You can buy replacement handles. Here's an article that explains how to remove the old one and attach a new one. I hope this helps you. Wishing you the best.
What’s the problem with it? Is it possible to post a photograph?
Can you call customer service for the brand of your chair, or look on their website for a manual and replacement parts.
The company has been out of business for a long time, but I can check their website. Thank you