Section 385 of 440
Complete canonical tutorial. This reader section contains the same teaching body as PWR-203 · Prosthetic control. Open the Power dossier.
PWR-203 · SUPERVISED full tutorial
Control one prosthetic action through checked fit, calibrated signals and a safe default
The rehabilitation team configures a myoelectric hand for one empty-foam-cup transfer, with rest windows, fit checks and a safe open or powered-down default. The learner controls the declared grasp, counts unintended activations and handles one signal fault. Heavier, sharp and everyday objects remain outside the demonstrated capability.
1 · Permission and limits
Know exactly what you may do
2 · Get ready
Gather what you need and check the starting conditions
What you need
- Declared Prosthetic control fixture: A myoelectric training hand moves an empty foam cup from one marked pad to another on a table. The prosthetist controls fit, thresholds and permissible repetitions.
- Setup aid for Inspect fit and skin: Use only the configured device, empty foam object, clear table and approved stop procedure.
- Prosthetic control log: Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation; retain Prosthetic control errors, assistance, stop and fallback.
- Prosthetic-control provider sheet: from “Self-Contained Neuromusculoskeletal Arm Prostheses”, record interface, trained actions, device configuration and functional outcome; from the myoelectric robot-assisted training pilot, record participants, training condition, dose owner and measured change. Use the WHO/UNICEF report to keep the user goal, fallback and service support visible. Only the prosthetist sets fit and thresholds.
Before you start
- Obtain rehabilitation-team clearance and the device-specific training plan.
- Use only the configured device, empty foam object, clear table and approved stop procedure.
- Start check for Prosthetic control: Target, load, distance and stop state are exact.
- Top-of-sheet stop for Prosthetic control: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
3 · The method
Follow these steps in order
- Choose one functional action
The learner and team define “grasp the empty foam cup, move 20 cm and release on the blue pad,” plus the safe default.
Why: Target, load, distance and stop state are exact.
Check: Target, load, distance and stop state are exact.
- Inspect fit and skin
The prosthetist checks socket, electrodes, alignment, skin, comfort and device condition before activation.
Why: No new redness, wound, pressure or loose component is present.
Check: No new redness, wound, pressure or loose component is present.
- Record the rest signal
With the limb supported, relax for the provider-set interval while the clinician checks baseline noise and unintended movement.
Why: The device remains in the safe default during rest trials.
Check: The device remains in the safe default during rest trials.
- Calibrate one active command
Produce the agreed muscle signal while the provider sets and verifies the threshold; do not change settings independently.
Why: The intended open or close command occurs without a second function firing.
Check: The intended open or close command occurs without a second function firing.
- Rehearse without an object
Practise open, approach, close, hold and open at slow speed, returning to default between trials.
Why: The sequence completes three times without unintended activation.
Check: The sequence completes three times without unintended activation.
- Move the foam cup
Approach inside the marked zone, grasp with provider-approved force, move to the blue pad and fully release.
Why: Cup arrives upright and the hand returns to default.
Check: Cup arrives upright and the hand returns to default.
- Log error and comfort
Record success, drop, crush, unintended activation, correction, comfort and assistance for every trial.
Why: No error is hidden inside an overall success count.
Check: No error is hidden inside an overall success count.
- Test fallback and finish
On a staged signal fault, stop, support the device and use the team’s disable or removal procedure; inspect skin again.
Why: The learner demonstrates the stop response and the provider authorises the next step.
Check: The learner demonstrates the stop response and the provider authorises the next step.
4 · Worked example
See the whole method used once
Scenario
A myoelectric training hand moves an empty foam cup from one marked pad to another on a table. The prosthetist controls fit, thresholds and permissible repetitions.
Walkthrough
- The prosthetist checks intact skin, electrode contact and the empty foam-cup task.
- The learner completes rest calibration with no spontaneous hand movement, then learns one close signal.
- Three air rehearsals succeed; the fourth shows an unintended twitch, so the team reseats an electrode and recalibrates.
- The learner grasps the foam cup, moves it 20 cm and releases it upright twice with one verbal cue.
- During a staged signal fault, the learner supports the hand, stops the command and uses the approved disable control.
- Skin remains unchanged and the log shows two successes, one corrected activation and no drop; the clinician sets the next session.
Result
The learner completes the declared foam-cup task and demonstrates a safe response to one signal fault. It does not establish control of heavier, sharper or daily-life objects.
