Hi all!I am a final year Product Design student and have spent the last five months researching phlebotomy . For my thesis project I am designing a tool to reduce accidental needle stick injuries, patient related needle anxiety and human error. My dad has blood samples taken very regularly and, accompanying him often, I have noticed a possible gap for a product like this. The design will aid in locating the vein first externally, and then internally.I have a few questions which I'd love to get some feedback on!:wink2:1. Can anyone explain the requirement to "blanch" the vein before venipuncture?2. Is the angle of insertion range (between 15-30 degrees) dependant on the patient, or will any angle in the range generally work well?3. Is the arterial pulse evident from sight or is it neccessary to feel it?4. Is it a regular occurance that venipuncture occurs at a valve by accident?Any other points, ideas, thoughts etc. would be soooooooo appreciated! You are my target users so your opinions are what the design must be guided by! Thank you nurses!!!