| CPC A61B 17/22 (2013.01) [A61M 25/0068 (2013.01); A61M 25/0138 (2013.01); A61B 2017/00022 (2013.01); A61B 2017/00106 (2013.01); A61B 2017/003 (2013.01); A61B 2017/00309 (2013.01); A61B 2017/22094 (2013.01); A61B 2017/3413 (2013.01); A61B 2034/2063 (2016.02)] | 15 Claims |

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1. A method comprising:
advancing a medical device through a vessel, wherein the medical device includes a steering member, a penetrating tip, a core, and a sensing assembly coupled to the core;
sensing tissue properties adjacent to the sensing assembly within the vessel;
estimating a position of the medical device within the vessel based on the tissue properties; and
steering the medical device with the steering member based on the estimated position;
wherein the tissue properties include different types of collagen.
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