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Evaluation of Local Tissue Reaction After the Application of a 3D Printed Novel Holdfast Device for Left Atrial Appendage Exclusion
Annals of Biomedical Engineering ( IF 3.0 ) Pub Date : 2019-07-15 , DOI: 10.1007/s10439-019-02320-2
Maciej Brzeziński , Aleksandra Sejda , Rafał Pęksa , Maciej Pawlak , Kamil Bury , Zbigniew Adamiak , Maciej Kowalik , Dariusz Jagielak , Krzysztof Bartus , Mateusz K. Hołda , Radoslaw Litwinowicz , Jan Rogowski

Abstract

The left atrial appendage (LAA) is a small, finger-like extension of the left atrium and its exclusion is used as a treatment strategy to prevent ischemic stroke. Existing holdfast devices may damage the tissue, are unisized and not adjustable. A novel holdfast device for LAA exclusion devoid of these shortcomings was designed and 3D-printed using the Selective Laser Sintering (SLS) technology with polyamide powder and tested it on animal model. We selected the SLS 3D printing technology due to its wid14e availability and low production costs which could provide on-site 3D printing for specific patient. The purpose of this study was to evaluate the biocompatibility of the reported holdfast device and compare the histological results obtained for local tissue reactions to those obtained for an established grafting material. Thirty swine subdivided into two groups were examined. The LAA exclusion device was implanted and was either coated with a polyester vascular implant or not coated at all and the histological response to the device’s presence was evaluated which is a standard approach to test the device biocompatibility. In all cases, complete occlusion was seen without any pathological findings during the incubation time. In both groups, the surface of the atrium under a holdfast device was smooth and shiny and had no clots. The foreign body reaction of the LAA holdfast device made of polyamide powder was insignificantly lower compared to the polyester graft. Thus, it fulfils the parameters of biocompatibility at the highest degree, and makes it suitable material for the manufacturing of LAA holdfast devices.



中文翻译:

应用3D打印的新型Holdfast装置进行左心耳阑尾排斥反应后的局部组织反应评估

摘要

左心耳(LAA)是左心房的一个小的手指状延伸,将其排除在外可作为预防缺血性中风的治疗策略。现有的固定装置可能会损坏组织,并且尺寸固定且无法调节。设计了一种新颖的用于保持LAA排除力的装置,该装置没有这些缺点,并使用选择性激光烧结(SLS)技术和聚酰胺粉末进行了3D打印,并在动物模型上进行了测试。我们选择SLS 3D打印技术是因为它具有wid14e的可用性和较低的生产成本,可以为特定患者提供现场3D打印。这项研究的目的是评估所报道的固定装置的生物相容性,并将局部组织反应所获得的组织学结果与已建立的移植材料所获得的组织学结果进行比较。检查了分为两组的三十只猪。植入LAA排斥装置,并用聚酯血管植入物涂覆或完全不涂覆,并评估对该装置存在的组织学反应,这是测试装置生物相容性的标准方法。在所有情况下,在孵育期间均观察到完全闭塞,而无任何病理发现。在两组中,在保持装置下的心房表面均光滑,有光泽且无凝块。与聚酯接枝相比,聚酰胺粉末制成的LAA固定装置的异物反应明显降低。因此,它在最高程度上满足了生物相容性参数,并使其成为制造LAA固定装置的合适材料。植入LAA排斥装置,并用聚酯血管植入物涂覆或完全不涂覆,并评估对该装置存在的组织学反应,这是测试装置生物相容性的标准方法。在所有情况下,在孵育期间均观察到完全闭塞,而无任何病理发现。在两组中,在保持装置下的心房表面均光滑,有光泽且无凝块。与聚酯接枝相比,由聚酰胺粉末制成的LAA固定装置的异物反应显着降低。因此,它在最高程度上满足了生物相容性参数,并使其成为制造LAA固定装置的合适材料。植入LAA排斥装置,并用聚酯血管植入物涂覆或完全不涂覆,并评估对该装置存在的组织学反应,这是测试装置生物相容性的标准方法。在所有情况下,在孵育期间均观察到完全闭塞,而无任何病理发现。在两组中,在保持装置下的心房表面均光滑,有光泽且无凝块。与聚酯接枝相比,聚酰胺粉末制成的LAA固定装置的异物反应明显降低。因此,它在最高程度上满足了生物相容性参数,并使其成为制造LAA固定装置的合适材料。

更新日期:2020-01-04
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