The Interrelationship Between Friction and Fracture in Needle Insertion

进针时摩擦与断裂的相互关系

• 批准号: 2219787
• 负责人: Shelby Hutchens
• 金额: $ 64.07万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2219787&HistoricalAwards=false
• 关键词: Interrelationship; Between; Friction; Fracture; Needle

This award will advance understanding of the fundamental mechanics of needle insertion. Despite the ubiquity of needle-based medical procedures and a wealth of needle insertion studies, there are critical gaps in understanding. Quantification of the sliding friction and material fracture during post-puncture needle insertion is needed to evaluate new needle designs and the soft materials into which they may be inserted. The current shortcomings in computational prediction stem in part from a missing description of the effect of friction and fracture on one another. A more detailed understanding is critical to the successful expansion of minimally invasive methods to areas beyond the body’s surface. Successful description of the fundamental mechanics of these effects will both facilitate control schemes and enable rapid evaluation of novel needle designs. This research is expected to ultimately result in reduced patient discomfort, healing time, and procedure costs. This research will be implemented with a team of graduate researchers who will receive management training to coordinate the effort of undergraduate trainees. The researchers will share their experiences and findings via social media with the aim of illuminating the challenges, rewards, and process of mechanics of materials research for the public.This research will quantify the simultaneous and reciprocal effects of sliding friction and material rupture during post-puncture needle insertion. Initial goals will guide the work toward first understanding the influence of fracture on surface morphology and the latter’s influence on friction. Once gained, these separate effects will be unified in the primary goal of simultaneously describing interfacial mechanics along the needle shaft and fracture at the needle tip. Tests will be performed at quasi-static to surgically-relevant rates. First, surface damage morphology will be systematically varied by controlling both the energy available to fracture (via tip radius and boundary conditions in planar and needle geometries) and material constitutive response using two well-characterized materials systems typical of needle insertion studies, but having different failure behaviors: oil-diluted silicone (tougher) and hydrogel (more brittle). Second, the effect of surface damage morphology on frictional resistance to sliding will be measured to establish correlations and critical regimes as a function of rate and normal force. Finally, using these correlations, planar cutting geometry conditions will be mapped to the cylindrical needle-insertion geometry to quantify frictional effects which will be further tuned via surface modification. This mapping will be initiated via local failure criteria obtained from full field strain measurement during in situ needle insertion and cutting. The resulting fundamental understanding of the interrelationship between friction and fracture will inform the development of more robust computational models of needle insertion and lead to more refined and improved models for robotic needle insertion. Both advances will enhance the development of minimally-invasive, tissue-specific needle designs.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项将促进对针插入的基本机制的理解。尽管基于针头的医疗程序和大量针头插入研究存在着无处不在，但理解仍存在关键差距。需要在调件后针插入过程中量化滑动摩擦和材料断裂，以评估新的针头设计和可能被插入的软材料。计算预测中当前的缺点部分源于对摩擦和断裂彼此影响的缺失描述。更详细的理解对于成功扩展到最小的侵入性方法至人体表面以外的区域至关重要。这些效果的基本机制的成功描述既可以促进控制方案，又可以快速评估新颖的针头设计。预计这项研究最终会导致患者不适，康复时间和程序成本减少。这项研究将与一组研究生研究人员一起实施，他们将接受管理培训以协调本科学员的努力。研究人员将通过社交媒体分享他们的经验和发现，以阐明公众材料研究的挑战，奖励和过程。这项研究将量化后插入后插入过程中滑动摩擦和材料破裂的最简单和相互影响。最初的目标将指导工作首先了解断裂对表面形态的影响以及后者对摩擦的影响。一旦获得，这些单独的效果将在简单地描述沿针轴和针尖处断裂的主要目标中统一。测试将以准静态到与手术相关的速率进行。首先，通过控制裂缝可用的能量（通过尖端半径和平面和针几何形状的边界条件）以及使用两个针刺插入研究的典型特征性的材料系统，但具有不同的故障行为：油化硅胶（较牢固的硅胶）和水果（Migh Brittle filter），将对表面损伤形态进行系统的变化。其次，将测量表面损伤形态对滑动摩擦抗性的影响，以建立相关性和关键状态作为速率和正常力的函数。最后，使用这些相关性，将平面切割几何条件映射到圆柱形插入几何形状以量化摩擦效应，这将通过表面修饰进一步调节。该映射将通过在原位针头插入和切割过程中从全场应变测量中获得的局部故障标准启动。对摩擦和骨折之间相互关系的基本理解将为针刺插入的更强大的计算模型提供信息，并导致更精致和改进的机器人针插入模型。这两种进步都将增强最低侵入性的，组织特定的针头设计。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，认为通过评估被认为是珍贵的支持。