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degradability of polymers for implantable biomedical devices降解性的聚合物植入式生物医学设备
Int. J. Mol. Sci. 2009, 10, 4033-4065; doi:10.3390/ijm OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 /journal/ijms Review Degradability of Polymers for Implantable Biomedical Devices SuPing Lyu * and Darrel Untereker Medtronic Corporate Science and Technology / 710 Medtronic Parkway, Minneapolis, MN 55432, USA; E-Mail: darrel.untereker@ (D.U.) * Author to whom correspondence should be addressed; E-Mail: suping.lyu@ (S.L.); Tel. +1-763-505-4549; Fax: +1-763-505-4712. Received: 5 August 2009; in revised form: 4 September 2009 / Accepted: 7 September 2009 / Published: 11 September 2009 Abstract: Many key components of implantable medical devices are made from polymeric materials. The functions of these materials include structural support, electrical insulation, protection of other materials from the environment of the body, and biocompatibility, as well as other things such as delivery of a therapeutic drug. In such roles, the stability and integrity of the polymer, over what can be a very long period of time, is very important. For most of these functions, stability over time is desired, but in other cases, the opposite– the degradation and disappearance of the polymer over time is required. In either case, it is important to understand both the chemistry that can lead to the degradation of polymers as well as the kinetics that controls these reactions. Hydrolysis and oxidation are
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