You don't say what type of care home you work in? Residental or Nursing based
If nursing home, then any injection or medication should only be dealt with by the elected duty nurse.
In a residental setting, where the home is based around the provision of personal care and not nursing care from employed staff...
In general, for a service user who is unable to proform the necessary procedure to carry out there injection..
If the injections is either syringe based, or the service user is unable to to inject with a insulin pen, it is the norm for to arrange for a district nurse to come and carry out the injection..
If the service user is using a insulin pen and is able to inject themselves (and be aware of the dose required) but can not draw up or change the needle, then dailing up the correct dose and changing the needle can be done, in general under these circumstances the service user would have disposable insulin pens to avoid the need of changing cartidges.. Bu the service user carries out the injecting side of the procedure...
It is possible for non quailified nursing staff to be trained to carry out insulin injections, but most companies and employees themselves very rarerly take this option due the complications of liabilites leading to either an individual, employer or both being sued if something went wrong...
when I worked in the elderly care field my employeer asked on several occassion if I would carry out the necessary training to implement a ability to inject insulin dependant, but even though I've been diabetic for many years and injected myself, I declined the offer due to the complexities of how would be liable if something went wrong...