5 · Right and wrong
Compare correct or safer execution with the common wrong version
| Moment | Right / safer | Wrong / riskier | Why it matters |
|---|---|---|---|
| Fit check | Have the prosthetist inspect socket, skin and components. | Tighten, pad or reposition a clinical device independently. | Poor fit can injure skin and change control signals. |
| Rest calibration | Establish a quiet rest state before active commands. | Train through spontaneous movement or noisy electrodes. | Unstable baseline raises unintended activation; this distorts the myoelectric foam-cup task. |
| Task dose | Use an empty foam object and provider-set trials. | Add weight or repetition after one success. | Device control and tissue tolerance may not progress together. |
| Fault response | Return to safe default and use the approved disable procedure. | Fight an unintended movement while holding the object. | Continued command can worsen a drop, pinch or collision. |
6 · Common mistakes
Spot the error and apply the correction
| Mistake | Fix |
|---|---|
| Tighten, pad or reposition a clinical device independently. | Stop and have the clinical team adjust it. |
| Train through spontaneous movement or noisy electrodes. | Recheck contact and threshold with the provider. |
| Add weight or repetition after one success. | Change load only on the rehabilitation plan. |
| Fight an unintended movement while holding the object. | Set down, support and stop the device. |
7 · Practice
Turn the steps into a usable skill
First session
- Myoelectric intake block: the prosthetist names the configured training hand, socket, electrode pair, open/close command, 20-centimetre cup route and safe powered-down state. The learner does not alter fit, gain or threshold.
- Socket-and-skin gate: with power off, map pressure areas, confirm intact skin, seat each electrode at its marked contact and verify that the empty foam cup and blue landing pad are the only task objects.
- Quiet-signal block: support the limb, collect provider-timed rest windows and count baseline spikes or spontaneous closures. Any movement at rest returns the session to contact and threshold review.
- Command-and-air block: practise the exact open→approach→close→hold→open sequence three times without an object. Log missed closes, double functions and unintended twitches separately rather than calling the chain simply successful.
- Foam-cup and fault close: complete no more than the provider-approved cup trials, then stage signal loss or drift with no object held. Support the terminal device, disable it through the approved control, doff only with staff direction and recheck the socket skin map.
Repeat plan
At later prosthetist-led visits, repeat the same rest-window, single-command, air-sequence and empty-cup order before changing any goal. Progression depends on stable electrode contact, fewer unintended activations, unchanged skin and repeatable release—not on a single fast grasp or a heavier object.
Progress when
- Target, load, distance and stop state are exact.
- No new redness, wound, pressure or loose component is present.
- The device remains in the safe default during rest trials.
- Fit and skin remain acceptable, rest state is stable, the action succeeds at the planned assistance level, unintended activation does not rise and fallback is demonstrated.
Do not progress when
- Do not continue while this error remains: Tighten, pad or reposition a clinical device independently.
- Pause until this correction works: Recheck contact and threshold with the provider.
- This Prosthetic control stop ends the block: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
8 · Check the result
Measure what changed
Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation
How: Use one myoelectric row for each rest window, air sequence, foam-cup transfer and staged fault. Columns are socket/skin check, electrode contact, intended command, unintended second function, missed command, 20-centimetre transfer, drop or crush, cue level, comfort and post-doffing skin. A short device-on block cannot supply daily wear, abandonment or device-off participation; the rehabilitation team records those separately over time.
Good result: Fit and skin remain acceptable, rest state is stable, the action succeeds at the planned assistance level, unintended activation does not rise and fallback is demonstrated.
This does not prove: Boundary for Prosthetic control: “Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation” describes only A myoelectric training hand moves an empty foam cup from one marked pad to another on a table. The prosthetist controls fit, thresholds and permissible repetitions. It cannot establish “A bionic arm becomes a perfect natural limb”.
Self-check
- Before power-on, point out the socket landmarks, electrode contacts, intact skin areas and the powered-down default for this configured hand.
- During a quiet myoelectric rest window, what counts as baseline noise or spontaneous activation, and which finding sends the task back to recalibration?
- Explain why an upright foam-cup release does not authorise extra grip force, added weight, more repetitions or an unfamiliar object.
- If the hand closes without the intended muscle command, demonstrate support, set-down if needed, disable and prosthetist review in the correct order.
9 · Stop, adapt or get help
Keep the safety boundary practical
Stop and get help
- Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
- Stop for repeated unintended activation, loss of signal, unusual sound, battery warning or control drift.
- Do not alter clinical thresholds, components, load, wear time or task difficulty without the responsible team.
Accessibility and adaptations
- The team may change electrode site, socket, control mode, object size, table height or visual/audio feedback.
- Use a simulator, virtual task or therapist-supported limb before physical object handling when direct use is not yet appropriate.
10 · Evidence and limits
Why these instructions are here
- primary research
Registered support for Prosthetic control: “Self-Contained Neuromusculoskeletal Arm Prostheses”. It bears on Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation inside the Prosthetic control fixture. It does not validate “A bionic arm becomes a perfect natural limb”.
