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Microcap & Penny Stocks : AMERICAN BIOMED, Minimally Invasive Technology (ABMI) -- Ignore unavailable to you. Want to Upgrade?

To: Jeffrey L. Henken who wrote (180)	3/16/1998 4:12:00 PM
From: Dave Dalry	Read Replies (2) \| Respond to of 2887

Wow, what happened near the close...?

To: Jeffrey L. Henken who wrote (180)	3/16/1998 6:24:00 PM
From: Aishwarya	Read Replies (1) \| Respond to of 2887

YOU BET JEFF...Here is some Information on the NITINOL ALLOY Compound. I know some must be thinking that JNJ uses steel and others use plastic for stents. Then why do ABMI products use a Nickel-Titanium alloy which is rigid. No i am wrong in the previous line and this alloy is incredibly ELASTIC!!!! Nitinol is an alloy of nickel and titanium combined in about a 1:1 ratio. It bends quite easily at room temperature. When heated above a certain transition temperature, however, it becomes hard and assumes a previously set shape. Below the transition temperature the preferred Marstensite arrangement of atoms is a slightly deformed face centered cubic structure with a unit cell angle of 96ø. Above the transition temperature the preferred Austinite arrangement is a face centered cubic structure with unit cell angles of 90ø. The "memory" property of this alloy can be explained by the phase transition from the bendable Marstensite phase to the more rigid higher temperature Austinite phase. As the wire passes through its transition temperature, the atoms rearrange into its more stable phase, either the Marstensite or the Austinite crystalline structure. In a perfect NiTi crystal movement back and forth between the two crystalline shapes would be quite random and the "memory" property would not be possible. The small imperfections and different orientations of small crystalline clusters, however, remove many of the possible ways for the atoms easily to slip over one another. When heated into the more rigid Austinite phase, it takes less energy for the atoms to slip back into their original "set" positions, thus giving the wire a "memory." To set the wire into a new shape, the Nitinol wire must be raised to a temperature of about 500øC. With this added amount of energy the atoms can rearrange into groups of crystals with new orientations and imperfections. Superelastic material known under the tradename Tinelr, Memry Corp) is a shape memory titanium-nickel alloy. Tinel can be deformed as much as 6% and will return to its original shape when the applied force is removed (for stainless steels, yield may initiate at strain levels as low as 0.02%). Long, slender, superelastic rods can withstand an outrageous amount of bending; Some test structures have been exposed to more than 90 degrees of angulation and still return to their original shape! The use of superelastic materials for linear displacement sensors Using shape memory alloys allows for extreme miniaturization of which use cores as small as .020" (500 microns). The tiny superelastic cores can withstand severe out of plane bending moments without sustaining damage (to the core or the sensor housing/coils). This makes them very rugged and free-sliding; even when subjected to extreme bending loads in handling, mounting etc. Hope you guys enjoyed reading about the compound our co. is deploying in their products. I am also making some comparisons between different categories of stents available currently in the market and i hope to put that on the thread some time soon. Regards, Sri.