Recent content by Luci

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    How to Calculate Bias Spring and Heating Current for SMA Spring Actuator?

    Do you have any information's about how to calculate the bias spring or the Force needed ? the current necessary to heat the SMA spring for a 4mm stroke ? Thank you
  2. L

    Challenge Math Challenge - June 2019

    I WILL JUST PUT SOME LABELS ON EACH MEASURED BALL :)
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    Challenge Math Challenge - June 2019

    Answer no 7 We remove 99 balls from each vessel. So it will remain only one ball in each vessel. we take the 5 balls from each vessels and weight them, one single measure, and interpret: If the result is 50 grams , it means we have 5 vessels with 10g balls and 0 vessels with 11 g balls If the...
  4. L

    How Can Electrical Impulses Trigger Needle Movement in Medical Devices?

    Needle insertion mechanism is mandatory. I fire the needle using a spring, the drug flows for 3 minutes and then I have to retract the needle. But without using a motor, witch is too expensive.
  5. L

    How Can Electrical Impulses Trigger Needle Movement in Medical Devices?

    Motor is too expensive for my application.
  6. L

    How Can Electrical Impulses Trigger Needle Movement in Medical Devices?

    Yes, nice proposal. But I don't understand how the solenoid is acting. I need to trigger the needle retraction, at the end of injection, not immediately after the insertion.
  7. L

    How Can Electrical Impulses Trigger Needle Movement in Medical Devices?

    Hello , I have an medical device assembly, where I trigger the needle for injection, mechanically, with a pretensioned spring. Injection takes 3 minutes, then I have to retract the needle. How can I trigger the needle, using an electrical impulse ?