Hello, this is Jim, thanks for the question.
Sorry to hear of the injury. I am not sure if you sought medical attention but if you are still having pain / symptoms then you should see your GP or the local hospital. In terms of a claim, you can sue for negligence and product liability against the seller - you would need a law firm for this to claim an award under the Personal Injuries Assessment Board (PIAB) guidelines. In Ireland the level of damages are very generous compared to say, the UK.
If you instruct a law firm then they will take your details and send the seller a letter of claim to outline the allegations of negligence and they will probably arrange for you to see a medical expert (not your treating doctor - someone independent) to do a report to detail the injury, the diagnosis and prognosis (how long you may have symptoms for).
I would not recommend you sue the company yourself - they will be aware you are without legal representation so they will only offer a small sum of money, probably less than 1,000 euro. You should not consider any offers they might make to you now without consulting a lawyer - you only get one chance to claim, so don't settle without a medical report to know exactly how serious the injury is. The level of damages for minor hand injuries goes up to 21,700 euro, depending on your recovery, etc.
How much you end up with depends on the injury, any scarring, any permanent symptoms, any impact on your dexterity, etc.
The question now is which firm to instruct - there are several around, you can find one local to you which deals in personal injury law here : https://www.lawsociety.ie/Find-a-Solicitor/Solicitor-Firm-Search/
I hope this helps, please feel free to ask any follow up questions. I wish you a speedy recovery with your injuries.