total motion

...Anterior Cervical Disc Prosthesis PROCORAL™ MOTION PRESERVATION Artificial disc replacement (ADR) surgery—also known as a total disc arthroplasty or total disc replacement (TDR)—is typically performed for a patient with a cervical disc herniation that is causing significant neck pain and/or arm pain that has not responded to nonsurgical treatment options and is significantly affecting the...

... rod with piston assembled on it. Internal pressure, created by compressed nitrogen acts as a force in extension direction when the rod is pushed inside the tube. The charged amount of nitrogen depends on required extension force and application requirements. Gas springs are usually installed with piston rod pointing downwards to maximize damping effect and lubrication of inside parts. When designing gas springs the vital information required are: travel (stroke) length, installation (total) length, weight assisted/counterbalanced (force), and mounting place (end fittings).

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