Self-Contained Neuromusculoskeletal Arm Prostheses - primary research
Constraint for Prosthetic control, drawn from “The efficacy of robot-assisted training for patients with upper limb amputations who use myoelectric prostheses: a randomized controlled pilot study”: One pilot kinematic measure did not improve, and a corrected implanted case series included sepsis and infection requiring explantation.
The efficacy of robot-assisted training for patients with upper limb amputations who use myoelectric prostheses: a randomized controlled pilot study - official guidance
WHO/UNICEF context for Prosthetic control: provision follows the user’s goal, “Choose one functional action”. Support and alternatives must precede reading Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation.
Global report on assistive technology
Limits
- Prosthetic control boundary: interpret “Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation” only for A myoelectric training hand moves an empty foam cup from one marked pad to another on a table. The prosthetist controls fit, thresholds and permissible repetitions.
- A successful result does not establish “A bionic arm becomes a perfect natural limb”.
- Prosthetic control limiting finding: One pilot kinematic measure did not improve, and a corrected implanted case series included sepsis and infection requiring explantation.
- No perfect-performance claim for Prosthetic control: the evidence register does not make “Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation” universal, consequence-free or flawless in A myoelectric training hand moves an empty foam cup from one marked pad to another on a table. The prosthetist controls fit, thresholds and permissible repetitions.
- Scope remains Prosthetic control: A myoelectric training hand moves an empty foam cup from one marked pad to another on a table. The prosthetist controls fit, thresholds and permissible repetitions. Recheck the comparator, support and “Task success, control error, comfort, wear time, abandonment, maintenance and device-on/off daily participation” after any configuration change.
Open the complete canonical research register
- Primary empirical supportLimiting / contrarySelf-Contained Neuromusculoskeletal Arm Prostheses
Max Ortiz-Catalan; Enzo Mastinu; Paolo Sassu; Oskar Aszmann; Rickard Brånemark · 2020 · Primary research
- Primary empirical supportLimiting / contraryThe efficacy of robot-assisted training for patients with upper limb amputations who use myoelectric prostheses: a randomized controlled pilot study
Tuğba Aydin; Fatma Nur Kesiktaş; Yusuf Doğan Akbulut; Mustafa Çorum; Kadriye Öneş; Taha Kizilkurt; Nazli Derya Buğdayci; Ilhan Karacan · 2022 · Primary research
- Limiting / contraryOfficial boundary contextGlobal report on assistive technology
World Health Organization; United Nations Children's Fund · 2022 · Official report
Read the complete evidence interpretation on the Power dossier.
Tutorial delivery controls
Learn, adapt, troubleshoot and resume
Progress is saved only in this browser on this device.
Step-by-step learner mode
Each activity includes its success check, a nearby accessible alternative and an “I’m stuck” correction path. Alternatives preserve the target where possible; when they change the task, Titan labels them as related rather than equivalent.
Choose one functional action
The learner and team define “grasp the empty foam cup, move 20 cm and release on the blue pad,” plus the safe default.
Target, load, distance and stop state are exact.
Target, load, distance and stop state are exact.
I’m stuck on this step
Reset: Re-read this authored instruction — “The learner and team define “grasp the empty foam cup, move 20 cm and release on the blue pad,” plus the safe default.” — and its success check, then attempt only this step.
Possible snag: The result from “The learner and team define “grasp the empty foam cup, move 20 cm and release on the blue pad,” plus the safe default.” does not yet meet this declared check: Target, load, distance and stop state are exact.
Correction: Return to the start of “Choose one functional action”, reduce complexity or pace, and repeat only the part needed to satisfy: “Target, load, distance and stop state are exact.”
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Inspect fit and skin
The prosthetist checks socket, electrodes, alignment, skin, comfort and device condition before activation.
No new redness, wound, pressure or loose component is present.
No new redness, wound, pressure or loose component is present.
I’m stuck on this step
Reset: Re-read this authored instruction — “The prosthetist checks socket, electrodes, alignment, skin, comfort and device condition before activation.” — and its success check, then attempt only this step.
Possible snag: The result from “The prosthetist checks socket, electrodes, alignment, skin, comfort and device condition before activation.” does not yet meet this declared check: No new redness, wound, pressure or loose component is present.
Correction: Return to the start of “Inspect fit and skin”, reduce complexity or pace, and repeat only the part needed to satisfy: “No new redness, wound, pressure or loose component is present.”
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Record the rest signal
With the limb supported, relax for the provider-set interval while the clinician checks baseline noise and unintended movement.
The device remains in the safe default during rest trials.
The device remains in the safe default during rest trials.
I’m stuck on this step
Reset: Re-read this authored instruction — “With the limb supported, relax for the provider-set interval while the clinician checks baseline noise and unintended movement.” — and its success check, then attempt only this step.
