Description
| CODE | DESCRIPTION |
| KNJ627 | Swan100 Hydraulic Polycentric 5-Bar Safety Knee 125kg |
| Activity Level | 2～3 |
| Body Weight Limit | 125kg |
| Weight | 935g |
| Overall Length | 198 mm |
| Overall Width | 76 mm |
| Material | Aluminum Alloy and Stainless Steel |
| Swing Phase Control Mechanism | Hydraulic Cylinder |
| Stance Phase Control Mechanism | Bouncing Mechanism |
| Maximum Bend Angle | 150′ |
Usability
Even though the users may not realize it, this product has a five-link structure with a dynamic stabilization mechanism (preventing knee bending through link geometry) and bouncing bumper that allow for safe, comfortable, worry-free walking and an attractive gait.
Preventing Knee Bending During the First Half of the Stance Phase (the Dynamic Stabilization Mechanism)
When the Swan applies weight to the heel during full extension, the Swan’s links use bouncing bumpers to absorb the impact by displacement (slight bending). When that happens, the front and back vertical links become nearly parallel, momentarily transferring the knee joint’s center of rotation toward the hip joint and preventing knee bending during the first half of the stance phase.
During the mid-phase, the displacement of the Swan links is gradually reversed, restoring the four main links and allowing the knee to bend.
The Bouncing Mechanism
Because the Swan links undergo elastic displacement (slight bending of 4° or less) during the first half of the stance phase, vertical repositioning of the center of gravity is reduced, while at the same time, the body absorbs stance-phase impact from the floor, allowing it to advance forward smoothly. As a result, walking consumes less energy, and enabling a smooth gait (with double knee action) that is very close to a normal walk.
The duration, sensitivity, and volume of the bounce can be adjusted to suit the user’s body weight and activity level by adjusting the inclination of the Swan and the amount of compression by the bouncing bumper.
The Hydraulic Cylinder
Light Hydraulic Resistance
The hydraulic cylinder part Hydraulic knees are considered to have a heavier swing than pneumatic knees, but Swan has been designed with a low amount of hydraulic resistance to provide a more comfortable walk for low and medium-activity users.
By reducing the amount of flexion resistance in the pre-swing, we were able to get that light-swing feeling that pneumatic models have. At the same time, Swan offers progressively increasing resistance in response to walking speed during first half of the swing phase (the acceleration phase) for smooth knee motion.
Pace Matching
The small, easy-to-control hydraulic cylinder can adapt to a walking cadence of up to 105 steps per minute thanks to its fluid characteristics. It adapts to a wide range of speeds, from a “gentle stroll” which requires light resistance, to a “speed walk” which requires strong resistance.
