Constant current needle annealing

Details Constant current needle annealing Constant current needle annealing

1998-02-13

1999-10-19

Paschall, Mark

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219506, 219494, 219 68, 432 13, 266249, H05B 102

Patent

active

059683945

ABSTRACT:
A constant current annealing device for annealing a wire or surgical needle is disclosed. The device includes amplitude and time setting devices, such as thumb-wheel switches. A constant current source is connected to the current setting device. The constant current source is switchable, through a switch for example, in response to a timing signal to provide a constant current for a predetermined duration. A pair of spaced apart electrodes are clamped on the needle and a switching device is connected between the constant current source and the pair of electrodes. The voltage drop across the switching device varies to compensate for load variations, thus keeping the anneal current constant in the anneal ON mode. In the anneal OFF mode, where current is not provided to the needle, the switching device shunts a residual current away from the electrodes. The time setting device include a programmable logic controller (PLC) and a solid state relay to provide an accurate timing signal. A current measuring and monitoring device is connected to another PLC, which shuts down the annealing device after a predetermine number of alarms or after the constant current amplitude deviates by a predetermined amount.

REFERENCES:
patent: 2957123 (1960-10-01), Rose
patent: 3746582 (1973-07-01), Gentry
patent: 3842239 (1974-10-01), Ellinghausen et al.
patent: 3962898 (1976-06-01), Tillmann
patent: 4063065 (1977-12-01), Wiist
patent: 4115685 (1978-09-01), Grandin et al.
patent: 4149477 (1979-04-01), Corvbo et al.
patent: 4295033 (1981-10-01), Lindgren et al.
patent: 4409042 (1983-10-01), Dornberger et al.
patent: 5304534 (1994-04-01), Ciszek
patent: 5477604 (1995-12-01), Smith et al.

Affiliated with

Also associated with

Rating

Constant current needle annealing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Constant current needle annealing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constant current needle annealing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2051537