Construction and Implementation of a Biomaterials Properties

Construction and Implementation of a
Biomaterials Properties Database
Zi Wang
Department of Biological Engineering, Cornell University
This project aims to construct and implement a user-defined Matereality Database for
biomaterial properties data, and also create data transfer link between the database and external
analytical software.
This paper introduces a user-defined database that is constructed and implemented to help store
biomaterial data, and facilitate the use of these data in external analytical software. A well
organized database reflects your organization’s effective planning, management, and control. A
well organized database should employ database, technology, and above all else, clear thinking
and common sense. All four elements are to achieve database with minimum effort and
maximum effectiveness.
The database constructed for this study is data centered: data that come from experimental
procedures as well as formulation. While built from common components, the sum total of the
database would be unique to each set of conditions. The database requires both initial
organizational commitment and the continuous participation of the users to complete its
Trauma, degeneration and diseases often make surgical repair or replacement necessary. When a
person has a joint pain the main concern is the relief of pain and return to a healthy and
functional life style. This usually requires replacement of skeletal parts that include knees, hips,
finger joints, elbows, vertebrae, teeth, and repair of the mandible. The worldwide biomaterials
market is valued at close to $24,000M. Orthopaedic and dental applications represent
approximately 55% of the total biomaterials market. Orthopaedics products worldwide exceeded
$13 billion in 2000, an increase of 12 percent over 1999 revenues [1]. Expansion in these areas is
expected to continue due to number of factors, including the ageing population, an increasing
preference by younger to middle aged candidates to undertake surgery, improvements in the
technology and life style, a better understanding of body functionality, improved aesthetics and
need for better function. As biomaterials enjoy an ever expanding role in modern society, it
becomes very important to be able to organize and classify the various different biomaterials for
research purposes.
Classification of biomaterial in this database is performed based first on the material’s physical
structure. For this biomaterial database, there are three major classes with different physical
structures – tissue, body fluid, and composite material.
Tissue is a cellular organizational level intermediate between cells and a complete organism. A
tissue is an ensemble of cells, not necessarily identical, but from the same origin, that together
carry out a specific function. These are called tissues because of their identical functioning. In
this database, tissue is subdivided into different groups according to their structures and
properties (Table 1).
Table 1: Subdivision of Tissue
Body fluid, in the most basic terms, is a biological fluid — a liquid made by the body itself.
Body fluids can be excreted through sweat, secreted through bile, obtained through a needle
when blood is drawn, or they may develop from a blister or cyst. Body water is also a body fluid,
as is ear wax, amniotic fluid, cerebrospinal fluid, pus, and saliva, among many others. In this
database, body fluid is subdivided into just one category: blood.
Composite materials are bio-compatible materials. A biocompatible material (sometimes
shortened to biomaterial) is a synthetic or natural material used to replace part of a living system
or to function in intimate contact with living tissue. Biocompatible materials are intended to
interface with biological systems to evaluate, treat, augment or replace any tissue, organ or
function of the body. Biomaterials are usually non-viable, but may also be viable.
A biocompatible material is different from a biological material such as bone that is produced by
a biological system. Artificial hips, vascular stents, artificial pacemakers, and catheters are all
made from different biomaterials and comprise different medical devices. In this database, there
are no subdivisions for composite material.
The database platform used in this study is provided by Matereality. Inc. Matereality® is a first of
its kind, material data management technology that permits organizations to house all their
material properties on a single platform without limits. This 'No Limits' approach removes
existing hurdles that currently force organizations to sequester their data in disparate and
inconsistent formats such as limited capability databases, pdf document management systems.
Matereality® is similar in concept to virtual parts libraries. Virtual parts libraries, which offer
easy-to-download ready-to-use virtual product descriptions, like solid models of common parts
and fasteners, have three major advantages. First, the product descriptions are created as per the
standards of the parts suppliers, ensuring that the part is properly represented in the client’s
design. Second, the product developer does not have to waste valuable time and effort recreating
the geometry. Lastly, users are guaranteed that the same virtual component is viewed and used at
all levels of cooperation within and between enterprises. Matereality® offers the same advantages
for product developers cataloging quantitative material models.
