UPEASY Lifting Cushion by UP Lift technologies.  The UPEASY Lifting Cushion helps people who would otherwise need assistance getting up or sitting gently. Easy to use, durable, comfortable, adjustable and portable, the UPEASY lifts up to 80% of the user's weight as needed. No batteries-a hydro-pneumatic gas spring releases slowly as the user begins to stand.  Two Sizes:  90-220lb or 200-340LB.

There is also an electric UPEASY cushion available.