Brandon Harold J, Nichter Larry S, Back Dwight D
Department of Mechanical Engineering and Materials Science, Washington University, St. Louis, MO 63130, USA.
Pacific Center for Plastic Surgery, Newport Beach, CA 92660, USA.
Bioengineering (Basel). 2019 May 12;6(2):43. doi: 10.3390/bioengineering6020043.
The IDEAL IMPLANT Structured Breast Implant is a dual lumen saline-filled implant with capsular contracture and deflation/rupture rates much lower than single-lumen silicone gel-filled implants. To better understand the implant's mechanical properties and to provide a potential explanation for these eight-year clinical results, a novel approach to compressive load testing was employed. Multi-dimensional strains and tangent moduli, metrics describing the shape stability of the total implant, were derived from the experimental load and platen spacing data. The IDEAL IMPLANT was found to have projection, diametric, and areal strains that were generally less than silicone gel implants, and tangent moduli that were generally greater than silicone gel implants. Despite having a relatively inviscid saline fill, the IDEAL IMPLANT was found to be more shape stable compared to gel implants, which implies potentially less interaction with the capsule wall when the implant is subjected to compressive loads. Under compressive loads, the shape stability of a higher cross-link density, cohesive gel implant was unexpectedly found to be similar to or the same as a gel implant. In localized diametric compression testing, the IDEAL IMPLANT was found to have a palpability similar to a gel implant, but softer than a cohesive gel implant.
理想植入体结构化乳房植入物是一种双腔盐水填充植入物，其包膜挛缩和放气/破裂率远低于单腔硅胶填充植入物。为了更好地了解该植入物的机械性能，并为这些八年的临床结果提供一个可能的解释，采用了一种新的压缩载荷测试方法。从实验载荷和压板间距数据中得出了多维应变和切线模量，这些指标描述了整个植入物的形状稳定性。结果发现，理想植入体的突出、直径和面积应变通常小于硅胶植入物，切线模量通常大于硅胶植入物。尽管理想植入体填充的是相对无粘性的盐水，但与凝胶植入物相比，它的形状稳定性更高，这意味着当植入物受到压缩载荷时，与囊壁的相互作用可能更小。在压缩载荷下，意外地发现交联密度更高、粘性更强的凝胶植入物的形状稳定性与凝胶植入物相似或相同。在局部直径压缩测试中，发现理想植入体的可触知性与凝胶植入物相似，但比粘性凝胶植入物更软。
