A CCI ligation sequence captured under McGill’s approved Animal Use Protocol and paired with a structured metadata description.

I. FOOTAGE

What to watch for: the consistency of capture conditions and procedural standardization. Both are what convert a surgical video into trainable ground truth.

Every clip in the corpus ships with a structured, machine-readable metadata block. Below is the descriptor for the footage above — the format a downstream training pipeline ingests.

II. DESCRIPTION

{

"metadata": {

"video_id": "CCI_LIGATION_V_005",

"version": "reference exemplar",

"intent": "Single-take ligation sequence prepared for surgical robotics and video annotation discussion",

"date_captured_ymd": "2026-05-01",

"date_annotated_ymd": "2026-05-04",

"video_resolution": "1920x1080",

"duration_sec": 60,

"frame_per_second": 30,

"video_capture_setup": "Canon EOS R8 with 100mm RF macro lens filmed overhead",

"annotation_author": "Ericksson (same person who performed the procedure)"

  },

"laboratory": {

"principal_investigator": "Dr. Cyril Adler",

"institution": "McGill University (Lehman building)",

"surgical_procedure": {

"name": "CCI(Chronic Constriction Injury) — modified Bennett protocol, 3 ligatures",

"date_performed_ymd": "2026-05-01",

    "anesthetic": "Isoflurane",

    "anesthetic_route": "Inhalation",

    "analgesic_1": "Carprofen solution",

    "analgesic_1_dose": "20 mg/kg every 24 hrs for 3 days post-operatively",

    "analgesic_1_route": "Subcutaneous",

    "analgesic_2": "Lidocaine/Bupivacaine combined solution",

    "analgesic_2_route": "Topical",

    "ethical_approval": {

      "animal_use_protocol": "Approved AUP — Protocol No. 4452",

      "oversight": "Comparative Medicine and Animal Resources Centre (CMARC) compliant"

    }

  },

  "cohort": {

    "cohort_id": "CCI_2026-05-01_C12",

    "size": 12,

    "surgical_format": "Serial surgeries (same operator, same day)",

    "this_animal_position": 2,

    "note": "Standard lab cohort size is 12 animals; occasionally 24 split across 2 consecutive days"

  },

  "animal_record": {

    "animal_id": "002",

    "species": "Mus musculus (mouse)",

    "strain": "CD-1",

    "sex": "Female",

    "age": "8 weeks-old",

    "pre_surgery_body_weight_g": 24.5

  },

  "experimental_surgeon": {

    "name": "Ericksson",

    "credentials": {

      "degree": "B.Sc. Biochemistry",

      "training": [

        {

          "program": "CMARC Laboratory Animal Biomethodology Workshop",

          "module": "Module 4 — Rodent Survival Surgery (Tips-only aseptic technique)",

          "handout_version": "Revised January 2026",

          "institution": "McGill University",

          "status": "Successfully completed"

        }

      ]

    }

  },

  "videoclip_phases": [

    {

      "phase_id": 1,

      "label": "retractor_positioning",

      "start_sec": 0.0,

      "end_sec": 13.3,

      "description": "Positioning of the self-retaining retractor to maintain surgical field exposure"

    },

    {

      "phase_id": 2,

      "label": "ligature_passage",

      "start_sec": 13.3,

      "end_sec": 29.3,

      "description": "Passage of the ligature thread underneath the sciatic nerve"

    },

    {

      "phase_id": 3,

      "label": "square_knot_tying",

      "start_sec": 29.3,

      "end_sec": 50.7,

      "description": "Tying of a square knot to secure the ligature around the sciatic nerve, executed as two throws"

    },

    {

      "phase_id": 4,

      "label": "ligature_trimming",

      "start_sec": 50.7,

      "end_sec": 60.0,

      "description": "Trimming of the ligation thread tails"

    }

  ],

  "videoclip_gesture_events": [

    {

      "timestamp_sec": 3.3,

      "gesture": "retractor_insertion",

      "instrument": "self_retaining_retractor",

      "tissue_target": "muscle_edges",

      "direction": "bilateral"

    },

    {

      "timestamp_sec": 9.3,

      "gesture": "retractor_spreading",

      "instrument": "self_retaining_retractor",

      "tissue_target": "surgical_field",

      "force_quality": "controlled_sustained"

    },

    {

      "timestamp_sec": 16.7,

      "gesture": "nerve_elevation",

      "instrument": "micro_forceps",

      "tissue_target": "sciatic_nerve_trunk",

      "force_quality": "gentle_lifting"

    },

    {

      "timestamp_sec": 22.4,

      "gesture": "thread_passage",

      "instrument": "curved_forceps_with_thread",

      "tissue_target": "sub-neural_space",

      "technique": "underpass"

    },

    {

      "timestamp_sec": 33.3,

      "gesture": "first_throw_tying",

      "instrument": "needle_holder_and_forceps",

      "tissue_target": "sciatic_nerve",

      "technique": "square_knot_first_throw"

    },

    {

      "timestamp_sec": 44.0,

      "gesture": "second_throw_tying",

      "instrument": "needle_holder_and_forceps",

      "tissue_target": "sciatic_nerve",

      "technique": "square_knot_second_throw"

    },

    {

      "timestamp_sec": 54.0,

      "gesture": "thread_trimming",

      "instrument": "micro_scissors",

      "tissue_target": "ligature_tails",

      "completeness": "tails_cut_short"

    }

  ]