Overview of Injury Research - Penn Engineering

Overview of Injury Research - Penn Engineering

Instron Uniaxial Tensile Testing: Structural & Material Properties of Sutures Group 102 3B Leia Harbour Julianne Huegel Will Okech Chia-Heng Wu Department of Bioengineering Background: Initial suture testing proved inconclusive due to small sample size and inaccurate testing procedures Larger sample size and the use of Instron technology will allow for investigation and comparison of the material properties of two suture techniques Hypothesis & Objectives: Based on raw data collected in past experiments, it is hypothesized that the

horizontal mattress suture technique will have a greater failure strength and higher Youngs Modulus than the vertical mattress suture technique. Department of Bioengineering Julianne Huegel Methods & Protocol: Sample size is ten successful sample failures for each suture technique. Measure and cut 20 samples of the CottonDuck canvas material with dimensions of 7.5 cm by 2.4 cm. Cut each of these in half crosswise. Create two groups of 10 wound samples and sew 4 stitches into each sample, with one population receiving horizontal mattress stitches and one population receiving vertical mattress stitches. Each stitch should be of uniform length, spacing, and distance from the edges of the sample to be determined as appropriate by the group. Insert each sample into the clamps, run Instron. Collect Stress-Strain curve data. Use a speed previously determined to be appropriate by using other materials. A speed of 60 mm/min is recommended. Use tape to minimize slippage if necessary.

Save data for further analysis. Department of Bioengineering Leia Harbour Proposed Findings: The two populations, vertical and horizontal mattress suture samples, will provide ten trials each. Each trial will produce a: 1. Stress vs. Strain Curve 2. Youngs Modulus 3. Failure Strength 4. Descriptive statistics and t-tests will be used to analyze Items 2 and 3 to investigate possible statistically significant differences between the techniques. In accordance with the hypothesis, it is expected that vertical mattress sutures will have a lower Youngs modulus and a lower failure strength based on our pilot data.

A sample Stress-Strain curve: http://nsmwww.eng.ohio-state.edu/Stamping_Glossary/assets/images/autogen/a_y3.gif Department of Bioengineering Chia-Heng Wu Potential Pitfalls: Inability of clamps to secure the sutured material in a fixed position resulting in slippage. Experimenters inability to have a constant suturing technique which could result in unequally spaced stitches. Some sutures may be tighter than others within a test sample. May experience failure in the material prior to failure of the sutures. Department of Bioengineering William Okech Equipment, Materials and Budget

Materials to be Purchased: Individual Price $15.56 Straight Roundpoint Needle (4 in. x 12) Polyester Thread (diam. $5.16 0.023 in x 206 yds w/ 21 lb. tensile strength) CottonDuck Canvas Fabric (0.04 in. thick x 36 in. wide) $2.08/ft *15 ft = $31.2 Polyethylene Tape (1/32 $20.13 in. thick x 72 yds) TOTAL PRICE (all matls $72.05 supplied by McMasterCarr) Department of Bioengineering

The Instron will be utilized to test for the desired material properties. Needles and polyester thread are necessary for suturing two pieces of canvas together. Polyethylene tape will be provided for preventing slippage. Heavyweight canvas is used in order to limit material deformation to the suture only. To ensure suture failure, polyester thread was chosen because its tensile strength is less than that of other suture materials. Group 102B3

Recently Viewed Presentations

  • Coordinate System Unit 1: Mapping the Earth

    Coordinate System Unit 1: Mapping the Earth

    Coordinate System Unit 1: Mapping the Earth This unit is comprised of two main concepts; our coordinate system based on latitude and longitude, and using topographic maps that indicate landforms and human construction. Concept 1: Our coordinate system Big Ideas:...
  • North Carolina Society of Enrolled Agents

    North Carolina Society of Enrolled Agents

    North Carolina Society of Enrolled Agents * Examination Collection Appeals Common opportunities to represent a taxpayer North Carolina Society of Enrolled Agents * Enrolled Agents have the authority to prepare any type of tax return and may represent any taxpayer...
  • ¡A ME ME TOCA! It's my turn!

    ¡A ME ME TOCA! It's my turn!

    It's my sister's turn to make the bed. We add the "a" + subject . to make sure the listener understands who we are talking about. LOS QUEHACERES. dar de comer al gato/perro. to feed the dog/cat. sacudir. los. muebles....
  • Introduction to the QPP and MIPS

    Introduction to the QPP and MIPS

    The Quality Payment Program. The Quality Payment Program policy will reform Medicare Part B payments for more than 600,000 clinicians across the country, and is a major step in improving care across the entire health care delivery system.
  • UCAS Information Evening Applying To University: Getting Ready

    UCAS Information Evening Applying To University: Getting Ready

    Most common are BMAT (Medicine), LNAT (Law) and UKCAT (Medicine), as well as Oxford tests and now Cambridge "A timed unseen written paper based or on-line test normally taken in the academic year before admission to an HEI, the results...
  • University of Derby PReSS  Belonging and Connectedness: Enhancing

    University of Derby PReSS Belonging and Connectedness: Enhancing

    Competent and positive teachers are essential for student well-being, and Bower, et al (2015) identify that "teacher well-being has a positive effect on student achievement" (p.102). Therefore staff need to facilitate opportunities for Student to Student connection and also to...
  • Female Characters in gothic texts - Quia

    Female Characters in gothic texts - Quia

    Female Characters in gothic texts. ... To look at the characteristic features of different female characters. ... With any gothic text you read: To what extent are women suppressed or marginalised within the story? The trembling victim.
  • Imaging Contribution in Arachnoid Intracranial Cyst

    Imaging Contribution in Arachnoid Intracranial Cyst

    IMAGING CONTRIBUTION IN ARACHNOID INTRACRANIAL CYST. ... However to make a difference with an epidermoid cyst, FLAIR-weighted sequences, distribution and CISS are a great contribution. CT: CSF density bone remodeling, no contrast enhancement. ... CYST NEUROGLIAL. TRAETMENT.