safety and health practices and determine the F1715 Guide for Wear Assessment of Prosthetic Knee De-
3
applicability of regulatory limitations prior to use. signs in Simulator Devices (Withdrawn 2006)
1 2
ThispracticeisunderthejurisdictionofASTMCommitteeF04onMedicaland For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Surgical Materials and Devices and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
F04.16 on Biocompatibility Test Methods. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved June 1, 2010. Published September 2010. Originally the ASTM website.
ε1 3
approved in 1998. Last previous edition approved in 2005 as F1877 – 05 . DOI: The last approved version of this historical standard is referenced on
10.1520/F1877-05R10. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F1877 − 05 (2010)
3. Terminology detailed studies, several methods are described that may be
utilized for numerically characterizing their dimensions, size
3.1 Definitions of Terms Specific to This Standard:
distribution, and number.
3.1.1 agglomerate, n—a jumbled mass or collection of two
or more particles or aggregates, or a combination thereof, held
5. Significance and Use
together by relatively weak cohesive forces caused by weak
chemical bonding or an electrostatic surface charge generated
5.1 Thebiologicalresponsetomaterialsintheformofsmall
by handling or
...

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