Instant needle syringe destroyer by Pierre Tanguy, Courbevoie, France.

This needle destroyer uses a metal plate that float on a spring and moves when a needle is inserted into the opening thus destroying the needle into dust by using high temperature heat.
Address : http://www.google.com/patents?id=vPYmAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=true
Method and apparatus for destroying a medical instrument by Robert M. Walker, California.

This invention also uses two electrode and destroy the needle by using heat. During operation of the apparatus, the instrument is progressively advanced longitudinally relative to the electrodes to progressively consumes the shaft of the needle as the burning tip continuously advances from the start position to the finish position.
Address : http://www.google.com/patents?id=etkJAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false
Needle destruction device by Lawrence E. Guerra, Shawnce , KS (US).

This device has a housing with a first electrode and 2nd electrode positioned therein in such a way as to create an annular space between the electrodes. When needle is inserted, the two electrode is short circuit and thus will destroy the needle by heat.
Address : http://www.google.com/patents?id=liMOAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false
Nice Research, and also I would like to add one more Amkay Products needle and syringe destroyer with Buzzer while burning the needles which indicates total burning of needle and cut the disposable syringe nozzle easily.
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