'''3.Materials used for stent:'''Boston scientific have patents on various materials used for stent. For eg.Elastically deformable stents(polysaccharide-based hydrogels), Biodegradable polymer based stents, Porous polymer for long term implantation( poly(styrene) blocks and polyisobutylene blocks),Stent with variable hardness (ethylene vinyl acetate and hydroxypropylcellulose)
==C.R.Bard==
===Products===
* They have 6 products in their ureteral stent portfolio
* There are no clinical trials going on for research on new stent
* C.R Bard ureteral stent portfolio have some common features such as:
#Most of the stent has Silicone as their main material
#They have stent with various designs and shapes eg Figure 4 ureteral stent
#Some of the stent have coatings which is licesed from third party eg."pHreecoat"
===Regulatory data===
The time taken for C.R. Bard to get their stent approved ranged from 21 days to 9 months
===Clinical trials===
There are no trials currently conducted by C.R.Bard. The other trials are related to comparison of various ureteral stent of different companies in terms of patient comfort and materials used in the stent.*The result of trials is that there is not much difference in all the ureteral stent of different companies in terms of patient comfort and materials used in the stent
===Patents===
C.r.Bard is not active in filing patents with very few patents filed after 2000.
*The unmapped patents are analysed based on the following parameters
'''1.Coating on stent:'''They have a couple of patents related to therapeutic coatigs on stent surface
'''2.Structure of stent:'''C R. Bard patents are related to expandable stents for reducing patent discomfort
'''3.Material used on stent:''' Recent patents focuses on Biodegrable polymers, Shape memory alloys or general polymer based stent
Source [http://www.liebertonline.com/doi/abs/10.1089/end.2005.19.990?journalCode=end University of Minnesota]
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