Vaporisation from the needle on initial entryof the syringe into the injector, before the syringe plunger is depressed, can result in partial loss of high boiling components.
Both insulin monitors and delivery devices, called insulin pumps, are available, but so far, creating an automatic injector that does not require monitoring has proved to be a difficult problem.
We use this device called a needle injector that actually punches these sharp brads into the upper and lower jaw, kind of keep it in place so they'll stay that way.