For this project, an existing database platform is chosen over developing an entirely new
database platform because Matereality database offers excellent framework for biomaterial data
storage due to its expendability and ease of access. However, there are major obstacles in
inputting biomaterial data into the database in the initial stage of the project because
Matereality database is not designed specifically to suit biomaterials, therefore many important
material classifications, such as tissue and body fluid, have to be incorporated into the database.
Also, parameters specific to biomaterials such as water content are also missing from the initial
database setup, therefore these parameters also have to be added into the database framework.
In Matereality database, simple point data entries are recorded into different property categories.
These categories include thermal conductivity, thermal diffusivity, specific heat, density,
diffusion coefficient, and permeability. There are several important steps in data entering process,
first of which is to specify the type of data to be entered (Figure 1).
Figure 1: Selecting Project Information and Property to be entered.
Figure 2: Declaring parameter values and variable parameters.
In this step, the project name associated with this data entry is named and the type of material
property to be entered is selected. Next, the second most important step involves declaring
parameter values and any variable parameters (Figure 2). For every data entry, one of the
parameters must be constant for the entry process to continue. The third and last important step
in data entry procedures is declaring materials (Figure 3).
Figure 3: Declaring the material used from which the data are extracted.
In this step, the material used from which the data are extracted is declared. If the material is not
listed in the database, a new material can be created with the appropriate class and subclass
names (Figure 3, red circle). These three steps are of the utmost importance in data entry process
because the data in the database are distinguished from each other based on the information
processed in these three steps. More detailed procedures that are needed to accomplish the data
entry are in Appendix II.
Other than simple data entry, the database is able to display other types of data, one of them
being equation. Equation, as a specific type of data entry, needs to be entered via an
administrator through a XML file that code specifically for the equation (Figure 4).
Figure 4: XML code fragment that declares an thermal conductivity equation.
Equation entry into the database has proven to be the biggest obstacle in constructing the
database. At the initial stage of the construction, entering equation as a form of data into the
database is not technically possible. Through negotiations with the database developers and by
working together with technicians from Matereality, inc., it is now possible to enter equations
into the database. For an equation to be entered into the database, it has to be first written in
XML format (Figure 4) in frames that are acceptable by the database. Then the XML codes are
loaded into the database structure and become part of the general database framework. The
results are that the equations declared by the XML code can now be viewed in the database as a
data entry (Figure 5)
Figure 5: Graphic display of equation entered into the database.
One of the most important parts of this database implementation is the ability to transfer data to
external analytical software, in this case, COMSOL. COMSOL is a multiphysics software
designed to solve heat and mass transfer problems. The ability to import material data from
database and store them in a user-defined material library in COMSOL offers great flexibility
and advantage to researchers when trying to apply various properties of materials to solve
The major problem in achieving this is importing data from database in a form that is readable by
COMSOL. Because COMSOL has a predefined XML structure for material properties, the
challenge is to formulate a XML file convertor that would convert existing data in the
Matereality database into XML file that would be accepted by COMSOL (Appendix I). The
resulting XML files can then be imported into COMSOL’s directory for later usages (Figure 6,
Figure 6: A XML file containing a biomaterial’s property information from Matereality database.
Figure 7: Directory in COMSOL where the XML file shown in Figure 6 can be imported.
The aim of this project is to create a biomaterial property database and be able to transfer data
from the database to external analytical software, COMSOL. At the end of the project, the
database contains material property data from a range of biomaterials, and is able to export XML
file that can be read by COMSOL. The Matereality database for biomaterials displays flexibility
in dealing with demanding situations and expandability in dealing with unknown territory.
Despite the accomplishments, there are still aspects of this database that can be improved. The
part need to be improved most is the equation entry process. Despite the efforts made during this
project, the process of entering equation is still very user-unfriendly and also very restrictive. In
the future, such aspects of the database need to be improved.
Appendix I: Data Convertor: from database to XML file
This work is done under collaboration from Matereality. Inc.
