The ornamental design for an incontinencetreatmentdevice, as shown and described.
1. Incontinence treatment device
1.1: Perspective
1.2: Front
1.3: Back
1.4: Left
1.5: Right
1.6: Top
1.7: Bottom
It is to be seated by an user so that the perineal region of the user should be positioned on the electric stimulation part formed on the center of the device.