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

From: Brock Hinzmann (
Date: Mon May 16 2005 - 20:43:38 EEST

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

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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