Temporary Carotid Filter for Embolic Protection
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Solution Overview
Problem
Patients with tandem occlusions are at risk of additional strokes due to plaque dislodgement or thrombus formation at the carotid lesion after thrombectomy, as they cannot immediately receive antiplatelet therapy to prevent stent implantation, which increases the risk of hemorrhage.
Innovation Solution
Deployment of a temporary carotid filter downstream of the untreated occlusion to capture embolic masses, which can be maintained during the patient's recovery period until a stent is implanted, reducing the risk of further embolic events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent is implanted to treat the carotid lesion, then the carotid artery is stabilized and future embolic events are prevented, but the patient requires antiplatelet therapy which increases the risk of hemorrhaging in acute stroke patients
Solution Approach 1:
The patent introduces a temporary carotid filter as an intermediary device between the carotid lesion and the brain. This filter captures embolic material before it reaches the brain, allowing the patient to receive antiplatelet therapy for stent treatment without the increased hemorrhage risk, as the filter provides mechanical protection against emboli
Solution Approach 2:
The temporary carotid filter is deployed before stent implantation and antiplatelet therapy administration. This preliminary protective measure ensures that any embolic material dislodged during stent deployment or from the lesion is captured, preventing stroke while the patient receives necessary antiplatelet therapy
2Ease of manufacture
If antiplatelet therapy is administered to enable stent implantation, then the carotid lesion can be treated, but the patient's risk of hemorrhaging increases during the acute stroke recovery period
Solution Approach 1:
The temporary carotid filter serves as a protective intermediary that allows antiplatelet therapy to be administered safely. By mechanically capturing embolic material, the filter compensates for the increased bleeding risk associated with antiplatelet therapy, enabling carotid lesion treatment during the acute stroke recovery period
3Object-affected harmful factors
If the patient waits 24 hours to stabilize before treating the carotid lesion, then hemorrhage risk is reduced, but the patient remains vulnerable to additional strokes from plaque dislodgement or thrombus formation during the interim period
Solution Approach 1:
The temporary carotid filter acts as a protective intermediary deployed immediately after thrombectomy, before the 24-hour stabilization period. It captures any embolic material that may be dislodged from the carotid lesion during this vulnerable interim period, preventing additional strokes while the patient stabilizes
Solution Approach 2:
The filter is deployed as a preliminary protective measure before the carotid lesion is treated. This early deployment ensures continuous protection against embolic events during the entire stabilization period, addressing the vulnerability window that exists between thrombectomy and carotid lesion treatment
Data Source
AI summary
Shortly after completing a thrombectomy procedure, a temporary carotid filter can be deployed downstream of an occlusion not treated by the thrombectomy (e.g. a carotid lesion having plaque buildup), and the temporary carotid filter can remain in place during the patient's recovery period following the ischemic stroke until a procedure to treat the remaining occlusion is completed and antiplatelet therapy is administered. The temporary carotid filter can anchor in place while deployed with or without being tethered to a wire extending through the patient's Femoral Artery.