<xsl:stylesheet version="1.0"
exclude-result-prefixes="msxsl merUtil tensile compressive">
<xsl:output method="xml" encoding="utf-8" indent="yes" />
<xsl:strip-space elements="*" />
<xsl:variable name="glossary" select="document('glossary.xml')" />
<!-- DocRoot -->
<xsl:template match="//MerDocRoot">
<lib type="class">
<version type="class">
<name>COMSOL 3.5</name>
<mat type="array">
<xsl:apply-templates select="//MERMaterial" />
<xsl:template match="MERMaterial" >
<object type="class">
<name><xsl:value-of select="Name" /></name>
<appearance>ROUGH SPECULAR 230 120 50 DIFFUSE 229 131 76
AMBIENT 230 230 230 NOISESCALE 0.5 NOISEFREQ 0.3</appearance>
<variables type="class" >
<xsl:apply-templates select=".//MERPropertyMeasurementResult"/>
<xsl:template match="MERPropertyMeasurementResult[ ResultName = 'Poissons
Ratio' ]">
<nu><xsl:value-of select="ResultValue" /></nu>
<xsl:template match="MERPropertyMeasurementResult[ ResultName = 'Tensile
Modulus' ]">
<E><xsl:value-of select="ResultValue" />[Pa]</E>
<xsl:template match="MERPropertyMeasurementResult[ ResultName = 'Thermal
Conductivity' ]">
<k><xsl:value-of select="ResultValue" />[W/(m*K)]</k>
<xsl:template match="MERPropertyMeasurementResult[ ResultName = 'Specific
Heat' ]">
<C><xsl:value-of select="ResultValue" />[J/(kg*K)]</C>
<xsl:template match="MERPropertyMeasurementResult[ ResultName = 'Solid
Density' ]">
<rho><xsl:value-of select="ResultValue" />[kg/m^3]</rho>
<xsl:template match="MERPropertyMeasurementResult" />
Appendix II: Matereality Database User Manual
Compiled by the author of this paper
Cornell University
Table of Content
I. Getting Started
............................................................................................................... 15
II. Load Your Data
............................................................................................................... 18
III. Accessing and Editing Existing Data …......................................................................... 27
IV. Accessing Model …........................................................................................................ 29
V. Data Transfer to COMSOL ….......................................................................................... 34
I. Getting Started
Click on “Login” as circled in the figure below.
Enter Passport and Password accordingly.
After logging in, click on “My Database” as shown in the figure below. You can chose a range of
acitivities with regard to your database at this interface.
II. Load Your Data
Click on the “Load Data” as circled in the figure below.
Enter Project ID as shown in circle 1 and the appropriate property as shown in circle 2.
Check for Project ID as shown in circle 3, select appropriate test method as shown in circle 4, if
the test method is unknown, select unknown. Select test data and instrument used as shown in
circle 5.
Enter appropriate parameter values and declare variables. At least one parameter value must be a
constant, this value should be declared under the “Value” column with the corresponding
parameter. If there are variable parameter values, click the “Variable” box with the
corresponding parameter. Proceed to the next step.
Select appropriate property results, then proceed to next step.
Enter the appropriate variable values as shown in circle 6, and click on “Add Data” as shown in
circle 7 to enter your data.
After entering data, click on “Material” as circled in the figure below to enter material
You can choose from existing materials in the database, or you can define your own material as
circled in the figure below.
After entering material information, click “Save” as circled in the figure below to save your entry
into the database.
III. Accessing and Editing Existing Data
On the interface shown in the figure below, click on “Manage” as circled.
For editing your data, click on “Editing” as circled in the figure below, then choose your desired
data entry for editing.
IV. Accessing Model
For some data, there are built in models available. To access model, click on “View” as circled in
the figure below.
To display model, click on “Model” as circled in the figure below.
Choose the appropriate model avaiblable, an example is shown as circled in the figure below.
Figures below shows an example, which has a specific heat equation displayed.
V. Data Transfer to COMSOL
In the beginning interface, a link to COMSOL can be found as circled in the figure below.
Select appropriate search constraints for available data.
The figure below displays a range of avaible data entry for transfer to COMSOL
After selecting a data entry, click “Start Conversion” as circled in the figure shown below.
After conversion completion, you can choose “View Model”, which displays a XML file
containing the information in this data entry in the format required for COMSOL, and
“Download”, which will download the XML file to be used for COMSOL.
Appendix III: Reference
[1] G. Heness and B. Ben-Nissan. Innovative Bioceramics, Materials Forum, Vol. 27, 2004.
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