ST-504 mechanism guide
What should a programmed compression cycle look like?
Use repeatable equipment behavior to distinguish a cycle from a setup or fault question.
Watch sequence
Follow chamber inflation and release.
Hold conditions steady
Fit and battery affect the observation.
Stop for abnormal behavior
Do not reproduce a problem with more pressure.
A programmed cycle is a sequence of equipment actions. The controller sends air into the sleeve chambers, changes the pressure pattern, and releases air according to the selected mode. The exact order and duration come from the current instruction for use.
Look for repeatable device behavior
The display should show the selected controls. The sleeve should remain in position. The chambers should inflate and release in an order that matches the product information. The tubing should stay connected and free of sharp bends.
The mechanism guide explains the air path. The setup guide explains how to begin from a stable physical setup.
A cycle can feel different without being a new result
Fit, clothing, body position, battery state, and the selected mode can change the sensation. A stronger feeling does not prove a stronger benefit. A lighter feeling does not prove that the device failed.
Record what changed before changing a setting. If the sleeve moved or a tube kinked, correct that physical issue first.
When the cycle is not an ordinary observation
Stop for pain, increasing numbness, skin change, unusual heat, smoke, visible damage, or repeated unexplained stopping. Do not restart at a higher pressure to reproduce the event. Use the troubleshooting guide for persistent equipment faults.
The cycle describes how the product operates. It cannot diagnose a symptom or approve a personal treatment plan.
The cycle is easier to understand when the user observes one complete run instead of judging a single squeeze. Note whether the order repeats, whether the controller reaches the end, and whether the sleeve remains secure. Those details can point to normal operation, a fit problem, or a support question. Record the battery state if the result changes.
A complete cycle gives better evidence
Observe one full run when it is safe to do so. Note the first chamber, the release order, the end of the timer, and whether the sleeve stayed secure. A single squeeze is not enough to describe a programmed pattern. If the sequence changes from one run to the next, check fit, tubing, battery, and mode before drawing a conclusion.
Source boundary for cycle questions
Use the current manual for sequence and duration. General FDA medical device information provides context but does not diagnose a symptom from a cycle observation.
The useful result is a clear equipment description, not an inferred health outcome.