System

The {{entity:Surgical Robot System}} ({{hex:D4ED3019}}) decomposition reached the final review gate after validation completed in a prior session. The project stands at 449 requirements across six documents, 415 trace links, and 11 internal architecture diagrams covering all nine major subsystems. This session assessed the decomposition as a coherent engineering artefact and issued the completion baseline {{stk:BL-SESURGICALROBOT-034}}.

Findings

Coherence is strong. The nine subsystems partition the robot cleanly: {{entity:Safety and Interlock Subsystem}} holds all E-stop and watchdog authority; {{entity:Motion Control System}} owns the full kinematic pipeline from tremor rejection through joint servo; {{entity:Haptic Feedback Subsystem}} provides force reflection with an independent {{entity:Backdrive Monitor}} ({{hex:50B73808}}) FPGA safety island; {{entity:Vision and Imaging System}}, {{entity:Surgical Instrument System}}, {{entity:Power Management Subsystem}}, {{entity:Energy Delivery System}}, {{entity:Surgeon Input Console}}, and {{entity:Communication and Data Management System}} each own clearly bounded functions with no cross-subsystem ownership conflicts.

Completeness holds across the trace chain. {{stk:STK-MAIN-002}} (no uncontrolled force or energy to patient) derives to {{sys:SYS-MAIN-002}} (single-point-fault detection → safe state ≤150ms) which traces to {{sub:SUB-MAIN-001}} through {{sub:SUB-MAIN-005}} (SIS fault detection and E-stop chain requirements) and on to {{ifc:IFC-MAIN-002}} (E-stop chain to power management interface) and matching verification entries. That chain is intact and non-mechanical. The same depth holds for the motion scaling and haptics chains.

Plausibility is high for a SIL 3 teleoperated surgical system. The 1kHz control loop, 6Hz tremor filter (40dB attenuation), 0.1° joint tracking, and 150ms E-stop response all match the operating envelope of da Vinci-class robots. IEC 80601-2-77:2021 cited for the {{entity:Workspace Safety Enforcer}} ({{hex:51B73818}}) is the correct standard. HMAC-SHA-256 on command interfaces ({{sys:SYS-MAIN-018}}) and SIL 3 for the {{entity:interlock subsystem}} ({{hex:40A51010}}) reflect credible medical device practice.

Diagram coverage: All nine subsystems have internal architecture diagrams. The Motion Control System has a second diagram for the infrastructure layer ({{entity:Real-Time Protocol Engine}}, inter-cart fibre link). The motion control pipeline is:

flowchart TB
  n6(["Surgeon Console"])
  n0["Tremor Rejection Filter"]
  n1["Motion Scaling Module"]
  n8["Trajectory Generator"]
  n2["Kinematics Engine"]
  n3["Workspace Safety Enforcer"]
  n4["Joint Servo Controller"]
  n5["Real-Time Compute Node"]
  n7["Patient-Side Cart"]
  n6 -->|6-DOF vel cmds 1kHz| n0
  n0 -->|filtered vel 1kHz| n1
  n1 -->|scaled velocity 1kHz| n8
  n8 -->|Cartesian poses 1kHz| n2
  n2 -->|joint setpoints| n3
  n3 -->|validated cmds| n4
  n4 -->|CAN-FD 5Mbps| n7
  n3 -->|fault signal| n5
  n5 -->|heartbeat 200Hz| n0

Proportionality: The Safety and Interlock Subsystem and Motion Control System carry the most requirements and the deepest component decomposition, consistent with their SIL 3 classification and tight real-time constraints. The Power Management and Surgeon Console subsystems are appropriately lighter. One proportionality anomaly: 100 requirements carry null document assignment (REQ-SESURGICALROBOT-*). These are structurally floating but content-complete — all have rationale and verification. They represent verification activities and late-stage compliance requirements added without section assignment. The content is legitimate; only the document association is missing.

Corrections

• {{ifc:VER-MAIN-073}} (tagged duplicate-of-VER-MAIN-074, identical joint force monitor torque injection test) deleted. {{ifc:VER-MAIN-074}} confirmed present and retains all trace links.
• {{ifc:VER-MAIN-126}} (EMC compliance verification per CISPR 11 and IEC 61000-4-3) was the sole orphan; a verifies trace from {{sys:SYS-MAIN-019}} (IEC 60601-1-2:2014 EMC compliance requirement) was created. Orphan count: 1 → 0.

Residual

The 100 floating requirements remain without document association — an AIRGen structural limitation from sessions that created requirements without a section target. The content is sound and all 100 carry trace links, so this is a cosmetic issue for the document view. The 6 high-severity lint findings (Physical Object trait absent on functional subsystem entities) are all previously acknowledged in the SE:surgical-robot namespace with engineering rationale; they reflect ontological classification behaviour, not defects. Acronym expansion findings (SIS, FPGA, CAN, RTOS, etc.) are domain-standard abbreviations acceptable in a technical engineering record at this level of specialisation.

Verdict

Pass. The {{entity:Surgical Robot System}} decomposition is coherent, complete to the level expected for a concept-phase through preliminary design record, and plausible for a SIL 3 teleoperated medical device. Baseline {{stk:BL-SESURGICALROBOT-034}} issued. Status set to complete. The system joins se-autonomous-vehicle, se-hospital-patient-monitoring, se-naval-cms, se-earth-observation-satellite, se-nuclear-rps, and twelve others in the completed corpus.