Re: [rp-ml] Biodegradable polymers in RP?

From: Brock Hinzmann (
Date: Tue May 17 2005 - 00:14:32 EEST

I meant HA, not HP. sorry.


On Mon, 16 May 2005 10:43:38 -0700
  "Brock Hinzmann" <> wrote:
>Jim, Tim,
>Biocompatible materials, like HP, aren't necessarily
>biodegradable and vice versa. Do the HP materials you
>mention actually break down after a time? The advantage
>would be to avoid a second surgery to remove screws,
>clamps, and so forth from healing broken bones. Other
>medical applications could be as temporary support
>structures for artificial organs to grow on. Another
>would be to put something into the natural environment
>that would break down and disappear after its useful life
>is over.
>Brock Hinzmann
>On Mon, 16 May 2005 09:47:53 -0500
> "Good, Jim" <> wrote:
>>Hey Tim!
>>I know that Joe Cesarano, from the Sandia Labs in
>>Albuquerque, has worked
>>with HA in making lattice-type structures for medical
>>purposes. He
>>developed the robocasting procedure which is an additive
>>process using a
>>ceramic slurry or other slurries using powder materials.
>>He has some
>>impressive parts made from different types of ceramics as
>>well as some
>>ceramic/metal composites.
>>Here is an excerpt from an article
>>Robotic Deposition of Hydroxyapatite Structures with
>>Controlled Porosity for
>>the Improvement of Porous Bone Grafts
>>"Hydroxyapatite, the main mineral constituent of bone,
>>has been used
>>successfully as a bone substitute material. Porous forms
>>of hydroxyapatite
>>(HA) have shown excellent stability in vivo if pores are
>>of an appropriate
>>size for bone cell ingrowth and vascularization.
>>The versatility of robocasting, a freeform fabrication
>>technique that
>>robotically deposits ceramic suspensions, allows the
>>fabrication of HA
>>structures with highly controlled novel internal
>>architectures. Structures
>>with controlled pores on the size range of 100mm to
>>1000mm have been
>>produced with two different types of internal
>>architecture. In contrast,
>>traditional methods of creating pores in HA offer limited
>>control of the
>>pore architecture. The most common methods of porous HA
>>are produced from
>>polymer spheres mixed with the HA powder or by the
>>conversion of coral to
>>Jim Good
>>Muniz Engineering
>>In Situ Fabrication and Repair (ISFR)
>>-----Original Message-----
>>From: Timothy J Gornet []
>>Sent: Sunday, May 15, 2005 4:41 PM
>>Subject: Re: [rp-ml] Biodegradable polymers in RP?
>>There has also been work done with HA (hydroxyapetate
>>sp?) in the past in
>>the SLS process.
>>Tim Gornet Manager, RP Operations
>>Rapid Prototyping Center
>> Vogt Bldg. Rm 101, University of Louisville,
>>Louisville, KY 40292
>>Phone: (502)852-0714 FAX: (502)852-8890
>>>>>"Stacey Russell" <> 05/14/05 11:41
>>>>>AM >>>
>>Does anyone use biodegradable polymers in any RP process?
>>I think they are using polycaprolactone (PCL) in Asia at
>>the National Technological U. Is anyone in the U.S. doing
>>anything comparable?
>>Stacey Russell
>>Biomedical Engineering & Biotechnology
>>University of Massachusetts Lowell
>>One University Avenue
>>Lowell, MA 01854
>>phone: 978-458-0759
>>fax: 978-452-5711
>>cell: 508-843-0116

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