可降解血管支架在完成支撑使命后为何要被吸收，材料选择上有何难点？
Why should a biodegradable vascular stent be absorbed after its supporting role, and what are the material challenges?
金属永久支架长期留存可能引发慢性炎症、晚期血栓与服药依赖；可降解支架在血管修复完成后逐渐吸收，恢复血管自然舒缩。难点在于聚乳酸等材料的降解速率要与内皮愈合匹配，且在支撑期内保持足够径向强度，降解产物还需生物相容。
Permanent metal stents can provoke chronic inflammation, late thrombosis, and lifelong medication; a biodegradable stent is absorbed after the vessel heals, restoring natural compliance. The challenge is matching polymer (e.g., PLLA) degradation to endothelial healing while keeping enough radial strength during support, with biocompatible degradation products.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Ratner、Hoffman、Schoen & Lemons，《生物材料科学：医用材料导论》（第3版）
Ratner, Hoffman, Schoen & Lemons, 'Biomaterials Science: An Introduction to Materials in Medicine' (3rd ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787302141884（豆瓣书目条目: 生物材料科学医用材料导论）
#可降解支架 #聚乳酸 #血管 #生物相容
深部脑刺激（DBS）治疗帕金森症时，刺激参数如何影响疗效与副作用？
In deep brain stimulation (DBS) for Parkinson's disease, how do stimulation parameters affect efficacy and side effects?
DBS 通过植入电极向丘脑底核等靶点发送高频电脉冲，调节异常神经振荡。频率、脉宽与幅度的设定决定能否抑制震颤又避免言语、步态等副作用，需在疗效窗口与不良反应间精细权衡，并常结合个体化的靶点定位与自适应闭环刺激。
DBS sends high-frequency pulses to targets such as the subthalamic nucleus to modulate abnormal neural oscillations. Frequency, pulse width, and amplitude determine whether tremor is suppressed without speech or gait side effects, requiring fine trade-offs within a therapeutic window, often with individualized targeting and adaptive closed-loop stimulation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature Neuroscience（脑刺激与神经调控）
Nature Neuroscience (brain stimulation and neuromodulation)
#深部脑刺激 #帕金森 #神经振荡 #闭环刺激
侵入式神经接口面临的最大工程挑战通常是什么？
What is usually the biggest engineering challenge for invasive neural interfaces?
主要挑战是在柔软脑组织与刚性电极之间维持长期稳定且高保真的信号记录。异物反应会形成瘢痕包裹电极、抬高阻抗并衰减信号，因此研究转向柔性、微纳电极阵列与生物相容涂层，以延长可用寿命并提高通道数。
The main challenge is maintaining long-term stable, high-fidelity recording between soft brain tissue and rigid electrodes. The foreign-body response forms scar tissue that encapsulates electrodes, raising impedance and weakening signals, so research turns to flexible micro-nano arrays and biocompatible coatings to extend lifetime and raise channel count.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature Biotechnology（神经接口技术）
Nature Biotechnology (neural interface technology)
#神经接口 #柔性电极 #信号记录 #异物反应
心脏起搏器是怎样感知并纠正异常心率的？
How does a cardiac pacemaker sense and correct an abnormal heart rate?
起搏器通过电极持续监测心脏电活动，当检测到心率过慢或停搏时，按设定节律发放电脉冲刺激心肌收缩。现代设备还可感知运动状态自动调整频率，并以密封钛壳与长效电池保证十余年的体内稳定工作。
The pacemaker continuously monitors cardiac electrical activity via leads and, when it detects bradycardia or pauses, delivers timed electrical pulses to make the myocardium contract. Modern devices sense activity to auto-adjust rate and use a sealed titanium case and long-life battery for over a decade of stable in-body operation.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature Biomedical Engineering（植入式心脏设备）
Nature Biomedical Engineering (implantable cardiac devices)
#起搏器 #心率 #电脉冲 #植入式
评价医疗器械生物相容性通常考察哪些方面？
What aspects are typically examined when assessing the biocompatibility of a medical device?
生物相容性考察材料在生物环境中不引发毒性、过敏、血栓或过度炎症的能力，并通过细胞毒性、致敏、血液相容与植入后局部反应等系列测试评价。国际标准（如 ISO 10993）系统规定了按接触类型与时限应做的生物学评价项目。
Biocompatibility assesses a material's ability to reside in a biological environment without causing toxicity, allergy, thrombosis, or excessive inflammation, evaluated through cytotoxicity, sensitization, hemocompatibility, and local implantation-response tests. Standards such as ISO 10993 specify which biological evaluations apply by contact type and duration.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
ISO 10993（医疗器械生物学评价）
ISO 10993 (biological evaluation of medical devices)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787506669153（豆瓣书目条目: 医疗器械生物学评价）
#生物相容性 #ISO 10993 #细胞毒性 #血液相容
人工髋关节常用哪些材料组合，其磨损问题如何缓解？
What material combinations are common in artificial hip joints, and how is wear addressed?
经典组合是金属或陶瓷球头配超高分子量聚乙烯臼杯，也有陶瓷对陶瓷以降低磨损。通过提高表面光洁度、优化球头直径与交联聚乙烯，可将磨损颗粒减少到延长假体寿命的水平，但颗粒引发的骨溶解仍是长期隐患。
A classic pairing is a metal or ceramic head against an ultra-high-molecular-weight polyethylene cup, and ceramic-on-ceramic is used to cut wear. Better surface finish, optimized head diameter, and cross-linked polyethylene reduce wear particles to extend implant life, though particle-induced osteolysis remains a long-term concern.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Ratner、Hoffman、Schoen & Lemons，《生物材料科学：医用材料导论》（第3版）
Ratner, Hoffman, Schoen & Lemons, 'Biomaterials Science: An Introduction to Materials in Medicine' (3rd ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787302141884（豆瓣书目条目: 生物材料科学医用材料导论）
#人工关节 #超高分子量聚乙烯 #陶瓷 #磨损
人工耳蜗帮助重度耳聋者恢复听觉的基本原理是什么？
What is the basic principle by which a cochlear implant restores hearing for severe deafness?
人工耳蜗绕过受损的耳蜗毛细胞，用麦克风与处理器把声音编码为电信号，经植入电极直接刺激听神经不同频段。大脑由此重新学会解读这些电模式为语音，使先天或后天重度聋者获得语言感知能力。
A cochlear implant bypasses damaged hair cells, using a microphone and processor to encode sound into electrical signals delivered by implanted electrodes that stimulate different frequency bands of the auditory nerve. The brain relearns to interpret these electrical patterns as speech, giving severe-profound deaf users language perception.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Clark,《The multi-channel cochlear implant and the relief of severe-to-profound deafness》,Cochlear Implants International,2012 (DOI: 10.1179/1754762811y.0000000019)
Clark, 'The multi-channel cochlear implant and the relief of severe-to-profound deafness', Cochlear Implants International, 2012, DOI: 10.1179/1754762811y.0000000019
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1179/1754762811y.0000000019
#人工耳蜗 #听神经 #声音编码 #植入