Walking aids for elderly carrying portable oxygen concentrator

Are there any safe walking aids my 84 yr-old hubby could use while carrying-around his POC? He needs some type of support due to becoming less stable walking from room-to-room. Says he's afraid he'll trip on a cane or using a rollator. Has pulmonary fibrosis and severe kyphosis. Has lost a lot of muscle. Not strong anymore. Can barely get up from his recliner or any chair.