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| Solenoids in Medical Laser Shutters |
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The challenge of this application is to block the laser beam from a fiber optic cable in a medical Neodymium-YAG laser unit where the pulse length is to be adjustable from 0.1 to 15 seconds and the system must provide inherent safety to protect both the user and the patient.
A filter glass which reflects the laser beam stops power generation when moved out of the laser beam for the pulse length required. The glass is adapted to the armature place of a size 2 rotary solenoid.
Being operated at a power input of 28 watts (25% duty cycle), the unit is fast enough to realize a minimum pulse duration of about 0.1 seconds. The hold-in power then is restricted to 7 watts (100% duty cycle) in order to avoid thermal problems.
The safety system consists of both a software watchdog system that controls the functions of the microprocessor 100 times per second and redundant 2E rotary solenoid operating synchronously with the first one. Should one solenoid fail, neither the operator nor the patient can be endangered by unintentionally applied laser power.
This inherent safety system using two identical shutter solenoids is a further development of the special standby system for laser applications.
These compact mobile units are in use worldwide for surgical, micro-surgical, endoscopic and interventional medical applications.
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