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Effect of Infill on Resulting Mechanical Properties of Additive Manufactured Bioresorbable Polymers for Medical Devices

27 Pages Posted: 21 Feb 2020 First Look: Accepted

See all articles by Clayton J. Culbreath

Clayton J. Culbreath

Poly-Med, Inc.

Brian Gaerke

Poly-Med, Inc.

M. Scott Taylor

Poly-Med, Inc.

Seth D. McCullen

Poly-Med, Inc.

O. Thompson Mefford

Clemson University - Department of Materials Science and Engineering

Abstract

The crossover between additive manufacturing (AM) and bioresorbable materials play a critical role in development of a new bioresorbable medical devices. When combined with the innovation and technological advances of additive manufacturing, the use of bioresorbable polymers could prove tremendous to the development of custom bioresorbable implants. However, a key question for the use of thermoplastic based resorbable polymers lies in the potential changes in properties experienced during manufacturing, and thus the effect of process parameters on the performance of the final device is of critical importance. Specific resorbable materials are selected for mechanical and resorption rate properties based on bulk measurements. The implanted mechanical properties of a device are significantly affected by processing parameters and are the leading concern of clinicians during development and patient use of a new device. In this work, additive manufacturing of medical grade polymers and copolymers of L-lactide, ε-caprolactone were extruded into filaments of 1.75 mm in diameter and printed at different infill percentages. The molecular, thermal, and mechanical properties of homopolymers of L-lactide and ε-caprolactone, along with a unique copolymer of L-lactide, ε-caprolactone, and trimethylene carbonate, Lactoflex® 7415 were evaluated. Through variance of material composition and the infill parameter of AM, an order of magnitude range in tensile strength and modulus properties were observed as feasible and optimizable.

Keywords: bioresorbable polymer, additive manufacturing, mechanical properties, infill, polylactide, polycaprolactone

Suggested Citation

Culbreath, Clayton J. and Gaerke, Brian and Taylor, M. Scott and McCullen, Seth D. and Mefford, O. Thompson, Effect of Infill on Resulting Mechanical Properties of Additive Manufactured Bioresorbable Polymers for Medical Devices. Available at SSRN: https://ssrn.com/abstract=3539231 or http://dx.doi.org/10.2139/ssrn.3539231

Clayton J. Culbreath (Contact Author)

Poly-Med, Inc.

Anderson, SC 29625
United States

Brian Gaerke

Poly-Med, Inc.

Anderson, SC 29625
United States

M. Scott Taylor

Poly-Med, Inc.

Anderson, SC 29625
United States

Seth D. McCullen

Poly-Med, Inc.

Anderson, SC 29625
United States

O. Thompson Mefford

Clemson University - Department of Materials Science and Engineering ( email )

Clemson, SC 29634
United States

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