Adjustable absorber designs for implantable device

An implantable system for manipulating energy transferred by members defining a joint, comprising:

• a first attachment structure configured to be attached to a first member of the joint;
• a second attachment structure configured to be attached to a second member of the joint;
• and
• an adjustable energy absorbing device attached to the first attachment structure and second attachment structure, the adjustable energy absorbing device includes an energy absorbing component configured about a shaft and a spacer assembly configured to be translated along the shaft to alter functioning of the energy absorbing component,
• wherein the spacer assembly includes a nut and a transversely configured pin, the nut including a keyed recess for lockingly engaging with the pin.

An implantable system for manipulating energy transferred by members defining a knee joint, the members defining a natural path of motion, comprising:

• a first attachment structure configured to be attached to a first member of the knee joint;
• a second attachment structure configured to be attached to a second member of the knee joint;
• and
• an adjustable energy manipulation device attached to the first attachment structure and second attachment structure, the adjustable energy manipulation device includes an arbor being slidingly engaged with a piston, an assembly disposed over a shaft of the arbor or piston being configured to lock onto one of a plurality of positions along a length of the shaft, and a compression spring disposed over the shaft between the assembly and a base of the piston;
• wherein the assembly can be repositioned and locked on the arbor shaft to adjust the amount of load the energy manipulation device can manipulate by changing the compression of the spring.