A kit for treating spinal stenosis is disclosed, the kit comprising:a cannula having a distal portion configured to be inserted along a generally anterior trajectory across interlaminar space between lamina of adjacent vertebra to a first location external to an epidural space；a tissue excision device having a distal portion configured to be inserted through the cannula to a second location external to the epidural space；wherein the distal portion of the tissue excision device is visualized at the second location using imaging means；wherein the tissue excision device is configured to excise and remove tissue about the second location, which decompresses the spinal stenosis.
