Laparoscopic Surgery Video

What it does

Laparoscopic Surgery Video reviews the recording of a laparoscopic operation after surgery. Cholecystectomy is one of the most common abdominal operations and the reference procedure for surgical-video analysis; the run reads it in full, and also gives the phase timeline of a laparoscopic hysterectomy.

For a cholecystectomy the result is a phase timeline with the duration of each phase, an assessment of the three Strasberg criteria of the critical view of safety with evidence frames, and the answer to the audit question: was the critical view achieved before the cystic structures were clipped? It also reports which instruments were in use and for how long, segments the hepatocystic-triangle anatomy, and lists key events such as bleeding, bile spillage and conversion.

Intended use

Documentation, quality and teaching: a structured record of the operation, an audit of safe-cholecystectomy practice across a department, and structured feedback for residents on their own cases. Smoke, blood and unusual anatomy are the hard frames of the read.

Who it is for

General and hepatobiliary surgeons, surgical residents and their trainers, and quality and patient-safety teams. Developers and researchers use the run to index surgical video libraries by phase and instrument.

Accepted input

• Video: the recorded laparoscopic feed as MP4, MOV or MKV (H.264/H.265), or DICOM Video Endoscopic Image.
• Length: a full operation of 30–120 minutes, or clips around the dissection of the hepatocystic triangle.
• Procedures: laparoscopic cholecystectomy for every section; laparoscopic hysterectomy for the phase timeline.

Requirements

Requirement	Why
The whole operation recorded	The phase timeline and durations need every phase
Dissection of the hepatocystic triangle in view before clipping	The CVS assessment is made on the frames before the first clip
Frame rate in the file	Phase durations and event times are reported in seconds

Optional context

The procedure and its setting (elective, or acute cholecystitis) can be passed in clinical_context.

The result

Section	Content
Surgical phases	Phase timeline with the start, end and duration of each phase
Critical view of safety	Each of the three Strasberg criteria per video segment, CVS achieved before clipping (yes or no) and evidence frames
Instruments	Tool presence per frame, tool segmentation and tracking, and usage time per instrument
Anatomy segmentation	Masks of gallbladder, cystic duct, cystic artery, liver and tools on key frames
Draft report	Opt-in (options.report): an English narrative that interprets the result for the reader (findings, impression, limitations); every number is checked against the findings

Standards

• Safety: Strasberg critical view of safety (three criteria) and the SAGES Safe Cholecystectomy programme.
• DICOM and FHIR: annotated clips as Video Endoscopic Image, key frames as VL Endoscopic Image with KOS selection, masks as Segmentation, durations and CVS results in SR TID 1500; FHIR R4 Procedure.

The three CVS criteria

Fat and fibrous tissue are removed from the hepatocystic triangle; the lower third of the gallbladder is separated from the liver bed; and exactly two structures, the cystic duct and the cystic artery, are seen entering the gallbladder.