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Help modeling a stent

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Help modeling a stent

Hi Folks, im trying to draw a model for a sinusoidal stent on creo to later be used in ANSYS as a part of my final year project in college,(Stent FEA) ive started by drawing the sine wave using an equation in creo, then mirrored this pattern to create a flat wall, im looking now to make the pattern into a cylinder shape before selecting my geometry for the analysis. but im having serious trouble getting the stent to wrap, ive tried a toridal bend but no joy! any one have any ideas or can help? ive attached some files below.

im also looking to have a different material in the core of the stent, but ill take it one step at a time!

 

Thanks!

 

 EDIT** ive added a second folder (two materials) with a sine wave with two materials, but i cant now get it to pattern into the amount of lines i want.

 

 

Mosey

Mechanical / Biomedical Engineering student

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12 REPLIES 12
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Re: Help modeling a stent

Hard to open when it is created with the Educational Version of Creo.

 

Do you have any screen shots of what you are trying to accomplish?

 

 

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Re: Help modeling a stent

Hey thanks for your response, something along those lines!

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Re: Help modeling a stent

Are you looking for something like this?

stent_curve.jpg


Creo is an endless adventure: Always more to learn.
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Re: Help modeling a stent

Yea - that helps...

 

and YES - Creo is an endless adventure... but in a good way!

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Re: Help modeling a stent

Hmm... What about something like this - using your same formulation for the structure...  but then used offset coordinate system with a pattern (Z-elevation and rotation) to add in the other structures...  Then just a simple pattern reference of the curve to the CSYS pattern and then the swept geometry as another pattern reference (could be grouped I supposed).

 

2020-03-02 at 5.46 PM.png

 

You could then use a Toroidal Blend (you would have to play with the usage of that based on your goals) to position the final geometry in the orientation you want for analysis.

 

2020-03-02 at 5.51 PM.png

2020-03-02 at 5.52 PM.png

 

Another thought -- would be to use a "warp" feature - but I don't think it is as controllable... but it opens up some different ways to orient your geometry.

 

2020-03-02 at 5.56 PM.png

 

Dave

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Re: Help modeling a stent

thats amazing dude thank you so much!

the only thing im not following is the rotation, i have each 'ring' drawn on an offset co-ord system, but how do i rotate them to link up like you have sown?

 

Capture.PNG

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Re: Help modeling a stent

I believe the coordinate system is patterned by offset in the Z direction and rotated around Z by 22.5°


Creo is an endless adventure: Always more to learn.
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Re: Help modeling a stent

Yep - z-rotion and translation in the pattern.... I think I used a pattern table to accomplish that... by a simple rotation off axis then back to 0 for the angle.   Put in the right offsets and formulas to get the spacing right for your geometry and you got it.

 

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Re: Help modeling a stent

@moseybyrne

 

I think toroidal bend will help but in this case it might be failing due to multiple mirrors, try creating waves using curves instead of mirror. I hope that should help. 

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Re: Help modeling a stent

I thought so too, but I tried the toroidal bend with just the original part with no mirrors and still didn't work! Thanks tho!
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Re: Help modeling a stent

I created the attached model using sweep in Creo2. Is this similar to what you wanted to model?

 

 

stent.jpg

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Re: Help modeling a stent

Hi Mosey,

What type of stent you exactly want to model. I mean Laser cut or braided stent. Braided stent has lot of complexities as compared to the lase cut. I have made braided stent using creo 4.0

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