Extract SURGICAL PROCEDURES from this medical document. Return a JSON array or null.

Only extract actual operations/procedures that were PERFORMED — cutting, implanting, removing, scoping.
Do NOT extract diagnoses, conditions, or diseases here — those belong elsewhere.
Do NOT extract hospital admissions — those belong elsewhere.

Each entry:
- type: "inpatient", "outpatient", "endoscopic"
- value: (empty)
- summary: procedure + date, e.g. "VP-Shunt Implantation, Jul 2020"
- timestamp: "YYYY-MM-DD" if date mentioned
- data: {"procedure": "...", "surgeon": "...", "facility": "...", "details": "..."}

Extract each distinct procedure as a separate entry. Include technique details in data.

Document:
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