Possible snag: Train through spontaneous movement or noisy electrodes.
Correction: Recheck contact and threshold with the provider.
Possible snag: Fight an unintended movement while holding the object.
Correction: Set down, support and stop the device.
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Calibrate one active command
Produce the agreed muscle signal while the provider sets and verifies the threshold; do not change settings independently.
The intended open or close command occurs without a second function firing.
The intended open or close command occurs without a second function firing.
I’m stuck on this step
Reset: Re-read this authored instruction — “Produce the agreed muscle signal while the provider sets and verifies the threshold; do not change settings independently.” — and its success check, then attempt only this step.
Possible snag: Add weight or repetition after one success.
Correction: Change load only on the rehabilitation plan.
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Rehearse without an object
Practise open, approach, close, hold and open at slow speed, returning to default between trials.
The sequence completes three times without unintended activation.
The sequence completes three times without unintended activation.
I’m stuck on this step
Reset: Re-read this authored instruction — “Practise open, approach, close, hold and open at slow speed, returning to default between trials.” — and its success check, then attempt only this step.
Possible snag: The result from “Practise open, approach, close, hold and open at slow speed, returning to default between trials.” does not yet meet this declared check: The sequence completes three times without unintended activation.
Correction: Return to the start of “Rehearse without an object”, reduce complexity or pace, and repeat only the part needed to satisfy: “The sequence completes three times without unintended activation.”
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Move the foam cup
Approach inside the marked zone, grasp with provider-approved force, move to the blue pad and fully release.
Cup arrives upright and the hand returns to default.
Cup arrives upright and the hand returns to default.
I’m stuck on this step
Reset: Re-read this authored instruction — “Approach inside the marked zone, grasp with provider-approved force, move to the blue pad and fully release.” — and its success check, then attempt only this step.
Possible snag: The result from “Approach inside the marked zone, grasp with provider-approved force, move to the blue pad and fully release.” does not yet meet this declared check: Cup arrives upright and the hand returns to default.
Correction: Return to the start of “Move the foam cup”, reduce complexity or pace, and repeat only the part needed to satisfy: “Cup arrives upright and the hand returns to default.”
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Log error and comfort
Record success, drop, crush, unintended activation, correction, comfort and assistance for every trial.
No error is hidden inside an overall success count.
No error is hidden inside an overall success count.
I’m stuck on this step
Reset: Re-read this authored instruction — “Record success, drop, crush, unintended activation, correction, comfort and assistance for every trial.” — and its success check, then attempt only this step.
Possible snag: The result from “Record success, drop, crush, unintended activation, correction, comfort and assistance for every trial.” does not yet meet this declared check: No error is hidden inside an overall success count.
Correction: Return to the start of “Log error and comfort”, reduce complexity or pace, and repeat only the part needed to satisfy: “No error is hidden inside an overall success count.”
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Test fallback and finish
On a staged signal fault, stop, support the device and use the team’s disable or removal procedure; inspect skin again.
The learner demonstrates the stop response and the provider authorises the next step.
The learner demonstrates the stop response and the provider authorises the next step.
I’m stuck on this step
Reset: Re-read this authored instruction — “On a staged signal fault, stop, support the device and use the team’s disable or removal procedure; inspect skin again.” — and its success check, then attempt only this step.
Possible snag: Tighten, pad or reposition a clinical device independently.
Correction: Stop and have the clinical team adjust it.
Stop / get help: Stop for skin redness that persists, wound, swelling, pain, heat, odour, loose hardware or new discomfort.
Correct versus incorrect execution
These accessible process diagrams are built from the tutorial’s own right/wrong teaching. They are not anatomical illustrations and do not add technique beyond the canonical tutorial.
Have the prosthetist inspect socket, skin and components.
Tighten, pad or reposition a clinical device independently.
Establish a quiet rest state before active commands.
Train through spontaneous movement or noisy electrodes.
Use an empty foam object and provider-set trials.
Add weight or repetition after one success.
Return to safe default and use the approved disable procedure.
Fight an unintended movement while holding the object.
Method-structure checklist
10 of 10 structural checks present
- Ordered, Power-specific instructions — present
- Every activity has a success check — present
- Materials or supplied records are declared — present
- Measurement or assessment rule is present — present
- Tutorial-specific troubleshooting is present — present
- Stopping or escalation boundary is present — present
- Every activity has an adjacent alternative — present
- Correct-versus-incorrect comparison is present — present
- Evidence context is bound to the Power record — present
- Planning metadata is present — present
The method-readiness band and presence checklist assess tutorial presentation and are separate from evidence quality for the underlying Power. They are automated editorial aids, not human approval.
Manual editorial sign-off: Pending. This tutorial must not display a human-approved state until an identified editor signs the exact content hash.