Pressure-Controlled Cranial Cap for Post-Craniectomy Flap Support
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Solution Overview
Problem
Patients who have undergone craniectomy but have not yet undergone cranioplasty experience neurological deterioration due to excess intracranial depressurization, leading to conditions such as motor and cognitive deficits, known as Syndrome of the Trephined (SoT), which is exacerbated by changes in posture and movement.
Innovation Solution
A cranial cap system with a pressure-controllable cavity and sensors that monitor skin flap deformation, using actuators and pumps to apply negative pressure to counteract excess flap depression, adjusting to patient posture and movement to maintain optimal skin flap position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a craniectomy is performed to treat intracranial hypertension and allow brain swelling, then intracranial pressure is relieved and brain tissue damage is prevented, but the patient develops Syndrome of the Trephined (SoT) due to excess intracranial depressurization, leading to neurological deterioration
Solution Approach 1:
The system applies positive pressure to the intracranial cavity in advance or concurrently with craniectomy to counteract the harmful depressurization effect before it can cause neurological deterioration. This preliminary anti-action prevents the development of Syndrome of the Trephined while maintaining the benefits of intracranial pressure relief.
Solution Approach 2:
The system dynamically adjusts the pressure parameter within the intracranial cavity to maintain it within a therapeutic range. By changing the pressure from negative (depressurization) to controlled positive pressure, the system prevents neurological deterioration while allowing brain swelling.
2Strength
If cranioplasty is delayed until swelling subsides (several weeks to two months), then brain tissue damage is avoided and surgery safety is improved, but the patient remains vulnerable to SoT and neurological deterioration during the extended period
Solution Approach 1:
The system implements preliminary protective action by applying positive pressure support during the entire delayed cranioplasty period. This preliminary action maintains neurological function stability throughout the waiting period when the skull is open, preventing SoT development until cranioplasty can be performed.
3Stress or pressure
If the skull bone flap is removed to allow brain expansion, then intracranial hypertension is treated and brain swelling is managed, but the skin flap becomes unsupported and sags, causing discomfort and potential complications
Solution Approach 1:
The system applies positive pressure as a counterbalancing force to support the skin flap from beneath. This counterweight effect opposes the downward sagging force of gravity and atmospheric pressure, maintaining skin flap position and patient comfort during the craniectomy period.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces and prevents the occurrence of SoT by maintaining a stable skin flap position, improving rehabilitation continuity and patient comfort by minimizing neurological deterioration.
Implementation Method 1
controlling, based on the received sensor output, a pump that is operably coupled with the cranial cap for maintaining a present skin flap shape or for reducing a skin flap depression
Data Source
AI summary
Embodiments pertain to a cranial cap, adapted for covering, at least partially or fully, a skin flap of a patient's head having undergone a craniectomy, the cranial cap comprising: a cap body; a flexible sheet adaptable to adhere to the head; wherein the cap body and the flexible sheet are sealed to form a fluid-tight cavity; a tubing connector port for removably bringing a pump in fluid communication with the cavity such to enable controlling fluid pressure in the cavity; and at least one sensor adapted and disposed to sense at least one characteristic relating to a skin flap shape for responsively providing an output descriptive of or relating to the skin flap shape; and patient posture and/or patient movement.