System

The {{entity:Surgical Robot System}} ({{hex:D4ED3019}}) first-pass decomposition is now complete. This session closed the final four coverage gaps identified in the previous session’s target: {{entity:Haptic Feedback Subsystem}}, {{entity:Power Management Subsystem}}, {{entity:Surgical Instrument System}}, and {{entity:Safety and Interlock Subsystem}}. Three additional subsystems received missing component assignments: {{entity:Surgeon Input Console}}, {{entity:Energy Delivery System}}, and remaining components of the infrastructure layer. The project now stands at 323 requirements across 6 documents, 287 trace links, 9 diagrams, and 0 orphan requirements.

Decomposition

This session added 58 new PART_OF relationships, raising the total to 78 facts across 13 parent subsystems. Prior sessions had fully covered {{entity:Motion Control and Scaling Subsystem}} (7 components) and {{entity:Vision and Imaging Subsystem}} (6 components). The four target subsystems now resolved are:

Haptic Feedback Subsystem — {{hex:55F57018}}: four-component force feedback chain from tissue sensing to surgeon actuator.

flowchart TB
  n0["Force Sensing Module"]
  n1["Force Signal Conditioner"]
  n2["Haptic Controller"]
  n3["Master Handle Actuator"]
  n0 -->|strain gauge signals| n1
  n1 -->|SPI 16-bit force data| n2
  n2 -->|CAN FD torque setpoints| n3

Safety and Interlock Subsystem — {{hex:50B53A18}}: five components with centralised {{entity:Safe State Manager}} authority receiving trips from all fault domains.

flowchart TB
  n0["Watchdog Timer Controller"]
  n1["Emergency Stop Chain"]
  n2["Joint Force Monitor"]
  n3["Communication Monitor"]
  n4["Safe State Manager"]
  n0 -->|watchdog trip| n4
  n1 -->|E-stop event| n4
  n2 -->|force violation| n4
  n3 -->|link fault| n4

Power Management Subsystem — {{hex:54F53018}}: {{entity:Main Power Distribution Unit}}, {{entity:UPS Battery Module}}, {{entity:Power Sequencing Controller}}, and {{entity:Auxiliary Power Supply}}.

Surgical Instrument System — {{hex:D6FD3059}}: six components covering the complete instrument chain from sterile coupling through cable actuation to lifecycle tracking.

Analysis

Lint produced 112 findings (3 high, 20 medium, 89 low). All three HIGH findings affect a single requirement ({{sub:SUB-MAIN-086}}, the {{entity:Real-Time Compute Node}} thermal management requirement) where abbreviated concept names — “procedure data recorder”, “motion control”, “time compute node” — classify without the {{trait:Physical Object}} trait. The full named entities ({{hex:50851208}}, {{hex:51F73A18}}, {{hex:50A50208}}) carry correct physical traits; the mismatch is an artifact of lint using short noun phrases rather than canonical entity names. Acknowledged as ontologically correct.

The UHT trait profile for {{entity:Haptic Feedback Subsystem}} ({{hex:55F57018}}) — Powered, Observable, Active, System-Essential — confirms the safety criticality. The {{entity:Force Signal Conditioner}} ({{hex:D4A51018}}) carries an isolation boundary role also reflected in the architecture decision {{arc:ARC-MAIN-014}}: the galvanic break between patient-side strain gauge signals and surgeon-side actuators is the primary patient safety measure for the haptic path.

The 36 null-document requirements (REQ-SESURGICALROBOT-*) are verification entries created in earlier sessions without the --document verification-plan flag. They represent valid test procedures and are fully traced; the only deficiency is the non-standard ref prefix. These require document reassignment in QC.

Requirements

The project’s 323 requirements include: {{sys:SYS-MAIN-001}}–{{sys:SYS-MAIN-017}} (17 system), 96 subsystem, 46 interface, and 102 verification plan entries, plus 14 architecture decisions and 12 stakeholder requirements. Trace link density is 0.89 links per requirement (287 links / 323 reqs). Zero orphan requirements.

Critical requirements confirmed in scope: {{sub:SUB-MAIN-093}} (SIL3 for the Safety and Interlock Subsystem), {{sub:SUB-MAIN-062}} (SIL2 for {{entity:Haptic Controller}}), {{sub:SUB-MAIN-065}} (IEC 60601-1 for haptic), {{sub:SUB-MAIN-094}} (IEC 62304 Class C for motion control). The fault-domain isolation architecture (dedicated {{entity:Auxiliary Power Supply}} for safety circuits per {{arc:ARC-MAIN-008}}, galvanic isolation at Force Signal Conditioner per {{arc:ARC-MAIN-004}}) is reflected in interface requirements {{ifc:IFC-MAIN-029}} and {{ifc:IFC-MAIN-015}}.

Baseline BL-SESURGICALROBOT-021 created at DECOMP-2026-03-20.

Next

QC session needed to: (1) reassign the 36 REQ-SESURGICALROBOT-* requirements to the verification-plan document with correct section IDs; (2) address medium-severity lint findings on regulated components missing explicit compliance requirement cross-references; (3) verify trace coverage for {{sys:SYS-MAIN-001}} 1:1–10:1 scaling range derivation to subsystem level.